CN108619594A - Safety syringe and safety mechanism therefor - Google Patents

Abstract

The invention discloses a safety syringe and a safety mechanism used for the same. The safety syringe (1) comprises: a barrel (2) having a proximal end (3), a distal end (4) and a chamber (5) therebetween defining a longitudinal axis, a needle holder (6) extending distally from the distal end; a plunger (7) having a distal portion inserted into the barrel from the proximal end of the barrel and a proximal portion located outside the barrel; a needle (8) having a proximal portion inserted into the needle channel of the needle holder from the distal side of the needle holder and a distal portion located outside the needle holder, the needle being hollow and in fluid communication with the chamber of the barrel; and a safety mechanism (9) mounted at least partially around the needle-holding portion, in an unactuated position of the safety mechanism, a distal portion of the needle is uncovered by the safety mechanism, and in an actuated position, at least a distal tip of the needle is covered by the safety mechanism to prevent accidental contact with the distal tip of the needle. According to the invention, the safety mechanism can be installed before the needle is installed when the syringe is assembled, so that the needle only needs to be calibrated once and does not interfere with the needle before the safety mechanism is activated.

Description

Safety syringe and safety mechanism therefor

technical field

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

Background technique

Accidental sticking with a used syringe can transmit disease. Accordingly, the prior art teaches syringes with actuatable safety shields that can be positioned to guard against accidental contact with the needle tip after use of the syringe. The prior art safety shield is provided with a stopper for protecting the needle tip, and the stopper has a needle channel, and the needle needs to pass through the needle passage of the stopper to install the safety shield with the stopper during the assembly of the syringe. Needing to calibrate the pins again due to unavoidable touching of the pins during the installation process is time consuming and prone to errors.

Contents of the invention

The present invention aims to solve the above-mentioned problems existing in the prior art.

In one aspect, the present invention provides a safety syringe comprising: a barrel having a proximal end, a distal end and a chamber between the proximal and distal ends and defining a longitudinal axis, the needle holding portion extending from the distal end to the distal Extend; Plunger, it has the distal part that is inserted in the syringe from the proximal end of syringe and the proximal part that is positioned at outside syringe; a proximal portion of and a distal portion positioned outside the needle holder, the needle being hollow and in fluid communication with the chamber of the barrel; and a safety mechanism mounted at least partially around the needle holder in an unactuated position of the safety mechanism , the distal portion of the needle is not covered by the safety mechanism, and 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 engages axially at least partially around said needle holder.

Preferably, the safety mechanism is freely rotatable about the needle holder.

Preferably, the safety mechanism comprises a guiding locking member and a protective member, the guiding locking member is at least partially mounted around the needle holder, the protective member is at least partially arranged around the needle holding portion and is located distally of the guiding locking member, and the protective member can be in an unactuated position. Move to the actuated position, when the non-actuated position, the distal part of the needle is not covered by the protective member, when in the actuated position, at least the distal end of the needle is covered by the protective member, the guide lock member and the protective member have functions for A mechanism for releasably retaining the protective member in the unactuated position, a mechanism for guiding movement of the protective member from the unactuated position to the actuated position, and a mechanism for locking the protective member in the actuated position.

Preferably, the guide lock member includes a sleeve portion mounted around the needle holder portion and a guide lock portion extending longitudinally proximally from an outer side of the sleeve portion.

Preferably, the protective member includes a sleeve portion disposed around the needle holder distally of the sleeve portion of the guide locking member, an arm portion extending proximally in the longitudinal direction from an outer side of the sleeve portion of the protective member, and The finger contact portion at the proximal end of the

Preferably, the mechanism for releasably retaining the protection member in the unactuated position comprises a shrapnel on the guide lock portion of the guide lock member and a projection longitudinally disposed on the side of the arm of the protection member facing the shrapnel, In the actuated position, at least a portion of the shrapnel on the guide lock is received on the far side of the projection to maintain the protective member in the unactivated position, the projection being shaped to allow a distal direction to be applied to the finger contact portion of the protective member. When the finger force is applied from the side, the elastic piece on the guiding locking part goes over the protrusion, so as to release the protection member from the unactuated position.

Preferably, the means for guiding the movement of the guard member from the unactuated position to the activated position comprises at least one longitudinal channel on the guide lock portion of the guide lock member and at least one corresponding longitudinal flange on the arm of the guard member , in the unactuated position, the distal portion of the longitudinal flange is located within the longitudinal channel, the longitudinal channel and the longitudinal flange are shaped to allow the longitudinal The flange slides distally along the longitudinal guide groove until the finger contact portion contacts the guide locking portion to stop.

Preferably, the mechanism for locking the protection member in the actuated position comprises an elastic piece on the guiding locking portion of the guiding locking member, a projection disposed longitudinally on the side of the arm of the protection member facing the elastic piece, and a proximal end of the protection member. At least one guide protrusion provided corresponds to at least one recess provided on the guide locking part of the locking member, when the protection member moves from the non-actuated position to the actuated position, the shrapnel can go over the protrusion and be stuck on the protrusion and the guide protrusion is received in the recess to lock the protective member in an angled manner to the longitudinal axis in the actuated position.

Preferably, the inner side of the sleeve portion of the guide locking member is provided with a protrusion or a depression, and the protrusion or depression engages with the depression or protrusion formed on the outer side of the needle holding portion to axially lock the sleeve portion of the guide locking member. Fit on the needle barrel.

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

Preferably, the inner surface of the needle shield is provided with at least one pair of ribs 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 which press-engage with wedge-shaped projections on the sleeve portion of the guiding locking member.

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

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

Preferably, the finger contact portion is shaped 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 being mounted at least partially around the needle holding portion of the safety syringe, in the 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 engages axially at least partially around the needle holder.

Preferably, the safety mechanism is freely rotatable about the needle holder.

Preferably, the safety mechanism comprises a guiding locking member and a protective member, the guiding locking member is at least partially mounted around the needle holder, the protective member is at least partially arranged around the needle holding portion and is located distally of the guiding locking member, and the protective member can be in an unactuated position. Move to the actuated position, when the non-actuated position, the distal part of the needle is not covered by the protective member, when in the actuated position, at least the distal end of the needle is covered by the protective member, the guide lock member and the protective member have functions for A mechanism for releasably retaining the protective member in the unactuated position, a mechanism for guiding movement of the protective member from the unactuated position to the actuated position, and a mechanism for locking the protective member in the actuated position.

Preferably, the guide lock member includes a sleeve portion mounted around the needle holder portion and a guide lock portion extending longitudinally proximally from an outer side of the sleeve portion.

Preferably, the protective member includes a sleeve portion disposed around the needle holder distally of the sleeve portion of the guide locking member, an arm portion extending proximally in the longitudinal direction from an outer side of the sleeve portion of the protective member, and The finger contact portion at the proximal end of the

Preferably, the mechanism for releasably retaining the protection member in the unactuated position comprises a shrapnel on the guide lock portion of the guide lock member and a projection longitudinally disposed on the side of the arm of the protection member facing the shrapnel, In the actuated position, at least a portion of the shrapnel on the guide lock is received on the far side of the projection to maintain the protective member in the unactivated position, the projection being shaped to allow a distal direction to be applied to the finger contact portion of the protective member. When the finger force is applied from the side, the elastic piece on the guiding locking part goes over the protrusion, so as to release the protection member from the unactuated position.

Preferably, the means for guiding the movement of the guard member from the unactuated position to the activated position comprises at least one longitudinal channel on the guide lock portion of the guide lock member and at least one corresponding longitudinal flange on the arm of the guard member , in the unactuated position, the distal portion of the longitudinal flange is located within the longitudinal channel, the longitudinal channel and the longitudinal flange are shaped to allow the longitudinal The flange slides distally along the longitudinal guide groove until the finger contact portion contacts the guide locking portion to stop.

Preferably, the mechanism for locking the protection member in the actuated position comprises an elastic piece on the guiding locking portion of the guiding locking member, a projection disposed longitudinally on the side of the arm of the protection member facing the elastic piece, and a proximal end of the protection member. At least one guide protrusion provided corresponds to at least one recess provided on the guide locking part of the locking member, when the protection member moves from the non-actuated position to the actuated position, the shrapnel can go over the protrusion and be stuck on the protrusion and the guide protrusion is received in the recess to lock the protective member in an angled manner to the longitudinal axis in the actuated position.

Preferably, the inner side of the sleeve portion of the guide locking member is provided with a protrusion or a depression, and the protrusion or depression engages with the depression or protrusion formed on the outer side of the needle holding portion to axially lock the sleeve portion of the guide locking member. Fit on the needle barrel.

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

Preferably, the finger contact portion is shaped 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 installed on the needle holding part of the syringe, when assembling the syringe, the safety mechanism can be installed first, and then the needle can be installed. interference to the needle.

According to the present invention, the safety mechanism can freely rotate around the needle-holding part of the needle cylinder, so as to identify the surface of the needle tip.

According to the present invention, the safety mechanism achieves the purpose of deflecting the needle point to one side according to the gradient formed when the guide protrusion at the proximal end of the protection member combines with the recess of the guide locking member, so that the needle point is hidden in the protective cover.

In addition, compared with the prior art, the safety syringe according to the present invention is simple in structure, smooth in surface, can be operated with one hand, and has better protection against needles, thereby preventing accidental stab wounds caused by needles.

Description of drawings

Fig. 1 is a perspective view of a safety syringe according to an embodiment of the present invention, wherein the safety syringe is provided with a needle shield.

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

Fig. 3 is a cross-sectional view along line A-A of 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.

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

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

Fig. 8 is a C-C sectional view of Fig. 6 .

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

Fig. 10 is a perspective view of a protection member according to an embodiment of the present invention.

Figure 11 is a perspective view of a needle shield according to one embodiment of the present invention.

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

Detailed ways

The structure and working principle of the safety syringe of the present invention, especially its safety mechanism, will be explained below with reference to the accompanying drawings. However, those skilled in the art should understand that the safety mechanism of the present invention is not limited to syringes, and can also be applied to other medical devices, such as blood collection needles. The "proximal side", "far side", "proximal end" and "distal end" mentioned in this article are all relative to the injection operation of the medical staff, and the side or end close to the medical staff performing the injection operation is "proximal side" and "proximal end", and "distal side" and "distal end" on the side or end away from the medical staff performing the injection.

Fig. 1 is a perspective view of a safety syringe according to an embodiment of the present invention, wherein the safety syringe is provided with a needle shield. The safety syringe 1 comprises a barrel 2 , a plunger 7 , a needle 8 , a safety mechanism 9 and an optional needle shield 26 . The barrel 2 has a proximal end 3, a distal end 4 and between the proximal end 3 and the distal end 4 and defining a longitudinal axis a chamber 5 for containing injectable medicaments and the like. The needle holder 6 extends distally from the distal end 4 of the needle cylinder 2, and the needle holder 6 and the needle cylinder 2 may be integrally formed, or may be two parts connected together. The needle holder 6 has a central needle channel for receiving a part of the needle and holding the needle. The plunger 7 has a distal portion inserted into the barrel 2 from the proximal end 3 of the barrel and a proximal portion located outside the barrel. The needle 8 has a proximal portion inserted into the needle passage of the needle holding portion 6 from the far side of the needle holding portion 6 and a distal portion located outside the needle holding portion 6, the needle is hollow, and is inserted into the needle passage of the needle holding portion 6 Inside and in fluid communication with the chamber 5 of the syringe 2. The safety mechanism 9 is mounted at least partially around the needle holder 6. In the unactuated position of the safety mechanism 9, the distal part of the needle 8 is not covered by the safety mechanism 9. In the actuated position of the safety mechanism 9, at least the distal part 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 can 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 match the shape of the safety mechanism 9 .

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

The inner side of the sleeve portion 12 of the guide locking member 10 may be provided with a protrusion 24 which may engage a recess 25 formed on the outer side of the needle holding portion 6 to axially snap the sleeve portion 12 of the guide locking member 10 in place. on the syringe. Conversely, the inner side of the sleeve portion 12 of the guide locking member 10 may be provided with a recess, which may engage a protrusion formed on the outer side of the needle holding portion 6 to axially engage the sleeve portion 12 of the guide locking member 10 on the needle. on the barrel. In the embodiment shown in Fig. 2 to Fig. 4, the outer diameter of the needle holding part 6 is smaller than the outer diameter of the needle cylinder 2, thereby forming a holding shoulder at the junction of the needle holding part 6 and the needle cylinder 2, A flange is provided on the portion 6 at a longitudinal distance from the junction, between which a recess is formed for receiving the projection 24 inside the sleeve portion 12 of the guiding locking member 10, between said retaining shoulder and said flange 25, so as to axially engage the sleeve part 12 of the guiding locking member 10 on the syringe.

The protective member 11 may include a sleeve portion 14 disposed around the needle holding portion 6 distally of the sleeve portion 12 of the guiding locking member 10, an arm portion extending longitudinally proximally from an outer side of the sleeve portion 14 of the protective member 11 15, and a finger contact portion 16 at the proximal end of the arm portion 15 (refer to FIG. 10 ). The finger contact portion 16 of the protective member 11 is preferably shaped 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-shaped portion, so as to increase the tactile feeling when the medical personnel push the protection member 11 with their fingers. By applying finger pressure to the finger contact portion 16, the protection member 11 can be moved from an unactuated position (as shown in FIG. 3) to an actuated position (as shown in FIG. 7). In the unactuated position the distal part of the needle 8 is not covered by the protective member 11 and in the activated position at least the distal tip of the needle 8 is covered by the protective member 11 .

The guide locking member 10 and the protective member 11 may have a mechanism for releasably maintaining the protective member 11 in the unactuated position, a mechanism for guiding the movement of the protective member 11 from the unactuated position to the actuated position, and a mechanism for guiding the protective member 11 from the unactuated position to the actuated position. A mechanism that locks the protective member 11 in the actuated position.

The mechanism for releasably maintaining the protective member 11 in the unactuated position may include a tab 17 on the guiding locking portion 13 of the guiding locking member 10 (refer to FIG. The sides are along the longitudinally arranged projections 19 (refer to FIG. 10 ). Preferably, the elastic piece 17 is a protruding piece protruding from the guide locking part 13 at an angle to the distal side, and the protruding piece is provided with a claw, and the claw can be stuck on the distal end 20 of the protrusion 19 on the arm part 15 , to hold the protective member in the unactuated position. According to another embodiment, a plurality of protrusions 19 may be provided along the longitudinal direction of the arm portion 15 of the protection member 11 . The lug 19 is shaped to allow the tab 17 on the locking portion 13 to be guided over the lug 19 when a distally directed finger force is applied to the finger contact portion of the protective member to release the protective member from the unactuated position.

The mechanism for guiding the movement of the protection member 11 from the unactuated position to the actuated position comprises at least one longitudinal guide groove 21 on the guide locking portion 13 of the guide locking 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 the left and right sides of the guiding and protecting portion 13 , and correspondingly, a longitudinal flange 22 is provided on the arm portion 15 of the protection member 11 corresponding to the longitudinal guide groove 21 . In the unactuated position, the distal portion of the longitudinal flange 22 is located within the longitudinal channel 21, and the longitudinal channel 21 and the longitudinal flange 22 are shaped to allow a distally directed force to be applied to the finger contact portion 16 of the protective member 11. When fingering, the longitudinal flange 22 slides distally along the longitudinal guide groove 21 until the finger contact portion 16 touches the guide locking portion 13 to stop.

The mechanism for locking the protective member 11 in the actuated position includes the elastic piece 17 on the guiding locking portion 13 of the guiding locking member 10 and the protrusion 19 arranged longitudinally on the side facing the elastic piece 17 on the arm portion 15 of the protective member and the protective member. At least one guide protrusion 18 provided at the proximal end of the lock member and at least one recess 29 provided on the guide lock portion of the locking member. Preferably, a guide protrusion 18 is respectively provided on the left and right sides of the proximal end of the protection member, and correspondingly a recessed portion 29 is respectively provided on the left and right sides of the proximal end of the guiding locking portion of the locking member. And, preferably, the sleeve portion 14 of the protection member 11 is formed in a cap shape with a top opening 27 whose diameter is smaller than the inner diameter of the sleeve portion main body 28 of the protection member. When the protective member moves from the non-actuated position to the actuated position, the elastic piece 17 can go over the protrusion 19 and be stuck on the proximal side 23 of the protrusion 19 (as shown in FIG. 7 ), and the guide protrusion 18 is received in the recess. 29 (as shown in FIG. 8 ), this causes the longitudinal axis of the protective member 11 in the actuated position to be at an angle to the longitudinal axis of the syringe, which in turn causes the needle to not be aligned with the top of the cap-like sleeve portion 14 of the protective member 11 Open hole 27, but leans against on the inner wall of sleeve part main body, has further increased the safety of avoiding needle stick.

According to another embodiment of the invention, the mechanism guiding the locking member 10 and the protective member 11 for releasably maintaining the protective member in the unactuated position, for guiding the movement of the protective member from the unactuated position to the actuated The mechanism of the position, and the mechanism for locking the protection member at the actuation position may include: a projection arranged longitudinally on the guide locking portion of the guide locking member and an elastic piece facing the side of the projection on the arm of the protection member; at least one longitudinal flange on the guiding locking portion of the locking member and at least one corresponding longitudinal groove on the arm of the protecting member; and longitudinally disposed projections on the guiding locking portion of the guiding locking member and the arm of the protecting member At least one recess provided at the proximal end of the upper side facing the protrusion and at least one recess provided at the proximal end of the protection member corresponds to at least one protrusion provided on the guiding locking part of the locking member, as long as it can be realized that the protection member is not in the actuated position. Simply move to the actuated position.

Figure 11 is a perspective view of a needle shield 26 according to one embodiment of the present invention. As shown in the figure, a pair of ribs 31 are respectively provided on the inner surface of the needle shield 26 on both sides of the notch, and each pair of ribs 31 engages with the flanges 30 on the guiding locking portion 13 of the guiding locking member respectively. In addition, the inner surface of the needle shield 26 is also provided with a pair of ribs 32, preferably, the pair of ribs 32 are located in the approximate middle of the two pairs of ribs 31 along the circumferential direction, and are aligned with the wedge-shaped projections on the sleeve portion 12 of the guiding locking member. 33 engagement. When the protective member 11 is in the unactuated position, the needle shield 26 moves from the distal side to the proximal side of the needle 8 to cover the needle 8. During the movement, the rib 31 on the inner surface of the needle shield 26 cooperates with the guide of the guide locking member. Flanges 30 on locking portion 13 are in sliding engagement and ribs 32 on the inner surface of needle shield 26 are press-engaged with wedge-shaped projections 33 on sleeve portion 12 guiding the locking member to securely secure needle shield 26 (see FIG. 12). In addition, a protruding anti-slip strip 34 is provided on the outer surface of the needle shield 26 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, but those skilled in the art should understand that the above specific description is exemplary, and those skilled in the art can make various modifications according to the above description and improvements without departing from the scope of the present invention.

Claims (28)

1. A safety syringe (1), comprising: A barrel (2) having a proximal end (3), a distal end (4) and a chamber (5) between the proximal end and the distal end defining a longitudinal axis, the needle holder (6) extending from said distal end extend distally; A plunger (7) having a distal portion inserted into the barrel from the proximal end of the barrel and a proximal portion positioned outside the barrel; A needle (8) having a proximal portion inserted into the needle channel of the needle holder from the far side of the needle holder and a distal portion positioned outside the needle holder, the needle being hollow and connected to the barrel of the needle the chambers are in fluid communication; and A safety mechanism (9) mounted at least partially around said needle holder, in an unactuated position of said safety mechanism, the distal portion of said needle is not covered by said safety mechanism, in said safety mechanism actuated In the active position, 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. 2. Safety syringe (1 ) according to claim 1 , wherein the safety mechanism (9) snaps axially at least partially around the needle holder. 3. The safety syringe (1) according to claim 1, wherein the safety mechanism (9) is freely rotatable around the needle holder. 4. The safety syringe (1) according to any one of claims 1 to 3, wherein the safety mechanism (9) comprises a guide locking member (10) and a protection member (11), the guide locking member being at least Partially mounted around the needle holder, the protective member is disposed at least partially around the needle holder and is located distally of the guiding locking member, the protective member is movable from an unactuated position to an actuated position, in In the unactivated position, the distal portion of the needle is not covered by the protective member, in the activated position, at least the distal end of the needle is covered by the protective member, the guiding locking member and the The protective member has a mechanism for releasably retaining the protective member in an unactuated position, a mechanism for guiding movement of the protective member from the unactuated position to an actuated position, and a mechanism for moving the protective member Mechanism locked in actuated position. 5. Safety syringe (1) according to claim 4, wherein said guiding locking member comprises a sleeve portion (12) mounted around said needle holder and extending longitudinally from the outside of said sleeve portion Side extending guide lock (13). 6. Safety syringe (1 ) according to claim 5, wherein the protective member comprises a sleeve portion (14) arranged around the needle holder distally of the sleeve portion of the guiding locking member, An arm (15) extending longitudinally proximally from the outside of the sleeve portion of the protective member, and a finger contact portion (16) at a proximal end of the arm. 7. A safety syringe (1) according to claim 6, wherein the means for releasably retaining the protective member in the unactuated position comprises a shrapnel (17) on the guide lock portion of the guide lock member. ) and the projection (19) arranged longitudinally on the side of the arm of the protective member facing the elastic piece (17). the distal side of the protrusion to hold the protective member in the unactuated position, the protrusion (19) is shaped to allow when a distally directed finger force is applied to the finger contact portion of the protective member, The elastic piece on the guide locking part goes over the protrusion to release the protection member from the non-actuated position. 8. The safety syringe (1 ) according to claim 7, wherein the means for guiding the movement of the guard member from the unactuated position to the actuated position comprises at least one on a guide lock portion of the guide lock member A longitudinal channel (21) and at least one corresponding longitudinal flange (22) on the arm of said protective member, the distal portion of said longitudinal flange being located within said longitudinal channel in the unactuated position , the longitudinal channel and the longitudinal flange are shaped to allow the longitudinal flange to slide distally along the longitudinal channel when a distally directed finger force is applied to the finger contact portion of the protective member, until the finger contact portion touches the guide locking portion to stop. 9. Safety syringe (1) according to claim 8, wherein the mechanism for locking the protective member in the actuated position comprises the shrapnel on the guide locking portion of the guide locking member together with the guard The protrusion (19) arranged longitudinally on the side facing the elastic piece (17) on the arm of the member and at least one guide protrusion (18) arranged at the proximal end of the protection member are connected with the locking member At least one concave portion (29) is correspondingly provided on the guiding and locking portion of the guide locking portion, when the protection member moves from the unactuated position to the actuated position, the elastic piece can pass over the protrusion and be stuck on the protrusion and the guide protrusion is received in the recess to lock the protective member in an angled manner to the longitudinal axis in the actuated position. 10. The safety syringe (1) according to claim 4, wherein the inner side of the sleeve part of the guide locking member is provided with a protrusion (24) or a recess, which engages the needle holder A recess (25) or a protrusion formed on the outer side of the guide lock member axially engages the sleeve portion of the guide lock member on the barrel. 11. The safety syringe (1) according to any one of claims 1 to 3, further comprising a needle shield (26) for covering the needle and being shaped to match the shape of the safety mechanism match. 12. The safety syringe (1) according to claim 11, wherein the inner surface of the needle shield (26) is provided with at least one pair of ribs (31), said at least one pair of ribs (31) being in contact with the guide At least one flange (30) on the guiding locking portion (13) of the locking member is in sliding engagement. 13. The safety syringe (1) according to claim 12, wherein the inner surface of the needle shield (26) is further provided with a pair of ribs (32), the pair of ribs (32) being in contact with the guide locking member The wedge-shaped protrusions (33) on the sleeve part (12) of the sleeve part (12) are press-engaged. 14. The safety syringe (1) according to claim 13, wherein the outer surface of the needle shield (26) is provided with a protruding anti-slip strip (34). 15. The safety syringe (1) according to claim 6, wherein the sleeve portion of the protective member is formed in the shape of a cap with a top opening (27) having a diameter smaller than that of the protective member. The inner diameter of the sleeve part body (28) of the component. 16. The safety syringe (1 ) according to claim 6, wherein the finger contact portion is shaped as a plate-like portion extending laterally outward from the proximal end of the arm portion of the protective member. 17. A safety mechanism (9) for a safety syringe (1), said safety mechanism being mounted at least partially around the needle holder of the safety syringe, in the unactuated position of said safety mechanism, the distal side of said needle Partially uncovered 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. 18. The safety mechanism (9) according to claim 17, wherein the safety mechanism (9) snaps axially at least partially around the needle holder. 19. The safety mechanism (9) according to claim 17, wherein the safety mechanism (9) is freely rotatable around the needle holder. 20. The safety mechanism (9) according to any one of claims 17 to 19, wherein the safety mechanism (9) comprises a guide locking member (10) and a protection member (11), the guide locking member being at least Partially mounted around the needle holder, the protective member is disposed at least partially around the needle holder and is located distally of the guiding locking member, the protective member is movable from an unactuated position to an actuated position, in In the unactivated position, the distal portion of the needle is not covered by the protective member, in the activated position, at least the distal end of the needle is covered by the protective member, the guiding locking member and the The protective member has a mechanism for releasably retaining the protective member in an unactuated position, a mechanism for guiding movement of the protective member from the unactuated position to an actuated position, and a mechanism for moving the protective member Mechanism locked in actuated position. 21. Safety mechanism (9) according to claim 20, wherein said guiding locking member comprises a sleeve portion (12) mounted around said needle holder portion and approaching longitudinally from the outside of said sleeve portion. Side extending guide lock (13). 22. Safety mechanism (9) according to claim 21, wherein said protective member comprises a sleeve portion (14) arranged around said needle holder distally of the sleeve portion of said guiding locking member, An arm (15) extending longitudinally proximally from the outside of the sleeve portion of the protective member, and a finger contact portion (16) at a proximal end of the arm. 23. A safety mechanism (9) according to claim 22, wherein the means for releasably retaining the protective member in the unactuated position comprises a spring (17) on the guide lock portion of the guide lock member. ) and the projection (19) arranged longitudinally on the side of the arm of the protective member facing the elastic piece (17). the distal side of the protrusion to hold the protective member in the unactuated position, the protrusion (19) is shaped to allow when a distally directed finger force is applied to the finger contact portion of the protective member, The elastic piece on the guide locking part goes over the protrusion to release the protection member from the non-actuated position. 24. Safety mechanism (9) according to claim 23, wherein the means for guiding the movement of the protection member from the unactuated position to the actuated position comprises at least one A longitudinal channel (21) and at least one corresponding longitudinal flange (22) on the arm of said protective member, the distal portion of said longitudinal flange being located within said longitudinal channel in the unactuated position , the longitudinal channel and the longitudinal flange are shaped to allow the longitudinal flange to slide distally along the longitudinal channel when a distally directed finger force is applied to the finger contact portion of the protective member, until the finger contact portion touches the guide locking portion to stop. 25. Safety mechanism (9) according to claim 24, wherein the mechanism for locking the protective member in the actuated position comprises the shrapnel on the guide locking portion of the guide locking member and the guard The protrusion (19) arranged longitudinally on the side facing the elastic piece (17) on the arm of the member and at least one guide protrusion (18) arranged at the proximal end of the protection member are connected with the locking member At least one concave portion (29) is correspondingly provided on the guiding and locking portion of the guide locking portion, when the protection member moves from the unactuated position to the actuated position, the elastic piece can pass over the protrusion and be stuck on the protrusion and the guide protrusion is received in the recess to lock the protective member in an angled manner to the longitudinal axis in the actuated position. 26. Safety mechanism (9) according to claim 20, wherein the inner side of the sleeve portion of the guide locking member is provided with a protrusion (24) or a recess which engages the needle holder A recess (25) or a protrusion formed on the outer side of the guide lock member axially engages the sleeve portion of the guide lock member on the barrel. 27. The safety mechanism (9) according to claim 22, wherein the sleeve portion of the protection member is formed in the shape of a cap with a top opening (27) having a diameter smaller than that of the protection member. The inner diameter of the sleeve part body (28) of the component. 28. Safety mechanism (9) according to claim 22, wherein the finger contact portion is shaped as a plate-like portion extending laterally outward from the proximal end of the arm portion of the protective member.