US20070156094A1 - Insertion Device for an Insertion Set and Method of Using the Same - Google Patents

Abstract

An insertion device and insertion set. The insertion device for inserting at least a portion of at least one piercing member of an insertion set through the skin of a patient includes a device housing, a carrier body and a driver. The carrier body is slidably received within the device housing for movement between an advanced position and a retracted position. The carrier body also includes a receiving structure to support the insertion set in a position with the at least one piercing member oriented for insertion through the skin of the patient at a predetermined angle relative to the skin of the patient upon movement of the carrier body from the retracted position to the advanced position. The driver is operatively coupled between the device housing and the carrier body to urge the carrier body with a controlled force and speed from the retracted position toward the advanced position to place at least a portion of the at least one piercing member of the insertion set thorough the skin of the patient to install the insertion set to the patient. The receiving structure of the carrier body is removable from the insertion set while maintaining the installation of the insertion set to the patient.

Description

RELATED APPLICATIONS
• This application is a continuation-in-part of U.S. patent application Ser. No. 09/002,303, filed Dec. 31, 1997, which is herein specifically incorporated by reference.
FIELD OF THE INVENTION
• This invention relates generally to an insertion device for automatic placement of an insertion set through the skin of a patient, and in particular embodiments to a compact and easily operated insertion device for placement of an insertion needle of a subcutaneous insertion set or the like through the skin of a patient with a controlled force and insertion speed by the patient.
BACKGROUND OF THE INVENTION
• Medical needles are widely used in the course of patient care and treatment, particularly with respect to the delivery of selected medications to a patient. In one common form, hollow hypodermic needles are employed for transcutaneous delivery of a selected medication from a syringe or the like. In another common form, insertion needles are employed for transcutaneous placement of a soft and relatively flexible tubular cannula, followed by insertion needle removal and subsequent infusion of medical fluid to the patient through the cannula. More recently, insertion needles have also been used for transcutaneously placing other medical devices such as a subcutaneous sensor for monitoring specified patient parameters, such as blood glucose level.
• In certain medical treatment regimens, it may be necessary or desirable for the patient to transcutaneously place the medical needle. For example, diabetic patients frequently self-administer insulin injections or periodically place a subcutaneous insertion with a cannula for subsequent programmable delivery of insulin by means of a medication infusion pump of the general type described in U.S. Pat. No. 4,685,903. Such subcutaneous insertion sets are disclosed, for example, in U.S. Pat. Nos. 4,755,173; 5,176,662; and 5,257,980 which are incorporated by reference herein. Diabetic patients may also use a subcutaneous insertion set to periodically place a transcutaneous glucose sensor wherein such sensor insertion sets are disclosed, for example, In U.S. Pat. Nos. 5,390,674; 5,568,806; 5,586,553, which are also incorporated by reference herein.
• Some patients are reluctant or hesitant to pierce their own skin with a medical needle, and thus encounter difficulties in correct needle placement for proper administration of the medication. Such difficulties can be attributable to insufficient manual dexterity or skill to achieve proper needle placement or, alternately to, anxiety associated with anticipated discomfort as the needle pierces the skin. This problem can be especially significant with medications delivered via a subcutaneous flexible insertion set, since incorrect placement can cause kinking of the cannula and resultant obstruction of medication flow to the patient. Cannula kinking can be due to insertion set placement at an incorrect angle relative to the patients skin, and/or needle placement with an incorrect force and speed of insertion.
• The present invention relates to an automatic injector, particularly for use with a subcutaneous insertion set, for quickly and easily placing an insertion needle through the skin of a patient at the correct insertion angle, and with a speed and force of insertion which minimizes patient discomfort.
SUMMARY OF THE DISCLOSURE
• It is an object of an embodiment of the present invention to provide an improved insertion device and insertion set, which obviates for practical purposes, the above mentioned limitations.
• According to an embodiment of the invention, an injector is provided for quick and easy transcutaneous placement of a medical needle through the skin of a patient, particularly such as an insertion of a subcutaneous insertion set. The injector is designed to place the needle through the skin at a selected insertion angle and with a controlled force and speed of insertion, to ensure proper needle placement with minimal patient discomfort. The injector is particularly designed to meet these objectives, while safeguarding against undesired projection of the medical needle through free space, in the event that the injector is actuated in spaced relation to the patient's skin.
• The injector comprises a spring-loaded plunger having a head for receiving and supporting an insertion set in a position with an insertion projecting outwardly for transcutaneous placement through the skin of a patient. The plunger is designed for retraction and retention within a barrel to a cocked position with a drive spring compressed in a manner applying a predetermined spring force to the plunger head. A front or nose end of the injector barrel is designed for pressed placement against the skin of a patient, at a selected needle insertion site, and in an orientation with the needle disposed at a correct or desired insertion angle. A trigger member is operable to release the plunger and thereby permit the drive spring to carry the insertion set toward the patient's skin with a controlled force and speed, resulting in proper transcutaneous placement of the insertion needle with minimal patient discomfort.
• The plunger head includes a safety lock mechanism to retain the insertion set against projection from the injector barrel. In one preferred form, the safety lock mechanism comprises at least one and preferably a pair of safety lock arms for engaging and retaining the insertion set when the plunger is retracted from a fully advanced position. Each safety lock arm includes a cam lobe for engaging an appropriately shaped recess on the insertion set to prevent release thereof from the plunger head, unless and until the plunger head is returned to the fully advanced position. In such fully advanced position, the shape of the cam lobe permits quick and easy separation of the injector from the insertion set with a minimal separation force.
• In operation, the safety lock arms thus prevent projection of the insertion set from the injector, in the event that the trigger member is actuated with the nose end of the barrel spaced from the skin of a patient. In that event, the plunger head is advanced with the controlled force and speed to the fully advanced position, but the insertion set is not thrown from the injector as a projectile. Instead, the insertion set travels rapidly with the plunger head to the fully advanced position, whereat the injector can be separated with minimal separation force from the insertion set.
• In an alternative preferred form, the safety lock mechanism comprises a plunger head having a cylindrical shape defining a forwardly open cavity for receiving and supporting an insertion set with the insertion needle and cannula projecting outwardly. In this embodiment, the plunger head includes a radially inwardly projecting rim at a forward or nose end thereof, wherein the rim defines an oval-shaped opening. The size of the rim opening permits relatively free reception of a hub on the insertion set, with the infusion set oriented at an angle relative to a central axis of the plunger head and barrel. The insertion set is then reoriented to align the insertion needle coaxially with the central axis of the barrel and plunger head, so that the rim is received into a recess on the insertion set and functions to retain the infusion set against undesired release from the injector during spring-driven placement of the needle. After needle placement, the injector is released from the insertion set with minimal separation force by orienting the injector angularly relative to the insertion set to permit free slide out passage of the hub through the oval rim opening.
• In a further alternative form of the invention, the plunger head is shaped to define a laterally open undercut slot sized for relatively free slide-fit reception of the needle hub of the insertion set. In this version, the insertion set is assembled quickly and easily with the plunger head of the injector by laterally sliding the hub into the laterally open slot, thereby orienting the medical needle generally coaxially relative to the central axis of the injector barrel and plunger head. In this position, the plunger head can be retracted and locked, followed by appropriate trigger member release for transcutaneously placing the medical insertion needle. After the needle is placed on the patient, the injector can be disassembled from the insertion set by laterally sliding the injector relative to the needle hub. Alternatively, the injector can be withdrawn or retracted from the patient's skin to slidably separate the needle from the insertion set which remains in place on the patient's skin.
• In other embodiments of the present invention, an insertion device for inserting at least a portion of at least one piercing member of an insertion set through the skin of a patient includes a device housing, a carrier body and a driver. The carrier body is slidably received within the device housing for movement between an advanced position and a retracted position. The carrier body also includes a receiving structure to support the insertion set in a position with the at least one piercing member oriented for insertion through the skin of the patient at a predetermined angle relative to the skin of the patient upon movement of the carrier body from the retracted position to the advanced position. The driver is operatively coupled between the device housing and the carrier body to urge the carrier body with a controlled force and speed from the retracted position toward the advanced position to place at least a portion of the at least one piercing member of the insertion set thorough the skin of the patient to install the insertion set to the patient. The receiving structure of the carrier body is removable from the insertion set while maintaining the installation of the insertion set to the patient.
• In particular embodiments, the predetermined angle relative to the skin is about 90 degrees, between 90 degrees and 10 degrees, or is after insertion between 0 and 10 degrees. In additional embodiments, the insertion set is a transuctaneous insertion set, a subcutaneous insertion set, an infusion set, sensor set or the like. In still other embodiments, the insertion set rests mainly on the surface of the skin after insertion or the insertion set is implanted in the skin of the patient. In preferred embodiments, the at least one piercing member is a needle. In alternative embodiments, the at least one piercing member is a plurality of needles, and can also be a plurality of micro-needles. Also, in some embodiments, the insertion set insertion set can be both an infusion set and a sensor set combined into an integral unit.
• In yet other embodiments the insertion device, the device housing has a forward end defining a generally planar angled insertion contact surface for placement against the skin of a patient with the device housing in a predetermined orientation relative to the patient's skin that mirrors the predetermined angle relative to the skin of the patient. Other embodiments include a trigger mechanism that actuates the driver. For instance, the trigger mechanism includes at least one trigger for fingertip depression to actuate the driver for movement of the carrier body from the retracted position to the advanced position. In addition, the driver can include at least one spring for spring-loaded movement of the carrier body from the retracted position to the advanced position. Further, the driver can include a force changing mechanism that permits alteration of the controlled force and speed of the carrier body moving from the retracted position to the advanced position from one insertion cycle to another insertion cycle. In still further embodiments, the device housing and the carrier body include a cooperatively engageable track mechanism for guiding movement of the carrier body between the advanced and retracted positions while retaining the carrier body against rotation relative to the device housing.
• In additional embodiments of the insertion device, the at least one piercing member is provided with a piercing member hub as part of the insertion set. In addition, the receiving structure of the carrier body includes a recess formed therein for mated slide-fit reception of the piercing member hub of the insertion set. Further, the recess of the receiving structure can include a laterally open undercut recess. Alternatively, the receiving structure may include a safety retainer structure that retains the at least one piercing member on the receiving structure during movement from the retracted position to the advanced position. This safety retainer structure permits separation of the at least one piercing member from the carrier body when the carrier body is in the advanced position.
• Yet another embodiment of the present invention is directed to an insertion set for insertion through the skin of a patient by an insertion device. The insertion device has a slidable carrier body for movement between an advanced position and a retracted position. The carrier body of the insertion device including a receiving structure to support the insertion set in a position for insertion through the skin of the patient upon movement of the carrier body from the retracted position to the advanced position. The insertion device also having a driver operatively coupled to the carrier body that urges the carrier body with a controlled force and speed from the retracted position toward the advanced position for insertion of the insertion set thorough the skin of the patient. The insertion set includes at least one piercing member and a set housing. The at least one piercing member includes a portion of the at least one piercing member that is insertable through the skin of the patient. The set housing is coupled to the at least one piercing member. Also, the set housing is shaped to fit within the carrier body of the insertion device to orient the at least one piercing member for placement through the skin of the patient of at least a portion of the at least one piercing member at a predetermined angle relative to the skin of the patient to install the insertion set to the patient. The set housing of the insertion set is removable from the receiving structure of the carrier body while maintaining the installation of the insertion set to the patient.
• In particular embodiments of the insertion set, the predetermined angle relative to the skin is about 90 degrees, between 90 degrees and 10 degrees, or is after insertion between 0 and 10 degrees. In additional embodiments, the insertion set is a transuctaneous insertion set, a subcutaneous insertion set, an infusion set, sensor set or the like. In still other embodiments, the insertion set rests mainly on the surface of the skin after insertion or the insertion set is implanted in the skin of the patient. In preferred embodiments, the at least one piercing member is a needle. In alternative embodiments, the at least one piercing member is a plurality of needles, and can also be a plurality of micro-needles. Also, in some embodiments, the insertion set can be both an infusion set and a sensor set combined into an integral unit.
• Other features and advantages of the invention will become apparent from the following detailed description, taken in conjunction with the accompanying drawings which illustrate, by way of example, various features of embodiments of the invention.
BRIEF DESCRIPTION OF THE DRAWINGS
• A detailed description of embodiments of the invention will be made with reference to the accompanying drawings, wherein like numerals designate corresponding parts in the several figures.
• FIG. 1 is a perspective view illustrating use of an automatic injector embodying the novel features of the invention;
• FIG. 2 is an enlarged front elevation view of the injector shown inFIG. 1;
• FIG. 3 is a front or nose end view of the injector, taken generally on the line3-3 ofFIG. 2;
• FIG. 4 is an enlarged exploded perspective view illustrating assembly of the injector with a subcutaneous insertion set;
• FIG. 5 is a further enlarged longitudinal sectional view taken generally on the line5-5 ofFIG. 4;
• FIG. 6 is a transverse sectional view taken generally on the line6-6 ofFIG. 5;
• FIG. 7 is an enlarged longitudinal sectional view taken generally on the line7-7 ofFIG. 2;
• FIG. 8 is an enlarged and exploded fragmented perspective view illustrating a trigger assembly for use in the injector;
• FIG. 9 is a longitudinal sectional view similar toFIG. 5, and showing the injector with insertion set received therein for transcutaneous placement through the skin of a patient;
• FIG. 10 is a transverse sectional view taken generally on the line10-10 ofFIG. 9;
• FIG. 11 is a longitudinal sectional view taken generally on the line11-11 ofFIG. 9;
• FIG. 12 is a rear end elevation view taken generally on the line12-12 ofFIG. 11, and depicting the trigger assembly in a locked position;
• FIG. 13 is an enlarged fragmented longitudinal view similar to a portion ofFIG. 11, but depicting actuation of the trigger assembly for releasing the spring-loaded plunger;
• FIG. 14 is a rear end elevation view taken generally on the line14-14 ofFIG. 13, similar toFIG. 12, but showing the trigger assembly in an unlocked position;
• FIG. 15 is a fragmented longitudinal sectional view depicting the spring-loaded plunger in a fully advanced position with the infusion set placed on the patient's skin;
• FIG. 16 is an exploded perspective view illustrating separation of the insertion needle from the cannula of the subcutaneous insertion set;
• FIG. 17 is a perspective view depicting an alternative preferred form of the invention;
• FIG. 18 is a front elevation view of the injector shown inFIG. 17;
• FIG. 19 is a front or nose end view of the injector, taken generally on the line19-19 ofFIG. 18;
• FIG. 20 is an enlarged side elevation view of the injector, taken generally on the line20-20 ofFIG. 19;
• FIG. 21 is a further enlarged longitudinal sectional view taken generally on the line21-21 ofFIG. 17;
• FIG. 22 is an enlarged exploded perspective view illustrating construction details of a plunger and trigger member for use in the injector ofFIG. 17;
• FIG. 23 is an enlarged longitudinal sectional view similar toFIG. 21, and depicting the injector with the trigger member in a cocked position;
• FIG. 24 is a fragmented perspective view showing the upper end of the injector depicted inFIG. 23, with the trigger member in the cocked position;
• FIG. 25 is an enlarged and fragmented longitudinal sectional view illustrating actuation of the trigger member;
• FIG. 26 is an enlarged and fragmented longitudinal sectional view showing the plunger in a fully advanced position with the infusion set placed on the patient's skin;
• FIG. 27 is an enlarged fragmented longitudinal sectional view taken generally on the line27-27 ofFIG. 22, and depicting a portion of the plunger;
• FIG. 28 is a front or nose end elevational view of the plunger, taken generally on the line28-28 ofFIG. 27; and
• FIG. 29 is an enlarged fragmented longitudinal sectional view illustrating release of the injector from an infusion set placed on the patient's skin;
• FIG. 30 is an exploded prospective view generally similar toFIG. 17, but depicting a further alternative preferred form of the invention, and showing assembly of an insertion set with the illustrative injector;
• FIG. 31 is a perspective view similar toFIG. 32, depicting further assembly of the insertion set with the injector;
• FIG. 32 is an enlarged fragmented vertical sectional view taken generally on the line32-32 ofFIG. 31;
• FIG. 33 is a perspective view showing use of the injector ofFIGS. 30-32 for transcutaneous placement of the insertion set; and
• FIG. 34 is an exploded perspective view similar toFIG. 33, and showing use of the injector to separate a medical needle from the installed insertion set.
• FIG. 35 is a perspective view of an insertion device with one type of an insertion set in accordance with a second embodiment of the present invention.
• FIG. 36 is a bottom perspective view of the insertion device ofFIG. 35.
• FIG. 37 is a side plan view of the insertion device and insertion set shown inFIG. 35.
• FIG. 38 is an exploded cross-sectional view of the insertion device and the one type of insertion set as shown along the line38-38 inFIG. 37.
• FIG. 39 is a top perspective view of one type of insertion set for use with the insertion device shown inFIG. 35.
• FIGS. 40a-40gillustrate the steps of inserting the one type of insertion set ofFIG. 39 with the insertion device ofFIG. 35.
• FIG. 41 is a perspective view of an insertion device with one type of an insertion set in accordance with a third embodiment of the present invention.
• FIG. 42 is an exploded perspective view of the insertion device shown inFIG. 41.
• FIG. 43 is an exploded side plan view of the insertion device and the one type of insertion set shown inFIG. 41.
• FIG. 44 is an enlarged side plan view of the one type of insertion set held in a carrier body of the insertion device shown inFIG. 41.
• FIG. 45 is a front perspective view of the insertion device and the one type of insertion set shown inFIG. 41.
• FIG. 46 is a cross-sectional view of the insertion device and the one type of insertion set as shown along the line46-46 inFIG. 45.
• FIG. 47 is a top schematic view of an insertion device in accordance with a fourth embodiment of the present invention.
• FIGS. 48a-48dare cross-sectional views of a force changing mechanism for use with embodiments of the present invention.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
• As shown in the drawings for purposes of illustration, the invention is embodied in an insertion device for insertion sets such as an infusion set, sensor set, medical device, or the like. Further embodiments of the insertion device may be used to insert other insertion sets or medical devices such as biodegradable implants, capsules, impregnated threads (with medications or the like). Other insertion sets may be directed to a threaded needle insertion set, such as that described in U.S. Pat. No. 5,584,813 issued Dec. 17, 1996 to Livingston et al. entitled “Subcutaneous Injection Set” and U.S. Pat. No. 5,779,665 issued on Jul. 14, 1998 to Mastrototaro et al. entitled “Transdermal Introducer Assembly”, which are herein incorporated by reference. In addition, the insertion sets may be coated with medications, or other agents, that inhibit infection and/or promote healing of the insertion site. Preferred embodiments of the insertion device and insertion sets are for transcutaneous placement of the insertion set in subcutaneous tissue. However, in alternative embodiments, the insertion set may be inserted into other subdermal tissues. In addition, still further embodiments may be used to place the sets in other types tissue, such as muscle, lymph, organ tissue or the like, and used in animal tissue. In preferred embodiments of the present invention, the insertion device is loaded with a standard hand-held insertion set, or the like, and then placed against the skin of the user, where the insertion device is activated to transcutaneously place a portion of the insertion set, or the like, subcutaneously in a quick manner that minimizes pain and/or discomfort to the user. However, it will be recognized that further embodiments of the invention may be used to place an entire insertion set, or the like, beneath the skin, rather than just a portion of the insertion set. As discussed, preferred embodiments of the insertion device are designed to accommodate off-the-shelf insertion sets, or the like. But, alternative embodiments may be used with customized insertion sets, or the like that have been altered to fit the insertion device in a particular orientation or configuration to improve safety and/or assure proper placement of the insertion set, or the like. In still other embodiments, the insertion sets, or the like may be angled and the devices are capable of insertion at angles between 0 and 90 degrees relative to the skin surface after insertion of the insertion set.
• In preferred embodiments, the insertion set includes at least one piercing member to pierce the skin during insertion. In particular embodiments, the piercing member is a metal needle. In alternative embodiments, the needle may be hollow, solid, half needle (or other fraction), or the like. In further alternative embodiments, the piercing member may be made out of other materials, such as ceramic, plastic, composites, silicon micro-needles, biodegradable, hydrophillic substances, substances that soften and/or change once in contact with the body and/or bodily fluids, or the like. In other alternative embodiments, the insertion set may include more than one piercing member. For example, a single insertion set may include a piercing member for an infusion portion and another piercing member for a separate sensor portion, or the like. Alternatively, the insertion set may include a plurality of small piercing members on a small patch or substrate, such as a series of hollow micro-needles (such as from silicon, plastics, metal or the like) for infusion of a medication or a series of solid micro-needles for sensor applications (such as from silicon, plastics, metal or the like), which micro-needles are used to penetrate the skin.
• As shown in the exemplary drawings, an injector (or insertion device) in accordance with a first embodiment of the present invention is referred to generally by thereference numeral10 is provided for quick and easy transcutaneous placement of a medical needle, particularly such as aninsertion needle12 of the type provided with a subcutaneous insertion set14 as depicted inFIGS. 4 and 7. Theinjector10 includes a trigger-type actuator mechanism for transcutaneous placement of theinsertion needle12 with a controlled speed and force, and with theinsertion needle12 oriented at a desired angular position relative to the skin16 (FIGS. 1 and 9) of the patient.
• Theautomatic injector10 of the present invention, as shown in the illustrative drawings, is particularly designed for placement of theinsertion needle12 of a subcutaneous insertion set14, such as an insertion set of the general type shown and described in U.S. Pat. Nos. 4,755,173; 5,176,662; and 5,257,980, which are incorporated by reference herein. Such insertion sets14 are used to infuse medical fluids such as selected medications to a patient, with one example being the administration of insulin to a diabetic by operation of a programmable medication infusion pump (not shown) of the type described in U.S. Pat. No. 4,685,903. Alternatively, theinjector10 may be used to transcutaneously place a medical needle associated with other types of insertion sets, such as transcutaneous sensor insertion sets of the general type shown and described in U.S. Pat. Nos. 5,390,671; 5,560,806 and 5,586,553, which are also incorporated by reference herein. Such insertion sets are used, for example, to monitoring patient glucose levels.
• As shown best inFIG. 4 with respect to an insertion set14 for infusing medical fluids to a patient, theinsertion needle12 is connected to ahub18 at a rear or proximal end thereof, and protrudes through ahousing20 of the insertion set14, wherein thehousing20 defines an internal chamber (not shown) for receiving medication viainfusion tubing22. An enlarged base, typically in the form of resilient orflexible wings24, is provided on thehousing20 for stable affixation to theskin16 of a patient. Theinsertion needle12 protrudes downwardly through thehousing20 and thewinged base24 to extend through a soft andflexible cannula26. Theinsertion needle12 is provided for transcutaneous placement of thecannula26, after which the insertion needle is retracted from the set14 (FIG. 16) to permit medication delivery through thecannula26 to the patient.
• Theinjector10 of the present invention represents a simple device which can be used by the patient to quickly and easily place the subcutaneous insertion set14 in a proper transcutaneous position and orientation, at a selected medication insertion site. Theinjector10 is designed to project the insertion set toward the patient'sskin16 at a controlled force and speed for quickly piercing the skin in a manner insuring proper placement of theinsertion needle12 andcannula26, while minimizing patient anxiety and/or discomfort. Improper and/or partial placement of theinsertion needle12 is thus avoided.
• In general terms, as shown in one preferred form isFIGS. 1-5, theinjector10 comprises a cylindrical forward barrel28 (or device housing) having a plunger30 (or carrier body) mounted therein for longitudinal sliding movement within a hollow bore between a forward advanced position (FIG. 5) and a rearward retracted position (FIG. 9). Theplunger30 has ahead32 at a forward end thereof for releasibly receiving and retaining the subcutaneous insertion set14, in a manner to be described in more detail. A rear end of theplunger30 cooperates with a trigger-type actuator assembly34 mounted on the rear end of thebarrel28. The trigger actuator assembly34 (or driver) is adapted to hold theplunger30 in a retracted position, against the force of acompressed drive spring36. Atrigger button38 of theactuator assembly34 is adapted for fingertip depression to release theplunger30 for spring-loaded travel toward the advanced position, and corresponding transcutaneous placement of theinsertion needle12 through the patient's skin.
• FIGS. 2-5 illustrate construction details of theinjector barrel28, wherein the forward or nose end thereof defines a flat and generally planar surface for placement against the skin of a patient (FIG. 1) with a longitudinal axis of thebarrel28 oriented generally perpendicular to the patient'sskin16. Thebarrel28 has a size and shape for substantially mated sliding fit reception of the infusion set14, with theinsertion needle12 andrelated cannula26 projecting in a direction for placement on a patient. In this regard, the nose end of thebarrel28 defines an opposed pair of relatively wide and open-endedcut outs40 for slide-fit reception of the oppositely projectingbase wings24. Anarrower slot42 is also formed in the barrel nose end, at a location for slide-fit reception of theinfusion tubing22 attached to the infusion set14. Thus, the forward or nose end of thebarrel28 accommodates sliding reception of the subcutaneous insertion set14 therein for movement along thecut outs40 and theslot42 between the advanced position (FIG. 5) disposed substantially at the forwardmost end of thebarrel28, and the retracted position (FIG. 9) with thebase wings24 andinfusion tubing22 positioned substantially at the inboard ends of thecut outs40 and the associatedslot42.
• Theplunger30 includes thehead32 of generally cylindrical shape for slide-fit reception within theinjector barrel28. A forward end of thehead32 includes acylindrical counterbore recess44 for receiving thehub18 andhousing20 of the insertion set14, with theenlarged base wings24 fitted against a pair of outwardlyprotruding backstop flanges46 adapted for slide-fit reception within thecut outs40 in the barrel nose end. A pair of track arms48 (FIG. 5) protrude rearwardly from theplunger head32 and include out-turnedlatch fingers50 for guided reception within longitudinally extendingtrack slots52 formed in thebarrel28 at a location spaced aft from the barrel nose end. Thesetrack arms48 thus cooperate with thebarrel track slots52 to guide theplunger30 between the advanced position (FIGS. 5 and 7) and the retracted position (FIG. 9).
• Theplunger30 also includes a central drive stem54 (FIG. 5) which protrudes rearwardly from theplunger head32 within the barrel interior. The rearward end of thedrive stem54 is longitudinally split to define a pair oftrigger arms56 which have out-turnedtrigger fingers58 on the rearward ends thereof.
• The trigger-type actuator assembly34 is mounted on the rearward end of theinjector barrel28, and generally functions to releasibly retain theplunger30 in a retracted and cocked position, ready for rapid and spring-loaded actuation upon depression of thetrigger button38 to place the insertion set14 on the patient. More particularly, as shown best inFIGS. 5-9, thetrigger assembly34 comprises amain support cap60 having a mountingsleeve62 protruding in a press-fit and preferably adhesively connected manner into the rear or aft end of theinjector barrel28. Thedrive spring36 comprises a coil spring positioned about thedrive stem54 on theplunger30 and reacts between arearward face64 of theplunger head32, and ashoulder66 on thesupport cap60. Thedrive spring36 normally biases theplunger30 toward the advanced position (FIGS. 5 and 7). However, an insertion set14 seated in theplunger head32 can be pressed rearwardly against theplunger30 to move the plunger to the retracted position, as viewed inFIG. 9, with thetrigger fingers58 passed through a conical or tapered latch bore68 formed in thesupport cap60 to engaging ashoulder70 on an opposite side of thesupport cap60. In this regard, thetrigger fingers58 have ramped outboard faces to accommodate movement of thefingers58 radially toward each other as they pass through the latch bore68. When thetrigger fingers58 pass entirely through thebore68, the spring resilience of thetrigger arms56 is sufficient to spread thetrigger fingers58 so that they engage theshoulder70. In this retracted plunger position, thedrive spring36 is retained in a compressed and cocked condition, with the insertion set14 including theinsertion needle12 andrelated cannula26 withdrawn into the interior of thebarrel28, in spaced relation to the patient'sskin16.
• Thetrigger actuator assembly34 additionally includes anactuator pin72 mounted within a noncircular bore74 (FIGS. 6 and 7) formed in thesupport cap60 for longitudinal sliding movement through a short stroke, relative to theplunger30. In this regard, theactuator pin72 includes one or morenoncircular lands76 for slide-fit reception within thebore74, to prevent actuator pin rotation therein. Theactuator pin72 is held within thebore74 by a steppedlock ring78 which is retained against a rearward end of thesupport cap60 by a press-fitouter retainer sleeve80 having aninturned rim82 at the rearward end thereof Importantly, as shown best inFIG. 8, anoblong land84 is formed on theactuator pin72 for mated slide-fit reception through anoblong recess85 formed in thelock ring78. A return spring86 (FIG. 7) is carried within the support cap bore74 and reacts between theshoulder70 and a nose end of theactuator pin80 for biasing theactuator pin80 rearwardly within the support cap.
• The rearmost end of theactuator pin72 defines thetrigger button38. As shown inFIGS. 11 and 13, thetrigger button38 can be depressed with a fingertip to move theactuator pin72 through a short stroke against thereturn spring86 in a direction toward thetrigger fingers58 at the rear end of theplunger30. As shown best inFIG. 13, theactuator pin72 has a hollowed cylindricalforward tip88 with a diametric size for engaging and squeezing thetrigger fingers58 together at the rear end of theplunger30, in a manner enabling thosetrigger fingers58 to pass back through the tapered conical latch bore68. As soon as thetrigger fingers58 thus release from engagement with theshoulder70 on thesupport cap60, thedrive spring36 translates theplunger30 with the insertion set14 thereon with a rapid and controlled force and speed toward the advanced position, resulting in transcutaneous placement of theneedle12 andcannula26, as viewed inFIG. 15. Importantly, the spring rate characteristics of thedrive spring36 and the distance of plunger stroke are chosen for a substantially optimized and proper transcutaneous placement of theneedle12 andcannula26, all in a manner which minimizes patient discomfort during the needle placement procedure. Moreover, by forming the nose end of theinjector barrel28 with a squared-off shape as shown, theinjector10 can be easily oriented substantially perpendicular to theskin16 for proper placement of the insertion set.
• Depression of theactuator pin72 by means of thetrigger button38 requires thelock ring78 to be rotatably oriented in a position aligning theoblong recess85 therein with theoblong land84 on the actuator pin. Accordingly, when these oblong structures are rotationally aligned (FIGS. 13-14), theinjector10 is armed for trigger button depression and corresponding release of the retracted and cocked plunger. However, thelock ring78 can be rotated relative to theactuator pin72 to misalign these oblong structures, as shown inFIGS. 9-12, whereupon theactuator pin72 is locked in a rearward position against depression and actuation. Aset pin90 on thelock ring78 may be provided and received within anaccurate notch92 formed in the retainersleeve flange rim82, to permit lock ring rotation back-and-forth through a part circle increment, on the order of about 90 degrees. Appropriate indicia may be applied to theretainer sleeve rim82, such as the letter “L” for “locked” and the letter “A” for “armed”, as viewed inFIGS. 12 and 14, to provide a visual indication of the setting of thetrigger assembly34.
• In accordance with one aspect of the invention, theplunger head32 additionally includes a safety lock mechanism in the form of a pair ofsafety lock arms94 pivotally carried innarrow slots96 formed in theplunger head32. These safety lockarms94 have rearward ends connected to thehead30 bypivot pins98, and forward ends defining contouredlock fingers100 which protrude into theplunger head recess44. As shown inFIG. 7, thesafety lock arms94 and their associatedlock fingers100 have a size and shape so that thefingers100 can engage and retain thehub18 of the insertion set14, for example, by fitting into arecess101 defined between thehub18 andhousing20 of the insertion set. Importantly, the locations of the lock arm pivot points are chosen to insure that thelock arms94 engage and retain the insertion set14 whenever theplunger30 is moved from the advanced position (FIG. 7) toward and to the retracted position (FIG. 9). When theplunger30 reaches the filly advanced position, thesafety lock arms94 including their respective pivot pins98 are disposed within thewide cut outs40 and are therefore free to swing outwardly, relative to the insertion set14, to accommodate separation of the insertion set from theinjector10 with a substantially minimum separation force. This configuration has been found to be highly effective as a safeguard to prevent the insertion set14 from being thrown as a projectile from theinjector10, in the event that thetrigger assembly34 is activated without prior placement of theinjector10 firmly against the patient'sskin16. In use, the subcutaneous insertion set14 can be placed quickly and easily into the open nose end of theinjector barrel28, within therecess44 formed in theplunger head32. Such assembly of the insertion set14 with theinjector10 requires simple alignment of thebase wings24 andinfusion tubing22 with the appropriate cut outs andslots40,42 formed in the nose end of thebarrel28. The insertion set14 andplunger30 can then be manually retracted rearwardly, against thedrive spring36, to the retracted position with theplunger30 cocked and latched as viewed inFIGS. 9 and 11. Theinjector10 can then be placed firmly against the patient'sskin16, with the insertion set14 supported in the proper orientation and at a predetermined distance from theskin16. Simple depression of thetrigger button38 releases the cockedplunger30 for spring-loaded travel rapidly albeit with a controlled speed and force of insertion, to ensure penetration of the patient's skin with minimal discomfort, and in a manner which properly places the insertion needle and cannula. Thesafety lock arms94 prevent accidental projection of the insertion set14 through free space, in the event that thetrigger button38 is prematurely depressed. When the insertion set14 is properly placed, however, thesafety lock arms94 release from the insertion set with minimal force, for easy separation of theinjector10 from the insertion set14.
• In preferred embodiments, the controlled speed and force of the insertion device is obtained by selecting a spring constant of a spring to propel and insert the insertion set at the proper speed and force to ensure penetration with minimal discomfort. In alternative embodiments, as shown inFIGS. 48a-48d,there is the need to vary the speed and force, from one insertion cycle to the next, to accommodate different insertion sets (such as finer needles, sensor sets fragility or the like) and insertion site conditions (such as overweight, underweight, children or the like). As shown inFIG. 48a,aforce changing mechanism1000 having aspring1002 enclosed in a sealedcompartment1004 is used with a set (or adjustable)orifice1006 to allow equalization of internal and ambient pressures during the insertion stroke of the insertion device. The sealedcompartment1004 includes sealing O-rings1008 and1010 to seal the sealedcompartment1004. The O-ring1008 seals the insertionset carrier body1012, and the O-ring1010 seals the actuator housing1014 (which contains the orifice1006) of theforce generating mechanism1000. Theforce changing mechanism1000 may be activated by, for example, atrigger1016 that is biased by aspring1018 to close off theorifice1006 until depressed. The limiting flow through theoffice1006 acts as a dampening force, counteracting the spring force from thespring1002, thereby allowing control of insertion speed and force. The orifice size can be adjustably attained through a number of approaches, such asbearing1020 andspring1022 that blocks theorifice1006 and resists air flow based on the tension of thespring1022 on the bearing1020 (seeFIG. 48b); while presenting a lower resistance during retraction as the air contained in the sealedcompartment1004 is compressed, forcingbearing1020 againstspring1022 to unseat thebearing1022 from theorifice1006 to present the maximum orifice size for escaping air during compression ofspring1002. This structure minimizes the force needed to compressspring1022 by allowing air in the sealedcompartment1004 to escape freely and quickly through theorifice1006; rather than be compressed within the sealedcompartment1004 because theorifice1006 is restricted by bearing1002. In another alternative, as shown inFIG. 48c,adisk1024 has a plurality of various sized holes1026(1) to1026(n). Thedisk1024 is rotateable over theorifice1006 to sequentially obstruct, completely obstruct or partially obstruct theorifice1006 flow path and changes the effective size of theorifice1006 by blocking theorifice1006 with the various sized holes1026(1) through1026(n). In another embodiment, as shown inFIG. 48d,atapered valve plug1028 is threaded into position relative to theorifice1006 to change the effective size of theorifice1006.Other orifice1006 size changing methods may be used. In addition, other methods of controlling the insertion speed and force may be used, such as controlled friction, change in spring tension, hydraulics, pneumatics or the like may be used.
• Following separation of theinjector10 from the placed insertion set14, theinsertion needle12 can be withdrawn quickly and easily from the cannula as viewed inFIG. 16. Thereafter, the insertion set14 can be used in a normal manner to deliver a selected medication through theinfusion tubing22 andcannula26 to the patient.
• An alternative preferred form of the invention is shown inFIGS. 17-29, wherein components corresponding in structure and function to those described previously with respect toFIGS. 1-16 are identified by common reference numerals increased by100. The embodiment ofFIGS. 17-29 show amodified injector110 constructed from a reduced number of parts and including an alternative safety lock mechanism for preventing undesired projection of the insertion set14 through free space in the event of injector operation without placing the nose end thereof firmly against theskin16 of a patient. However, the alternative safety lock mechanism again permits quick and easy separation of theinjector110 from the insertion set14, with minimal separation force. Once again, although an insertion set for infusing medical fluids to a patient will be shown and described, it will be understood that alternative insertion sets such as transcutaneous sensor insertion sets and the like as previously referenced herein may be used with theinjector110.
• In general, the modifiedinjector110 comprises aplunger130 and a trigger-type actuator134 assembled with a generally cylindricalhollow barrel128. Theplunger130 has a generallycylindrical plunger head132 which defines acounterbore recess144 for receiving and retaining thehub18 of the infusion set14. As shown best inFIGS. 27-29, a radially inwardly projectingrim202 is formed on theplunger head132 generally at a leading or nose end of therecess144, wherein thisrim202 has a noncircular and preferably oval or elliptical shape (FIG. 28) to accommodate reception of thehub18 into therecess144 provided that thehub18 is oriented angularly relative to a central longitudinal axis of theplunger130 andbarrel128. Similar angular orientation of these components accommodates quick and easy separation thereof. However, when the insertion set14 is oriented with themedical needle12 aligned coaxially with the barrel center axis, a portion of therim202 projects into theinsertion set recess101 to prevent release of the insertion set14 from theinjector110.
• More specifically, with reference toFIGS. 17-20, thebarrel128 again has a forward or nose end defining a flat and generally planar surface for firm placement against the skin of a patient. The nose end of thebarrel128 has a pair of relatively wide and generally opposed cutouts140 formed therein for slide-fit reception of thebase wings24 of the insertion set14, in combination with anarrower slot142 for slide-fit reception of theinfusion tubing22. Thisslot142 may be formed in one or both sides of the barrel nose end.
• Theplunger130 is slidably fitted into thebarrel128 for movement between an advanced position shown inFIGS. 17, 18,20 and21, and a retracted position shown inFIG. 23. Theplunger130 includes the modifiedplunger head132 of generally cylindrical shape, formed preferably to include a shallow notch or groove133 in one side thereof for slide-fit reception of theinfusion tubing22 on the insertion set14. In this regard, theplunger head groove133 is formed in a position aligned with thenarrow slot142 in the nose end of the barrel.
• Theplunger head132 is formed integrally with adrive stem154 which projects rearwardly within the barrel interior. As shown best inFIG. 22, thedrive stem154 is flanked by and formed integrally with a pair of rearwardly projectingtrack arms148 which havelatch fingers150 formed at the rear ends thereof. As shown inFIGS. 21 and 23, theselatch fingers150 are received slidably within longitudinally extendingtrack slots152 formed in thebarrel128, and function to guide theplunger130 between the advanced and retracted positions. Cushioning material (not shown) may be included at the leading ends of thetrack slots152 to form a combined stop upon spring driver advancing motion of theplunger130, as will be described.
• Theplunger130 additionally includes a pair oftrigger arms156 which project generally rearwardly from a rear end of thedrive stem154 and have out-turnedtrigger fingers158 at the rear ends thereof (FIG. 22). Thesetrigger fingers158 are adapted and sized for partial radial compression toward each other as they ride within the barrel base when theplunger130 is displaced from the advanced position (FIG. 21) to the retracted position (FIG. 23). As the retracted position is reached, thetrigger fingers158 are spring-loaded by the resiliency of thetrigger arms156 to move outwardly for partial reception into relativelyshort trigger slots159 formed in thebarrel128. In this position, as shown inFIG. 23, thetriggers fingers158 retain theplunger130 in the retracted position.
• Adrive spring136 is mounted within thebarrel128 to react between the trigger-type actuator134 and theplunger130, in the same manner as previously described with respect toFIGS. 1-16. In this regard, thetrigger actuator134 comprises a generallycylindrical actuator sleeve188 mounted slidably within thebarrel128 at the rear or upper end thereof. Thisactuator sleeve188 has a tapered or ramped leadingedge face188′ (FIGS. 22, 23 and25) for engaging matingly shaped ramped outer faces of thetrigger fingers158, to radially compress thetrigger arms156 and release theplunger130 for spring-loaded travel from the retracted and cocked position to the advanced position. Atrigger button138 is formed integrally with theactuator sleeve188 and is exposed for fingertip depression at the rear or top of thebarrel128 to move theactuator sleeve188 into releasing engagement with thetrigger fingers158.
• As shown best inFIGS. 22 and 24-26, thetriggers button138 extends through an opening formed in the rear of thebarrel128, generally within alock sleeve178 formed integrally with thebarrel128. Thelock sleeve178 defines an oppositely formed pair ofguide slots192 for aligned reception of a pair of outwardly radiatinglock tabs184 formed on thetrigger button138. When thetabs184 and rotationally aligned with theguide slots192, thetrigger button138 can be depressed to actuate the spring-locked plunger, as described. However, thelock tabs184 have sufficient length to permit fingertip rotation of theactuator134 to re-position thetabs184 withinshallow lock grooves193 formed adjacent theguide slots192. When thetabs184 are seated in thelock grooves193, thelock sleeve178 blocks depression of thetriggers button138 and thereby locks theinjector110 against actuation. Return rotation of theactuation134 to re-align thetabs184 with theguide slots192 is required before the injector can be activated.
• In accordance with one aspect of the invention, theplunger head132 includes the safety lock mechanism in the form of thenoncircular rim202 at the leading end of therecess144 in the plunger head. As shown inFIGS. 27 and 28, therim202 has a generally elliptical shape defining a major axis that is greater than the diameter of thehub18 on the insertion set14, and a minor axis that is less than the hub diameter. With this geometry, and by providing sufficient axial depth to theplunger head recess144, thehub18 can be fitted into the plunger head by angularly orienting the components to permit slide-fit of thehub18 through the major axis portion of therim202. Subsequent re-orientation of the components to align themedical needle12 generally coaxially withplunger head32 enables the minor axis portion of therim202 to project into theinsertion set recess101, thereby locking the components together. Thereafter, when the insertion set14 is placed on the patient (FIG. 29), the components are easily separated by lifting theinjector110 off the insertion set14 at the same angle to allow thehub18 to press freely through the major axis center of therim202. Importantly, such engagement and disengagement of the components occurs with essentially no resistance force to separation. The infusion set14 can be oriented angularly relative to theplunger130 only when the plunger is in the advanced position, with theadjacent barrel128 precluding such angular orientation when theplunger130 is moved rearwardly from the restricted position.
• In an alternative mode of operation, subsequent to actuation of theinjector110 to place the insertion set14 of the patient, theinjector110 can be simply withdrawn or retracted in a direction away from the patient'sskin16, in which case therim202 at the nose end of theplunger head132 will engage theneedle hub18 and thereby gently withdraw themedical needle12 from the insertion set14, In this manner, theneedle12 is retracted from thecannula26 which remains at the desired transcutaneous insertion site.
• A further alternative preferred form of the invention is shown inFIGS. 30-34, wherein a further modifiedinjector210 is constructed and operated generally as shown and described inFIGS. 17-29, but wherein an alternative configuration for aplunger head232 is provided.FIGS. 30-32 show theinjector210 with theplunger head232 in the advanced position within the front or nose end of thebarrel128 which includes thewide cut outs140 and thenarrow slot142 for respective slide-fit reception of thebase wings24 and thetubing22 of the insertion set14. As shown, the modifiedplunger head232 has a laterallyopen recess244 formed therein of undercut geometry and laterally exposed through thecut outs140 when the plunger is in the advanced position. The insertion set14 can be slide-fit assembled with theplunger head232, by fitting thehub18 into the wider upper region of therecess144, with aninturned rim302 at the leading end of the plunger head fitting into theinsertion set recess101. A laterally open gap303 (FIG. 34) in therim302 permits slide-fit reception of thehub18 into therecess244, and a short carrier post304 (FIG. 32) may be provided at the base of therecess244 to seat within a shallow detent in the top of the hub.
• With the insertion set14 assembled with theplunger head232, as viewed inFIG. 32, the plunger can be retracted and cocked as previously shown and described with respect toFIGS. 17-29. Thecut outs140 and slot142 accommodate sliding movement of the insertion set14 with theplunger232 during such retraction. Thereafter, the front or nose end of theinjector210 can be placed firmly against the patient's skin (FIG. 33) and thetrigger button138 depressed to release the plunger so that themedical needle12 is transcutaneously placed with the controlled drive force and speed. During forward drive motion of the plunger, theforward rim302 on theplunger head232 prevents projectile release of the insertion set. After placement of the insertion set on the patient, theinjector210 can be laterally displaced relative to the insertion set for quick and easy separation therefrom. Alternately, as viewed inFIG. 34, theinjector210 can be withdrawn or retracted from the insertion set14 to slidably withdraw themedical needle12 while leaving the insertion set in place on the patient.
• FIGS. 35-40gillustrate aninsertion device500 in accordance with a second embodiment of the present invention. Theinsertion device500 includes a barrel502 (or device housing) having asurface seat501 and anassembly port503, a carrier body504 (or plunger or the like) having anassembly rim505 and aseating flange506, a drive spring507 (or driver), arelease button508, and dual spring triggers510 and512. As shown inFIG. 35, thebarrel502 performs as a housing to hold thecarrier body504. Thecarrier body504 is connected to thebarrel502 by the carrier body being inserted through an opening in thesurface seat501 of thebarrel502, and then passing theassembly rim505 of thecarrier body504 through theassembly port503 of thebarrel502. The section of thecarrier body504 with theassembly rim505 compresses slightly, as it passes through theassembly port503, due to the presence ofcompression slots509, and then essentially restores to its original shape to prevent thecarrier body504 from sliding out of thebarrel502, since theassembly rim505 of the carrier body engages with theassembly port503 of thebarrel502.
• Thecarrier body504 is driven to an advanced position from a retracted position by thedrive spring507 and held in the retracted position (or released to move to the advanced position) by thetrigger buttons510 and512. This embodiment of theinsertion device500 is primarily adapted for insertion of insertion sets400 (as exemplary shown inFIG. 39 as an infusion set), or the like, that are inserted with the piercing member402 (or needle) at 90 degrees (or perpendicular) to the skin surface after insertion. In preferred embodiments, thecarrier body504 is permanently coupled to thebarrel502 and new insertion sets400 are attached to thecarrier body504 for each new insertion. However, in alternative embodiments, thecarrier body504 may be a disposable that is replaced after each insertion so that, for instance, acarrier body504 may be shipped with a pre-installed insertion set400 and then loaded into thebarrel502 of theinsertion device500.
• Theinsertion device500 features a low profile compact package that tends to minimize the effects of hand movement during insertion of the insertion set400. In this embodiment, therelease button508 is depressed to release the insertion set400, or the like, from thecarrier body504 of theinsertion device500; rather than engaging or disengaging the insertion set14 using a lateral slot as shown inFIGS. 31-34 above. Therelease button508 can be used before or after insertion of the insertion set400, or the like. To facilitate insertion of aninsertion set400, or the like, theinsertion device500 utilizesdual trigger buttons510 and512, which provide an extra margin of safety and substantially prevents accidental activation of theinsertion device500 upon contact with the skin surface. This obviates the need for a lock and unlock position on the activation buttons (or triggers) of the earlier insertion devices shown inFIGS. 1-34. Theinsertion device500 also includes another rim on thecarrier body504 that forms theseating flange506 to hold a rim404 (or wing) of the insertion set400, or the like, that carries an adhesive406 for adhering the insertion set400 to the surface of the skin. Upon activation of theinsertion device500 to move the carrier body to the advanced position, theseating flange506 presses the adhesive406 andrim404 of the insertion set400 firmly against the skin surface to provide positive seating and attachment of the insertion set400 to the skin. This may make it unnecessary to require placement of an additional adhesive patch prior to or after inserting an insertion set400 to secure the insertion set400 at the insertion site. Theinsertion device500 further includes an automatic release of the piercing member (or needle)hub408 and piercing member402 (or needle) from the insertion set400, or the like, after the insertion set400, or the like, has been inserted. This permits the insertion set400 to be left on the skin surface without the piercingmember hub408 and piercing member402 (or needle) remaining by simply removing theinsertion device500 from the skin surface. This automatic release feature also minimizes potential patient contact with the piercing member402 (or needle) of the insertion set400, or the like.
• In preferred embodiments, the insertion set400, or the like, is adapted to tightly fit within a cavity514 (or receiving structure) of thecarrier body504. Thecavity514 of thecarrier body504 includesguides516 to orient the insertion set in a particular orientation and anexpansion member518 in the center bottom interior of thecavity514 of thecarrier body504 to engage with the piercing member hub408 (or needle hub) of the insertion set400, or the like. The piercingmember hub408 of the insertion set400, or the like, includes acenter section410 that engages with theexpansion member518 with a slight interference fit. The interference fit expands thecenter section410 of the piercingmember hub408 slightly to expand and press the piercingmember hub408 against the sides of thecavity514 of thecarrier body504 to firmly secure the insertion set400, or the like, within thecavity514 of thecarrier body504. The tight fit of the insertion set400, or the like, in thecarrier body504 substantially prevents the insertion set400, or the like, from being dislodged when theinsertion device500 is activated to improve insertion of the insertion set400, or the like, on the skin. However, the tight fit also prevents the insertion set400, or the like, from being ejected if theinsertion device500 is inadvertently activated when it is not pressed against the skin surface. In preferred embodiments, theinsertion device500 is configured to haveguides516 and anexpansion member518 to work with existing insertion sets400, or the like. However, in alternative embodiments, the insertion set400, or the like, may be modified to have a piercing member base, housing or the like that includes slots (not shown) for receiving guides and expanding members of theinsertion device500 to improve the connection between theinsertion device500 and the insertion set400, or the like. In further alternative embodiments, the guides and expansion members may be formed on the insertion set400, or the like, and the corresponding guide slots and expanding sections may be formed on theinsertion device500.
• The illustrated embodiment employs a dual trigger activation structure to minimize the ability of theinsertion device500 to be unintentionally activated. As illustrated, thebarrel502 of theinsertion device500 includes two outwardly extendingguide channels520 and522 on the side of thebarrel502. Theguide channels520 and522 extend from thebase524 of thebarrel502 up toportal openings526 and528 in the side of thebarrel502. Thedual trigger buttons510 and512 are carried on opposite sides of theseating flange506 at the end of thecarrier body504. Eachtrigger button510 and512 is biased outward from the side of theseating flange506 by atrigger spring530 and532 between the end of thetrigger buttons510 and512 and the side of theseating flange506. When thecarrier body504 of theinsertion device500 is locked in the firing position (or retracted position), thetrigger buttons510 and512 are pushed out by the trigger springs530 and532 to extend out of theportal openings526 and528. In this position, thetrigger buttons510 and512 extend beyond the bottom of theguide channels520 and522, which prevents thetrigger buttons510 and512 from moving down theguide channels520 and522. To activate theinsertion device500, the user must depress both triggerbuttons510 and512 so that thetrigger buttons510 and512 can then slide along the bottom of theguide channels520 and522, which in turn allows thecarrier body504 to move down along thebarrel502 until the insertion set400, or the like, is inserted. In preferred embodiments, theportal openings526 and528 and the end of theguide channels520 and522 terminating at theportal openings526 and528 are rounded to match the shape of thetrigger buttons510 and512. This tends to minimize the resisting pressure on thetrigger buttons510 and512 during depression of thetrigger buttons510 and512. However, in alternative embodiments other portal opening and guide channel end shapes, such as beveled, squared, polygonal, or the like, may be used.
• The end of thecarrier body504 having theassembly rim505 is connected to arelease button508 that can be depressed or slightly extended relative to thecarrier body504. Therelease button508 includesengagement tabs550 and lock teeth552 (seeFIGS. 35 and 36) that engage withcarrier slots554 and carrier locks556 (seeFIGS. 36 and 38) to lock therelease button508 to thecarrier body504. Thelock teeth552 engage with the carrier locks556 (seeFIGS. 36 and 38) to permit an amount of movement of thelock teeth552 along the carrier locks556 to allow therelease button508 to be depressed to release an insertion set from thecarrier body504. Therelease button508 is also slightly extended away from thecarrier body504 when aninsertion set400 is placed in theinterior cavity514 of thecarrier body504 to permit seating of the insertion set400. Engaging therelease button508 with the carrier body substantially prevents thecompression slots509 and assembly rim505 from compression and inhibits release of thecarrier body504 from thebarrel502 of theinsertion device500.
• Therelease button508 is depressed to release the insertion set400, or the like, from thecarrier body504 of theinsertion device500. Therelease button508 pushes the insertion set400, or the like, out of thecavity514 of thecarrier body504 sufficiently enough to release the insertion set400, or the like, from theguides516 and the expandingmember518 in thecavity514 and leave the inserted insertion set400, or the like, on the skin. Alternatively, therelease button508 may be activated to release aninsertion set400, or the like, from thecarrier body504 prior to the insertion set400, or the like, being inserted by theinsertion device500. Therelease button508 also includes a ramp portion534 (or other trigger mechanism) that is adapted to bend or adjust the piercing member hub408 (or needle hub) of the insertion set400, or the like, to allow the piercingmember hub408 and piercing member402 (or needle) to be released and separated from the insertion set400, or the like, when the insertion set400, or the like, has been inserted and theinsertion device500 is lifted off the skin. This can be accomplished by separating the elements of the insertion set400, or the like, so that only the insertion set, or the like, housing and tubing (or wiring or the like) are left in contact with the skin. The ability to remove the piercingmember hub408 and piercingmember402 is preferably facilitated by the adhesive406 of the insertion set400, or the like, that attaches to the skin to provide sufficient tension to allow for separation of the piercingmember hub408 and the piercingmember402 from the rest of the insertion set400, or the like, without dislodging the insertion set400, or the like. In preferred embodiments, theinsertion device500 is adapted to work with an existing piercingmember hub408 on aninsertion set400, or the like. However, in alternative embodiments, the piercingmember hub408 and the connection between the piercingmember hub408 and the insertion set housing, or the like, is modified to work with the release mechanism of theinsertion device500.
• In preferred embodiments, therelease button508 is biased in position by a plastic or metal spring. However, in alternative embodiments, therelease button508 may be manually reset by engaging and disengaging detents or using other elastomeric materials to bias therelease button508 in position relative to thebarrel502 and thecarrier body504. In preferred embodiments, pulling up the release button508 (or extending it away from theassembly port503 of the barrel502) pulls thecarrier body504 to the retracted position in thebarrel502, where it is locked in place bytriggers510 and512 engaging theportal openings526 and528. This procedure separates the piercingmember hub408 and piercingmember402 from the housing of the insertion set400, or the like. This has the advantage of removing the piercingmember402 and piercingmember hub408 to minimize the opportunity of a user being stuck by the piercingmember402.
• FIGS. 40a-40gillustrate one method of insertion of aninsertion set400 with theinsertion device500 in accordance with an embodiment of the present invention. The user first cleans and sterilizes an insertion site on the skin. Next, the user makes sure theinsertion device500 has thecarrier body504 in the advanced position to avoid unintentional activation of theinsertion device500 before placement on the skin. As shown inFIG. 40a,the user places the insertion set400 in thecavity514 of the carrier body by aligning the tubing (or wire leads or the like) with theslot536 in thecarrier body504 and theslot538 in thebarrel502 of theinsertion device500. The user presses against the piercing member guard414 (or needle guard) to seat the piercing member hub408 (or needle hub) and the insertion set400 in thecavity514 of thecarrier body504. As shown inFIG. 40b,the user removes theadhesive backing416 covering the adhesive406 on therim404 of the insertion set400. It is preferred that the piercingmember guard414 is not removed at this point to avoid unintentional sticks by the piercingmember402, and minimize or avoid contact with the adhesive406. As shown inFIG. 40c,the user presses against the piercingmember guard414 to move thecarrier body504 from the advance position to the retracted position, at which point thetrigger buttons510 and512 will extend out of theportal openings526 and528 to extend beyond theguide channels520 and522 to lock thecarrier body504 in the retracted position. Next, as shown inFIG. 40d,the user removes the piercing member guard414 (normally by twisting) to expose the piercingmember402 while maintaining the insertion set400 within thecarrier body504. Then, as shown inFIG. 40e,the user places thesurface seat501 of thebarrel502 of theinsertion device500 with the insertion set400 over the insertion site on the skin. The user depresses the twotrigger buttons510 and512 through theportal openings526 and528 sufficiently for thetrigger buttons510 and512 to slide down along theguide channels520 and522 to insert and install the insertion set400 at the insertion site on the skin. As shown inFIG. 40f, the user depresses therelease button508 to release the insertion set from thecavity514 of thecarrier body504. Finally, as shown inFIG. 40g,the user removes theinsertion device500, while maintaining installation of the insertion set400. In alternative embodiments, the user may extend therelease button508 to lift off the piercingmember hub408 and piercingmember402, and maintain the remainder of the insertion set400 at the insertion site on the skin. If the piercingmember hub408 and piercingmember402 are lifted off the device, the user should re-install the piercingmember guard414 prior to removal of the remaining set from theinsertion device500.
• FIGS. 41-46 illustrate aninsertion device600 in accordance with a third embodiment that is similar to the insertion devices shown inFIGS. 1-34. Theinsertion device600 includes adevice housing end601 and acarrier body602 that has angled insertion contact surfaces603 and604. The angled insertion contact surfaces603 and604 enable the user to properly angle theinsertion device600 to insert aninsertion set700, or the like, at the proper insertion angle relative to the skin. An insertion set similar to the insertion set700 is disclosed in U.S. patent application Ser. No. 08/871,831 (PCT Application Serial No. US98/10832) to Van Antwerp et al. entitled “Disposable Sensor Insertion Assembly” or an insertion set that can be inserted at an angle as disclosed in U.S. patent application Ser. No. 09/034,626 to Funderburk et al. entitled “Medication Infusion Set”, both or which are herein incorporated by reference. Preferred embodiments of theinsertion device600 have angled insertion contact surfaces603 and604 that permit insertion of insertion sets, or the like, that are angled from 89.9 degrees to 25 degrees relative to the skin surface. In further embodiments, the angled insertion contact surfaces603 and604 may handle even shallower angles down to approximately 10 degrees relative to the skin surface.
• The key is the angled insertion contact surfaces603 and604 mirrors the insertion angle of the insertion set700, or the like, so that the piercing member702 (or needle) of the insertion set700, or the like, is in axial alignment in the direction of movement of thecarrier body602 of theinsertion device600. This permits an insertion device designed primarily for use with a 90 degree insertion set, or the like, to be modified to work with angled insertion sets700, or the like, by modification of the angle of the angled insertion contact surfaces603 and604. In addition, it is preferred that the piercingmember702 of the insertion set700, or the like, be slightly off-center from the center axis of thecarrier body602 to permit easy removal of theinsertion device600 once the insertion set700, or the like, has been inserted. Preferred embodiments of the present invention include acarrier body602 with a receiving structure that includes arecess606 and bore608 on one side of thecarrier body602. Therecess606 is adapted to hold the piercingmember hub704 by a slight interference fit and thebore608 is adapted to hold the insertion tubing ortransmitter hub706 of the insertion set700, or the like. In other embodiments for the insertion sets such as infusion sets with tubing (or sensor sets with wire leads already connected to a sensor) thebore608 may be open on one side (not shown) to permit insertion and removal of the infusion tubing (or wire leads), but closed of sufficiently to securely hold and grasp the insertion tubing ortransmitter hub706 that connects the tubing or wire leads to the housing of the insertion set700, or the like.
• FIG. 47 illustrates aninsertion device800 that is adapted for inserting insertion sets, or the like, at angles that are generally less than or equal to 10 degrees relative to the skin surface after insertion of the insertion set, or the like. This embodiment includes a pair ofpinchers802 and804 that grasps the skin. Thepinchers802 and804 pinches (or bunches) up the skin in front of acarrier body806 holding an insertion set, or the like. Once the skin is pinched (or bunched up), the user depresses an activation button and the insertion set, or the like, is inserted into the skin. In alternative embodiments, the user presses thepinchers802 and804 closer together to activate theinsertion device800. After insertion, the user releases thepinchers802 and804 and removes theinsertion device800 from the insertion set, or the like. The effect of this embodiment is to raise the skin so that the actual insertion angle of the piercing member relative to the side of the raised (or pinched) area of skin ranges from 10 degrees to 90 degrees so that the piercing member is inserted in manner similar to the embodiments described above. However, when the pinched skin is released, the piercing member is left in the skin at a shallow angle between 0 and 10 degrees. The amount of pinching and the height of the pinch must be carefully controlled to assure that the insertion set, or the like, is inserted at the proper depth and location in the skin tissue. One example of an insertion set that can be inserted at an angle as disclosed in U.S. patent application Ser. No. 09/034,626 to Funderburk et al. entitled “Medication Infusion Set”, which is herein incorporated by reference.
• While the description above refers to particular embodiments of the present invention, it will be understood that many modifications may be made without departing from the spirit thereof The accompanying claims are intended to cover such modifications as would fall within the true scope and spirit of the present invention.
• The presently disclosed embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims, rather than the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

Claims (19)

1.-37. (canceled)

38. A system for installing a cannula through the skin of a patient, the system comprising:

a piercing member;

a cannula coupled to the piercing member; and

a trigger-type actuator mechanism coupled to the piercing member and the cannula,

wherein the trigger-type actuator mechanism moves the piercing member and the cannula from a retracted position to an advanced position to install the cannula through the skin of the patient,

wherein the cannula is installed to avoid contacting bone, and

wherein the trigger-type actuator mechanism is adapted to remove the piercing member from the patient while maintaining installation of the cannula.

39. A system according toclaim 38, wherein the trigger-type actuator mechanism installs the cannula at a controlled force and speed.

40. A system according toclaim 38, wherein the trigger-type actuator mechanism utilizes a spring to urge the piercing member and the cannula to the advanced position.

41. A system according toclaim 38, wherein the trigger-type actuator mechanism is structured to insert the cannula at a predetermined angle relative to the skin of the patient.

42. A system according toclaim 38, wherein the cannula is installed in the patient's transcutaneous tissue.

43. A system according toclaim 38, wherein the cannula is installed in the patient's subcutaneous tissue.

44. A system according toclaim 38, wherein the piercing member is a needle.

45. A system according toclaim 38, wherein the cannula is coupled to an insertion set.

46. A system according toclaim 38, wherein the piercing member is attached to the trigger-type actuator mechanism.

47. A system for installing a cannula through the skin of a patient, the system comprising:

a piercing member;

a cannula coupled to the piercing member; and

an injector coupled to the piercing member and the cannula,

wherein the injector moves the piercing member and the cannula from a retracted position to an advanced position to install the cannula through the skin of the patient,

wherein the cannula is installed to avoid contacting bone, and

wherein the injector is adapted to remove the piercing member from the patient while maintaining installation of the cannula.

48. A system according toclaim 47, wherein the injector installs the cannula at a controlled force and speed.

49. A system according toclaim 47, wherein the injector utilizes a spring to urge the piercing member and the cannula to the advanced position.

50. A system according toclaim 47, wherein the injector is structured to insert the cannula at a predetermined angle relative to the skin of the patient.

51. A system according toclaim 47, wherein the cannula is installed in the patient's transcutaneous tissue.

52. A system according toclaim 47, wherein the cannula is installed in the patient's subcutaneous tissue.

53. A system according toclaim 47, wherein the piercing member is a needle.

54. A system according toclaim 47, wherein the cannula is coupled to an insertion set.

55. A system according toclaim 47, wherein the piercing member is attached to the injector.

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