US20050070945A1 - Single use lancet assembly - Google Patents

Abstract

A single use lancet device having a housing, with an open interior and an access opening defined therein, a lancet, with a body and a piercing tip, and disposed in the open interior of the housing so as to move between a cocked orientation and a piercing orientation, a driving assembly structured to move the lancet into the piercing orientation, and a restrictor assembly having a shoulder element and a restrictor panel operatively associated with the lancet and the housing and structured to pass over the restrictor panel upon the lancet moving from its cocked orientation to its piercing orientation, and to abut the restrictor panel upon attempted movement of the lancet back into its cocked orientation after movement into the piercing orientation, thereby preventing the lancet from moving back into the cocked orientation and preventing re-use of a contaminated piercing tip.

Description

CLAIM OF PRIORITY
• The present application is a Continuation-In-Part application of previously filed, now pending application having Ser. No. 09/903,877 which was filed on Jul. 10, 2001, which is a continuation-in-part patent application having Ser. No. 09/432,351 which was filed on Nov. 2, 1999 and which issued as U.S. Pat. No. 6,258,112 on Jul. 10, 2001, both of which are hereby incorporated by reference.
BACKGROUND OF THE INVENTION
• 1. Field of the Invention
• The present invention relates to a single use lancet assembly which is substantially compact, yet effective for piercing a patient's finger or other body part to obtain a blood sample. The single use lancet device is further configured to be substantially safe to transport and to ensure that subsequent uses of a contaminated lancet tip cannot occur.
• 2. Description of the Related Art
• Lancets are commonly utilized instruments which are employed both in hospitals and other medical facilities, as well as by private individuals, such as diabetics, in order to prick or pierce a patient's skin, typically on a finger of a patient, thereby leading to the generation of a blood sample which can be collected for testing. Because of the wide spread use of such lancets, there are a variety of lancet devices which are available for utilization by patients and/or practitioners in a variety of different circumstances.
• For example, a typical lancet may merely include a housing with a sharp piercing tip that is pushed into the patient's skin. More commonly, however, lancet devices, which house a piercing tip and/or a lancet, have been developed which effectively encase and fire the lancet into the patient's skin, thereby eliminating the need for the person taking the sample to actually push the lancet tip into the skin.
• Within the various types of specialized lancet devices, one variety are typically configured for multiple and/or repeated uses, while another category is particularly configured for single use, after which the entire device is disposed of. Looking in particular to the single use, disposable lancet devices, such devices typically include a housing which contains and directs or drives a piercing tip into the patient's skin, and which is disposed of along with the used lancet. Naturally, so to make such disposable devices cost effective for frequent use, such devices tend to be rather simplistic in nature providing only a sufficient mechanism for firing, and not overly complicating the design so as to minimize that cost.
• While existing single use devices are generally effective for achieving the piercing of the skin required for effective operation, such single use, disposable devices typically do not incorporate a large number of safety features to ensure the safe use and disposal of the device. For example, one primary area of safety which must be addressed with all lancet devices pertains to the purposeful and/or inadvertent reuse of a contaminated lancet. Unfortunately, most currently available single use lancet devices are configured such that after a use thereof has been achieved, it is possible for a patient to re-cock the device, thereby allowing for a subsequent, inappropriate use.
• As a result, it would be highly beneficial to provide a single use lancet device which is substantially compact and disposable, can be manufactured in a substantially cost effective manner, and which nevertheless is substantially safe to utilize, affirmatively preventing re-use, once contaminated.
SUMMARY OF THE INVENTION
• The present invention relates to a single use lancet device configured to pierce a patient's skin and be useable only a single time, thereby preventing reuse of a contaminated lancet piercing tip. In particular, the present single use lancet device includes a housing having an open interior area and an access opening defined therein. The housing is preferably compact and includes a lancet disposed within its open interior.
• Looking to the lancet, it is preferably of the type which includes a body and a piercing tip. It is the piercing tip which includes the pointed configuration structured to penetrate or pierce a patient's skin for the drawing of blood. Moreover, the lancet is cooperatively disposed within the open interior of the housing such that the lancet may move between at least a cocked orientation and a piercing orientation wherein the patient's skin is penetrated by the piercing tip.
• Also operatively associated with the lancet is a driving assembly. The driving assembly is structured to move or drive the lancet, at least temporarily, into the piercing orientation from the cocked orientation. Preferably, however, the device is configured such that the cocked orientation is generally maintained until affirmatively released by a user. Along these lines, the present single use lancet device also includes an actuation button operatively associated with the lancet. The actuation button is structured to protrude from the housing, at least when the lancet is disposed in the cocked orientation, so as to be effectively actuatable. When the lancet is in the cocked orientation, the actuation assembly maintains the lancet in that cocked orientation, however, when it is actuated, such as by being pushed inward, the lancet is released from the cocked orientation and the driving assembly propels the lancet at least temporarily into its piercing orientation wherein the piercing tip protrudes through the access opening of the housing.
• In order to ensure that lancet device can only be used a single time, the present single use lancet device further includes abutment structure cooperatively disposed between the housing and the lancet. The abutment structure is configured to prevent the lancet from moving into the cocked orientation after movement into the piercing orientation. Preferably, the abutment structure includes a shoulder element and a restrictor panel operatively associated with the lancet and the housing. In particular, the shoulder element is structured to pass over the restrictor panel when the lancet moves from its cocked orientation to its piercing orientation. Conversely, however, when a user attempts to move the lancet back into the cocked orientation after it moved into the piercing orientation, the restrictor panel abuts the shoulder element preventing further movement. As a result, movement of the lancet into the cocked orientation is prevented once the lancet has been used a single time, and subsequent uses of a contaminated lancet are prevented.
BRIEF DESCRIPTION OF THE DRAWINGS
• For a fuller understanding of the nature of the present invention, reference should be had to the following detailed description taken in connection with the accompanying drawings in which:
• FIG. 1 is a perspective illustration of an embodiment of the single use lancet device of the present invention;
• FIG. 2 is a side cross section view of the single use lancet device of the present invention in an unused, initially un-cocked orientation;
• FIG. 3 is a side cross section view of the single use lancet device of the present invention in a cocked orientation;
• FIG. 4 is a side cross section view of the single use lancet device of the present invention after it has moved into a piercing orientation from the cocked orientation;
• FIG. 5 is a front cross section view of the single use lancet device of the present invention; and
• FIG. 6 is a side cross section view of another embodiment of the single use lancet device of the present invention after the lancet has moved from the cocked orientation through the piercing orientation.
• Like reference numerals refer to like parts throughout the several views of the drawings.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
• Shown throughout the Figures, the present invention is directed towards a single use lancet device, generally indicated as10. In particular, the singleuse lancet device10 of the present invention includes a housing, generally indicated as20. Thehousing20 is preferably substantially small and compact, and may be made of one or a plurality of segments, preferably of a generally rigid, disposable material, such as plastic. Thehousing20 includes an at least partiallyopen interior28 and at least one access opening22 defined therein. Theopen interior28 of thehousing20 is preferably sized and configured to effectively receive a lancet, generally30 therein.
• In particular, thelancet device10 of the present invention also comprises alancet30. Thelancet30 preferably includes abody32 and apiercing tip34. Thepiercing tip34 is what will be used to pierce a person's skin so as to draw blood to be utilized for a sample and or test procedure. Moreover, thebody32 may be the shaft of thepiercing tip34 and/or an additional structure such as that depicted in the Figures. Regardless, however, thelancet30 is structured to move within theopen interior28 of ahousing20, preferably at least between a cocked orientation, as depicted inFIG. 3, and a piercing orientation wherein thepiercing tip34 oflancet30 at least temporarily protrudes through the access opening22.
• Looking in further detail to the illustratedlancet device10, and the path of movement of thelancet30 within thehousing20, when thelancet device10 is initially obtained for use, thelancet30 is preferably maintained in an un-used, initially un-cocked and pre-fired orientation, as best seen inFIG. 2. In this initially un-cocked and pre-fired orientation aprotective cover40 preferably extends into theopen interior28 of thehousing20 so as to at least partially and removably cover thepiercing tip34 of thelancet30, thereby maintaining the safety and sterility of thepiercing tip34 when not being used. In this regard, theprotective cover40 may be formed from a variety of preferably rigid materials and is structured to protrude from thehousing20. Furthermore, theprotective cover40 may include anenlarged head42 configured to facilitate grasping thereof.
• Preferably utilizing theprotective cover40, theprotective cover40 is structured to be pushed inwardly into the housing by a user, as depicted by the arrows onFIG. 2, thereby pushing thelancet30 further into thehousing20. Such pushing of thelancet30 into thehousing20 results in a positioning of thelancet30 in its cocked orientation, best illustrated inFIG. 3. Once in the cocked orientation, theprotective cover40 is then structured to be removable from the piercingtip34, such as by a twisting thereof, thereby leaving the piercingtip34 completely exposed for use.
• The single use lancet of the present invention further includes a driving assembly, generally38. The drivingassembly38 is particularly configured to move thelancet30 at least temporarily into its piercing orientation wherein the piercingtip34 protrudes through the access opening22 of the housing20 a desired amount. In particular, if desired, a depth adjustment structure could be positioned at the access opening to control the amount which the piercing tip protrudes from thehousing20. For example, a threaded washer type element could be adjustably secured to thehousing20 in generally surrounding relation to theaccess opening22.
• Looking further to the driving assembly, preferably the driving movement occurs when thelancet30 is released from its cocked orientation. In the illustrated embodiment, the drivingassembly38 includes a biasing element operatively disposed between thelancet30 and thehousing20. Moreover, in the illustrated embodiment a spring is preferably utilized, however, it is recognized that a variety of other driving assemblies can be utilized, including a wedge assembly, a hammer type assembly and/or a resilient material plate, segment or extension, all of which may be configured to move thelancet30 from the cocked orientation into the piercing orientation. Further, it is preferred that based upon the sizing of thehousing20 and the nature and size of the drivingassembly38, that after thelancet30 has moved into the piercing orientation wherein the piercingtip34 protrudes through the access opening22, the lancet tends to be retracted back into the housing, as best illustrated inFIG. 4. As a result, the used piercingtip34 is effectively concealed within thehousing20 subsequent to usage, protecting against inadvertent engagement between a person and the used piercingtip34.
• In order to retain, and subsequently effectively release thelancet30 from its cocked orientation, thesingle use lancet10 of the present invention further includes an actuation assembly, generally,50. Although a variety of different actuation assemblies may be incorporated so as to retain and then release thelancet30 from its cocked orientation, which in the illustrated embodiment allows the driving assembly to be released from its compressed orientation, theactuation assembly50 includes anactuation button52. In the illustrated embodiment, theactuation button52 is structured to at least temporarily protrude from thehousing20, such as through anactuation aperture24. Furthermore, theactuation button52 is preferably secured, either directly or indirectly to thelancet30, so as to generally restrict movement of thelancet30 from the cocked orientation when it protrudes from thehousing20. As a result, the cocked orientation is maintained while the actuation button protrudes from thehousing20. Specifically, in the illustrated embodiment, theactuation button52 extends from thebody32 of thelancet30 by a biased segment, and as such, by abutting thehousing20 within theactuation opening24, movement of thelancet30 from the cocked orientation is prevented. When, however, theactuation button52 is actuated, such as by being pushed inwardly, into the housing, it is at least temporarily concealed within thehousing20, removing the abutting engagement and allowing thelancet30 to freely move within thehousing20, at least temporarily into the piercing orientation. Although the preceding defines the illustrated actuation assembly, it is understood that a variety of alternative actuation assemblies, such as including separate elements to retain and to release the lancet may also be provided, and or including structures which are actually part of the driving assembly and/or remain at least partially exposed and actuatable at all times, may also be provided.
• Looking in particular toFIG. 5, movement of thelancet30 through thehousing20 is preferably maintained in a substantially linear path by a guide assembly. In the illustrated embodiment, the guide assembly includes at least oneguide ridge33 protruding from thebody32 of thelancet30, and at least onecorresponding guide track25 structured to movably receive theguide ridge33 therein. Theguide track25 preferably extends at least partially along a length of theopen interior28 of thehousing20 so as to maintain theguide ridge33 effectively therein during a necessary range of motion of thelancet30. As depicted inFIG. 5, preferably a pair ofguide ridges33 are disposed on opposite sides of thelancet body32, with a corresponding pair of oppositely disposed guide tracks25 being defined in the housing. It is of course, however, understood that the guide tracks25 need not necessarily be directly defined in thehousing20, but may be additional elements secured therein, and conversely the guide track(s) may be defined in or on thelancet body32, with the guide ridge(s) extending inwardly from thehousing20.
• Thesingle use lancet10 of the present invention further includes a restrictor assembly, generally60. Therestrictor assembly60 is structured to substantially prevent thelancet30 from moving back into the cocked orientation ofFIG. 3 after it has moved, even momentarily, into the piercing orientation wherein a patient's skin may be pierced and the piercingtip34 become contaminated. In this regard, the cocked orientation may be defined by the lancet being positioned such that actuation of the actuation assembly causes the driving assembly to urge the lancet into the piercing orientation. In the illustrated embodiment, therestrictor assembly60 is structured such that when thelancet30 is disposed in the initially un-cocked orientation, as best seen inFIG. 2, movement of thelancet30 back into the cocked orientation can effectively result despite therestrictor assembly60. After, however, thelancet30 has moved into its piercing orientation wherein the piercingtip34 has protruded through the access opening22 of thehousing20, the restrictor assembly is configured such that thelancet30 can no longer be pushed back into the cocked orientation. As a result, a patient, can neither accidentally nor purposefully reuse thesingle use lance10 of the present invention after it has been fired.
• In the illustrated embodiment, therestrictor assembly60 includes an abutment structure cooperatively disposed between thehousing20 and thelancet30. The abutment structure is configured to physically prevent movement of the lancet back into the cocked orientation. Preferably, the abutment structure comprises ashoulder element62 and arestrictor panel64 configured to freely pass one another when thelancet30 moves from the cocked orientation to the piercing orientation, but also configured to abut one another upon attempted movement of thelancet30 back into the cocked orientation after it has moved into the piercing orientation. Looking toFIG. 4, the illustratedshoulder element62 includes an at least partially slopped and preferably biased configuration, such as an elongate biased finger that at least partially retracts inward towards thebody32 of thelancet30 so as to facilitate passage thereof past therestrictor panel64. In this regard, preferably mating slopped surfaces are provided on theshoulder element62 and therestrictor panel64, thereby facilitating the sliding passages past one another, and indeed, promoting an at least partial retraction of theshoulder element62 to further facilitate this passage past one another, upon movement of thelancet30 in a first direction towards the access opening22 of thehousing20. Theshoulder element62 is also, however, structured to generally expand after it has passed therestrictor panel64, such as back into its normal unretracted and/or un-compressed orientation, such that it will abut therestrictor panel64 upon attempted movement of thelancet30 in a second direction opposite the access opening22 of thehousing20.
• Although an opposite configuration could be just as effectively utilized, in the illustrated embodiment, thebiased finger62 of the shoulder element extends from thelancet30, preferably generally toward the piercingtip34 of the lancet30., while therestrictor panel64 protrudes from thehousing20, extending into theopen interior28 of thehousing20. Along these lines, therestrictor panel64 includes a protruding element preferably with the aforementioned slopped configuration which downwardly slopes away from the piercingtip34 of thelancet30 facilitating the aforementioned sliding passage past theshoulder element62.
• So as to provide generally secure movement restriction through effective abutment, both theshoulder element62 and therestrictor panel64 each preferably include abutment surfaces63 and65, respectably. The abutment surfaces63 and65 are structured to generally engage and abut one another, as best illustrated inFIG. 4, thereby preventing movement of thelancet30 back into the cocked orientation. In the illustrated embodiment, the abutment surfaces63,65 are generally flat, although it is recognized that interlocking fingers or wedges, and/or other types of engaging structures that prevent relative movement in at least one direction could also be effectively utilized.
• Addressing further the restrictor assembly of the present invention, it is understood that a variety of different restrictor assemblies may be effectively utilized which prevent movement of alancet30 back into a cocked orientation after thelancet30 has moved sufficiently forward and/or has moved into the piercing orientation. As such, the embodiment illustrated inFIGS. 2 through 5 is merely a single illustration of a preferred contemplated embodiment, and other alternative embodiments are also considered within the scope of the restrictor assembly of the present invention. By way of example, and looking specifically toFIG. 6, theactuation button52 itself may comprise part of the restrictor assembly. In such an embodiment, arestrictor panel25 is defined in thehousing20, and theactuation button52 as part of the biased finger of the shoulder element, includes anabutment surface54 which engages a confronting surface of therestrictor panel25. In such an embodiment, the initially un-cocked orientation provides for theactuation button52 to be initially disposed rearward of therestrictor panel25 so as to permit movement of thelancet30 at least initially into the cocked orientation. Moreover, in this embodiment, the previous embodiment, and/or any other alternative embodiment, if desired, theprotective cover40 may be equipped with an interior shield segment or other configuration which extends into the housing and maintains the biased finger of theshoulder element62, or another component of the restrictor assembly, in a generally compressed and/or retracted orientation until theprotective cover40 is removed. As a result, in such an embodiment, so long as theprotective cover40 is maintained on the piercingtip34, thelancet30 is always able to return the cocked orientation. Preferably, however, re-positioning of the protective cover onto the piercing tip in such a manner as to be able to “reset” thelancet30, allowing to move once again into the cocked orientation will be prevented.
• Since many modifications, variations and changes in detail can be made to the described preferred embodiment of the invention, it is intended that all matters in the foregoing description and shown in the accompanying drawings be interpreted as illustrative and not in a limiting sense. Thus, the scope of the invention should be determined by the appended claims and their legal equivalents.
• Now that the invention has been described,

Claims (11)

1. A single use lancet device comprising:

a housing;

a lancet;

said lancet including a piercing tip;

said lancet at least partially disposed in said housing and structured to move at least between a cocked orientation and a piercing orientation;

a biasing element structured to move said lancet at least temporarily into said piercing orientation;

an actuator structured to be actuated by a user so as to result in said biasing element moving said lancet at least temporarily into said piercing orientation; and

a restrictor assembly independent of said biasing element and structured to engage said lancet and thereby prevent said lancet from being moved back into said cocked orientation after movement of said lancet at least temporarily into said piercing orientation even if an implement pushes said lancet.

2. A single use lancet as recited inclaim 1 wherein said biasing element comprises a spring.

3. A single use lancet as recited inclaim 1 wherein said actuator comprises a button structured to protrude from said housing when said lancet is disposed in said cocked orientation.

4. A single use lancet as recited inclaim 1 wherein said restrictor assembly comprises an abutment structure cooperatively disposed between said housing and said lancet and structured to prevent said lancet from moving into said cocked orientation after movement into said piercing orientation.

5. A single use lancet as recited inclaim 4 wherein said abutment structure comprises a shoulder element and a restrictor panel, said restrictor panel and said shoulder element structured to pass one another upon said lancet moving from said cocked orientation to said piercing orientation, and to abut one another upon attempted movement of said lancet into said cocked orientation after movement into said piercing orientation.

6. A single use lancet as recited inclaim 5 wherein said shoulder element is structured to move relative to said restrictor panel so as to facilitate passage of said restrictor panel and said shoulder element past one another in a first direction corresponding movement of said lancet from said cocked orientation to said piercing orientation, and to block movement of said restrictor panel in a second direction generally opposite said first direction subsequent to said passage past one another in said first direction.

7. A single use lancet as recited inclaim 6 wherein said shoulder element comprises a biased finger extending from said lancet, and said restrictor panel comprises a protruding element protruding from said housing.

8. A single use lancet as recited inclaim 7 wherein said protruding element includes a sloped configuration which downwardly slopes away from said piercing tip of said lancet so as to facilitate passage thereof past said biased finger upon said lancet moving in a first direction towards said access opening.

9. A single use lancet as recited inclaim 4 wherein said abutment structure further comprises said actuator structured to release said lancet from said cocked orientation.

10. A single use lancet as recited inclaim 1 further comprising a protective cover structured to at least partially and removably cover said piercing tip of said lancet at least prior to movement of said lancet into said cocked orientation.

11. A single use lancet device comprising:

a housing;

a lancet;

said lancet disposed at least partially in an interior of said housing and structured to move relative to said housing;

a biasing element structured to move said lancet into a second position relative to said housing wherein said lancet pierces a patient's skin from a first position relative to said housing wherein said lancet is disposed immediately prior to being moved by said biasing element towards and into said second position;

an actuator structured to be actuated by a user so as to result in said biasing element moving said lancet; and

an abutment structure independent of said biasing element and cooperatively disposed between said housing and said lancet, said abutment structure structured to prevent movement of said lancet back into said first position relative to said housing after movement of said lancet into said second position relative to said housing even if an implement pushes said lancet towards said first position relative to said housing.

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