CN111939394A - A syringe needle protection device - Google Patents

Abstract

The invention discloses a syringe needle protection device, which relates to the technical field of medical equipment. A syringe fixing sleeve includes a sliding connecting sleeve and a supporting and fixing part. One end of the sliding connecting sleeve is fixedly connected with the supporting and fixing part, and the other end of the sliding connecting sleeve is sleeved on the needle. One end of the protective sleeve, the other end of the needle protective sleeve is provided with a needle inlet and outlet, and an elastic support seat is fixed in the needle protective sleeve. In order to support and fix the needle cylinder, pushing the needle cylinder fixing sleeve can make the needle cylinder squeeze the elastic support seat and make the needle protrude from the needle inlet and outlet. When the needle extends out of the needle inlet and outlet, the locking device can connect the needle protective sleeve to the sliding connection sleeve After locking and unlocking the locking device, the needle can be ejected back into the needle protective sleeve. The structure is simple, the needle of the syringe can be protected, the contamination and accidental injury caused by the exposure of the needle can be avoided, the needle can be reused, and the cost is reduced.

Description

A syringe needle protection device

technical field

The invention relates to the technical field of medical instruments, in particular to a syringe needle protection device.

Background technique

Once the needle protective cover is removed from the syringes currently on the market, the needle is exposed, and the needle is likely to come into contact with other objects, which may cause contamination of the needle, and the exposed needle may easily cause accidental injury. Therefore, needle contamination and accidental injury caused by the exposure of syringe needles is a problem that needs to be solved urgently.

In the prior art, such as patent CN200580042856.4, by adding a spring at the needle part of the front end of the syringe, before injection, the needle is in the syringe sleeve. During injection, the needle is stuck at the front end of the sleeve for injection. The spring springs the needle back into the sleeve so that the needle is not exposed before or after use. However, the above solutions are devoted to transforming the syringe itself, which is complicated to manufacture. After the improved syringe is used, it still needs to be processed centrally. Although the purpose is achieved, the cost is relatively high.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a syringe needle protection device to solve the problems existing in the prior art, which has a simple structure, can protect the syringe needle, avoid contamination and accidental injury caused by needle exposure, can be reused, and reduce costs.

For achieving the above object, the present invention provides the following scheme:

The invention provides a syringe needle protection device, comprising a syringe fixing sleeve, a needle protecting sleeve and a locking device. The syringe fixing sleeve includes a sliding connecting sleeve and a supporting and fixing part, and one end of the sliding connecting sleeve is connected to the supporting and fixing part. Fixed connection, the other end of the sliding connection sleeve is sleeved on one end of the needle protective sleeve and is slidably connected with the needle protective sleeve, the other end of the needle protective sleeve is provided with a needle inlet and outlet, and the needle protective sleeve is provided with a One end of the needle inlet and outlet is fixed with an elastic support seat, the end of the syringe with the needle is inserted through the sliding connection sleeve and extends into the needle protective sleeve, and the supporting and fixing part is used to support and fix the needle cylinder, The needle protective cover is used to protect the needle. Pushing the needle barrel fixing cover can make the needle barrel squeeze the elastic support seat and make the needle stick out from the needle inlet and outlet. When the needle sticks out of the needle inlet and outlet, The locking device can lock the needle protective sleeve and the sliding connection sleeve. After unlocking the locking device, the needle can be bounced back into the needle protective sleeve under the rebounding action of the elastic support seat.

Preferably, the supporting and fixing portion includes a lateral supporting plate, a vertical supporting plate and a paddle, the lateral supporting plate is perpendicular to the axis of the sliding connection sleeve, and one end of the lateral supporting plate is fixedly connected to the sliding connection On the outer peripheral surface of the sleeve, the other end of the lateral support plate is fixedly connected to the vertical support plate, the vertical support plate is perpendicular to the lateral support plate, and the paddle is rotatably connected to the vertical support plate On the surface, the lateral support plate is used to support the tail wing at the rear end of the needle cylinder, and rotating the paddle can clamp and fix the tail wing between the lateral support plate and the paddle.

Preferably, the elastic support base comprises a telescopic tube, a spring stopper and a return spring, the bottom end of the telescopic tube is fixedly connected in the needle protective sleeve, the telescopic tube is communicated with the needle inlet and outlet, and the spring The blocking piece is fixedly connected to the outer peripheral surface of the top end of the telescopic tube, the telescopic tube can be extended and retracted along the axial direction of the telescopic tube, the return spring is sleeved outside the telescopic tube, and the spring blocking piece is axially opposite to the outer surface of the telescopic tube. The return spring forms a stop.

Preferably, the locking device includes a first elastic protrusion, the first elastic protrusion is fixedly arranged on the side wall of the needle protective sleeve, and the side wall of the sliding connection sleeve is provided with a locking hole, and the needle protrudes out of the hole. When the needle is in and out, the first elastic protrusion is clamped in the locking hole to lock the needle protective sleeve and the sliding connection sleeve.

Preferably, the locking device further comprises a second elastic protrusion, the second elastic protrusion is fixedly arranged on the side wall of the needle protective sleeve and is located directly above the first elastic protrusion, and the needle is located on the needle When inside the protective sleeve, the second elastic protrusion is clamped in the locking hole to lock the needle protective sleeve and the sliding connection sleeve.

Preferably, the locking device includes a clamping block, the clamping block is fixedly arranged on the outer side wall of the needle protective sleeve, and the side wall of the sliding connection sleeve is provided with a vertical groove and two upper and lower vertical grooves respectively. The upper transverse groove and the lower transverse groove are connected at the ends. When the needle extends out of the needle inlet and outlet, the clamping block is clamped in the upper transverse groove to lock the needle protective sleeve and the sliding connection sleeve; the needle When located in the needle protective sleeve, the clamping block is clamped in the lower transverse groove to lock the needle protective sleeve and the sliding connection sleeve.

Preferably, the first elastic protrusion includes a first fixed blocking piece, a first movable snap protrusion, a first limiting plate and a first spring, and the first fixed blocking piece is fixedly arranged on the inner side wall of the needle protective sleeve On the side wall of the needle protective sleeve, there is a first sliding hole at a position corresponding to the first fixed blocking piece, and one end of the first movable snap protrusion passes through the first sliding hole to the outside of the needle protective sleeve. The other end of the first movable snap protrusion is fixedly provided with the first limit plate, the first limit plate cannot pass through the first sliding hole, and one end of the first spring is fixedly connected to the On the first fixed blocking piece, the other end of the first spring extends into the first movable locking protrusion.

Preferably, the second elastic protrusion includes a second fixed blocking piece, a second movable snap protrusion, a second limiting plate and a second spring, and the second fixed blocking piece is fixedly arranged on the inner side wall of the needle protective sleeve On the side wall of the needle protective sleeve, a second sliding hole is provided at a position corresponding to the second fixed blocking piece, and one end of the second movable clip goes through the second sliding hole to the outside of the needle protective sleeve. The other end of the second movable snap protrusion is fixedly provided with the second limit plate, the second limit plate cannot pass through the second sliding hole, and one end of the second spring is fixedly connected to the second limit plate. On the second fixed blocking piece, the other end of the second spring extends into the second movable locking protrusion.

Preferably, the spring blocking piece includes a funnel-shaped blocking piece and an annular blocking piece, the upper edge of the funnel-shaped blocking piece is fixedly connected to the inner ring of the annular blocking piece, and the lower edge of the funnel-shaped blocking piece is fixedly connected to the telescopic tube On the outer peripheral surface of the top end, the funnel-shaped baffle is used to support the end of the syringe that is connected to the needle.

Preferably, a limit block is fixed on the inner wall of the needle protective sleeve, the limit block is located above the spring block, and when the spring block bounces up, the limit block can The spring stopper is used to limit the position.

The present invention has achieved the following technical effects with respect to the prior art:

The invention provides a syringe needle protection device. The syringe is inserted into the needle protection sleeve, and the syringe is fixed by the syringe fixing sleeve. At this time, the needle is located in the needle protection sleeve. When the syringe is used, the needle is pushed by the syringe fixing sleeve. Extend the needle protective cover and lock the syringe barrel with the needle protective cover through the locking device, and then use the syringe. After use, unlock the locking device, and bounce the needle back into the needle protective cover through the elastic support seat , the structure is simple, the syringe needle can be protected before and after the use of the syringe to avoid contamination and accidental injury caused by the exposure of the needle, when the syringe is used, the syringe can be removed, and a new syringe can be inserted into the needle protective sleeve. The invented syringe needle protection device can be reused, thereby avoiding the disadvantage of high cost caused by the modification of the syringe itself in the past.

Description of drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the accompanying drawings required in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some of the present invention. In the embodiments, for those of ordinary skill in the art, other drawings can also be obtained according to these drawings without any creative effort.

Fig. 1 is the structural representation of the syringe needle protection device when the needle is located in the syringe barrel in the first embodiment;

2 is a schematic structural diagram of the syringe needle protection device when the needle extends out of the barrel in Embodiment 1;

Fig. 3 is a partial enlarged view of part A in the syringe needle protection device in Fig. 1;

Fig. 4 is a partial enlarged view of part B in the syringe needle protection device in Fig. 1;

Fig. 5 is the partial enlarged view of C part in the syringe needle protection device in Fig. 2;

6 is a schematic structural diagram of the syringe needle protection device when the needle extends out of the barrel in Embodiment 2;

7 is a partial cross-sectional view of D-D in the syringe needle protection device of FIG. 6;

In the figure, 1- needle cylinder fixing sleeve, 2- needle protective sleeve, 3- sliding connection sleeve, 4- needle inlet and outlet, 5- elastic support seat, 6- horizontal support plate, 7- vertical support plate, 8- pick , 9- telescopic tube, 10- spring flap, 11- return spring, 12- first elastic protrusion, 13- locking hole, 14- second elastic protrusion, 15- block, 16- vertical groove, 17 -upper transverse slot, 18-lower transverse slot, 19-first fixed block, 20-first movable snap protrusion, 21-first spring, 22-first limit plate, 23-second fixed block, 24 - The second movable clip, 25 - the second spring, 26 - the second limit plate.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

The purpose of the present invention is to provide a syringe needle protection device to solve the problems existing in the prior art, which has a simple structure, can protect the syringe needle, avoids contamination and accidental injury caused by needle exposure, can be reused, and reduces costs.

In order to make the above objects, features and advantages of the present invention more clearly understood, the present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.

Example 1

As shown in Figures 1-2, this embodiment provides a syringe needle protection device, including a syringe fixing sleeve 1, a needle protecting sleeve 2 and a locking device. The syringe fixing sleeve 1 includes a sliding connecting sleeve 3 and a supporting and fixing part. One end of the connecting sleeve 3 is fixedly connected with the supporting and fixing part, and the other end of the sliding connecting sleeve 3 is sleeved on one end of the needle protective sleeve 2 and is slidably connected with the needle protective sleeve 2. The other end of the needle protective sleeve 2 is provided with a needle inlet and outlet 4. The needle protective sleeve 2. An elastic support seat 5 is fixed inside the end provided with the needle inlet and outlet 4. The end of the syringe with the needle passes through the sliding connecting sleeve 3 and extends into the needle protective sleeve 2. The supporting and fixing part is used to support and fix the needle cylinder. The needle protection cover 2 is used to protect the needle. Pushing the needle cylinder fixing sleeve 1 can make the needle cylinder squeeze the elastic support seat 5 and make the needle head protrude from the needle head inlet and outlet 4. When the needle head extends out of the needle head inlet and outlet 4, the locking device can lock it. The needle protective sleeve 2 is locked with the sliding connection sleeve 3 . After the locking device is unlocked, the needle can be bounced back into the needle protective sleeve 2 under the rebound action of the elastic support seat 5 .

When using, insert the syringe into the needle protective sleeve 2, and fix the syringe through the syringe fixing sleeve 1. At this time, the needle is located in the needle protective sleeve 2. When using the syringe, push the syringe fixing sleeve 1 to extend the needle out of the needle. Protective sleeve 2 and lock the syringe fixing sleeve 1 and the needle protective sleeve 2 through the locking device, and then use the syringe. After use, unlock the locking device, and bounce the needle back to the needle protective sleeve through the elastic support seat 5 2, the structure is simple, the syringe needle can be protected before and after the use of the syringe, to avoid contamination and accidental injury caused by needle exposure, when the syringe is used, the syringe can be removed, and a new syringe can be inserted into the needle protective sleeve 2, and the above operations are repeated , the syringe needle protection device of the present invention can be reused, thereby avoiding the disadvantage of high cost caused by the modification of the syringe itself in the past, the syringe needle protection device of the present invention can be reused, and the production cost is reduced.

As shown in FIG. 3 , in this embodiment, the supporting and fixing portion includes a lateral supporting plate 6 , a vertical supporting plate 7 and a paddle 8 . The lateral supporting plate 6 is perpendicular to the axis of the sliding connection sleeve 3 , and one end of the lateral supporting plate 6 is It is fixedly connected to the outer peripheral surface of the sliding connection sleeve 3, the other end of the lateral support plate 6 is fixedly connected to the vertical support plate 7, the vertical support plate 7 is perpendicular to the lateral support plate 6, and the paddle 8 is rotatably connected to the vertical support plate 7. On the surface, the lateral support plate 6 is used to support the tail wing at the rear end of the needle cylinder, and the rotating paddle 8 can clamp and fix the tail wing between the lateral support plate 6 and the paddle 8 . The tail wing at the rear end of the needle cylinder is fixed on the lateral support plate 6 through the pick 8, so that the needle cylinder is fixedly arranged in the needle cylinder fixing sleeve 1, and the installation and disassembly are convenient and quick. The needle is pushed out of the needle protective cover 2, which is easy to operate.

As shown in FIG. 4 , in this embodiment, the elastic support base 5 includes a telescopic tube 9 , a spring baffle 10 and a return spring 11 . The bottom end of the telescopic tube 9 is fixedly connected in the needle protective sleeve 2 , and the telescopic tube 9 is connected to the needle inlet. The outlet 4 is connected, the spring blocking piece 10 is fixedly connected to the outer peripheral surface of the top end of the telescopic tube 9, the telescopic tube 9 can expand and contract axially along the telescopic tube 9, the return spring 11 is sleeved outside the telescopic tube 9, and the spring blocking piece 10 is reset in the axial direction. The spring 11 forms a stop. Push down the syringe fixing sleeve 1, the syringe squeezes the spring stopper 10 and compresses the return spring 11 to shorten the telescopic tube 9, push the needle out of the needle protective sleeve 2, and use the syringe. After use, unlock the locking device, Under the rebound action of the return spring 11 , the spring blocking piece 10 is bounced upward, and the telescopic tube 9 is extended, thereby driving the needle to return to the needle protective sleeve 2 .

As shown in FIGS. 1-2 and 5 , in this embodiment, the locking device includes a first elastic protrusion 12 , the first elastic protrusion 12 is fixedly arranged on the side wall of the needle protective sleeve 2 , and the side wall of the sliding connection sleeve 3 is slidably connected. There is a locking hole 13 on it. When the needle extends out of the needle inlet and outlet 4, the first elastic protrusion 12 is clamped in the locking hole 13 to lock the needle protective sleeve 2 and the sliding connection sleeve 3, which is convenient for the use of the syringe. The needle can be retracted into the needle protective sleeve 2 by the first elastic protrusion 12 and pushing the needle cylinder fixing sleeve 1 upward.

As shown in FIGS. 1-2 and 5 , in this embodiment, the locking device further includes a second elastic protrusion 14 , and the second elastic protrusion 14 is fixedly arranged on the side wall of the needle protective sleeve 2 and located on the first elastic protrusion When the needle is located in the needle protection cover 2, the second elastic protrusion 14 is snapped into the locking hole 13 to lock the needle protection cover 2 and the sliding connection cover 3, so as to ensure that the needle can be stably placed in the needle protection cover In the sleeve 2, the needle will not be separated from the needle protection sleeve 2 because the needle cylinder fixing sleeve 1 is separated from the needle protection sleeve 2.

As shown in FIGS. 1-2 and 5 , in this embodiment, the first elastic protrusion 12 includes a first fixed blocking piece 19 , a first movable snap protrusion 20 , a first limit plate 22 and a first spring 21 . The first fixed blocking piece 19 is fixedly arranged on the inner side wall of the needle protective sleeve 2 , the side wall of the needle protective sleeve 2 is provided with a first sliding hole at a position corresponding to the first fixed blocking piece 19 , and one end of the first movable locking protrusion 20 passes through the first sliding hole. A sliding hole protrudes out of the needle protective sleeve 2 , the other end of the first movable latch 20 is fixedly provided with a first limiting plate 22 , the first limiting plate 22 cannot pass through the first sliding hole, and one end of the first spring 21 is fixed Connected to the first fixed blocking piece 19 , the other end of the first spring 21 extends into the first movable latching protrusion 20 . The first movable locking protrusion 20 can elastically slide in the first sliding hole under the action of the first spring 21 , and the first movable locking protrusion 20 is clamped in the locking hole 13 to lock the needle protective sleeve 2 and the sliding connection sleeve 3 . When the needle sticks out of the needle protective cover 2, when the needle needs to be pushed back to the needle protective cover 2, the first movable snap protrusion 20 is pressed and the sliding connection cover 3 is pushed upward.

As shown in FIGS. 1-2 and 5 , in this embodiment, the second elastic protrusion 14 includes a second fixed blocking piece 23 , a second movable snap protrusion 24 , a second limiting plate 26 and a second spring 25 , The second fixed blocking piece 23 is fixedly arranged on the inner side wall of the needle protective cover 2 , and a second sliding hole is formed on the side wall of the needle protective cover 2 corresponding to the second fixed blocking piece 23 , and one end of the second movable locking protrusion 24 passes through the The two sliding holes protrude out of the needle protective sleeve 2 , the other end of the second movable latching protrusion 24 is fixedly provided with a second limiting plate 26 , the second limiting plate 26 cannot pass through the second sliding hole, and one end of the second spring 25 is fixed Connected to the second fixed blocking piece 23 , the other end of the second spring 25 extends into the second movable locking protrusion 24 . The second movable locking protrusion 24 can elastically slide in the second sliding hole under the action of the second spring 25 , and the second movable locking protrusion 24 is clamped in the locking hole 13 to lock the needle protective sleeve 2 and the sliding connection sleeve 3 . When the needle is located in the needle protective sleeve 2, when the needle needs to be pushed out of the needle protective sleeve 2, the second movable snap protrusion 24 is pressed and the sliding connecting sleeve 3 is pushed downward.

As shown in FIGS. 1-2 and 4, in this embodiment, the spring blocking piece 10 includes a funnel-shaped blocking piece and an annular blocking piece, the upper edge of the funnel-shaped blocking piece is fixedly connected with the inner ring of the annular blocking piece, and the lower edge of the funnel-shaped blocking piece is It is fixedly connected to the outer peripheral surface of the top end of the telescopic tube 9, and the funnel-shaped baffle is used to support the end of the syringe that is connected to the needle. Through the contact between the funnel-shaped blocking piece and the needle cylinder, the needle cylinder can be axially positioned, so that the needle head can pass through the center of the telescopic tube 9 and can enter and exit from the needle head inlet and outlet 4 .

As shown in FIG. 1 and FIG. 4 , in this embodiment, a limit block is fixed on the inner wall of the needle protective sleeve 2 , and the limit block is located above the spring block 10 . When the spring block 10 bounces up, the limit block is The blocking piece can limit the position of the spring blocking piece 10 , wherein, in this embodiment, the first fixed blocking piece 19 is equivalent to a limiting blocking piece, and the spring blocking piece 10 can be limited by the first fixed blocking piece 19 , Prevent the spring catch 10 from bouncing too high.

Embodiment 2

As shown in FIGS. 6 to 7 , this embodiment provides a syringe needle protection device. The difference from the first embodiment is that the locking device includes a blocking block 15 , and the blocking block 15 is fixedly arranged on the outer side wall of the needle protective sleeve 2 . The side wall of the sliding connection sleeve 3 is provided with a vertical groove 16 and an upper transverse groove 17 and a lower transverse groove 18 which are respectively connected with the upper and lower ends of the vertical groove 16. When the needle head extends out of the needle head inlet and outlet 4, the clamping block 15 is clamped on. In the upper transverse groove 17, the needle protective sleeve 2 and the sliding connection sleeve 3 are locked; when the needle is located in the needle protective sleeve 2, the clamping block 15 is clamped in the lower transverse groove 18, and the needle protective sleeve 2 and the sliding connection sleeve 3 are locked , to prevent the needle protective sleeve 2 and the sliding connection sleeve 3 from sliding axially relative to each other, wherein, the outer side wall of the needle protective sleeve 2 is provided with a screw hole, and the snap 15 thread is fastened in the screw hole, the structure is simple and the operation is convenient.

In this embodiment, a limit block is fixed on the inner wall of the needle protective sleeve 2 , and the limit block is located above the spring block 10 . When the spring block 10 bounces up, the limit block can block the spring block 10 . Limit, the limit block is separately arranged on the inner wall of the protective sleeve 2, and the spring block 10 is limited by the limit block to prevent the spring block 10 from bouncing too high.

In the present invention, specific examples are used to illustrate the principles and implementations of the present invention, and the descriptions of the above embodiments are only used to help understand the method and the core idea of the present invention; The idea of the invention will have changes in the specific implementation manner and application range. In conclusion, the contents of this specification should not be construed as limiting the present invention.

Claims (10)

1. A syringe needle protection device is characterized in that: comprising a syringe fixing sleeve, a needle protecting sleeve and a locking device, the syringe fixing sleeve comprises a sliding connecting sleeve and a supporting and fixing part, and one end of the sliding connecting sleeve is connected with the described The supporting and fixing part is fixedly connected, the other end of the sliding connection sleeve is sleeved on one end of the needle protective sleeve and is slidably connected with the needle protective sleeve, the other end of the needle protective sleeve is provided with a needle inlet and outlet, and the needle protective sleeve is The end with the needle inlet and outlet is fixed with an elastic support seat, the end of the syringe with the needle passes through the sliding connecting sleeve and extends into the needle protective sleeve, and the supporting and fixing part is used for supporting and fixing Syringe, the needle protection sleeve is used to protect the needle, and pushing the needle sleeve fixing sleeve can make the needle cylinder squeeze the elastic support seat and make the needle protrude from the needle inlet and outlet. When exiting, the locking device can lock the needle protection sleeve and the sliding connection sleeve. After unlocking the locking device, the needle can be bounced back to the needle protection under the rebounding action of the elastic support seat. inside the set. 2 . The syringe needle protection device according to claim 1 , wherein the support and fixing part comprises a lateral support plate, a vertical support plate and a paddle, and the lateral support plate is perpendicular to the axis of the sliding connection sleeve. 3 . One end of the lateral support plate is fixedly connected to the outer peripheral surface of the sliding connection sleeve, the other end of the lateral support plate is fixedly connected to the vertical support plate, and the vertical support plate is perpendicular to the lateral support plate , the paddle is rotatably connected to the upper surface of the vertical support plate, the lateral support plate is used to support the tail wing at the rear end of the needle cylinder, and rotating the paddle can clamp and fix the tail wing on the lateral support plate and the rear wing. between the picks. 3 . The syringe needle protection device according to claim 1 , wherein the elastic support seat comprises a telescopic tube, a spring blocking piece and a return spring, and the bottom end of the telescopic tube is fixedly connected in the needle protective sleeve and The telescopic tube is communicated with the inlet and outlet of the needle head, and the spring blocking piece is fixedly connected to the outer peripheral surface of the top end of the telescopic tube. Outside the telescopic tube, the spring blocking plate blocks the return spring in the axial direction. 4 . The syringe needle protection device according to claim 1 , wherein the locking device comprises a first elastic protrusion, the first elastic protrusion is fixedly arranged on the side wall of the needle protection sleeve, and the A locking hole is provided on the side wall of the sliding connection sleeve. When the needle extends out of the needle inlet and outlet, the first elastic protrusion is clamped in the locking hole to lock the needle protective sleeve and the sliding connection sleeve. . 5 . The syringe needle protection device according to claim 4 , wherein the locking device further comprises a second elastic protrusion, and the second elastic protrusion is fixedly arranged on the side wall of the needle protection sleeve and located at the side wall of the needle protection sleeve. 6 . Just above the first elastic protrusion, when the needle is located in the needle protective sleeve, the second elastic protrusion is clamped in the locking hole to lock the needle protective sleeve and the sliding connection sleeve. 6 . The syringe needle protection device according to claim 1 , wherein the locking device comprises a blocking block, and the blocking block is fixedly arranged on the outer side wall of the needle protective sleeve, and the sliding connection sleeve is on the side wall. 7 . A vertical groove, an upper transverse groove and a lower transverse groove respectively connected with the upper and lower ends of the vertical groove are provided. When the needle head extends out of the needle head inlet and outlet, the clamping block is clamped in the upper transverse groove. Lock the needle protective sleeve and the sliding connection sleeve; when the needle is located in the needle protective sleeve, the clamping block is clamped in the lower transverse groove, and the needle protective sleeve and the sliding connection sleeve are locked. locking. 7 . The syringe needle protection device according to claim 4 , wherein the first elastic protrusion comprises a first fixed blocking piece, a first movable snap protrusion, a first limit plate and a first spring, 7 . The first fixed blocking piece is fixedly arranged on the inner side wall of the needle protective cover, the side wall of the needle protective cover is provided with a first sliding hole at a position corresponding to the first fixed blocking piece, and one end of the first movable clip is convex. Through the first sliding hole, it protrudes to the outside of the needle protection sleeve. In the first sliding hole, one end of the first spring is fixedly connected to the first fixed blocking piece, and the other end of the first spring extends into the first movable locking protrusion. 8 . The syringe needle protection device according to claim 5 , wherein the second elastic protrusion comprises a second fixed blocking piece, a second movable clamping protrusion, a second limit plate and a second spring, 8 . The second fixed blocking piece is fixedly arranged on the inner side wall of the needle protective cover, the side wall of the needle protective cover is provided with a second sliding hole at a position corresponding to the second fixed blocking piece, and one end of the second movable clip is convex. Through the second sliding hole, it protrudes to the outside of the needle protective sleeve, and the second limit plate is fixed at the other end of the second movable clip, and the second limit plate cannot pass through the In the second sliding hole, one end of the second spring is fixedly connected to the second fixed blocking piece, and the other end of the second spring extends into the second movable locking protrusion. 9 . The syringe needle protection device according to claim 3 , wherein the spring blocking piece comprises a funnel-shaped blocking piece and an annular blocking piece, and the upper edge of the funnel-shaped blocking piece is fixedly connected with the inner ring of the annular blocking piece. 10 . The lower side of the funnel-shaped blocking piece is fixedly connected to the outer peripheral surface of the top end of the telescopic tube, and the funnel-shaped blocking piece is used to support the end of the syringe that is connected with the needle. 10 . The syringe needle protection device according to claim 3 , wherein a limit stop is fixed on the inner wall of the needle protection sleeve, and the limit stop is located above the spring stop. 10 . When the sheet bounces up, the limiting block can limit the spring block.

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