US20060178600A1 - Blood analyzer and pricking device for use in blood analysis - Google Patents

Abstract

The invention relates to a blood analyzer (2) that comprises a device (6) for taking a blood sample, equipped with pricking elements (8, 114, 122, 232), and test means (10) for receiving a minimum amount of blood. Said test means (10) and the pricking elements (8, 114, 122, 232) are disposed on a support (50) which can be rotated with respect to the housing base (4) and can be inserted in the analyzer along with said support. The test means (10) and the pricking elements (8, 114, 122, 232) can be brought into working positions (32, 34) relative to the housing base that are different from one another by rotating the support (50).

Description

• This invention relates to a blood analyzer for determining an analyte such as fructosamine, lactate, cholesterol or in particular glucose on minimal quantities of blood taken from a user immediately prior to analysis, with a housing body, with a blood sampling device having a pricking element, with a test means for accommodating a minimum quantity of blood, with an analyzer device comprising an electronic analyzer and with a display device, together forming a complete system that can be handled as a single unit, whereby the housing body has a pricking position assigned to the working position of the pricking element for being applied to a skin surface of a user and having a charging position designed at another location in the housing body for charging a minimal quantity of blood escaping from the previously pricked skin surface to a test means, whereby a plurality of test means and pricking elements can be inserted into the device and can be brought into a working position for performing several measurement one after the other, whereby in positioning a pricking element in its working position the pricking element can be inserted into the skin surface of a user which is brought to the pricking position and blood escaping from the skin surface, can be charged to a test means by applying the skin surface to the charging position, said test means being in a working position of the test means.
• This invention thus relates to complete devices which are also known as “all-in-one” units. The test means may be designed, for example, in the form of a membrane which defines the measurement field and is wetted with the minimal quantity of blood sampled and comprises test reagents with the help of which the analysis is performed. The analysis device may operate optically, for example, preferably by reflectometry, or it may operate electrochemically.
• U.S. Pat. No. 5,971,941 A discloses a complete system in the sense described above whereby a cassette with unused test means in the form of strips is inserted into a basic unit and then a particular test strip can be brought into the proper working position by means of a slide. By means of a ram, a pricking element is pushed outward via a deployment device which forms a part of the blood sampling device in order to prick the surface of a user's skin, so that capillary blood can be obtained for analysis. The pricking elements are integrated into a test strip and thus are brought into position together with the test strip. Details of how the analysis is performed cannot be obtained from this publication, however. According to another embodiment described in this publication, a disposable cylindrical attachment or insertion is described, having a pricking element and a tablet-shaped test membrane with continuous opening for the pricking element. This attachment or insert is then inserted into a holding recess of a ram arrangement which forces the pricking element outward for taking the blood sample.
• According to one embodiment ofGerman Patent 198 19 407 A1, a plurality of test means in the form of strips with pricking elements integrated into them in a manner not described there can be inserted into an analyzer and brought successively thereafter into a working position. This publication does not contain any clear-cut reference to technical feasibility.
• U.S. Pat. No. 4,787,398 A describes a blood sugar meter with a basic unit having a ram arrangement for deflecting a pricking element and an analyzer device and a display device. For each measurement, a replaceable unit must be attached to the basic unit, said replaceable unit comprising a pricking element and a test means in the form of a test strip to be wetted with blood. This replaceable unit is discarded after each use.
• A blood analyzer known from European Patent 0 449 525 A1 also comprises an integrated blood sampling device with a pricking element. Before starting operation each time, however, a new pricking element must be manually inserted into the deployment device as part of the blood sampling device and then a test strip must be inserted into the device.
• U.S. Pat. No. 4,627,445 A discloses a blood sugar meter with an integrated blood sampling device. Here again however, a new replaceable unit comprising a pricking element and a test means must be mounted on a base plate and then dismantled for each measurement.
• U.S. Pat. No. 5,951,492 A is similar. According to this publication, a disposable unit comprises a capillary tube with a test strip provided on the end distal from the body to receive the minimal amount of blood to be taken. The capillary tube is designed with a pricking element on its distal end. Again a new disposable unit of the type described above must be installed before each measurement operation and removed after the measurement.
• In addition European Patents 0 877 250 A2, 0 949 506 A2 and 0 811 843 A2 disclose non-generic blood analyzers with which a plurality of test strips may be arranged on a rotating disk as a support for the test means, whereby the test means can be brought successfully into an operating position and can be pushed out of the housing body for wetting them with a minimal quantity of blood.
• U.S. Pat. Nos. 6,228,100 B1 and 4,794,926 disclose blood sampling and pricking devices with which a number of pricking elements are arranged on a support that is rotatable with respect to a housing body. According to U.S. Pat. No. 6,228,100 B1, the pricking elements are ejected radially by means of an ejector device and according to U.S. Pat. No. 4,794,926, the pricking elements are oriented in the axial direction and can be activated.
• Based on the related art cited above, describing an all-in-one complete device, the object of the present invention is to create a device that can be designed to be compact, i.e., saving space and can be regarded as user friendly. It should be possible to easily insert unused test means and pricking elements into the device and to remove the used one from the device.
• This object is achieved according to this invention with a blood analyzer of the type defined in the preamble by the fact that the test means and the pricking elements are arranged on a support that is rotatable with respect to the housing body and they can be inserted with it into the device and by rotating the support the test means and the pricking elements can be brought into different working positions with respect to the body of the housing.
• Thus according to this invention both the test means and the pricking means are arranged on a rotatable support and can thus be brought into their respective working positions by a rotating movement. When speaking above of the working positions of the test means and the pricking elements, this is understood to refer to the position or the rotational position of a test means and/or a pricking element with respect to the housing body in which it is used as intended. A pricking element is in the working position of the pricking elements when it can be moved out of this working position to execute a pricking procedure via the pricking position.
• A test means is in the working position of the test means when it can be wetted in this working position by a minimal amount of blood. When speaking above of the different working positions of the test means and the pricking elements, this is understood to mean that after pricking the skin surface in the pricking position of the device, a user releases the skin surface, i.e., usually the finger from the pricking position and applies it to the charging position to transfer a minimal amount of blood to a test means. For example, the working position of the pricking elements may be in a 3o'clock position and the working position of the test means may be in a 6 o'clock position. Various working positions of test means and pricking elements, however, can also be achieved in a single rotational position of the support by arranging the pricking elements radially, for example, and orienting the test means axially. The respective pricking position would then be provided radially on the housing body and the charging position would be provided axially on the housing body.
• The use of a rotating support makes it possible to implement a compact design of the housing body. Due to the fact that the used test means and pricking elements are brought out of the working position by rotation of their support, they automatically go in this way to a disposal position without having to provide any additional separate translatory process.
• It would also be conceivable and advantageous if the test means were arranged on the same support that is to be handled manually so that the pricking elements and test means can be removed, e.g., from a transfer package as a single unit that can be handled manually and can be inserted with a single operation into the analyzer.
• From the standpoint of simplified production of the test means and pricking elements, however, it has also proven advantageous if the support comprises a first support part for the test means and a second support part for the pricking elements which can be assembled to form a unit that can be handled manually, preferably assembling it at the factory so that this easily handled unit can be inserted as a whole into the device and then removed again after use. However, the separate production and provision of test means on a first support part and pricking elements on a second support part should also be included, these parts being insertable individually into the blood analyzer into their rotatable arrangement there although this requires two separate assembly operations by the user.
• If various support parts are provided for the test means and the pricking elements, then it proves to be advantageous that these two support parts are coupled together in a rotationally fixed manner so that it is sufficient if a single drive of one support part or the other is provided in the interior of the analyzer. Even if the support parts are assembled to form a single unit that can be handled easily, it would also be conceivable if two separate drive devices were provided in the analyzer, which may prove to be advantageous for some applications.
• According to a preferred embodiment of this invention, the support or the support parts or one of the support parts has a central recess within which is provided a drive device for the blood sampling device.
• The support or the support parts or one of the support parts is preferably designed in the form of a ring and is arranged so that it can rotate about the ring center in the sense of being rotatable.
• The drive for the support or the support parts can be implemented in any known manner, preferably in a compact design. Electric motor drive devices or manually operable mechanical drive devices which may be designed to be controlled by a lever or a slide have proven to be advantageous. Discrete rotational positions of the support or the support parts are preferably provided, and may be implemented either by catch means, stepping means or stop means or through a suitable design of the drive device.
• It has proven to be particularly advantageous and compact if the support or the support parts have a central recess which includes a driving means or a part of a driving means for rotating the support or the support part. This driving means is advantageously designed by internal gearing that meshes with another drive wheel.
• This invention includes embodiments of the blood analyzer in which the pricking elements are arranged on the support so that when in the working position, they execute a pricking movement in a radial direction with respect to the rotatability of the support as well as embodiments in which the pricking elements execute a pricking motion in the axial direction.
• The arrangement of the pricking elements on the support may be implemented in various ways. According to one advantageous embodiment, a particular element is arranged in a sleeve means forming a cylindrical space before execution of a pricking operation and is held by a plunger means that is movable therein. It has proven advantageous if in this case the pricking element forms a syringe part of the plunger means which is designed as an injection molded plastic part.
• It is obligatorily necessary for the pricking elements to be surrounded by a sterility barrier on the support before execution of a pricking operation, so the embodiment described above has proven advantageous because in this case the sterility barrier may be formed by the sleeve means and the plunger means which are then closed on all sides. To keep the sleeve means germproof on the side facing away from the plunger means, i.e., to seal it so that it is germ-free and sterile, it has proven advantageous if this end is covered by a sealed film in particular. To achieve a seal between the plunger means and a wall of the cylindrical space that meets requirements, another sealing means is provided there. There may also be a connection between the wall and the plunger means which is overcome in execution of the pricking operation. Furthermore, a sealing compound may also be used there or, for example, ring-shaped bulges and steps, shoulders or recesses which cooperate with these bulges may also be provided in the other parts.
• With regard to the manufacturing of the arrangement of the pricking elements on the support described here, it has proven to be advantageous if several sleeve means are joined together in a strip and the ends of the strips are joined together to form a circular shape. In this way, sleeve means can be produced in the form of endless strips, divided into sections and their ends joined to form a circular shape and thus to form a support or a support part. The sleeve means arranged in a strip may also be arranged only along a partial circle, however.
• According to another embodiment, the support may have several recesses with a pricking element arranged in each. In this embodiment it has proven advantageous if the pricking elements are arranged in the axial direction based on the rotatability of the support.
• It has also proven advantageous if one wall bordering the recess is designed to be deformable so that it can be deflected by a driving device of the blood sampling device together with the pricking element to execute the pricking operation. To increase deformability, zones of weakening may also be provided in the wall bordering the recess. It has also proven advantageous if the recess is designed essentially in the form of a trough or a half-shell.
• In this arrangement of the pricking elements on the support, it has also proven to be advantageous if the pricking elements are accommodated in a sterile environment before the execution of a pricking operation. In this case a sterility barrier can be formed advantageously by a film-like covering means that covers the recess. This cover can be removed directly before execution of the pricking operation or it may be designed to be very thin so that it can be pricked by the pricking element.
• According to another embodiment of the blood analyzer, the pricking elements have a detachable protective cap means on their free end before the execution of a pricking operation, said cap means preferably forming a sterility barrier and ensuring sterile conditions for the free end of the particular pricking element.
• In the execution of the pricking operation, the pricking element can puncture through the protective cap means. However, it would also be regarded as advantageous if the protective cap means could be released by the respective pricking element immediately before the execution of the pricking operation. This may be accomplished in an advantageous manner by slightly retracting the particular pricking element immediately before execution of the pricking operation by the fact that the protective cap means is prevented from moving together with the pricking element by a stop means or the like. It has proven advantageous if the particular protective cap means can be removed from the path of movement of the pricking element after being released from the particular pricking element so that it can be accommodated in a holding space. For example, the force of gravity or a spring means may be used for this purpose.
• The arrangement of the test means on the support may also be such that the test means is axially oriented with respect to the rotatability of the support or is radially oriented.
• The test means are preferably oriented axially, which means that the charging position for a skin surface usually of one finger of a user is oriented in the axial direction; if not capillary fluid paths are arranged between the charging position and the test means which is in its working position. With an alignment or orientation of the testing machines with its measurement field generally being planar or extending over an area, it has proven advantageous if the test means are provided on a disk-shaped support part, in particular a ring disk-shaped support part, the plane of which is oriented at a right angle to the axis of rotation of the support and preferably corresponds to a plane of the respective test means.
• According to another embodiment of this invention, it has proven advantageous if the charging position on the housing body is covered by a movable covering part when it is not needed and is releasable when an analysis is to be performed.
• In another embodiment of this inventive idea, it has proven to be advantageous if by moving the covering part in the direction of release of the charging position, a driving device of the blood sampling device can be activated, i.e., if a triggering pressure or a tension is thereby created or an electric motor driving means is driven. It has proven to be particularly advantageous if the driving device of the blood sampling device can be activated by applying tension to a spring means.
• According to a very particularly preferred embodiment of this invention it is proposed that the blood analyzer should have a manually movable adjusting element which is coupled to the driving device for the pricking element and to the rotatable support in such a way that when the adjusting element is moved, the driving device for the pricking element is activated and a rotational movement of the support is induced. This manually movable adjusting element may be, for example, in the form of a wheel, a sliding part or in a preferred manner it may also be formed by the covering part mentioned above. The coupling between the adjusting element and the driving device and/or the support may be designed in such a way that the activation of the driving device and the rotation of the support take place simultaneously. However, it would also be conceivable for these to take place in chronological succession. In particular, the coupling between the adjusting element and the driving device and/or the support could be designed so that the support is rotated during a first phase of movement in a first direction of adjustment and during a second phase of movement, which may be in the opposite direction from the first adjusting direction, for example, the driving device is activated.
• To achieve a stepwise further rotation of the support, it has proven advantageous if the adjusting element can be brought during a first phase of movement in a first direction of adjustment into a driving connection with the support and during a second phase of movement it can be brought into a position opposite the direction of adjustment, i.e., in the case of a reverse movement of the adjusting element into its starting position, it can be brought out of a driving connection. In this restoring movement of the adjusting element, it may also prove advantageous if the driving device for the pricking element is thereby resettable into a starting position or resting position.
• The coupling between the adjusting element and the support can be implemented in an advantageous manner via a gear drive. For example, a translatory movement or a swiveling movement can be converted to a rotational movement via toothed entraining means and the rotational movement can easily be used to drive the support. However, it would also be conceivable for the coupling between the adjusting element and the support to be implemented in some other way, e.g., by entraining means in the form of catch arrangements or the like.
• It has also proven to be advantageous if the drive device for the pricking element comprises a spring that can be put under tension and released suddenly, preferably in the form of a bending spring. To apply tension to this bending spring, the adjusting element may act on a receptacle for the bending spring in particular via a gear drive and can pivot this receptacle in the plane of bending of the bending spring and thereby attention to the driving device for the pricking element, i.e., activate it.
• It has proven to be especially advantageous if the bending spring can be brought into a stable position under tension beyond a dead point so that the driving device automatically remains in the activated state. It is then possible to eliminate the use of a releasable catch mechanism.
• According to another independent inventive idea, a deployment device for the driving device for the pricking element can also be operated by applying a skin surface to the pricking position. The triggering device may then be designed advantageously as a contact sensor or as a button that can be depressed.
• It may prove advantageous if the triggering device is provided in an ergonomically well operable location on the housing body, in particular on the side essentially opposite the pricking position. In another embodiment of this invention, a design in which the triggering device is provided in the pricking position and can be operated by applying the skin surface that is to be pricked. In this regard, an embodiment in which the triggering device has a recess for the passage of the pricking element for execution of the pricking process is preferred.
• In another embodiment of this invention it is proposed that a retraction mechanism should be provided which causes retraction of a respective pricking element directly following the pricking operation so that the skin surface of a user is pricked only briefly. Such a retraction mechanism could in the simplest case be implemented by a spring means which exerts a restoring force. Such a spring means could be designed in various ways. For example a pricking element might extend through a spiral or strip-shaped spring means so that in the execution of the pricking operation, this spring means is put under tension. However, it would also be conceivable for such a retraction mechanism to be implemented in the driving device of the blood sampling device, e.g., by a force guide or by a motorized back-and-forth movement of a driving means coupled to the pricking element. For example, if the pricking element is held on a plunger means, a retraction mechanism could also be formed by designing a spring means on the plunger element. However, the retraction mechanism could also be provided by the elastic dimensional stability of a deformable wall area which holds the pricking element directly.
• The blood analyzer according to this invention can be manufactured with an essentially circular disk-shaped housing body and/or a circular disk-shaped outside contour. Thus it could be designed in particular in the manner of a watch casing, in particular in the manner of wristwatch housing and in addition could include a time display device. At any rate, it has proven advantageous if the housing body can be worn on the wrist of a user by using a tape mounted in the housing.
• In addition, this invention relates to a pricking device for taking a minimal amount of blood from the human or animal body for the purpose of analysis. This pricking device may be designed in the form of an independent instrument or integrated into the blood analyzer described above to form a complete all-in-one instrument. The discussions and descriptions of the pricking device described below and its preferred features are thus regarded as essential to the invention either separately or in combination with the blood analyzer described above and/or in any combination with these features.
• This invention thus relates to a pricking device for use in taking a minimal amount of blood from a human or animal body for the purpose of analysis, comprising a housing body and a plurality of pricking elements, wherein the plurality of pricking elements is arranged in or on a support and can be inserted into the housing body together with the support and can be removed from the housing body again after use, whereby a particular pricking element in a working position can be pricked with its pointed end into a skin surface of a user brought into the pricking position on the housing body, and this invention also comprises an ejector device which acts on the pricking element in its working position.
• Such a pricking device is known fromGerman Patent10057832 C1.
• Other pricking devices having a plurality of pricking elements are also known from U.S. patent 2002/0087056 A1 or WO 02/36010 A1.
• European Patent 0 589 186 B1 describes, for example, providing the ground tip of a pricking element with a safety cap means which is manually twisted off before executing the pricking process.
• According to WO 01/66010 A1, a plurality of pricking elements may be accommodated in independent compartments of a magazine, a respective opening in the compartment being sealed by an elastic material which can be punctured in the pricking operation.
• Based on a pricking device according toGerman Patent 100 57 832 C1 mentioned above, the object of the present invention is to improve upon the handling of the pricking element inside the housing body and to ensure effective protection of the free ends of the pricking elements without thereby making the execution of the ejection process too complicated or being associated with any great demand for space.
• This object is achieved according to this invention starting from a pricking device of the type defined in the preamble such that a particular pricking element is accommodated in a holding body in at least some areas and an end section of the pricking element which forms the pointed insertable end is surrounded by a detachable safety cap means; the longitudinal dimension of the respective element with the holding body and the safety cap means amounts to ≦15 mm in the pricking direction and the safety cap means can preferably be brought out of the path of movement of the pricking element by means of an internal displacement element before execution of the pricking process, preferably across the pricking direction.
• As indicated above, the pricking device may be integrated into a blood analyzer so that the following is also regarded as inventive: a blood analyzer for determining an analyte such as fructosamine, lactate, cholesterol or especially glucose on minimal amounts of blood taken from a user immediately prior to that, comprising a housing body, a blood sampling or pricking device having a pricking element and an ejector device for the pricking element, comprising a test means for receiving a minimal amount of blood, with an analyzer device comprising an electronic analyzer and with a display device forming a complete system that can be handled as a single instrument, whereby the housing body has a pricking position associated with the working position of the pricking element for bringing a skin surface of a user in contact with the pricking element and a charging position which is provided in particular on another location on the housing for charging a minimal amount of blood that is escaping from the previously pricked skin surface onto a test means, whereby a plurality of test means and pricking elements can be inserted into the device accordingly, the test means and pricking elements being suitable for performing several measurements in succession in a working position, whereby when a pricking element is positioned in its working position, the pricking element can be used to prick the skin surface of a user, said skin surface having been brought in contact with the pricking position, so that blood escaping from the skin surface can be charged to a test means by applying the skin surface to the charging position, which is in a working position of the test means, whereby the blood analyzer is further designed so that a respective pricking element is accommodated in at least some areas in a holding body and the end section of the pricking element forming the pointed insertable end is surrounded by a detachable safety cap means; the length dimension of the respective pricking element with the holding body and the safety cap amounts to ≦15 mm in the pricking direction, and the safety cap means can be brought out of the path of movement of the pricking element by means of a displacement element inside the device before execution of the pricking operation, preferably across the pricking direction.
• Due to the fact that a respective element is accommodated in a holding body which may be in particular a plastic injection molded part which is integrally molded onto the pricking element, an extensive miniaturization of the pricking element to a maximum dimension of 15 mm, in a preferred embodiment max. 14 mm and in particular max. 13 mm can be achieved, whereby the length dimension also includes the holding body and the safety cap means. The safety cap means inside the pricking device is removable from the path of movement of the pricking element immediately before the execution of the pricking operation. For example, the respective safety cap means could first be pulled away from the pricking element in the pricking direction so that it exposes the free end of the pricking element so that it can be brought to the side preferably across the pricking direction and can be brought to the side automatically by means of a displacement element to then be able to execute the pricking operation. It would also be conceivable for the respective safety cap means to remain initially in its position and for the pricking element to be retracted slightly in the direction opposite the direction of pricking so that the free end of the pricking element is released from the safety cap means.
• Although the safety cap means could be brought onto the free pointed end of the pricking element independently of the production of the holding body, in the mean time it has proven advantageous from the standpoint of manufacturing technology, especially in view of the desired miniaturization, if the safety cap means is also integrally molded on the pricking element, preferably in the same operation together with the holding body. In such a case, the safety cap means can show a transition to the holding body in one piece by way of a section which forms a weakened area or an intended breaking area. This simplifies handling of the pricking elements directly following their manufacture.
• Although the section forming the weakened area or the intended breaking area could be detachable by twisting off the safety cap means, but following the discussion above, it has proven more advantageous if the section forming the weakened area or intended breaking area can be broken in response to tensile stress in the longitudinal direction of the respective pricking element, i.e., in the pricking direction.
• To release the safety cap means, it could be removed by essentially any type of displacement means, e.g., in the form of a ram or sleeve, by first pulling it off the pricking element in the pricking direction or, as already mentioned, the pricking element could be moved backward in the direction opposite the pricking direction and thereby removed from the safety cap means. According to an especially preferred embodiment of this invention, the safety cap means is releasable from the pricking element in applying tension to the ejector device. Thus a movement to release the safety cap means is associated with applying tension to the ejector device. In particular, the pricking element is then retracted in the direction opposite the direction of pricking.
• According to another inventive idea, the holding body for the pricking element not only has a holding function for the pricking element but also has a guidance function in the execution of the ejection process. The outside shape of the holding body is complementary to that of the guide means, e.g., in the form of guide walls for slidingly displaceable arrangement of the pricking element.
• In another embodiment of the holding body, it has at least one position securing means, in particular in the form of a protruding web. Such a protruding web may keep the holding body and thus the pricking element in a position in the plane, for example, i.e., it may prevent rotation about the longitudinal axis of the pricking element, in particular during the ejection process, or the pricking element may slide out of the support when replacing a pricking element support.
• However, a particular holding body may also have a web that is elastically spreadable in the pricking procedure and can thus exert a retraction force on the pricking element, so that the holding body together with the pricking element is retracted again behind a contact face on the housing body.
• For the execution of the pricking procedure, it would be conceivable for the pricking device to have an ejector element which is under spring tension and strikes one end of the holding body and/or the respective pricking element in the pricking direction and moves it suddenly in the pricking direction. On the other hand, it has proven advantageous if the respective holding body has engagement means that cooperate with the pricking device. By means of these engagement means, a particular holding body can be coupled to the pricking device and in particular can be moved into an activated position with the tension applied to the pricking device. In this way, as mentioned above, the safety cap means can be released from the pricking element to release the safety cap means in this way, it is necessary for the safety cap means to strike against a stop means or to be otherwise held back. In an advantageous manner, the respective safety cap means is held in a form-fitting manner with respect to the support in the longitudinal direction of the pricking element so that it does not participate in this regard in a movement of the holding body together with the pricking element but instead is released from the holding body and the pricking element.
• It has also proven advantageous if the safety cap means is movable across the path of movement of the pricking element in a force-guided manner. This may be accomplished expediently by a complementary design of the support or components on the support and the safety cap means. It is pointed out explicitly that a concrete design of the safety cap means is not necessary for this purpose but instead there must always be a complementary design of the outside contour of the safety cap means and suitable receptacles, preferably in or on the support, so that immediately after the safety cap means is released from the pricking element and/or from the holding body of the pricking element, the safety cap means can be moved along this forced guidance out of the path of movement of the pricking element by means of the displacement element inside the device.
• To move the safety cap means reliably and rapidly, in particular out of the path of movement, it is preferably under an initial tension, in particular across the path of movement of the pricking element. The displacement element is advantageously directly or indirectly under a prestress against the safety cap means. To avoid a relative movement between the safety cap means and the displacement element, it has proven advantageous that a displacement element is permanently assigned to each safety cap means, i.e., even outside of the respective working physician.
• It should also be pointed out that for the design of the displacement element, no obligatory requirements need be made except that after displacement of the released safety cap means the path of movement for the pricking element must be released again. In particular in this regard, it has proven to be advantageous if the displacement element has a U-shaped strap in particular which moves the safety cap means out of the path of movement of the pricking element. Due to the strap-like design, the displacement element may continue to apply a load against the safety cap means even after the displacement operation so that the pricking element can move between the legs of the strap.
• It has proven to be especially advantageous that the support has disposal positions for a respective safety cap means such that the particular safety cap means can be accommodated in a manner in which it cannot be lost after being separated from the pricking element. It has proven to be especially advantageous that receptacle positions defined in this way, in particular receptacle cavities, are provided on the support and that the safety cap means can be removed from the housing body together with the support.
• According to another inventive idea, the particular safety cap means is accommodated in a clamped position in its disposal position so that it is accommodated there without causing any interfering noises. For example, it may be held under pretension of load against a wall of the support. It has proven to be particularly advantageous if the displacement element can be used for this purpose. To this end, it is advantageously designed such that it is in surface contact with the safety cap means, at least in the disposal position.
• With regard to a compact design of the device, it has proven advantageous that the safety cap means is under pretension on the free end of the pricking element in its starting position, and in its disposal position, it is under pretension by the same means in particular and preferably by the displacement element.
• The displacement element is preferably mounted on the support so that it can be inserted with the support into the housing body.
• In a preferred embodiment of this inventive idea, the displacement element is provided on the support in such a way that it holds the pricking element with their holding bodies and the safety cap means reliably so that they cannot be lost but at the lost time so that they are slidingly displaceable on the support. In such a case it has proven advantageous if the displacement element is designed as a spring element which is in contact with the safety cap means under a load. With a rotatable design of the support for the pricking elements, the displacement element may be designed as a spring ring having spring tongues protruding radially.
• Preferred embodiments of the ejector device are explained below. The ejector device may be a plunger means that can be put under tension or a ram means as an ejector element for executing the pricking operation. Although it is conceivable for the ejector element to strike the free end of the holding body or the pricking element to accelerate it suddenly, it has proven advantageous if an ejector element of the ejector device is already connected to the holding body even before the execution of the ejection process. For this reason, the ejector element has a coupling area which can be coupled to the holding body for the pricking element so that the ejector element and the pricking element are in entraining connection even before the execution of the ejection process, i.e., the ejector element together with the holding body can execute a tension movement.
• The form-fitting connection between the ejector element and the holding body and/or the pricking element can be achieved through any desired clamping means, catch straps or similar detachable connections. However, in another embodiment of this invention, the coupling area of the ejector element and the holding body can be coupled in such a way that the two can be moved in relation to one another across the pricking direction into a form-fitting entrainment connection. In such a case it is not necessary to use any flexible claws, catch means or clamping means. In particular in the case of a concentric rotatable arrangement with radially aligned pricking elements, the holding body and the coupling area of the ejector element can be rotated into the entrainment connection in the peripheral direction of the rotatable arrangement.
• To apply tension to the ejector element of the ejector device against a tension force, the ejector element has a tension cam which protrudes across the pricking direction. Again, any design of the ejector device would be conceivable for applying tension to the ejector element, but the tension cam described has proven to be advantageous inasmuch as it allows a displacement of the tension mechanism for the ejector element into a parallel plane. The tension cam may then be guided in an advantageous manner along a curved path of an adjustable or operable tension means. During this movement of the tension cam along the curved path, the ejector element which is force guided in a linear path is brought into an activated state in which it is under tension. The above mentioned curved path may advantageously be a cam path or a cam guidance path of essentially any desired implementation.
• It has also proven advantageous that after executing the movement in the tension direction, the tension means can be moved back under the control of a spring force. This may be, for example, a lever which is disk-shaped in particular and is mounted so that it can be pivoted or rotated, applying tension to a recoil spring with its movement in the tension direction. For example the tension means may include a lever which protrudes above the housing of the pricking device and can be deflected manually in the tension direction and returns automatically to the starting position when released again.
• In an embodiment of this invention which is especially important, the tension means for applying tension to or activating the ejector device is also an adjusting means to bring a particular pricking element into a working position and to bring a used pricking element into a disposal position. Thus in particular the support with the pricking elements may be advanced by one step, in particular by rotating it further. Instead of advancing the support, it would also be conceivable to advance the ejector device in relation to the support. According to the inventive idea explained above, one adjusting movement causes the ejector device to be activated and a new, as yet unused pricking element to be brought into the working position and/or the ejector device to be brought into the working position.
• The tension means, i.e., the tension mechanism may be designed and arranged in such a way that in a first phase of the movement, it is in a driving connection with the support for the pricking elements and in a second phase of the movement it is in a driving connection with the ejector element. In such a case the driving connection between the tension means and the support may be released at the end of the first movement phase by having the tension means or an arm of the tension means slide up against a ramp means. In this way it is possible to achieve the effect that despite operation by the same tension means, a new pricking element is brought into the working position first in the first phase by restoring the support and in particular is coupled to the ejector element and then in the second phase of the movement, the ejector element is moved in the tension direction, in particular together with the pricking element coupled to it.
• It has already been pointed out that the prinking device may contain additional components and in particular together with a plurality of test means, an analyzer device and a display device, it may form a blood analyzer which can be handled as a single device, also known as an all-in-one device.
• In such a case it has proven advantageous that the test means can also be brought one after the other into a working position in which the required minimal amount of blood can be applied to the particular test means from a previously pricked skin surface of a user. The test means may be for example membranes with test reagents contained in them with the help of which the analysis is performed optically or electrochemically or electrophysically in a known way which therefore need not be described in greater detail here. For example, in this way an analyte such as fructosamine, lactate, cholesterol or in particular glucose can be qualitatively and preferably also quantitatively determined in the minimal amount of blood just sampled.
• According to a preferred embodiment of this invention, the pricking elements and/or the test means are arranged concentrically with a point of rotation so that their respective working positions are rotatable. Therefore, a first support for the pricking elements and a separate second support for the test means are advantageously provided. However, these supports may also be combined to form one unit so that they can be inserted into the device and removed from the device as one easy-to-manage unit.
• With respect to extensive miniaturization of the device, it has proven to be especially advantageous if the pricking elements have a recessed circular segment with a radial arrangement on the support so that the support can be inserted into the housing body in such a way that the ejector device extends into this circular segment. Therefore due to the fact that no pricking element is provided in pie-shaped circular segment which may encompass in particular 100 to 200 in the circumferential direction, the ejector device may extend into the circular segment in the radial direction in this area. Therefore the insertion of the support with the pricking elements and optionally also with the test means into the housing body is not prevented by the ejector device. This also proves to be advantageous when-as described above-a particular pricking element and/or a holding body for a particular pricking element and an ejector element of the ejector device are rotated in relation to one another into a coupling connection.
• Additional details, features and advantages of this invention are derived from the patent claims and the attached drawings and the following description of a preferred embodiment of this invention. It should be pointed out that each feature claimed in the patent claims is considered essential to this invention, regardless of how the features are combined and regardless of their reference back to the claims, so that patent protection is also claimed for specific embodiments of the blood analyzer or the pricking elements, the support(s), the ejector device, the driving mechanism and adjusting mechanism for the pricking elements, regardless of the design of other components, in particular regardless of the design currently claimed for the blood analyzer according toclaim1.
• In the drawings:
• FIG. 1 shows a perspective view of an inventive blood analyzer;
• FIG. 2 shows a top view of the device according toFIG. 1;
• FIG. 3 shows an exploded diagram of an open housing body of the blood analyzer according to theFIG. 1;
• FIG. 4 shows an exploded diagram of a support with pricking elements and test means of the device according toFIG. 3;
• FIG. 5 shows a sectional view with a sectional plane indicated by the arrow A-A;
• FIG. 6 shows a sectional view with a sectional plane indicated by the arrow B-B;
• FIG. 7 shows a top view of the device according toFIG. 1 with a different type of display;
• FIGS. 8, 9 show another embodiment of the arrangement of pricking elements;
• FIGS. 10-13 show another embodiment of the arrangement of pricking elements;
• FIG. 14 shows an example of a driving mechanism for the arrangement inFIGS. 10-13;
• FIGS. 15, 16 show another embodiment of the arrangement of pricking elements with safety cap means;
• FIG. 17 shows the removal of the safety cap means from the pricking elements;
• FIG. 18 shows an activation and releasing procedure for the blood sampling device;
• FIGS. 19-21 shows an exploded diagram and a view from above and below of another embodiment of an arrangement of pricking elements;
• FIGS. 22-28 show an operation cycle of the blood sampling device using the arrangement of pricking elements according toFIGS. 19-21; and
• FIG. 29 shows another embodiment of the blood analyzer;
• FIGS. 30-32 shows an operating cycle of the blood sampling device in the embodiment according toFIG. 29;
• FIG. 33 shows a perspective view of a preferred embodiment of an inventive pricking device;
• FIG. 34 shows a perspective view into the interior of the pricking device according toFIG. 33 with the cover part omitted;
• FIGS. 35 and 36 show and exploded diagram of components illustrated in a housing body of the pricking device according toFIGS. 33 and 34;
• FIGS. 37 and 38 show a pricking element of the inventive pricking device;
• FIGS. 39athroughcshow the production process for a pricking element;
• FIG. 40 shows a perspective view of a support for the pricking elements;
• FIG. 41 shows a perspective view of a holding means for the pricking elements on the support which at the same time forms a displacement means for the safety cap means;
• FIGS. 42, 43 show a perspective view of the support with pricking elements before and after use;
• FIGS. 44 and 45 show a perspective view of the housing body of the pricking device;
• FIG. 46 shows a perspective view of the ejector element of the pricking device;
• FIG. 47 shows a perspective view of the triggering means of the pricking device;
• FIG. 48 shows a perspective view of the tension means of the pricking device and
• FIG. 49 shows a view of the pricking device from beneath with the lower covering part omitted.
• FIGS. 1 and 2 show a perspective view and a top view of an inventive blood analyzer which is labeled on the whole withreference number2. The blood analyzer is designed as a so-called complete device and includes ahousing body4, to be explained in greater detail below, which accommodates ablood sampling device6 having a plurality of prickingelements8 and a plurality of test means10.Unused pricking elements8 and test means10 are stored in magazines in thehousing body4 and are removed after use, whereupon they are discarded and/or disposed of. Theblood analyzer2 also includes ananalysis device12, which is only indicated here and has an electronic analyzer (not shown) and adisplay device14 in the form of a visually readable display for displaying the results of an analysis, i.e., in particular displaying the amount of an analyte, in particular the blood sugar content.
• Thehousing body4 of theblood analyzer2 according to this invention is designed in a circular disk shape in the manner of the casing of a wristwatch. It also includes opposing fastening means16 in the form of two alignedopenings18 to receive a strap of an essentially conventional wristwatch band.
• A prickingposition22 is formed on awall20 of thehousing body4 which is in the shape of a cylindrical section for coming in contact with a skin surface, in particular of a user's finger. The prickingposition22 is formed by a slidingpart24 which is movable in the circumferential direction with respect to thewall20 and has a through-opening26 in the form of an elongated hole extending in the circumferential direction such that apricking element8 can be pushed through the opening so that the skin surface of the user can be pricked to obtain a minimal amount of blood. By adjusting the sliding part22 [sic;24 above] in the circumferential direction, the depth of penetration of thepricking element8 can be adjusted. The prickingelement8 inFIG. 1 is depicted in its maximally ejected forward position, which the pricking element assumes only for an extremely brief period of time during the execution of the pricking operation. When theblood sampling device6 is not in operation, the prickingelement8 is inside thehousing body4.
• As shown byFIGS. 1 and 2, asegment28 of thehousing body4 having a convex shape as seen from above can be partially moved out of thehousing body4 so that thesegment28 exposes a chargingposition30 which is oriented axially with respect to the plane of the disk-shape housing body4. In this charging position30 a minimal amount of blood is charged to a test means10 which is situated directly beneath this charging position. When the test means10 is in the position shown inFIGS. 1 and 3, where it is associated with the chargingposition30 on thehousing body4, the test means being wettable with a minimal amount of blood in this position, then it is by definition in its working position. Similarly, the prickingelement8 shown inFIGS. 1 and 3 is in its working position which is provided for thepricking position22 in which it can prick the skin surface of a user in a manner to be described in greater detail below.
• Thesegment28 is held displaceably along a convexlycurved side36 facing inward by means of a slidingguide rail38 with an engagement place on the remaininghousing body4. When the blood analyzer is not in use, this segment can cover the chargingposition30 so that its other convexlycurved side42 which is provided with a groovedgripping surface40 forms a part of the cylindrical outside20 of thehousing body4.
• When a blood analysis is to be performed, the user slides thesegment28 into the position illustrated inFIG. 1 so that the chargingposition30 is exposed. At the same time, this movement activates theblood sampling device6 which is provided in the interior of thehousing body4 by applying tension to anejector mechanism44 which can be seen inFIG. 3 by mechanically applying tension to a spring. The user can then place a finger against the prickingposition22 and trigger theblood sampling device6 by operating abutton46. Then aram48 of theejector mechanism44 is pushed radially outward by the spring force as the spring is released. Theram48 then pushes the prickingelement6, which is in its workingposition34, outward in the radial direction so that it pricks the skin surface of a user through the through-opening26. The user then removes his finger from the prickingposition22, allows a minimal amount of blood to escape from his finger and then places his finger in the chargingposition30, thereby transferring a minimal amount of blood to the test means10 which is in its workingposition32. Then the analysis of the analyte begins and the result is displayed by the display device.
• FIGS. 4 through 6 give an example of an illustration of the arrangement of thepricking elements8 and the test means10 as well as theblood sampling device6 with itsejector mechanism44 in the interior of thehousing body4.FIG. 4 shows a perspective view of a support (labeled withreference number50 on the hole) for thepricking elements8 and test means10, whereby thesupport50 forms a type of magazine-like receptacle for prickingelements8 and test means10 and can be inserted as manually handleable unit into the device and can be removed again after use and disposed of as a whole together with the used pricking elements and test means.
• Thesupport50 as a fist support part52 in the form of an essentially planar ring disk54 for the test means10 and asecond support part56 in the form of a strip58 which is curved into a circular shape and has prickingelements8 held on it, arranged in radial direction.
• Thesecond support part56 is placed on another ring disk-shapedsupport part60 the plane of which extends parallel to the first support part52. Thesecond support part56 and thisadditional support part60 are coupled together in a rotationally fixed manner byrecesses62 on a part andintermeshing projections64 on the other part. Therecesses62 and theprojections64 may also cooperate in a frictionally engaged manner so that thesecond support part56 is permanently joined to theadditional support part60. The first support part52 can be clipped in a similar manner onto thesecond support part56 by the fact that form-fitting and/or preferably clampingrecesses62 andprojections66 between these two parts work together cooperatively.
• The test means10 are arranged inconcentric recesses68 provided on the first support part which are punched recesses or punched holes. They are arranged in such a way that they are accessible in the axial direction, i.e., in the direction of an axis ofrotation70 of thesupport50. In the case of each test means10, contacts69 are indicated on the top side of the first support part52, such that an electrode array (not shown) of the test means can be contacted and can be connected to the electronic analyzer. Thus in the present case, electrochemical test means are used; such means are adequately well known and therefore need not be described in greater detail here.
• The radially arranged prickingelements8 on thesecond support part56 each pass through aspring element74 which can be put under tension in the radial direction. Thepricking elements8 have a thickened head76 on the inside radially which cannot move due to thespring74. In ejection of thespring element74 in the radial direction, thespring element74 is therefore put under tension, therefore causing a radial retraction of thespring element74 essentially into the position shown inFIG. 4 within thehousing body4. Thespring elements74 therefore form retraction means78 for thepricking elements8.
• The threesupport parts52,56 and60 are designed in the form of a ring and have acentral recess80 in which theejector mechanism44 is accommodated, as shown inFIG. 3. Theadditional support part60 comprisesinternal gearing82 which cooperates with a driving wheel84 (seeFIG. 3). Thedriving wheel84 is drivable by an electric motor or by other means, e.g., by operating slide or by rotation of a manually operated wheel on the housing of the blood analyzer. Thesupport50 is rotatably mounted on acentral housing projection85 which engages in therecess80 as shown inFIG. 3. A planaraxial surface87 here forms an axial bearing surface against which the surface areas of theadditional support part60 which are directly connected to theinternal gearing82 are in sliding contact.
• In the sectional view according toFIG. 5, the plane of intersection passes through the workingposition32 of the test means10. A prickingelement8 can also be seen in the sectional view but it is not in the working position for pricking elements. The working position for pricking elements is included in the sectional plane according toFIG. 6, where the prickingelement8 is shown in the maximally ejected position. Theejector mechanism44 shown inFIG. 3 is not shown in the sectional view according toFIG. 6.FIGS. 3, 5 and6 show how thesupport50 can be inserted together with thepricking elements8 and the test means10 in the form of a cassette into the interior of thehousing body4 of the blood analyzer. Thehousing body4 is bordered at the bottom by a coveringpart86 and at the top by awall88 which runs across the axis ofrotation70. Above thiswall88 anotherroom90 is provided for theanalyzer device12 and its electronic components.
• FIG. 7 shows a stop view of a blood analyzer corresponding to that inFIG. 2; this blood analyzer differs from the one described above in that a time display device92 in the form of a conventional watch face is provided on the visible side of thehousing body4. However, this time display can also be in the form of an LCD display according toFIG. 2. In such a case, one could preferably select between a time display and an operating mode which displays the result of the blood analysis.
• Additional embodiments of the design of the blood sampling device are explained below. In a perspective view,FIG. 8 shows an arrangement of pricking elements within sleeve means100 which are arranged radially and on astrip102 which is curved into a closed circular shape as thesupport part104. Plunger means106 extend from radially inward into the sleeve means100, with the sleeve means100 forming a cylindrical receptacle. The plunger means106 carry the pricking elements (not shown inFIG. 8) which are then accommodated within the sleeve means100 in the radial direction. Twospring tongues108 in the form of webs included toward the radial direction are provided on the inside end radially of the plunger means106. When a particular plunger means106 is pushed radially outward in the direction of the arrow110, thespring tongues108 become deformed and exert a retraction force on the respective plunger means106 so that the latter is retracted at least slightly.
• The sleeve means100 have acover112 in the form of a film section on the outside radially such that the pricking element can either puncture through the film section or the film is partially or entirely removed immediately before executing the operation.
• FIG. 9 shows an enlarged detail fromFIG. 8. The plunger means106 with the prickingelement114 incorporated into it during the injection molding operation can be seen here. Between the insidecylindrical wall116 of the sleeve means100 and the plunger means106, a sealing means is provided in the form of aring bulge118 on thewall116 and aring bulge120 on the plunger means106. When the plunger means106 is ejected radially in the direction of thearrow100, thering bulge120 slides over thering bulge118 under the influence of thecylinder wall116. Before executing the pushing operating, the two ring bulges118 and120 form a seal for the cylinder space, so that the prickingelement114 is accommodated under sterile and sealed conditions. On the other side, the cylinder space is sealed by thefilm112.
• FIG. 10 shows another embodiment in which the pricking122 are accommodated inhemispherical wells124 in a disk-shapedsupport part126 and extend in the axial direction, i.e., parallel to the axis ofrotation70 of thesupport part126.
• FIGS. 11 and 12 show two perspective views of thesupport part126 according toFIG. 10.Gear teeth130 for rotating drive of thesupport part126 can be seen on the bottom side128. Instead of the gear teeth, however, a recess with internal gearing may also be provided.
• As shown by the detailed diagram inFIG. 13, the prickingelements122 are injected into trunk-shapedsupport sections132 which are designed in one piece with the material of the hemispherical walls133 which border thewells124. Thewells124 are covered with afilm134 at the top, then forming an airtight sealed space to receive therespective pricking element122. In addition, ring-shapedweakening grooves136 can be seen in the edge of thesupport part126 bordering thewells124.
• FIG. 14 illustrates the drive mechanism for the blood sampling device in the axial arrangement of the pricking122. For example, it is possible to use a pushing mechanism which acts radially with a radially movable pushingelement138, whereby the radial movement via a wedge-shapedslope140 can be used for axial deflection of the prickingelements122. Theslope140 slides with respect to the trunk-shapedsupport section132 which holds the prickingelement122 and deflects it in the axial direction, causing deformation of the trough shape, as depicted in four different stages inFIG. 14.
• FIGS. 15 and 16 show perspective and exploded diagrams, respective of another arrangement of the prickingelements140 as part of the blood sampling device on arotating support part142. The prickingelements140 are in turn arranged in a radial alignment and are injected with one end in a holdingram144 made of plastic. As with the plunger means according toFIG. 8,spring tongues146 are integrally molded on the holdingram144 and apply tension to the holdingram144 and thus the prickingelements140 with a radial movement, then causing the pricking elements to be retracted. Thesupport part142 has bearing projections that are integrally molded in one piece for accommodating and for radially displaceable support of the holding rams144 with the prickingelements140. The prickingelements140 injected into the holding rams144 are preferably completely surrounded by a safety cap means147 which forms a sterile environment and thus a sterility barrier for the prickingelements140.
• Aspring ring148 is preferably undetachably connected to thesupport142 from above by essentially any known joining means such that the holding rams144 are movable in the radial direction but are held so they cannot be lost. Aweb150 of thespring ring148 arranged above a respective safety cap means147 exerts a slight pressure in the axial direction on the safety cap means147. The ejector mechanism of the blood sampling device is designed in the present case so that immediately before execution of a pushing, i.e. pricking operation, the holdingram144 which is in the working position is pulled slightly toward the inside radially. In doing so, the safety cap means147 is initially held in its position by stop means so that therespective pricking element140 is released from the safety cap means147. The safety cap means is then moved into arecess152 in thesupport part144 under the action of theresilient web150 so that the safety cap means is brought out of the path of movement of thepricking element140. This process of retracting the holdingram144, releasing the safety cap means147 and bringing the safety cap means out of the path of movement of the pricking element is depicted inFIG. 17.
• FIG. 18 shows schematically the activation of the blood sampling device. On the whole an ejector mechanism isreference number48 comprising a ram-like ejector element154 which can be ejected in the radial direction and retracted again by means of a tension and compression spring156. Theejector mechanism44 can be put under tension by means of a rotatable adjusting means158 with aradially protruding cam160 by the fact that due to cooperation of thecam160 with a projection161 on theejector element154, the ejector element can be moved against the compressive force of the spring156 so that it is held in an activated state by acatch mechanism162 while retaining the spring tension. The adjusting means158 with thecam160 is spring-loaded to move it back into its starting position in particular. Then when the catch is released manually, theejector element154 snaps back suddenly in the radial direction under the influence of the spring force, whereby the free end of theejector element154 strikes the end of the pricking element or a holder carrying the pricking element and also pushes it the outside. Then theejector element154 is again moved into its starting position (shown inFIG. 18) by means of the spring156. The pricking element is then retracted back into the housing under the influence of the spring means described above.
• FIGS. 19 through 29 illustrate another preferred embodiment of the arrangement of pricking elements on a rotating support.
• FIG. 19 shows an exploded diagram of a pricking element cassette which is shown in the assembled condition from above inFIG. 20 and beneath inFIG. 21.
• It includes a support part with holdingrams172 that are arranged so they can move radially and have pricking elements each of which is covered by a safety cap means174, the arrangement here largely corresponding to that according toFIG. 15. It also has a ring-shaped spring means176 which cooperates with each safety cap means174 as described in conjunction withFIG. 17. The components described above can be used in anothersupport part178 with acylindrical wall area180 pulled upward. Thisadditional support part178 has areceptacle182 that forms a housing and protrudes into the interior for a ram-like or plunger-like ejector element184 which can be moved radially in the support part. Afirst driving spring188 is provided between oneend186 of theejector element184 on the inside radially and a wall of thereceptacle82 which forms the housing. A restoringspring192 is provided between a ring collar190 of theejector element184 and thereceptacle182.
• Theejector element184 also has on its circumference a holding means194, e.g., in the form of a ring groove by means of which theejector element184 can be held in thereceptacle182 when tension is applied to thespring188. This can be accomplished by a catch mechanism, which is formed in the present example by aclamping spring196 and cooperates with the holding means. Theejector element184 has an engagement means198 on its outer end radially to retract the holdingram172 in order to release the safety cap means174. The engagement means engages behind: an engageable section200 of the holdingram172. This engageable section may be formed by athickened end201 which is therefore also designed to accommodate a pushing force and is on the holdingram172.
• Acontrol lever202 which is designed to cover an area and can rotate about the axis ofrotation70 of thesupport part170 is provided on the outside of thesupport part178. Thecontrol lever202 comprises acam control surface204 which cooperates with a cam means206 of theejector element184 which extends in the axial direction through arecess208 in the bottom of thesupport part178. When thecontrol lever202 inFIG. 21 is pivoted clockwise, thecam control surface204 comes into operative contact with thecam206 and forces thecam206 and with it theejector element104 inward in the radial direction with further rotation of thecontrol lever202 so that the drivingspring188 is put under tension. Theejector element104 can be locked in the condition of thespring188 in which it is under tension by means of the holding mechanism or catch mechanism described above as an example, even when thecontrol lever202 is rotated back into the starting position shown inFIG. 21.
• In addition, thecontrol lever202 has an entraining means210 in the form of a catch lever212 which is elastic in the axial direction and by means of which thesupport part170 and thus the arrangement of the pricking elements can be rotated in the circumferential direction. To this end, the catch lever212 engages through a recess214 which extends in the peripheral direction in the bottom of thesupport part178 and grips thesupport part170. Therefore the support part advantageously has acrown catch arrangement216 which is merely indicated inFIG. 21.
• When thecontrol lever202 is rotated starting from the position illustrated inFIG. 21, the catch lever212 causes thesupport part170 to continue rotating so that a new pricking element that has yet been used is brought into its working position. In doing so, the respective holdingram172 with its engageable section200 slips into the engaged situation with the engagement means198 of theejector element184 as shown inFIG. 20. To simplify this positioning movement, it has proven to be especially advantageous if the engagement means198 is provided with a sloping approach or aninsertion slope218 as shown inFIG. 20 orFIG. 19. Positioning inaccuracies in the resting state of theejector element184 can be compensated by means of thisslope218 which is preferably designed on the inside radially and on the outside radially.
• To ensure that a particular pricking element is positioned exactly in the working position of the pricking elements and its not transported further inadvertently, atransport interruption device220 is provided exactly in this rotational position. Thistransport interruption device220 is designed for example and in an advantageous manner so that it causes an axial deflection of the catch lever212 so that its entrainment means210 can no longer cooperate with thecrown catch arrangement216. Therefore, the catch lever212 includes aradial projection222 which slides toward an outside of thesupport part178. This outside of thesupport part178 has aslope224 at an appropriate location which raise the catch lever in the axial direction in the sense described above when thecontrol lever202 reaches thisslope224 in its rotation. When thecontrol lever202 is rotated back, the entrainment means210 of the catch lever212 slides over the oblique flanks of the crown catch arrangement without causing thesupport part170 to rotate back however. To reliable prevent thesupport part170 from turning backwards, a reverse rotation prevention device226 is divided, this device being implemented in an advantageous manner through a suitably oriented crown catch gearing228 on the inside of thesupport part178, as illustrated for example inFIG. 19. The design and orientation of this crown catch arrangement228 are such that it cooperates with thecrown catch arrangement216 of thesecond support part170 so that thesupport part170 can be rotated in the direction of conveyance but not in the opposite direction. A slight axial deflectability of thesupport part170 with respect to theother support part178 is necessary for this. The reverse rotation preventing device226 could, however, also be implemented in another manner.
• FIGS. 22 through 29 show an operating cycle of the arrangement of pricking elements described above. Each figure shows at the left a view of the pricking element cassette from underneath and the right side of the figure shows a view of the cassette from above.
• FIG. 22 shows thecontrol lever202 in the starting condition where it is in contact with anend stop230. The right side ofFIG. 22 shows a holdingram172 with pricking elements and safety cap means174 emphasized in a position in front of the working position of the pricking elements.
• FIG. 23 illustrates a rotating movement of thecontrol lever202 clockwise whereby the entrainment means210 engages in thecrown catch arrangement216 on the bottom of thesupport part170 and likewise conveys, i.e., rotates thesupport part170 and the pricking elements arranged thereon in the clock direction, namely until the holdingram172 mentioned above has reached the working position, namely the position shown at the right inFIG. 23. The approaching slope orinsertion slope218 described above can be seen inFIG. 23 with the engagement means197 of the ejector element.
• When the control lever is turned further according toFIG. 24, theradial projection222 and thus the catch lever212 are deflected axially by sliding up against theslope224 in the axial direction, so that thesupport part170 cannot be rotated further. At the same time, thecam guidance face204 of thecontrol lever202 presses thecam206 and thus theejector element184 radially inward, putting tension on theejector spring188. Through the cooperation of the engagement means198 and the engageable section200 of the holdingram172, the latter is entrained radially inward, so that for the first time thepricking element232 which can be seen at the right inFIG. 24 is released from the safety cap means174.
• FIG. 25 shows the maximally rotated state of thecontrol lever202 and/or theejector element184 in that theejector element184 has been locked in the taut position via a holding mechanism which is formed mainly by the clampingspring196 and the ring groove on theejector element184. When thecontrol lever202 is pushed back according toFIG. 26, theejector element184 therefore remains in its taut position. The safety cap means174 is now brought by the axially acting spring means176 out of the path of movement of thepricking element232.
• Finally,FIG. 27 shows the pricking operation that is performed, whereby theejector element184 is snapped outward in the radial direction by operating the holding means in the form of spreading of theclamping spring196, so that the ejector element strikes the end of the holdingram172, pushing it outward together with the pricking232.
• At the next moment, the restoringspring192 causes a retracting movement of theejector element184 into the starting position shown inFIG. 28 in which the pricking element in the working position has been retracted into the housing.
• FIGS. 29 through 32 illustrate a preferred embodiment of the driving device, i.e., the ejector mechanism for a pricking element which is in its working position, these figures illustrate (independently of the arrangement and the design of the pricking elements on a rotating support) the activation, i.e., tensioning of the driving device for the pricking elements and further rotation of the support by means of asingle control element238 which is formed in an exemplary manner by the covering part mentioned previously. Details in this regard are given below.
• FIG. 29 shows a perspective view of the support component of this embodiment of the analyzer, omitting the components that form the housing. However, the coveringpart28 has an arrangement ofteeth240 like a toothed rack the inside36 in combination with the slidingguide rail38 illustrated inFIG. 2 on itsinside36. Theseteeth240 can be brought into engagement with the teeth of afirst gear wheel242 which can be rotated in the plane of movement of the coveringpart28. Thisfirst gear wheel242 is arranged in a rotationally fixed manner on ashaft244 which extends perpendicular to said plane and as on its other end asecond gear wheel246 on the output end. Thissecond gear wheel246 can be brought into and out of engagement withinternal gearing82 on a support part60 (the same reference notation as that used in FIGS.1 though6 has also been used here). Theshaft244 is movable in anelongated hole248 which extends in said plane of movement. When the coveringelement28 is pivoted in the direction of exposure of the charging position mentioned in conjunction withFIG. 1, theshaft244 is forced into the position shown inFIG. 29 at one end of theelongated hole248 where thesecond gear wheel246 meshes with theinternal gearing82 of thesupport part60 so that thesupport part60 and thus the arrangement of pricking elements are rotated further in the clockwise direction with rotation of the gear wheel and shaft arrangement. When the coveringpart28 is pushed or pivoted back into its starting position, the gear wheel and shaft arrangement is forced toward the opposite end of theelongated hole48, so that the teeth of thesecond gear wheel246 are disengaged with theinternal gearing82 of thesupport part60. This prevents the arrangement of prickingelements8 from rotating backwards.
• The driving device for a pricking element which is in the working position shall be referred to on the whole withreference number250 and comprises anejector mechanism44 with aram48 which acts on the respective pricking element. Thedriving device250, however, also includes a tension mechanism which is formed in the present case by thefirst gear wheel246 and abending spring252, and has a triggeringdevice254 comprising alever arrangement256.
• The bendingspring252 is attached at one end on abending spring receptacle258 on thesecond gear wheel246 and at the other hand on abending spring receptacle260 on acomponent262 which can be swiveled with respect to thehousing body4. Thisswivelable component262 is part of thelever arrangement256 which connects thiscomponent262 to apushbutton264 in thepricking position22 on thehousing body4.
• In the outward movement of the coveringpart28, thesecond gear wheel246 does not rotate just thesupport part60 further, but instead swivels the bendingspring receptacle258 and thereby puts the bendingspring252 in a taut state. By operating thepushbutton264, the other bendingspring receptacle260 is also pivoted by thelever arrangement56 so that the bendingspring252 is suddenly relaxed from its stable taut state in which it is under tension beyond a dead point, thereby causing theram48 to be pushed radially outward and this in turn causes the respective element to execute the pricking operation also by pushing it radially outward. This movement sequence is illustrated inFIGS. 30, 31 and32. These figures each show a view from above and below the components that are of interest here within the housing body.FIG. 30 shows thedriving device250 of the blood sampling device in an unactivated starting state. The bendingspring252 assumes a curved shape between the bendingspring receptacles258 and260. When the coveringpart28 is swiveled in the direction of exposing the chargingposition30, as shown inFIG. 31, thesupport part30 is also rotated via thegear wheel242, theshaft244 and thegear wheel248 as well as theinternal gearing82. At the same time the bendingspring receptacle258 on thesecond gearwheel246 moves counterclockwise in the diagram inFIG. 31aand thebending spring252 assumes an S-shape curve. Meanwhile, the bendingspring receptacle260 and the position of thepivotable component262 remain unchanged. Thedriving device250 and itsbending spring252 are now in a taut activated state. When a user activates the triggeringdevice254 by depressing thepushbutton264 to trigger the pricking process, thepivotable component262 is pivoted into the position illustrated inFIG. 32avia thelever arrangement256. This causes thebending spring252 to move over a dead point position and the spring energy stored in the spring which when it is under tension in an S shape is released suddenly when the spring assumes the curved shape again shown inFIG. 32abut with the opposite curvature from that in29a.By coupling thebending spring252 to theram48 of theejector mechanism244, the latter is also pushed outward suddenly,
• When minimal amounts of blood for applying to a test means of the blood analyzer were mentioned above, this was understood to refer to quantities of blood of <20 μL, in particular <10 μL and preferably <5 μL.
• FIGS. 33 and 34 show perspective views of a pricking device label on the whole withreference2′ for taking a sample of a minimal amount of blood from the human or animal body for analytical purposes. A coveringpart4′ which is shown inFIG. 33 and is hinge connected and swivelable has been omitted inFIG. 34. In the interior of thehousing body6′ can be seen a plurality of prickingelements8′ which are arranged concentrically and radially and will be described in greater detail below. At the center of the concentric arrangement can be seen anejector device10′ which defines a pushing direction or prickingdirection12′.
• FIGS. 35 and 36 show exploded diagrams illustrating the components that can be inserted into thehousing body6′. It can be seen here that thepricking elements8′ which are provided with a protective sheathing and are to be described in greater detail below (their radial arrangement is shown inFIG. 35) are slidably displaceable in the radial direction on asupport14′ in the form of a ring disk in guide paths or guiderecesses16′ provided for this purpose in thesupport14′.
• Above thepricking elements8′, aring disk18′ made of spring steel can be seen inFIG. 35, holding the pricking8′ in a manner which is to be described in greater detail below in the guide recesses16′ of thesupport8′ so that they cannot fall out but they are radially displaceable.
• Above thering disk18′ there is asecond support20′, illustrated with thecontact22′ which is indicated schematically for the test means24′ provided in the area of thecontact22′ for performing the blood analysis, i.e., for determining the presence and concentration of an analyte, e.g., blood sugar, lactate, cholesterol or fructosamine. It would be conceivable for these membrane-like test means24′ which are not shown in detail but are in particular like a membrane to be acted upon by the required minimum amount of blood through a charging opening in thecover part4′ of the pricking device. However, it would also be conceivable for an analytical test strip (not shown) to be output through a slot-shapedopening28′ and to be wetted with a minimal amount of blood. Then an analysis can be performed by amperometer or potentiometry via thecontact22′ and an analyzer device (not shown). Inclusion of separate analysis test strips would also be conceivable; these test strips could then be inserted through the slotted opening28′ to thecontact22′ on thesupport20′ which is thus not included in the interior of thehousing body6′ on thesupport20′. In a preferred embodiment, however, thesecond support20′ carries a number of test means24′ corresponding to the number of prickingelements8′.
• A display device having a display screen can be mounted on the visible side of the coveringpart4′ which faces upward inFIG. 33, e.g., in combination with the usual components of a wristwatch.
• FIG. 36 shows thehousing body6′ which has abottom plate32′ with anedge section34′ which protrudes upward cylindrically as well as a dome-shapedelevation36′ arranged in the center with acircular circumference38′ in some sections. A disk-shapedcomponent42′ which is provided with anoperating level40′ which protrudes radially upward is mounted so it can turn on the underside of thebottom plate32′. It is held by acover part44′ on the bottom side so it can rotate on the underside of thebottom plate32′ of thehousing body6′. This also shows a retraction means in the form of arecoil spring36′. The disk-shapedcomponent42′ forms a tension means48′ for theejector device10′.
• In the middle of the dome-shapedelevation36′, the ejector device labeled withreference number10′ on the whole is accommodated. It includes anejector element50′ which is to be described in greater detail below, an ejector spring52′ and a restoring spring54′, a triggering means56′ and a cover58′. Theejector device10′ can be activated by swiveling the operatinglever40′ and thus the disk-shapedcomponent42′ by applying tension to theejector element50′ against the pressure of the ejector spring52′. By operating the triggering means56′, theejector element50′ is ejected in the radial direction and executes a pricking operation together with apricking element8′, whereupon thepricking element8′ is briefly pushed forward over thecontact position60′ shown inFIGS. 33 and 34 and thereby pricks the skin surface by being pushed beyond theposition60′ of contact with the user's finger, as shown inFIG. 33 and34, so that immediately thereafter a user can force a minimal amount of blood out of the tip of his finger.
• The components mentioned briefly above will now be described in greater detail below in terms of design and function on the basis of individual diagrams:
• FIG. 37 shows a perspective diagram on a greatly enlarged scale of apricking element8′ with the enveloping sleeve also shown inFIGS. 34 and 35. This sleeve includes a holdingbody62′ made of plastic which is integrally molded on the actual needle-shapedpricking element8′ (frequently also referred to as a lancet) and a safety cap means64′ in the area of the pointed end65′ (seeFIG. 38b). In the ejection process, the prickingelement8′ is held through thefree opening66′ in the holdingbody62′ held in the injection mold. In one operation the holdingbody62′ and the safety cap means64′ are integrally molded. The holdingbody62′ and the safety cap means64′ show a transition into atransitional area68′ which has a thin wall and forms a weakenedarea70′. However, it should be pointed out explicitly that a design of these components that is not in one piece around the prickingelement8′ would also be conceivable by means of sliding parts or by successive production of the holdingbody62′ and the safety cap means64′. In addition, anopen area72′ can also be discerned in thetransitional area68′, thus promoting the development of the thin-walled weakened area75. Thisopen area72′ may be formed, for example, by another holding means for thepricking element8′ in the injection process.
• Aweb74′ which has a rounded free end76′ and is formed in one piece with the holdingbody62′ and stands away from it can also be discerned forming an oblique angle of approximately400 to the longitudinal direction of the pricking8′. Theweb74 is designed to be spreadable in the direction of thedouble arrow78′ or elastically deformable with respect to the cube-shaped holdingbody62′ for theelement8′. On the one hand it ensures a stabilization in the contact plane for the holdingbody62′ and prevent tilting about the longitudinal direction, for example. After executing a pushing operating, however, it may also initiate a retraction torque into the holding body and thus into the prickingelement8′, thereby retracting the latter again. It also secures the prickingelement8′ to prevent it from sliding out of the guide recesses16′ in thesupport14′.
• The safety cap means64′ has an H-shaped design when seen from above. It has guide recesses80′ on both sides with which it is held on thesupport14′ so that it cannot be displaced in the longitudinal direction of thepricking element8′, i.e., in the radial direction, but on the other hand, it can slide laterally, namely normal to the longitudinal direction of thepricking elements8′ with respect to the support.
• FIGS. 38a, bandcillustrate the dimensioning of the pricking element which is largely miniaturized with the holding body and the safety cap means. In its longitudinal direction it includes a length of only 12.5 mm, including the holdingbody62′ and the safety cap means64′.FIGS. 39a, bandcillustrate the production process and separation process in the production of thepricking elements8′ which are surrounded by the holding62′ and the safety cap means64′. It can also be seen fromFIG. 37 that the end of the holdingbody62′ which faces away from the safety cap means64′ is designed with a step and has astep82′ which exposes the prickingelement8′. By means of anupper blade84′ and alower blade86′ which are indicated here, the prickingelement8′ is cut form a continuous wire or tube by bringing theupper blade84′ almost into contact with thestep82′ and thus positioning it in a defined manner with respect to the holdingbody62′ and thepricking element8′. This is illustrated inFIGS. 39athrough39c.
• FIG. 40 through43 show the arrangement of thepricking elements8′0 together with the holdingbody62′ and the safety cap means64′ on thesupport14′. Thesupport14′ is designed in the form of a ring disk and has a complicated contour on its visible side which is shown here. In the case depicted here it comprises10radial recesses16′ which are bordered by a supportingwall88′ which lies in the plane of the disk and twolateral guide walls90′ which are aligned radially and perpendicularly to the former. A prickingelement8′ with a holdingbody62′ and a safety cap means64′ is slidingly displaceable radially therein in the guide recesses. Therespective pricking elements8′ are inserted into the guide recesses16′ from above, i.e., in the axial direction and then assume the positions illustrated inFIG. 34 and inFIG. 42. It can be seen that noelement8′ is situated in a circular segment91′ of thesupport14′. When the support is inserted from above into thehousing body6′, thesupport14′ is to be positioned in such a way that the circular segment91′ is oriented above theejector device10′ so that theejector device10′ extends with its outer radial end into this circular segment91′. Theejector element50′ is then more or less arranged between two adjacent pricking elements namely the first and last pricking elements, within the circular segment91′. A positioning means or a positioning aid in the form of an arrow-shaped contouring of thering disk18′ can also be seen. The prickingelements18′ are held in their positions within the guide recesses16′ of thesupport14′ by means of thering disk18′ which is made of spring steel. To this end thering disk18′ is pushed over a number of openings92′ onto correspondingpins94′ of thesupport14′ and these are then widened in the manner of a rivet, in particular by ultrasonic welding. Thering disk18′ made of spring steel has radially protrudingtongues96′ which are oriented parallel to the supportingwall88′ and hold at guide aparticular housing body62′ of arespective pricking element8′. Another strap-shapedtongue98′ which is designed in a U shape extends around eachtongue96′ and is connected with the two legs of the U shape to thering disk18′. The strap-shaped tongue forms a displacement means99′ for the safety cap means64′ to displace it out of the path of movement of thepricking element8′. The connectingwebs100′ of thetongue98′ which run in the circumferential direction are angled slightly upward in relation to the plane of therisk disk18′ and are designed in a meandering pattern. They therefore each define a contact plane which runs slightly obliquely to the plane of thering disk18′. This is for the following reason: it can be seen fromFIG. 10 that the connectingwebs100′ and the plane formed by them are also arranged obliquely in relation to thetop side102′ of the respective safety cap means64′. Likewise the respective connectingweb100′ rests under a slight pretension on thetop side102′ of the respective safety cap means64′. When a holdingbody62′ with the injectingpricking element8′ is pulled radially inward in a manner to be described in greater detail below and the weakenedarea70′ between the holdingbody62′ and the safety cap means64′ is punctured, the strap-shapedtongue98′ with its connectingweb100′ presses the respective safety cap means64′ downward across the direction of pricking or the longitudinal direction of thepricking element8′ into the position illustrated inFIG. 11. In thisdisposal position103′, the connectingweb100′ of theresilient tongue98′ rests on the surface on thetop side102′ of the respective safety cap means64′ (FIG. 43 shows thepricking elements8′ after execution of the pricking process).
• In addition, strip-shaped guide bars104′ oriented in the axial direction and engaging in the guide recesses80′ of the respective safety cap means64′ can also be seen inFIGS. 40, 42 and43. The respective safety cap means64′ is displaceable in the axial direction, i.e., perpendicular to the radially oriented pricking direction on these guide bars104′. At the same time, these guide bars104′ hold a respective safety cap means64′ undisplaceably in the radial direction so that when the holdingbody62′ is pulled inward, the weakenedarea70′ can be broken. Then subsequently, as explained above, a respective safety cap means64′ is accommodated in areceptacle cavity106′ in thesupport14′ which forms thedisposal position103′ for the safety cap means. In thisreceptacle cavity106′, a respective safety cap means is then held without play under load by theelastic tongue98′ in the form of strap. This prevents any interfering rattling noise.
• FIGS. 44 and 45 show thehousing body6′ with and without the respective components of theejector device10′. It can be seen here that the dome-shapedelevation36′ in thehousing body6′ forms a receptacle for the pushingelement50′, the pushing spring52′ and the restoring spring54′. These components are held by the cover58′ so they cannot fall out and yet they are longitudinally displaceable in the receptacle in the prickingdirection12′, i.e., in the radial direction.FIG. 14 shows in a greatly enlarged diagram the prickingelement50′ which is designed in the form of a plunger means or a ram means which has an outside diameter with a shoulder and thus forms anaxial step108′ against which the restoring spring54′ is supported at one end. At the other end the restoring spring54′ is supported against a cheek110′ of the dome-shapedelevation36′. The pushing spring52′ is supported on theend112′ which has the larger diameter, and on the other end it is supported against acheek112′ of the dome-shapedelevation36′. The pushingelement50′ also includes acoupling area116′ which is opened in the pushing direction but also in the circumferential direction. Thiscoupling area116′ is designed to be complementary to anengagement area118′ (seeFIG. 37) of the holdingbody62′ and is able to accommodate this area so that the holdingbody62′ can be coupled to the pushingelement50′ and forms a form-fitting entrainment connection with the pushingelement50′. With the orientation of the pushingelement50′ shown inFIG. 45, a holdingbody62′ of apricking element8′ can be rotated into thiscoupling area116′ by rotating thesupport14′, as illustrated inFIG. 2. If the pushingelement50′ is retracted radially inward when it is in entrainment connection with a holdingbody62′ of apricking element8′, whereby the pushing spring52′ is put under tension, then the respective safety cap means64′ which is held in a form-fitting manner in the radial direction cannot follow the movement and the weakenedarea72′ between the is broken through. As soon as the free pointed end65′ of thepricking element8′ is released from the safety cap means64′, the pricking element is moved into thedisposal position103′ (as described above) under the action of the strap-shapedelastic tongue98′. The prickingelement8′ together with the holdingbody62′ meanwhile follows the tension movement of theejector element50′. Theejector device10′ is then in the activated state and can be operated by pressing the triggering means56′ to execute the puncturing operation.
• Putting theejector device10′ under tension will now be described. As shown inFIG. 46, the plunger-like or ram-like pushingelement50′ includes atension cam120′ which protrudes across the pricking direction. Thistension cam120′ passes through alinear preparation122′ which runs in the radial direction in thebottom plate32′ of thehousing body6′. Thetension cam120′ therefore protrudes downward beyond the bottom side of thebottom plate32′. It thereby engages in anopening124′ in the above mentioned disk-shapedcomponent42′ with the operatinglever40′ that protrudes radially. This opening forms acam guidance curve126′ such that thetension cam120′ is shifted radially inward along thiscam guidance curve126′ when the disk-shapedcomponent42′ is rotated. By swiveling the operatinglever40′, which protrudes radially, in the direction of the arrow128′ (FIG. 45), the pushingelement50′ is moved radially inward against the force of the pushing spring52′ over the cam guidance curves26′ and thetension cam120′ until acatch arm130′ of the triggering means56′ engages in acatch recess132′ in the section of theejector element50′ which has a larger diameter and holds theejector element50′ at first in the tense state. When the operatinglever40′ is released, it returns to the starting position as illustrated inFIG. 45 under the influence of the restoringspring46′ mentioned above (FIG. 36). As mentioned above, the operatinglever40′ and the disk-shape component42′ form a tension means48′ for theejector device10′.
• Aweb134′ on the disk-shapedcomponent42′ extending in the circumferential direction can be seen inFIG. 48, said component being elastically deflectable slightly in the axial direction with respect to the plane of thecomponent42′ (see arrow138) because of a slot-shapeddividing line136′ which also extends essentially in the circumferential direction. On the free end of theweb134′ ashoulder140′ which protrudes in the axial direction is formed, engaging in its interior, as illustrated inFIG. 45, through a slot-shapedrecess142′ which extends in the circumferential direction in thefloor32′ of thehousing body6′. Thisshoulder140′ moves along this slot-shapedrecess142′ when the operatinglever40′ of thecomponent42′ is pivoted. Then theshoulder140′ is in rotational engagement with thesupport14′ namely until theweb134′ with itsshoulder140′ slides on the bottom side of thebottom plate32′ of thehousing body6′ onto a wedge-shaped ramp means144′ which can be seen inFIG. 12 and13. In this sliding movement theweb134′ is deflected downward in the diagram according toFIGS. 44 and 45 and theshoulder140′ “dips” into thebottom plate32′ and thereby is disengaged from rotational entrainment with thesupport14′. Thus thesupport14′ is transported due to the rotational coupling of theshoulder140′ with thesupport14′ only in this initial phase of the movement of the operatinglever40′. During this phase, thetension cam120 is not yet moved inward in the radial direction! During this initial phase of the movement of theshoulder140′ up to the ramp means144′, by rotating thesupport14′, an as yetunused pricking element8′ is brought into the working position. Then the holdingbody62′ with its engagement means118′ arranged on the inside radially is rotated into thecoupling area116′ of the pushingelement50′. Theopening124′ in the disk-shapedcomponent42′ is then designed and arranged in such a way that thetension cam120 of the pushingelement50′ cooperates with thecam guidance path126′ at the moment when the next following holdingbody62′ enters thecoupling area116′ of the pushingelement50′ and is not transported further with it. In this position, the pushingelement50′ is pulled radially inward together with the holdingbody62′ and thepricking element8′ until thecatch arm130′ engages with a catch hook in thecatch recess132′ of the pushingelement50′ by sliding along thetension cam120′ along thecam guidance curve126′. As already described above, during the tension process of theejector device10′ the weakenedarea70′ between the holdingbody62′ and the safety cap means64′ is broken and the safety cap means is moved into thedisposal position103′ shown inFIG. 43′ [sic] so that the path of movement for thepricking element8′ is released. Then if theejector device10′ is operated via the triggering means56′, the pushingelement50′ together with the holdingbody12′ and thepricking element8′ are ejected outward in the radial direction and the free end65′ of thepricking element8′ is ejected extremely briefly beyond thestop position60′ on the outside of thehousing body6′ to be able to penetrate into the surface of the skin of a user for an extremely short period of time. During this pricking operation, the retraction spring54′ is under tension and then moves the holdingbody62′ together with the prickingelement8′ rapidly back into the interior of thehousing body6′. Thespreadable web74′ then also supports the correct positioning of the usedpricking elements8′ on thesupport14′ and prevents used pricking elements together with holdingbodies62′ from slipping out of the guide recesses in thesupport14′ in the radial direction when a used support cassette is replaced with a new one, which thereby ensures safety disposal of used pricking elements.
• FIG. 49 shows a view of the bottom side of thebottom plate32′ of thehousing body6′, i.e., without the coveringpart44′ on the bottom as illustrated inFIG. 36.
• Thus, on the whole this invention makes available a pricking device with miniaturized pricking elements, thereby making it possible to design the pricking device in the manner and size of wristwatch to be worn on a user's wrist. The pricking device may also be integrated into a blood analyzer or it may have the components of a blood analyzer of the type described above. The pricking device includes a plurality of pricking elements, in particular between five and twelve, which are inserted as a cassette on thesupport14′ into thehousing body6′. To do so a user flips open thecover part4′ and places a support cassette in the interior, paying attention to certain orientation marks. Thecover part4′ is then closed and afirst pricking element8′ is brought into the working position via the operatinglever40′. In doing so, the prickingelement8′ and/or itshousing body62′ is brought into an entrainment coupling with the pushingelement50′ and is pulled radially inward following that. In this process, the safety cap means64′ on the free end65′ if thepricking element8′ is separated and is brought into adisposal position103′ on thesupport14′ across the prickingdirection12′. When thepricking device10′ activated in this way is released, the pushingelement50′ together with themolding body62′ and thepricking element8′ is accelerated suddenly in the radial direction by the release of the pushing spring52′ and is thus brought again into the starting position by means of the recoil spring54′. By operating the operatinglever40′ again, thesupport14′ is again rotated beyond theshoulder140′, i.e., the used pricking element is rotated out of the working position and a pricking element that has not yet been used is brought into the working position, etc. When all the pricking elements have been used, thesupport14′ cannot be moved further because of a stop, and the user is notified in this way that a new cassette with new pricking elements must be inserted.

Claims (48)

1. A blood analyzer comprising a device body with a blood sampling device which has a pricking element, with a testing means for accommodating a minimal quantity of blood, having an analyzer device which comprises an electronic analyzer and having a display device, together forming a complete system that can be handled as a single device, whereby the device body has a pricking position which is assigned to the working position of the pricking element for coming in contact with a skin surface of a user and a charging position designed at another location on the body of the device for charging a minimal quantity of blood coming from the previously pricked skin surface onto a testing means, whereby a plurality of testing means and pricking elements can be inserted into the device and can be brought one after the other into a working position for performing multiple measurements, whereby when a pricking element is positioned in its working position, the pricking element can be inserted into the skin surface of a user which is brought into the pricking position and blood coming from the skin surface can be charged to a testing means by being brought in contact with the skin surface in the charging positions, said testing means being in a working position of the testing means, characterized in that the testing means and the pricking elements are arranged on a carrier which is rotatable with respect to the body of the device and can be inserted together with it into the device, and by rotating the carrier the testing means and the pricking elements can be brought into different working positions with respect to the body of the device.

2. A blood analyzer according toclaim 1, characterized in that the pricking elements and the testing means are arranged on the same carrier, which can be handled manually.

3. A blood analyzer according toclaim 1, characterized in that the carrier comprises a first carrier part for the testing means and a second carrier part for the pricking elements.

4. A blood analyzer according toclaim 3, characterized in that the two carrier parts can be assembled to form a manually operable unit.

5. A blood analyzer according toclaim 3, characterized in that the carrier parts can be linked together in a rotationally fixed manner.

6. A blood analyzer according to one or more of theclaim 1, characterized in that the carrier has a central recess within which a drive device for the blood sampling device is provided.

7. A blood analyzer according to one or more of theclaim 1, characterized in that the carrier is designed in the form of a ring and is rotatable about the center of the ring.

8. A blood analyzer according to one or more of theclaim 1, characterized in that a drive device for the carrier includes internal gearing.

9. A blood analyzer according to one or more of theclaim 1, characterized in that the pricking elements are arranged on the carrier in such a way that when they are in the working position, they execute a pricking movement in the radial direction with respect to the rotatability of the carrier.

10. A blood analyzer according to one or more of theclaim 1, characterized in that the pricking elements are arranged on the carrier in such a way that when they are in the working position, they execute a pricking movement in the axial direction with respect to the rotatability of the carrier.

11. A blood analyzer according to one or more of theclaim 1, characterized in that the pricking elements are surrounded by a sterility barrier on the carrier before execution of a pricking operation.

12. A blood analyzer according to one or more of theclaim 1, characterized in that before execution of a pricking operation, a particular pricking element is arranged in a sleeve means, forming a cylindrical space, and is held by a plunger means which is movable in the sleeve means.

13. A blood analyzer according toclaim 12, characterized in that the pricking element forms an injection part of the plunger means designed as a plastic syringe part.

14. A blood analyzer according toclaim 12, characterized in that a sterility barrier is formed by the sleeve means that is closed on all sides and by the plunger means.

15. A blood analyzer according toclaim 12, characterized in that the sleeve means is covered by a film on its end facing away from the plunger means.

16. A blood analyzer according toclaim 12, characterized in that the plunger means has a sealing means with respect to a wall of the cylinder space.

17. A blood analyzer according to one ofclaim 12, characterized in that multiple sleeve means are joined together in the form of a strip and the ends of the strips are joined together to form a circular shape.

18. A blood analyzer according to one or more of theclaim 1, characterized by multiple recesses in the carrier in each of which is arranged a pricking element.

19. A blood analyzer according toclaim 18, characterized in that a wall which borders the recess is designed to be deformable so that it can be deflected by a driving device of the blood sampling device to execute the pricking procedure.

20. A blood analyzer according toclaim 18, characterized in that a wall which borders the recess has weakened zones to facilitate the deformability.

21. A blood analyzer according toclaim 18, characterized in that the recess is designed like a trough or like a half shell.

22. A blood analyzer according toclaim 18, characterized in that the sterility barrier is formed by a film-like covering means which covers the recess.

23. A blood analyzer according toclaim 1, characterized in that the pricking elements carry a safety cap means on their free end before executing a pricking operation.

24. A blood analyzer according toclaim 23, characterized in that the safety cap means is releasable from the pricking element immediately before execution of the pricking operation.

25. A blood analyzer according toclaim 24, characterized in that the respective safety cap means can be removed from the path of movement of the pricking element and brought into a receptacle space after being released from the respective pricking element.

26. A blood analyzer according to one or more of theclaim 1, characterized in that the test means are arranged on the carrier in such a way that they are axially oriented with respect to the rotatability of the carrier.

27. A blood analyzer according to one or more of theclaim 1, characterized in that the carrier has a carrier part for the test means, the carrier part in particular being in the form of a ring disk, the plane of the carrier part being oriented perpendicular to the axis of rotation of the carrier.

28. A blood analyzer according toclaim 1, characterized in that the test means are provided in recesses of the carrier part, in particular in the form of a ring disk.

29. A blood analyzer according toclaim 1, characterized in that the charging position can be covered by a movable cover part when it is not needed.

30. A blood analyzer according toclaim 29, characterized in that a drive device for the pricking element can be activated by moving the covering part in the direction of releasing the charging position.

31. A blood analyzer according toclaim 1, characterized in that the drive device for the pricking element can be activated by clamping a spring means.

32. A blood analyzer according to one or more of theclaim 1, characterized in that a manually movable control element is provided and is connected to the drive device for the pricking element and to the rotatable carrier, so that when there is a movement of the control element, the drive device for the pricking element is activated and there is a rotational movement of the carrier.

33. A blood analyzer according toclaim 32, characterized in that during a first phase of the movement in a first actuating direction, the control element can be brought into a drive connection with the carrier, and during a second phase of the movement, it can be brought out of the drive connection by moving it in the direction opposite the actuator direction.

34. A blood analyzer according toclaim 22, characterized in that a gear drive is provided for coupling the control element to the carrier.

35. A blood analyzer according toclaim 32, characterized in that the drive mechanism for the pricking element comprises a bending spring, and the control element acts on a receptacle for the bending spring and pivots this receptacle into the plane of bending of the bending spring.

36. A blood analyzer according toclaim 35, characterized in that the bending spring can be clamped into a stable clamped position across a dead point.

37. A blood analyzer according to one of claims32 throughclaim 32, characterized in that the manually movable control element is formed by the covering part.

38. A blood analyzer according to one or more of theclaim 1, characterized in that a triggering device for the drive device for the pricking element can be operated by contact of the skin surface with the pricking position.

39. A blood analyzer according toclaim 38, characterized in that the triggering device is formed by a key provided in the pricking position.

40. A blood analyzer according toclaim 38, characterized in that the deployment device is provided in the pricking position and has a recess for the passage of the pricking element for execution of the pricking operation.

41. A blood analyzer according to one or more of theclaim 1, characterized in that a retraction mechanism is provided by means of which a particular pricking element can be retracted directly following the pricking operation.

42. A blood analyzer according toclaim 41, characterized in that a spring means is provided for retracting a particular pricking element from the skin surface of the user.

43. A blood analyzer according to one or more of theclaim 1, characterized in that the particular pricking elements pass through a particular spring means.

44. A blood analyzer according to one or more of theclaim 1, characterized by a safety device which allows deployment of the pricking operation only when the device is being handled properly.

45. A blood analyzer according to one or more of theclaim 1, characterized in that the number of test means that can be handled as one unit amounts to 5 to 15.

46. A blood analyzer according to one or more of theclaim 1, characterized in that the device has an outside contour that is essentially in the form of a circular disk.

47. A blood analyzer according to one or more of theclaim 1, characterized in that it comprises a time display device.

48. A blood analyzer according to one or more of theclaim 1, characterized in that the housing body can be worn on the wrist of a user by means of a strip that can be attached to it.

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