Source: http://www.google.com/patents/US20040204687?dq=7,362,867
Timestamp: 2016-05-27 04:46:06
Document Index: 289131144

Matched Legal Cases: ['application no. 98', 'application no. 99', 'arts 219', 'art 219', 'art 219', 'art 219', 'art 219']

Patent US20040204687 - Injector device for placing a subcutaneous infusion set - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inPatentsAn injector device for transcutaneously placing a hollow cannula of a subcutaneous infusion set is disclosed. The injector device includes a plunger slidably received within the device housing for movement between an advanced position and a retracted position, the plunger having an insertion needle secured...http://www.google.com/patents/US20040204687?utm_source=gb-gplus-sharePatent US20040204687 - Injector device for placing a subcutaneous infusion setAdvanced Patent SearchPublication numberUS20040204687 A1Publication typeApplicationApplication numberUS 10/687,568Publication dateOct 14, 2004Filing dateOct 15, 2003Priority dateSep 27, 2001Also published asCA2460637A1, CA2460637C, CN1558782A, CN100406075C, DE60230884D1, EP1429826A1, EP1429826B1, EP1652547A1, US6830562, US8152771, US8162892, US8172805, US20030060781, US20050043687, US20050124936, WO2003026728A1Publication number10687568, 687568, US 2004/0204687 A1, US 2004/204687 A1, US 20040204687 A1, US 20040204687A1, US 2004204687 A1, US 2004204687A1, US-A1-20040204687, US-A1-2004204687, US2004/0204687A1, US2004/204687A1, US20040204687 A1, US20040204687A1, US2004204687 A1, US2004204687A1InventorsLasse Mogensen, Grete Kornerup, Magnus GoranssonOriginal AssigneeMogensen Lasse Wesseltoft, Grete Kornerup, Goransson Magnus WalterExport CitationBiBTeX, EndNote, RefManPatent Citations (99), Referenced by (396), Classifications (10), Legal Events (4) External Links: USPTO, USPTO Assignment, EspacenetInjector device for placing a subcutaneous infusion set
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS [0037] An injector device shown schematically in FIG. 1 by the reference numeral 10 is provided for quick and easy placement of a subcutaneous infusion set 14, and may then be discarded safely. The infusion set 14 with a cannula 26 extending therefrom is shown schematically only. [0038] The injector device 10 includes a plunger 30 having thereon a medical insertion needle 12 with a pointed end 12A. The plunger 30 is arranged for longitudinal sliding movement within a device housing 28 between a forward advanced position (FIGS. 3 and 4) and a rearward retracted position (FIGS. 1 and 2). The device housing 28 may have a circular, square or any desired cross-sectional shape. The device housing 28 and the plunger 30 are preferably formed of a plastics material in a moulding process. [0039] The infusion set 14 is used to infuse medical fluids such as insulin to a patient, and generally includes a housing with an internal chamber (not shown) that receives medication via infusion tubing. An enlarged base 24 of the infusion set 14 is provided on the housing for stable affixation thereof to the skin of the patient. The enlarged base 24 may carry an adhesive and be provided with a release sheet 14′ which is removed to expose the adhesive prior to placement of the infusion set. Alternatively, the base 24 may be sized to allow the infusion set to be fixed to the patient by an adhesive patch. The infusion set has a protruding soft and flexible cannula 26, which communicates with the internal chamber, and a passage sealed by a sealing membrane extends through the housing opposite the cannula 26. The medical insertion needle 12 of the injector device 10 extends through the passage, into the internal chamber and through the cannula 26, when the infusion set 14 is mounted in position on the injector device. After transcutaneous placement of the cannula 26, the injector device 10 with the insertion needle 12 is retracted from the infusion set 14 to permit medication delivery through the cannula 26 to the patient. [0040] Examples of subcutaneous infusion sets suitable for use with the injector device of the present invention, and in particular in conjunction with the insertion needle of the injector device, are shown and described in U.S. Pat. Nos. 4,755,173, 5,176,662 and 5,257,980, European patent no. 956 879 and in international patent application no. 98/58693, which are incorporated by reference herein. Such infusion sets generally include a hollow cannula part. The insertion needle shown in those publications may be obviated through the present invention. Alternatively, the injector device according to the invention may be used to transcutaneously place a cannula associated with other types of infusion sets. [0041] The invention provides a ready to use injector device, which may be molded from a suitable plastics material. An -injector device assembly including the injector device and a subcutaneous infusion set will effectively simplify the placement of an infusion set as the assembly, as delivered from the factory, provides an infusion set already mounted on the insertion needle 12. The time required for the placement of an infusion set is reduced. [0042] The injector device 10 includes a trigger-type actuator mechanism for transcutaneous placement, with a controlled speed and force, of the insertion needle 12 which is secured to the plunger 30, with the insertion needle 12 oriented at an angular position relative to the skin of the patient in principally the manner as shown in international patent application no. 99/33504 incorporated herein by reference. [0043] The plunger 30 has a recessed head 32 (FIG. 3) at a lower or forward end thereof shaped for receiving the housing of the subcutaneous infusion set 14. Centrally in the recess, the head 32 is provided with the metal insertion needle 12, which is securely connected thereto. The insertion needle 12 may connected to the plunger in any suitable manner such as in the process of molding the plunger 30, or the insertion needle 12 may be press-fit in the plunger 30. The recess in the plunger head 32 need not provide support for the infusion set 14 in the sense of providing resistance to removal of the infusion set 14. Such support may be provided solely by the frictional engagement of the insertion needle 12 with the cannula 26 or preferably with the sealing membrane within the internal chamber of the infusion set 14. A rear end of the plunger 30 has a trigger-type actuator assembly 34 cooperating with the rear end of the device housing 28, and includes a stem, which is longitudinal split to define a pair of trigger arms 38 which have out-turned trigger fingers 58 on the sides thereof. The trigger actuator assembly 34 is adapted to hold the plunger 30 in a retracted position, against the force of a compressed helical drive spring 36. The trigger arms 38 of the actuator assembly 34 are adapted for fingertip depression to release the plunger 30 for spring-loaded travel toward the advanced position, and for corresponding transcutaneous placement of the insertion needle 12, and of the cannula 26 travelling therewith, through the patient's skin. In an alternative embodiment, s release of the plunger 30 may be caused by pressing manually on diametrically opposed outside areas of the device housing 28 to deform the housing 28 and thereby effect release of the trigger arms 38. [0044] [0044]FIGS. 1-5 illustrate construction details of the injector device housing 28, lo wherein the lower or nose end thereof defines a flat and generally planar peripheral surface 25 for placement against the skin of a patient with a longitudinal axis of the device housing 28 oriented generally perpendicular to the patient's skin. A hollow bore of the device housing 28 has a size and shape for reception of the infusion set 14, with the insertion needle 12 extending through the cannula 26 and extending together with the cannula 26 in a direction for placement on a patient. A releasable cover sheet 42 (FIGS. 1 and 2) is preferably secured to the device housing 28 at the nose end thereof to indicate the sterility of the infusion set 14. The device housing 28 may also include a narrow slot (not shown) extending parallel with the insertion needle 12 to accommodate slide-fit reception of a coupling element projecting laterally from the infusion set housing for coupling of the infusion set with a pump (not shown), and longitudinally extending track slots 52 (FIG. 3). The plunger 30 includes ribs 50 for guided reception within the track slots 52 formed in the device housing 28 to control the movement of the plunger 30 between the advanced position and the retracted position. The plunger 30 ribs 50 define a surface 51 near the head 32 adapted to cooperate with a peripheral inner edge 29 at the nose end of the device housing 28 to limit movement of the plunger, thereby defining the advanced position of the plunger 30. [0045] Thus, the forward or nose end of the device housing 28 accommodates movement of the subcutaneous infusion set 14 between the retracted position disposed substantially at the rearward most end of the device housing 28, and the advanced position. [0046] As will be understood, the trigger-type actuator assembly 34 generally functions to releasably retain the plunger 30 in the retracted and cocked position, ready for rapid and spring-loaded actuation upon depression of the trigger arms 38 to place the infusion set 14 on the patient. More particularly, the trigger assembly 34 is initially locked against a shoulder 66 formed on the device housing 28 by means of the trigger fingers 58. The drive spring 36 comprises a coil spring positioned about the stem on the plunger 30 and reacts between a rearward face 64 of the plunger head 32, and an internal shoulder 66′ on the device housing 28. The drive spring 36 normally biases the plunger 30 toward the advanced position. During manufacture of the injector device assembly, the infusion set 14 is seated in the recess formed in the plunger head 32, either before or after the plunger 30 is moved to the retracted position. In this retracted plunger position, the drive spring 36 is retained in a compressed and cocked condition, with the cannula 26 of the infusion set 14 being received on the insertion needle 12. The releasable cover sheet 42 is then applied to the device housing 28 at the nose end thereof. [0047] In use of the injector device 10 with the infusion set 14, the cover sheet 42 is first removed and the injector device 10 is placed firmly against the patient's skin, with the infusion set 14 supported in the proper orientation and at a predetermined distance from the skin. A cap 94, which prevents accidental projection of the infusion set 14 by preventing access to the trigger arms 38, is removed. Simple depression of the arms 38 releases the cocked plunger 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 26. [0048] Following placement of the infusion set 14 the injector device with insertion needle 12 is withdrawn quickly and easily from the cannula. Thereafter, the injector device can be discarded and the infusion set 14 can be used in a normal manner to deliver a selected medication through the infusion tubing and cannula 26 to the patient. As shown in FIG. 4, the safety cap 94 may conveniently be adapted to cooperate with an annular recess 33 formed in the head 32 of the plunger 30 for providing protection against the needle 12. [0049] It is noted that the removable cap 94, when sealed to the device housing 28 at the end opposite the plunger head, together with the cover sheet 42 enable the injector device 10 together with the infusion set 14 mounted on the insertion needle 12 to be sterilised in a conventional sterilisation process using e.g. ethylene oxide, where the sterilising agent flows through the membrane formed by the cover sheet 42. By proper choice of the materials used for making the injector device, the injector device may then remain sterile under normal conditions of storage, making any external packaging unnecessary. [0050] An alternative embodiment of the invention is shown schematically in FIGS. 6-12, wherein components corresponding in function to those described previously with respect to FIGS. 1-5 are identified by common reference numerals increased by 100. FIGS. 6-12 serve the purpose of explaining the principles involved in that embodiment, and the figures show schematic, partial cross-sectional views of the injector device. [0051] [0051]FIGS. 6-12 show an injector device assembly including a modified injector device 110 constructed from a reduced number of parts and having an alternative drive mechanism for advancing:the plunger. The modified injector device 110 comprises a generally cylindrical hollow device housing 128, a plunger 130 and a trigger-type actuator 134 formed integrally with the plunger 130. A cover 194, preferably a flexible membrane, covers the top of the injector device 110 and a further cover 142 covers the bottom end of the injector device 110. [0052] The plunger 130 has a generally cylindrical form with a head 132 and a central pin 129 including a metal insertion needle 112 secured thereto in a molding process, by press-fit, or by any other method providing a suitable resistance to loss of the insertion needle during use of the device. The pin 129 stops at a distance from a pair of outwardly turned legs 138′ at the head 132, to accommodate for the infusion set 114 in the head 132 of the plunger 130. The insertion needle 112 extends through the infusion set 114 in a similar manner as described with reference to FIGS. 1-6. An infusion set tubing 113 having a typical length of between about 50 cm and 120 cm and connected to the infusion set 114 is wound up in the lower part of an annular space 115 between the device housing 128 and the plunger 130 to form part of the assembly. [0053] More specifically, the device housing 128 again has a forward or nose end defining a flat and generally planar surface 125 for firm placement against the skin of a patient. The plunger 130 additionally includes a pair of resilient trigger arms 138 which are connected with the pair of outwardly turned legs 138′ and which have out-turned trigger fingers 158 at the sides thereof. The trigger arms 138 are adapted and sized for partial radial compression toward each other as they ride within the device housing when the plunger 130 is displaced from the advanced position (FIG. 6) to the retracted position (FIG. 9). As the retracted position is reached, the trigger arms 138 are spring-loaded by the resiliency to move first inwardly and then outwardly whereby the trigger fingers engage the upper surface of a shoulder 166 of the device housing 128. In this position the trigger fingers 158 retain the plunger 130 in the retracted position. [0054] A drive spring 136 is mounted within the device housing 128 to drive the plunger towards the nose of the device housing in the retracted position of the plunger 130, upon release of the trigger arms 138. The drive spring 136 is formed integrally with the device housing 128 and the plunger 130 in a molding process and may conveniently be: formed of the same plastics material as the plunger 130 and the device housing 128. The spring is shown in closer details in FIG. 12. The spring 136 essentially comprises a number of elongated plastics strips 136, each extending around a respective part of the periphery of the plunger 130, in the annular space 115 between the plunger 130 and the device housing 128. The drawing show an embodiment incorporating two such strips that each extends around about one fourth of the periphery of the plunger 130. Each strip 136 is integrally connected at one end 136″ with the plunger 130 and with the device housing 128 at the other end 136′. In the advanced position of the plunger shown in FIGS. 6-8 and 10-12, the strips 136 are preferably essentially plane and non-deformed. However, when moving the plunger 130 to the retracted position shown in FIG. 9, the strips 136 of the spring are bend, setting up the required force that seeks to drive the plunger 130 towards the nose of the device housing 128. It is noted that this process normally gives rise to a rotational movement of the plunger 130 about its central axis, which is coincident with the insertion needle 112. [0055] Operation of the injector device assembly shown in FIGS. 6-12 is as follows. Since the injector device is preferably delivered to the patient in an uncocked state to simplify the process of manufacture, the plunger 130 must first be moved to the retracted position. To allow for retraction of the plunger 130, the upper cover 194, which spans across the device housing 128 and the lower cover 142 are first removed, as shown in FIG. 7. The lower cover 142 may be hingedly connected to the device housing 128. In this process, the infusion set 114 is exposed with the pointed end 112A of the insertion needle 112 projecting from the end of the soft flexible cannula 126. The infusion set tubing 113 is then connected to a suitable pump, and the infusion set 114 is primed (drop marked 300 in FIG. 8) by allowing medication to exit through the narrow annular space between the cannula 126 and the insertion needle 112 or, if a hollow needle is used, through the needle, as shown in FIG. 18. The injector device 110 is then cocked by displacing the plunger 130 with respect to the device housing 128 as illustrated by the arrow in FIG. 9, until the fingers 158 engage the upper shoulder 166 of the device housing 120 indicating that the injector device is now ready for use. A release sheet 114′ is then removed exposing an adhesive material on the bottom side of the infusion housing 114, and the patient or the nursing personnel then places the injector device on the patient's skin. The plunger 130 is released by application of an inwardly directed manual force on the arms 138 to transcutaneously place the insertion needle 112 and the cannula 126. In an alternative embodiment, release of the plunger 130 may be caused by pressing manually on diametrically opposed outside areas of the device housing 128 to deform the housing 128 and thereby effect release of the trigger arms 138. [0056] The injector device 110 is then removed, leaving the infusion set 114 on the patient's skin, illustrated by reference numeral 116, and the bottom cover 142 is then repositioned at the original place shown in FIG. 11 for protection of the insertion needle 112 which projects partially from the nose end of the device housing 128. [0057] The removable upper cover 194 and the bottom cover 142, when sealed to the device housing 128, allow the injector device 110 together with the infusion set 14 mounted on the insertion needle 112 to be sterilised in a conventional sterilisation process using e.g. ethylene oxide. For this purpose one or both covers 142, 194 may comprise a permeable membrane allowing through-flow of the sterilising agent. By choosing suitable materials, the injector device may then remain sterile for a long time under normal conditions of storage whereby no further packaging is required to ensure sterility of the assembly at the time of use. For this purpose, at least one of the covers, a preferably the upper cover 194, may carry printed indicia relating to the shelf life of the assembly. One suitable material for the permeable membrane is Tyvec™. [0058] [0058]FIGS. 13-16 show a third embodiment of the invention wherein components corresponding in function to those described previously with respect to FIGS. 1-5 are identified by common reference numerals increased by 200. FIGS. 13-16 serve the purpose of explaining the principles involved in that embodiment, and the figures show schematic, partial cross-sectional views of an injector device 210. The injector device 210 is particularly suitable for the placement of a subcutaneous infusion set 214 at an acute angle relative to the skin of a patient. [0059] As best seen in FIG. 13, which shows the injector device in a semi-open state, the injector device 210 has a device housing 228 with a flattened box-like structure with parallel major walls 224, 219, the wall 219 including a frangible area 219′″, see FIG. 16 allowing the wall 219 to be split by manually pulling flap 229 (FIG. 13), thereby forming two separate wall parts 219′, 219″ for a purpose that will be explained later. The housing 228 also includes a front wall 227 at the nose end of the injector device, and a rear wall 280, and opposed parallel side walls 225 frangibly connected to wall part 219′. The injector device 210 is presented to the consumer as a closed, box-shaped item, which may easily be provided with printed text as required. [0060] [0060]FIG. 14 shows the injector device in the same state shown in FIG. 13; however, a part of the walls 224, 227 and 219, as well as wall 225 have been omitted to show the interior of the injector device 210. [0061] The injector device 210 comprises a plunger 230 mounted for longitudinal sliding movement within the box-shaped housing between a rearward retracted position (FIG. 14) and a forward advanced position (FIG. 15). The device housing 228 and the plunger 230 are preferably formed of a plastics material. The device housing 228 may alternatively be manufactured from a blank of rigid cardboard. The plunger 230 has a recessed head 232 (best seen in FIG. 16) at a forward end thereof shaped for receiving the housing of a subcutaneous infusion set 214. Centrally in the recess, the head 232 is provided with a projecting metal insertion needle 212 securely connected thereto. The plunger 230 need not provide support for the infusion set as understood in the sense of providing resistance to removal of the infusion set. Such support may preferably be provided by the frictional engagement of the insertion needle 212 with the infusion set 214. A drive spring 236 positioned behind wall 280 reacts between a rearward faces 264 of the plunger head 232. The drive spring 236 normally biases the plunger 230 toward the advanced position. The front end of the plunger 230 has a trigger button 258 cooperating with the wall 224 of the device housing 28. In the retracted state of the plunger shown in FIG. 14, the trigger button 258 extends through an opening 222 formed in the upper wall 224 of the device housing 228 and aligned for reception of a release tab 220 on the wall 219′, as will be explained. [0062] The trigger button 258 may be adapted for fingertip depression to release the plunger 230 for spring-loaded travel toward the advanced position, and for corresponding transcutaneous placement of the insertion needle 212, and of the cannula 226 travelling therewith, through the patient's skin. Preferably, he button 258 is depressed by pivoting wall part 219′ about line 227′. When the tab 220 formed on the external surface of wall part 219′ is aligned with the slot 220, the trigger button 258 can be depressed to actuate the spring-locked plunger, by manually pressing down wall part 219′. [0063] Before opening the device housing 210, that is, before separating wall 219, 219′ along frangible line 219′″, the assembly is maintained under sterile conditions. A removable cover sheet 294 (FIG. 13) is sealed to wall 224 to cover opening 222. All other walls defining the closed housing 210 being sealed together, the cover sheet 294, when being permeable allows the injector device 210 together with the infusion set 214 mounted on the insertion needle 212 to be sterilised in a conventional sterilisation process using e.g. ethylene oxide, where the -sterilising agent flows through the permeable membrane. [0064] [0064]FIG. 17 shows an example of an infusion set 14 suitable for use with the injector device according to the invention. The infusion set 14 includes a housing 3 with an internal chamber (not shown). The internal chamber receives medication via infusion tubing 113 which may be detachably connected to the housing 3 by any suitable connector 7. The base 24 of the housing 3 may be a flexible sheet of a woven material secured to the housing 3 such as by means of an adhesive and carrying an adhesive covered by a release sheet 14′ which is removed to expose the adhesive prior to placement of the infusion set. The infusion set 14 has a protruding soft and flexible cannula 26, which communicates with the internal chamber. An internal passage which is sealed by a sealing membrane 4 and which is penetrated by the insertion needle of the injector device extends through the housing opposite the cannula 26. [0065] [0065]FIG. 18 shows how priming of the infusion set may be carried out prior to the placement of the infusion set using an injector device with a plunger shown only in part and carrying a hollow insertion needle 12, 112 having a lateral opening 12B, 112B. The medical insertion needle 12, 112 of the injector device extends into the internal chamber 2 of the infusion set 14 and through the cannula 26, 126, when the infusion set 14 is mounted in position on the injector device. Medication 6 is then supplied through tubing 113, into the internal chamber 2. To allow the user to visibly confirm that the internal chamber 2 has been completely filled with medication, the lateral opening 12B, 112B allows the medication to flow into the interior of the needle 12, 112 and to exit through pointed end 12A, 112A. [0066] [0066]FIG. 19 shows in an exploded view a presently preferred embodiment of the injector device assembly In respect to FIGS. 6-12, elements having a similar function are identified by the same numerals increased by 200. [0067] The injector device 310 includes respective removable covers 342, 394, the cover 342 having a hollow for accommodating a part of the insertion needle 312 when the cover 342 is secured to the housing 328, such as by snap engagement with the rim 309 of the housing 328. The cover 342, the housing 328, the plunger 330 and a drive with a spring for advancing the plunger 330 to the advanced position are preferably made of plastics while the cover 394 may be a flexible foil secured to the housing 328 by an adhesive. Preferably, the covers 342, 394 serve as bacterial barriers, the flexible foil 394 being of medical paper. An insertion needle 312 is preferably secured in a stable manner to the plunger 330 of the injection device, such as by press-fitting, the plunger 330 having a narrow central passage wherein an end of the insertion needle 112 is lodged. As will appear, the plunger 330 and the drive may conveniently be formed integrally as a single component in a moulding process. [0068] The ring-shaped housing 328 is flexible in the sense that the application of a manual force against diametrically opposed depressions 303 of fingertip size will give rise to a slight deformation of the housing 328 such that it assumes a slightly oval shape when viewed from above for bringing about a release of the plunger in the retracted position and cause a spring-loaded movement of the plunger 330 towards the advanced position, as will be explained. For maintaining the plunger.330 in the retracted position the housing 328 is provided with two opposed ledges 366. Moreover, the housing 328 is provided with opposed dovetail projections 301 extending along the same general direction as the insertion needle 312 and adapted to connect with complementary recesses in the aforementioned spring, to secure the spring in relation to the housing 328. [0069] The plunger 330 generally includes a head 332, a hub 331 and, opposite the head 332, an enlarged gripping portion 331′ which allows a user to manually pull the plunger 330 to a retracted position. The head 332 preferably carries a marking M representing the place where the 113 tubing exits the infusion set 314 located there under whereby the user can check the orientation of the tubing after placement of the infusion set. The head 332 moreover has a recess 332′ for accommodating the infusion set 326 with cannula 326 through which the insertion needle 312 extends, the infusion set 314 preferably being maintained in position by frictional engagement of the insertion needle 312 with an inside surface of the infusion set 314. The plunger 330 has two opposed rigid walls 306 extending radially outwardly from the hub 331. The walls 306 extend in the axial direction of the device 310, i.e. in the same general direction as the insertion needle 312, and are connected to the aforementioned spring. Moreover, as best seen in FIG. 20d, the walls 306 each carry a lateral projection 307 with a finger 358 which is releasably locked in engagement with a corresponding one of the ledges 366 of the housing 328 by snap action in the retracted position of the plunger 330. The depressions 303 preferably being offset with respect to the ledges 366 by about 90� will cause the opposed ledges 366 to move apart when the aforementioned manual force is applied and the housing 328 assumes an oval shape, thereby bringing the finger 358 on each wall 306 out of engagement with, the corresponding ledge 366. For retaining a proximal part nearmost the infusion set of a tubing 113 (not shown) wound around the plunger 330 in the same general manner shown in FIG. 6, wall 306 has a groove G best seen in FIGS. 21c and d sized to receive a small length of the tubing and to prevent the infusion set 314 from being inadvertently pulled away from the plunger 330 by the user when the tubing is unwound for connection with a medical fluid supply. [0070] The drive which acts to drive the plunger 330 from the retracted position towards the advanced position when the fingers 358 are disengaged comprises a spring including four thin and flexible plastics strips, of which two opposed strips 336A extend about halfway around the plunger 330 at the level of the gripping portion 331′ while two other opposed strips 336B extend about halfway around the plunger 330 at the level of the head 332, as viewed in the advanced and unbiased position of the plunger shown in FIGS. 19 and 20a-e. One end 336′ of one of the strips 336A and one end 336′ of one of the strips 336B is rigidly connected to one of the walls 306, while one end 336′ of the other one of the strips 336A and one end 336′ of the other one of the strips 336B is rigidly connected to the other one of the walls 306. Preferably, the strips 336A and 336B are integrally connected with the walls 306 in a moulding process where the plunger 330 and the spring formed from the strips 336A and 336B is formed in one moulding operation. [0071] The spring also comprises two rigid opposed rigid walls 302 that extend in the axial direction of the device 310 and that are each rigidly connected with the second end 336″ of one of the strips 336A: and the second end 336″ of one of the other strips 336B. The rigid walls 302 are preferably integrally connected with the strips 336A and 336B at the second end thereof. The walls rigid 302 each have an axially extending recess 305 which is complementary with the dovetail projection 301 on the housing 328. When the plunger 330 with the spring is mounted within the housing 328 the dovetail projection 301 is slid into the recess 305 by axial movement; by selecting proper dimensions of the dovetail projection 301, and possibly also by performing this operation at a predetermined temperature, a press-fit may result that prevents subsequent removal of the plunger 330 Alternatively, or additionally, the plunger 330 may be secured using glue, or using a welding process. The two rigid walls 302 of the spring also comprise a respective projection 308 with a lower surface which in the advanced position of the plunger 330 is essentially coplanar with the rim 309 of the housing 328. The projections 308 include a clip-like retainer C for securing a distal part of the tubing wound around the plunger 330, thereby maintaining the tubing in position until unwound by the user. [0072] As will be understood, the walls 302 are fixed in relation to the housing 328, and the strips 336A and 336B, being thin and flexible, define the parts of the spring that undergo a change in shape upon retraction of the plunger 330 and that through this change of shape generate the force acting on the plunger 330 via the connections at the ends 336′ and required to advance the plunger 330 to the advanced position upon disengagement of the fingers 358. The shape of the strips 336A and 336B in the deformed condition when the plunger 330 is held in the retracted position is shown in FIGS. 21a-d. The connection between the strips 336A, 336B and the walls 302, 306 being rigid, in the sense that bending moments arising in the strips 336A, 336B upon retraction of the plunger 330 are transferred to the walls 302, 306, brings about a deformation of the strips 336A, 336B as shown. [0073] It will be understood that the resiliency of the spring is generally defined by the elastic properties of the flexible strips 336A, 336B which should be selected such that the drive is capable of advancing the plunger 330 to the advanced position at least once, following retraction. The spring would normally allow the piston to be retracted several times, and provide the required force for subsequently advancing the plunger 330. However, the device being normally a disposable unit requires the spring to be formed with the capability to only a limited number of times advance the plunger 330 at one given speed, and the spring need not be capable of returning the plunger to the exact original position after several times of use. [0074] As seen best in FIG. 19, the two strips 336B each carry a wall member 304 which provides support for a tubing (not shown) connected to the infusion set 314 and wound around the plunger 330 in the annular space 315 between the plunger 330 and the housing 328. [0075] [0075]FIGS. 22a and 22 b show an injector device without an insertion needle secured to the plunger. [0076] [0076]FIGS. 23a and 23 b show a schematic cross-sectional view through the infusion set 14 of FIG. 17. This preferred infusion set is equally suited for use with or without the injector device described herein. As shown in FIG. 23a, the plastics infusion set housing 3 has an internal chamber including a narrow cylindrical portion 2 and an enlarged cylindrical portion 2′, in an upper part of which is fixed a sealing membrane 4 which may be penetrated by a retractable insertion needle 12 with a pointed end 12A, shown in FIG. 23b, for placing the infusion set 14 on a patient by means of a flexible cannula 26. The cannula 26 has a small diameter tubular portion 26″ and a larger diameter tubular portion 26′ which is press-fit or otherwise secured inside the narrow cylindrical portion 2 of the housing 3 chamber. A plug-like hollow tubular member 1 has a head portion nested in the enlarged cylindrical portion 2′, and a portion 1″ of smaller external diameter which extends into the larger diameter tubular portion 26′ of the cannula, preferably applying a radial pressure against the inside surface of the cannula 26 to thereby secure the cannula in place within the narrow cylindrical portion 2 of the housing 3 chamber. For this purpose, the plug-like hollow tubular member 1 preferably exhibits some resiliency. [0077] The head portion of member 1 has an upper surface bearing tightly against the sealing membrane 4, and has a diameter selected such that an annular passage 2″ is defined between the head portion and the housing 3 wall defining the enlarged cylindrical portion 2′ of the internal chamber. This annular passage is in communication with infusion tubing 113 supplying fluid to the infusion set 14. The head portion of member 1 moreover has a number of radially directed entry ports 1′ of which one is shown in FIG. 23a, thereby allowing fluid to flow from the passage 2″ into the interior of member 1 and further on into the small diameter tubular portion 26″ of the cannula 26′, and into the patient when the infusion set has been secured in place by an adhesive on base 24. The base 24 of the housing 3 may be a flexible sheet of a woven material secured to the housing 3 such as by means of an adhesive and carrying an adhesive covered by a release sheet 14′ which is removed to expose the adhesive prior to placement of the infusion set. [0078] [0078]FIG. 23b shows how the infusion set may be primed prior to placement, when a hollow insertion needle 12, which may be secured to a plunger of the injector device described herein, extends through the cannula 26. The hollow insertion needle 12 has a lateral opening 12B that defines an entry port whereby fluid entering the interior of member 1 through the entry ports 1′ may flow into the interior of the hollow insertion needle 12 and out of the insertion needle 12 at pointed end 12A. For establishing communication, the inside diameter of the portion 1″ of member 1 may as shown be slightly greater than the outside diameter of the insertion needle 12 such that an annular passage is formed allowing fluid to flow from tubing 113 into the insertion needle 12. [0079] A variety of further modifications and improvements to the automatic injector device unit of the present invention will be apparent to persons skilled in the art. Accordingly, no limitation on the invention is intended by way of the foregoing description and accompanying drawings, except as set forth in the appended claims. It is noted that the assembly may, depending on the design, be put on the market as such, i.e. with no further packaging being required. Moreover, the injector device, provided with an insertion needle or not, is not exclusively suited for placing an infusion set but may also be used for placing a transcutaneous glucose sensor. FIG. 24 shows the injector device of FIG. 19 with the opposed sealed covers and with a glucose sensor housing G including a sensor needle N inserted into the patient by an insertion needle which is arranged in the plunger head recess 332′ in lieu of an infusion set. The glucose sensor G may have a connecting cable L wound around the plunger 330 in the same manner as the infusion set tubing described above, or may have ports for connecting the glucose sensor to an external device for recording the glucose level of the patient. 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ClassificationA61M25/06D2, A61M5/158Legal EventsDateCodeEventDescriptionApr 19, 2004ASAssignmentOwner name: UNOMEDICAL A/S, DENMARKFree format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:MOGENSEN, LASSE WESSELTOFT;KORNERUP, GRETE;GORANSSON, MAGNUS WALTER;REEL/FRAME:015221/0933Effective date: 20040316Jan 6, 2011ASAssignmentOwner name: JPMORGAN CHASE BANK, N.A., AS COLLATERAL AGENT, TEFree format text: SECURITY AGREEMENT;ASSIGNOR:UNOMEDICAL A/S;REEL/FRAME:025592/0037Effective date: 20101222Oct 6, 2011ASAssignmentOwner name: JPMORGAN CHASE BANK, N.A., AS COLLATERAL AGENT, TEFree format text: AMENDED AND RESTATED SECURITY AGREEMENT;ASSIGNOR:UNOMEDICAL A/S;REEL/FRAME:027024/0354Effective date: 20110926Sep 23, 2015FPAYFee paymentYear of fee payment: 4RotateOriginal ImageGoogle Home - Sitemap - USPTO Bulk Downloads - Privacy Policy - Terms of Service - About Google Patents - Send FeedbackData provided by IFI CLAIMS Patent Services