Safety intravenous blood taking needle

Abstract

The application relates to a safe intravenous blood taking needle, which comprises a blood taking needle body connected with a liquid guide pipe, a protection mechanism arranged on the blood taking needle body and the liquid guide pipe, a supporting pipe for connecting the blood taking needle body and the liquid guide pipe, a fixed box movably connected with the supporting pipe, a push rod fixedly connected with the lower end of the supporting pipe and slidably arranged in a moving through hole, a fixed cylinder arranged on the lower end surface of the fixed box, a first supporting spring wound outside the supporting pipe and fixedly connected with the outer side wall of the supporting pipe and the inner bottom wall of the fixed box. The application improves the structure of the existing intravenous blood taking needle, and the improved intravenous blood taking needle can achieve the safe blood taking effect, so as to ensure the safe operation of the medical staff during the needle taking and needle removing processes.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, specifically to a safety venous blood collection needle. Background Technology

[0002] Venous blood collection is a common medical method used to test the normality of a patient's body fluids. Venous blood collection involves drawing a certain amount of venous blood through a needle to perform physiological and biochemical tests such as complete blood count, liver / kidney function tests, and hepatitis B surface antigen and antibody tests. The most widely used method is vacuum aspiration blood collection. This method relies on the pressure difference between the vacuum environment inside the collection tube and the body to allow blood to flow into the tube by gravity, requiring only a small amount of blood per test to achieve the desired results.

[0003] In venous blood collection, the most commonly used device is the lancet, which is used to puncture a vein to collect blood. During the process, the lancet is held and secured by the sterilized hands of medical personnel. Before puncture, the tip of the lancet is manually touched. After successful puncture, the distal end is secured with medical tape, and blood is collected by holding the needle. After blood collection, medical personnel still need to touch the lancet to remove it. This can easily injure medical personnel, and existing lancets lack sterilization equipment, making sterilization impossible. The lancets are then carelessly discarded after blood collection, posing a safety hazard. To address these problems, this invention proposes a safe venous blood collection lancet. Summary of the Invention

[0004] (1) Technical problems to be solved

[0005] The purpose of this invention is to overcome the shortcomings of the prior art, adapt to practical needs, and provide a safe intravenous blood collection needle to solve the above-mentioned technical problems.

[0006] (2) Technical solution

[0007] To achieve the objectives of this invention, the technical solution adopted is as follows:

[0008] A safety venous blood collection needle includes a blood collection needle body connected to a fluid guide tube. A protective mechanism is provided on the blood collection needle body and the fluid guide tube. The protective mechanism includes a support tube for connecting the blood collection needle body and the fluid guide tube, and a fixed box movably connected to the support tube. A push rod is fixedly connected to the lower end of the support tube and slidably disposed within a movable through hole. The movable through hole is opened on a fixed cylinder, which is fixedly disposed on the lower end face of the fixed box. A first support spring is wound around the support tube, and both ends of the first support spring are respectively fixedly connected to the outer wall of the support tube and the inner bottom wall of the fixed box.

[0009] Furthermore, the protective mechanism is equipped with a limiting mechanism to limit and lock the fixed box and the support tube.

[0010] Furthermore, the limiting mechanism includes a limiting rod and a first magnet block connected to one end of the limiting rod. The limiting rod is movably inserted into a moving groove, and the moving groove is opened on the support tube. The other end of the limiting rod is fixedly connected to one end of a guide support assembly, and the other end of the guide support assembly is fixedly connected to the side wall of the moving groove. The limiting mechanism also includes a limiting through hole opened on the fixed box and a second magnet block opposite to the limiting through hole. The second magnet block is fixedly connected to a support rod, and the support rod is fixedly connected to the outer side wall of the fixed box.

[0011] Furthermore, the guide support assembly includes a guide support rod, a guide support cylinder, and a guide support spring. The guide support rod is movably inserted into the guide support cylinder, and the guide support spring is wound around the outside of the guide support rod. The two ends of the guide support spring are respectively fixedly connected to the side wall of the guide support rod and the outer side wall of the guide support cylinder.

[0012] Furthermore, the limiting mechanism is provided with a pushing component.

[0013] Furthermore, the pushing assembly includes a first through hole opened on the second magnet block, a second through hole opened on the support rod, and a pushing rod movably inserted into the first through hole and the second through hole. A second support spring is wound around the outer side wall of the pushing rod, and the two ends of the second support spring are respectively fixedly connected to the side wall of the pushing rod and the side wall of the support rod.

[0014] Furthermore, the protective mechanism is equipped with a disinfection mechanism.

[0015] Furthermore, the disinfection mechanism includes a disinfectant storage tank fixedly installed on the outer wall of the fixed cylinder, and a trumpet-shaped spray hole opened on the connection side between the disinfectant storage tank and the fixed cylinder. The trumpet-shaped spray hole is used to connect the disinfectant storage tank and the fixed cylinder. A first connecting pipe is connected to the upper end of the disinfectant storage tank, and a second connecting pipe is connected to the other end of the first connecting pipe. The second connecting pipe is fixedly inserted into the fixed box and communicates with the inner cavity of the fixed box.

[0016] Furthermore, the protective mechanism is equipped with a sealing mechanism, which includes an elastic sealing plate fixedly mounted on the upper end face of the push rod. The elastic sealing plate is movably inserted into the mounting groove, which is located on the side wall of the fixed box and the support tube. A third support spring is wound around the elastic sealing plate, and the two ends of the third support spring are fixedly connected to the side wall of the elastic sealing plate and the side wall of the mounting groove, respectively. The push rod and the elastic sealing plate allow the fixed cylinder to be positioned above the push rod to form a pressurizing chamber, which is connected to the second connecting tube.

[0017] Furthermore, an anti-backflow mechanism is provided inside the second connecting pipe. The anti-backflow mechanism includes an anti-backflow baffle. One end of the anti-backflow baffle is hinged to the inner bottom wall of the second connecting pipe, and the other end of the anti-backflow baffle is tilted to the right and extends into the anti-backflow groove. The anti-backflow groove is opened on the inner top wall of the second connecting pipe. One end of a fourth support spring is fixedly connected to the side wall of the anti-backflow baffle, and the other end of the fourth support spring is fixedly connected to the inner bottom wall of the second connecting pipe.

[0018] (3) Beneficial effects:

[0019] This invention improves the structure of existing intravenous blood collection needles, and the improved intravenous blood collection needle can achieve a safe blood collection effect, thereby ensuring that medical personnel can operate safely during the needle handling and removal process.

[0020] The protective mechanism of this invention can conceal the blood collection needle body, thereby achieving safe use. Specifically, when the blood collection needle body needs to be used, the push rod is pushed downward in the movable through hole. The downward movement of the push rod will cause the blood collection needle body to extend out of the fixed cylinder for blood collection. After blood collection is completed, the push rod is released. Under the action of the first support spring, the push rod will reset and retract the blood collection needle body back into the fixed cylinder, thereby concealing the blood collection needle body and achieving safe use.

[0021] The limiting mechanism provided by this invention makes the use of the blood collection needle body more convenient and flexible. Specifically, when the support tube moves downward relative to the fixed box, it will move downward along with the combination of the limiting rod and the first magnet. As the movement continues, the combination structure will move to the position of the limiting through hole. Since the first magnet and the second magnet attract each other on their adjacent sides, under the action of the attraction, the first magnet will carry the limiting rod into the limiting through hole, thereby locking the current position of the fixed box and the support tube. At this time, the blood collection needle body is fully extended outside the fixed cylinder, and medical personnel can use the blood collection needle body to complete the blood collection process.

[0022] The pushing component of this invention is used to separate the first magnet block and the second magnet block to achieve intelligent retraction of the blood collection needle body. Specifically, after blood collection is completed, medical personnel only need to press the pushing rod lightly to make the pushing rod move to the left. During this movement, the first magnet block and the second magnet block will be pushed apart. As the first magnet block moves outside the limiting through hole, under the action of the first support spring, the support tube will carry the pushing rod and the blood collection needle body to perform an instantaneous reset movement. During this movement, the blood collection needle body can be quickly pulled out of the human body and enter the fixed cylinder.

[0023] The disinfection mechanism of this invention is used to disinfect the blood collection needle body during the process of retracting into the fixed cylinder. Specifically, the upward movement of the push rod will pressurize the pressurization chamber, and this pressurization process will act on the disinfectant storage tank through the second connecting pipe and the first connecting pipe, thereby spraying the disinfectant in the disinfectant storage tank out of the trumpet-shaped spray hole to disinfect the blood collection needle body during the retraction process.

[0024] The sealing mechanism provided in this invention is used to cooperate with the push rod to form a pressurizing chamber inside the fixed cylinder above the push rod, so that when the push rod is reset upward, the disinfectant storage tank can be pressurized.

[0025] The anti-backflow mechanism of this invention is used to block backflow pressure. Specifically, since the left side wall of the anti-backflow baffle is blocked by the left side wall of the anti-backflow groove, the anti-backflow baffle cannot continue to rotate to the left. Thus, during the downward movement of the push rod, the gas in the disinfectant storage tank cannot be extracted. Furthermore, the one-way valve on the fixed cylinder can inject gas into the pressurization chamber when the push rod moves downward. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of an embodiment of the safety venous blood collection needle of the present invention;

[0027] Figure 2 This invention relates to a safety-type intravenous blood collection needle. Figure 1 Enlarged schematic diagram of structure A in the middle;

[0028] Figure 3 This invention relates to a safety-type intravenous blood collection needle. Figure 1 Enlarged schematic diagram of the B-structure;

[0029] Figure 4 This is a schematic diagram of the disinfection mechanism in the safety intravenous blood collection needle of the present invention;

[0030] Figure 5 This invention relates to a safety-type intravenous blood collection needle. Figure 4 Enlarged schematic diagram of the C-structure.

[0031] The attached figures are labeled as follows:

[0032] Blood collection needle body 1, liquid guide tube 2, protective mechanism 3, fixed box 31, support tube 32, push rod 33, moving through hole 34, fixed cylinder 35, first support spring 36, limiting mechanism 4, limiting rod 41, first magnet block 42, moving groove 43, guide support assembly 44, guide support rod 441, guide support cylinder 442, guide support spring 443, limiting through hole 45, second magnet block 46, support rod 47, pushing assembly 5, push rod 51, second support spring 52, disinfection mechanism 6, disinfectant storage tank 61, trumpet-shaped spray hole 62, first connecting tube 63, second connecting tube 64, sealing mechanism 7, elastic sealing plate 71, mounting groove 72, third support spring 73, anti-backflow mechanism 8, anti-backflow baffle 81, anti-backflow groove 82, fourth support spring 83. Detailed Implementation

[0033] The following is in conjunction with the appendix Figure 1-5 The present invention is further illustrated by the embodiments:

[0034] A safe intravenous blood collection needle includes a blood collection needle body 1, which is connected to a fluid guide tube 2. A protective mechanism 3 is provided on both the blood collection needle body 1 and the fluid guide tube 2. The protective mechanism 3 includes a support tube 32 for connecting the blood collection needle body 1 and the fluid guide tube 2, and a fixed box 31 movably connected to the support tube 32. A push rod 33 is fixedly connected to the lower end of the support tube 32 and is slidably disposed within a movable through hole 34. The movable through hole 34 is opened on a fixed cylinder 35, which is fixedly disposed on the lower end face of the fixed box 31. A first support spring 36 is wound around the support tube 32, and both ends of the first support spring 36 are respectively fixedly connected to the outer side wall of the support tube 32 and the inner bottom wall of the fixed box 31. This invention improves the structure of existing intravenous blood collection needles, achieving a safe blood collection effect and ensuring safe operation for medical personnel during needle handling and removal.

[0035] The protective mechanism 3 provided in this invention can conceal the blood collection needle body 1, thereby achieving safe use. Specifically, when the blood collection needle body 1 needs to be used, the push rod 33 is pushed downward in the movable through hole 34. The downward movement of the push rod 33 will cause the blood collection needle body 1 to extend out of the fixed cylinder 35 for blood collection. After the blood collection is completed, the push rod 33 is released. Under the action of the first support spring 36, the push rod 33 will reset and retract the blood collection needle body 1 back into the fixed cylinder 35, thereby concealing the blood collection needle body 1 and achieving safe use.

[0036] In this embodiment, the protective mechanism 3 is provided with a limiting mechanism 4 to limit and lock the fixed box 31 and the support tube 32. The limiting mechanism 4 includes a limiting rod 41 and a first magnet block 42 connected to one end of the limiting rod 41. The limiting rod 41 is movably inserted into a moving groove 43, and the moving groove 43 is opened on the support tube 32. The other end of the limiting rod 41 is fixedly connected to one end of a guide support assembly 44, and the other end of the guide support assembly 44 is fixedly connected to the side wall of the moving groove 43. The limiting mechanism 4 also includes a limiting through hole 45 opened on the fixed box 31, and a second magnet block 46 opposite to the limiting through hole 45. The second magnet block 46 is fixedly connected to a support rod 47, and the support rod 47 is fixedly connected to... On the outer wall of the fixed box 31, the limiting mechanism 4 provided by the present invention makes the use of the blood collection needle body 1 more convenient and flexible. Specifically, when the support tube 32 moves downward relative to the fixed box 31, it will move downward with the combination of the limiting rod 41 and the first magnet 42. As the movement continues, the combination structure will move to the position of the limiting through hole 45. Since the first magnet 42 and the second magnet 46 are attracted to each other on the side that are close to each other, under the action of the attraction, the first magnet 42 will carry the limiting rod 41 into the limiting through hole 45, thereby locking the current position of the fixed box 31 and the support tube 32. At this time, the blood collection needle body 1 is completely extended outside the fixed cylinder 35, and medical personnel can use the blood collection needle body 1 to complete the blood collection process.

[0037] In this embodiment, the guide support assembly 44 includes a guide support rod 441, a guide support cylinder 442, and a guide support spring 443. The guide support rod 441 is movably inserted into the guide support cylinder 442, and the guide support spring 443 is wound around the outside of the guide support rod 441. The two ends of the guide support spring 443 are respectively fixedly connected to the side wall of the guide support rod 441 and the outer side wall of the guide support cylinder 442.

[0038] In this embodiment, the limiting mechanism 4 is provided with a pushing component 5. The pushing component 5 includes a first through hole in the second magnet block 46, a second through hole in the supporting rod 47, and a pushing rod 51 movably inserted into the first through hole and the second through hole. A second supporting spring 52 is wound around the outer wall of the pushing rod 51, and the two ends of the second supporting spring 52 are respectively fixedly connected to the side wall of the pushing rod 51 and the side wall of the supporting rod 47. The pushing component 5 provided in this invention is used to separate the first magnet block 46 and the second magnet block 47. The iron block 46 enables the intelligent retraction of the blood collection needle body 1. Specifically, after blood collection is completed, the medical staff only needs to press the push rod 51 lightly to make the push rod 51 move to the left. In this movement, the first magnet block 42 and the second magnet block 46 will be pushed away. As the first magnet block 42 moves to the outside of the limiting through hole 45, under the action of the first support spring 36, the support tube 32 will carry the push rod 33 and the blood collection needle body 1 to make an instantaneous reset movement. During this movement, the blood collection needle body 1 can be quickly pulled out of the human body and enter the fixed cylinder 35.

[0039] In this embodiment, the protective mechanism 3 is equipped with a disinfection mechanism 6. The disinfection mechanism 6 includes a disinfectant storage tank 61 fixedly mounted on the outer wall of the fixed cylinder 35, and a funnel-shaped spray hole 62 opened on the connection side between the disinfectant storage tank 61 and the fixed cylinder 35. The funnel-shaped spray hole 62 is used to connect the disinfectant storage tank 61 and the fixed cylinder 35. The upper end of the disinfectant storage tank 61 is connected to a first connecting pipe 63, and the other end of the first connecting pipe 63 is connected to a second connecting pipe 64. The second connecting pipe 64 is fixed. The second connecting pipe 64 is connected to the inner cavity of the fixed box 31. The disinfection mechanism 6 provided in this invention is used to disinfect the blood collection needle body 1 during the process of retracting into the fixed cylinder 35. Specifically, the upward movement of the push rod 33 will pressurize the pressurization chamber, and the pressurization process will act on the disinfectant storage tank 61 through the second connecting pipe 64 and the first connecting pipe 63, thereby spraying the disinfectant in the disinfectant storage tank 61 out from the trumpet-shaped spray hole 62 to disinfect the blood collection needle body 1 during the retraction process.

[0040] In this embodiment, the protective mechanism 3 is provided with a sealing mechanism 7. The sealing mechanism 7 includes an elastic sealing plate 71 fixedly disposed on the upper end face of the push rod 33. The elastic sealing plate 71 is movably inserted into the mounting groove 72, and the mounting groove 72 is opened on the side wall of the fixed box 31 and the support tube 32. A third support spring 73 is wound around the elastic sealing plate 71, and the two ends of the third support spring 73 are respectively fixedly connected to the side wall of the elastic sealing plate 71 and the side wall of the mounting groove 72. The push rod 33 and the elastic sealing plate 71 can make the fixed cylinder 35 located above the push rod 33 to form a pressurizing cavity, and the pressurizing cavity is connected to the second connecting tube 64. The sealing mechanism 7 provided in this invention is used to cooperate with the push rod 33 to form a pressurizing cavity in the fixed cylinder 35 located above the push rod 33, so that when the push rod 33 is reset upward, the disinfectant storage tank 61 can be pressurized.

[0041] In one embodiment, the fixed cylinder 35 is provided with a one-way valve to inject gas into the pressurization chamber when the push rod 33 moves downward.

[0042] In this embodiment, an anti-backflow mechanism 8 is provided inside the second connecting pipe 64. The anti-backflow mechanism 8 includes an anti-backflow baffle 81. One end of the anti-backflow baffle 81 is hinged to the inner bottom wall of the second connecting pipe 64, and the other end of the anti-backflow baffle 81 is inclined to the right and extends into the anti-backflow groove 82. The anti-backflow groove 82 is formed on the inner top wall of the second connecting pipe 64. One end of a fourth support spring 83 is fixedly connected to the side wall of the anti-backflow baffle 81, and the other end of the fourth support spring 83... Fixedly connected to the inner bottom wall of the second connecting pipe 64, the anti-backflow mechanism 8 of this invention is used to block backflow pressure. Specifically, since the left side wall of the anti-backflow baffle 81 is blocked by the left side wall of the anti-backflow groove 82, the anti-backflow baffle 81 cannot continue to rotate to the left. Thus, during the downward movement of the push rod 33, the gas in the disinfectant storage tank 61 cannot be extracted. Furthermore, the one-way valve on the fixed cylinder 35 can inject gas into the pressurization chamber when the push rod 33 moves downward.

[0043] Beneficial effects of this invention:

[0044] This invention improves the structure of existing intravenous blood collection needles, and the improved intravenous blood collection needle can achieve a safe blood collection effect, thereby ensuring that medical personnel can operate safely during the needle handling and removal process.

[0045] The protective mechanism 3 provided in this invention can conceal the blood collection needle body 1, thereby achieving safe use. Specifically, when the blood collection needle body 1 needs to be used, the push rod 33 is pushed downward in the movable through hole 34. The downward movement of the push rod 33 will cause the blood collection needle body 1 to extend out of the fixed cylinder 35 for blood collection. After the blood collection is completed, the push rod 33 is released. Under the action of the first support spring 36, the push rod 33 will reset and retract the blood collection needle body 1 back into the fixed cylinder 35, thereby concealing the blood collection needle body 1 and achieving safe use.

[0046] The limiting mechanism 4 provided in this invention makes the use of the blood collection needle body 1 more convenient and flexible. Specifically, when the support tube 32 moves downward relative to the fixed box 31, it will move downward along with the combination of the limiting rod 41 and the first magnet 42. As the movement continues, the combination structure will move to the position of the limiting through hole 45. Since the first magnet 42 and the second magnet 46 are attracted to each other on their close sides, under the action of the attraction, the first magnet 42 will carry the limiting rod 41 into the limiting through hole 45, thereby locking the current position of the fixed box 31 and the support tube 32. At this time, the blood collection needle body 1 extends completely outside the fixed cylinder 35, and medical personnel can use the blood collection needle body 1 to complete the blood collection process.

[0047] The pushing component 5 of this invention is used to separate the first magnet block 42 and the second magnet block 46 to achieve intelligent retraction of the blood collection needle body 1. Specifically, after blood collection is completed, the medical staff only needs to press the pushing rod 51 lightly to make the pushing rod 51 move to the left. In this movement, the first magnet block 42 and the second magnet block 46 will be pushed apart. As the first magnet block 42 moves to the outside of the limiting through hole 45, under the action of the first support spring 36, the support tube 32 will carry the pushing rod 33 and the blood collection needle body 1 to perform an instantaneous reset movement. During this movement, the blood collection needle body 1 can be quickly pulled out of the human body and enter the fixed cylinder 35.

[0048] The disinfection mechanism 6 provided in this invention is used to disinfect the blood collection needle body 1 during the process of retracting into the fixed cylinder 35. Specifically, the upward movement of the push rod 33 will pressurize the pressurization chamber, and this pressurization process will act on the disinfectant storage tank 61 through the second connecting pipe 64 and the first connecting pipe 63, thereby spraying the disinfectant in the disinfectant storage tank 61 out from the trumpet-shaped spray hole 62 to disinfect the blood collection needle body 1 during the retraction process.

[0049] The sealing mechanism 7 provided in this invention is used to cooperate with the push rod 33 to form a pressurizing chamber above the push rod 33 in the fixed cylinder 35, so that when the push rod 33 is reset upward, the disinfectant storage tank 61 can be pressurized.

[0050] The anti-backflow mechanism 8 provided in this invention is used to block backflow pressure. Specifically, since the left side wall of the anti-backflow baffle 81 is blocked by the left side wall of the anti-backflow groove 82, the anti-backflow baffle 81 cannot continue to rotate to the left. Thus, during the downward movement of the push rod 33, the gas in the disinfectant storage tank 61 cannot be extracted. Furthermore, the one-way valve provided on the fixed cylinder 35 can inject gas into the pressurization chamber when the push rod 33 moves downward.

[0051] The embodiments disclosed herein are preferred embodiments, but are not limited thereto. Those skilled in the art can readily grasp the spirit of the present invention based on the above embodiments and make different extensions and variations, but as long as they do not depart from the spirit of the present invention, they are all within the protection scope of the present invention.

Claims

1. A safety-type intravenous blood collection needle, comprising a blood collection needle body (1), characterized in that, The blood collection needle body (1) is connected to the liquid guide tube (2). The blood collection needle body (1) and the liquid guide tube (2) are provided with a protective mechanism (3). The protective mechanism (3) includes a support tube (32) for connecting the blood collection needle body (1) and the liquid guide tube (2), and a fixed box (31) for the support tube (32) to be movably inserted. A push rod (33) is fixedly connected to the lower end of the support tube (32), and the push rod (33) is slidably disposed in the movable through hole (34). The movable through hole (34) is opened on the fixed cylinder (35), and the fixed cylinder (35) is fixedly disposed on the lower end face of the fixed box (31). A first support spring (36) is wound around the support tube (32), and the two ends of the first support spring (36) are respectively fixedly connected to the outer side wall of the support tube (32) and the inner bottom wall of the fixed box (31). It also includes a disinfection mechanism (6) and a sealing mechanism (7); the disinfection mechanism (6) includes a disinfectant storage tank (61) fixedly installed on the side wall of the fixed cylinder (35), and a spray hole (62) opened on the connection side of the disinfectant storage tank (61) and the fixed cylinder (35). The spray hole (62) is used to connect the disinfectant storage tank (61) and the fixed cylinder (35). A first connecting pipe (63) is connected to the disinfectant storage tank (61), and a second connecting pipe (64) is connected to the other end of the first connecting pipe (63). The second connecting pipe (64) is fixedly inserted into the fixed box (31), and the second connecting pipe (64) is connected to the inner cavity of the fixed box (31). The sealing mechanism (7) includes an elastic sealing plate (71) fixedly disposed on the upper end face of the push rod (33), and a pressurization chamber is formed in the fixed cylinder (35) through the push rod (33) and the elastic sealing plate (71). The pressurization chamber is connected to the second connecting pipe (64) so ​​that when the push rod (33) is reset upward, the gas in the pressurization chamber drives the disinfectant in the disinfectant storage tank (61) to spray out from the spray hole (62). A one-way valve is provided on the fixed cylinder (35) to inject gas into the pressurization chamber when the push rod (33) moves downward. An anti-backflow mechanism (8) is provided in the second connecting pipe (64). The anti-backflow mechanism (8) includes an anti-backflow baffle (81). One end of the anti-backflow baffle (81) is hinged to the inner bottom wall of the second connecting pipe (64), and the other end of the anti-backflow baffle (81) is tilted to the right and extends into the anti-backflow groove (82). The anti-backflow baffle (82) is opened on the inner top wall of the second connecting pipe (64). The side wall of the anti-backflow baffle (81) is fixedly connected to one end of the fourth support spring (83), and the other end of the fourth support spring (83) is fixedly connected to the inner bottom wall of the second connecting pipe (64). The one-way valve cooperates with the anti-backflow mechanism (8) so that the gas can only flow into the disinfectant storage tank (61) in one direction from the pressurization chamber through the second connecting pipe (64) and the first connecting pipe (63).

2. The safety venous blood collection needle as described in claim 1, characterized in that: The protective mechanism (3) is provided with a limiting mechanism (4) to limit and lock the fixed box (31) and the support tube (32).

3. The safety venous blood collection needle as described in claim 2, characterized in that: The limiting mechanism (4) includes a limiting rod (41) and a first magnet block (42) connected to one end of the limiting rod (41). The limiting rod (41) is movably inserted into the moving groove (43), and the moving groove (43) is opened on the support tube (32). The other end of the limiting rod (41) is fixedly connected to one end of the guide support assembly (44), and the other end of the guide support assembly (44) is fixedly connected to the side wall of the moving groove (43). The limiting mechanism (4) also includes a limiting through hole (45) opened on the fixed box (31) and a second magnet block (46) opposite to the limiting through hole (45). The second magnet block (46) is fixedly connected to the support rod (47), and the support rod (47) is fixedly connected to the outer side wall of the fixed box (31).

4. The safety venous blood collection needle as described in claim 3, characterized in that: The guide support assembly (44) includes a guide support rod (441), a guide support cylinder (442), and a guide support spring (443). The guide support rod (441) is movably inserted into the guide support cylinder (442), and the guide support spring (443) is wound around the outside of the guide support rod (441). The two ends of the guide support spring (443) are respectively fixedly connected to the side wall of the guide support rod (441) and the outer side wall of the guide support cylinder (442).

5. The safety venous blood collection needle as described in claim 3, characterized in that: The limiting mechanism (4) is provided with a pushing component (5).

6. The safety venous blood collection needle as described in claim 5, characterized in that: The pushing assembly (5) includes a first through hole opened on the second magnet block (46), a second through hole opened on the support rod (47), and a pushing rod (51) movably inserted into the first through hole and the second through hole. A second support spring (52) is wound around the outer wall of the pushing rod (51), and the two ends of the second support spring (52) are respectively fixedly connected to the side wall of the pushing rod (51) and the side wall of the support rod (47).

7. The safety venous blood collection needle as described in claim 1, characterized in that: The spray nozzle (62) is trumpet-shaped.

8. The safety venous blood collection needle as described in claim 1, characterized in that: The elastic sealing plate (71) is movably inserted into the mounting groove (72), and the mounting groove (72) is opened on the side wall of the fixed box (31) and the support tube (32). The elastic sealing plate (71) is wrapped with a third support spring (73), and the two ends of the third support spring (73) are respectively fixedly connected to the side wall of the elastic sealing plate (71) and the side wall of the mounting groove (72).

Images