An arteriovenous fistula blood sampling connector

Abstract

The utility model belongs to the internal arteriovenous fistula blood sampling technical field, concretely relates to an internal arteriovenous fistula blood sampling connector, including base, the upper end fixedly connected with first joint for and internal arteriovenous fistula puncture needle intercommunication of base, the lower end fixedly connected with the connecting portion for and blood sampling tube intercommunication of base, the connecting portion includes the second joint fixedly connected in the lower end of base, the lower end fixedly connected with the needle head of first joint intercommunication of second joint. The utility model can simply and conveniently input the blood sample of internal arteriovenous fistula puncture needle extraction into the inside collection of blood sampling tube, and reduce the occurrence of needle stick injury phenomenon, and the process of collecting blood sample is closed operation, and air and blood pollution are less, and the rubber cap of blood sampling tube upper end does not need to be pulled out, reduces the phenomenon of internal anticoagulant of blood sampling tube accidental spatter, reduces the risk of blood clotting due to anticoagulant spatter.

Description

Technical Field

[0001] This utility model belongs to the field of arteriovenous fistula blood collection technology, specifically relating to an arteriovenous fistula blood collection connector. Background Technology

[0002] Hemodialysis patients need to have blood tests every 1 to 6 months to check for hepatitis B, hepatitis C, syphilis, HIV, complete blood count, kidney function, electrolytes, parathyroid hormone, and other indicators. Then, based on the test results and the patient's clinical symptoms and signs, the condition is comprehensively judged, and a personalized treatment prescription is formulated to improve the quality of dialysis and quality of life.

[0003] Currently, most dialysis units have two routine procedures for collecting blood from arteriovenous fistulas of hemodialysis patients.

[0004] Method 1 involves puncturing the arteriovenous fistula with a needle, then taking a syringe of appropriate capacity, removing the needle, and directly connecting the syringe barrel nipple to the end of the arteriovenous fistula puncture needle. Open the clamp on the arteriovenous fistula puncture needle, aspirate the required amount of blood, close the clamp, connect the syringe to the needle, remove the needle cap, insert the needle into the blood collection tube, and use the negative pressure of the blood collection tube to draw the blood sample into the tube.

[0005] Method 2 involves puncturing the arteriovenous fistula with a needle, then directly removing the cap from the blood collection tube (at this point, the blood collection tube is exposed to air, and the negative pressure in the blood collection tube disappears). The end of the arteriovenous fistula puncture needle is then directly aligned with the blood collection tube. The clamp is opened, and blood automatically flows into the blood collection tube due to pressure (at this point, the blood is exposed to air). Once the required blood volume is reached, the clamp is closed, and the cap of the blood collection tube is fastened tightly.

[0006] However, when using method 1, blood may leak out and cause contamination when connecting the end of the arteriovenous fistula puncture needle to the syringe nipple. There is a risk of needlestick injury when removing the syringe needle protective cap or when pulling out the needle after injecting blood into the blood collection tube.

[0007] When using method 2, removing the cap from the blood collection tube exposes it to the air, which may contaminate the blood sample. Allowing blood to flow directly into the blood collection tube exposes it to the air, which does not meet the requirements for sterility. In addition, some blood collection tubes contain anticoagulants, and removing the cap can easily cause the anticoagulant to drip, resulting in insufficient anticoagulant and blood clotting, making the test impossible.

[0008] Currently, there are no connectors specifically designed for blood collection from arteriovenous fistulas on the market. Therefore, this connector was invented to solve the problem of blood collection procedures for arteriovenous fistulas that meet clinical requirements. Utility Model Content

[0009] The purpose of this invention is to provide a blood collection connector for arteriovenous fistulas, which can easily and conveniently input blood samples drawn from arteriovenous fistula puncture needles into the blood collection tube for collection, reducing the occurrence of needlestick injuries. The blood collection process is a closed operation, with less air and blood contamination, and it does not require removing the rubber cap at the top of the blood collection tube, reducing the phenomenon of accidental spillage of anticoagulant inside the blood collection tube and reducing the risk of coagulation caused by anticoagulant spillage.

[0010] The specific technical solution adopted by this utility model is as follows:

[0011] An arteriovenous fistula (AVF) blood collection connector includes a base. The upper end of the base is fixedly connected to a first connector for communicating with an AVF puncture needle. The lower end of the base is fixedly connected to a connecting part for communicating with a blood collection tube. The connecting part includes a second connector fixedly connected to the lower end of the base. The lower end of the second connector is fixedly connected to a needle that communicates with the first connector. The outer side of the needle is provided with a protective rubber layer.

[0012] Furthermore, a needle holder located outside the needle tip and protective rubber is detachably installed on the outer side of the second connector.

[0013] Furthermore, a side block is fixedly connected to the outer side of the base, a slide rod is slidably connected to the base, a protective ring is fixedly connected to the end of the slide rod, and a first return spring is sleeved on the outer side of the slide rod between the side block and the protective ring.

[0014] Furthermore, a locking component adapted to the slide rod is fixedly connected to the base. The locking component includes a positioning block slidably connected to the base. A second return spring is fixedly connected between the positioning block and the base. An end plate is fixedly connected to the upper end of the slide rod. A positioning hole adapted to the positioning block is opened inside the end plate. The inner diameter of the positioning hole is larger than the outer diameter of the positioning block.

[0015] Furthermore, the end of the positioning block has a hemispherical structure.

[0016] The technical effects achieved by this utility model are as follows:

[0017] (1) The arteriovenous fistula blood collection connector of this utility model can easily and conveniently connect with the arteriovenous fistula puncture needle by setting the first connector, and can easily and conveniently connect with the blood collection tube by setting the connecting part. Thus, the blood sample drawn from the arteriovenous fistula puncture needle can be easily and conveniently entered into the blood collection tube for collection. The blood collection process is a closed operation with less air and blood pollution, which meets the requirements of sterility and infection control.

[0018] (2) The arteriovenous fistula blood collection connector of this utility model reduces the possibility of direct contact between the human body and the needle by placing the protective rubber on the outside of the needle, thereby reducing the occurrence of needlestick injuries. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure when used in Embodiment 1 of this utility model;

[0020] Figure 2 This is a schematic diagram of the initial structure in Embodiment 1 of this utility model;

[0021] Figure 3 This is an exploded structural diagram of Embodiment 1 of this utility model;

[0022] Figure 4 This is a schematic diagram of the structure after the needle holder is installed in Embodiment 1 of this utility model;

[0023] Figure 5 This is a schematic diagram of the protective ring structure in Embodiment 2 of this utility model;

[0024] Figure 6 This is a schematic diagram of the structure after the needle holder is installed in Embodiment 2 of this utility model;

[0025] Figure 7 This is a utility model Figure 5 Enlarged section view of part A in the middle.

[0026] The attached diagram lists the components represented by each number as follows:

[0027] 1. Base; 2. First connector; 3. Second connector; 4. Arteriovenous fistula puncture needle; 5. Blood collection tube; 6. Needle holder; 7. First protective cap; 8. Needle; 9. Protective rubber; 10. Side block; 11. Slide rod; 12. Protective ring; 13. First return spring; 14. Guide rail; 15. Slide frame; 16. Positioning block; 17. Second return spring; 18. End plate; 19. Positioning hole; 20. Second protective cap. Detailed Implementation

[0028] To make the objectives and advantages of this utility model clearer, the following detailed description is provided in conjunction with embodiments. It should be understood that the following text is merely used to describe one or more specific embodiments of this utility model and does not strictly limit the scope of protection specifically claimed by this utility model. Example 1

[0029] like Figures 1-4 As shown, an arteriovenous fistula blood collection connector includes a base 1. The periphery of the base 1 is provided with anti-slip texture to increase friction and facilitate hand-twisting rotation.

[0030] The upper end of the base 1 is fixedly connected to a first connector 2 for communicating with the arteriovenous fistula puncture needle 4. The connection method can be threaded connection or sleeve connection, preferably threaded connection, that is, the outer side of the first connector 2 is provided with external thread, which is connected to the internal thread of the arteriovenous fistula puncture needle 4. The connection method is simple and convenient, with good stability and sealing, reducing blood leakage during operation and reducing blood contamination.

[0031] The lower end of the base 1 is fixedly connected to a connecting part for communicating with the blood collection tube 5. When the arteriovenous fistula puncture needle 4 and the blood collection tube 5 are both connected to the base 1, the blood sample drawn by the arteriovenous fistula puncture needle 4 can enter the blood collection tube 5 for collection. The blood sample collection process is a closed operation with less air and blood contamination, which meets the requirements of sterility and infection control.

[0032] The total length of the base 1, the first connector 2, and the connecting part is preferably 5 cm, which is compact, easy to operate, and low in cost.

[0033] like Figure 3 As shown, the connecting part includes a second connector 3 fixedly connected to the lower end of the base 1. The lower end of the second connector 3 is fixedly connected to a needle 8 that communicates with the first connector 2. The needle 8 can be directly inserted into the blood collection tube 5. The operation is simple and convenient, and there is no need to pull out the rubber cap at the upper end of the blood collection tube 5, which reduces the phenomenon of accidental dripping of anticoagulant inside the blood collection tube 5 and reduces the risk of blood clotting caused by anticoagulant dripping.

[0034] A protective rubber 9 is provided on the outside of the needle 8. The protective rubber 9 can reduce the direct contact between the human body and the needle 8, and reduce the occurrence of needlestick injuries. During the process of inserting the needle 8 into the blood collection tube 5, the needle 8 directly pierces into the inside of the blood collection tube 5. The protective rubber 9 is resisted and moves upward on the outside of the needle 8. At this time, the needle 8 passes through the protective rubber 9 and pierces into the inside of the blood collection tube 5.

[0035] like Figures 1-3 As shown, in order to protect the first connector 2 and the connecting part during storage, a first protective cap 7 is detachably installed on the upper end of the base 1, covering the outside of the first connector 2. The color of the first protective cap 7 is preferably white. A second protective cap 20 is detachably installed on the lower end of the base 1, covering the outside of the connecting part. The material of the second protective cap 20 is preferably transparent. The first protective cap 7 and the second protective cap 20 can be installed by magnetic attraction, snap-fit, sleeve or threaded connection. In this technical solution, threaded connection is preferred, which is convenient to rotate and unscrew or install, the operation is relatively simple, and it is relatively stable after installation.

[0036] Meanwhile, a needle holder 6 can be detachably installed on the outside of the second connector 3, located outside the needle 8 and the protective rubber 9. After the second protective cap 20 is removed, the needle holder 6 is installed on the second connector 3. Then, by holding the needle holder 6, the assembly of the base 1, the first connector 2, and the connecting part can be moved. By setting the needle holder 6, the possibility of direct contact between the human body and the needle 8 can be reduced, further reducing the occurrence of needlestick injuries.

[0037] Here, the needle holder 6 includes a hollow cylindrical structure with one end open. A threaded connector is fixedly connected to the upper end of the hollow cylindrical structure. The hollow cylindrical structure and the second connector 3 can be threaded together through the threaded connector. The hollow cylindrical structure is preferably transparent to facilitate the user's observation of the needle 8 and the protective rubber 9. At this time, the hollow cylindrical structure acts as a protective cover structure covering the outside of the needle 8 and the protective rubber 9, which can reduce the possibility of direct contact between the human body and the needle 8, and further reduce the occurrence of needlestick injuries. Example 2

[0038] like Figures 5-7 As shown, in order to further reduce the occurrence of needlestick injuries, this embodiment further improves the arteriovenous fistula blood collection connector based on the first embodiment. Specifically, a side block 10 is fixedly connected to the outside of the base 1, a slide rod 11 is slidably connected to the base 1, a protective ring 12 is fixedly connected to the end of the slide rod 11, and a first return spring 13 is sleeved on the outside of the slide rod 11 between the side block 10 and the protective ring 12. Initially, the protective ring 12 is located at the end of the needle 8 away from the base 1 under the elastic thrust of the first return spring 13, thereby reducing the possibility of contact between the human body and the end of the needle 8. The inner diameter of the protective ring 12 is larger than the outer diameter of the protective rubber 9.

[0039] Before the needle holder 6 is installed, the protective ring 12 is used to prevent puncture wounds.

[0040] During the assembly of the needle holder 6, the needle holder 6 applies an upward pushing force to the protective ring 12. After the needle holder 6 is installed, it provides protection against puncture wounds.

[0041] After blood collection is completed, the needle holder 6 is removed, and the protective ring 12 automatically resets under the elastic action of the first return spring 13. At this time, the protective ring 12 provides protection against puncture wounds again.

[0042] Meanwhile, in order to reduce the elasticity requirement of the first return spring 13, the protective ring 12 is locked in the initial state. A locking component adapted to the slide rod 11 is also fixedly connected to the base 1. The locking component includes a positioning block 16 slidably connected to the base 1. A second return spring 17 is fixedly connected between the positioning block 16 and the base 1. The elasticity of the second return spring 17 can drive the positioning block 16 to move away from the base 1. An end plate 18 is fixedly connected to the upper end of the slide rod 11. The end plate 18 has a positioning hole 19 adapted to the positioning block 16. The inner diameter of the positioning hole 19 is larger than the outer diameter of the positioning block 16. When the positioning block 16 is inserted into the positioning hole 19, the slide rod 11 and the protective ring 12 can be limited. When the positioning block 16 is moved out of the positioning hole 19, the slide rod 11 can be unlocked and the slide rod 11 can slide freely. The cooperation between the positioning block 16 and the positioning hole 19 can only lock the protective ring 12 in the initial state, and has little impact on the automatic reset action of the protective ring 12.

[0043] Furthermore, in order to more easily lock the protective ring 12 after automatic reset, the end of the positioning block 16 is a hemispherical structure, which makes it easier for the positioning block 16 to enter the positioning hole 19.

[0044] like Figure 7 As shown, a guide rail 14 is fixedly connected to the outer side of the base 1, and a slide 15 is slidably connected inside the guide rail 14. The positioning block 16 is fixedly connected to the slide 15, and the positioning block 16 can be stably guided by the slide 15.

[0045] The above description is merely a preferred embodiment of this utility model. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of this utility model, and these improvements and modifications should also be considered within the scope of protection of this utility model. Structures, devices, and operating methods not specifically described or explained in this utility model, unless otherwise specified or limited, shall be implemented using conventional methods in the field.

Claims

1. A blood collection connector for arteriovenous fistulas, characterized in that: Includes a base (1), the upper end of which is fixedly connected to a first connector (2) for communicating with an arteriovenous fistula puncture needle (4), the lower end of which is fixedly connected to a connecting part for communicating with a blood collection tube (5), the connecting part including a second connector (3) fixedly connected to the lower end of the base (1), the lower end of the second connector (3) being fixedly connected to a needle (8) communicating with the first connector (2), and a protective rubber (9) being provided on the outside of the needle (8).

2. The arteriovenous fistula blood collection connector according to claim 1, characterized in that: The upper end of the base (1) is detachably fitted with a first protective cap (7) covering the outside of the first connector (2), and the lower end of the base (1) is detachably fitted with a second protective cap (20) covering the outside of the connecting part.

3. The arteriovenous fistula blood collection connector according to claim 1, characterized in that: The second connector (3) is detachably mounted with a needle holder (6) located outside the needle (8) and the protective rubber (9).

4. The arteriovenous fistula blood collection connector according to claim 3, characterized in that: A side block (10) is fixedly connected to the outside of the base (1), and a slide rod (11) is slidably connected to the base (1). A protective ring (12) is fixedly connected to the end of the slide rod (11), and a first return spring (13) is sleeved on the outside of the slide rod (11) between the side block (10) and the protective ring (12).

5. The arteriovenous fistula blood collection connector according to claim 4, characterized in that: The base (1) is also fixedly connected with a locking component that is compatible with the slide rod (11). The locking component includes a positioning block (16) that is slidably connected to the base (1). A second return spring (17) is fixedly connected between the positioning block (16) and the base (1). An end plate (18) is fixedly connected to the upper end of the slide rod (11). The end plate (18) has a positioning hole (19) that is compatible with the positioning block (16). The inner diameter of the positioning hole (19) is larger than the outer diameter of the positioning block (16).

6. The arteriovenous fistula blood collection connector according to claim 5, characterized in that: The end of the positioning block (16) is a hemispherical structure.

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