JP4842948B2 - Injection device including a syringe - Google Patents

Description

The present invention includes a tubular syringe body having a fixed collar projecting radially outward at a base end, and is mounted so as to slide in the syringe body by being introduced from the base end of the syringe body into the syringe body. An injecting syringe including an injection plunger , and a protector support forming a conduit for receiving the syringe body, the protector support having means for axially securing the syringe body to the protector support The present invention relates to a needle protection device including a body and a needle protector that is movably attached to the protector support between a retracted position and an advanced position.

  The invention particularly relates to the field of prefilled disposable infusion syringes for intramuscular or subcutaneous injection.

  The above-described device is designed to allow for accidental post-injection once the syringe contents are injected, the syringe needle is withdrawn from the patient and the needle protector is automatically transported from the needle injection end to the extended position. It is intended to minimize the risk of piercing the user.

  This type of protective device is described in particular in the FR 2 837 107 patent.

  In this device, the needle protection device is attached to the syringe body. For this purpose, the needle protection device includes a protector support that defines a cylindrical path with which the syringe engages. The protector support includes elastic interlocking means at the proximal end for securing the syringe body from a peripheral flange provided at the distal end.

  To perform an intramuscular injection, a practitioner who pierces a needle often performs a “venous test” to check that it is the intended muscle, not the vein. To perform this test, the practitioner pulls the syringe plunger backwards. If the pull is excessive, the plunger will be completely detached from the syringe body and the liquid in the syringe will come into contact with air, making the injection device completely unusable.

  The device described in the FR2837107 patent does not solve the problem of the plunger disengaging from the syringe body in the case of excessive withdrawal of the plunger.

  This danger exists when picking up lyophilic substances. That is, it occurs at the time of suction from the needle of the immediate preparation prepared immediately before injection to the syringe body.

FR2837107 FR2837107

  An object of the present invention is to propose an injection device that is equipped with a needle protection device and that reduces the risk of pulling out the plunger from the syringe body by pulling on the plunger.

Accordingly, the present invention relates to an injection device of the type described above, wherein the injection plunger includes a distal end that engages the syringe body and extends to the proximal end via the common portion of the injection plunger, and the common portion with the distal end of the injection plunger. The injection plunger includes a stop clip for stopping the injection plunger, the stop clip carried by a protector support and of the syringe body. A path of movement of the injection plunger is formed in the extension, and the minimum portion thereof is larger than the common portion of the injection plunger and smaller than the shoulder portion of the injection plunger.

  According to another feature of the device, the stop clip forms a radially open notch, alone or in a technically feasible combination, and the base of the stop clip is the movement of the injection plunger. Forming a road.

  The protector support includes elastic interlocking means that elastically interlock with the stop clip for axial fixation.

  The elastic interlocking means includes a plurality of click locking protrusions carried by the protector support, and a distance between the plurality of click locking protrusions is larger than a portion of the syringe body, and the syringe body and the protector support Allows free engagement with the body.

  In order to provide elasticity, an orifice is formed along the click locking protrusion.

  The protector support includes a stop for axially supporting the syringe body toward the proximal end, and the collar of the syringe body is axially limited between the stop of the protector support and the stop clip. As such, the stop clip is axially coupled to the protector support toward the proximal end and forms a stop that stops the collar toward the proximal end.

  The stop clip has a circular outer shape.

  The invention will be better understood by reading the following description with reference to the accompanying drawings provided by way of example.

  FIG. 1 is a perspective view of an injection device formed by a syringe 1 and a protection unit 2. In the present specification, the terms “base” and “after” are used as synonyms.

  The syringe is a standard shaped glass syringe and is intended for single use. The syringe contains fluid that is injected intramuscularly or subcutaneously. Accordingly, it has a main body 4 and a needle 6 as particularly illustrated in FIG. The needle is connected to the tip of the main body 4 by a ferrule 7.

The syringe further includes a plunger 8 that engages the body 4. The plunger, conventionally comprises a rod 10 provided with a support head 14 for impact detection section 12 provided at the distal end as shown in FIG. 6, and practitioner put thumb.

Rod 10 is in the common section has a smaller cross-section than the impact detection section 12, the way the peripheral shoulder 15 as shown in FIG. 6 on collision detecting portion 12 is formed around the rod 10 Yes.

  The syringe body 4 has a collar 16 at the proximal end, which forms a support surface for the practitioner's index and middle fingers when handling the syringe and injecting liquid, especially when the unit 2 is not present. For this purpose, two protrusions 18 facing each other in the normal diametrical direction are formed in the periphery.

  Initially, the needle 6 is protected by a movable cap 19 secured to the syringe body by engaging on the ferrule 7.

As shown in FIG. 1, the protection unit 2 has a common axis XX,
A generally tubular support 20,
A protective sleeve 22 arranged coaxially with the support 20 and having a larger diameter than the support 20;
A spring 24, and a stop clip 25 for stopping the plunger and attaching the syringe to the protection unit.

  These elements are described in detail below with reference to FIGS.

  The support 20 has a substantially cylindrical main portion 26 having an inner diameter substantially equal to the outer diameter of the syringe body 4. The main portion 26 has two longitudinal concave portions 26A facing each other in the diameter direction. The main portion 26 is enlarged by a second portion 28 having an inner diameter and an outer diameter larger than the main portion 26 at the base end to form a radial shoulder 29. The second portion 28 has an inner diameter that is greater than the maximum diameter of the syringe collar 16.

  The second or proximal end 28 is for securing the stop clip 25 so that the stop clip 25 surrounds the syringe collar 16 between the shoulder 29 and the stop clip 25, as shown in FIG. Means 30 are provided.

  As shown in FIG. 4, the stop clip 25 is planar and is formed in a hollow disk so as to form a U-shape. The stop clip 25 is delimited by a circular outer shape 25 </ b> A, and its diameter is only slightly smaller than the inner diameter of the second portion 28. The stop clip 25 has a notch 25B that engages a disk forming the clip from the center to the front. The notch 25B is opened in the radial direction around the disk forming the stop clip. The stop clip 25 has a semicircular base 25C and two parallel lips 25D extending to the base 25C. The lip 25D extends to the periphery 25A of the disk by the branch surface 25E so that the notch 25B spreads around the open end.

  The diameter of the base 25B and the distance separating the lips 25D are both indicated by D and are selected to be larger than the diameter of the common portion 10 which is the rod of the plunger and smaller than the diameter of the protrusion 12 which expands the rod 10. Is done. The diameter D is therefore smaller than the inside of the syringe body 4.

  The fixing means 30 has a deformable hook 32 facing the diameter direction, and the hook 32 is supported by the second portion 28 of the protector support 20. The hook 32 can be seen in particular from FIGS. The distance separating the hooks facing each other in the diameter direction is smaller than the outer diameter of the clip 25. A plurality of orifices 34 are formed in the second portion 28 along the hook 32 in order to impart elasticity to the hook 32.

  Each of the hooks forms a substantially frustoconical bevel 32A extending toward the free end of the second portion 28. The inclined surface 32A is intended to elastically bias the hook outward by the action of the stop clip 25 when the support 20 is fixed to the syringe 1. The hook 32 is set away from the shoulder 29 by a distance substantially equal to the added thickness of the protrusion 18 and the stop clip 25. In this way, the hook 32 forms a clip engaging means for the stop clip 25 to secure the syringe collar 16.

  Two cross-shaped through grooves 36 are formed, and one of the main portions 26 faces the other. Each groove has a first straight portion 38 extending substantially along the axis XX of the support 20 over a length larger than the needle 6, and a second straight portion 40 inclined with respect to the same axis XX. Consists of. The inclined second straight portion 40 opens at the base end of the first straight portion 38 to form a V-shape, and the V-shaped tip indicates a direction away from the base end side of the unit 2.

  The main portion 26 has a pair of elastic tongue portions 42 facing each other in the diametrical direction at the tip, and each of the tongue portions is located within the extension of the groove 36 (FIG. 5). The tongue 42 has a substantially cylindrical inner surface 42A and a substantially frustoconical outer surface 42B that branches rearward.

  The main part 26 has a pair of diametrical outer slopes 44 positioned between the elastic tongues along the periphery of the tip of the main part. The outer slope has a substantially frustoconical inclined outer surface 44A that diverges toward the front and a substantially flat tip surface 44B. The outer surface 44A is thus turned toward the recess 26A.

  The longitudinal recess 26A is formed at the base end of the slope 44 in the main portion 26 (FIG. 3).

  Furthermore, on either side of the tongue 42, a shaft hole 26B is provided from the tip of the support 20, so that the tongue 42 is radially, in particular inward, before insertion of the syringe body 4 within the support 20. It can be deformed.

  At the tip or front end, the main portion 26 has two more tongues between the elastic tongues 42 to axially couple the protector 22 and the protector support 20 in the presence of a protective cap 19 placed on the syringe body. Part 45.

  More specifically, as shown in FIG. 3, each of the tongue portions has a leg 45 </ b> A that integrally expands the main portion 26. Each leg 45A carries on the outside a protrusion 45B formed in the protector and capable of engaging with a corresponding orifice.

  The protrusion 45B is provided at a half of the length of the leg 45A extending from the region where the leg 45A is connected to the main portion 26. The leg 45A thus protrudes from the protrusion 45B.

  As shown in FIG. 3, the tongue portion is inclined toward the axis XX of the support 20 in a stationary state. That is, the tongues are concentrated in the direction of the free end with respect to each other and extend within the extension of the inner passage formed by the protector support 20.

  The tongue 45 is elastically deformable outward so that the protrusion is completely accommodated within the overall bulk extension of the main portion 26 in the rest position, while the protrusion 45B is in the deformed position. Projects radially outward beyond the overall bulk extension.

  The distance separating the free ends of the two tongues 45 is smaller than the minimum outer diameter of the ring in order to secure the protective syringe cap 19 in the rest position.

  The length of the protective sleeve 22 is substantially equal to the length of the syringe body 4. The protective sleeve 22 includes two cylindrical portions 46 and 48, and the diameter of the base end portion 46 is slightly larger than the diameter of the main portion 48. The two parts combine to form a radial shoulder 49.

  The protective sleeve 22 integrally has an outer flange 50 in the form of two projecting portions 52 diametrically opposed at the proximal end (FIGS. 4 and 5).

  Two diametrically opposed studs 54 are integrated with the sleeve at the base but within the protective sleeve 22 (FIG. 5). The two studs are respectively received and guided in two grooves 36 within the support. The support and the sleeve are thus translated relative to each other along a common axis and are movable with limited rotation about the same axis when the stud is in the ramp 40. The ramp 40 thus forms a pocket for fixing the stud 54, which pocket has a fixing depth indicated by p in FIG. This depth is measured along the axis of the protector.

  The support 20 and sleeve 22 are such that the sleeve retracts such that most of the sleeve covers most of the support 20 and the stud 54 is positioned at the tip of each of the inclined grooves 40 as shown in FIGS. It is movable between a position and an advance position of the sleeve such that the sleeve projects axially from the support 20 and the stud is positioned at the tip of the straight groove 38 as shown in FIGS.

  When the syringe 1 is fixed to the unit 2, the end position is determined by the injection configuration in which the needle 6 of the syringe 1 is intended to be released and inserted into the patient, and the protective configuration in which this needle is surrounded by a protective sleeve 22. And correspond respectively.

  The proximal end of the sleeve 22 further includes a deformable longitudinal hook 56 on the inside that faces a pair of diametrical directions. The hook 56 is formed in the sleeve 22 by a side hole. Its tip is connected to a sleeve. At the free proximal end, each hook has an inner projection.

  As shown in FIG. 3, in the absence of a syringe, the outer surface of the hook 56 extends into the extension of the sleeve. On the other hand, the inner protrusion of the hook protrudes to the inside of the cylindrical path defined by the sleeve 22. Each projection has a substantially frustoconical front surface 56A extending forward of the axis of the sleeve 22. These front surfaces 56A are thus rotated toward the front end of the protector.

  Each front surface 56 </ b> A is configured to cooperate with an inclined surface 44 </ b> A formed by the inclined surface 44 of the support 20.

  At the free end, each hook 56 has a sloping lateral front 56C that forms a stop.

  In the retracted position of the sleeve, the hook 56 extends inside the recess 26 formed in the support 20. In the advanced position of the sleeve, as shown in FIG. 13, the end face 56C of the hook 56 abuts the tongue 42 in the axial direction, and the hook and tongue thus form a rigid locking unit in the advanced position. .

  The sleeve 22 further comprises a crown of deformable tongues 58 at the tip, the tip edge forming a substantially circular opening 60, the diameter of which is smaller than the inner diameter of the main portion 26 of the support 20.

  Finally, at the tip, the main portion 48 of the protective sleeve causes the second pair of tongues when the tongue is deformed by the action of the ring of the needle protection cap 19 that engages on a syringe contained within the device. Two oval through holes 62 that can receive the protrusions 45 </ b> B carried by 45.

  In the absence of a cap, i.e. when the tongue 45 is in the rest position, the projection 45B is entirely outside the hole 62 and allows free movement of the protector relative to the support 20.

  A spring 24 is installed between the protective sleeve 22 and the protector support 20 and is a spiral spring. More specifically, this spring is housed between a shoulder 29 of the support 20 and a shoulder 49 of the sleeve 22.

  In the retracted position of the sleeve, the spring 24 is in a compressed state and provides a decompression energy related to the difference between the stiffness of the spring, the length of the spring in the rest position and the length of the compressed position indicated by L in FIGS. Have. In other words, the spring 24 has an additional compressive force threshold that corresponds to the minimum force required to further compress the spring from its initial compressed state as shown in FIGS. The stiffness and / or initial flocked filament length L of the spring is greater than the thrust required for the compressive force threshold to move the syringe plunger 8 over the entire injection stroke. More specifically, the spring force in the locked state is the injection force, that is, the force for discharging the liquid from the needle 6 of the syringe 1 and the stress for separating and sliding the pusher 12 in the syringe body 4. Greater than total.

  Cap 19 is generally tubular in shape and is shown in FIGS.

  The cap 19 is configured to surround the needle 6 before the syringe 1 is used. The cap is closed at one end and formed at the other end by an annular ring 68, the outer diameter of which is suitable for coupling to the surface 42A of the tongue 42 and the diameter of the opening 60 formed by the tongue 58 of the protective sleeve 22. It is comprised so that it may become larger. The inner surface of this ring 68 is intended to adhere to the glass ferrule 7 of the syringe body to which the needle 6 is secured in particular to ensure bacterial opacity.

  Further, the outer diameter of the cap ring 68 is greater than the distance separating the free ends of the tongue 45 in the resting state.

  The injection device of the present invention operates as follows.

  The protective device 2 is assembled in its retracted form, i.e. the form of FIGS. For this purpose, the protective sleeve 22 slides around the support 20 from the end of the support with a spring 24 between it and the support. More specifically, the sleeve 22 is moved rearward in the axial direction with respect to the support body, and at the same time, using an appropriate tool, the hook 56 is moved radially outward until it reaches at least the front portion of the longitudinal recess 26A in the axial direction. Deform to the direction.

  Next, while the sleeve is still moved rearward, the stud 54 contacts the outer surface 42B of the tongue 42, and the tongue is deformed until the peg is received by the straight portion 38. Then, the protector 22 is moved backward until the stud 54 is received by the inclined groove portion 40 by rotating the support and the protector relative to each other. In this way, the protector is moved to the retracted position.

  The glass syringe 1 is prefilled with a liquid to be injected into the patient. The syringe includes a cap 19 surrounding the ferrule 9 of the syringe body 4.

  A syringe with a cap 19 is inserted inside the unit 2 to form an injection device as shown in FIGS. More particularly, the syringe body 4 moves substantially axially within the support 20.

  The syringe body is moved through the protector until the syringe collar 16 abuts the shoulder 29.

In this position, the clip 25 is attached to the collar 16. To this end, when the plunger rod 10 has already been attached to the impact detection section 12, the clip 25 engages the periphery of the plunger rod, the plunger rod enters switching the lack. The clip 25 moves along the length of the rod 10, engages with the main portion 28, deforms the hook 32 radially outward, and connects the clips elastically.

  Next, the protruding portion 18 of the syringe collar 16 is axially fixed by the clip 25, and the clip itself is fixed by the hook 32.

  When the syringe collar 16 is fully clipped inside the proximal end 28, it cannot play the normal role of forming a support surface for the practitioner's index and middle fingers. This support function is performed by a flange 50 integrated with the sleeve 22. If the length of the protective sleeve 22 is substantially equal to the length of the syringe body 4 or if a flange 50 is provided at the proximal end of the sleeve, the practitioner will place his thumb on the support head of the plunger 8. The syringe can be operated by placing it on 14 and placing his forefinger and middle finger on the surface of the lug 52 facing the direction of the needle 6.

  Further, as shown in FIGS. 6 and 7, when the syringe 1 is fixed to the protector support 20, the cap 19 protrudes outside the protective sleeve 22.

  Further, the enlarged outer diameter of the cap ring 68 engages between the free ends of the tongue 45, causing them to deform radially outward. Due to this deformation action, the protrusion 45B is received in the through hole 62. In this position, the protector and the support are coupled in the axial direction by the cooperation of the projection 45B carried on the protector support and the through-hole 62 formed in the protector to prevent the spring 54 from loosening. It is impossible to leave the intersection at the intersection.

  When the practitioner is ready to inject the liquid contained in the syringe, he pulls the cap 19 axially forward to remove it.

  To remove the cap, the practitioner can secure the protector from the support surface with one hand, hold the syringe, and pull the cap 19 with the other hand. Even though there is a very high resistance to removing the cap, the positive axial coupling by the protrusion 45B engaging the through hole 62 will cause the spring 24 to be compressed and the stud 54 to disengage from the fixed intersection. To prevent.

  Therefore, there is no risk that the needle protector is released when the cap is removed.

  On the other hand, as shown in FIG. 7, the tongue portion 45 is brought into a stationary position by its elastic action, and the protrusion 45 </ b> A is released from the through hole 62, so that the protector 22 can move with respect to the support body 20. Become.

  After the ring 68 is removed from the ferrule 9, the ring 68 passes through the opening 60 by deforming the tongue 58. When the cap 19 is pulled out, the tongue 58 returns to the initial position.

  The practitioner then performs what is known as a “blood vessel” test. This is to check that the syringe has been correctly stabbed into the muscle, not the artery or vein of the patient. For this purpose, the plunger 8 is pulled in the direction of the proximal end. If blood is aspirated into the syringe body, the practitioner will determine that the needle has pierced the vein or artery and will begin repositioning the needle.

If the excessive traction is applied to the plunger rod by the practitioner, as shown in Figure 9, by collision detection section 12 abuts against the clip 25 via a shoulder 15, is stopped. Notch 25B forms a passage having a portion smaller than the portion of the impact detection section 12, collision detection section can be prevented from passing beyond the clip. On the other hand, the plunger rod 10 having a smaller diameter can freely slide in the notch 25B.

Accordingly, the clip 25 forms a stop for stopping the collision detecting section when fixes the syringe body 4 in the protector, excessive traction is applied to the impact detection section 12. If the clip does not exist, collision detecting portion is withdrawn from the syringe body, it will disable the injection device.

  Stopping the plunger when excessive traction is applied is also useful, for example, when filling a syringe with a lyophilic material or the like through a needle.

  To begin the injection process itself, the practitioner applies pressure to the support head 14 of the plunger with his index and middle fingers in contact with the needle-facing surface of the bulge 52. Extrude the liquid. During injection, there is no movement between the protector support 20 and the protective sleeve 22, and the spring 24 is compressed to the length L as shown in FIG.

  The injection process is continued until the pusher 12 of the plunger 8 reaches the end of the injection stroke.

  The practitioner then pulls the needle out of the patient. In order to release the protection unit 2, the practitioner further pressurizes the plunger rod 8. This pressure is greater than the predetermined force produced by the locked spring 24, and the spring is further compressed from its length L to its short length L 'as shown in FIGS. To do this, assuming a fixed syringe, the protective sleeve 22 moves axially toward the proximal end of the support 20. The practitioner performs this movement by using his index and middle fingers to apply a pressure corresponding to the bulging portion 52 of the flange 50 of the sleeve 22. This pressure, in combination with the translational movement, rotates the protective sleeve 2 about the syringe support 20 and guides the stud 54 by the inclined groove 40. As shown in FIG. 11, the rotational movement of the protective sleeve 2 continues until the stud reaches the proximal end of the inclined groove portion 40, that is, the proximal end of the longitudinal groove portion 38. Then, the device 2 is attached to a position where the spring 24 is unlocked.

  The practitioner then releases the pressure previously applied to the flange 50 and relaxes the spring 24 to rest. The stud 54 translates in the longitudinal groove 38 to the end as shown in FIGS. The practitioner can control the parallel movement of the protective sleeve 22 relative to the support 20 by gradually releasing his grip on the flange 50. When the stud 54 reaches the end of the groove 36 (FIG. 15), the protector 36 is in the advanced position.

  Further, as the protective sleeve 22 translates relative to the support 20, the hook 56 is supported in the longitudinal recess 26A until it slides along the end 44 of the support by the cooperation of the corresponding surfaces 56A and 44A. Is done.

  In the advanced position of the needle protector, the hook 56 is retained by the co-operation of the surfaces 56C and 44B to prevent the protector sleeve 22 from being brought to its initial position. Similarly, the sleeve 22 cannot be easily pulled away from the support 20. This is because the stud 54 abuts against the tip base of the longitudinal groove 38 (FIG. 15), and the tongue 42 forming this base is held radially between the body of the syringe 1 and the protective sleeve 22. Because.

  The injection device of the present invention is easily used while the practitioner controls the movement of the protective sleeve covering the needle. The number of parts of the protection unit 2 shown in the figure is reduced to three.

  The device of the present invention is adaptable in terms of both shape and size for various types of syringes. This device therefore has the advantage of not repelling the commonly used syringes that are used, and therefore it is not necessary to make any modifications to the filling process of those syringes.

The following can be considered as another example of the device of the present invention.
Unlike the above-described embodiment, the stud 54 and / or the flange 50 of the protective sleeve 22 may be added to the sleeve 22 without being formed as one integrated part.
Contrary to the above-described device, the stud 54 may be provided on the outer surface of the protector support 20 and the guide groove 36 may be formed in the protective sleeve 22.
The support 20 may be formed in one piece with the syringe body 4.

It is a disassembled perspective view of the injection device by this invention before an assembly. 2 is an elevational view of a retracted position of a protective device associated with the injection device of FIG. It is sectional drawing along the III-III surface of FIG. It is a top view in the direction of the IV arrow of FIG. It is sectional drawing along the VV plane of FIG. Fig. 6 is a cross-sectional view similar to Fig. 5 of an injection device according to the present invention before use. It is a top view in the direction of arrow VII of FIG. It is a figure similar to FIG. 6 of the injection apparatus prepared for use. FIG. 9 is a view similar to FIG. 8 of the plunger of the injection device pulled out to the end position. FIG. 4 is a view of the same section 1 of FIG. 3 of the injection device at the use end. FIG. 11 is a view similar to FIG. 10 where the syringe of the injection device is not shown. It is sectional drawing along the XII-XII surface shown by FIG. FIG. 11 shows the injection device in the advanced position, similar to FIG. FIG. 14 is a cross-sectional view taken along the XIV-XIV plane shown in FIG. 13, showing the injection device in the advanced position. Fig. 14 is a view similar to Fig. 13 showing the injection device in the advanced position, with no syringe shown.

Claims (8)

A tubular syringe body (4) having a fixed collar (16) projecting radially outward at its proximal end, and a syringe body (4) by entering the syringe body (4) from the proximal end of the tubular syringe body (4) An injecting syringe (1) including an injection plunger (8) mounted for sliding therein, and a protector support (20) forming a conduit for receiving the syringe body (4), the syringe body A protector support (20) having means (30) for axially fixing (4) to the protector support (20), and against the protector support (20) between a retracted position and an advanced position; In an injection device comprising a needle protection device (2) comprising a movably attached needle protector (22),
Said injection plunger (8) comprises a tip (14) the common portion via a (10) was extended to the proximal end of the engagement to the tubular syringe body (4) combined and injected plunger (8), the injection plunger (8 ) a tip (14) and shoulder is bent in the direction of the proximal end Ru defined between the common part (10) of the injection plunger (8) (15) of, and the injection plunger (8), A stop clip (25) for stopping the injection plunger (8);
Said stop clip (25) is carried by a protector support (20) and forms a movement path (25B) for the injection plunger (8) within the extension of the syringe body (4), the smallest part of which is the injection plunger (8). An injection device characterized in that it is larger than the common part (10) and smaller than the shoulder (15) part of the injection plunger (8).   The stop clip (25) forms a radially open notch (25B) and its base (25C) forms a path of movement for the injection plunger (8). Injection device.   The distance separating the stop clip (25) forming the notch is selected to be larger than the diameter of the common part (10) of the injection plunger (8) and smaller than the inside of the syringe body (4). The injection device according to claim 2, wherein:   4. The protector support (20) according to any one of claims 1 to 3, characterized in that it includes interlocking means (32) that elastically interlock with a stop clip (25) for axial fixation. 1 injection device.   The interlocking means includes a plurality of click locking protrusions (32) carried by the protector support (20), and the distance between the plurality of click locking protrusions (32) is larger than that of the syringe body (4). 5. Injection device according to claim 4, characterized in that it is large and allows free engagement between the syringe body (4) and the protector support (20).   6. Injection device according to claim 5, characterized in that an orifice (34) is formed along the click-locking projection (32) to provide elasticity.   The protector support (20) includes a stop (29) for axially supporting the syringe body (4) toward the proximal end, and the collar (16) of the syringe body (4) is the protector support (20). The stop clip (25) is connected axially to the proximally facing protector support (20) and is connected to the proximal end so as to be axially restricted between the stop (29) and the stop clip (25) of the 7. An injection device according to any one of the preceding claims, characterized in that it forms a stop for stopping the facing collar (16).   8. The injection device according to claim 1, wherein the stop clip (25) has a circular outer shape.

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