Vein blood taking needle capable of preventing needle stick injury

Abstract

The utility model belongs to the technical field of medical instruments, particularly relates to a vein blood taking needle capable of preventing needle stick injury, and aims to solve the problems that an existing device cannot achieve a good protection effect and cannot achieve the effect of thoroughly avoiding reuse and accidental puncture, and the reliability of preventing secondary exposure of a waste blood taking needle is poor. Comprising a blood collection end, a catheter and a butt joint end, the blood collection end comprises a needle tube outer cylinder, a needle head and a clamping sliding groove unit, the needle head can be prevented from being exposed, the good puncture prevention effect is achieved, a bending assembly is further arranged, when a needle head base pulls a pull rope, a C-shaped push plate can be ejected out in the direction of a top plate through the action of a pushing unit, and therefore the puncture prevention effect is achieved. Therefore, the needle head can be bent in cooperation with the top plate, the needle head is prevented from stretching out again, the effect of completely eradicating reuse and accidental puncture can be achieved, and the reliability of preventing secondary exposure is greatly improved.

Description

Technical Field

[0001] The utility model relates to a blood collection needle, in particular to a needle-puncture-proof venous blood collection needle, belonging to the technical field of medical devices. Background Art

[0002] A venous blood collection needle is a medical device used to collect blood samples during medical examinations. In medical practice, venous blood collection is a key step in diagnosis and treatment, but needlestick injuries caused by improper handling of needles after use have always been a major safety hazard in the medical and health field. Among them, the risk of hepatitis B, hepatitis C and HIV infection caused by secondary exposure of blood collection needles for medical staff is significantly increased;

[0003] The anti-needlestick blood collection needles currently on the market, such as the one disclosed in announcement number CN209048151U, include a needle body, a needle seat, a needle cap and a catheter, and a tubular sheath. The tubular sheath is added so that the blood collection needle does not need to retrieve the needle cap and re-wrap the needle body after use. Instead, the sheath can be moved from the outside of the needle seat to the outside of the needle body by rotating the knob, and finally the needle body is enclosed, effectively preventing the discarded blood collection needle from being contaminated again. However, the sheath needs to be rotated after use to enclose the needle body, and the medical staff needs to actively slide the sheath, which is easy to miss in an emergency, and thus cannot provide good prevention. Protection effect, secondly, as disclosed in announcement number CN213155902U, a puncture prevention structure for a blood collection needle comprises a control module, an outer needle tube, a connecting tube and an internal thread of a connecting tube sleeve, and a first spring and a pressure-type release are arranged inside the control module to facilitate manual control of the contraction of the blood collection needle to prevent leakage and injuring medical personnel. Although this structure can realize the automatic contraction of the blood collection needle, the contracted blood collection needle still has the risk of being pushed out for secondary use, that is, the used blood collection needle cannot be completely destroyed, and it cannot completely prevent reuse and accidental puncture, and the reliability of preventing the discarded blood collection needle from being exposed for secondary exposure is poor. Utility Model Content

[0004] The utility model provides a needle-stick-proof venous blood collection needle to solve the problems that the existing devices cannot provide good protection effects and cannot completely prevent reuse and accidental puncture, and have poor reliability in preventing secondary exposure.

[0005] The utility model achieves the above-mentioned purpose through the following technical scheme: a needle-stick-proof venous blood collection needle, comprising a blood collection end, a catheter and a docking end, wherein the blood collection end and the docking end are respectively connected to the two ends of the catheter;

[0006] The blood collection end includes a needle tube outer tube and a needle. A needle seat is arranged inside the needle tube outer tube. The needle is fixedly connected to the needle seat. The needle is connected to the catheter. A positioning slide groove unit is arranged on the inner wall of the needle tube outer tube. The needle seat is connected to a limiting block. The limiting block is movably clamped in the positioning slide groove unit.

[0007] The positioning slide unit includes a limiting slot, and the two sides of the limiting slot are respectively connected with a forward push inclined slide and a rear pull slide, the bottom end of the rear pull slide is opened at a position lower than the bottom end of the forward push inclined slide, the limiting block is movably penetrated by a movable positioning slide bar, a bending component is arranged in the outer cylinder of the needle tube, and a pull rope is connected to the bending component and the needle seat;

[0008] The bending assembly includes a bending base, a C-shaped push plate and a top plate. The bending base and the top plate are fixedly connected to the inner wall of the outer cylinder of the needle tube. The C-shaped push plate is movably arranged in the bending base. The C-shaped push plate and the top plate are arranged on both sides of the needle. A push unit is arranged in the bending base.

[0009] As a further solution of the utility model: the wall of the outer tube of the syringe is provided with a handle movable groove and a handle limiting groove, the handle limiting groove is connected to the front end side of the handle movable groove, the seat body of the needle seat is provided with an annular inner groove, a ring is movably sleeved in the annular inner groove, a handle is fixedly connected to the ring body of the ring, and the handle passes through the handle movable groove.

[0010] As a further solution of the utility model: a seal is pasted on the outer side of the wall of the needle tube outer tube where the handle movable groove is provided, and the seal is pasted on the front side of the handle in the outward pushing direction.

[0011] As a further solution of the utility model: the front end of the barrel of the needle tube outer barrel is conical, and the top opening of the needle tube outer barrel is connected to a needle plugging rubber pad.

[0012] As a further solution of the utility model: a movable positioning slide rod passes through a rod body of a limiting block and is fixedly connected to a slide rod positioning ring; the limiting block is provided with a through channel, and the inner wall of the through channel is provided with two sets of slide rod positioning grooves.

[0013] As a further solution of the utility model: a through groove is provided at one end of the C-shaped push plate opposite to the top plate, and the needle movably passes through the through groove provided by the C-shaped push plate and the top plate.

[0014] As a further solution of the utility model: an inner cavity is opened in the seat body of the bending base, and the pushing unit is placed in the inner cavity. The pushing unit includes an inclined push block and a bent push rod. The bent push rod is fixedly connected to one end of the C-shaped push plate located in the inner cavity, and the other end of the bent push rod is against the inclined surface of the inclined push block. The vertical surface of the inclined push block is placed on the inner wall of the inner cavity. The bottom end of the inclined push block is fixedly connected to the pull rope, and an anti-slip rubber ring is provided at one end of the C-shaped push plate located in the inner cavity.

[0015] As a further solution of the utility model: the docking end includes a docking outer tube and a tube plug needle, the bottom end of the tube plug needle is fixedly connected to the bottom of the docking outer tube, and the tube plug needle is connected to the catheter, and the front end inner wall of the docking outer tube is connected with a docking positioning block.

[0016] As a further solution of the utility model: a limited inner concave wall is provided on the inner wall of the docking outer tube, a pressure plate is movably arranged in the limited inner concave wall, a pipe plug needle sealing pad is connected to the middle part of the pressure plate, and a compression spring is also arranged in the docking outer tube, and the compression spring is against the bottom of the pressure plate.

[0017] The beneficial effects of the utility model are:

[0018] 1. The blood collection end provided by the utility model comprises a needle tube outer barrel and a needle, a needle seat is provided in the needle tube outer barrel, a positioning slide slot unit is provided on the inner wall of the needle tube outer barrel, the needle seat is connected to a limiting clamp block, and the limiting clamp block is movably clamped in the positioning slide slot unit, so that the needle seat can be moved in the needle tube outer barrel to push the needle outward, and then the needle can be inserted into the vein during the needle pushing process to perform venous blood collection operation, and when the blood collection is completed and the needle is pulled out, the needle can be retracted into the needle tube outer barrel, so that the exposure of the needle can be avoided, and a better puncture prevention effect is played, and in the process of pushing out and retracting the needle, the positioning slide slot unit can ensure that the needle seat moves along a set path, and then the needle can be fixed to the needle tube outer barrel during use so as to facilitate smooth pushing out and retraction of the needle;

[0019] 2. The positioning slide slot unit provided in the utility model comprises a limiting slot, the two sides of the limiting slot are respectively connected with a forward push inclined plane slide slot and a rear pull slide slot, the limiting block is movably penetrated by a movable positioning slide rod, a bending assembly is provided in the outer tube of the needle tube, and a pull rope is connected to the bending assembly and the needle seat, when the needle seat is pushed forward, the limiting block slides in the limiting slot, and at the same time the movable positioning slide rod is pushed into the rear pull slide slot along the inclined surface of the forward push inclined plane slide slot, so when the needle seat is pulled backward, the limiting block slides in the limiting slot and the movable positioning slide rod moves in the rear pull slide slot, that is, the recovery position of the needle seat after use can be lower than the initial position when the needle seat is not in use, that is, the pull rope can be pulled to drive the bending assembly to bend the needle;

[0020] 3. The bending assembly provided in the utility model includes a bending base, a C-shaped push plate and a top plate. A push unit is provided in the bending base. When the needle seat pulls the pull rope, the C-shaped push plate can be pushed out toward the top plate by the push unit, that is, it can cooperate with the top plate to form a bend for the needle to prevent the needle from extending again, which can completely prevent reuse and accidental puncture, and greatly improve the reliability of preventing secondary exposure;

[0021] 4. The utility model is provided with a docking end, which includes a docking outer cylinder, a tube plugging needle, a pressure plate and a tube plugging needle sealing pad. By arranging a docking outer cylinder on the outside of the tube plugging needle, the tube plugging needle can be prevented from touching medical staff, that is, it can have a better protective effect, and when the docking outer cylinder is sleeved on the tube cover of the blood collection tube, the pressure plate is pressed inwardly so that the tube plugging needle can pierce the tube plugging needle sealing pad before piercing the tube cover of the blood collection tube for blood collection, and when the blood collection is completed, the compression spring can push the pressure plate back to the initial position to form a blockage for the tube plugging needle to prevent the remaining blood in the tube plugging needle from dripping outside the tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0023] Figure 2 This is a schematic diagram of the structure of the blood collection end of the utility model;

[0024] Figure 3 This is a schematic diagram of the cross-sectional structure of the blood sampling end of the utility model;

[0025] Figure 4 This is a schematic diagram of the cross-sectional structure of the outer barrel of the needle tube of the utility model;

[0026] Figure 5 This is a schematic diagram of the structure of the clamping chute unit of the utility model;

[0027] Figure 6 This is a schematic diagram of the needle seat structure of the utility model;

[0028] Figure 7 This is a schematic diagram of the needle seat and handle separation structure of the utility model;

[0029] Figure 8 This is a schematic diagram of the cross-sectional structure of the limit card block of the utility model;

[0030] Fig. 9 This is a schematic diagram of the docking end structure of the utility model;

[0031] Fig.10 For this utility model Figure 4 Schematic diagram of the structure at A in the middle;

[0032] Fig.11 It is a schematic diagram of the cross-sectional structure of the bent base of the utility model.

[0033] In the figure: 1, blood collection end; 11, needle tube outer tube; 12, handle movable slot; 13, handle limit slot; 14, needle seat; 15, handle; 16, collar; 17, needle; 18, limit block; 19, pull rope; 110, limit slot; 111, forward push inclined slide slot; 112, rear pull slide slot; 113, needle plugging rubber pad; 114, annular inner groove; 115, movable positioning slide rod; 116, slide rod positioning slot; 1 17. Slide rod positioning ring; 2. Catheter; 3. Docking end; 31. Docking outer tube; 32. Limiting inner concave wall; 33. Pipe plug needle; 34. Compression spring; 35. Pressure plate; 36. Pipe plug needle sealing pad; 37. Docking positioning block; 4. Bending assembly; 41. Bending base; 42. C-type push plate; 43. Top plate; 44. Groove; 45. Inner cavity; 46. Inclined push block; 47. Bending push rod; 48. Anti-slip rubber ring; 5. Seal. DETAILED DESCRIPTION

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

[0035] Embodiment 1

[0036] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 6 , Figure 8 and Fig.11 As shown, a needle-stick-proof venous blood collection needle comprises a blood collection end 1, a catheter 2 and a docking end 3, wherein the blood collection end 1 and the docking end 3 are respectively connected to two ends of the catheter 2;

[0037] The blood collection end 1 includes a needle tube outer tube 11 and a needle 17. A needle seat 14 is arranged inside the needle tube outer tube 11. The needle 17 is fixedly connected to the needle seat 14. The needle 17 is connected to the catheter 2. A positioning slot unit is provided on the inner wall of the needle tube outer tube 11. The needle seat 14 is connected to a limiting block 18. The limiting block 18 is movably placed in the positioning slot unit. The needle seat 14 can be moved inside the needle tube outer tube 11 to push the needle 17 outward, and then the needle 17 can be pushed outward. During the process of drawing blood from the vein, the needle 17 is inserted into the vein to draw blood from the vein. When the blood drawing is finished and the needle 17 is drawn out, the needle 17 can be retracted into the outer barrel 11 of the needle tube, so as to avoid the exposure of the needle 17 and play a better role in preventing punctures. In addition, during the process of pushing out and retracting the needle 17, the provided positioning slide groove unit can ensure that the needle seat 14 moves along a set path, so that the needle 17 can be smoothly pushed out and retracted by fixing the outer barrel 11 of the needle tube during use.

[0038] The positioning slot unit includes a limiting slot 110, and the two sides of the limiting slot 110 are respectively connected with a forward push inclined slot 111 and a rear pull slot 112, the bottom end of the rear pull slot 112 is opened at a position lower than the bottom end of the forward push inclined slot 111, and the limiting block 18 is movably penetrated by a movable positioning slide rod 115, and a bending component 4 is arranged in the outer tube 11 of the needle tube, and the bending component 4 is connected to the needle seat 14 with a pull rope 19. When the needle seat 14 is pushed forward, the limiting block 18 slides in the limiting slot 110. At the same time, the movable positioning slide bar 115 is pushed into the rear pull slide groove 112 along the inclined surface of the forward push inclined slide groove 111. Therefore, when the needle seat 14 is pulled backward, the limit block 18 slides in the limit slot 110 and the movable positioning slide bar 115 moves in the rear pull slide groove 112, that is, the recovery position of the needle seat 14 after use can be lower than the initial position of the needle seat 14 when it is not in use, that is, the pull rope 19 can be pulled to drive the bending assembly 4 to bend the needle 17;

[0039] The bending assembly 4 includes a bending base 41, a C-shaped push plate 42 and a top plate 43. The bending base 41 and the top plate 43 are fixedly connected to the inner wall of the needle tube outer cylinder 11. The C-shaped push plate 42 is movably arranged in the bending base 41. The C-shaped push plate 42 and the top plate 43 are arranged on both sides of the needle 17. A pushing unit is arranged in the bending base 41. When the needle seat 14 pulls the pull rope 19, the C-shaped push plate 42 can be pushed out toward the top plate 43 by the pushing unit, that is, it can cooperate with the top plate 43 to form a bend for the needle 17 to prevent the needle 17 from extending again, which can completely prevent reuse and accidental puncture, and greatly improve the reliability of preventing discarded blood collection needles from being exposed again.

[0040] Embodiment 2

[0041] Improvements based on Example 1:

[0042] like Figures 1 to 8 As shown, the wall of the syringe outer tube 11 is provided with a handle movable groove 12 and a handle limiting groove 13, the handle limiting groove 13 is connected to the front end side of the handle movable groove 12, and the seat body of the needle seat 14 is provided with an annular inner groove 114, and a ring 16 is movably sleeved in the annular inner groove 114, and a handle 15 is fixedly connected to the ring body of the ring 16, and the handle 15 passes through the handle movable groove 12, so that the medical staff can clamp the handle 15 with their fingers to drive the needle seat 14 to move, and when the handle 15 moves to the front end of the syringe outer tube 11 along the handle movable groove 12, the handle 15 can be rotated by the action of the ring 16, that is, the handle 15 can be limited and placed in the handle limiting groove 13, that is, the position of the needle seat 14 after being pushed out can be limited and fixed, so as to facilitate the medical staff to perform venous blood collection operations.

[0043] Furthermore, a seal 5 is attached to the outer side of the wall of the outer tube 11 of the needle tube where the handle movable groove 12 is provided, and the seal 5 is attached to the front side of the outward pushing direction of the handle 15. The limiting effect of the seal 5 can prevent the handle 15 from being pushed out along the handle movable groove 12, that is, it is ensured that the seal 5 needs to be torn off before use so that the blood collection needle can be used normally, which also plays a certain protective role.

[0044] Furthermore, the front end of the barrel of the needle tube outer tube 11 is conical, and a needle blocking rubber pad 113 is connected to the top opening of the needle tube outer tube 11. The conical front end can greatly reduce the obstruction of the medical staff's line of sight by the needle tube outer tube 11, so that the needle can be more accurately aimed at the vein during blood collection. At the same time, the needle blocking rubber pad 113 can block the opening at the top of the needle tube outer tube 11. When the needle 17 is extended, it can pierce the rubber pad. When the needle 17 is retracted, the rubber pad can form a seal again to prevent the residual blood in the needle 17 from dripping outside the tube.

[0045] Furthermore, the movable positioning slide bar 115 passes through the rod body of the limiting block 18 and is fixedly connected with a slide bar positioning ring 117. The limiting block 18 is provided with a through channel, and the inner wall of the through channel is provided with two sets of slide bar positioning grooves 116. When the movable positioning slide bar 115 is in the initial position, the slide bar positioning ring 117 can be placed in the slide bar positioning groove 116 close to the side of the forward push inclined plane slide groove 111. At this time, the protruding end of the movable positioning slide bar 115 is located in the forward push inclined plane slide groove 111. As the head seat 14 is continuously pushed forward, the movable locking slide bar 115 is pushed into the rear pull slide groove 112 along the inclined surface of the forward push inclined plane slide groove 111. At this time, the slide bar positioning ring 117 is clamped in the slide bar positioning groove 116 on the side away from the forward push inclined plane slide groove 111, and the protruding end of the movable locking slide bar 115 is located in the rear pull slide groove 112 to ensure that when the needle seat 14 is retracted backward, the recovery position of the needle seat 14 can be lower than the initial position when the needle seat 14 is not in use, so that the pull rope 19 can be pulled.

[0046] like Figure 1 , Figure 3 , Fig.10 and Fig.11 As shown, a through groove 44 is provided at the opposite end of the C-shaped push plate 42 and the top plate 43, and the needle 17 is movable through the through groove 44 provided by the C-shaped push plate 42 and the top plate 43, so that when the C-shaped push plate 42 and the top plate 43 squeeze and bend the needle 17, the through groove 44 provided can limit the needle 17, that is, to ensure that the needle 17 can be bent to a large extent, so that the needle 17 is completely damaged and cannot be used a second time.

[0047] Furthermore, an inner cavity 45 is provided in the body of the bending base 41, and the pushing unit is arranged in the inner cavity 45. The pushing unit includes an inclined surface push block 46 and a bent push rod 47. The bent push rod 47 is fixedly connected to one end of the C-shaped push plate 42 located in the inner cavity 45, and the other end of the bent push rod 47 is against the inclined surface of the inclined surface push block 46. The vertical surface of the inclined surface push block 46 is placed on the inner wall of the inner cavity 45, and the bottom end of the inclined surface push block 46 is fixed to the pull rope 19. A non-slip rubber ring 48 is sleeved on one end of the C-shaped push plate 42 located in the inner cavity 45, and the bent push rod 47 can be pushed outward by pulling the inclined push block 46 with the pull rope 19, so that the C-shaped push plate 42 can be pushed. In addition, the non-slip rubber ring 48 can ensure the stability of the installation position of the C-shaped push plate 42 when the pull rope 19 does not pull the inclined push block 46, so as to avoid affecting the pushing out and retracting action of the needle 17.

[0048] like Figure 1 and Fig. 9As shown, the docking end 3 includes a docking outer tube 31 and a tube plugging needle 33. The bottom end of the tube plugging needle 33 is fixedly connected to the bottom of the docking outer tube 31, and the tube plugging needle 33 is connected to the catheter 2. The front end inner wall of the docking outer tube 31 is connected with a docking positioning block 37. When blood is collected, the docking outer tube 31 can be sleeved on the outside of the tube cover of the blood collection tube. At this time, the tube plugging needle 33 can pierce the tube cover of the blood collection tube to collect blood. That is, by arranging a docking outer tube 31 on the outside of the tube plugging needle 33, the tube plugging needle 33 can be prevented from touching the medical staff, that is, it can have a better protective effect, and the docking positioning block 37 can make the docking outer tube 31 firmly docked with the tube cover of the blood collection tube to prevent it from falling off.

[0049] Furthermore, a limited inner concave wall 32 is provided on the inner wall of the docking outer cylinder 31, and a pressure plate 35 is movably arranged in the limited inner concave wall 32. The middle part of the pressure plate 35 is connected to a tube plugging needle sealing pad 36. A compression spring 34 is also provided in the docking outer cylinder 31. The compression spring 34 abuts against the bottom of the pressure plate 35. When the docking outer cylinder 31 is sleeved on the tube cover of the blood collection tube, the pressure plate 35 can be pressed inwardly so that the tube plugging needle 33 can pierce the tube plugging needle sealing pad 36 before piercing the tube cover of the blood collection tube for blood collection. When the blood collection is completed, the compression spring 34 can push the pressure plate 35 back to the initial position to form a seal for the tube plugging needle 33 to prevent the residual blood in the tube plugging needle 33 from dripping out of the cylinder.

[0050] Working principle: When collecting blood, the docking outer cylinder 31 is sleeved on the outer side of the tube cover of the blood collection tube. At this time, the tube plugging needle 33 can pierce the tube cover of the blood collection tube to collect blood. That is, by arranging a docking outer cylinder 31 on the outer side of the tube plugging needle 33, it can prevent the tube plugging needle 33 from touching the medical staff, that is, it can have a better protective effect. The docking positioning block 37 can make the docking outer cylinder 31 firmly docked with the tube cover of the blood collection tube to prevent it from falling off. The needle seat 14 moves in the needle tube outer cylinder 11 to be able to The needle 17 is pushed outward, and then the vein can be pierced during the process of pushing the needle 17 out to perform venous blood collection. The medical staff clamps the handle 15 with their fingers to drive the needle seat 14 to move. When the needle seat 14 is pushed forward, the limit block 18 slides in the limit slot 110, and the movable position slide bar 115 is pushed into the rear pull slot 112 along the inclined surface of the forward push inclined slot 111. When the blood collection is completed and the needle 17 is pulled out, the needle 17 can be retracted into the outer tube 11 of the syringe to avoid the needle 1 7 is exposed, which plays a better role in preventing stab injuries. When the needle seat 14 is pulled backward, the limit block 18 slides in the limit slot 110 and the movable block slide bar 115 moves in the rear pull slot 112, that is, the recovery position of the needle seat 14 after use can be lower than the initial position of the needle seat 14 when it is not in use, that is, the pull rope 19 can be pulled to drive the bending assembly 4 to bend the needle 17, and the pull rope 19 can pull the inclined push block 46 to make the bending push rod 47 be pushed outward, that is, it can The C-shaped push plate 42 is pushed, and the top plate 43 is cooperated to form a bend for the needle 17 to prevent the needle 17 from extending again, which can completely prevent reuse and accidental puncture, and the reliability of preventing discarded blood collection needles from being exposed again is greatly improved. In the process of pushing out and retracting the needle 17, the positioning slot unit is provided to ensure that the needle seat 14 moves along the set path, and then when in use, the outer barrel 11 of the syringe can be fixed to facilitate the smooth pushing out and retraction of the needle 17.

[0051] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

[0052] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A needle-stick-proof venous blood collection needle, comprising a blood collection end (1), a catheter (2) and a docking end (3), characterized in that: The blood sampling end (1) and the docking end (3) are respectively connected to two ends of the catheter (2); The blood sampling end (1) comprises a needle tube outer tube (11) and a needle (17); a needle seat (14) is arranged inside the needle tube outer tube (11); the needle (17) is fixedly connected to the needle seat (14); the needle (17) is communicated with the catheter (2); a positioning slide groove unit is provided on the inner wall of the needle tube outer tube (11); the needle seat (14) is connected to a limiting block (18); and the limiting block (18) is movably positioned on the positioning slide groove unit; The positioning slot unit comprises a limiting slot (110), the two sides of the limiting slot (110) are respectively connected with a forward push inclined slot (111) and a rear pull slot (112), the bottom end of the rear pull slot (112) is opened at a position lower than the bottom end of the forward push inclined slot (111), the limiting block (18) is movably penetrated by a movable positioning slide rod (115), the needle tube outer cylinder (11) is provided with a bending component (4), and the bending component (4) and the needle seat (14) are connected by a pull rope (19); The bending assembly (4) comprises a bending base (41), a C-shaped push plate (42) and a top plate (43); the bending base (41) and the top plate (43) are fixedly connected to the inner wall of the needle tube outer cylinder (11); the C-shaped push plate (42) is movably arranged in the bending base (41); the C-shaped push plate (42) and the top plate (43) are arranged on both sides of the needle head (17); and a push unit is arranged in the bending base (41).

2. The needle-stick-proof venous blood collection needle according to claim 1, characterized in that: The wall of the needle tube outer tube (11) is provided with a handle movable through groove (12) and a handle limiting through groove (13), the handle limiting through groove (13) is connected to the front end side of the handle movable through groove (12), the seat body of the needle seat (14) is provided with an annular inner groove (114), a sleeve (16) is movably sleeved in the annular inner groove (114), a handle (15) is fixedly connected to the ring body of the sleeve (16), and the handle (15) passes through the handle movable through groove (12).

3. The needle-stick-proof venous blood collection needle according to claim 2, characterized in that: A seal strip (5) is attached to the outer side of the wall of the needle tube outer tube (11) where the handle movable through groove (12) is provided, and the attaching position of the seal strip (5) is located at the front side of the handle (15) in the outward pushing direction.

4. The needle-stick-proof venous blood collection needle according to claim 3, characterized in that: The front end of the barrel of the needle tube outer barrel (11) is in a conical shape, and a needle plugging rubber pad (113) is connected to the top opening of the needle tube outer barrel (11).

5. The needle-stick-proof venous blood collection needle according to claim 1, characterized in that: The movable positioning slide bar (115) passes through the limiting block (18), and a slide bar positioning ring (117) is fixedly connected to the rod body. The limiting block (18) is provided with a through channel, and the inner wall of the through channel is provided with two groups of slide bar positioning grooves (116).

6. The needle-stick-proof venous blood collection needle according to claim 1, characterized in that: The ends of the C-shaped push plate (42) and the top plate (43) opposite to each other are each provided with a through slot (44), and the needle (17) movably passes through the through slot (44) provided on the C-shaped push plate (42) and the top plate (43).

7. The needle-stick-proof venous blood collection needle according to claim 1, characterized in that: An inner cavity (45) is provided in the body of the bending base (41), and the pushing unit is arranged in the inner cavity (45). The pushing unit comprises an inclined push block (46) and a bent push rod (47). The bent push rod (47) is fixedly connected to one end of the C-shaped push plate (42) located in the inner cavity (45), and the other end of the bent push rod (47) is against the inclined surface of the inclined push block (46). The vertical surface of the inclined push block (46) is placed on the inner wall of the inner cavity (45). The bottom end of the inclined push block (46) is fixedly connected to the pull rope (19), and one end of the C-shaped push plate (42) located in the inner cavity (45) is sleeved with an anti-slip rubber ring (48).

8. The needle-stick-proof venous blood collection needle according to claim 1, characterized in that: The docking end (3) comprises a docking outer tube (31) and a tube plugging needle (33); the bottom end of the tube plugging needle (33) is fixedly connected to the bottom of the docking outer tube (31), and the tube plugging needle (33) is connected to the catheter (2); the front end inner wall of the docking outer tube (31) is connected to a docking positioning block (37).

9. The needle-stick-proof venous blood collection needle according to claim 8, characterized in that: The inner wall of the docking outer tube (31) is provided with a limited inner concave wall (32), a pressure plate (35) is movably arranged in the limited inner concave wall (32), a pipe plugging needle sealing pad (36) is connected to the middle portion of the pressure plate (35), and a compression spring (34) is further arranged in the docking outer tube (31), the compression spring (34) abuts against the bottom of the pressure plate (35).

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