TW201834708A - Safety injector and safety mechanism usable therewith capable of calibrating a needle for only one time in installing the injector - Google Patents

Abstract

The present invention discloses a safety injector and a safety mechanism usable therewith. The safety injector (1) includes: a syringe (2) having a proximal end (3), a distal end (4), a chamber (5) provided between the proximal end and the distal end and defining a longitudinal axis, and a needle holding portion (6) extending from the distal end to a distal side; a plunger (7) having a distal side portion inserted into the syringe from the proximal end of the syringe, and a proximal side portion located outside the syringe; a needle (8) having a proximal side portion inserted into a needle channel of the needle holding portion from the distal side of the needle holding portion, and a distal side portion located outside the needle holding portion, wherein the needle is hollow and in communication with fluid of the chamber of the syringe; and a safety mechanism (9) at least partially surrounding the needle holding portion for installation, wherein the distal side portion of the needle is not covered by the safety mechanism in an unactuated position of the safety mechanism, and at least the terminal of the distal side of the needle is covered by the safety mechanism in an actuated position to prevent accidental contact with the terminal of the distal side of the needle. According to the present invention, when the injector is assembled, the safety mechanism is installed first and then the needle is installed so that the needle is calibrated for only one time and the needle is not interfered before the safety mechanism is actuated.

Description

   Safety syringe and safety mechanism for the same   

The invention relates to a safety syringe and a safety mechanism for the safety syringe.

Accidental stabbing of a used syringe can spread disease. Thus, the prior art teaches syringes with actuatable safety shields that can be positioned to protect against accidental contact with the needle tip after use of the syringe. The prior art safety shield is provided with a barrier for protecting the needle tip, the barrier having a needle channel, and the needle needs to be passed through the needle channel of the barrier to assemble the safety shield with the barrier during assembly of the syringe. It is unavoidable to touch the needle during the installation process and need to calibrate the needle again, which is time consuming and prone to errors.

The present invention aims to solve the aforementioned problems in the prior art.

In one aspect, the present invention provides a safety syringe including a syringe having a proximal end, a distal end, and a cavity between the proximal end and the distal end that defines a longitudinal axis, and the needle-holding portion extends distally from the distal end. A plunger having a distal portion inserted into the syringe from the proximal end of the syringe and a proximal portion located outside the syringe; a needle having a needle inserted into the needle channel of the needle holding portion from the distal side of the needle holding portion A proximal portion and a distal portion located outside the needle-holding portion, the needle is hollow and in fluid communication with the cavity of the syringe; and a safety mechanism, which is installed at least partially around the needle-holding portion, in an unactuated position of the safety mechanism, The distal portion of the needle is not covered by the safety mechanism. In the actuated position of the safety mechanism, at least the distal end of the needle is covered by the safety mechanism to prevent accidental contact with the distal end of the needle.

Preferably, the safety mechanism is axially engaged at least partially around the needle holding portion.

Preferably, the safety mechanism can rotate freely around the needle holding portion.

Preferably, the safety mechanism includes a guide lock member and a protection member, the guide lock member is installed at least partially around the needle holding portion, the protection member is provided at least partially around the needle holding portion and is located on the distal side of the guide lock member, and the protection member can be never actuated The position is moved to the actuated position. In the unactuated position, the distal portion of the needle is not covered by the protective member. At the actuated position, at least the distal end of the needle is covered by the protective member. A mechanism for releasably maintaining a protection member in an unactuated position, a mechanism for guiding the protection member to move from an unactuated position to an actuated position, and a mechanism for locking the protection member in an actuated position.

Preferably, the guide lock member includes a sleeve portion mounted around the needle holding portion and a guide lock portion extending longitudinally and proximally from the outside of the sleeve portion.

Preferably, the protection member includes a sleeve portion provided around the needle holding portion on a distal side of the sleeve portion of the guide lock member, an arm portion extending from the outside of the sleeve portion of the protection member in the longitudinal direction to the proximal side, and the arm The finger touches the part at the proximal end of the part.

Preferably, the mechanism for releasably maintaining the protection member in the non-actuated position includes a spring piece on the guide lock portion of the guide lock member and a protrusion provided on the arm portion of the protection member in the longitudinal direction on the side facing the spring piece. In the non-actuated position, at least a portion of the shrapnel on the guide lock portion is received on the distal side of the projection to maintain the protection member in the non-actuated position, and the projection is shaped to allow application of a finger to the finger contact portion of the protection member. When a finger is applied on the far side, the elastic piece on the guide lock portion rises upwards to release the protective member from the unactuated position.

Preferably, the mechanism for guiding the protection member to move from the unactuated position to the actuated position includes at least one longitudinal guide groove on the guide lock portion of the guide lock member and at least one corresponding longitudinal protrusion on the arm portion of the protection member. Edge, in the unactuated position, the distal portion of the longitudinal flange is located in the longitudinal guide groove, and the longitudinal guide groove and the longitudinal flange are shaped to allow a distal finger force to be applied to the finger contact portion of the protective member, The longitudinal flange slides distally along the longitudinal guide groove until the finger contact portion contacts the guide lock portion and stops.

Preferably, the mechanism for locking the protection member in the actuated position includes a spring piece on the guide lock portion of the guide lock member and a projection provided on the arm portion of the protection member in the longitudinal direction on the side facing the spring piece and the proximal end of the protection member. At least one guide protrusion provided at the place corresponding to at least one recess provided on the guide lock portion of the lock member, when the protection member moves from the unactuated position to the actuated position, the elastic piece can pass over the projection and be caught on the projection The block is proximal, and the guide projection is received in the depression to lock the protective member in the actuated position in a manner that forms a slope with the longitudinal axis.

Preferably, a protruding portion or a recessed portion is provided on an inner side of the sleeve portion of the guide locking member, and the protruding portion or the recessed portion engages a recessed portion or a protruding portion formed on the outer side of the needle holding portion to axially guide the sleeve portion of the locking member. Snaps onto the syringe.

Preferably, the safety syringe further comprises a needle cover for covering the needle and is shaped to fit the shape of the safety mechanism.

Preferably, the inner surface of the needle shield is provided with at least a pair of ribs, which are in sliding engagement with at least one flange on the guide lock portion of the guide lock member.

Preferably, the inner surface of the needle shield is further provided with a pair of ribs, and the pair of ribs are press-engaged with the wedge-shaped projections on the sleeve portion of the guide locking member.

Preferably, the outer surface of the needle shield is provided with a protruding anti-slip strip.

Preferably, the sleeve portion of the protection member is formed in a cap shape with a top opening, and the hole diameter of the top opening is smaller than the inner diameter of the sleeve portion body of the protection member.

Preferably, the finger contact portion is formed as a plate-like portion extending laterally outward from the proximal end of the arm portion of the protective member.

In another aspect, the present invention provides a safety mechanism for a safety syringe. The safety mechanism is installed at least partially around the needle holding portion of the safety syringe. In the unactivated position of the safety mechanism, the distal portion of the needle is not covered by the safety mechanism. In the actuated position of the safety mechanism, at least the distal end of the needle is covered by the safety mechanism to prevent accidental contact with the distal end of the needle.

Preferably, the safety mechanism is axially engaged at least partially around the needle holding portion.

Preferably, the safety mechanism can rotate freely around the needle holding portion.

Preferably, the safety mechanism includes a guide lock member and a protection member, the guide lock member is installed at least partially around the needle holding portion, the protection member is provided at least partially around the needle holding portion and is located on the distal side of the guide lock member, and the protection member can be never actuated The position is moved to the actuated position. In the unactuated position, the distal portion of the needle is not covered by the protective member. At the actuated position, at least the distal end of the needle is covered by the protective member. A mechanism for releasably maintaining a protection member in an unactuated position, a mechanism for guiding the protection member to move from an unactuated position to an actuated position, and a mechanism for locking the protection member in an actuated position.

Preferably, the guide lock member includes a sleeve portion mounted around the needle holding portion and a guide lock portion extending longitudinally and proximally from the outside of the sleeve portion.

Preferably, the protection member includes a sleeve portion provided around the needle holding portion on a distal side of the sleeve portion of the guide lock member, an arm portion extending from the outside of the sleeve portion of the protection member in the longitudinal direction to the proximal side, and the arm The finger touches the part at the proximal end of the part.

Preferably, the mechanism for releasably maintaining the protection member in the non-actuated position includes a spring piece on the guide lock portion of the guide lock member and a protrusion provided on the arm portion of the protection member in the longitudinal direction on the side facing the spring piece. In the non-actuated position, at least a portion of the shrapnel on the guide lock portion is received on the distal side of the projection to maintain the protection member in the non-actuated position, and the projection is shaped to allow application of a finger to the finger contact portion of the protection member. When a finger is applied on the far side, the elastic piece on the guide lock portion rises upwards to release the protective member from the unactuated position.

Preferably, the mechanism for guiding the protection member to move from the unactuated position to the actuated position includes at least one longitudinal guide groove on the guide lock portion of the guide lock member and at least one corresponding longitudinal protrusion on the arm portion of the protection member. Edge, in the unactuated position, the distal portion of the longitudinal flange is located in the longitudinal guide groove, and the longitudinal guide groove and the longitudinal flange are shaped to allow a distal finger force to be applied to the finger contact portion of the protective member, The longitudinal flange slides distally along the longitudinal guide groove until the finger contact portion contacts the guide lock portion and stops.

Preferably, the mechanism for locking the protection member in the actuated position includes a spring piece on the guide lock portion of the guide lock member and a projection provided on the arm portion of the protection member in the longitudinal direction on the side facing the spring piece and the proximal end of the protection member. At least one guide protrusion provided at the place corresponding to at least one recess provided on the guide lock portion of the lock member, when the protection member moves from the unactuated position to the actuated position, the elastic piece can pass over the projection and be caught on the projection The block is proximal, and the guide projection is received in the depression to lock the protective member in the actuated position in a manner that forms a slope with the longitudinal axis.

Preferably, a protruding portion or a recessed portion is provided on an inner side of the sleeve portion of the guide locking member, and the protruding portion or the recessed portion engages a recessed portion or a protruding portion formed on the outer side of the needle holding portion to axially guide the sleeve portion of the locking member. Snaps onto the syringe.

Preferably, the sleeve portion of the protection member is formed in a cap shape with a top opening, and the hole diameter of the top opening is smaller than the inner diameter of the sleeve portion body of the protection member.

Preferably, the finger contact portion is formed as a plate-like portion extending laterally outward from the proximal end of the arm portion of the protective member.

According to the present invention, since the safety mechanism is mounted on the needle holding portion of the syringe, the safety mechanism can be installed before the needle is assembled when the syringe is assembled, so that the needle needs to be calibrated only once, and the safety mechanism is not activated before the safety mechanism is activated. Interfere with the needle.

According to the present invention, the safety mechanism can rotate freely around the needle holding portion of the syringe, so as to facilitate the identification of the needle tip surface.

According to the present invention, the safety mechanism follows the inclination formed when the guide convex portion at the proximal end of the protection member and the recessed portion of the guide lock member are compounded to achieve the purpose of the needle tip to one side, so that the needle tip is hidden in the protective cover.

In addition, compared with the prior art, the safety syringe according to the present invention has a simple structure, a smooth surface, one-handed operation, and better protection of the needle, thereby preventing accidental puncture injuries caused by the needle.

1‧‧‧ safety syringe

2‧‧‧ syringe

3‧‧‧ proximal

4‧‧‧ remote

5‧‧‧ chamber

6‧‧‧ Needle holding section

7‧‧‧ plunger

8‧‧‧ needle

9‧‧‧ Security Agency

10‧‧‧Guide lock member

11‧‧‧Protective member

12‧‧‧ Sleeve

13‧‧‧Guide lock

14‧‧‧ Sleeve

15‧‧‧ arm

16‧‧‧finger contact

17‧‧‧ shrapnel

18‧‧‧ Guide protrusion

19‧‧‧ bump

20‧‧‧Remote

21‧‧‧ longitudinal guide groove

22‧‧‧Longitudinal flange

23‧‧‧ near side

24‧‧‧ protrusion

25‧‧‧ Depression

26‧‧‧ needle shield

27‧‧‧ top opening

28‧‧‧ sleeve body

29‧‧‧ Depression

30‧‧‧ flange

31, 32‧‧‧ rib

33‧‧‧ Wedge-shaped bump

34‧‧‧Slip

FIG. 1 is a perspective view of a safety syringe with a needle shield according to an embodiment of the present invention.

FIG. 2 is a side view of the safety syringe shown in FIG. 1 with the needle shield removed and the safety mechanism in an unactuated position.

Fig. 3 is a sectional view taken along the line A-A in Fig. 2.

FIG. 4 is a partially enlarged view of FIG. 3.

FIG. 5 is a perspective view of the safety syringe shown in FIG. 1 with the needle shield removed.

6 is a side view of the safety syringe shown in FIG. 1 with the needle shield removed and the safety mechanism in an actuated position.

Fig. 7 is a B-B sectional view of Fig. 6.

Fig. 8 is a sectional view taken along the line C-C in Fig. 6.

FIG. 9 is a perspective view of a guide lock member according to an embodiment of the present invention.

FIG. 10 is a perspective view of a protective member according to an embodiment of the present invention.

FIG. 11 is a perspective view of a needle shield according to an embodiment of the present invention.

FIG. 12 is a perspective view of the needle cover of FIG. 11 being engaged with the guide lock member.

The structure and working principle of the safety syringe of the present invention, particularly its safety mechanism, will be explained below with reference to the drawings. However, those with ordinary knowledge in the technical field should understand that the safety mechanism of the present invention is not limited to syringes, but can also be applied to other medical devices, such as blood collection needles. The "proximal", "distal", "proximal", and "distal" mentioned in this article are all relative to the injection operation performed by medical personnel, and the side or end close to the medical personnel performing injection operation is "Proximal" and "proximal", while the side or end remote from the medical staff performing the injection operation is "distal" and "distal".

FIG. 1 is a perspective view of a safety syringe with a needle shield according to an embodiment of the present invention. The safety syringe 1 includes a syringe 2, a plunger 7, a needle 8, a safety mechanism 9, and an optional needle shield 26. The syringe 2 has a proximal end 3, a distal end 4, and a cavity 5 between the proximal end 3 and the distal end 4 that defines a longitudinal axis, and the cavity 5 is used to receive an injection drug or the like. The needle-holding portion 6 extends distally from the distal end 4 of the syringe 2. The needle-holding portion 6 and the syringe 2 may be integrally formed or two components connected together. The needle holding portion 6 has a central needle passage for receiving a part of the needle and holding the needle. The plunger 7 has a distal portion inserted into the syringe 2 from the proximal end 3 of the syringe and a proximal portion located outside the syringe. The needle 8 has a proximal portion inserted into the needle channel of the needle holding portion 6 from the distal side of the needle holding portion 6 and a distal portion located outside the needle holding portion 6. The needle is hollow and inserted into the needle channel of the needle holding portion 6 Inside and in fluid communication with the chamber 5 of the syringe 2. The safety mechanism 9 is installed at least partially around the needle-holding portion 6. In the non-actuated position of the safety mechanism 9, the distal portion of the needle 8 is not covered by the safety mechanism 9. In the activated position of the safety mechanism 9, at least the distal side of the needle 8 The tip is covered by a safety mechanism 9 to prevent accidental contact with the distal tip of the needle 8. The safety mechanism 9 may be made of thermoplastic or any other suitable material. An optional needle shield 26 is used to cover the needle 8 and is shaped to fit the shape of the safety mechanism 9.

The security mechanism 10 according to one embodiment of the present invention will be described in detail below. FIG. 2 is a side view of the safety syringe shown in FIG. 1 with the needle shield removed and the safety mechanism in an unactuated position. Fig. 3 is a sectional view taken along the line A-A in Fig. 2. FIG. 4 is a partially enlarged view of FIG. 3. 2 to 4, the safety mechanism 9 is axially engaged at least partially around the needle holding portion. In another embodiment, the safety mechanism 9 can rotate freely around the needle holding portion, so as to facilitate the identification of the needle tip surface. The safety mechanism 9 includes a guide lock member 10 and a protection member 11. The guide lock member 10 includes a sleeve portion 12 mounted around the needle holding portion 6 and a guide lock portion 13 extending from the outside of the sleeve portion 12 in the longitudinal direction to the proximal side.

A protruding portion 24 may be provided inside the sleeve portion 12 of the guide locking member 10, and the protruding portion 24 may engage a recessed portion 25 formed on the outside of the needle holding portion 6 to axially engage the sleeve portion 12 of the guide locking member 10 on On the syringe. Conversely, a recessed portion may be provided inside the sleeve portion 12 of the guide lock member 10, and the recessed portion may engage a protruding portion formed on the outside of the needle holding portion 6 to axially engage the sleeve portion 12 of the guide lock member 10 with the needle. On the tube. In the embodiment shown in FIG. 2 to FIG. 4, the outer diameter of the needle holding portion 6 is smaller than the outer diameter of the syringe 2, so that a holding shoulder is formed at the boundary between the needle holding portion 6 and the syringe 2, A flange is provided on the portion 6 at a longitudinal distance from the boundary portion, and a recessed portion is formed between the retaining shoulder and the flange to receive the protruding portion 24 inside the sleeve portion 12 of the guide locking member 10. 25 to axially engage the sleeve portion 12 of the guide lock member 10 on the syringe.

The protective member 11 may include a sleeve portion 14 provided around the needle holding portion 6 on the far side of the sleeve portion 12 of the guide lock member 10, and an arm portion extending longitudinally and proximally from the outside of the sleeve portion 14 of the protection member 11 15, and a finger contact portion 16 at the proximal end of the arm portion 15 (see FIG. 10). The finger contact portion 16 of the protective member 11 is preferably formed as a plate-like portion extending laterally outward from the proximal end of the arm portion 15 of the protective member 11. More preferably, small protrusions are provided on the surface of the plate-like portion to increase the tactile sensation when the medical staff pushes the protective member 11 with their fingers. By applying finger pressure to the finger contact portion 16, the protective member 11 can be moved from the unactuated position (shown in FIG. 3) to the actuated position (shown in FIG. 7). In the non-actuated position, the distal portion of the needle 8 is not covered by the protective member 11, and in the activated position, at least the distal end of the needle 8 is covered by the protective member 11.

The guide lock member 10 and the protection member 11 may have a mechanism for releasably holding the protection member 11 in an unactuated position, a mechanism for guiding the protection member 11 to move from an unactuated position to an actuated position, and Mechanism that locks the protective member 11 in the actuated position.

The mechanism for releasably holding the protection member 11 in the unactuated position may include a spring piece 17 (refer to FIG. 9) on the guide lock portion 13 of the guide lock member 10 and an arm portion 15 of the protection member 11 facing the spring piece 17- The protrusion 19 (refer FIG. 10) provided in the longitudinal direction of the side. Preferably, the elastic piece 17 is a protruding piece that protrudes to the far side at an angle from the guide lock portion 13. The protruding piece is provided with a claw that can be clamped on the distal end of the projection 19 on the arm portion 15. 20 to keep the protective member in an unactuated position. According to another embodiment, a plurality of bumps 19 may be provided in the longitudinal direction of the arm portion 15 of the protection member 11. The projection 19 is shaped to allow a finger 17 on the finger protection portion of the protection member to guide the elastic piece 17 on the locking portion 13 over the projection 19 to release the protection member from the unactuated position when a distal finger force is applied.

The mechanism for guiding the protection member 11 to move from the unactuated position to the actuated position includes at least one longitudinal guide groove 21 on the guide lock portion 13 of the guide lock member 10 and at least one corresponding one on the arm portion 15 of the protection member 11 Longitudinal flange 22. Preferably, a longitudinal guide groove 21 is provided on each of the left and right sides of the guide protection portion 13, and a longitudinal flange 22 is provided on each of the arm portions 15 of the protection member 11 corresponding to the longitudinal guide groove 21. In the non-actuated position, the distal portion of the longitudinal flange 22 is located in the longitudinal guide groove 21, and the longitudinal guide groove 21 and the longitudinal flange 22 are shaped to allow application of a distal end to the finger contact portion 16 of the protective member 11. When a finger is applied, the longitudinal flange 22 slides distally along the longitudinal guide groove 21 until the finger contact portion 16 contacts the guide lock portion 13 and stops.

The mechanism for locking the protection member 11 in the actuated position includes a spring piece 17 on the guide lock portion 13 of the guide lock member 10 and a protrusion 19 on the side of the arm portion 15 of the protection member facing the spring piece 17 in the longitudinal direction and the protection member The at least one guide protrusion 18 provided at the proximal end of the and the at least one recess 29 provided on the guide lock portion of the lock member. Preferably, a guide protrusion 18 is provided on each of the right and left sides of the proximal end of the protection member, and a depression 29 is provided on each of the right and left sides of the proximal end of the guide lock portion of the lock member. Further, it is preferable that the sleeve portion 14 of the protection member 11 is formed in a cap shape with a top opening 27, and the diameter of the top opening 27 is smaller than the inner diameter of the sleeve portion main body 28 of the protection member. When the protective member is moved from the unactuated position to the actuated position, the elastic piece 17 can pass over the projection 19 and be caught on the proximal side 23 of the projection 19 (as shown in FIG. 7), and the guide projection 18 is received in the depression 29 (as shown in FIG. 8), this causes the longitudinal axis of the protective member 11 in the actuated position to be angled with the longitudinal axis of the syringe, thereby causing the needle not to align with the top of the cap-shaped sleeve portion 14 of the protective member 11 The opening 27 abuts against the inner wall of the main body of the sleeve portion, further increasing the safety of avoiding needle puncture.

According to another embodiment of the present invention, a mechanism for guiding the locking member 10 and the protective member 11 for releasably holding the protective member in the unactuated position, and for guiding the protective member to move from the unactuated position to the actuated position The mechanism and the mechanism for locking the protection member in the actuated position may include: a projection provided on the guide lock portion of the guide lock member in the longitudinal direction and an elastic piece on the arm portion of the protection member facing the bump side; the guide lock At least one longitudinal flange on the guide lock portion of the member and at least one corresponding longitudinal groove on the arm portion of the protection member; and a projection provided on the guide lock portion of the guide lock member in the longitudinal direction and on the arm portion of the protection member An elastic piece facing the convex side and at least one recessed portion provided at the proximal end of the protection member and at least one convex portion correspondingly provided on the guide lock portion of the lock member, as long as the protection member can be moved from an unactuated position Just go to the actuated position.

FIG. 11 is a perspective view of a needle cover 26 according to an embodiment of the present invention. As shown in the figure, the inner surface of the needle shield 26 is provided with a pair of ribs 31 on both sides of the notch portion, and each pair of ribs 31 is respectively engaged with the flange 30 on the guide lock portion 13 of the guide lock member. In addition, the inner surface of the needle shield 26 is further provided with a pair of ribs 32. Preferably, the pair of ribs 32 are located at a substantially intermediate position of the two pairs of ribs 31 in the circumferential direction and are wedge-shaped on the sleeve portion 12 of the guide locking member. Block 33 is engaged. When the protective member 11 is in the non-actuated position, the needle cover 26 moves from the distal side of the needle 8 to the proximal side to cover the needle 8. During the movement, the rib 31 on the inner surface of the needle cover 26 and the guide of the guide lock member are guided. The flange 30 on the locking portion 13 is slidably engaged, and the rib 32 on the inner surface of the needle cover 26 is press-engaged with the wedge-shaped projection 33 on the sleeve portion 12 that guides the locking member to securely fix the needle cover 26 (see FIG. 12). In addition, the outer surface of the needle shield 26 is provided with a protruding anti-slip strip 34 to facilitate removal of the needle shield 26 during use.

The specific structure of the present invention has been described above with reference to the specific embodiments shown in the accompanying drawings. However, those with ordinary knowledge in the technical field should understand that the specific description above is exemplary, and those with ordinary knowledge in the technical field according to the above Various modifications and improvements can be made to the description without departing from the scope of the present invention.

Claims (28)

    A safety syringe (1) includes a syringe (2) having a proximal end (3), a distal end (4), and a cavity between the proximal end and the distal end and defining a longitudinal axis. A chamber (5), a needle holding portion (6) extending distally from the distal end; a plunger (7) having a distal portion inserted into the syringe from the proximal end of the syringe, and located in the A proximal portion outside the syringe; a needle (8) having a proximal portion inserted into a needle channel of the needle holding portion from the distal side of the needle holding portion and a distal portion located outside the needle holding portion, The needle is hollow and in fluid communication with the chamber of the syringe; and a safety mechanism (9), which is installed at least partially around the needle holding portion, in an unactuated position of the safety mechanism, the distance of the needle The side portion is not covered by the safety mechanism, and at the same position of the safety mechanism, at least the distal end of the needle is covered by the safety mechanism to prevent accidental contact with the distal end of the needle.         The safety syringe (1) according to item 1 of the scope of patent application, wherein the safety mechanism (9) is axially engaged at least partially around the needle holding portion.         The safety syringe (1) according to item 1 of the scope of patent application, wherein the safety mechanism (9) is capable of freely rotating around the needle holding portion.         The safety syringe (1) according to any one of claims 1 to 3, wherein the safety mechanism (9) includes a guide lock member (10) and a protection member (11), the guide A locking member is installed at least partially around the needle-holding portion, and the protective member is provided at least partially around the needle-holding portion and is located on the distal side of the guide locking member, and the protective member can be moved from the unactuated position to the actuated position, at In the non-actuated position, the distal portion of the needle is not covered by the protective member. In the actuated position, at least the distal end of the needle is covered by the protective member. The guide locking member and the protective member have a function of A mechanism for releasably maintaining the protection member in the unactuated position, a mechanism for guiding the protection member to move from the unactuated position to the actuated position, and a mechanism for locking the protection member in the actuated position Mechanism in the moving position.         The safety syringe (1) according to item 4 of the scope of patent application, wherein the guide locking member includes a sleeve portion (12) mounted around the needle holding portion and longitudinally proximally from the outside of the sleeve portion An extended guide lock (13).         The safety syringe (1) according to item 5 of the scope of patent application, wherein the protection member includes a sleeve portion (14) provided on the distal side of the sleeve portion of the guide locking member and surrounding the needle holding portion, An arm portion (15) extending from the outside of the sleeve portion of the protective member to the proximal side in the longitudinal direction, and a finger contact portion (16) at the proximal end of the arm portion.         The safety syringe (1) according to item 6 of the scope of patent application, wherein the mechanism for releasably maintaining the protective member in the unactuated position includes an elastic piece on the guide lock portion of the guide lock member (17) and a protrusion (19) provided in the longitudinal direction on the arm portion of the protective member facing the spring piece (17) in the longitudinal direction, and in the non-actuated position, at least a part of the spring piece on the guide lock portion Received on the distal side of the bump to hold the protective member in the unactuated position, the bump (19) is shaped to allow a distal finger force to be applied to the finger contact portion of the protective member , The elastic piece on the guide lock portion climbs over the projection to release the protective member from the unactuated position.         The safety syringe (1) according to item 7 of the scope of patent application, wherein the mechanism for guiding the protection member to move from the unactuated position to the actuated position includes a guide lock portion of the guide lock member At least one longitudinal guide groove (21) and at least one corresponding longitudinal flange (22) on the arm portion of the protective member, in the unactuated position, a distal portion of the longitudinal flange is located within the longitudinal guide groove The longitudinal guide groove and the longitudinal flange are shaped to allow the longitudinal flange to slide distally along the longitudinal guide groove when a distal finger force is applied to the finger contact portion of the protective member, until the The finger contact portion comes into contact with the guide lock portion and stops.         The safety syringe (1) according to item 8 of the scope of patent application, wherein the mechanism for locking the protection member in the actuated position includes the spring piece and the protection member on the guide lock portion of the guide lock member The projection (19) provided on the arm portion facing the elastic piece (17) in the longitudinal direction and at least one guide projection (18) provided at the proximal end of the protection member and the guide locking member At least one recessed portion (29) correspondingly provided on the guide locking portion, when the protective member moves from the unactuated position to the actuated position, the elastic piece can pass over the convex block and be caught on the proximal side of the convex block And the guide protrusion is received in the depression so that the protective member is locked in the actuated position in such a manner as to form an inclination with the longitudinal axis.         The safety syringe (1) according to item 4 of the scope of patent application, wherein a sleeve (24) or a recessed portion is provided inside a sleeve portion of the guide locking member, and the projection or the recessed portion engages the holding portion. Another recessed portion (25) or another protruding portion formed on the outer side of the needle portion to axially engage the sleeve portion of the guide locking member on the syringe.         The safety syringe (1) according to any one of claims 1 to 3 of the scope of patent application, further comprising a needle cover (26) for covering the needle and being shaped to communicate with the safety mechanism Fit the shape.         The safety syringe (1) according to item 11 of the scope of patent application, wherein the inner surface of the needle shield (26) is provided with at least a pair of ribs (31), the at least a pair of ribs (31) and a guide locking member At least one flange (30) on a guide locking portion (13) is slidably engaged.         The safety syringe (1) according to item 12 of the scope of patent application, wherein the inner surface of the needle shield (26) is further provided with another pair of ribs (32), and the other pair of ribs (32) is locked with the guide A wedge-shaped protrusion (33) on a sleeve portion (12) of the component is press-fitted.         According to the safety syringe (1) according to item 13 of the scope of the patent application, the outer surface of the needle shield (26) is provided with a protruding non-slip strip (34).         The safety syringe (1) according to item 6 of the scope of patent application, wherein the sleeve portion of the protection member is formed in a cap shape with a top opening (27), and the diameter of the top opening is smaller than the protection member The inner diameter of a sleeve part body (28).         The safety syringe (1) according to item 6 of the scope of patent application, wherein the finger contact portion is formed as a plate-like portion extending laterally outward from the proximal end of the arm portion of the protective member.         A safety mechanism (9) for a safety syringe (1), the safety mechanism is installed at least partially around a needle holding portion of the safety syringe, and in an unactuated position of the safety mechanism, a distal portion of a needle is not The safety mechanism covers, and at the same position of the safety mechanism, at least the distal end of the needle is covered by the safety mechanism to prevent accidental contact with the distal end of the needle.         According to the security mechanism (9) according to item 17 of the scope of the patent application, wherein the security mechanism (9) is at least partially axially engaged with the needle holding portion.         According to the safety mechanism (9) according to item 17 of the scope of patent application, wherein the safety mechanism (9) is capable of freely rotating around the needle holding portion.         The security mechanism (9) according to any one of claims 17 to 19 in the scope of patent application, wherein the security mechanism (9) includes a guide locking member (10) and a protection member (11), the guide A locking member is installed at least partially around the needle-holding portion, and the protective member is provided at least partially around the needle-holding portion and is located on the distal side of the guide locking member. In the non-actuated position, the distal portion of the needle is not covered by the protective member. In the actuated position, at least the distal end of the needle is covered by the protective member. The guide locking member and the protective member have a function of A mechanism for releasably maintaining the protection member in the unactuated position, a mechanism for guiding the protection member to move from the unactuated position to the actuated position, and a mechanism for locking the protection member in the actuated position Mechanism in the moving position.         The safety mechanism (9) according to item 20 of the scope of patent application, wherein the guide locking member includes a sleeve portion (12) mounted around the needle holding portion and longitudinally proximally from the outside of the sleeve portion An extended guide lock (13).         The safety mechanism (9) according to item 21 of the scope of patent application, wherein the protection member includes a sleeve portion (14) provided on the distal side of the sleeve portion of the guide locking member and surrounding the needle holding portion, An arm portion (15) extending from the outside of the sleeve portion of the protective member to the proximal side in the longitudinal direction, and a finger contact portion (16) at the proximal end of the arm portion.         The safety mechanism (9) according to item 22 of the scope of patent application, wherein the mechanism for releasably maintaining the protection member in the non-actuated position includes an elastic piece on the guide lock portion of the guide lock member (17) and a protrusion (19) provided in the longitudinal direction on the arm portion of the protective member facing the spring piece (17) in the longitudinal direction, and in the non-actuated position, at least a part of the spring piece on the guide lock portion Received on the distal side of the bump to hold the protective member in the unactuated position, the bump (19) is shaped to allow a distal finger force to be applied to the finger contact portion of the protective member , The elastic piece on the guide lock portion climbs over the projection to release the protective member from the unactuated position.         The safety mechanism (9) according to item 23 of the scope of patent application, wherein the mechanism for guiding the protective member to move from the unactuated position to the actuated position includes a guide lock portion of the guide lock member At least one longitudinal guide groove (21) and at least one corresponding longitudinal flange (22) on the arm portion of the protective member, in the unactuated position, a distal portion of the longitudinal flange is located within the longitudinal guide groove The longitudinal guide groove and the longitudinal flange are shaped to allow the longitudinal flange to slide distally along the longitudinal guide groove when a distal finger force is applied to the finger contact portion of the protective member, until the The finger contact portion comes into contact with the guide lock portion and stops.         The safety mechanism (9) according to item 24 of the scope of patent application, wherein the mechanism for locking the protection member in the actuated position includes the spring piece and the protection member on the guide lock portion of the guide lock member The protrusion (19) provided on the side of the arm portion facing the elastic piece (17) in the longitudinal direction and at least one guide protrusion (18) provided at the proximal end of the protection member and the guide of the guide lock member At least one recessed portion (29) correspondingly provided on the locking portion, when the protection member moves from the unactuated position to the actuated position, the elastic piece can pass over the convex block and be caught on the proximal side of the convex block, And the guide protrusion is received in the depression so that the protection member is locked in the actuated position in such a manner as to form an inclination with a longitudinal axis.         The security mechanism (9) according to item 20 of the scope of patent application, wherein a sleeve (24) or a recessed portion is provided inside a sleeve portion of the guide locking member, and the projection or the recessed portion engages the holding portion. Another recessed portion (25) or another protruding portion formed on the outer side of the needle portion to axially engage the sleeve portion of the guide locking member on a syringe.         The safety mechanism (9) according to item 22 of the scope of patent application, wherein the sleeve portion of the protection member is formed into a cap shape with a top opening (27), and the aperture of the top opening is smaller than the protection The inner diameter of a sleeve part body (28) of the component.         The security mechanism (9) according to item 22 of the scope of patent application, wherein the finger contact portion is formed as a plate-like portion extending laterally outward from a proximal end of the arm portion of the protective member.