Source: https://patents.google.com/patent/WO2004047892A1/en
Timestamp: 2019-05-26 00:20:06
Document Index: 11468283

Matched Legal Cases: ['art 5', 'art 5', 'art 5', 'art 5', 'art 5', 'art. 5', 'art 5', 'art 5', 'art 5']

WO2004047892A1 - Injection apparatus comprising a needle-protecting device - Google Patents
WO2004047892A1
WO2004047892A1 PCT/CH2003/000757 CH0300757W WO2004047892A1 WO 2004047892 A1 WO2004047892 A1 WO 2004047892A1 CH 0300757 W CH0300757 W CH 0300757W WO 2004047892 A1 WO2004047892 A1 WO 2004047892A1
PCT/CH2003/000757
2002-11-25 Priority to CH1986/02 priority Critical
2002-11-25 Priority to CH19862002 priority
2004-06-10 Publication of WO2004047892A1 publication Critical patent/WO2004047892A1/en
Disclosed is a receptacle (50) for an active substance, which is connected to an injection needle (37) and is accommodated inside a sliding sleeve (21) that can be displaced within a housing (16) by means of a driving force. A sleeve-shaped needle-protecting device (17) can be displaced within the housing (16) by means of the force of a spring (18) such that said needle-protecting device (17) slides forward and protrudes past the injection needle (37) in an axial direction when the injection needle (37) is withdrawn from the body tissue. Locking means (35, 38) prevent the needle-protecting device (17) from being able to be manually pushed backward. Said locking means (35, 38) are effective between the needle-protective device (17) and the sliding sleeve (21), the locking mechanism being automatically deactivated when the sliding sleeve (21) is at least approximately back in the retracted position thereof.
Injector with needle guard
The application relates to an apparatus for injecting an active ingredient, with an injection needle, a housing, a container for the active substance, and a syringe plunger for the purpose of Ausschüttens of the active ingredient in the container is displaced, a sliding needle guard relative to the housing.
It is primarily a task of the needle guard to protect people after use of the injection device from accidental injuries through the injection needle. A side effect of the shield is to-the fact that the patient's perceived by many people as unpleasant sight of the injection needle spared. A needle guard of the aforementioned type is known in many embodiments, both in connection with manually operated sprayer as well as in so-called auto-injectors. The document W09714455 describes an auto-injector with a slidable in a housing needle protection sleeve, which bears during the injection to the patient's skin and is biased by a spring so that the needle guard upon withdrawal of the autoinjector pushes relative to this forward and the injection needle covered , Between the shield and the housing effective locking means ensure that the needle shield can not be pushed back again and it can therefore be no unintentional injury from the injection needle. Means for canceling the lock are not disclosed in this document.
It is an object of the present invention to provide a simply constructed and reliably functioning device of the type mentioned slam forward.
This object is inventively achieved in that persists during the skin penetration of the injection needle the needle guard in a relative to the housing substantially constant position, while a spring element is tensioned which the needle guard the needle advances after removal of the injection needle from the skin in a surrounding position. A particular embodiment of the invention is characterized in that the container is accommodated in a sliding sleeve which is displaced in the housing during the skin penetration of a retracted position to an advanced position that the needle guard is automatically locked in its advanced position by locking means, which locking means are arranged and configured to be operatively interposed between the needle guard and the sliding sleeve when the needle guard and the sliding sleeve are in their advanced position and in that means for releasing the locking means are provided, which are effective when the sliding sleeve is at least approximately in its retracted position. The needle guard is not locked so as with many known devices of this kind against the housing, but the sliding sleeve and the means for releasing the lock will only be effective when the sliding sleeve is located at least approximately in their extended position zurückge-. This has the considerable advantage that the injection needle is already back in the housing when the lock is released. Thus, in each operating state of the automatic injector ensures that the injection needle can not be touched unintentionally.
According to a further embodiment of the invention, the comparison show lock-out means comprises at least one of the sliding sleeve arranged substantially axially aligned spring tongue, which with a portion of the needle guard is in its relaxed state an axial stop and the means for releasing the lock have a in the housing arranged, inwardly protruding projection which presses in the retracted position of the sliding sleeve, the spring tongue radially inwardly, such that the part of the sliding sleeve containing the spring tongue can be moved into the region of the needle guard inside. By these measures the auto-injector can be realized, and also takes a relatively small overall length simply and inexpensively.
According to another embodiment of the invention, a spring element is present, which urges the needle shield in its extended position and which is biased by the slider sleeve when this is moved in its advanced position. This has the advantage that the needle protection is pressed in the desired manner only in the direction of the patient's skin when the needle is inserted.
A further embodiment of the invention provides that drive means are present which cause the needle protection sleeve is carried along by the slide when it is out of its advanced position to the retracted position. This makes it unnecessary to manually slide the needle guard after release back into the housing. Moreover, if a return spring is provided, which force acts upon the sliding sleeve towards its retracted position by a restoring both the sliding sleeve and the needle shield automatically assumes the retracted position when the driving force is removed.
An embodiment of the present invention is explained below by way of example with reference to the accompanying closer drawings. In which:
2 shows a longitudinal section through the same auto-injector after the insertion of the injection needle and the pouring out of the medicament, whereby the section plane is opposite to that of Figure 1, offset by 90 °,
3 shows a longitudinal section through the same autoinjector after withdrawing the injection needle, cut in the same plane as the view according to Figure 1, and
4 shows a longitudinal section through the front part of the automatic injector after the syringe back into the starting position and is ready to be removed, cut in the same plane as the view according to Figure 1. The auto-injector consists of two main components, namely, the reservoir portion, in the figures shown on the left, which receives a filled syringe 50 and the power pack, shown in the figures to the right, in which the serving for automatic piercing and pouring out of the syringe parts are brought sub. The two main components are releasably connected together by a bayonet-type connection between a housing 16 and a power-sleeve. 1 In the following description, the side of the autoinjector to which the injection needle 37 is located is referred to as the front.
Based on FIG 1, showing the operative auto-injector, the power pack will now be described first. The parts for the drive of the auto-injector are received in the grip sleeve 14, a display window adjoins the rear end of the 51st The display window 51 is for example made of transparent or translucent material so that the slidably received in the display window 51 display can be bachtet BeO 12 from the outside. The display 12 allows the user to track the process of Ausschüttens the drug visually. At the rear end of the autoinjector of the operating head 13 is arranged, which is provided on its rear end side with a cover 15 °. Within the grip sleeve 14, the sleeve 1 is accommodated power. At its rear end the power is sleeve 1 by means of a snap connection with a grid sleeve. 8 The raster sleeve 8 in turn accommodates a spring sleeve 10 slidably in their interior. The spring sleeve 10 is coupled to the rear of the display 12 by a snap connection. On the front side of the spring sleeve 10 of the transmission member 5 is slidably mounted in the power sleeve. 1 The transmission part 5 has the function of actuating the piston rod 52 of the syringe 50 to pour the contents of the syringe, as will be described in detail later. Within the spring sleeve 10, a spring is received in a tensioned state 9, the front is supported on the spring sleeve 10 and rear sleeve presses against the grid. 8 A second spring 11 is, likewise in a tensioned state on the outer side of the spring sleeve 10 and supports the front of the transmission part 5 and presses back against the spring sleeve 10. An as a piston guide 4 designated part is located with its front, sleeve-shaped, slotted extending end 4 'on the collar of the syringe 50, and through the transmission part 5, the spring sleeve 10 and the grid sleeve 8 passes into the region of the actuating head 13. the piston guide 4 is biased by a spring 7 to the front, the back of the raster sleeve 8 is supported. At its rear end the piston guide 4 is held by two integrally formed on the grid sleeve 8 locking cams 31 which engage 4 integrally formed groove 32 in a rear end of the piston guide, in the embodiment shown in Figure 1 position. Latching members, for example balls 6 (only visible in Figure 2), which are accommodated in radial apertures 33 of the piston guide 4 and engage in recesses 34 in the transmission part 5, provide in this operating position, that the transfer part 5 and the piston guide 4 only move together can. Instead of balls, other body 6 can be used as snap fittings, such as bolts.
Receiving the syringe 50 as mentioned in the housing 16 housed, which is connectable to the power sleeve 1 as described. A sliding sleeve 21 receives the syringe 50 with the interposition of a needle holder 22 (Figure 2) into itself. The needle holder 22 prevents Luerslip couplings, that the injections can be withdrawn introducer needle 37 from the syringe as long as the latter is in the autoinjector. The needle holder 22 is at the front on to a connected to the sliding sleeve 21 support ring 24th In syringes and needles having luer lock couplings, ie in which the injection needle is connected by means of a thread to the syringe, no needle holder 22 is present. The sliding sleeve 21 is slidably disposed within the housing 16 and is urged by a spring 20 into the position shown in Figure 1 operating position. For this purpose the spring supports 20, which is located in the operating position according to FIG 1 in its only slightly biased state, the front of a circumferential inner shoulder 39 of the housing 16 and the rear of a projecting outboard of the sliding sleeve 21 from. A sleeve-like needle guard 17 is slidable within the housing sixteenth The needle guard 17 is forward closed by a snap-on lid 23, which leaves a passage for the injection needle 37 free and has at its rear end an inwardly directed flange 35. A spring 18 is supported at the front on the snap cover 23 and the rear of a driving ring 19 from, which in turn is supported in the operating position according to FIG 1 the flange 35th Consequently, the spring 18 has in the operating position according to Figure 1, in which it is only slightly biased, no effect, because their remaining biasing force is absorbed by the needle shield 17th Before the injection can be triggered, the auto-injector has to be unlocked. To this end, the actuation head 13 is moved to the rear. In this case, an area of ​​the display window 51 becomes free at the front edge of the operating head 13, on the inside of a bright colored warning sleeve 53 will be visible indicating clearly that the auto-injector is now cocked and ready for injection. move with the Entsi- cherungsbewegung tongues 36, which are integrally formed on the inside of the cover disc 15 of the operating head 13, 31 via the integrally formed on the grid sleeve locking cams The tongues 36 and the locking cam 31 itself are formed such that the tongues 36 radially resiliently yield while sliding over the ends of the locking cams 31 which th the piston guide 4 festhal- by engaging in the said grooves 32nd After the movement, the Entsicherungs- integrally formed on the actuating head 13 tongues 36 are such as wedges between the locking cams 31st
The auto-injector is now ready for injection, and will set overall with the snap cover 23 at the desired location on the patient's skin. Since the needle guard 17 in the housing 16 has an axial play, he pushes itself when placed on the skin rearwardly until the flange 35 is present on the heel. 39 The patient holds the auto-injector on the grip sleeve 14 and moves the operating head 13 to the front, ie in the direction of its body back. In this release movement the tongues 36 penetrate between the Rastno- CKEN 31 and spread them radially apart, whereby the piston guide 4 is released and is pushed by the force of the spring 7 to the front. The piercing movement is also supported by the force of the springs 9 and 11, which act on the transmission part. 5 Since the transmission part 5 is connected by the balls 6 with the piston guide 4, there arises a spring system, consisting of the springs 7, 9 and 11 with a relatively high initial force, which contributes to the fact that the injection needle is safely advanced to the full depth of penetration , The force of the springs is transmitted through the sleeve-shaped front end 4 'of the piston guide 4 onto the collar of the syringe 50, and pushes it along with the sliding sleeve 21, in which it is received, to the front, so that the injection needle is advanced 37 and the skin of the patients penetrates. The front end of the sliding sleeve 21 moves in the needle shield 17 into it, wherein the driver ring 19 to take 38 to their intended spring tongues and so tension the spring 18th In this single puncturing movement, the sliding sleeve 21 presses the spring 20 together. The insertion stroke is limited by engagement of shoulder 40 of the piston guide 4 at an inner shoulder 41 of the power sleeve. 1 In this end position, the openings 33 are aligned in the piston guide 4, which accommodate the balls 6, with depressions 42 which are provided in the power sleeve 1, the balls 6 can deflect outwards and the coupling between the piston guide 4 and the transmission part 5 is canceled. Simultaneously, the piston guide 4 is locked against the power sleeve 1 is now such that the force of the spring is received by the power sleeve 20 and not counter to the force of the spring. 7 The injection now starts automatically by the piston rod of the syringe further pushed 52 50 by the transfer member 5 under the force of the springs 11 and 9 forward and thereby the medicament contained in the syringe 50 is paid out. The figure 2 shows the operating position of the automatic injector has just been described, in which the drug has been completely distributed, as can be seen in the figure from the position of the piston rod of the syringe 50th The user can clearly recognize these operating position due to the display 12 position in the display window 51st By the reference numeral 57, the body tissue of the patient is referred to, in which the injection needle 37 still inserted.
Starting from the operating position shown in Figure 2, the user can now pull back the auto-injector, wherein this goes into the position shown in Figure 3 operating position. The spring 18, which had been pre-tensioned as described during the lancing process, ensures that the needle guard 17 remains during the retreat of the automatic injector in contact with the skin of the patient. Thus, 37 of the needle protector 17 pushes itself during withdrawal of the injection needle relative to the housing 16 and sliding sleeve 21 forward until it completely covers the injection needle 37th The spring tongues 38 snap behind the flange 35 of the needle guard 17 to the outside and prevent the latter can be pushed back into the housing 16, as clearly seen in Fig. 3 This is any other un- wanted breach eliminated by the injection needle. Small hooks 58 (Figure 2), which are integrally formed on the front sliding sleeve 21 and on which the flange 35 of the needle guard is present, preventing the needle shield 17 may forward fall out of the housing sixteenth If one tries the needle guard 17 examples of play to slide back by pressing the snap-on cap 23 in the housing 16, it is prevented that the pressure on the spring tongues 38 to the sliding sleeve 21, from the latter to the syringe 50 and from this to the piston guide is passed. 4 The latter is, as mentioned locked by the balls 6 with the power sleeve 1 so that the needle guard 17 can not be pushed back into the housing 16 with considerable force. Thus, those handling with the used autoinjector reliably prevented from getting hurt accidentally with the needle 37 after injection again.
To prepare the autoinjector for further use, advertising the housing 16 and the power sleeve 1 separated from each other by releasing the bayonet-type connection. Characterized so that now the ge during insertion coat both the path via the transmission part 5 by the springs 9 and 11 on the piston rod 52 of the syringe 50 and the force on the piston guide 4 exerted by the spring 7 on the collar of the syringe 50, - bias spring 20, the sliding sleeve 21 slides relative to the housing 16 in its rear end position back. The sliding sleeve 21 takes also the needle guard 17 over their hooks 58th Figure 4 shows the reservoir portion in this operating position, in which now can be taken out, the spent syringe 50 and replaced with a new one.
1. A device for injecting an active ingredient, with an injection needle (37), a housing (16), a container (50) for the active substance, and a syringe plunger (52) of the order Ausschüttens of the active substance in the container (50) is movable and with a displaceable relative to the housing needle guard (17), characterized in that during the skin penetration of the injection needle (37) remains of the needle guard (17) in a relative to the housing (16) substantially constant position, while a spring element (18) is tensioned which after removal of the injection needle (37) from the skin of the needle guard (17) surrounding the needle advances into a position.
2. Device according to claim 1, characterized in that the container (50) in a sliding sleeve (21) is received which is in the housing (16) during the skin penetration of a retracted position shifted in an advanced position that the needle guard (17 ) in its advanced position by locking means 38) is automatically locked (35, which locking means (35, 38) are arranged and designed such that they (between the needle guard 17) and the sliding sleeve (21) become effective when the needle guard ( 17) and the sliding sleeve (21) are in their advanced position and in that means (39 (to release the locking means 35, 38) are present) that are effective when the sliding sleeve (21) is located at least approximately in its retracted position ,
3. auto-injector according to claim 2, characterized in that the locking means arranged at least one on the sliding sleeve (21) having substantially axially aligned spring tongue (38) in its relaxed state with a portion (35) of the needle guard (17) comprises axial stop forms and that the means for releasing the lock in said housing (16) is arranged, having inwardly projecting projection (39) of the Federzun- ge (38) into the retracted position of the sliding sleeve (21) radially inwardly, such that the part of the sliding sleeve (21) containing the spring tongue (38) into the region (35) of the needle shield can slide into it.
4. auto-injector according to claim 2 or 3, characterized in that a spring element (18) is present which urges the needle guard (17) in its advanced position and which by the sliding sleeve (21) is stretched when these advanced into position emotional.
5. autoinjector according to one of claims 2 to 4, characterized in that entrainment means (58) are provided which cause the needle guard (17) of the sliding sleeve is entrained (21) when the latter from its advanced position to the retracted position to be led.
6. autoinjector according to one of claims 2 to 5, marked thereby characterized that a return spring (20) is provided which acts on the sliding sleeve (21) toward its retracted position.
PCT/CH2003/000757 2002-11-25 2003-11-17 Injection apparatus comprising a needle-protecting device WO2004047892A1 (en)
JP2004554139A JP4339260B2 (en) 2002-11-25 2003-11-17 Injection device having a needle protection device
EP20030770836 EP1572270A1 (en) 2002-11-25 2003-11-17 Injection apparatus comprising a needle-protecting device
AU2003280270A AU2003280270B2 (en) 2002-11-25 2003-11-17 Injection apparatus comprising a needle-protecting device
US11/135,602 US7361160B2 (en) 2002-11-25 2005-05-23 Injection apparatus comprising a needle-protecting device
US11/948,014 US20080071225A1 (en) 2002-11-25 2007-11-30 Injection apparatus comprising a needle-protecting device
US11/135,602 Continuation US7361160B2 (en) 2002-11-25 2005-05-23 Injection apparatus comprising a needle-protecting device
WO2004047892A1 true WO2004047892A1 (en) 2004-06-10
EP2471564A1 (en) * 2008-12-31 2012-07-04 Owen Mumford Limited Autoinjectors
WO2010076569A3 (en) * 2008-12-31 2010-08-26 Owen Mumford Limited Autoinjectors
JP2006507060A (en) 2006-03-02
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