Anti-backflow and thrombus self-cleaning mechanical valve structure for hemodialysis catheter

Abstract

The invention relates to the technical field of hemodialysis, and discloses a hemodialysis anti-backflow mechanical valve structure which comprises a valve body, the valve body comprises a first valve shell and a second valve shell, the first valve shell is in threaded connection with the inner wall of the first valve shell, a duckbill valve is arranged on the inner side of the second valve shell, a containing groove is formed in the surface of the second valve shell, and the duckbill valve can be inserted into the containing groove; according to the invention, the valve body is arranged, the duckbilled valve in the valve body is provided with an extension piece, the extension piece is internally provided with an auxiliary closed opening, and the cavity and the intercepting block are matched with the main closed opening, so that a multi-stage sealing structure can be realized during closing, and during closing, the cavity and the intercepting block are tightly attached in sequence; the parts can be tightly attached in sequence according to the preset sequence to form a multi-layer and multi-level physical barrier, the backflow phenomenon of blood is effectively reduced, the sealing performance of the valve body is improved, and the stability and safety of blood flowing are ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of hemodialysis, and in particular to a hemodialysis catheter anti-backflow and thrombus self-cleaning mechanical valve structure. Background Art

[0002] Hemodialysis is a renal replacement therapy that uses an extracorporeal circulation device to remove metabolic waste from the blood and maintain water and electrolyte balance. It is commonly used for patients with chronic renal failure, acute kidney injury, etc. The patient's blood is drawn out of the body and flows through a dialyzer (containing a semipermeable membrane). Toxins such as urea and creatinine in the blood and excess water diffuse into the dialysate through the semipermeable membrane, while macromolecules such as blood cells and proteins remain in the blood. The purified blood is returned to the body through a pipeline. The entire process requires the use of a dialysis machine to precisely control parameters such as blood flow and dialysate flow rate.

[0003] In the prior art, during hemodialysis, the catheter is a common component that enables blood circulation and dialysis operations. To reduce blood backflow, a one-way valve such as a duckbill valve is often installed in the catheter. However, the existing one-way duckbill valve relies on pressure to open and close, and has only one barrier structure in the closed state. When the closed mouth is contaminated with impurities in the blood, it can easily lead to a loose seal, causing blood backflow, thereby affecting the dialysis effect and even posing a safety hazard to the patient.

[0004] To this end, we propose a hemodialysis catheter anti-backflow and thrombus self-cleaning mechanical valve structure. Summary of the Invention

[0005] In response to the shortcomings of the existing technology, the present invention provides a hemodialysis thrombus self-cleaning catheter and a mechanical valve structure to prevent backflow, which solves the problem that the existing one-way duckbill valve relies on pressure to open and close, and has only one layer of blocking structure in the closed state. When the closed mouth is contaminated with impurities in the blood, it is easy to cause a loose seal and cause blood backflow.

[0006] To achieve the above object, the present invention is implemented through the following technical solutions: a mechanical valve structure for preventing backflow of hemodialysis, comprising a valve body, said valve body comprising a valve shell one and a valve shell two, said valve shell one being threadedly connected to the inner wall of the valve shell one, said valve shell two being provided with a duckbill valve on the inner side of said valve shell two, said valve shell two being provided with a placement groove on the surface of said valve shell two, said placement groove for inserting the duckbill valve, said placement groove being fixedly connected to a plurality of positioning rods on the inner wall of said placement groove, said positioning rods being plugged into the inner wall of the duckbill valve, said duckbill valve being provided with a main closing port, said duckbill valve being fixedly connected with an extension portion on a side close to the main closing port, said extension portion being provided with an extrusion assembly that improves the sealing of the extension portion, said valve shell one and valve shell two being fixedly connected with a liquid inlet pipe and a liquid outlet pipe on one side respectively, said liquid inlet pipe and liquid outlet pipe being provided with a connecting assembly, said liquid inlet pipe and liquid outlet pipe being provided with a spiral guide portion one and a spiral guide portion two on the inner walls thereof respectively;

[0007] The extension portion includes an extension piece fixed on the surface of the duckbill valve, the inner wall of the extension piece is provided with a cavity and a secondary closing port, and the upper and lower inner walls of the cavity are respectively fixedly connected with a plurality of interception blocks;

[0008] The extrusion assembly comprises a support ring, an inner ring of which is fixedly connected with two groups of extrusion parts, and the extrusion parts are fixed on the surface of the extension piece.

[0009] Preferably, it includes a catheter body, one end of which is provided with a connector, each group of the self-cleaning components is composed of multiple convex parts one and convex parts two, and the multiple convex parts one and convex parts two are fixed to the inner wall of the catheter body in a circular shape, with a distance left between the two, and are arranged in a staggered manner.

[0010] Through the above components, when the liquid flows smoothly into the interior of the catheter body, the dialysis liquid will first come into contact with the first and second protrusions. When the liquid flows through these protrusions, vortices will be generated without relying on any additional power source. Once the vortex is formed, its impact force will effectively act on the inner wall of the catheter body, quickly and thoroughly peeling off the blood clots attached to the wall. The catheter body can always remain unobstructed, thereby successfully realizing its self-cleaning function.

[0011] Preferably, the plurality of intercepting blocks are arranged at an inclination, and the inclination direction is consistent with the blood flow direction.

[0012] Preferably, the extension piece, interception block and duckbill valve are all made of silicone.

[0013] Preferably, the extrusion portion includes two elastic strips fixed in the inner ring of the support ring, the elastic strips are arranged in an arc shape, and the surface of the elastic strip is fixedly connected with a fitting block, and the fitting block is fixedly connected to the surface of the extension piece. Through the above components, the support ring can be fitted and supported on the second inner wall of the valve housing. When the duckbill valve and the extension piece expand and open, the extension piece will squeeze the fitting block and the elastic strip, and the elastic strip will deform to cooperate with the extension piece to perform opening and closing operations. When the secondary closing port of the extension piece is closed, the elastic strip cooperates with the fitting block to make the secondary closing port close more tightly, thereby reducing the phenomenon of backflow.

[0014] Preferably, two handles are fixedly connected to the outer surfaces of the valve housing 1 and the valve housing 2, and the two handles are symmetrically arranged.

[0015] Preferably, the connecting assembly includes a connecting groove opened on the surface of one end of the liquid inlet pipe and the liquid outlet pipe, the inner walls of the liquid inlet pipe and the liquid outlet pipe are slidably connected with a plurality of blocks, the surfaces of the blocks are fixedly connected to two sliding rods, the sliding rods are slidably connected to the inner walls of the liquid inlet pipe and the liquid outlet pipe, and the surface of the sliding rod is provided with a spring, one end of the spring is fixedly connected to the surface of the block, and the other end is fixedly connected to the inner wall of the liquid inlet pipe or the inner wall of the liquid outlet pipe.

[0016] Preferably, the connecting assembly also includes a control ring rotatably connected to the surface of the liquid inlet pipe and the liquid outlet pipe, and the inner wall of the control ring is fixedly connected to multiple groups of extrusion blocks. Through the above components, the control ring is rotated, and the control ring can drive the multiple groups of extrusion blocks to rotate and squeeze the card blocks, so that the card blocks and the sliding rod move in the inner wall of the liquid inlet pipe or the liquid outlet pipe.

[0017] Preferably, the first convex portion and the second convex portion both include a convex block and a plurality of tapered portions, the plurality of tapered portions are fixed on the surface of the convex block, and the convex block is arranged in an arc-shaped strip and is made of rubber.

[0018] Preferably, the connector includes a plug, and a surface of one end of the plug is provided with a plurality of slots for connection and positioning.

[0019] In summary, the technical effects and advantages of the present invention are:

[0020] 1. In the present invention, by setting a valve body, an extension piece is provided on the duckbill valve in the valve body, and the extension piece is provided with a secondary closing port, a cavity and an intercepting block to cooperate with the main closing port, so that a multi-level sealing structure can be realized when closed, and the parts can be tightly fitted in sequence when closed. These parts can be tightly fitted in sequence according to a preset order to form a multi-layered and multi-level physical barrier, which effectively reduces the backflow of blood, improves the sealing performance of the valve body, and ensures the stability and safety of blood flow.

[0021] 2. In the present invention, by setting an extrusion assembly, the extension piece can be closed by cooperating with the two sets of extrusion parts (elastic rubber strip and fitting block) on the inner wall of the support ring. The elastic rubber strip can cooperate closely with the fitting block to jointly apply force on the extension piece, ensuring the stability and reliability of the extension piece during the closing process, thereby effectively enhancing the overall anti-backflow performance, further optimizing the sealing effect of the system, ensuring the unidirectional flow of fluid in the pipeline, and reducing the occurrence of backflow.

[0022] 3. In the present invention, multiple groups of self-cleaning components are arranged in the inner wall of the catheter body. Each group of self-cleaning components is a staggered convex part 1 and convex part 2 (convex part and conical part). The principles of fluid dynamics are used to make the liquid collide and generate vortex when flowing through. The thrombus on the inner wall can be peeled off without additional power, keeping the catheter body unobstructed. The structure is simple and efficient.

[0023] 4. In the present invention, by providing a connecting assembly and a connecting head, the catheter body and the valve body can be connected quickly and conveniently, the overall operation is convenient and fast, and the overall usability is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of the overall structure of a hemodialysis thrombus self-cleaning catheter and a mechanical valve structure for preventing backflow according to the present invention;

[0025] Figure 2 This is a schematic diagram of the exploded structure of a mechanical valve structure for preventing backflow in hemodialysis according to the present invention;

[0026] Figure 3 This is a schematic cross-sectional view of a mechanical valve structure for preventing backflow in hemodialysis according to the present invention;

[0027] Figure 4 The present invention is a mechanical valve structure for preventing backflow of hemodialysis Figure 3 Schematic diagram of the structure at A in the middle;

[0028] Figure 5 This is a schematic cross-sectional view of a mechanical valve structure for preventing backflow in hemodialysis according to the present invention from another perspective;

[0029] Figure 6 The present invention is a mechanical valve structure for preventing backflow of hemodialysis Figure 5 Schematic diagram of the structure at B in the middle;

[0030] Figure 7 This is a schematic structural diagram of a hemodialysis backflow prevention mechanical valve structure from another perspective of the present invention;

[0031] Figure 8 This is a schematic diagram of the structure of an extrusion assembly of a mechanical valve structure for preventing backflow in hemodialysis according to the present invention;

[0032] Figure 9 This is a schematic diagram of the structure of a catheter body of a hemodialysis thrombus self-cleaning catheter according to the present invention;

[0033] Figure 10 This is a schematic diagram of the cross-sectional structure of a catheter body of a hemodialysis thrombus self-cleaning catheter of the present invention;

[0034] Figure 11 This is a partial structural diagram of a hemodialysis thrombus self-cleaning catheter according to the present invention.

[0035] In the figure: 1. catheter body; 2. valve body; 21. valve shell 1; 22. valve shell 2; 23. duckbill valve; 24. placement groove; 25. positioning rod; 26. extension part; 261. extension piece; 262. cavity; 263. auxiliary closing mouth; 264. intercepting block; 27. extrusion assembly; 271. support ring; 272. elastic rubber strip; 273. fitting block; 28. handle; 29. ​​main closing mouth; 3. connector; 31. plug; 32. slot; 4. liquid inlet pipe; 5. liquid outlet pipe; 6. connecting assembly; 61. control ring; 62. block; 63. slide rod; 64. spring; 65. connecting groove; 66. extrusion block; 7. spiral guide part 1; 8. spiral guide part 2; 9. self-cleaning assembly; 91. convex part 1; 911. convex block; 912. conical part; 92. convex part 2. DETAILED DESCRIPTION

[0036] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments 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.

[0037] refer to Figure 1 - Figure 8 The mechanical valve structure for preventing backflow in hemodialysis shown in the figure includes a valve body 2, which includes a valve shell 1 21 and a valve shell 2 22. The valve shell 1 21 is threadedly connected to the inner wall of the valve shell 1 21. A duckbill valve 23 is provided on the inner side of the valve shell 22. A placement groove 24 is provided on the surface of the valve shell 22. The placement groove 24 is for inserting the duckbill valve 23. A plurality of positioning rods 25 are fixedly connected to the inner wall of the placement groove 24. The positioning rods 25 are plugged into the inner wall of the duckbill valve 23. A main closing port 29 is provided on the duckbill valve 23. The duckbill valve 23 is close to the main An extension portion 26 is fixedly connected to one side of the closed port 29. An extrusion assembly 27 is provided on the surface of the extension portion 26 to improve the sealing of the extension portion 26. A liquid inlet pipe 4 and a liquid outlet pipe 5 are fixedly connected to one side of the valve housing 1 21 and the valve housing 2 22, respectively. The liquid inlet pipe 4 and the liquid outlet pipe 5 are both provided with a connecting assembly 6. The inner walls of the liquid inlet pipe 4 and the liquid outlet pipe 5 are respectively provided with a spiral guide portion 1 7 and a spiral guide portion 2 8. Two handles 28 are fixedly connected to the outer surfaces of the valve housing 1 21 and the valve housing 2 22. The two handles 28 are symmetrically arranged.

[0038] Among them, the extension part 26 includes an extension piece 261 fixed on the surface of the duckbill valve 23, the inner wall of the extension piece 261 is provided with a cavity 262 and a secondary closing mouth 263, and the upper and lower inner walls of the cavity 262 are respectively fixedly connected with multiple interception blocks 264, and the multiple interception blocks 264 are arranged at an angle, and the inclination direction is consistent with the blood flow direction.

[0039] In this embodiment: during operation, when the main closing port 29 in the duckbill valve 23 gradually opens, the liquid will first flow into the cavity 262 of the extension 261. At this time, the cavity 262 begins to expand under the pressure of the liquid. This expansion effect drives the upper and lower interception blocks 264 to gradually separate. Subsequently, the liquid smoothly enters the secondary closing port 263. As the secondary closing port 263 opens, the liquid can pass smoothly, thereby realizing the circulation operation of the entire system. When closing is required, the secondary closing port 263, multiple interception blocks 264 and the main closing port 29 will be tightly closed in turn to form a multi-seal interception structure, which effectively reduces the occurrence of backflow and ensures the stable operation of the system.

[0040] Among them, the extrusion assembly 27 includes a support ring 271, and two groups of extrusion parts are fixedly connected to the inner ring of the support ring 271. The extrusion parts are fixed on the surface of the extension part 261. The extrusion parts include two elastic rubber strips 272 fixed in the inner ring of the support ring 271. The elastic rubber strips 272 are arranged in an arc shape, and the surface of the elastic strips is fixedly connected with a fitting block 273, and the fitting block 273 is fixedly connected to the surface of the extension part 261.

[0041] In this embodiment: the support ring 271 is designed to provide a tight fit support on the inner wall of the valve housing 22 to ensure the stability and functionality of the structure. When the duckbill valve 23 and its extension 261 open and close due to the blood flow pressure difference, the extension 261 will gradually exert pressure on the fitting block 273 and the elastic strip 272. The elastic strip 272 will deform and cooperate with the extension 261 to perform smooth opening and closing operations. When the secondary closing port 263 of the extension 261 is in a closed state, the elastic strip 272 will cooperate with the fitting block 273 to make the closure of the secondary closing port 263 tighter and more strict, effectively reducing the occurrence of backflow, thereby improving the overall anti-backflow effect and ensuring stability and reliability in the working state.

[0042] The extension piece 261 , the intercepting block 264 and the duckbill valve 23 are all made of silicone.

[0043] Among them, the connecting component 6 includes a connecting groove 65 opened on the surface of one end of the liquid inlet pipe 4 and the liquid outlet pipe 5, and the inner walls of the liquid inlet pipe 4 and the liquid outlet pipe 5 are slidably connected with a plurality of blocks 62. The surface of the block 62 is fixedly connected to two sliding rods 63. The sliding rod 63 is slidably connected to the inner walls of the liquid inlet pipe 4 and the liquid outlet pipe 5. The surface of the sliding rod 63 is sleeved with a spring 64. One end of the spring 64 is fixedly connected to the surface of the block 62, and the other end is fixedly connected to the inner wall of the liquid inlet pipe 4 or the inner wall of the liquid outlet pipe 5. The connecting component 6 also includes a control ring 61 rotatably connected to the surface of the liquid inlet pipe 4 and the liquid outlet pipe 5, and the inner wall of the control ring 61 is fixedly connected to multiple groups of extrusion blocks 66.

[0044] In this embodiment, by rotating the control ring 61, the control ring 61 can drive the multiple groups of extrusion blocks 66 to rotate and squeeze the clamping block 62, so that the clamping block 62 and the slide rod 63 move in the inner wall of the liquid inlet pipe 4 or the liquid outlet pipe 5. When the extrusion block 66 loses its extrusion, the spring 64 can drive the clamping block 62 to reset.

[0045] refer to Figure 1 - Figure 11The hemodialysis thrombus self-cleaning catheter shown includes a catheter body 1, a connector 3 is provided at one end of the catheter body 1, each group of self-cleaning components 9 is composed of multiple protrusions 91 and protrusions 92, multiple protrusions 91 and protrusions 92 are fixed to the inner wall of the catheter body 1 in a circular shape, with a spacing between the two, and are staggered. The protrusions 91 and protrusions 92 both include a protrusion 911 and multiple tapered portions 912, and the multiple tapered portions 912 are fixed on the surface of the protrusion 911. The protrusion 911 is arranged in an arc-shaped strip and is made of rubber. The connector 3 includes a plug 31, and a plurality of card slots 32 for connection and positioning are provided on one end surface of the plug 31.

[0046] In this embodiment, after the liquid flows smoothly into the interior of the catheter body 1, the dialyzed liquid will first come into contact with the first convex portion 91 and the second convex portion 92. When the liquid flows through these convex portions, it will violently collide with the bump 911 and the tapered portion 912, generating eddy currents. This does not require any additional power source. Once the eddy currents are formed, their impact force will effectively act on the inner wall of the catheter body 1, quickly and thoroughly stripping away the thrombi attached to the wall. The catheter body 1 can always remain unobstructed, thereby successfully achieving its self-cleaning function.

[0047] The working principle of the present invention is as follows: when in use, the connector 3 on the catheter body 1 can be first connected to the valve body 2. When connected, the control ring 61 can be rotated on the liquid inlet pipe 4 and the liquid outlet pipe 5. The control ring 61 can drive multiple groups of extrusion blocks 66 to rotate and squeeze the card block 62, so that the card block 62 and the slide bar 63 move in the inner wall of the liquid inlet pipe 4 or the liquid outlet pipe 5. The spring 64 is stressed. When the plug 31 is inserted into the connecting groove 65, the card block 62 can be inserted into the card groove 32 on the surface of the plug 31. The control ring 61 is rotated to reset. After the extrusion block 66 loses its extrusion on the card block 62, the spring 64 drives the card block 62 is reset, and the card block 62 abuts against the inner wall of the card groove 32, and the connection operation can be achieved. When the blood enters the catheter, the dialysis liquid will first contact the convex part 1 91 and the convex part 2 92. When the liquid flows through these convex parts, it will violently collide with the convex block 911 and the tapered part 912, generating eddy currents. There is no need to rely on any additional power source. Once the eddy current is formed, its impact force will effectively act on the inner wall of the catheter body 1, quickly and thoroughly peeling off the thrombus attached to the wall. The catheter body 1 can always remain unobstructed, thereby smoothly realizing its self-cleaning function, and then enters the liquid inlet pipe 4. , and passes through the spiral guide part 7 and enters the valve body 2. When the duckbill valve 23 drives the main closing port 29 to open and close due to the pressure difference of blood flow, the liquid will first flow into the cavity 262 of the extension part 261. At this time, the cavity 262 begins to expand under the pressure of the liquid. This expansion effect drives the upper and lower intercepting blocks 264 to gradually separate. Then, the liquid smoothly enters the secondary closing port 263. As the secondary closing port 263 opens, the extension part 261 expands and expands, and gradually exerts pressure on the fitting block 273 and the elastic strip 272. The elastic strip 272 will deform and cooperate with the extension part 261 for smooth flow. During the opening and closing operation, the liquid can pass smoothly into the liquid outlet pipe 5 and be discharged through the spiral guide part 2 8, thereby realizing the circulation operation of the entire system. When closing is required, the secondary closing port 263, the multiple intercepting blocks 264 and the main closing port 29 will be tightly closed in sequence to form a multi-sealed interception structure. At the same time, the elastic rubber strip 272 will cooperate with the fitting block 273 to make the closure of the secondary closing port 263 tighter and more strict, effectively reducing the occurrence of backflow, thereby improving the overall anti-backflow effect, ensuring stability and reliability in the working state, effectively reducing the occurrence of backflow, and ensuring the stable operation of the system.

[0048] The valve housing 1 21 and the valve housing 2 22 can be separated by the handle 28, and then the duckbill valve 23 can be taken out from the placement groove 24 and the positioning rod 25, which is convenient for maintenance and replacement operations.

[0049] The electrical components mentioned in this article are all connected to an external main controller and 220V mains electricity, and the main controller can be a conventional known device that performs control such as a computer.

[0050] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A mechanical valve structure for preventing backflow in hemodialysis, comprising a valve body (2), characterized in that: The valve body (2) includes a valve shell 1 (21) and a valve shell 2 (22), wherein the valve shell 1 (21) is threadedly connected to the inner wall of the valve shell 1 (21), and a duckbill valve (23) is provided on the inner side of the valve shell 2 (22), and a placement groove (24) is provided on the surface of the valve shell 2 (22), wherein the placement groove (24) is for inserting the duckbill valve (23), and a plurality of positioning rods (25) are fixedly connected to the inner wall of the placement groove (24), wherein the positioning rods (25) are plugged into the inner wall of the duckbill valve (23), and the duckbill valve (23) is provided with a main closing port (2 9), the duckbill valve (23) is fixedly connected to an extension portion (26) on one side close to the main closing port (29), and an extrusion component (27) is provided on the surface of the extension portion (26) to improve the sealing of the extension portion (26), and the valve housing 1 (21) and the valve housing 2 (22) are respectively fixedly connected to a liquid inlet pipe (4) and a liquid outlet pipe (5), and the liquid inlet pipe (4) and the liquid outlet pipe (5) are both provided with a connecting component (6), and the inner walls of the liquid inlet pipe (4) and the liquid outlet pipe (5) are respectively provided with a spiral guide portion 1 (7) and a spiral guide portion 2 (8); The extension portion (26) includes an extension piece (261) fixed on the surface of the duckbill valve (23); the inner wall of the extension piece (261) is provided with a cavity (262) and a secondary closing opening (263); the upper and lower inner walls of the cavity (262) are respectively fixedly connected with a plurality of interception blocks (264); The extrusion assembly (27) comprises a support ring (271), the inner ring of the support ring (271) being fixedly connected with two groups of extrusion parts, and the extrusion parts being fixed on the surface of the extension piece (261).

2. A hemodialysis thrombus self-cleaning catheter, characterized by: The invention comprises a catheter body (1), one end of which is provided with a connector (3), and each group of the self-cleaning components (9) is composed of a plurality of convex parts (91) and convex parts (92), and the plurality of convex parts (91) and convex parts (92) are fixed to the inner wall of the catheter body (1) in a circular shape, and a distance is left between the two, and the two are arranged in a staggered manner.

3. The hemodialysis backflow prevention mechanical valve structure according to claim 1, characterized in that: The plurality of intercepting blocks (264) are arranged in an inclined manner, and the inclination direction is consistent with the blood flow direction.

4. The hemodialysis backflow prevention mechanical valve structure according to claim 1, characterized in that: The extension piece (261), the interception block (264) and the duckbill valve (23) are all made of silicone.

5. The hemodialysis backflow prevention mechanical valve structure according to claim 1, characterized in that: The extrusion portion comprises two elastic rubber strips (272) fixed in the inner ring of the support ring (271), the elastic rubber strips (272) being arranged in an arc shape, and a fitting block (273) being fixedly connected to the surface of the elastic strips, and the fitting block (273) being fixedly connected to the surface of the extension piece (261).

6. The hemodialysis backflow prevention mechanical valve structure according to claim 1, characterized in that: Two handles (28) are fixedly connected to the outer surfaces of the valve housing 1 (21) and the valve housing 2 (22), and the two handles (28) are symmetrically arranged.

7. The hemodialysis backflow prevention mechanical valve structure according to claim 1, characterized in that: The connecting assembly (6) includes a connecting groove (65) provided on the surface of one end of the liquid inlet pipe (4) and the liquid outlet pipe (5), the inner walls of the liquid inlet pipe (4) and the liquid outlet pipe (5) are both slidably connected with a plurality of clamping blocks (62), the surfaces of the clamping blocks (62) are fixedly connected with two sliding rods (63), the sliding rods (63) are slidably connected to the inner walls of the liquid inlet pipe (4) and the liquid outlet pipe (5), and the surface of the sliding rod (63) is provided with a spring (64), one end of the spring (64) is fixedly connected to the surface of the clamping block (62), and the other end is fixedly connected to the inner wall of the liquid inlet pipe (4) or the inner wall of the liquid outlet pipe (5).

8. The hemodialysis backflow prevention mechanical valve structure according to claim 7, characterized in that: The connecting assembly (6) further comprises a control ring (61) rotatably connected to the surfaces of the liquid inlet pipe (4) and the liquid outlet pipe (5), and a plurality of groups of extrusion blocks (66) are fixedly connected to the inner wall of the control ring (61).

9. The hemodialysis thrombus self-cleaning catheter according to claim 2, characterized in that: The first convex portion (91) and the second convex portion (92) both include a convex block (911) and a plurality of conical portions (912). The plurality of conical portions (912) are fixed on the surface of the convex block (911). The convex block (911) is arranged in an arc-shaped strip and is made of rubber.

10. The hemodialysis thrombus self-cleaning catheter according to claim 2, characterized in that: The connector (3) comprises a plug (31), and a plurality of slots (32) for connection and positioning are provided on one end surface of the plug (31).

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