JP4874972B2 - Needle protection device and injection device having the same - Google Patents

Description

The present invention relates to a needle protection device having the following configuration.
-A protector support forming a conduit for receiving the syringe body;
-Forming an end opening for the passage of the needle and the needle protection cap, with a radial projection forming a finger rest at the other end, moving between a retracted position and an advanced position with respect to the protector support A needle protector that is possible,
-A compression spring provided between the protector support and the needle protector;
Means for initially fixing the needle protector against the action of the compression spring and releasable by displacement of the needle protector relative to the protector support in the release direction;

  The present invention relates to the field of prefilled disposable syringes intended especially for intramuscular or subcutaneous injection.

  In the above device, when the contents of the syringe are injected, the needle of the syringe is withdrawn from the patient and the protector automatically protrudes to a position beyond the injection end of the needle so that the user is stabbed after the injection. Is intended to reduce.

  This type of protective device is described in document FR 2 837 107.

  The device described in this document is such that the positioning of the protector of the needle is effected by an axial rearward displacement of the protector relative to the support of the needle. This displacement takes place against a spring interposed between the protector support and the protector, and the needle protector is secured only by the spring force to prevent activation of the device.

  Syringes positioned on this type of protection device are initially equipped with a movable needle protection cap. A syringe equipped with this needle protection cap is introduced by the proximal end of the protector. When the syringe is positioned within the device, the needle protection cap is removed from the tip opening of the protector.

  The needle protection cap is generally made of rubber and is held on the syringe end around the needle by the elastic action of the rubber in the radial direction. Therefore, a relatively high force for fixing the needle protection cap is generated at the end of the syringe body, and it is necessary to apply a strong traction force to the protector in order to pull it out.

  To hold the device during withdrawal of the needle protection cap, the user holds the protector by a radial projection provided on the protector so as to form a finger rest.

  Thus, when a pulling force is applied to the needle protection cap, the injector and the protector support integrated with the syringe are driven, and the protector is displaced in the axial direction with respect to the protector support, so that no injection is performed. Even if the device starts up.

  It is an object of the present invention to provide a needle protection device that reduces the risk of accidental activation when the needle protection cap is pulled out.

  The present invention relates to a protection device of the aforementioned type, the protection device according to the invention comprising mechanical means for locking the needle protector in the release direction relative to the protector support, said mechanical means being at the end opening of the needle protector. It is activated by the action of the engaging needle protection cap and is deactivated by releasing the needle protection cap from the end opening of the needle protector.

According to another feature of this device, incorporating any combination that can be carried out alone or technically,
The mechanical locking means is at least one tongue that is elastically deformable integrated with the first of the needle protector and the protector support, the tongue being in the presence of a needle protection cap; Between the protector and the protector support second in the axial direction and the unlocked position away from the protector and protector support second when the needle protection cap is not present. Each tongue extends to an unlocked position when stationary, and each tongue holds it deformed by the action of a needle protection cap engaged with the end opening of the needle protector Has a working range to
The tongue has a protrusion engageable with an orifice formed in a second of the needle protector and the protector support;
The tongue extends to an extension of the front end of the protector support.

  The present invention further relates to a syringe including a tubular body having a needle fixed to a distal end and an injection piston mounted so as to slide in the tubular body, and an injection device including the above-described needle protection device.

  The invention will be better understood by reading the following description, which is provided by way of example only (with reference to the drawings).

  FIG. 1 is a perspective view of an injection device formed by a syringe 1 and a protection unit 2. The terms “group” and “after” are used below as synonyms for “previous” and “previous”.

  The syringe 1 is a standard shaped glass syringe and is intended for single use. This is a liquid that is injected into a patient intramuscularly or subcutaneously. Accordingly, as shown in FIG. 6, the body 4 and the needle 6 are provided. This needle is connected to the tip of the main body 4 by a ferrule 7.

  The syringe further comprises a plunger 8 engaged within the body 4. As shown in FIG. 6, this plunger comprises a rod 10 provided with a plug 12 at its tip and a support head 14 on which the thumb of the practitioner's hand is placed.

  The rod 10 has a portion that is smaller than the portion of the plug 12 at its common portion, thereby forming a peripheral shoulder 15 on the plug 12 around the rod 10 as seen in FIG.

  The syringe body 4 is intended to form a support surface for the practitioner's index and middle fingers when operating the syringe to inject the liquid contained therein, particularly when the unit 2 is absent. A collar 16 is formed on the base end portion of the rim so as to form two protruding portions 18 facing each other in the diametrical direction.

  The needle 6 is initially protected by a movable needle protection cap 19 that engages on the ferrule 7 and is fixed to the syringe body.

The protection unit 2 with the axis XX is, as shown in FIG. 1, a generally tubular support 20,
A protective sleeve 22 arranged coaxially with the support 20 and having a larger diameter;
- spring 2 4, and - said plunger is stopped, the clip 25 for attaching the syringe to the protection unit
Is basically included.

These elements will each be described in detail below with reference to FIGS.
The support 20 includes 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 recesses 26A that are diametrically opposed. The main portion 26 is expanded at the proximal end by a secondary portion 28 having an inner diameter larger than the diameter of the main portion 26 to form a radial shoulder 29. The secondary portion 28 has an inner diameter that is greater than the maximum diameter of the syringe collar 16.

  The secondary or proximal end 28 is a means 30 for securing the clip 25 such that the clip 25 surrounds the syringe collar 16 between the shoulder 29 and the clip, as shown in FIG. It has.

As is apparent from FIG. 4, the clip 25 is formed in a flat and hollow U-shaped disc. The periphery of the clip 25 is formed in a circular outer shape 25 </ b> A, and the diameter is slightly smaller than the inner diameter of the secondary portion 28. The clip 25 has a notch 25B that engages the disk forming the clip beyond its center. The notch 25B is opened in the radial direction at the periphery of the disk forming the clip. This has a semi-circular base 25C and two parallel lips 25D extending from the base 25C. The two lips 25D extend to the peripheral edge 25A of the disk by the branch surface 2 5 E, and the notch 25B extends in the vicinity of the opening end.

  The diameter of the base 25C and the distance separating the lips 25D are both indicated by the symbol D, but are larger than the diameter of the common part of the plunger rod and smaller than the diameter of the plug 12 that expands the rod 10. Is selected. Therefore, this diameter D is smaller than the inner part of the syringe body 4.

  The securing means 30 includes a diametrically opposed deformable hook 32 carried on the proximal end 28 of the protector support. These hooks can be seen in particular from FIGS. The distance between hooks facing each other in the diameter direction is smaller than the outer diameter of the clip 25. An orifice 34 that gives elasticity to the hook is formed at the base end portion 28 along the hook 32.

  Each hook forms a substantially frustoconical inclined surface 32 </ b> A extending toward the free end of the proximal end portion 28. These slopes 32A are intended so that when the protector support 20 is secured to the syringe 1, the hook is elastically pushed outward by the action of the clip 25. The hook 32 is set to be separated from the shoulder 29 by a distance substantially equal to the total thickness of the protruding portion 18 and the clip 25. These hooks 32 thus form a clip-on engagement means for the clip 25 that secures the syringe collar 16.

Two cross-shaped through grooves 36 facing each other are formed in the main portion 26. Each groove includes a first straight portion 38 that extends substantially along the axis X-X of the support 20 over a longer length than the needle 6 extends inclined with respect to the coaxial X-X The second straight portion 40 is configured. The inclined portion 40 opens in a V shape at the base end of the first linear portion 38, and the tip thereof is directed away from the base end side of the unit 2.

  The main portion 26 includes a pair of diametrically opposed elastic tongue portions 42 at the tip thereof, each of which is located on the extension of the through groove 36 (FIG. 5). These tongues 42 have a substantially cylindrical inner surface 42A and a substantially frustoconical outer surface 42B branched rearward.

  The main portion 26 includes a pair of diametrically opposed slopes 44 positioned between the elastic tongues along the periphery of the tip. These have a substantially frustoconically inclined outer surface 44A extending toward the front and a substantially flat tip surface 44B. Accordingly, the outer surface 44A rotates toward the recess 26A.

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

  Further, slots 26B are provided on the side surfaces of the tongues 42 in the axial direction from the tip of the protector support, and these tongues 42 are radially inward before the main body 4 of the syringe 1 is inserted into the protector support 20. It can be deformed in the direction.

The main portion 26 is connected to the tip or front end of the needle protector 22 and the protector support 20 in the axial direction between the elastic tongues 42 with the syringe body covered with the needle protection cap 19. In addition, two tongues 45 are provided.

  More specifically, as shown in FIG. 3, each tongue includes a leg 45 </ b> A that extends and integrates the main portion 26. Each leg 45A carries on its outer side a projection 45B that can be engaged with a corresponding orifice formed in the needle protector.

  The protrusion 45B extends from the region where the leg communicates with the main portion 26 over half the length of the leg 45A. Thus, the leg 45A extends beyond the protrusion 45B.

  As shown in FIG. 3, in the resting state, the tongue is inclined in the direction of the axis XX of the protector support, i.e. concentrated in the direction of its free end and formed by the protector support. It extends on the extension of the inner passage.

  The tongue portion 45 can be elastically deformed outward, and the projection is accommodated within substantially the entire length of the main portion 26 in the stationary position, while the projection 45B exceeds the entire length of the main portion 26 in the deformed position. Protrusively in the radial direction.

  The distance separating the free ends of the two tongues 45 is smaller than the minimum outer diameter of the ring for securing the needle protection cap 19 of the syringe when they are in the rest position.

  The length of the protective sleeve 22, i.e. the needle protector 22, is substantially equal to the length of the syringe body 4. The sleeve is composed of 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. These two parts are connected to form a radial shoulder 49.

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

  At the proximal end portion, two studs 54 diametrically opposed to the inside of the protective sleeve 22 are integrated with the sleeve (FIG. 5). These two studs are respectively guided in the two grooves 36 of the protector support. Thus, when the stud is in the ramp 40, the protector support and sleeve can move laterally relative to each other along a common axis and perform limited rotation about the same axis. The inclined portion 40 forms a pocket for fixing the stud 54, and the pocket has a certain depth indicated by p in FIG. This depth is measured along the axis of the protector.

  As shown in FIGS. 2 to 8, the support 20 and the sleeve 22 are the sleeves in which most of the sleeve covers most of the protector support and the stud 54 is located at the tip of each inclined groove 40. As shown in FIGS. 13 to 15, the retractable position and the forward position where the sleeve protrudes from the protector support in the axial direction and the stud is located at the tip of the linear groove 38 are movable.

  When the syringe 1 is secured to the unit 2, the positions of these ends are respectively surrounded by an injection arrangement in which the needle 6 of the syringe 1 is released and ready to be inserted into the patient, and the needle is surrounded by a protective sleeve 22. Corresponding to the protection arrangement

  The proximal end of the sleeve 22 further includes a pair of deformable longitudinal hooks 56 diametrically opposed to the inside thereof. These hooks are formed in the sleeve 22 by side slots. The tip of the hook is connected to the sleeve. At its free proximal end, each hook has an internal projection.

  In the absence of a syringe, the outer surface of the hook 56 extends into the sleeve extension, as shown in FIG. On the other hand, the internal protrusions of these hooks extend into the cylindrical passage formed by the sleeve 22. Each protrusion has a substantially frustoconical front surface 56 </ b> A that extends forward of the axis of the sleeve 22. These front surfaces 56A are turned to the front end of the protector.

  Each front surface 56A is configured to cooperate with an inclined surface 44A formed by the inclined surface 44 of the protector support.

  Each hook 56 has an inclined lateral front surface 56C that forms a stop at its free end.

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

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

  Finally, the main part 48 of the protective sleeve has a second pair of tongues 45 when its tongue is deformed by the action of the ring of the needle protection cap 19 which engages the syringe contained in the device at its tip. Two through orifices 62 having a rectangular shape capable of receiving the protrusion 45B carried by the.

  In the absence of the needle protection cap, i.e. when the tongue 45 is in the rest position, the projection 45B is completely outside the orifice 62, allowing free movement of the protector relative to the protector support.

  The spring 24 is a spiral spring disposed between the protective sleeve 22 and the protector support 20. More particularly, this spring is accommodated 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 the decompression energy associated with the stiffness of the spring and the difference between the length of the stationary spring and the length of the compressed spring indicated by L in FIGS. Have. In other words, the spring 24 has an additional compressive force threshold corresponding to the minimum force required to further compress from the initial compressed state shown in FIGS. The stiffness of the spring and / or the initial compression length L is selected such that this force threshold is greater than the thrust required to displace the plunger 8 of the syringe 1 throughout the injection stroke. More specifically, the spring force in the locked state is greater than the sum of the injection forces, i.e., the force for draining the liquid from the needle 6 of the syringe 1 and the stress for removal and sliding of the pusher 12 in the syringe body 4.

  Needle protection cap 19 is generally tubular and is shown in FIGS.

  The cap 19 surrounds the needle 6 before the syringe 1 is used. This needle protection cap is closed at one end and formed from the other end by an annular ring 68, the outer diameter of which is coupled to the surface 42 A of the tongue 42 and of the opening 60 formed by the tongue 58 of the protection sleeve 22. It is comprised so that it may become larger than a diameter. The inner surface of this ring 68 is intended to be glued to the glass ferrule 7 of the syringe body to which the needle 6 is secured to ensure the impermeability of bacteria.

  Further, the outer diameter of the ring 68 of the needle protection cap is larger than the distance separating the free ends of the tongue 45 in the stationary 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 has a spring 24 between the tip of the protector support that slides around the support 20 and the protector support. More specifically, the sleeve 22 is moved axially rearward with respect to the protector support, and at the same time using a suitable tool, the hook 56 is at least axially radial until it reaches the front of the longitudinal recess 26A. Deforms outward.

  Then, while the sleeve is still moved backward, the stud 54 comes into contact with the outer surface 42B of the tongue portion 42, and the tongue portion is deformed until the peg is received by the straight portion 38. Then, the protector 22 is moved rearward until the stud 54 is received by the inclined groove 40 by rotating the protector support and the protector relative to each other. Thus, the protector is in the retracted position.

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

  A syringe with a needle protection 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. For this purpose, if the plunger rod 10 is already attached to the plug 12, the clip 25 is engaged around the plunger rod and the plunger rod is placed in the notch. The clip 25 is moved along the length of the rod 10 and is engaged with the main portion 28. In this manner, the hook 32 is deformed radially outward to connect the clips elastically.

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

  Once the syringe collar 16 is fully clipped inside the proximal end 28, it cannot serve 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 needle protection cap 19 protrudes outside the protection sleeve 22.

  In addition, the enlarged outer diameter of the ring 68 of the needle protection cap engages between the free ends of the tongue 45 and deforms them radially outward. By this deformation action, the protrusion 45B is received by the orifice 62. In this position, the protector and the protector support are coupled in the axial direction by the cooperation of the protrusion 45B carried on the protector support and the orifice 62 formed on the protector, and the spring 54 is prevented 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 needle protection cap 19 axially forward and removes it.

  To remove the needle protection cap, the practitioner can hold the syringe with one hand holding the protector from the support surface and pull the needle protection cap 19 with the other hand. Even with a very high resistance to removing the needle protection cap, the positive axial coupling by the protrusion 45B engaging the orifice 62 compresses the spring 24 and disengages the stud 54 from the fixed intersection. To prevent that.

  Therefore, there is no risk that the needle protector is released when the needle protection 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 effect, and the protrusion 45 </ b> A is released from the orifice 62, so that the protector 22 can move with respect to the support body 20. .

  After the ring 68 is removed from the ferrule 9, the ring 68 passes through the opening 60 due to the deformation of the tongue 58. When the needle protection 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 been stabbed into a vein or artery and will begin repositioning the needle.

  When excessive pulling is applied to the plunger rod by the practitioner, as shown in FIG. 9, the plug 12 stops by coming into contact with the clip 25 through the shoulder 15. The notch 25B forms a passage having a smaller portion than the portion of the plug 12 and prevents the plug from passing over the clip. On the other hand, the plunger rod 10 having a smaller diameter can freely slide in the notch 25B.

  Thus, the clip 25 secures the syringe body 4 to the protector and forms a stop that stops the plug if excessive traction is applied to the plug 12. If there is no clip, the plug will be withdrawn from the syringe body and the injection device will be disabled.

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

  To begin the injection process itself, the practitioner enters the syringe by applying a pressing force to the plunger support head 14 with his index and middle fingers in contact with the surface of the lug 52 facing the needle. Extrude the liquid. During injection, there is no movement between the protector support 20 and the protective sleeve 22, and the spring 24 remains compressed to 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 spring 24 in the locked state, and the spring is further compressed from its length L to a short length L 'as shown in FIGS. To do this, assuming a fixed syringe, the protective sleeve 22 is displaced 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 rotates the protective sleeve 2 about the syringe support 20 in combination with the translational movement, and guides the stud 54 by the inclined groove 40. As shown in FIG. 11, the rotational movement of the sleeve 22 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 tip 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 tip of the groove 36 (FIG. 15), the protector 36 is in its advanced position.

  Further, as the protective sleeve 22 translates relative to the protector support 20, the hook 56 is longitudinally recessed 26A until it slides along the tip 44 of the protector support by the cooperation of the corresponding surfaces 56A and 44A. Supported by

  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. Thus, this device 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 these syringes.

The following can be considered as another example of the device of the present invention.
-Unlike the above-described embodiments, 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 device described above, 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 a part integrated with the syringe body 4.

It is a disassembled perspective view of the injection apparatus of this invention before an assembly. 2 is a side view of the protection device for the injection device of FIG. 1 in a retracted position; FIG. 3 is a cross-sectional view along the III-III plane shown in FIG. 2. FIG. 4 is a plan view seen from the direction of arrow IV shown in FIG. 2. It is sectional drawing along the VV plane shown by FIG. FIG. 6 is a view of the injection device of the present invention before use, taken along the same section as FIG. 5. It is the top view seen from the direction of arrow VII shown by FIG. FIG. 7 is a view similar to FIG. 6 showing the syringe ready for use. FIG. 9 is a view similar to FIG. 8 with the plunger of the injection device pulled out to the end position. FIG. 4 is a view along the same cross section as FIG. 3 of the injection device at the end of use. FIG. 11 is the same view as FIG. 10, with no syringe shown. It is sectional drawing along the XII-XII plane shown by FIG. FIG. 11 is a view similar to FIG. 10 showing the injection device in the advanced position. It is sectional drawing along the XIV-XIV plane shown by FIG. FIG. 14 is a view similar to FIG. 13 with no syringe shown.

Claims (6)

A protector support (20) forming a conduit for receiving the syringe body (4);
An end opening (60) for the passage of the needle (6) and the needle protection cap (19) at one end and a radial projection ( 50 ) forming a finger rest at the other end, said protector support A needle protector (22) movable between a retracted position and an advanced position relative to the body (20);
A compression spring (24) provided between the protector support (20) and the needle protector (22);
Means for initially fixing the needle protector (22) against the action of the compression spring (24), released by displacement of the needle protector (22) relative to the protector support (20) in the release direction; In a needle protection device (2) with possible means (38, 40, 54),
The needle protection device includes mechanical locking means (45, 62) for locking the needle protector (22) to the protector support (20) in the release direction, the mechanical locking means being a needle protector. Actuating by the action of a needle protection cap (19) engaged with the end opening (60) of (22) and releasing the needle protection cap (19) from the end opening (60) of the needle protector (22) to the outside. A needle protection device which is deactivated by Said mechanical locking means comprises at least one elastically deformable tongue (45) integrated with either the needle protector (22) or the protector support (20), the tongue (45) being When the needle protection cap (19) is present, the locking position where the needle protector (22) and the protector support (20) are in axial contact with each other and the needle protection cap (19) is absent. The needle protector (22) and the protector support (20) can be displaced between an unlocked position away from the other , the tongue (45) extends to the unlocked position when stationary, and The tongue (45) has a working area (45A) for deforming and holding in the locking position by the action of the needle protection cap (19) engaged with the end opening (60) of the needle protector (22). In claim 1 characterized by The placing of the needle protection device. The said tongue part (45) has a protrusion (45B) engageable with the orifice (62) formed in either one of a needle protector (22) and a protector support body (20). 2. The needle protection device according to 2.   4. Needle protection device according to claim 2 or 3, characterized in that the tongue (45) is integrated with a needle protector (22).   The needle protection device according to any one of claims 1 to 4, characterized in that the tongue (45) extends at its front end to an extension of the protector support (20).   6. A syringe (1) comprising a tubular body (4) having a needle (6) fixed at its tip and an injection piston (8) slidably mounted in said body (4), and any of claims 1-5 An injection device comprising the needle protection device (2) according to claim 1.

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