Extracorporeal membrane oxygenation cannula capable of preventing ineffective circulation

Abstract

The utility model discloses an invalid circulation prevention extracorporeal membrane oxygenation cannula which comprises a drainage tube body, and a blocking balloon assembly is arranged on the outer surface of the drainage tube body. The blocking balloon assembly comprises two blocking balloons, a connecting pipe is connected between the two blocking balloons, two communicating holes are formed in the connecting pipe and communicated with the two blocking balloons respectively, the safety of intubation is improved, meanwhile, it is effectively guaranteed that unoxygenated superior vena cava blood and unoxygenated inferior vena cava blood are drained to be oxygenated outside the body, and therefore the safety of intubation is improved. The function of preventing ineffective circulation through single-tube oxygenation is achieved, compared with traditional double-tube oxygenation, the situation that blood which is infused back just after oxygenation is repeatedly drained out of the body, and ineffective oxygenation is caused can be avoided, and the effectiveness of blood oxygenation is ensured.

Description

Technical Field

[0001] The utility model belongs to the technical field of extracorporeal membrane oxygenation equipment, in particular to an extracorporeal membrane oxygenation cannula for preventing ineffective circulation. Background Art

[0002] Venovenous extracorporeal membrane oxygenation is a method of draining venous blood from the body to the outside of the body, oxygenating it through a membrane oxygenator, and then perfusing the blood back into the body using a blood pump. It is mainly used clinically to support severe respiratory insufficiency and cardiac insufficiency. It can effectively carry out blood gas exchange and tissue perfusion, and can provide protective lung ventilation.

[0003] A Chinese patent discloses an extracorporeal membrane oxygenation cannula (CN215386373U) for transatrial septal percutaneous extracorporeal membrane oxygenation. The cannula comprises an insertion portion, a curved portion, a drainage outlet portion, and a connecting portion, which are connected in sequence. The portion of the drainage outlet portion near the curved portion serves as the inferior vena cava drainage portion. The insertion portion, curved portion, and inferior vena cava drainage portion are provided with multiple openings that are evenly distributed. The insertion portion, curved portion, drainage outlet portion, and connecting portion comprise translucent outer and inner layers. A superelastic reinforcing wire is provided between the outer and inner layers of the insertion portion, curved portion, and drainage outlet portion. A superelastic reinforcing ring is provided around the openings in the insertion portion, curved portion, and inferior vena cava drainage portion. A repositionable superelastic wire is provided between the outer and inner layers of the curved portion. This utility model has the advantages of being ultra-thin, having high mechanical strength, good flexibility, excellent blood drainage, and pressure relief for the left ventricle. Current venovenous oxygenation cannulas all utilize two cannulas, one from the jugular vein and the other from the femoral vein, to the atrial end of the superior and inferior vena cava, with the inferior vena cava usually used to draw blood out of the body, which is then returned to the superior vena cava after oxygenation. However, since the two cannulas are relatively close in the atrium, it is easy for the newly oxygenated blood to be drawn away, resulting in low blood oxygenation efficiency. Furthermore, most cannulas do not have a fixed mechanism, so they may move in the vein, thereby causing damage to the vein. Therefore, an anti-ineffective circulation extracorporeal membrane oxygenation cannula is provided for this purpose. Utility Model Content

[0004] The purpose of the utility model is to solve the problems that the current cannula may move and cause damage to the vein and the cannula distance is short and the oxygenation efficiency is low, and to propose an anti-ineffective circulation extracorporeal membrane oxygenation cannula.

[0005] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0006] An anti-ineffective circulation extracorporeal membrane oxygenation cannula comprises a drainage tube body, wherein the outer surface of the drainage tube body is provided with a blocking balloon component;

[0007] The blocking balloon assembly includes two blocking balloons, and a connecting tube is connected between the two blocking balloons. The connecting tube is provided with two communicating holes and is respectively connected with the two blocking balloons.

[0008] Furthermore, the outer surface of the drainage tube body is fixedly mounted with a first balloon and a second balloon, one end of the connecting tube passes through the first balloon and extends to the inside of the second balloon, and the two communicating holes are respectively located inside the first balloon and the second balloon.

[0009] Furthermore, a distal drainage hole and a proximal drainage hole are provided on the outer surface of the drainage tube body, the distal drainage hole is located above the second balloon, and the proximal drainage hole is located below the first balloon.

[0010] Furthermore, a blood return cavity side hole is provided on the outer surface of the drainage tube body, and the blood return cavity side hole (5) is located between the first balloon and the second balloon.

[0011] Furthermore, a partition wall is fixedly installed on the inner wall of the drainage tube body, and the partition wall divides the drainage tube body into a re-infusion cavity and a drainage cavity, wherein the re-infusion cavity is only connected to the side hole of the blood return cavity, and the drainage cavity is only connected to the distal drainage hole and the proximal drainage hole.

[0012] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0013] When the oxygenator is operating, blood from the superior vena cava and inferior vena cava is drawn into the drainage tube body through the distal and proximal drainage holes, respectively. The blood then flows through the drainage cavity into the oxygenator for oxygenation. The treated blood is then transferred to the return cavity, where it is then returned to the right atrium through the side holes of the return cavity. Because of the balloon, blood returning to the right atrium is not immediately drawn away by the oxygenator through the distal and proximal drainage holes. Instead, it flows back into the right atrium, significantly improving oxygenation and preventing ineffective oxygenation. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0015] Figure 2 Schematic diagram of the broken balloon assembly structure.

[0016] Figure 3 Schematic diagram of the cross-sectional structure of the drainage tube body.

[0017] Figure 4 This is a working state diagram of the utility model.

[0018] Legend:

[0019] 1. Drainage tube body; 2. Blocking balloon assembly; 21. Connecting tube; 22. Connecting hole; 23. First balloon; 24. Second balloon; 3. Distal drainage hole; 4. Proximal drainage hole; 5. Side hole of blood return cavity; 6. Partition wall; 7. Right atrium. DETAILED DESCRIPTION

[0020] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0021] See also Figure 1-4 The utility model provides a technical solution: an anti-ineffective circulation extracorporeal membrane oxygenation cannula, comprising a drainage tube body 1, two ends of which are provided with two groups of blocking balloon components 2.

[0022] Among them, the blocking balloon assembly 2 includes a first balloon 23 and a second balloon 24, and a connecting tube 21 is arranged between the two balloons. One end of the connecting tube 21 passes through the interior of the first balloon 23 and extends to the interior of the second balloon 24. The outer surface of the connecting tube 21 is provided with two connecting holes 22, and the two connecting holes 22 are respectively located inside the first balloon 23 and the second balloon 24. The outer surface of the drainage tube body 1 is provided with a distal drainage hole 3 and a proximal drainage hole 4. The distal drainage hole 3 is located above the second balloon 24, and the proximal drainage hole 4 is located below the first balloon 23.

[0023] The outer surface of the drainage tube body 1 is provided with a blood return cavity side hole 5, and the blood return cavity side hole 5 is located between the first balloon 23 and the second balloon 24. A partition wall 6 is fixedly installed on the inner wall of the drainage tube body 1, and the partition wall 6 divides the drainage tube body 1 into a re-infusion cavity and a drainage cavity along its axial direction, wherein the re-infusion cavity is only connected with the blood return cavity side hole 5, and the drainage cavity is only connected with the distal drainage hole 3 and the proximal drainage hole 4.

[0024] Its specific implementation is:

[0025] The end of the drainage tube body 1 without the balloon is connected to the oxygenator. The oxygenator generally has an inlet blood vessel and a return blood vessel, which are respectively connected to the drainage cavity and the return cavity of the drainage tube body 1. The other end of the drainage tube body 1 is inserted from the inferior vena cava at the thigh and extends to the right atrium 7. One end of the connecting tube 21 is connected to the matching threaded syringe, and physiological saline is injected into the first balloon 23 and the second balloon 24 through the connecting tube 21 through the syringe. As physiological saline is continuously injected, the volume of the first balloon 23 and the second balloon 24 will gradually increase, thereby fixing the drainage tube body 1 in the vein. At the same time, the first balloon 23 and the second balloon 24 separate the return blood cavity side hole 5 from the distal drainage hole 3, and the return blood cavity side hole 5 from the proximal drainage hole 4.

[0026] When the oxygenator is in operation, blood from the superior vena cava and inferior vena cava is drawn into the drainage tube body 1 through the distal drainage hole 3 and the proximal drainage hole 4, respectively. The blood then flows through the drainage cavity into the oxygenator for oxygenation. The treated blood is then transferred to the return cavity, where it is then returned to the right atrium 7 through the side hole 5 of the return cavity. Because of the presence of the balloon, blood returning to the right atrium 7 is not immediately drawn away by the oxygenator through the distal drainage hole 3 and the proximal drainage hole 4. Instead, it flows back into the right atrium, greatly improving the oxygenation effect and avoiding ineffective oxygenation.

[0027] The above is only a preferred specific implementation method of the present invention, but the protection scope of the present invention is not limited to this. Any technician familiar with the technical field within the technical scope disclosed by the present invention can make equivalent replacements or changes based on the technical solution and utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An anti-ineffective circulation extracorporeal membrane oxygenation cannula, comprising a drainage tube body (1), characterized in that: The outer surface of the drainage tube body (1) is provided with a blocking balloon assembly (2); The blocking balloon assembly (2) comprises two blocking balloons, a connecting tube (21) is connected between the two blocking balloons, and the connecting tube (21) is provided with two communicating holes (22) which are respectively connected to the two blocking balloons.

2. The anti-ineffective circulation extracorporeal membrane oxygenation cannula according to claim 1, characterized in that: A first balloon (23) and a second balloon (24) are fixedly mounted on the outer surface of the drainage tube body (1), one end of the connecting tube (21) passes through the first balloon (23) and extends to the interior of the second balloon (24), and the two communicating holes (22) are respectively located inside the first balloon (23) and the second balloon (24).

3. The anti-ineffective circulation extracorporeal membrane oxygenation cannula according to claim 1, characterized in that: The outer surface of the drainage tube body (1) is provided with a distal drainage hole (3) and a proximal drainage hole (4), wherein the distal drainage hole (3) is located above the second balloon (24), and the proximal drainage hole (4) is located below the first balloon (23).

4. The anti-ineffective circulation extracorporeal membrane oxygenation cannula according to claim 1, characterized in that: The outer surface of the drainage tube body (1) is provided with a blood return cavity side hole (5), and the blood return cavity side hole (5) is located between the first balloon (23) and the second balloon (24).

5. The anti-ineffective circulation extracorporeal membrane oxygenation cannula according to claim 1, characterized in that: A partition wall (6) is fixedly mounted on the inner wall of the drainage tube body (1), and the partition wall (6) divides the drainage tube body (1) into a return infusion cavity and a drainage cavity, wherein the return infusion cavity is only connected to the side hole (5) of the return blood cavity, and the drainage cavity is only connected to the distal drainage hole (3) and the proximal drainage hole (4).

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