Segmented anticoagulation communication tube for CRRT extracorporeal circulation line

Abstract

The utility model discloses a kind of segmented anticoagulation communication pipe for CRRT extracorporeal circulation pipeline, including connecting pipe, filter connecting port, venous end connecting port, blood sampling interface, access pipe and exhaust pipe;The filter connecting port and venous end connecting port are respectively fixedly connected with the both ends of the connecting pipe;Blood sampling interface, access pipe and exhaust pipe are installed on the connecting pipe from left to right;The utility model is installed at the filter outlet of extracorporeal circulation pipeline, and anticoagulant is accessed by access pipe, so that anticoagulant is fully mixed with blood before venous jug, can reduce thrombosis in venous jug, avoid the risk that extracorporeal circulation pipeline is blocked, ensure the continuity and stability of CRRT treatment, blood sampling interface is convenient for medical staff to carry out blood sample collection for detection, overall structure is simple, convenient to operate.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, specifically to a segmented anticoagulation connecting tube for CRRT extracorporeal circulation tubing. Background Technology

[0002] Continuous renal replacement therapy (CRRT) is a blood purification technique used to treat critically ill patients. It maintains homeostasis by continuously and slowly removing metabolic waste, excess fluid, and toxins from the body. The main working principle involves introducing the patient's blood into a special device (such as a blood filter) via extracorporeal circulation. Using a semi-permeable membrane, small molecules (such as urea, creatinine, and electrolytes) and excess fluid pass through the membrane into the replacement fluid, while large molecules (such as proteins and cells) remain in the blood. The purified blood is then returned to the patient.

[0003] In clinical practice of continuous renal replacement therapy (CRRT), the patency of the extracorporeal circulation tubing is a key factor in ensuring the smooth progress of treatment. However, thrombosis in the venous chamber is a common clinical problem, often leading to venous chamber blockage and forcing the interruption of CRRT, severely impacting patient efficacy and prognosis. Current segmented anticoagulation methods using sodium citrate anticoagulants involve inserting the anticoagulant at the venous chamber, where it provides enhanced anticoagulation. However, the anticoagulant requires sufficient time and distance to mix thoroughly with the blood to achieve optimal anticoagulation. Directly inserting the anticoagulant into the venous chamber prevents sufficient mixing, thus reducing its anticoagulant effect. However, current extracorporeal circulation tubing lacks an inlet after the filter and before the venous chamber, forcing the anticoagulant to be inserted before the chamber. Therefore, the effectiveness of segmented anticoagulation methods using sodium citrate anticoagulants is limited. Utility Model Content

[0004] The purpose of this invention is to provide a segmented anticoagulation connecting tube for CRRT extracorporeal circulation tubing that effectively improves anticoagulation effect, has a simple structure, and is easy to operate, in order to solve the technical problem that the anticoagulation effect is limited and the thrombosis in the venous chamber is not effectively prevented due to the direct connection of anticoagulant to the venous chamber in the existing extracorporeal circulation tubing.

[0005] To solve the above technical problems, the solution adopted by this utility model is as follows: A segmented anticoagulant connecting tube for CRRT extracorporeal circulation tubing includes a connecting tube, a filter connection port, a venous end connection port, a blood collection interface, an inlet tube, and an exhaust tube. The filter connection port and the venous end connection port are fixedly connected to both ends of the connecting tube, respectively. The blood collection interface, inlet tube, and exhaust tube are installed on the connecting tube from left to right. The filter connection port is connected to the filter outlet, and the venous end connection port is connected to the blood inlet at the venous end of the hemodialysis tubing. After blood is filtered and purified by the filter, it flows into the connecting tube through the filter connection port. Anticoagulant is introduced through the inlet tube, and the blood, thoroughly mixed with the anticoagulant, flows into the venous chamber through the blood inlet at the venous end of the hemodialysis tubing. The connecting tube is located before the venous chamber, ensuring that the anticoagulant is fully mixed with the blood before flowing into the venous chamber, which improves the anticoagulant effect of sodium citrate anticoagulant, effectively prevents thrombosis in the venous chamber, and ensures the continuity and stability of CRRT treatment. During pre-filling and venting, connect the filter port to the venous end port to form a closed tubing. Introduce saline solution through the inlet, allowing the gas in the tubing to be expelled through the venting pipe.

[0006] Furthermore, the outer side of the filter connection port is threaded; the inner side of the vein end connection port is threaded to match the thread of the filter connection port. The connecting tube connects the two ends through the outer thread of the filter connection port and the inner thread of the filter connection port, which facilitates storage and allows the inside of the connecting tube to be sealed, ensuring internal sterility.

[0007] Furthermore, the connecting tube includes connecting tube A, connecting tube B, a three-way connector, and connecting tube C; two three-way connectors are provided; connecting tubes A, B, and C are connected sequentially through their two ends; the inlet tube and vent tube are connected sequentially from left to right to the third ends of the two three-way connectors; the blood collection port is located in the middle of connecting tube A. Blood enters connecting tube A from the filter connection port, passes through the blood collection port in the middle of connecting tube A, facilitating blood sample collection and testing by medical personnel. When the blood flows to the three-way connector connected to the inlet tube, the anticoagulant flows from the inlet tube into the three-way connector and mixes with the blood, ensuring uniform distribution of the anticoagulant. The blood mixed with the anticoagulant is then output into the extracorporeal circulation venous circuit through connecting tubes B, C, and the venous end connection port.

[0008] Furthermore, the inlet tube and the outlet tube are equipped with a flow-stop clamp A; the connecting tube B is equipped with a flow-stop clamp B. The flow-stop clamp A on the inlet tube can be used to close the inlet tube when anticoagulant injection is not required or when anticoagulant injection needs to be paused; when the connecting tube is pre-filled and vented with saline, the filter connection port is connected to the venous end connection port to form a closed circuit, and the flow-stop clamp B is closed, while the flow-stop clamps A on the inlet tube and the outlet tube are opened, allowing saline to be injected into the connecting tube through the inlet tube, and air to be expelled from the outlet tube.

[0009] Furthermore, the blood collection interface is made of an elastic diaphragm. Under normal conditions, the elastic diaphragm keeps the blood closed, preventing contact between the blood and the external environment, thus avoiding contamination and blood leakage. When blood collection is needed, medical personnel can use a lancet to puncture the diaphragm to collect blood. After collection, the lancet is removed, and the diaphragm automatically springs back and seals the puncture site, preventing further blood leakage.

[0010] The working principle of this utility model is as follows: In use, connect the filter port to the filter outlet and the venous end port to the blood inlet of the hemodialysis tubing. Connect the anticoagulant to the inlet tube. After the blood is filtered and purified by the filter, it flows through the filter port into connecting tube A. The blood mixes with the anticoagulant at the T-junction of the inlet tube and then flows out from the venous end port into the venous chamber. For blood collection, insert the lancet through the blood collection interface made of an elastic diaphragm. After collection, remove the lancet; the diaphragm automatically springs back and seals the needle hole, effectively preventing further blood leakage. In addition, during hemodialysis treatment, the anticoagulation regimen is usually adjusted, and a segmented anticoagulation method is added. Before connecting the connecting tube to the hemodialysis line, the connecting tube needs to be pre-filled and vented. The filter connection port is connected to the venous connection port to form a closed line, and the stop clamp B is closed. The stop clamp A of the access tube and the vent tube is opened. Normal saline is injected into the connecting tube through the access tube to fill the connecting tube with normal saline. Air is vented through the vent tube. After the pre-filling and venting are completed, the connecting tube can be connected to the extracorporeal circulation line for use.

[0011] The beneficial effects of this utility model are as follows: 1. This utility model is installed at the filter outlet of the extracorporeal circulation pipeline. The anticoagulant is connected through the inlet tube, which can ensure that the anticoagulant is fully mixed with the blood before the venous chamber, so as to play an anticoagulant role. It can effectively prevent the formation of thrombus in the venous chamber, avoid the risk of blockage of the extracorporeal circulation pipeline, and ensure the continuity and stability of CRRT treatment. The blood collection interface makes it convenient for medical staff to collect blood samples for testing. The overall structure is simple and easy to operate.

[0012] 2. The flow stop clamp A of this utility model can be opened when needed to allow the anticoagulant to be injected; the blood collection interface adopts an elastic diaphragm design, which can be used for repeated blood collection operations and effectively avoids blood leakage and contamination, ensuring the reliability and accuracy of the blood collection process; the flow stop clamp B is closed when the connecting tube is pre-filled and vented, and is opened when the connecting tube is connected to the extracorporeal circulation pipeline. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the main structure of this utility model; Figure 2 This is a schematic diagram of the connection structure between the filter connection port and the vein end connection port of this utility model.

[0014] In the diagram: 1. Connecting tube; 11. Connecting tube A; 12. Connecting tube B; 121. Stop clamp B; 13. T-connector; 14. Connecting tube C; 2. Filter connection port; 3. Vein end connection port; 4. Blood collection interface; 5. Inlet tube; 51. Stop clamp A; 6. Exhaust tube. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0016] The following is a detailed description of a segmented anticoagulation connecting pipe for CRRT extracorporeal circulation tubing according to the present invention, with reference to the accompanying drawings: Example 1

[0017] A segmented anticoagulation connecting tube for CRRT extracorporeal circulation tubing includes a connecting tube 1, a filter connection port 2, a venous end connection port 3, a blood collection interface 4, an inlet tube 5, and an exhaust tube 6; the filter connection port 2 and the venous end connection port 3 are respectively fixedly connected to the two ends of the connecting tube 1; the blood collection interface 4, the inlet tube 5, and the exhaust tube 6 are installed on the connecting tube 1 from left to right; the blood collection interface 4 is made of an elastic diaphragm.

[0018] The working principle of this embodiment is as follows: In use, connect filter connection port 2 to filter outlet and venous end connection port 3 to blood inlet of the venous end of hemodialysis tubing. After blood is filtered and purified by the filter, it flows into connecting tube 1 through filter connection port 2. Anticoagulant is introduced through inlet tube 5. Blood mixed evenly with anticoagulant flows out of connecting tube 1 through venous end connection port 3 and enters the venous chamber through the venous end of hemodialysis tubing. Connecting tube 1 and inlet tube 5 ensure that the anticoagulant and blood are fully mixed before flowing into the venous chamber, which can effectively prevent thrombosis in the venous chamber. When performing blood collection, the blood collection needle is passed through the blood collection interface 4 made of elastic diaphragm to collect blood. After collection, the blood collection needle is pulled out and the diaphragm automatically rebounds and seals the needle hole. When a new connecting tube is connected for segmented anticoagulation and pre-filling and venting are required, connect filter connection port 2 to venous end connection port 3 to form a closed tubing. Physiological saline is introduced through inlet tube 5, so that the gas in the connecting tube is discharged from vent tube 6. Example 2

[0019] The difference from Embodiment 1 is that the filter connection port 2 has a thread on the outside; the venous end connection port 3 has a thread on the inside that matches the thread of the filter connection port 2; the connecting tube 1 includes a connecting tube A11, a connecting tube B12, a three-way tube 13 and a connecting tube C14; there are two three-way tubes 13; the connecting tubes A11, B12 and C14 are connected sequentially through the two ends of the three-way tubes 13; the inlet tube 5 and the vent tube 6 are connected sequentially from left to right to the third ends of the two three-way tubes 13; the blood collection interface 4 is located in the middle of the connecting tube A11; the inlet tube 5 and the vent tube 6 are provided with a flow stop clamp A51; the middle of the connecting tube B12 is provided with a flow stop clamp B121.

[0020] Open the connecting tube 1, which forms a ring by connecting the outer thread of the filter port 2 and the inner thread of the venous end port 3. After connecting it to the filter outlet and the venous end of the hemodialysis tubing, the filtered and purified blood flows through the filter port 2 into the connecting tube A11. It mixes with the anticoagulant at the tee tube 13 of the inlet tube 5 and the connecting tube B12, and then is delivered through the connecting tubes B12 and C14 to the venous end port 3. Finally, it is output through the venous end port 3 to the blood inlet of the venous end of the hemodialysis tubing and returned to the patient. When the anticoagulant infusion is paused, the blood is then... Closing clamp A51 closes inlet tube 5 to prevent anticoagulant from flowing into connecting tube 1. When segmented anticoagulation is required, connect filter connection port 2 to venous end connection port 3 to form a closed circuit. Open clamp A51 on inlet tube 5 and venting pipe 6 of connecting tube 1, close clamp 121 on connecting tube B12, and inject saline into connecting tube 1 through inlet tube 5 to fill connecting tube 1 with saline. Empty the tube through venting pipe 6. After emptying, connect filter connection port 2 and venous end connection port 3 of the device separately to the extracorporeal circulation line for use.

[0021] The working principle of this embodiment is the same as that of Embodiment 1.

[0022] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. The present utility model, through optimized pipeline design, achieves thorough mixing of the anticoagulant with the blood before the venous chamber, ensuring that the anticoagulant can effectively prevent thrombosis in the venous chamber, reducing the risk of pipeline blockage caused by coagulation, and ensuring the continuity and stability of CRRT treatment. For those skilled in the art, modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A segmented anticoagulation connecting pipe for CRRT extracorporeal circulation tubing, characterized in that: It includes a connecting tube (1), a filter connection port (2), a vein end connection port (3), a blood collection interface (4), an access tube (5), and an exhaust pipe (6); the filter connection port (2) and the vein end connection port (3) are fixedly connected to the two ends of the connecting tube (1), respectively; the blood collection interface (4), the access tube (5), and the exhaust pipe (6) are installed on the connecting tube (1) from left to right.

2. A segmented anticoagulation connecting pipe for CRRT extracorporeal circulation tubing according to claim 1, characterized in that: The filter connection port (2) has a thread on the outside; the vein end connection port (3) has a thread on the inside that matches the thread of the filter connection port (2).

3. A segmented anticoagulation connecting pipe for CRRT extracorporeal circulation tubing according to claim 1, characterized in that: The connecting tube (1) includes connecting tube A (11), connecting tube B (12), tee tube (13) and connecting tube C (14); there are two tee tubes (13); connecting tube A (11), connecting tube B (12) and connecting tube C (14) are connected sequentially through the two ends of the tee tube (13); the inlet tube (5) and the exhaust tube (6) are connected sequentially from left to right to the third ends of the two tee tubes (13); the blood collection interface (4) is located in the middle of the connecting tube A (11).

4. A segmented anticoagulation connecting pipe for CRRT extracorporeal circulation tubing according to claim 3, characterized in that: The inlet pipe (5) and the outlet pipe (6) are provided with a flow stop clamp A (51); the middle part of the connecting pipe B (12) is provided with a flow stop clamp B (121).

5. A segmented anticoagulation connecting pipe for CRRT extracorporeal circulation tubing according to claim 3, characterized in that: The blood collection interface (4) is made of an elastic diaphragm.

Images