CN219251208U - Needle-puncture-preventing venous indwelling needle with wings - Google Patents

Abstract

The utility model belongs to the field of medical appliance supplies, and relates to an anti-needling venous indwelling needle with wings, which comprises a catheter assembly, a spring assembly, a needle seat assembly and an extension tube assembly, wherein the tail part of the catheter assembly is connected with the spring assembly, and one side of the catheter assembly is connected with the extension tube assembly; the needle seat assembly comprises a needle seat and a needle tube, and the tail end of the needle tube is fixed with the needle seat; the catheter assembly comprises a catheter seat, the head end of the catheter seat is fixedly connected with a catheter, a separation plug is arranged in a cavity in the catheter seat, a fixed core is arranged between the separation plug and the tail end of the catheter, the fixed core is communicated with the catheter and a short joint arranged on one side of the catheter seat, and the short joint is connected with the extension tube assembly; the spring plate assembly comprises a spring plate seat, a spring card is arranged in the spring plate seat, and a front end hook body is arranged at the head end of the spring card; the front hook body of the spring card is jacked up by the needle tube and positioned at one side of the needle tube. The high-pressure radiography needle tube is reasonable in structural design, simple to operate and high in safety, can effectively avoid needle tube pricking medical staff, and can be well matched with high-pressure radiography.

Description

Needle-puncture-preventing venous indwelling needle with wings

Technical Field

The utility model relates to an anti-needling venous indwelling needle with wings, and belongs to the field of medical equipment.

Background

In recent years, the application range of the venous indwelling needle is continuously expanded, and the venous indwelling needle is popularized and applied in various clinical departments. The use of the indwelling needle can greatly reduce the infusion and needle insertion times, comprehensively lighten the pain of infusion patients and reduce the working intensity of medical staff, and is acceptable to both doctors and patients. Needle-stick injuries are important professional injuries faced by clinical medical staff, wounds caused by cuts, needle-stick injuries and the like are frequently seen on hands of nurses, and the main harm of the needle-stick injuries is that blood-borne infectious diseases occur, so that the protection of nursing staff on the blood-borne infectious diseases is enhanced.

In addition, the use of high-pressure radiography has been increasing in recent years, and the development of an indwelling needle which is resistant to needle stick and can be used in combination with high-pressure radiography has been a problem to be solved by those skilled in the art, as the mortality rate of the aged population and the tumor and cardiovascular diseases has been increasing.

Disclosure of Invention

The utility model aims to solve the technical problems that: the needle-puncture-preventing venous indwelling needle with the wings is simple to operate, high in safety, capable of effectively preventing needle tubes from puncturing medical staff, and capable of being used in good cooperation with high-pressure radiography.

The utility model relates to a winged anti-needling venous indwelling needle, which comprises a catheter assembly, a spring assembly, a needle seat assembly and an extension tube assembly, wherein the tail part of the catheter assembly is connected with the spring assembly, and one side of the catheter assembly is connected with the extension tube assembly; the needle seat assembly comprises a needle seat and a needle tube, and the tail end of the needle tube is fixed with the needle seat;

the catheter assembly comprises a catheter seat, the head end of the catheter seat is fixedly connected with a catheter, a separation plug is arranged in a cavity in the catheter seat, a fixed core is arranged between the separation plug and the tail end of the catheter, the fixed core is communicated with the catheter and a short joint arranged on one side of the catheter seat, and the short joint is connected with the extension tube assembly; butterfly wings are arranged on two sides of the catheter seat;

the spring plate assembly comprises a spring plate seat, a spring card is arranged in the spring plate seat, the tail end of the spring card is fixed with the tail end of the spring plate seat, the head end of the spring card is provided with a front end hook body, the head end of the needle seat is sleeved on the periphery of the middle rear part of the spring plate seat, the needle tube penetrates through the spring plate assembly and the catheter assembly, and the needle tube penetrates out of the catheter; the front hook body of the spring card is jacked up by the needle tube and positioned at one side of the needle tube.

The isolating plug is an elastic piece and can seal the inner cavity of the catheter seat behind the fixed core; the rear end of the guide tube seat is inserted into the elastic sheet seat, the middle and rear parts of the elastic sheet seat are inserted into the needle seat, and when the needle tube is punctured, the three parts can act uniformly, separation can not occur under the action of no external force, and the puncture can be successfully completed. In the initial state, the front end coupler of the spring card is jacked up by the needle tube and positioned on one side of the needle tube, at the moment, the front end coupler of the spring card tightly presses the needle tube under the action of elastic force, and at the moment, the needle tube penetrates through the isolation plug, the isolation plug tightly wraps the needle tube, the needle tube is sealed, and the consistent action among the catheter seat, the elastic sheet seat and the needle seat is further ensured. The butterfly wings are arranged to facilitate the fixation of the catheter seat to the patient.

When the needle is withdrawn, the needle tube does not have supporting force on the front end hook body when the head of the needle tube retreats to the rear of the front end hook body of the spring card, so that the front end hook body of the spring card falls back under the action of elasticity, at the moment, the needle point of the needle tube is covered and blocked by the front end hook body, and when the needle tube is pulled backwards continuously, the needle tube drives the spring plate seat to be separated from the catheter seat; when the needle tube is withdrawn from the isolation plug, the isolation plug rebounds rapidly, and blood overflow is effectively blocked. When the subsequent transfusion is needed, the liquid medicine enters the fixed core through the extension tube assembly and then enters the catheter, finally enters the patient, and the isolating plug still plays a role in blocking under pressure during high-pressure radiography. After withdrawing the needle, the needle point is covered and blocked by the front end hook body, so that the condition that other people are injured by the needle after the needle is pulled out can be effectively avoided, and the safety is high.

Preferably, the rear end of the inner cavity of the spring plate seat is provided with a spring plate fixing seat, the middle part of the spring plate fixing seat is provided with a through groove, the tail end of the inner cavity of the spring plate seat is plugged by a limiting plate, the middle part of the limiting plate is provided with a through hole, and a fixing groove is formed between the spring plate fixing seat and the limiting plate; the tail part of the spring card is provided with an inverted U-shaped groove, the front end hook body is arranged at the front end of the inverted U-shaped groove, a spring piece front arm is arranged between the front end hook body and the inverted U-shaped groove of the spring card, the rear end of the inverted U-shaped groove is provided with a spring-shaped folding hook, the inverted U-shaped groove is clamped on a spring piece fixing seat, and the spring-shaped folding hook is positioned in the fixing groove; the needle tube penetrates through the through hole, a rear limit hole of the wall of the inverted U-shaped groove on one side of the spring card, the through groove and a front limit hole arranged at the front end of the elastic sheet seat, and the elastic folding hook and the front end hook body are respectively arranged at the opposite side of the needle tube; the front part of the needle tube is provided with an indentation, and the diameter of the indentation part of the needle tube is larger than the diameter of the rear limit hole.

The distance between the needle tube tip and the indentation is matched with the distance between the front end hook body and the rear limit hole; the spring card is in an original non-deformation state when not subjected to the force of the needle tube, at the moment, the front arm of the spring card is flush with the opening of the inverted U-shaped groove, and is in a deformation state when subjected to the jacking force of the needle tube, so that after the needle tube is withdrawn, the front end hook body of the spring card rapidly rebounds to block the needle tip of the needle tube, when the needle tube is continuously withdrawn, the indentation moves to the back limiting hole of the spring card, because the elastic-shaped hook of the spring card is positioned in the fixing groove, the indentation is withdrawn backwards and blocked by the spring card and the limiting plate, and the needle tube is continuously withdrawn to directly drive the elastic sheet seat to be separated from the catheter seat. The spring-shaped folding hook and the front-end hook body are respectively arranged at the opposite sides of the needle tube, so that the front-end hook body of the spring card can rebound rapidly.

Preferably, a fixed hook is additionally arranged on the inner cavity wall of the spring plate seat, the fixed hook is arranged on one side of the spring plate fixing seat close to the front end hook body, and the spring card is clamped below the fixed hook. After the needle tube jacks up the front end hook body to deform the spring card, the fixed hook presses the position of the spring card close to the inverted U-shaped groove, so that the spring card is prevented from being lifted up entirely, the deformation effect is influenced, and the rebound effect is influenced.

Preferably, the top end of the spring plate seat corresponding to the spring card at one side of the front end hook body is hollow; the tail end of the guide tube seat is inserted into the head end of the elastic sheet seat, the tail of the guide tube seat is additionally provided with a hollowed-out groove, and the front end hook body jacked by the needle tube is clamped in the hollowed-out groove. Under the initial condition, the front end hook body is clamped in the hollow groove, the effect of fixing the guide tube seat and the elastic sheet seat is achieved to a certain extent, and when the front end hook body rebounds to leave the rear end groove, the guide tube seat and the elastic sheet seat can be easily separated.

Preferably, a limit slot hole is arranged on the conduit seat between the hollow slot and the isolation plug, a gasket is inserted into the limit slot hole, a needle tube slot is arranged in the middle of the gasket, the needle tube penetrates out of the needle tube slot, and the tail end of the isolation plug is blocked by the gasket. The spacer is arranged to block the isolating plug from moving backwards when the indwelling needle bears larger infusion pressure, so that the device can be better matched with high-pressure radiography.

Preferably, the extension tube assembly comprises an extension tube, the head of the extension tube is communicated and fixed with a short joint, the tail of the extension tube is communicated and fixed with a connecting seat, the connecting seat is respectively communicated with a needleless joint and an exhaust joint, and a flow stopping clamp is arranged on the extension tube between the short joint and the connecting seat. Two ends of the extension tube are respectively fixed with the short joint and the connecting seat through glue; the needleless connector can be directly connected with the outer conical connector of the infusion apparatus without communicating with an infusion needle or an injection needle to form an infusion channel.

Preferably, the penetrating reinforcing ribs are additionally arranged on the front arm of the elastic sheet, so that the strength of the front arm of the elastic sheet is increased, the elastic effect is improved, the front hook body can rebound rapidly, and the needling prevention effect is enhanced.

Preferably, guide posts are arranged on two sides of the middle of the elastic sheet seat, guide grooves are arranged at positions, corresponding to the guide posts, of the inner cavity wall of the needle seat, the guide posts are inserted into the guide grooves, and the guide posts are in sliding fit with the guide grooves. When the needle tube is installed, the guide post is matched with the guide groove, so that the spring plate seat and the needle seat are smooth in installation and matching, the spring plate seat and the needle seat can be prevented from relative rotation in the process of controlling the needle tube to withdraw by holding the needle seat, and the spring card can be well protected; in addition, during puncture, the guide groove pair can apply certain thrust to the spring plate seat through the guide post.

Preferably, the head end of the spring plate seat is provided with a push handle, and the push handle is convenient to push the catheter forwards in the process of operating the needle seat to withdraw the needle; and the push handle is fixed with the elastic sheet seat but not with the catheter seat, so that the later-stage fixation of the catheter seat can be facilitated.

Preferably, the catheter periphery cover be equipped with the sheath, sheath tail end and catheter holder threaded connection are fixed, and the dismouting of sheath is all comparatively convenient.

Compared with the prior art, the utility model has the following beneficial effects:

the needle tube puncture prevention device is reasonable in structural design, simple to operate and high in safety, and can effectively prevent needle tubes from puncturing medical staff; and the spacer is arranged when the indwelling needle bears larger infusion pressure, the isolating plug is prevented from moving backwards, and the device can be well matched with high-pressure radiography.

Drawings

FIG. 1 is a schematic view of a winged anti-puncture venous indwelling needle;

FIG. 2 is a schematic view of a catheter assembly;

FIG. 3 is a schematic view of a spring plate seat;

FIG. 4 is a schematic view of a spring card construction;

FIG. 5 is a schematic view of the engagement of the needle cannula with the spring card (initial state);

FIG. 6 is a schematic view of the engagement of the needle cannula with the spring card (with the needle cannula retracted);

fig. 7 is a schematic view of the structure of the needle holder.

In the figure: 1. a sheath; 2. a catheter assembly; 3. a spring assembly; 4. a hub assembly; 5. an extension tube assembly;

21. a conduit; 22. a fixed core; 23. a catheter holder; 24. butterfly wings; 25. a spacer plug; 26. a gasket; 27. a short joint; 231. limiting slot holes; 232. a hollow groove;

31. a spring card; 311. a front end hook body; 312. a spring plate front arm; 313. spring-shaped folding hooks; 314. penetrating the reinforcing ribs; 315. an inverted U-shaped groove; 316. a rear limit hole;

32. a spring plate seat; 321. pushing hands; 322. a guide post; 323. a front limit hole; 324. a through hole; 325. a fixed hook; 326. a fixing groove; 327. a spring plate fixing seat; 328. a through groove; 329. a limiting plate;

41. a needle tube; 411. indentation; 42. a needle stand; 421. a guide groove;

51. an extension tube; 52. a flow stop clip; 53. a connecting seat; 54. a needleless connector; 55. an exhaust joint.

Detailed Description

The utility model is further described below with reference to the accompanying drawings:

1-7, the winged anti-puncture venous indwelling needle comprises a catheter component 2, a spring piece component 3, a needle seat component 4 and an extension tube component 5, wherein the tail part of the catheter component 2 is connected with the spring piece component 3, and one side of the catheter component 2 is connected with the extension tube component 5; the needle seat assembly 4 comprises a needle seat 42 and a needle tube 41, and the tail end of the needle tube 41 is fixed with the needle seat 42;

the catheter assembly 2 comprises a catheter seat 23, a catheter 21 is fixedly connected to the head end of the catheter seat 23, a separation plug 25 is arranged in a cavity in the catheter seat 23, a fixed core 22 is arranged between the separation plug 25 and the tail end of the catheter 21, the fixed core 22 is communicated with the catheter 21 and a short joint 27 arranged on one side of the catheter seat 23, and the short joint 27 is connected with the extension tube assembly 5; butterfly wings 24 are arranged on two sides of the catheter seat 23;

the spring plate assembly 3 comprises a spring plate seat 32, a spring card 31 is arranged in the spring plate seat 32, the tail end of the spring card 31 is fixed with the tail end of the spring plate seat 32, the head end of the spring card 31 is provided with a front end hook body 311, the head end of a needle seat 42 is sleeved on the periphery of the middle rear part of the spring plate seat 32, a needle tube 41 penetrates through the spring plate assembly 3 and the catheter assembly 2, and the needle tube 41 penetrates out of the catheter 21; the front hook 311 of the spring card 31 is pushed up by the needle tube 41 and is located on the side of the needle tube 41.

In this embodiment:

the rear end of the inner cavity of the spring plate seat 32 is provided with a spring plate fixing seat 327, the middle part of the spring plate fixing seat 327 is provided with a through groove 328, the tail end of the inner cavity of the spring plate seat 32 is blocked by a limiting plate 329, the middle part of the limiting plate 329 is provided with a through hole 324, and a fixing groove 326 is arranged between the spring plate fixing seat 327 and the limiting plate 329; the tail of the spring card 31 is provided with an inverted U-shaped groove 315, a front end hook body 311 is arranged at the front end of the inverted U-shaped groove 315, a spring piece front arm 312 is arranged between the front end hook body 311 and the inverted U-shaped groove 315 of the spring card 31, the rear end of the inverted U-shaped groove 315 is provided with a spring-shaped folding hook 313, the inverted U-shaped groove 315 is clamped on a spring piece fixing seat 327, and the spring-shaped folding hook 313 is positioned in a fixing groove 326; the needle tube 41 penetrates through the through hole 324, a rear limit hole 316 of the groove wall at one side of the inverted U-shaped groove 315 of the spring card 31, a through groove 328 and a front limit hole 323 arranged at the front end of the spring plate seat 32, and the elastic folding hook 313 and the front end hook body 311 are respectively arranged at the opposite side of the needle tube 41; the front part of the needle tube 41 is provided with an indentation 411, and the diameter of the indentation 411 of the needle tube 41 is larger than the diameter of the rear limit hole 316.

The distance between the tip of the needle tube 41 and the indentation 411 is matched with the distance between the front end hook 311 and the rear limit hole 316; when the needle tube 41 is continuously withdrawn, the indentation 411 moves to the back limit hole 316 of the spring card 31, because the elastic folding hook 313 of the spring card 31 is positioned in the fixing groove 326, the indentation 411 is blocked by the spring card 31 and the limit plate 329 when the indentation 411 is withdrawn backwards, and therefore the needle tube 41 continuously withdraws to directly drive the spring plate 32 to separate from the catheter seat 23. The spring hook 313 and the front hook 311 are separately provided on the opposite side of the needle tube 41, which is more advantageous for the front hook 311 of the spring card 31 to rebound rapidly.

The inner cavity wall of the spring plate seat 32 is additionally provided with a fixing hook 325, the fixing hook 325 is arranged on one side of the spring plate fixing seat 327 close to the front end hook body 311, and the spring card 31 is clamped below the fixing hook 325. After the front end hook body 311 is jacked up by the needle tube 41 to deform the spring card 31, the fixing hook 325 presses the position of the spring card 31 close to the inverted U-shaped groove 315, so that the spring card 31 is prevented from being lifted up completely, the deformation effect is influenced, and the rebound effect is further influenced.

The top end of the spring plate seat 32 corresponding to the spring card 31 at one side of the front end hook 311 is hollow; the tail end of the guide tube seat 23 is inserted into the head end of the spring plate seat 32, the tail end of the guide tube seat 23 is additionally provided with a hollowed-out groove 232, and a front end hook 311 jacked by the needle tube 41 is clamped in the hollowed-out groove 232. In the initial state, the front end hook 311 is clamped in the hollow groove 232, so that the effect of fixing the guide tube seat 23 and the elastic sheet seat 32 is achieved to a certain extent, and when the front end hook 311 rebounds away from the rear end groove, the guide tube seat 23 and the elastic sheet seat 32 can be easily separated.

The catheter seat 23 between the hollow groove 232 and the isolation plug 25 is provided with a limit groove hole 231, a gasket 26 is inserted into the limit groove hole 231, a needle tube 41 groove is arranged in the middle of the gasket 26, the needle tube 41 penetrates out of the needle tube 41 groove, and the tail end of the isolation plug 25 is blocked by the gasket 26. The spacer 26 is arranged to prevent the isolating plug 25 from moving backwards when the indwelling needle bears larger infusion pressure, so that the device can be better matched with high-pressure radiography.

The extension tube assembly 5 comprises an extension tube 51, the head of the extension tube 51 is fixedly communicated with a short joint 27, the tail of the extension tube 51 is fixedly communicated with a connecting seat 53, the connecting seat 53 is respectively communicated with a needle-free joint 54 and an exhaust joint 55, and a flow stopping clamp 52 is arranged on the extension tube 51 between the short joint 27 and the connecting seat 53. Two ends of the extension tube 51 are respectively fixed with the short joint 27 and the connecting seat 53 through glue adhesion; the needleless connector 54 can be directly connected to the outer conical connector of the infusion set without requiring an infusion needle or injection needle to communicate to form an infusion path.

The penetrating reinforcing rib 314 is additionally arranged on the elastic piece front arm 312, so that the strength of the elastic piece front arm 312 is increased, the elastic effect is improved, the front end hook 311 is facilitated to rebound rapidly, and the needling prevention effect is enhanced.

Guide posts 322 are arranged on two sides of the middle of the spring plate seat 32, guide grooves 421 are arranged on the inner cavity wall of the needle seat 42 at positions corresponding to the guide posts 322, the guide posts 322 are inserted into the guide grooves 421, and the guide posts 322 are in sliding fit with the guide grooves 421. During installation, the guide post 322 is matched with the guide groove 421, so that the elastic sheet seat 32 and the needle seat 42 are smooth during installation and matching, and the relative rotation between the elastic sheet seat 32 and the needle seat 42 can be prevented in the process of controlling the needle tube 41 to withdraw by the hand-held needle seat 42, and the spring card 31 can be well protected; in addition, during puncturing, the pair of guide grooves 421 can apply a certain pushing force to the spring plate seat 32 through the guide post 322.

The head end of the spring plate seat 32 is provided with a push handle 321, and the push handle 321 is arranged to facilitate the forward pushing of the catheter 21 in the process of operating the needle seat 42 to withdraw the needle; and the push handle 321 is fixed with the elastic sheet seat 32 but not with the catheter seat 23, so that the later fixation of the catheter seat 23 can be facilitated. The periphery of the catheter 21 is sleeved with the sheath 1, the tail end of the sheath 1 is fixedly connected with the catheter seat 23 through threads, and the sheath 1 is convenient to assemble and disassemble.

The isolating plug 25 is an elastic piece and can seal the inner cavity of the catheter seat 23 behind the fixed core 22; the rear end of the catheter seat 23 is inserted into the spring plate seat 32, the middle and rear parts of the spring plate seat 32 are inserted into the needle seat 42, and when the needle tube 41 is punctured, the three parts can move uniformly, separation can not occur under the action of no external force, and the puncture can be successfully completed. In the initial state, the front end hook 311 of the spring card 31 is jacked up by the needle tube 41 to be located at one side of the needle tube 41, at this time, the front end hook 311 of the spring card 31 presses the needle tube 41 under the action of elastic force, and at this time, the needle tube 41 penetrates through the isolation plug 25, the isolation plug 25 wraps the needle tube 41, the needle tube 41 is sealed, and the consistent actions among the catheter holder 23, the elastic sheet holder 32 and the needle holder 42 are further ensured. The butterfly wings 24 are provided to facilitate fixation of the catheter hub 23 to the patient.

When the needle holder 42 is held by hand, the needle holder 42 is pushed, the needle holder 42 pushes the spring sheet seat 32, the spring sheet seat 32 pushes the catheter seat 23, the needle tube 41 is ensured to successfully complete puncture, and the catheter 21 completes puncture together with the needle tube 41, then the needle is withdrawn, in the process of withdrawing the needle tube 41, when the head of the needle tube 41 retreats to the rear of the front end hook 311 of the spring card 31, the needle tube 41 does not have supporting force on the front end hook 311 any more, so that the front end hook 311 of the spring card 31 falls back under the action of elasticity, at the moment, the needle point of the needle tube 41 is blocked by the front end hook 311, and when the needle tube 41 is continuously pulled backwards, the needle tube 41 drives the spring sheet seat 32 to be separated from the catheter seat 23; when needle cannula 41 is withdrawn from septum 25, septum 25 springs back rapidly, effectively blocking blood overflow. When infusion is subsequently required, the medical fluid enters the stationary core 22 through the extension tube assembly 5, then into the catheter 21, and finally into the patient. After withdrawing the needle, the needle tip is blocked by the front end hook 311, so that the condition that other people are injured by the needle after the needle is pulled out can be effectively avoided, and the safety is high.

Claims (10)

1. An anti-needling venous indwelling needle with wings, which is characterized in that: the needle seat comprises a catheter assembly (2), a spring plate assembly (3), a needle seat assembly (4) and an extension tube assembly (5), wherein the tail part of the catheter assembly (2) is connected with the spring plate assembly (3), and one side of the catheter assembly (2) is connected with the extension tube assembly (5); the needle seat assembly (4) comprises a needle seat (42) and a needle tube (41), and the tail end of the needle tube (41) is fixed with the needle seat (42);

the catheter assembly (2) comprises a catheter seat (23), a catheter (21) is fixedly connected to the head end of the catheter seat (23), a separation plug (25) is arranged in an inner cavity of the catheter seat (23), a fixed core (22) is arranged between the separation plug (25) and the tail end of the catheter (21), the fixed core (22) is communicated with the catheter (21) and a short joint (27) arranged on one side of the catheter seat (23), and the short joint (27) is connected with the extension tube assembly (5); butterfly wings (24) are arranged on two sides of the catheter seat (23);

the spring plate assembly (3) comprises a spring plate seat (32), a spring card (31) is arranged in the spring plate seat (32), the tail end of the spring card (31) is fixed with the tail end of the spring plate seat (32), the head end of the spring card (31) is provided with a front end hook body (311), the head end of a needle seat (42) is sleeved on the periphery of the middle rear part of the spring plate seat (32), a needle tube (41) penetrates through the spring plate assembly (3) and the catheter assembly (2), and the needle tube (41) penetrates out of the catheter (21); the front hook body (311) of the spring card (31) is jacked up by the needle tube (41) and positioned at one side of the needle tube (41).

2. The winged anti-needle-stick intravenous catheter of claim 1, wherein: the rear end of the inner cavity of the spring plate seat (32) is provided with a spring plate fixing seat (327), the middle part of the spring plate fixing seat (327) is provided with a through groove (328), the tail end of the inner cavity of the spring plate seat (32) is blocked by a limiting plate (329), the middle part of the limiting plate (329) is provided with a through hole (324), and a fixing groove (326) is arranged between the spring plate fixing seat (327) and the limiting plate (329); the tail of the spring card (31) is provided with an inverted U-shaped groove (315), a front end hook body (311) is arranged at the front end of the inverted U-shaped groove (315), a spring piece front arm (312) is arranged between the front end hook body (311) and the inverted U-shaped groove (315) of the spring card (31), the rear end of the inverted U-shaped groove (315) is provided with a spring-shaped folding hook (313), the inverted U-shaped groove (315) is clamped on a spring piece fixing seat (327), and the spring-shaped folding hook (313) is positioned in a fixing groove (326); the needle tube (41) penetrates through the through hole (324), a rear limit hole (316) of the groove wall at one side of the inverted U-shaped groove (315) of the spring card (31), a penetrating groove (328) and a front limit hole (323) arranged at the front end of the spring plate seat (32), and the elastic folding hook (313) and the front end hook body (311) are respectively arranged at the opposite side of the needle tube (41); the front part of the needle tube (41) is provided with an indentation (411), and the diameter of the indentation (411) of the needle tube (41) is larger than the diameter of the rear limit hole (316).

3. The winged anti-needle-stick intravenous catheter of claim 2, wherein: the fixed hook (325) is additionally arranged on the inner cavity wall of the spring plate seat (32), the fixed hook (325) is arranged on one side of the spring plate fixing seat (327) close to the front end hook body (311), and the spring card (31) is clamped below the fixed hook (325).

4. The winged anti-needle-stick intravenous catheter of claim 1, wherein: the top end of the spring plate seat (32) corresponding to the spring card (31) at one side of the front end hook body (311) is hollowed out; the tail end of the guide tube seat (23) is inserted into the head end of the spring plate seat (32), the tail of the guide tube seat (23) is additionally provided with a hollowed-out groove (232), and the front end hook body (311) jacked by the needle tube (41) is clamped in the hollowed-out groove (232).

5. The winged anti-needle-stick intravenous catheter of claim 4, wherein: the catheter seat (23) between the hollow groove (232) and the isolation plug (25) is provided with a limit groove hole (231), a gasket (26) is inserted into the limit groove hole (231), a needle tube (41) groove is formed in the middle of the gasket (26), the needle tube (41) penetrates out of the needle tube (41) groove, and the tail end of the isolation plug (25) is blocked by the gasket (26).

6. The winged anti-needle-stick intravenous catheter of claim 1, wherein: the extension tube assembly (5) comprises an extension tube (51), the head of the extension tube (51) is fixedly communicated with a short joint (27), the tail of the extension tube (51) is fixedly communicated with a connecting seat (53), the connecting seat (53) is respectively communicated with a needle-free joint (54) and an exhaust joint (55), and a flow stopping clamp (52) is arranged on the extension tube (51) between the short joint (27) and the connecting seat (53).

7. The winged anti-needle-stick intravenous catheter of claim 2, wherein: the front arm (312) of the spring plate is additionally provided with a penetrating reinforcing rib (314).

8. The winged anti-needle-stick intravenous catheter of claim 1, wherein: guide posts (322) are arranged on two sides of the middle of the spring plate seat (32), guide grooves (421) are arranged on the inner cavity wall of the needle seat (42) at positions corresponding to the guide posts (322), the guide posts (322) are inserted into the guide grooves (421), and the guide posts (322) are in sliding fit with the guide grooves (421).

9. The winged anti-needle-stick intravenous catheter of claim 1, wherein: the head end of the spring plate seat (32) is provided with a pushing handle (321).

10. The winged anti-needle-stick intravenous catheter of any one of claims 1-9, wherein: the periphery of the catheter (21) is sleeved with a sheath (1), and the tail end of the sheath (1) is fixedly connected with the catheter seat (23) through threads.

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