A guide needle for indwelling needle

Abstract

The present invention relates to the technical field of medical consumables, and in particular to an introducer needle for an indwelling needle. The introducer needle comprises a liquid storage tube, a metal wedge is provided at the end of the liquid storage tube, a catheter is provided at the end of the metal wedge, a notch needle seat is provided at one side away from the end of the liquid storage tube, a needle tube is provided at the end of the notch needle seat, the notch needle seat fits the inner wall of the catheter, a needle handle is provided above the notch needle seat, and a needle withdrawal assembly is provided above the liquid storage tube. In the present invention, when the needle withdrawal operation is performed, the end of the needle handle is pushed when the pressing block moves downward, so that the racks provided on both sides of the needle handle move in the horizontal direction, the racks drive the gear rod to rotate during the movement, the moving arc plate drives the rubber strip to move to both sides of the needle tube surface for fitting, and the rubber strip scrapes the blood attached to the needle tube surface. Since the cross section of the rubber strip is triangular, it can completely fit the needle tube surface, thereby avoiding the blood attached to the needle tube surface to cause secondary pollution to the environment and avoiding the occurrence of safety hazards.

Description

Technical Field

[0001] The invention relates to the technical field of medical consumables, and in particular to an introducer needle for an indwelling needle. Background Art

[0002] An intravenous catheter is a medical device widely used in clinical medicine. It is used for clinical medication and rescue of emergency and critically ill patients. It can reduce the pain of repeated punctures for patients and improve the work efficiency of medical staff. The guide needle for the intravenous catheter plays a key guiding role in the use of the intravenous catheter.

[0003] There are many existing technologies for the guide needle device, such as:

[0004] Chinese patent publication number CN217286735U discloses an introducer needle for an indwelling needle, comprising an indwelling needle body, a replacement mechanism is arranged on the outside of the indwelling needle body, a stabilizing mechanism is arranged below the replacement mechanism, the replacement mechanism comprises a liquid storage tank, a connecting block and a needle, the liquid storage tank is fixedly mounted on one end of the indwelling needle body, the liquid inlet of the liquid storage tank is communicated with the indwelling needle body, the connecting block is arranged on one side of the liquid storage tank, the needle is arranged on one side of the connecting block, and the stabilizing mechanism comprises a supporting block and a stabilizing ring. This application uses the interaction of a pull ring, a stabilizing ring, a rubber pad, a swing block, a torsion spring, a swing rod and a support block, and the swing block makes the stabilizing ring and the rubber pad close to the arm of the child. The rubber pad can reduce the discomfort of the child's arm being squeezed, which has the effect of facilitating the fixation of the indwelling needle body.

[0005] At present, when using traditional indwelling needles, medical staff use one hand to remove the needle, which can easily cause the liquid storage tube to shake, thereby causing the needle to move and scratch the vein. In addition, when the needle is pushed, blood adheres to the surface of the needle. When the patient has an infectious disease, it is easy to cause secondary environmental pollution when removing the needle, posing a safety hazard.

[0006] In view of this, we propose an introducer needle for an indwelling needle. Summary of the invention

[0007] The object of the present invention is to provide an introducer needle for an indwelling needle to solve the problems raised in the above-mentioned background technology.

[0008] To achieve the above object, the present invention aims to provide an introducer needle for an indwelling needle, comprising a liquid storage tube, a metal wedge is provided at the end of the liquid storage tube, a catheter is provided at the end of the metal wedge, a notch needle seat is provided on the side away from the end of the liquid storage tube, a needle tube is provided at the end of the notch needle seat, the notch needle seat fits the inner wall of the catheter, a needle handle is provided above the notch needle seat, a rack is provided on one side of the needle handle, a limit block is provided at the bottom of the needle handle, an extension tube is provided below the liquid storage tube, a flow stop clamp is provided on the surface of the extension tube, a colored tee is provided at the end of the extension tube, a heparin cap and an end cap are provided at both ends of the colored tee, a needle withdrawal assembly is provided above the liquid storage tube, the needle withdrawal assembly is used to slide and withdraw the needle tube, a scraping assembly is provided inside the liquid storage tube, the scraping assembly is driven by the needle withdrawal assembly to move relatively, so that the scraping assembly scrapes the surface of the moving needle tube, so that the blood adhered to the surface of the needle tube that needs to be withdrawn is retained in the liquid storage tube, and a limit assembly is provided at the end of the liquid storage tube, and the limit assembly is used to limit the moving notch needle seat.

[0009] As a further improvement of the present technical solution, the needle withdrawal assembly includes a limit plate arranged on the top of the liquid storage tube, a pressure block is slidably provided on the inner wall of the limit plate, and limit holes are provided on both sides of the surface of the pressure block. The height of the pressure block is higher than the needle handle, and the pressure block is arc-shaped and protrudes along the direction of the needle handle. Pressing the pressure block downward pushes the needle handle to move outward.

[0010] As a further improvement of the present technical solution, a compression spring is provided between the pressing block and the liquid storage tube. When the pressing block is pressed, the compression spring is squeezed, so that the pressing block encounters resistance during movement, causing the pressing block to move slowly downward, so that when the pressing block squeezes and pushes the end of the needle handle, it drives the slotted needle seat to slide at a uniform speed.

[0011] As a further improvement of the present technical solution, slots are provided on both sides of the limit plate, and limit rods are slidably provided in the slots. An elastic member is provided between the limit rod and the limit plate. When the pressure block moves down to the limit hole, the limit rod is popped out to the inner wall of the limit hole by the force of the elastic member to limit the pressure block.

[0012] As a further improvement of the technical solution, a slide groove is provided on the top of the liquid storage tube, and the limit block moves on the inner wall of the slide groove when the needle handle moves.

[0013] As a further improvement of the present technical solution, the scraping assembly includes a gear rod arranged on both sides of the liquid storage tube. When the rack moves, it drives the gear rod to rotate. A main gear is provided at the bottom of the gear rod, and a secondary gear is vertically meshed with one side of the main gear. A screw rod is provided at the end of the secondary gear. The screw rod passes through the outer wall of the liquid storage tube and rotates inside it.

[0014] As a further improvement of the technical solution, the thread on the surface of the screw rod is symmetrical, and movable arc plates are provided on both sides of the screw rod surface. The movable arc plates move horizontally on the surface of the screw rod, and rubber strips are provided inside the movable arc plates.

[0015] As a further improvement of the present technical solution, the movable arc plate is made of rubber and has a triangular cross-section. When the rubber strip drives the movable arc plate to move to the center position of the screw rod, the rubber strip adheres to the surface of the needle tube. When the needle tube moves, the movable arc plate scrapes the blood remaining on its surface, so that the blood remains inside the liquid storage tube.

[0016] As a further improvement of the present technical solution, the limiting assembly includes a support column arranged at the end of the liquid storage tube, a rotating plate is rotatably provided on the surface of the support column, a torsion spring is provided on the surface of the support column, and both ends of the torsion spring are respectively connected to the liquid storage tube and the torsion spring. In a natural state, the torsion spring is parallel to the end of the liquid storage tube due to the force of the rotating plate, and a through hole is opened at the end of the torsion spring, and the size of the through hole is adapted to the diameter of the needle tube.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. In the guide needle for the indwelling needle, the needle is introduced into the patient's vein by moving the liquid storage tube. When the needle tube drives the catheter to move completely to the vein, the medical staff pinches the two sides of the liquid storage tube with the thumb and middle finger, and presses the top of the pressing block with the index finger to make the pressing block slide vertically downward along the inner wall of the limit plate. Since a compression spring is provided between the pressing block and the liquid storage tube, the protrusion of the pressing block pushes the end of the needle handle during the movement, so that the needle handle drives the slot needle seat below to move in the horizontal direction. The slot needle seat drives the needle tube to move slowly and uniformly during the movement, so that the medical staff can stably control the speed of the needle tube withdrawal, avoid the shaking of the liquid storage tube causing the needle tube to puncture the blood vessel, and improve the success rate of the indwelling operation.

[0019] 2. In the guide needle for the indwelling needle, when the needle is withdrawn, the pressure block moves downward to push the end of the needle handle, so that the racks provided on both sides of the needle handle move in the horizontal direction. The racks drive the gear rod to rotate during the movement, and the main gear provided at the end of the gear rod rotates coaxially. When the main gear rotates, it drives the sub-gear to mesh and rotate, so that the screw rod provided at the end of the sub-gear rotates, and when the screw rod rotates, it drives the moving arc plate to move relative to each other. When the moving arc plate moves to the center of the screw rod, the moving arc plate drives the rubber strip to move to the two sides of the needle tube surface for scraping, thereby preventing blood from adhering to the surface of the needle tube to cause secondary pollution to the environment and avoiding safety hazards.

[0020] 3. In the guide needle for the indwelling needle, the notched needle seat pushes the end of the rotating plate. When the notched needle seat is away from the end of the rotating plate, the rotating plate is limited on both sides of the surface of the moving needle tube by the force of the torsion spring. The needle tube always remains perpendicular to the through hole during the movement, thereby avoiding position displacement of the needle tube during the movement and avoiding scratches on the catheter during the movement of the needle tube, thereby improving the patient's comfort. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0022] Figure 2 For the present invention Figure 1 Schematic diagram of point A;

[0023] Figure 3 It is a cross-sectional view of the overall structure of the present invention;

[0024] Figure 4 For the present invention Figure 3 Schematic diagram of point B;

[0025] Figure 5 It is a schematic diagram of the needle tube structure of the present invention;

[0026] Figure 6 It is a schematic diagram of the structure of the scraping assembly of the present invention;

[0027] Figure 7 It is a schematic diagram of the structure of the limiting component of the present invention.

[0028] The meaning of each number in the figure is:

[0029] 100, liquid storage tube; 101, metal wedge; 102, catheter; 103, extension tube; 104, flow stop clamp; 105, colored tee; 106, heparin cap; 107, end cap;

[0030] 200, notched needle seat; 201, needle tube; 202, needle handle; 203, rack; 204, limit block;

[0031] 300, needle withdrawal assembly; 301, limit plate; 302, pressure block; 303, compression spring; 304, limit hole; 305, limit rod; 306, elastic member;

[0032] 400, scraper assembly; 401, gear rod; 402, main gear; 403, secondary gear; 404, screw rod; 405, movable arc plate; 406, rubber strip;

[0033] 500, limit assembly; 501, support column; 502, rotating plate; 503, torsion spring; 504, through hole. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0036] The purpose of this embodiment is to provide a guide needle for an indwelling needle. Figure 1-Figure 7 As shown, it includes a liquid storage tube 100, a metal wedge 101 is provided at the end of the liquid storage tube 100, a catheter 102 is provided at the end of the metal wedge 101, a notched needle seat 200 is provided on the side away from the end of the liquid storage tube 100, a needle tube 201 is provided at the end of the notched needle seat 200, the notched needle seat 200 fits the inner wall of the catheter 102, a needle handle 202 is provided above the notched needle seat 200, a rack 203 is provided on one side of the needle handle 202, a limit block 204 is provided at the bottom of the needle handle 202, an extension tube 103 is provided below the liquid storage tube 100, a flow stop clamp 104 is provided on the surface of the extension tube 103, a colored tee 105 is provided at the end of the extension tube 103, and a colored A heparin cap 106 and an end cap 107 are respectively provided at both ends of the tee 105. A needle withdrawal assembly 300 is provided above the liquid storage tube 100. The needle withdrawal assembly 300 is used to slide and withdraw the needle tube 201. A scraping assembly 400 is provided inside the liquid storage tube 100. The scraping assembly 400 is driven by the needle withdrawal assembly 300 to move relatively, so that the scraping assembly 400 scrapes the surface of the moving needle tube 201, so that the blood adhered to the surface of the needle tube 201 that needs to be withdrawn remains in the liquid storage tube 100. A limiting assembly 500 is provided at the end of the liquid storage tube 100. The limiting assembly 500 is used to limit the moving slot needle seat 200.

[0037] The intravenous indwelling needle is a medical device widely used in clinical medicine. It can reduce the pain of repeated punctures for patients and improve the work efficiency of medical staff. When performing indwelling operation on a patient, the needle tube 201 needs to be pulled out. In the process of moving the notched needle seat 200 at the end of the needle tube 201, it is easy to cause the notched needle seat 200 to be overstressed, causing the liquid storage tube 100 to shake, causing puncture of the patient's veins, requiring a second indwelling operation. Therefore, the needle withdrawal assembly 300 includes a needle holder 200 disposed on the liquid storage tube 100. The limiting plate 301 at the top of 100, the inner wall of the limiting plate 301 is slidably provided with a pressing block 302, and limiting holes 304 are provided on both sides of the surface of the pressing block 302. The height of the pressing block 302 is higher than the needle handle 202, and the pressing block 302 is arc-shaped and convex along the direction of the needle handle 202. Pressing the pressing block 302 downward pushes the needle handle 202 to move outward. A compression spring 303 is provided between the pressing block 302 and the liquid storage tube 100. When the pressing block 302 is pressed, the compression spring 303 is squeezed, so that the pressing block 302 is subjected to resistance during the movement. The pressing block 302 is slowly moved downward, so that the pressing block 302 squeezes and pushes the end of the needle handle 202 to drive the notched needle seat 200 to slide at a uniform speed. When the needle needs to be withdrawn, the medical staff pinches the two sides of the liquid storage tube 100 with the thumb and middle finger, and presses the top of the pressing block 302 with the index finger, so that the pressing block 302 slides vertically downward along the inner wall of the limiting plate 301. Since a compression spring 303 is provided between the pressing block 302 and the liquid storage tube 100, during the pressing process of the pressing block 302, the pressing spring 303 is The reverse force on the pressing block 302 causes the pressing block 302 to move slowly downward. During the movement, the protrusion of the pressing block 302 pushes the end of the needle handle 202, causing the needle handle 202 to drive the slotted needle seat 200 below to move in the horizontal direction. During the movement, the slotted needle seat 200 drives the needle tube 201 to move slowly and uniformly, so that medical personnel can stably control the speed of withdrawing the needle tube 201, avoid shaking of the liquid storage tube 100 and cause the needle tube 201 to puncture the blood vessel, thereby improving the success rate of the indwelling operation.

[0038] When the pressing block 302 moves down to the end of the needle handle 202, in order to prevent the pressing block 302 from bouncing up due to the force of the compression spring 303, which makes it inconvenient to fix the liquid storage tube 100, slots are provided on both sides of the limiting plate 301, and a limiting rod 305 is slidably provided in the slot. An elastic member 306 is provided between the limiting rod 305 and the limiting plate 301. When the pressing block 302 moves down to the end of the limiting rod 305, the limiting rod 305 is popped up into the limiting hole 304 due to the force of the elastic member 306. The wall limits the pressing block 302. When the pressing block 302 moves down to near the top of the liquid storage tube 100, the limiting hole 304 at the end of the pressing block 302 slides to the limiting rod 305. When the resistance at the end of the limiting rod 305 disappears, the limiting rod 305 is reset by the force of the elastic member 306, so that the limiting rod 305 is inserted into the inner wall of the limiting hole 304, thereby quickly fixing the position of the pressing block 302, which is convenient for medical personnel to fix the position of the liquid storage tube 100 later.

[0039] Taking into account that the needle handle 202 is pushed and moved by the pressing block 302, in order to improve the stability of the needle handle 202, a slide groove is opened on the top of the liquid storage tube 100, and the limit block 204 moves on the inner wall of the slide groove when the needle handle 202 moves. When the pressing block 302 moves downward in the vertical direction to push the end of the needle handle 202, the limit block 204 provided at the bottom of the needle handle 202 slides on the inner wall of the slide groove, thereby limiting the moving direction of the needle handle 202 and improving the stability of the movement of the needle handle 202.

[0040] When the patient is given an indwelling needle, a small amount of blood is easily attached to the surface of the needle tube 201 as the needle tube 201 is inserted into the vein. Since some patients have infectious diseases, the blood attached to the surface of the needle tube 201 is easily brought out when the notched needle seat 200 drives the needle tube 201 to withdraw the needle, causing safety hazards. Therefore, the scraper assembly 400 includes a gear rod 401 arranged on both sides of the liquid storage tube 100. When the rack 203 moves, the gear rod 401 is driven to rotate. A main gear 402 is provided at the bottom of the gear rod 401. A sub gear 403 is vertically meshed with one side of the main gear 402. The sub gear A screw rod 404 is provided at the end of 403, and the screw rod 404 penetrates the outer wall of the liquid storage tube 100 and rotates inside the screw rod 404. The threads on the surface of the screw rod 404 are symmetrical. Moving arc plates 405 are provided on both sides of the surface of the screw rod 404. The moving arc plates 405 move horizontally on the surface of the screw rod 404. The rubber strip 406 is provided inside with a moving arc plate 405. The moving arc plate 405 is made of rubber and has a triangular cross-section. When the rubber strip 406 drives the moving arc plate 405 to move to the center position of the screw rod 404, the rubber strip 406 fits the surface of the needle tube 201. When the needle tube 201 moves, the moving arc plate 405 moves against the surface The residual blood on the surface is scraped to make the blood remain in the liquid storage tube 100. When the needle is withdrawn, the pressing block 302 moves downward to push the end of the needle handle 202, so that the racks 203 provided on both sides of the needle handle 202 move in the horizontal direction. The racks 203 drive the gear rod 401 to rotate during the movement. The main gear 402 provided at the end of the gear rod 401 rotates coaxially. When the main gear 402 rotates, it drives the sub-gear 403 to mesh and rotate, so that the screw rod 404 provided at the end of the sub-gear 403 rotates. When the screw rod 404 rotates, it drives the moving arc plate 405 to move relatively. When the movable arc plate 405 moves to the center of the screw rod 404, the movable arc plate 405 drives the rubber strip 406 to move to the two sides of the surface of the needle tube 201 for fitting. When the slotted needle seat 200 drives the needle tube 201 to move, the rubber strip 406 scrapes the blood attached to the surface of the needle tube 201. Since the cross-section of the rubber strip 406 is triangular, it can completely fit the surface of the needle tube 201 and will not affect the needle withdrawal speed of the needle tube 201 due to excessive friction, thereby avoiding the blood adhering to the surface of the needle tube 201 to cause secondary pollution to the environment, which is beneficial to avoid safety hazards.

[0041] Taking into account that during the movement of the needle tube 201, in order to ensure that the moving path of the needle tube 201 always remains horizontal and avoid scratching the inner wall of the catheter 102, it is necessary to perform a secondary operation on the patient, causing discomfort to the patient. Therefore, the limiting component 500 includes a support column 501 arranged at the end of the liquid storage tube 100, and a rotating plate 502 is rotatably provided on the surface of the support column 501. A torsion spring 503 is provided on the surface of the support column 501, and both ends of the torsion spring 503 are respectively connected to the liquid storage tube 100 and the torsion spring 503. In a natural state, the torsion spring 503 is parallel to the end of the liquid storage tube 100 under the force of the rotating plate 502, and a through hole 504 is provided at the end of the torsion spring 503. The size of the through hole 504 is adapted to the diameter of the needle tube 201. When in use, the rotating plate 502 is subjected to the force of the torsion spring 503. The end of the slot needle seat 200 is blocked to prevent the needle tube 201 at the end of the slot needle seat 200 from moving during puncture and needle insertion, thereby improving the stability of the needle tube 201. When the indwelling operation is completed, the needle handle 202 is pushed by the pressure block 302 to drive the slot needle seat 200 to move in the horizontal direction, and the slot needle seat 200 pushes the end of the rotating plate 502. When the slot needle seat 200 is away from the end of the rotating plate 502, the rotating plate 502 is limited by the force of the torsion spring 503 on both sides of the surface of the moving needle tube 201. The needle tube 201 always remains perpendicular to the through hole 504 during the movement, thereby preventing the needle tube 201 from shifting in position during the movement, and preventing the needle tube 201 from scratching the catheter 102 during the movement, thereby improving the patient's comfort.

[0042] In summary, the working principle of the present invention is as follows: when in use, the liquid storage tube 100 is moved to drive the needle tube 201 to insert the needle into the patient's vein. When the needle tube 201 drives the catheter 102 to move completely to the vein, the medical staff pinches the two sides of the liquid storage tube 100 with the thumb and middle finger, and presses the top of the pressing block 302 with the index finger, so that the pressing block 302 slides vertically downward along the inner wall of the limiting plate 301. Since a compression spring 303 is provided between the pressing block 302 and the liquid storage tube 100, when the pressing block 302 is pressed, the pressure of the pressing block 302 is increased. During the operation, the pressure block 302 is slowly moved downward by the reverse force of the compression spring 303. During the movement of the pressure block 302, the protrusion of the pressure block 302 pushes the end of the needle handle 202, so that the needle handle 202 drives the slot needle seat 200 below to move horizontally. During the movement, the slot needle seat 200 drives the needle tube 201 to move slowly and uniformly, so that the medical staff can stably control the speed of the needle tube 201 to withdraw the needle, avoid the shaking of the liquid storage tube 100 causing the needle tube 201 to puncture the blood vessel, and improve the success rate of the indwelling operation;

[0043] When the needle is withdrawn, the pressing block 302 moves downward to push the end of the needle handle 202, so that the racks 203 provided on both sides of the needle handle 202 move in the horizontal direction. The racks 203 drive the gear rod 401 to rotate during the movement. The main gear 402 provided at the end of the gear rod 401 rotates coaxially. The main gear 402 drives the sub-gear 403 to mesh and rotate during the rotation, so that the screw rod 404 provided at the end of the sub-gear 403 rotates. When the screw rod 404 rotates, it drives the moving arc plate 405 to move relatively. When the moving arc plate 405 moves to the center of the screw rod 404, the moving arc plate 405 drives the rubber strip 406 to move to the two sides of the surface of the needle tube 201 for fitting. When the notched needle seat 200 drives the needle tube 201 to move, the rubber strip 406 contacts the surface of the needle tube 201. The blood attached to the surface is scraped away. Since the cross-section of the rubber strip 406 is triangular, it can completely fit the surface of the needle tube 201, and will not affect the needle withdrawal speed of the needle tube 201 due to excessive friction, thereby avoiding blood adhering to the surface of the needle tube 201 to cause secondary pollution to the environment and avoid potential safety hazards. The notched needle seat 200 pushes the end of the rotating plate 502. When the notched needle seat 200 is away from the end of the rotating plate 502, the rotating plate 502 is limited by the force of the torsion spring 503 on both sides of the surface of the moving needle tube 201. The needle tube 201 always remains perpendicular to the through hole 504 during the movement, thereby avoiding position deviation of the needle tube 201 during the movement, and avoiding scratches on the catheter 102 during the movement of the needle tube 201, thereby improving the comfort of the patient.

[0044] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the present invention and are not intended to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A guide needle for an indwelling needle, characterized in that: The invention comprises a liquid storage tube (100), wherein a metal wedge (101) is provided at the end of the liquid storage tube (100), a catheter (102) is provided at the end of the metal wedge (101), a notched needle seat (200) is provided at a side away from the end of the liquid storage tube (100), a needle tube (201) is provided at the end of the notched needle seat (200), the notched needle seat (200) fits the inner wall of the catheter (102), a needle handle (202) is provided above the notched needle seat (200), a rack (203) is provided on one side of the needle handle (202), a limit block (204) is provided at the bottom of the needle handle (202), an extension tube (103) is provided below the liquid storage tube (100), a flow stop clamp (104) is provided on the surface of the extension tube (103), and the extension tube (103) is provided with a needle handle (202). A colored tee (105) is provided at the end of the liquid storage tube (103), and a heparin cap (106) and an end cap (107) are provided at both ends of the colored tee (105), respectively. A needle withdrawal assembly (300) is provided above the liquid storage tube (100), and the needle withdrawal assembly (300) is used to slide and withdraw the needle from the needle tube (201). The needle withdrawal assembly (300) comprises a limit plate (301) provided at the top of the liquid storage tube (100), and a pressing block (302) is slidably provided on the inner wall of the limit plate (301), and limit holes (304) are provided on both sides of the surface of the pressing block (302), and the height of the pressing block (302) is higher than the needle handle (202), and the pressing block (302) is arc-shaped and protrudes along the direction of the needle handle (202), and the pressing block (302) is pressed downward. The needle handle (202) is pushed to move outwards, and a compression spring (303) is provided between the pressing block (302) and the liquid storage tube (100). When the pressing block (302) is pressed, the compression spring (303) is squeezed, so that the pressing block (302) encounters resistance during movement, so that the pressing block (302) moves slowly downward, so that when the pressing block (302) squeezes and pushes the end of the needle handle (202), it drives the notched needle seat (200) to slide at a uniform speed. A scraping assembly (400) is provided inside the liquid storage tube (100), and the scraping assembly (400) is driven to move relatively by the needle withdrawal assembly (300), so that the scraping assembly (400) scrapes the surface of the moving needle tube (201), so that the surface of the needle tube (201) that needs to be withdrawn adheres to the surface of the needle tube (201). The blood is retained in the liquid storage tube (100), the scraping assembly (400) comprises gear rods (401) arranged on both sides of the liquid storage tube (100), the rack (203) drives the gear rod (401) to rotate when it moves, a main gear (402) is provided at the bottom of the gear rod (401), a sub-gear (403) is vertically meshed on one side of the main gear (402), a screw rod (404) is provided at the end of the sub-gear (403), the screw rod (404) penetrates the outer wall of the liquid storage tube (100) and rotates inside the liquid storage tube (100), the thread on the surface of the screw rod (404) is symmetrical, movable arc plates (405) are provided on both sides of the surface of the screw rod (404), and the movable arc plates (405) move horizontally on the surface of the screw rod (404),A rubber strip (406) is provided inside the movable arc plate (405), and a limiting assembly (500) is provided at the end of the liquid storage tube (100), and the limiting assembly (500) is used to limit the moving notch needle seat (200).

2. The guide needle for an indwelling needle according to claim 1, characterized in that: The limiting plate (301) is provided with slots on both sides, and limiting rods (305) are slidably provided in the slots. An elastic member (306) is provided between the limiting rod (305) and the limiting plate (301). When the pressing block (302) moves downward to the limiting hole (304), the limiting rod (305) is ejected to the inner wall of the limiting hole (304) by the force of the elastic member (306) to limit the pressing block (302).

3. The guide needle for an indwelling needle according to claim 1, characterized in that: A slide groove is provided at the top of the liquid storage tube (100), and when the needle handle (202) moves, the limit block (204) moves on the inner wall of the slide groove.

4. The guide needle for an indwelling needle according to claim 1, characterized in that: The movable arc plate (405) is made of rubber and has a triangular cross-section. When the rubber strip (406) drives the movable arc plate (405) to move to the center position of the screw rod (404), the rubber strip (406) fits the surface of the needle tube (201). When the needle tube (201) moves, the movable arc plate (405) scrapes the blood remaining on the surface thereof, so that the blood remains inside the liquid storage tube (100).

5. The guide needle for an indwelling needle according to claim 1, characterized in that: The limiting assembly (500) comprises a support column (501) arranged at the end of the liquid storage tube (100); a rotating plate (502) is rotatably provided on the surface of the support column (501); a torsion spring (503) is provided on the surface of the support column (501); two ends of the torsion spring (503) are respectively connected to the liquid storage tube (100) and the torsion spring (503); in a natural state, the torsion spring (503) is parallel to the end of the liquid storage tube (100) under the action of the rotating plate (502); a through hole (504) is opened at the end of the torsion spring (503); and the through hole size of the through hole (504) is adapted to the diameter of the needle tube (201).

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