Disposable blood dialysis extracorporeal circulation return line

Abstract

The present application relates to the technical field of medical devices, in particular to a disposable blood dialysis extracorporeal circulation blood return line, comprising an arterial side blood line and a venous side blood line; one end of the arterial side blood line is connected with a dialyzer, and one end of the venous side blood line is connected with the dialyzer; the venous side blood line comprises a first venous blood line, a venous reservoir, a third venous blood line and a second venous blood line; a tee joint is arranged on the first venous blood line, and an inlet end of the second venous blood line is connected with the tee joint; the third venous blood line is provided with a connecting port for connecting an outlet end of the second venous blood line; a second filter screen is arranged between the tee joint and the second venous blood line. When a first venous reservoir filter screen is blocked, a bypass return line can be established through the second venous blood line, so that blood discarding is avoided, and blood loss of a patient is reduced.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, specifically a disposable extracorporeal circulation return blood vessel for hemodialysis. Background Technology

[0002] Hemodialysis is one of the important alternative therapies for patients with kidney failure. During hemodialysis, the patient's blood is drawn through extracorporeal circulation tubing into a dialyzer for purification, and then returned to the patient's body.

[0003] For patients with active bleeding, high-risk bleeding tendencies, or coagulation disorders, heparin-free dialysis is often used clinically. This means that no anticoagulants are used during dialysis to prevent or worsen bleeding. However, heparin-free dialysis or other reasons can easily lead to blood clotting in the extracorporeal circulation tubing, especially clotting of the filter in the venous chamber. Once the venous chamber filter is clogged, blood cannot be smoothly returned to the patient through the venous side tubing, ultimately forcing the discarding of blood from the extracorporeal circulation tubing (i.e., "blood disposal"), resulting in unnecessary blood loss for the patient.

[0004] Currently, existing disposable hemodialysis extracorporeal circulation tubing only has a single return pathway. Once the venous chamber filter becomes clogged, there is no other way to return blood to the body. In some clinical procedures, normal saline is attempted to be reinfused to assess the blockage, but this adds an extra layer of fluid load to the patient, affecting their weight and fluid balance.

[0005] Therefore, there is an urgent need to develop a new extracorporeal circulation return circuit that can effectively solve the problem of blood disposal when the venous pot is blocked, in order to overcome the shortcomings in current practical applications. Summary of the Invention

[0006] The purpose of this invention is to provide a disposable extracorporeal circulation return line for hemodialysis to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, the present invention provides the following technical solution:

[0008] A disposable extracorporeal circulation return circuit for hemodialysis includes an arterial blood circuit and a venous blood circuit. One end of the arterial blood circuit is connected to one end of the dialyzer, and one end of the venous blood circuit is connected to the other end of the dialyzer. The venous blood circuit includes a first venous blood circuit, a venous reservoir, a third venous blood circuit, and a second venous blood circuit. One end of the first venous blood circuit is connected to the dialyzer, and the other end is connected to the venous reservoir. The first venous blood circuit is also provided with a tee, and the inlet end of the second venous blood circuit is connected to the tee. The third venous blood circuit is provided with a connection port for connecting to the outlet end of the second venous blood circuit, and the third venous blood circuit is also connected to the other end of the venous reservoir. A first filter is provided inside the venous reservoir, and a second filter is provided between the tee and the second venous blood circuit.

[0009] As a further embodiment of the present invention: a safety clip 1 is provided on the first venous blood circuit tube, located between the three-way valve and the venous pot; a safety clip 2 is provided on the second venous blood circuit tube.

[0010] As a further embodiment of the present invention: the connection port is a positive pressure spiral connector valve provided on the venous blood circuit three, and is equipped with a detachable spiral cap two; the outlet end of the venous blood circuit two is provided with a spiral cap one that cooperates with the positive pressure spiral connector valve.

[0011] As a further aspect of the present invention, the length of the second venous blood circuit is 30-35cm.

[0012] As a further aspect of the present invention: the positive pressure spiral connector valve is positioned 2-3 cm away from the venous reservoir on the third venous blood circuit.

[0013] As a further embodiment of the present invention, a venous clamp is also provided on the venous blood flow tube three.

[0014] As a further aspect of the present invention: the arterial side blood circuit is provided with an infusion tube, an arterial clamp, an arterial pressure sensor, a liver sac tube and an arterial chamber in sequence, and the other end of the arterial chamber is connected to the dialyzer through a pipe.

[0015] Compared with the prior art, the beneficial effects of the present invention are:

[0016] 1. Reduce patient blood loss: When the filter in the venous reservoir becomes clogged, medical staff can switch the blood flow path to the second venous blood line, allowing the blood to bypass the clogged venous reservoir and be directly returned to the patient's body, thus avoiding forced blood disposal due to pipeline blockage and significantly reducing the patient's blood loss.

[0017] 2. Ensure the safety of reinfused blood: The second venous blood line is equipped with an independent filter screen, which can effectively filter out any tiny blood clots or other particles that may be present in the blood, ensuring that the blood reinfused through the second venous blood line is safe and reliable.

[0018] 3. Simple operation and reasonable structure: By setting up standardized interfaces such as three-way valves, safety clips and spiral connectors, medical staff can quickly switch the access when the blood pump is stopped. The operation is convenient and does not affect the continuity of dialysis treatment. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the extracorporeal circulation return blood vessel circuit for a single hemodialysis procedure.

[0020] Figure 2 This is a schematic diagram of the venous blood circuit in the extracorporeal circulation return line of a single hemodialysis procedure.

[0021] In the diagram: 1. Infusion tubing; 2. Arterial clamp; 3. Arterial barometer; 4. Hepatic sac tubing; 5. Arterial chamber; 6. Dialyzer; 7. Venous blood circuit tube one; 8. Filter two; 9. Venous blood circuit tube two; 10. Safety clamp one; 11. Safety clamp two; 12. T-connector; 13. Positive pressure screw connector valve; 14. Venous barometer; 15. Venous chamber; 16. Filter one; 17. Venous blood circuit tube three; 18. Venous clamp; 19. Screw cap one; 20. Screw cap two; 21. Arterial side blood circuit tube. Detailed Implementation

[0022] The technical solution of this application will be further described in detail below with reference to specific embodiments.

[0023] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0024] Please see Figure 1 and Figure 2 The present invention provides a disposable extracorporeal circulation return line for hemodialysis, comprising an arterial blood line 21 and a venous blood line 21.

[0025] The inlet end of the arterial blood flow tube 21 is used to connect to the patient's artery or arteriovenous fistula puncture needle. The tube contains, in sequence, an infusion tube 1, an arterial clamp 2, an arterial barometer 3, a hepatic sac tube 4, and an arterial chamber 5. The other end of the arterial chamber 5 is connected to the arterial inlet of the dialyzer 6 via a conduit.

[0026] The inlet end of the venous blood circuit is connected to the venous outlet of the dialyzer 6, and its outlet end is used for reinfusion into the patient's vein. Specifically, the venous blood circuit includes venous blood circuit one 7, venous reservoir 15, venous blood circuit three 17, and venous blood circuit two 9. A filter screen 16 is installed inside the venous reservoir 15. A venous pressure sensor 14 is installed on the venous reservoir 15, and a venous clamp 18 is installed on the venous blood circuit three 17.

[0027] A tee 12 is provided on the first venous blood supply tube 7. The inlet end of the second venous blood supply tube 9 is connected to one port of the tee 12. A filter screen 2 8 is provided at the connection between the second venous blood supply tube 9 and the tee 12.

[0028] A connection port is provided on the third venous blood circuit 17 (preferably about 2-3 cm away from the venous reservoir 15) for connecting to the outlet end of the second venous blood circuit 9. Preferably, this connection port is a positive pressure screw connector valve 13, equipped with a removable screw cap 20. Correspondingly, the outlet end of the second venous blood circuit 9 is provided with a screw cap 19 adapted to the positive pressure screw connector valve 13. During normal use, screw cap 19 and screw cap 20 respectively cover the outlet of the second venous blood circuit 9 and the positive pressure screw connector valve 13, maintaining a sterile state.

[0029] To facilitate control of blood flow direction, a safety clip 10 is installed on the venous blood circuit 7, between the tee 12 and the venous chamber 15. A safety clip 21 is installed on the venous blood circuit 9.

[0030] The length of the second venous blood circuit tube 9 should ideally be 30-35cm to ensure ease of operation and avoid redundant and messy tubing.

[0031] Usage scenarios and operating methods (taking a clogged vein reservoir filter as an example):

[0032] If an abnormally high venous pressure is observed during dialysis, and it is suspected that the filter 16 in the venous chamber 15 is blocked, preventing normal blood return.

[0033] Medical staff immediately turned off the blood pump, stopping the blood flow.

[0034] Immediately clamp the safety clip 10 to stop blood from continuing to flow into the blocked venous inlet 15.

[0035] Remove the screw cap 19 from the outlet end of the venous blood circuit tube 29, and remove the screw cap 20 from the positive pressure screw connector valve 13 on the venous blood circuit tube 37.

[0036] The outlet end of the second venous blood circuit tube 9 is tightly connected to the positive pressure spiral connector valve 13 through the spiral cap 19, forming a bypass return path that passes through the tee 12, the second venous blood circuit tube 9, and the third venous blood circuit tube 17 in sequence.

[0037] Open the safety clip 211 on the venous blood circuit tube 29.

[0038] Restart the blood pump.

[0039] After the blood flows out of the dialyzer 6, it reaches the three-way valve 12 through the venous blood circuit 17. Since the safety clamp 10 is closed, the blood then enters the venous blood circuit 29. After being filtered by the filter screen 28, it flows through the positive pressure spiral connector valve 13 into the venous blood circuit 37, and is finally safely reinfused into the patient's body.

[0040] This disposable extracorporeal circulation return line for hemodialysis successfully solves the problem of blood discarding caused by clogging of the venous chamber filter in existing technologies. It is simple to operate and safe and reliable.

[0041] The above are merely preferred embodiments of the present invention. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of the present invention, and these should also be considered within the scope of protection of the present invention. These will not affect the effectiveness of the implementation of the present invention or the practicality of the patent.

Claims

1. A disposable extracorporeal circulation return line for hemodialysis, comprising an arterial side blood circuit and a venous side blood circuit; one end of the arterial side blood circuit is connected to one end of a dialyzer, and one end of the venous side blood circuit is connected to the other end of the dialyzer; characterized in that, The venous blood circuit includes venous blood circuit one, a venous reservoir, venous blood circuit three, and venous blood circuit two; one end of venous blood circuit one is connected to the dialyzer, and the other end is connected to the venous reservoir. Venous blood circuit one is also provided with a T-junction, and the inlet end of venous blood circuit two is connected to the T-junction; venous blood circuit three is provided with a connection port for connecting to the outlet end of venous blood circuit two, and venous blood circuit three is also connected to the other end of the venous reservoir; a first filter screen is provided inside the venous reservoir, and a second filter screen is provided between the T-junction and venous blood circuit two.

2. The disposable hemodialysis extracorporeal circulation return line according to claim 1, characterized in that, A safety clip is provided on the first venous blood supply line, between the three-way valve and the venous pot; a safety clip is provided on the second venous blood supply line.

3. The disposable hemodialysis extracorporeal circulation return blood circuit according to claim 2, characterized in that, The connection port is a positive pressure spiral connector valve located on the venous blood circuit three, and is equipped with a detachable spiral cap two; the outlet end of the venous blood circuit two is provided with a spiral cap one that cooperates with the positive pressure spiral connector valve.

4. The disposable hemodialysis extracorporeal circulation return blood circuit according to claim 3, characterized in that, The length of the second venous blood supply line is 30-35cm.

5. The disposable hemodialysis extracorporeal circulation return line according to claim 1, characterized in that, The positive pressure spiral connector valve is positioned 2-3 cm away from the venous reservoir on the third venous blood circuit.

6. The disposable hemodialysis extracorporeal circulation return line according to claim 1, characterized in that, The venous blood supply line three is also equipped with a venous clamp.

7. The disposable hemodialysis extracorporeal circulation return line according to claim 1, characterized in that, The arterial side blood circuit is sequentially equipped with an infusion tube, an arterial clamp, an arterial pressure sensor, a liver sac tube, and an arterial chamber. The other end of the arterial chamber is connected to the dialyzer via a tube.

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