CN115364307A - Safety type remaining needle with anti-reflux function - Google Patents

Abstract

The invention belongs to the field of medical instruments, and relates to a safe indwelling needle with a backflow prevention function, which comprises a catheter seat component, a spring plate seat component and a needle seat component, wherein one end of the spring plate seat component is inserted into the catheter seat component, and the other end of the spring plate seat component is inserted into the needle seat component; the needle stand component comprises a needle stand and a needle tube, and the rear end of the needle tube is fixedly connected with the needle stand; the catheter seat assembly comprises a catheter seat, the front end of the catheter seat is connected with a catheter, and an anti-reflux valve and a valve switch matched with the anti-reflux valve for working are fixed in an inner cavity of the catheter seat; the elastic sheet seat assembly comprises an elastic sheet seat, a spring clamping sheet is arranged in the elastic sheet seat, the tail end of the spring clamping sheet is fixed with the tail part of the elastic sheet seat, and the head end of the spring clamping sheet is provided with a front end hook body; the needle tube penetrates through the elastic sheet seat, the anti-reflux valve and the valve switch which are inserted into the guide tube seat penetrate out of the guide tube, and the front end hook body of the spring clamping sheet is positioned on one side of the needle tube. The invention can not only prevent blood from overflowing, but also avoid the condition that other people are injured by acupuncture after the needle is pulled out.

Description

Safety indwelling needle with anti-reflux function

technical field

The invention relates to a safety indwelling needle with anti-reflux function, which belongs to the field of medical equipment.

Background technique

The intravenous indwelling needle is a medical device used for clinical intravenous infusion therapy. When in use, the catheter and the needle tube are punctured into the blood vessel together. When the catheter is completely inserted into the blood vessel, the needle tube is withdrawn and only the soft catheter is left in the blood vessel. Perform infusion therapy. Because the use of indwelling needles can greatly reduce the number of infusion needle sticks, comprehensively reduce the pain of infusion patients and reduce the work intensity of medical staff, it is accepted by both doctors and patients.

However, compared with closed indwelling needles, the structure of straight indwelling needles is likely to cause blood spillage, resulting in lower application and popularity. When the straight indwelling needle is successfully punctured and the needle tube is withdrawn, the medical staff need to press the skin above the blood vessel where the catheter is located to seal the blood vessel to reduce blood outflow. However, this operation method requires close cooperation of both hands, and it is easy to seal incorrectly, causing blood to overflow, causing blood pollution, and causing panic in patients. In addition, needlestick injuries have become an important occupational injury faced by clinical medical staff. The main hazard of needlestick injuries is the occurrence of blood-borne infectious diseases. It is even more urgent to strengthen the protection of nursing staff against blood-borne infectious diseases. Therefore, it is an urgent problem for those skilled in the art to develop a safety indwelling needle with anti-reflux function.

Contents of the invention

The technical problem to be solved by the present invention is to propose a safe indwelling needle with anti-reflux function, which can not only prevent blood from spilling out, but also prevent the needle from injuring other patients after the needle is pulled out. personnel situation.

The safety indwelling needle with anti-reflux function of the present invention includes a catheter hub assembly, a shrapnel hub assembly and a needle hub assembly, one end of the shrapnel hub assembly is inserted into the catheter hub assembly, and the other end is inserted into the needle hub assembly; the needle hub assembly includes Needle seat and needle tube, the rear end of the needle tube is fixedly connected with the needle seat; the catheter seat assembly includes a catheter seat, the front end of the catheter seat is connected to a catheter, and an anti-reflux valve and a valve switch that cooperates with the anti-reflux valve are fixed in the inner cavity of the catheter seat; shrapnel The seat assembly includes a shrapnel seat, and a spring card is arranged in the shrapnel seat. The tail end of the spring card is fixed to the tail of the shrapnel seat, and the front end is provided with a front hook; The catheter is passed through, and the front hook body of the spring card is located on the side of the needle tube.

The front end of the shrapnel holder is inserted into the tail end of the catheter holder, and the rear end of the shrapnel holder is located in the inner cavity of the needle holder; in the initial state, the front hook body of the spring card is pushed up by the needle tube and is located on one side of the needle tube. At this time, the front hook body of the spring card is in the Under the action of elastic force, the needle tube is pressed tightly, and at this time, the needle tube passes through the anti-backflow valve, and the anti-backflow valve wraps the needle tube tightly. There will be no separation under the action of external force; in specific use, the needle holder is driven by the hand-held needle holder to puncture the needle tube, and at the same time the needle holder pushes the catheter at the front end of the catheter holder to puncture together with the needle tube. After the puncture is completed, the needle is withdrawn. When the head of the needle tube retreats to the rear of the front hook body of the spring card, the needle tube no longer has support for the front end hook body, so the front end hook body of the spring card falls back under the action of the elastic force. At this time, the needle tip of the needle tube is blocked by the front hook body , when the needle seat is dragged backward, the shrapnel seat will be separated from the catheter seat; after the needle tube withdraws from the anti-reflux valve, the anti-reflux valve will automatically close tightly to effectively prevent blood from spilling; The Luer conical connector is inserted into the catheter seat. When the infusion set is pushed forward, the infusion set pushes the valve switch forward, thereby opening the through cut of the anti-reflux valve to realize infusion therapy; A lock solution is injected into the component to prevent blood from flowing out. After the needle is withdrawn, the needle tip is blocked by the front hook body, which can effectively prevent the needle from injuring other personnel after the needle is withdrawn, and has high safety.

Preferably, the anti-backflow valve includes a valve body, the front end of the valve body is provided with a through cut, and the rear end of the valve body is provided with a valve cavity; the valve switch includes a switch body, the switch body is provided with a hollow flow cavity, and the front end of the switch body is inserted into the inside the valve cavity. The outer circumference of the valve body is stepped, and the large end of the front end of the valve body is fixedly installed with an interference fit with the inner cavity wall of the corresponding position of the catheter seat, and an undercut is added to the inner cavity wall of the catheter seat behind the large end of the front end of the valve body, and the undercut is stuck on the outer periphery of the valve body At the shaft shoulder, the front end of the valve body is clamped at the shaft shoulder of the inner cavity wall of the catheter seat, and the valve body is clamped, effectively preventing the valve body from moving arbitrarily.

Preferably, the through-cut is Y-shaped, and after the needle tube is pulled out, the Y-shaped through-cut is automatically closed under the action of elasticity to prevent blood from flowing out.

Preferably, the front end of the switch body is tapered, and barbs are provided on the outer periphery of the front end of the switch body. The back end of the valve body is provided with a closing hole, and the diameter of the closing hole is smaller than the diameter of the valve cavity and the diameter of the barb, so as to ensure that the valve switch barb is always in the anti-backflow valve during the process of pulling out the needle tube.

Preferably, a shrapnel fixing seat is provided at the rear end of the inner cavity of the shrapnel seat, a seat hole is provided in the middle of the shrapnel fixing seat, and a fixing groove is formed between the shrapnel fixing seat and the rear end plate of the shrapnel seat; an inverted U is provided at the tail of the spring card. Type groove, the front hook body is set at the front end of the inverted U-shaped groove, the rear end of the inverted U-shaped groove is provided with an elastic folding hook, the inverted U-shaped groove is stuck on the shrapnel fixing seat, and the elastic folding hook is located in the fixing groove; the needle tube Run through the rear end plate of the shrapnel seat, the rear limit hole on the side wall of the inverted U-shaped groove of the spring card, the seat hole and the front limit hole arranged at the front end of the shrapnel seat, and the elastic folding hook and the front hook body are respectively arranged on the needle tube. side; the front end of the needle tube is provided with an indentation, and the diameter of the indentation of the needle tube is larger than the diameter of the rear limit hole. The seat hole coincides with the rear limit hole; the forearm of the spring card is provided with reinforcing ribs to increase the strength of the forearm of the spring card and improve the elastic effect, which is conducive to the rapid rebound of the front hook body and enhance the anti-acupuncture effect; the spring card is not affected by the needle tube. It is in the original non-deformed state when the force is applied. At this time, the forearm of the spring card is flush with the opening of the inverted U-shaped groove, and it is in a deformed state when it is pushed up by the needle tube. Therefore, after the needle tube retreats, the front hook of the spring card rebounds quickly. Block the needle tip of the needle tube, and at this time, the indentation on the front end of the needle tube just moves to the rear limit hole. Since the diameter of the indentation of the needle tube is larger than the diameter of the rear limit hole, it will drive the needle tube during the process of operating the needle seat to continue to retreat. The shrapnel seat is separated from the catheter seat at the same time.

Preferably, a fixing hook is additionally provided on the inner cavity of the shrapnel fixing seat on the side of the shrapnel fixing seat close to the front hook body, and the spring card is stuck under the fixing hook. After the needle tube lifts the front hook body to deform the spring card, the fixed hook presses the spring card near the inverted U-shaped groove to prevent the spring card from being completely lifted, affecting the deformation effect and thus the rebound effect.

Preferably, a guide post is provided on the outer wall of the middle part of the shrapnel seat, guide chute is provided on both sides of the inner cavity wall of the needle seat, the guide post is inserted into the guide chute, and the guide post slidably fits with the guide chute. During installation, the guide column cooperates with the guide chute, which can ensure that the shrapnel seat and the needle seat are installed and matched smoothly, and can ensure that there will be no relative rotation between the spring seat and the needle seat during the process of holding the needle seat to control the withdrawal of the needle tube , to ensure that the spring card can better play a protective role.

Preferably, the top of the shrapnel seat corresponding to the spring card on the side of the front-end hook body is hollowed out, and a rear-end groove is added at the rear end of the inner cavity of the catheter holder, and the front-end hook body lifted by the needle tube is stuck in the rear-end groove. The front-end hook body is stuck in the rear-end groove to a certain extent to fix the catheter seat and the shrapnel seat. When the front-end hook body rebounds and leaves the rear-end groove, the catheter seat and the shrapnel seat can be easily separated.

Preferably, the front end of the shrapnel seat that cooperates with the inner cavity of the catheter adapter is a Luer conical joint, and the Luer conical joint is installed in cooperation with the inner cavity of the catheter adapter to effectively prevent the shrapnel seat from shaking.

Preferably, a raised supporting ring is provided on the outer periphery of the rear part of the switch body, and the outer diameter of the raised supporting ring matches the inner diameter of the inner cavity wall at the corresponding position of the catheter adapter, so as to effectively prevent the valve switch from shaking in the catheter adapter. The front end of the shrapnel seat is provided with an avoidance hole. The setting of the avoidance hole ensures that the rear end of the switch body and the shrapnel seat will not interact with each other to ensure that the overall size is small, and the setting of the avoidance hole can also avoid the valve switch in the conduit to a certain extent. Shaking in the seat.

The beneficial effect that the present invention has compared with prior art is:

The invention has reasonable structural design, and the setting of the anti-backflow valve can prevent blood from overflowing; and the setting of the shrapnel seat assembly and the cooperation with the catheter seat assembly and the needle seat assembly can effectively prevent the needle from injuring other personnel after the needle is pulled out.

Description of drawings

Figure 1 is a schematic diagram of the structure of a safety indwelling needle with anti-reflux function;

Fig. 2 is a schematic diagram of the structure of the catheter adapter assembly;

Fig. 3 is a partial enlarged view of A in Fig. 2;

Fig. 4 is a top view of the shrapnel seat assembly;

Fig. 5 is a perspective view of the shrapnel seat assembly;

Fig. 6 is a schematic structural diagram of the needle seat assembly;

Fig. 7 is a schematic diagram of cooperation between the catheter base assembly, the shrapnel base assembly and the needle base assembly (initial state);

Fig. 8 is a schematic diagram of the cooperation of the catheter base assembly, the shrapnel base assembly and the needle base assembly (the state after the needle is withdrawn);

Fig. 9 is a structural schematic diagram of an anti-backflow valve;

Fig. 10 is a schematic diagram of cooperation between the anti-reflux valve and the valve switch (state during infusion);

Fig. 11 is a sectional view of cooperation between the anti-reflux valve and the valve switch (state during infusion).

In the figure: 1. Catheter seat assembly; 2. Shrapnel seat assembly; 3. Needle seat assembly;

11. Catheter; 12. Catheter seat; 13. Anti-reflux valve; 14. Valve switch;

121, undercut; 122, rear end groove; 131, through cut; 132, valve cavity; 133, valve body; 141, raised support ring; 142, switch body; 143, hollow flow cavity; 144, barb;

21. Shrapnel seat; 22. Spring card;

211, fixed hook; 212, fixed groove; 213, shrapnel fixed seat; 214, front limit hole; 215, guide column; 216, seat hole; 217, avoidance hole;

221, front hook body; 222, reinforcing rib; 223, elastic folding hook; 224, inverted U-shaped groove; 225, rear limit hole; 31, needle tube; 32, needle seat; 311, indentation; 321, guide slide groove.

Detailed ways

The present invention will be further described below in conjunction with accompanying drawing:

As shown in Figures 1 to 11, the safety indwelling needle with anti-reflux function according to the present invention includes a catheter adapter assembly 1, a spring seat assembly 2 and a needle seat assembly 3, and one end of the spring seat assembly 2 is inserted into the catheter adapter assembly 1, The other end is inserted into the needle hub assembly 3; the needle hub assembly 3 includes a needle hub 32 and a needle tube 31, and the rear end of the needle tube 31 is fixedly connected to the needle hub 32; the catheter hub assembly 1 includes a catheter hub 12, and the front end of the catheter hub 12 is connected to a catheter 11, An anti-reflux valve 13 and a valve switch 14 cooperating with the anti-reflux valve 13 are fixed in the inner cavity of the catheter holder 12; The tail of the shrapnel seat 21 is fixed, and the head end is provided with a front hook body 221; the needle tube 31 runs through the shrapnel seat 21, inserted into the anti-reflux valve 13 and the valve switch 14 in the catheter seat 12, and passes out from the catheter 11, and the front end of the spring card 22 The hook body 221 is located on one side of the needle tube 31 .

In this example:

The anti-backflow valve 13 includes a valve body 133, the front end of the valve body 133 is provided with a through slit 131, and the rear end of the valve body 133 is provided with a valve cavity 132; the valve switch 14 includes a switch body 142, and the switch body 142 is provided with a hollow flow chamber 143, the switch The front end of the body 142 is inserted into the valve cavity 132 . The outer periphery of the valve body 133 is stepped, and the large end of the front end of the valve body 133 is fixedly installed with an interference fit with the corresponding position of the inner wall of the catheter seat 12, and an undercut 121 is added to the inner wall of the catheter seat 12 behind the large end of the front end of the valve body 133. Buckle 121 is stuck on the outer peripheral shoulder of valve body 133, and the big end of the front end of valve body 133 is stuck on the shoulder of the inner cavity wall of catheter base 12. Valve body 133 is clamped, effectively preventing valve body 133 from moving randomly. The through-cut 131 is Y-shaped, and after the needle tube 31 is pulled out, the Y-shaped through-cut 131 is automatically closed under the action of elasticity to prevent blood from flowing out.

The front end of the switch body 142 is tapered, and a barb 144 is disposed on the outer periphery of the front end of the switch body 142 . The rear end of the valve body 133 is provided with a closing hole, and the diameter of the closing hole is smaller than the diameter of the valve cavity 132 and the diameter of the barb 144 to ensure that the barb 144 of the valve switch 14 is always in the anti-backflow valve 13 during the process of pulling out the needle tube 31 .

The rear end of the shrapnel holder 21 inner cavity is provided with a shrapnel fixing seat 213, and the middle part of the shrapnel fixing seat 213 is provided with a seat hole 216, and between the shrapnel fixing seat 213 and the rear end plate of the shrapnel holder 21 is a fixing groove 212; Inverted U-shaped groove 224, front end hook body 221 is arranged on the front end of inverted U-shaped groove 224, and the rear end of inverted U-shaped groove 224 is provided with elastic folding hook 223, and inverted U-shaped groove 224 is stuck on the shrapnel holder 213, and the elastic Shape folding hook 223 is positioned in fixed groove 212; The front limit hole 214, the elastic folding hook 223 and the front end hook body 221 are respectively arranged on the different side of the needle tube 31; The seat hole 216 coincides with the rear limit hole 225; the forearm of the spring card 22 is provided with a reinforcing rib 222 to increase the strength of the forearm of the spring card 22 and improve the elastic effect, which is conducive to the rapid rebound of the front end hook body 221 and enhances the anti-acupuncture effect; The spring card 22 is in the original non-deformed state when it is not subjected to the force of the needle tube 31. At this time, the forearm of the spring card 22 is flush with the opening of the inverted U-shaped groove 224, and it is in a deformed state when it is pushed up by the needle tube 31. After retreating, the front end hook body 221 of the spring card 22 quickly rebounds to block the needle tip of the needle tube 31, and at this time, the front end of the needle tube 31 is provided with an indentation 311 and just moves to the rear limit hole 225, because the diameter of the needle tube 31 indentation 311 is The diameter is greater than the diameter of the rear limiting hole 225 , so when the operating needle seat 32 drives the needle tube 31 to continue to retreat, it drives the shrapnel seat 21 to separate from the catheter seat 12 at the same time.

A fixing hook 211 is added on the inner cavity of the shrapnel holder 21 near the side of the shrapnel fixing seat 213 of the front hook body 221 , and the spring card 22 is stuck under the fixing hook 211 . After the needle tube 31 lifts the front end hook body 221 to deform the spring card 22, the fixed hook 211 presses the spring card 22 close to the inverted U-shaped groove 224, so as to prevent the spring card 22 from being lifted up entirely, affecting the deformation effect, thereby affecting rebound effect.

A guide column 215 is provided on the outer wall of the middle part of the shrapnel seat 21, and guide chute 321 is provided on both sides of the inner cavity wall of the needle holder 32. During installation, the guide column 215 cooperates with the guide chute 321, which can ensure that the shrapnel seat 21 and the needle seat 32 are installed and matched smoothly, and can ensure that the spring seat 21 and the needle seat are in the process of holding the needle seat 32 to control the withdrawal of the needle tube 31. There will be no relative rotation between 32 to ensure that the spring card 22 can better play a protective role.

The top of the shrapnel seat 21 corresponding to the spring card 22 on the side of the front hook body 221 is hollowed out, and the rear end of the inner cavity of the catheter holder 12 is provided with a rear end groove 122, and the front end hook body 221 lifted by the needle tube 31 is stuck in the rear end groove 122 Inside. The front-end hook body 221 is stuck in the rear-end groove 122 to a certain extent to fix the catheter adapter 12 and the shrapnel seat 21. When the front-end hook body 221 rebounds away from the rear-end groove 122, the catheter adapter 12 and the shrapnel seat 21 can be Easily separates.

The front end of the shrapnel seat 21 that cooperates with the inner cavity of the catheter adapter 12 is a Luer conical joint, and the Luer conical joint is installed in cooperation with the inner cavity of the catheter adapter 12 to effectively prevent the shrapnel seat 21 from shaking.

A raised support ring 141 is provided on the rear periphery of the switch body 142 , and the outer diameter of the raised support ring 141 matches the inner diameter of the inner cavity wall at the corresponding position of the catheter adapter 12 to effectively prevent the valve switch 14 from shaking in the catheter adapter 12 . The front end of the shrapnel seat 21 is provided with a dodging hole 217, and the setting of the dodging hole 217 ensures that the overall size is small on the basis that the rear end of the switch body 142 and the shrapnel seat 21 will not interact with each other, and the setting of the dodging hole 217 is also to a certain extent. Rocking of the valve switch 14 in the catheter adapter 12 can be avoided.

The front end of the shrapnel holder 21 is inserted into the tail end of the catheter holder 12, and the rear end of the shrapnel holder 21 is located in the inner cavity of the needle holder 32; in the initial state, the front hook body 221 of the spring card 22 is pushed up by the needle tube 31 and is located on one side of the needle tube 31. When the front end hook body 221 of the spring card 22 presses the needle tube 31 under the action of elastic force, and at this time the needle tube 31 penetrates the anti-backflow valve 13, the anti-backflow valve 13 wraps the needle tube 31 tightly, and the catheter seat 12 is stuck on the head end of the needle seat 32 at the same time. The position of the shaft shoulder, the catheter hub assembly 1, the shrapnel hub assembly 2 and the needle hub assembly 3 will not be separated without external force; in specific use, the needle hub 32 is held in hand to drive the needle tube 31 to puncture, and the needle hub 32 pushes the catheter hub 12 at the same time The catheter 11 at the front end is punctured together with the needle tube 31. After the puncture is completed, the needle is withdrawn. Body 221 no longer has supporting force, so the hook body 221 at the front end of the spring card 22 falls back under the action of elastic force. The indentation 311 of the indentation drives the shrapnel seat 21 to retreat, and the shrapnel seat 21 is separated from the catheter seat 12; after the needle tube 31 withdraws from the anti-reflux valve 13, the anti-reflux valve 13 is automatically closed to effectively prevent blood from overflowing; when infusion is required, The outer luer conical connector of the infusion set is inserted into the catheter seat 12, when the infusion set is pushed forward, the infusion set pushes the valve switch 14 forward, thereby opening the through cutout 131 of the anti-reflux valve 13 to realize infusion therapy; After one infusion treatment, inject lock fluid into the catheter adapter assembly 1, and fasten a dry plastic cap on the tail end of the catheter adapter 12 to prevent blood from flowing out. After the needle is withdrawn, the needle tip is blocked by the front hook body 221, which can effectively prevent the needle from injuring other personnel after the needle is withdrawn, and has high safety.

Claims (10)

1. A safety indwelling needle with anti-reflux function, characterized in that it includes a catheter base assembly (1), a shrapnel seat assembly (2) and a needle base assembly (3), and one end of the shrapnel seat assembly (2) is inserted into the catheter base In the assembly (1), the other end is inserted into the needle hub assembly (3); the needle hub assembly (3) includes a needle hub (32) and a needle tube (31), and the rear end of the needle tube (31) is fixedly connected to the needle hub (32); The catheter adapter assembly (1) includes a catheter adapter (12), a catheter (11) is connected to the front end of the catheter adapter (12), and an anti-reflux valve (13) and an anti-reflux valve (13) are fixed in the inner cavity of the catheter adapter (12). The valve switch (14) that cooperates with the work; the shrapnel seat assembly (2) includes the shrapnel seat (21), and the spring clip (22) is arranged in the shrapnel seat (21), and the tail end of the spring card (22) and the tail of the shrapnel seat (21) fixed, the head end is provided with a front end hook body (221); the needle tube (31) runs through the shrapnel seat (21), and is inserted into the anti-reflux valve (13) and valve switch (14) in the catheter seat (12) from the catheter (11) and the front end hook body (221) of the spring card (22) is positioned at the side of the needle tube (31). 2. The safety indwelling needle with anti-reflux function according to claim 1, characterized in that: the anti-reflux valve (13) includes a valve body (133), and the front end of the valve body (133) is provided with a through cutout (131), Valve body (133) rear end is provided with valve cavity (132); Valve switch (14) comprises switch body (142), and switch body (142) is provided with hollow circulation cavity (143), and switch body (142) front end is inserted in Inside the valve cavity (132). 3. The safety indwelling needle with anti-reflux function according to claim 2, characterized in that: the through incision (131) is Y-shaped. 4. The safety indwelling needle with anti-backflow function according to claim 2 or 3, characterized in that: the front end of the switch body (142) is tapered, and the outer periphery of the front end of the switch body (142) is provided with a barb (144) . 5. The safety indwelling needle with anti-backflow function according to claim 1, characterized in that: a shrapnel fixing seat (213) is provided at the rear end of the inner cavity of the shrapnel seat (21), and a middle position of the shrapnel fixing seat (213) is set There is a seat hole (216), a fixing groove (212) between the spring clip fixing seat (213) and the rear end plate of the spring clip seat (21); an inverted U-shaped groove (224) is provided at the tail of the spring card (22), and the front hook body (221) is arranged on the front end of the inverted U-shaped groove (224), and the rear end of the inverted U-shaped groove (224) is provided with an elastic folding hook (223), and the inverted U-shaped groove (224) is stuck on the shrapnel holder (213) On the top, the elastic folding hook (223) is located in the fixing groove (212); the needle tube (31) runs through the rear end plate of the shrapnel seat (21) and the back of the inverted U-shaped groove (224) side groove wall of the spring card (22). Limit hole (225), seat hole (216) and the front limit hole (214) that is arranged on the front end of shrapnel seat (21), elastic folding hook (223) and front end hook body (221) are respectively arranged on needle tube (31) Different side; needle tube (31) front end is provided with indentation (311), and needle tube (31) indentation (311) place diameter is greater than rear limit hole (216) diameter. 6. The safety-type indwelling needle with anti-backflow function according to claim 5, characterized in that: the inner cavity of the shrapnel seat (21) on the side of the shrapnel fixing seat (213) close to the front hook body (221) is additionally provided with The fixed hook (211), the spring card (22) is stuck below the fixed hook (211). 7. The safety indwelling needle with anti-reflux function according to claim 1 or 5, characterized in that: the outer wall of the middle part of the shrapnel seat (21) is provided with a guide post (215), and the inner cavity wall of the needle seat (32) on both sides A guide chute (321) is provided, and the guide post (215) is inserted into the guide chute (321), and the guide post (215) is slidingly matched with the guide chute (321). 8. The safety indwelling needle with anti-reflux function according to claim 1 or 5, characterized in that the top of the shrapnel seat (21) corresponding to the spring card (22) on the side of the front hook body (221) is hollowed out , the catheter base (12) lumen rear end is additionally provided with a rear end groove (122), and the front end hook body (221) jacked up by the needle tube (31) is stuck in the rear end groove (122). 9. The safety indwelling needle with anti-reflux function according to claim 1 or 5, characterized in that: the front end of the shrapnel seat (21) matched with the inner cavity of the catheter seat (12) is a Luer conical joint, and the Luer conical joint The joint is installed in cooperation with the inner chamber of the catheter adapter (12). 10. The safety indwelling needle with anti-reflux function according to claim 2, characterized in that: a raised support ring (141) is provided on the outer periphery of the rear part of the switch body (142), and the outer diameter of the raised support ring (141) is Cooperate with the inner diameter of the lumen wall at the corresponding position of the catheter adapter (12).

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