CN113769206B - Fixing device for safety back-cover syringe needle cap and using method thereof - Google Patents

Abstract

The invention discloses a fixing device of a safety back-cover syringe needle cap and a using method thereof, the fixing device comprises a body and a base, the body comprises a shell, a plurality of chucks, a locking assembly and a reset assembly, the problems that the needle cap is difficult to be taken out by one hand, a needle point is easy to contact with an area except the inner surface of the needle cap, the pollution and the rolling are caused, even medical staff operating the syringe are possibly stabbed and the like are solved, the needle cap is convenient for the medical staff to take out the needle cap by one hand, and the fixing device is also suitable for the needle caps with different sizes.

Description

Fixing device for safety back-cover syringe needle cap and using method thereof

Technical Field

The invention relates to the technical field of medical instruments, in particular to a fixing device for a needle cap of an injector.

Background

The syringe needle cap is a detachable protective sleeve used for protecting the syringe needle on the syringe, and the syringe needle cap fixing device is a device used for fixing the needle cap and facilitating the taking off and the sleeving back of the syringe from the syringe.

The size of the prior common syringe needle used clinically is longer, so that medical staff basically operates with one hand when in use, the syringe is held with one hand, and the needle cap is pinched by a thumb and a forefinger to be pushed towards the direction of the needle point; if the needle cap is horizontally laid, the opening is tightly attached to the operating table board, the needle cap is easy to roll, and when the needle cap is sleeved back by a single hand, the needle point is easy to contact the inner surface of the needle cap to cause pollution, even medical staff for operating the syringe can be punctured.

Under the circumstances, a syringe needle cap fixing device is needed to assist medical staff using a syringe to operate with one hand, the sizes of the syringes used in hospitals, health hospitals, clinics and the like are different at present, and the sizes of the syringe needles are also different, however, the used syringe needle cap fixing device disclosed in the patent No. CN209347813U comprises a fixing frame and a C-shaped bayonet arranged on the fixing frame, an annular groove is arranged in the middle of the inner side of the C-shaped bayonet, the inner diameter of the C-shaped bayonet is the same as the outer diameter of the middle upper part of the syringe needle cap, the opening of the C-shaped bayonet is larger than the outer diameter of a syringe needle handle, and the inner diameter of the annular groove is the same as the outer diameter of a circle of boss at the opening of the syringe needle cap. The needle caps with different sizes and types cannot be fixed by one set of syringe needle cap fixing device, so that a device which assists medical staff in operating the sleeve needle cap by one hand and is suitable for the needle caps with different sizes is designed necessarily.

Disclosure of Invention

The invention aims to overcome the defects of the prior art, provides a fixing device for a needle cap of a safety back-sleeving syringe, solves the problems that the needle cap is difficult to take out by one hand, the needle point is easy to contact with the region except the inner surface of the needle cap, the needle cap is polluted and easy to roll, even medical staff operating the syringe are possibly stabbed, and the like, is convenient for the medical staff to take out the needle cap by one hand, and is also suitable for the needle caps with different sizes.

The purpose of the invention is realized by the following technical scheme:

a fixing device for a needle cap of a safety back-sleeved syringe comprises a body and a base, wherein the body comprises a shell, a plurality of chucks, a locking assembly and a resetting assembly;

the shell comprises a first shell, a second shell and a third shell, an opening is formed in the center of the first shell, the edge of the opening is abutted to the middle of the chuck, a boss is arranged on the inner wall of the second shell, and first sliding grooves which are arranged along the radial direction are formed in the lower surface of the boss and the upper surface of the third shell;

the locking assembly comprises a first elastic piece, a movable locking plate, a first guide cylinder vertically arranged on the third shell, a first guide rod, a second elastic piece and a pressure-bearing bottom plate, the first guide rod, the second elastic piece and the pressure-bearing bottom plate are arranged in the first guide cylinder, the movable locking plate is vertically arranged between the boss and the third shell, a plurality of steps are arranged on the inner side of the movable locking plate, each step comprises a guide part arranged in an inward inclined mode and a first limiting part horizontally arranged, first sliding blocks matched with the first sliding grooves are arranged at the upper end and the lower end of the movable locking plate, the first elastic piece is arranged between the second shell and the movable locking plate, the second elastic piece is connected between the third shell and the first guide rod, the upper end of the first guide rod is fixedly connected with the pressure-bearing bottom plate, the thickness of the pressure-bearing bottom plate is smaller than the distance between every two adjacent steps, and the end face of the pressure-bearing bottom plate is abutted to the steps;

the reset assembly comprises an extrusion ring, a connecting rod, a second guide cylinder, a second guide rod, a third elastic piece and a reset button, the extrusion ring is sleeved outside the chuck and is not contacted with the chuck all the time, the outer edge of the extrusion ring is abutted against the guide part of the uppermost step, the connecting rod is fixedly connected between the second guide rod and the extrusion ring, the stroke of the extrusion ring in the vertical direction is smaller than the vertical height of the guide part of the uppermost step, the second guide cylinder is sleeved outside the second guide rod and is fixed on the inner wall of the second shell, the third elastic piece is arranged between the boss and the connecting rod, and the second guide rod extends out of the first shell and is fixedly connected with the reset button;

the lower ends of the clamping heads are hinged to the pressure-bearing bottom plate, clamping spaces are formed on the inner sides of the clamping heads, and needle caps to be fixed are arranged in the clamping spaces.

By adopting the technical scheme, the problems that the needle cap is difficult to take and the needle point is easy to contact with the region except the inner surface of the needle cap by one hand to cause pollution and rolling, even medical staff who operate the syringe are possibly stabbed and the like are solved, and the operation of taking the needle cap by one hand of the medical staff is facilitated.

Preferably, the diameter of the bottom of the clamping space is the same as the outer diameter of the bottom of the needle cap of the maximum size to be fixed.

By adopting the technical scheme, the needle cap to be fixed with any size can be fixed by the device.

Preferably, the pressure-bearing bottom plate is provided with second sliding grooves, the number of the second sliding grooves is the same as that of the chucks, second sliding blocks hinged with the lower ends of the chucks are arranged in the second sliding grooves, and fourth elastic pieces for connecting the second sliding blocks and the inner walls of the second sliding grooves are horizontally arranged in the second sliding grooves.

By adopting the technical scheme, the lower end of the chuck can move to the corresponding position according to the size of the bottom of the needle cap, so that the inner wall of the chuck can be in contact with the needle cap more fully.

Preferably, the upper end part of the clamping head is provided with a clamping lug.

By adopting the technical scheme, the clamping lugs play a role in further limiting the needle cap arranged in the clamping space.

Preferably, the lower end of the first guide rod is provided with a second limiting part, and the second limiting part is connected with the second elastic part.

By adopting the technical scheme, the first guide rod is better limited from being drawn out of the first guide cylinder.

Preferably, the locking assembly comprises two of said movable locking plates.

By adopting the technical scheme, in the process of pressing the pressure-bearing bottom plate downwards through the needle cap, the stress at the two ends of the pressure-bearing bottom plate is equal, so that the device has more reliable performance.

Preferably, the reset assembly comprises at least two second guide rods, a second guide cylinder, a connecting rod and a third elastic member.

The device is only provided with one reset button, so that the process of operating the extrusion ring to extrude the movable locking plate downwards is single-side driving.

Preferably, the body is connected with the base through a universal connecting seat with damping.

By adopting the technical scheme, the angle of the body can be adjusted according to the requirement when the device is used.

The use method of the fixing device for the needle cap of the safety back-cover syringe comprises the following steps:

s1, taking a cap: aligning an injector with the needle cap to a clamping space, so that the needle cap is arranged in the clamping space, the top of the needle cap is continuously pressed down when contacting the pressure-bearing bottom plate, in the process of pressing down, the downward movement of the pressure-bearing bottom plate is converted into the outward horizontal movement of the movable locking plate through the guide part, in the process, the chuck hinged with the pressure-bearing bottom plate at the bottom end is limited by the first shell, the inclination angle of the chuck is changed, so that all the chucks form a closing trend, when the pressure-bearing bottom plate is pressed down below the horizontal line of the first limiting part, the movable locking plate can rebound to an initial position through the first elastic piece, meanwhile, the pressure-bearing bottom plate is clamped by the first limiting part and cannot move upwards, so that the position of the chuck is fixed to avoid the opening of the chuck, the chuck is continuously closed in the process of continuously pressing down the pressure-bearing bottom plate until the downward pressing cannot be continuously performed, at the time, the needle cap is clamped by the chuck, the injector is taken out, and the needle cap is left in the clamping space between the chucks, so as to realize the operation of taking the needle cap;

s2, looping back: the needle point of the syringe faces the inside of the needle cap, the syringe is continuously pressed down until the needle cap is clamped with the syringe needle through the inherent structures of the needle cap and the syringe needle, the reset button is pressed, the extrusion ring vertically moves downwards and extrudes the guide part through the connecting rod and the second guide cylinder, the guide part abutted with the extrusion ring converts the vertical downward movement of the extrusion ring into the horizontal movement of the movable locking plate which is separated outwards until the first limiting part is completely separated from the pressure-bearing bottom plate, the pressure-bearing bottom plate moves upwards to the initial position through the second elastic piece, correspondingly, the chuck resets, the needle cap is loosened, the needle cap is sleeved back, and the syringe is pulled out at the moment.

By adopting the operation method, the operation process of taking down the needle cap and sleeving back the needle cap by the injector is simplified, and the effect that the operation method is simple and easy to understand is achieved.

The invention comprises the following steps:

the injector and the needle cap to be taken down downwards press the pressure-bearing bottom plate, in the process of pressing down, the downward movement of the pressure-bearing bottom plate is converted into the outward horizontal movement of the movable locking plate through the guide part, in the process, the inclined angle of the chuck hinged with the pressure-bearing bottom plate at the bottom end is changed through the limiting action of the first shell, so that all the chucks form a closing trend, when the pressure-bearing bottom plate is continuously pressed down to be below the horizontal line of the first limiting part, the movable locking plate rebounds to an initial position through the first elastic part, at the moment, the pressure-bearing bottom plate is clamped by the limiting part and cannot move upwards, the position of the chuck is fixed, the chuck is prevented from being continuously folded in the process of continuously pressing down the pressure-bearing bottom plate, until the needle cap is clamped by the chuck, the pressure-bearing bottom plate is clamped below the first limiting part of a certain step, the injector is pulled out, and the needle cap is left in a clamping space between the chucks, so that the operation of taking the needle cap is realized;

when the needle cap is sleeved back by the syringe, the needle point of the syringe faces the inside of the needle cap, the syringe is continuously pressed down until the needle cap and the syringe needle are clamped through the inherent structures of the needle cap and the syringe needle, the reset button is pressed, the extrusion ring can vertically move downwards together through the connecting rod and the second guide cylinder, the guide part abutted with the extrusion ring can convert the vertical downward movement of the extrusion ring into the horizontal movement of the locking plate which can be movably separated outwards until the first limiting part is finally separated from the pressure-bearing bottom plate completely, the pressure-bearing bottom plate moves upwards to the initial position through the second elastic piece, correspondingly, the situation that the needle cap is loosened by the chuck is also realized, and the needle cap is sleeved back.

At least one of the following advantageous technical effects can be obtained:

1) The problems that the needle cap is difficult to take and the needle point is easy to contact with the area outside the inner surface of the needle cap by one hand, so that the needle cap is polluted and easy to roll, and even medical workers operating the syringe are possibly stabbed are solved, and the operation of the medical workers for returning the needle cap by one hand is facilitated.

2) The fixing device realizes that the same device can fix needle caps with different sizes.

3) The effects of simple and convenient operation and stable and reliable device performance are achieved.

4) The direction adjustable connection between the device body and the base further improves the practicability of the device.

Drawings

FIG. 1 is a schematic cross-sectional view of the present invention;

FIG. 2 is a partially enlarged view of the step structure of the present invention;

FIG. 3 is a partially enlarged schematic view of a pressure-bearing base plate according to the present invention;

FIG. 4 is a schematic view of the needle cap in the initial state of the device of the present invention;

FIG. 5 is a schematic view of a needle cap in a secured state in the device of the present invention;

fig. 6 is a schematic view showing a state where the reset button is pressed after the needle cap is fixed.

In the figure, 1, a housing; 11. a first housing; 12. a second housing; 13. a third housing; 141. a first chute; 2. a locking assembly; 21. a first elastic member; 22. a movable locking plate; 221. a first slider; 23. a step; 231. a guide portion; 232. a first limiting part; 24. a first guide cylinder; 25. a first guide bar; 251. a second limiting part; 26. a second elastic member; 27. a pressure-bearing bottom plate; 271. a second chute; 272. a fourth elastic member; 3. a reset assembly; 31. a squeezing ring; 32. a connecting rod; 33. A second guide cylinder; 34. a second guide bar; 35. a third elastic member; 36. a reset button; 4. a chuck; 401. a second slider; 402. clamping the lug; 5. a base; 6. a needle cap.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without inventive effort based on the embodiments of the present invention, are within the scope of the present invention.

Referring to fig. 1 to 6, the present invention provides a technical solution:

a fixing device for a needle cap of a safety back-sleeving syringe comprises a body and abase 5, wherein the body comprises ashell 1, a plurality ofchucks 4, a lockingassembly 2 and a resetting assembly 3;

theshell 1 comprises afirst shell 11, asecond shell 12 and athird shell 13, wherein an opening is formed in the center of thefirst shell 11, the edge of the opening abuts against the middle part of thechuck 4, a boss is arranged on the inner wall of thesecond shell 12, and first slidinggrooves 141 which are arranged along the radial direction are formed in the lower surface of the boss and the upper surface of thethird shell 13;

the lockingassembly 2 comprises a firstelastic piece 21, amovable locking plate 22, afirst guide cylinder 24 vertically arranged on thethird shell 13, afirst guide rod 25 arranged in thefirst guide cylinder 24, a secondelastic piece 26 and a pressure-bearingbottom plate 27, wherein themovable locking plate 22 is vertically arranged between the boss and thethird shell 13, a plurality ofsteps 23 are arranged on the inner side of themovable locking plate 22, thesteps 23 comprise aguide part 231 arranged in an inward inclined manner and afirst limit part 232 horizontally arranged, the upper end and the lower end of themovable locking plate 22 are respectively provided with a first slidingblock 221 matched with the first slidinggroove 141, the firstelastic piece 21 is arranged between thesecond shell 12 and themovable locking plate 22, the secondelastic piece 26 is connected between thethird shell 13 and thefirst guide rod 25, the upper end of thefirst guide rod 25 is fixedly connected with the pressure-bearingbottom plate 27, the thickness of the pressure-bearingbottom plate 27 is smaller than the distance between twoadjacent steps 23, and the end surface of the pressure-bearingbottom plate 27 is abutted against thestep 23;

the reset assembly 3 includes apressing ring 31, a connectingrod 32, a second guiding cylinder 33, asecond guiding rod 34, a thirdelastic member 35 and areset button 36, thepressing ring 31 is sleeved outside thechuck 4 and is not contacted therewith all the time, the outer edge of thepressing ring 31 abuts against the guidingportion 231 of theuppermost step 23, the connectingrod 32 is fixed between thesecond guiding rod 34 and thepressing ring 31, the vertical stroke of thepressing ring 31 is smaller than the vertical height of the guidingportion 231 of theuppermost step 23, the second guiding cylinder 33 is sleeved outside thesecond guiding rod 34 and is fixed on the inner wall of thesecond housing 12, the thirdelastic member 35 is arranged between the boss and the connectingrod 32, and thesecond guiding rod 34 extends out of thefirst housing 11 and is fixedly connected with thereset button 36;

the lower ends of thechucks 4 are hinged on the pressure-bearingbottom plate 27, a plurality of clamping spaces are formed on the inner sides of thechucks 4, andneedle caps 6 to be fixed are arranged in the clamping spaces.

Further, the diameter of the bottom of the clamping space is the same as the outer diameter of the bottom of theneedle cap 6 of the maximum size to be fixed.

Further, the pressure-bearingbottom plate 27 is provided with second slidinggrooves 271 with the number consistent with that of thechucks 4, second slidingblocks 401 hinged to the lower ends of thechucks 4 are arranged in the second slidinggrooves 271, and fourthelastic members 272 for connecting the second slidingblocks 401 with the inner walls of the second slidinggrooves 271 are horizontally arranged in the second slidinggrooves 271.

Further, the upper end of thechuck 4 is provided with a clampinglug 402.

Further, a second limiting portion 251 is disposed at a lower end of thefirst guide rod 25, and the second limiting portion 251 is connected to the secondelastic member 26.

Further, the lockingassembly 2 comprises twomovable locking plates 22.

Further, the reset assembly 3 includes twosecond guide rods 34, a second guide cylinder 33, a connectingrod 32 and a thirdelastic member 35.

Further, the body is connected with thebase 5 through a universal connecting seat with damping.

A use method of a fixing device of a needle cap of a safety back-sleeve syringe comprises the following steps:

s1, taking a cap: aligning the syringe with the needle cap 6 to a clamping space, so that the needle cap 6 is placed in the clamping space, and the top of the needle cap 6 is continuously pressed down when contacting the pressure-bearing bottom plate 27, in the process of pressing down, the downward movement of the pressure-bearing bottom plate 27 is converted into the outward horizontal movement of the movable locking plate 22 through the guide part 231, in the process, the chuck 4 hinged with the pressure-bearing bottom plate 27 at the bottom end is limited by the first housing 11, the inclination angle of the chuck 4 is changed, so that all the chucks 4 form a tendency of folding, when the pressure-bearing bottom plate 27 is pressed down below the horizontal line of the first limiting part 232, the movable 22 can rebound to an initial position through the first elastic part 21, and meanwhile, the pressure-bearing bottom plate 27 is clamped by the first limiting part 232 and cannot move upwards, so that the position of the chuck 4 is fixed, the locking plate is avoided, in the process of continuously pressing down the pressure-bearing bottom plate 27, the chuck 4 is continuously folded until the needle cap 6 cannot be pressed down, at this time, the needle cap 6 is clamped by the chuck 4, is pulled out of the syringe, and the needle cap 6 is left in the clamping space, so that the needle cap is taken out, and the needle cap is taken out;

s2, looping back: the needle point of the syringe faces the inside of the needle cap, the syringe is continuously pressed downwards until theneedle cap 6 is clamped with the syringe needle through the inherent structures of the needle cap and the syringe needle, thereset button 36 is pressed, theextrusion ring 31 vertically moves downwards and extrudes theguide part 231 through the connectingrod 32 and the second guide cylinder 33, theguide part 231 abutted with theextrusion ring 31 converts the vertical downward movement of theextrusion ring 31 into the horizontal movement of themovable locking plate 22 which is separated outwards until the first limitingpart 232 is completely separated from the pressure-bearingbottom plate 27, the pressure-bearingbottom plate 27 moves upwards to the initial position through the secondelastic piece 26, correspondingly, thechuck 4 is reset, theneedle cap 6 is loosened, theneedle cap 6 is sleeved, and the syringe is pulled out.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

The foregoing is illustrative of the preferred embodiments of this invention, and it is to be understood that the invention is not limited to the precise form disclosed herein and that various other combinations, modifications, and environments may be resorted to, falling within the scope of the concept as disclosed herein, either as described above or as apparent to those skilled in the relevant art. And that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (6)

1. The utility model provides a fixing device of safe back cover syringe needle cap, includes body and base (5), its characterized in that: the body comprises a shell (1), a plurality of chucks (4), a locking assembly (2) and a resetting assembly (3);

the shell (1) comprises a first shell (11), a second shell (12) and a third shell (13), an opening is formed in the center of the first shell (11), the edge of the opening abuts against the middle of the chuck (4), a boss is arranged on the inner wall of the second shell (12), and first sliding grooves (141) which are radially arranged are formed in the lower surface of the boss and the upper surface of the third shell (13);

the locking assembly (2) comprises a first elastic piece (21), a movable locking plate (22), a first guide cylinder (24) vertically arranged on the third shell (13), a first guide rod (25) arranged in the first guide cylinder (24), a second elastic piece (26) and a pressure-bearing bottom plate (27), the movable locking plate (22) is vertically arranged between the boss and the third shell (13), a plurality of steps (23) are arranged on the inner side of the movable locking plate (22), the steps (23) comprise a guide part (231) which is obliquely arranged inwards and a first limiting part (232) which is horizontally arranged, first sliding blocks (221) matched with the first sliding grooves (141) are arranged at the upper end and the lower end of the movable locking plate (22), the first elastic piece (21) is arranged between the second shell (12) and the movable locking plate (22), the second elastic piece (26) is connected between the third shell (13) and the first guide rod (25), the upper end of the first guide rod (25) is fixedly connected with the pressure-bearing bottom plate (27), the thickness of the pressure-bearing bottom plate (27) is smaller than the distance between the two adjacent pressure-bearing bottom plates (27), and the two pressure-bearing bottom plates (27) are abutted against each other;

the reset assembly (3) comprises a squeezing ring (31), a connecting rod (32), a second guide cylinder (33), a second guide rod (34), a third elastic piece (35) and a reset button (36), wherein the squeezing ring (31) is sleeved outside the chuck (4) and is not contacted with the chuck all the time, the outer edge of the squeezing ring (31) is abutted against the guide part (231) of the uppermost step (23), the connecting rod (32) is fixedly connected between the second guide rod (34) and the squeezing ring (31), the stroke of the squeezing ring (31) in the vertical direction is smaller than the vertical height of the guide part (231) of the uppermost step (23), the second guide cylinder (33) is sleeved outside the second guide rod (34) and is fixed on the inner wall of the second shell (12), the third elastic piece (35) is arranged between the boss and the connecting rod (32), and the second guide rod (34) extends out of the first shell (11) and is fixedly connected with the reset button (36);

the lower ends of the chucks (4) are hinged to the pressure-bearing bottom plate (27), clamping spaces are formed on the inner sides of the chucks (4), and needle caps (6) to be fixed are arranged in the clamping spaces;

second sliding grooves (271) with the same number as the chucks (4) are formed in the pressure-bearing bottom plate (27), second sliding blocks (401) hinged with the lower ends of the chucks (4) are arranged in the second sliding grooves (271), and fourth elastic pieces (272) for connecting the second sliding blocks (401) with the inner walls of the second sliding grooves (271) are horizontally arranged in the second sliding grooves (271);

a second limiting part (251) is arranged at the lower end of the first guide rod (25), and the second limiting part (251) is connected with the second elastic piece (26);

the resetting component (3) comprises at least two second guide rods (34), a second guide cylinder (33), a connecting rod (32) and a third elastic piece (35).

2. The safety back-cover syringe needle cap fixing device of claim 1, wherein: the diameter of the bottom of the clamping space is the same as the outer diameter of the bottom of the needle cap (6) with the maximum size to be fixed.

3. The safety back-cover syringe needle cap fixing device of claim 1, wherein: the upper end part of the chuck (4) is provided with a clamping lug (402).

4. The fixing device of the needle cap of the safety back-sleeve syringe as claimed in claim 1, wherein: the locking assembly (2) comprises two of said movable locking plates (22).

5. The fixing device of the needle cap of the safety back-sleeve syringe as claimed in claim 1, wherein: the body is connected with the base (5) through a universal connecting seat with damping.

6. A method of using the safety back-cover syringe needle cap fixing device according to any one of claims 1 to 5, wherein:

the method comprises the following steps:

s1, taking a cap: aligning the syringe with the needle cap (6) to a clamping space so that the needle cap (6) is placed in the clamping space, and the top of the needle cap (6) is continuously pressed down when contacting the pressure-bearing bottom plate (27), the guide part (231) can convert the downward movement of the pressure-bearing bottom plate (27) into the outward separated horizontal movement of the movable locking plate (22), the clamping head (4) with the bottom end hinged with the pressure-bearing bottom plate (27) is limited by the first shell (11), the inclination angle of the chucks (4) can be changed, so that all the chucks (4) form a closing trend, when the pressure-bearing bottom plate (27) is pressed down to be below the horizontal line of the first limiting part (232), the movable locking plate (22) is rebounded to an original position by the first elastic member (21), meanwhile, the pressure-bearing bottom plate (27) can be clamped by the first limiting part (232) and can not move upwards, therefore, the position of the chuck (4) is fixed to avoid opening, the chuck (4) is continuously folded in the process of continuously pressing down the pressure-bearing bottom plate (27) until the chuck cannot be continuously pressed down, the needle cap (6) is clamped by the chuck (4) at the moment, the injector is pulled out, the needle cap (6) is left in a clamping space between the chucks (4), and the operation of taking the needle cap is realized;

s2, looping back: the needle point of the syringe faces the inside of the needle cap, the syringe is continuously pressed down until the needle cap (6) is clamped with the syringe needle through the inherent structures of the needle cap and the syringe needle, the reset button (36) is pressed, the extrusion ring (31) moves vertically downwards and extrudes the guide part (231), the guide part (231) abutted to the extrusion ring (31) converts the vertical downward movement of the extrusion ring (31) into the horizontal movement of the movable locking plate (22) which separates outwards until the first limiting part (232) is completely separated from the pressure-bearing bottom plate (27), the pressure-bearing bottom plate (27) moves upwards to the initial position through the second elastic piece (26), correspondingly, the chuck (4) resets, the needle cap (6) is loosened, the needle cap (6) is returned, and the syringe is pulled out.

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