Dual lumen dialysis catheter

Abstract

The application discloses a double-cavity dialysis catheter and belongs to the technical field of hemodialysis, which comprises a catheter body, a first branch pipe and a second branch pipe are communicated and installed at one end of the catheter body through a connecting piece, an exhaust mechanism is arranged on the outer side of the catheter body, the exhaust mechanism comprises an auxiliary main pipe which is communicated and installed on the surface of the catheter body, a shielding assembly is arranged at one end of the auxiliary main pipe close to the catheter body, the shielding assembly comprises a shielding cylinder which is installed in the auxiliary main pipe, a liquid inlet hole for introducing sterile normal saline is arranged in the upper half section of the shielding cylinder, the gas filter plate in the lower half section of the shielding cylinder is used for discharging excess gas, the gas permeable membrane plate on the surface of the auxiliary main pipe is used for effectively separating and discharging the gas in the catheter, and the sterile normal saline is introduced through the liquid inlet hole in the upper half section of the shielding cylinder at the same time, so that the risk of gas embolism caused by the gas entering the blood circulation of a patient is avoided, the safety of the hemodialysis process is ensured, and the quality of the dialysis treatment is improved.

Description

Technical Field

[0001] This invention relates to the field of hemodialysis technology, and in particular to a dual-lumen dialysis catheter. Background Technology

[0002] In hemodialysis treatment, dialysis catheters are crucial medical devices for ensuring the smooth progress of the treatment. After each dialysis session, heparin solution is injected through a pair of branches to seal the catheter and reduce the formation of thrombi within it. During catheter pre-filling and use, residual gas is a common problem. If the gas in the catheter is not vented in a timely and effective manner, it may enter the patient's bloodstream during hemodialysis, causing gas embolism. Gas embolism can obstruct blood vessels, affecting blood perfusion to tissues and organs, leading to local ischemia and hypoxia, and in severe cases, even endangering the patient's life. Currently, some dialysis catheters use a simple vent design to expel gas. On the one hand, the size and position of the vent are difficult to control precisely, which may result in incomplete gas expulsion, leaving some gas trapped inside the catheter. On the other hand, during the venting process, improper operation or external interference can easily allow outside air to re-enter the catheter, causing secondary contamination and increasing the risk of infection. Summary of the Invention

[0003] The purpose of this invention is to provide a dual-lumen dialysis catheter to solve the problem mentioned in the background art, where improper operation or external factors can easily cause outside air to re-enter the catheter during the air venting process, resulting in secondary contamination and increased risk of infection.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a dual-lumen dialysis catheter, comprising a catheter body, one end of which is connected to and installed with a first branch tube and a second branch tube via a connector, an exhaust mechanism is provided on the outer side of the catheter body, the exhaust mechanism includes an auxiliary main tube connected to and installed on the surface of the catheter body, a shielding component is provided at one end of the auxiliary main tube near the catheter body, the shielding component includes a shielding cylinder installed inside the auxiliary main tube, the upper half of the shielding cylinder is provided with an inlet for introducing sterile saline, the lower half of the shielding cylinder is provided with a filter plate for discharging excess gas, and a breathable membrane is installed on the surface of the auxiliary main tube near the shielding cylinder.

[0005] As a preferred embodiment of the present invention, an exhaust assembly is provided on the outer side of the auxiliary main pipe. The exhaust assembly includes an air collecting cylinder installed on the outer side of the auxiliary main pipe. A piston is provided inside the air collecting cylinder. A pull rod slides through one end of the piston. A baffle for separating gas and pre-filled liquid is installed in the middle of the auxiliary main pipe. An air chamber communicating with the air collecting cylinder is opened on the surface of the auxiliary main pipe near the filter plate. A connecting air pipe communicating with the air collecting cylinder is installed inside the auxiliary main pipe near the liquid inlet.

[0006] As a preferred embodiment of the present invention, a pre-filling liquid assembly is provided on the outside of the auxiliary tube. The pre-filling liquid assembly includes an auxiliary bulb installed on the outside of the auxiliary tube. A pre-filling liquid bladder containing sterile physiological saline is installed inside the auxiliary bulb, and the pre-filling liquid bladder is in communication with the inside of the auxiliary tube. An inflation bladder is provided inside the auxiliary bulb, and the inflation bladder is in communication with the free end of the gas collecting cylinder through an inflation hose.

[0007] As a preferred embodiment of the present invention, a rubber soft plate is provided between the pre-filled liquid bladder and the air bladder to reduce friction damage, and a one-way liquid valve is provided between the pre-filled liquid bladder and the auxiliary main pipe.

[0008] As a preferred embodiment of the present invention, both ends of the shielding cylinder are rotatably equipped with helical blades, a half-baffle is fixedly installed at the end of the shielding cylinder near the duct body, and a scraper is fixedly installed at the end of the helical blade near the breathable membrane plate, and the scraper slides on the surface of the breathable membrane plate.

[0009] As a preferred embodiment of the present invention, a roller is installed inside the shielding cylinder, and the intermediate rod of the spiral blade is installed in the middle position of the roller. An arc-shaped pressure plate for protecting the roller is fixedly installed inside the shielding cylinder.

[0010] As a preferred embodiment of the present invention, the auxiliary main pipe is provided with a filter assembly, which includes a filter box installed inside the auxiliary main pipe. The filter box is equipped with multiple carbon plates for filtering gas, and the carbon plates are made of activated carbon powder of different particle sizes under pressure.

[0011] As a preferred embodiment of the present invention, the carbon plate is provided with an ion exchange resin column for adsorbing high concentrations or easily saturated ion-type pollutants, and the filter box is provided with an acid treatment box, with the free end of the ion exchange resin column inserted inside the acid treatment box.

[0012] As a preferred embodiment of the present invention, the catheter body is made of a silicone composite layer. An anticoagulant layer is provided on the outer surface of the silicone composite layer. The anticoagulant layer is made of heparin coating which binds to a pentasaccharide sequence and antithrombin. An antigel coating is provided on the inner surface of the silicone composite layer. The antigel coating is made of polyvinyl alcohol for anti-protein adhesion. A smooth coating is provided on the inner side of the antigel coating. The smooth coating is made of polyurethane for reducing the coefficient of friction.

[0013] As a preferred embodiment of the present invention, a sealing component is provided at the end of the auxiliary main pipe away from the main pipe body, and a pressure relief valve for reducing the internal air pressure of the auxiliary main pipe is provided on the surface of the sealing component.

[0014] Compared with the prior art, the beneficial effects of the present invention are:

[0015] 1. This invention incorporates a shielding component, in which excess gas is discharged through the lower half of the filter plate, and in conjunction with the breathable membrane plate on the surface of the auxiliary tube, effectively separates and discharges gas from the catheter, while simultaneously shielding the inlet hole in the upper half of the cylinder to introduce sterile saline. This design avoids the risk of gas embolism caused by gas entering the patient's bloodstream, ensuring the safety of the hemodialysis process and improving the quality of dialysis treatment.

[0016] 2. This invention incorporates a pre-filling fluid assembly, wherein the pre-filling fluid bladder inside the auxiliary bulb is filled with sterile saline and is connected to the internal part of the auxiliary main tube. The negative pressure generated by the piston pulling the gas collecting cylinder allows the pre-filling fluid to smoothly enter the catheter. At the same time, the one-way valve between the pre-filling fluid bladder and the auxiliary main tube prevents backflow of the fluid, reducing the possibility of contamination of the pre-filling fluid and lowering the risk of infection in patients due to contamination of the pre-filling fluid.

[0017] 3. The present invention employs a multi-layer filtration structure in its filtration components. Multiple carbon plates within the filter chamber are made of activated carbon powder of different particle sizes under pressure, which can effectively adsorb impurities and odors in the gas. At the same time, ion exchange resin columns inserted within the carbon plates can adsorb high concentrations or easily saturated ionic pollutants. Furthermore, the free ends of the ion exchange resin columns are inserted into the acid treatment chamber, which can further treat the adsorbed pollutants. This filtration design ensures the purity of the discharged gas and prevents harmful substances from entering the patient's body with the gas.

[0018] 4. This invention employs a catheter body with multiple special coatings. The anticoagulant layer on the outer surface of the silicone composite layer is made of heparin coating with a pentasaccharide sequence that binds to antithrombin, which can effectively inhibit thrombus formation. The antigel coating on the inner surface is made of polyvinyl alcohol that resists protein adhesion, which can reduce the formation of protein gel. The smooth coating inside the antigel coating is made of polyurethane that reduces the coefficient of friction, making the catheter surface smoother. These coating designs reduce friction between the catheter and the blood vessel wall during catheter insertion, reduce vascular damage and patient pain, and at the same time improve the stability and positioning accuracy of the catheter in the blood vessel.

[0019] 5. This invention effectively prevents liquid and gas leakage by incorporating a sealing component inside the auxiliary tube, ensuring the airtightness of the dialysis process. At the same time, the pressure relief valve on the surface of the sealing component can automatically release pressure when the internal air pressure of the auxiliary tube is too high, avoiding the occurrence of catheter rupture or affecting the dialysis effect due to excessive air pressure, thus ensuring the stability of the dual-lumen dialysis catheter during use. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0021] Figure 2 This is a schematic diagram of the cross-sectional structure of the catheter body of the present invention;

[0022] Figure 3 This is a schematic diagram of the auxiliary main structure of the present invention;

[0023] Figure 4 This is a schematic diagram of the internal structure of the auxiliary supervisor of the present invention;

[0024] Figure 5 This is a schematic diagram of the shielding cylindrical structure of the present invention;

[0025] Figure 6 This is a schematic diagram of the internal structure of the shielding cylinder of the present invention;

[0026] Figure 7 This is a schematic diagram of the pre-filled liquid bladder structure of the present invention;

[0027] Figure 8 This is a schematic diagram of the internal structure of the filter box of the present invention.

[0028] In the diagram: 1. Catheter body; 11. Anticoagulant layer; 12. Silicone composite layer; 13. Antigel coating; 14. Smooth coating; 2. Connector; 3. First branch tube; 4. Second branch tube; 5. Exhaust mechanism; 51. Shielding assembly; 511. Half baffle; 512. Spiral blade; 513. Inlet port; 514. Air filter plate; 515. Shielding cylinder; 516. Scraper; 517. Breathable membrane plate; 518. Roller; 519. Arc-shaped pressure plate; 52. Filter assembly; 521. Filter... 522. Ion exchange resin column; 523. Acid treatment box; 524. Carbon plate; 53. Auxiliary main pipe; 54. Exhaust assembly; 541. Connecting air pipe; 542. Air chamber; 543. Piston; 544. Partition plate; 545. Air collection cylinder; 546. Pull rod; 55. Pre-filled liquid assembly; 551. Inflation hose; 552. One-way liquid valve; 553. Rubber flexible sheet; 554. Pre-filled liquid bladder; 555. Inflation bladder; 556. Auxiliary ball cylinder; 56. Sealing component; 57. Pressure relief valve. Detailed Implementation

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] Please see Figure 1-8This invention provides a dual-lumen dialysis catheter, including a catheter body 1. One end of the catheter body 1 is connected to a first branch tube 3 and a second branch tube 4 via a connector 2. An exhaust mechanism 5 is provided on the outside of the catheter body 1. The exhaust mechanism 5 includes an auxiliary main tube 53 connected to and installed on the surface of the catheter body 1. A shielding component 51 is provided at one end of the auxiliary main tube 53 near the catheter body 1. The shielding component 51 includes a shielding cylinder 515 installed inside the auxiliary main tube 53. The upper half of the shielding cylinder 515 is provided with an inlet hole 513 for introducing sterile saline, and the lower half of the shielding cylinder 515 is provided with a filter plate 514 for discharging excess gas. A breathable membrane plate 517 is installed on the surface of the auxiliary main tube 53 near the shielding cylinder 515.

[0031] The catheter body 1 serves as the main structure, with one end connected to the first branch tube 3 and the second branch tube 4 via a connector 2. This allows for different dialysis functions: one branch tube is used to draw out the patient's blood, while the other branch tube is used to return the dialyzed blood to the patient. The dual-lumen design allows for simultaneous blood draw-out and return operations, improving dialysis efficiency. An exhaust mechanism 5 is located on the outside of the catheter body 1. The auxiliary main tube 53 of the exhaust mechanism 5 is connected to the surface of the catheter body 1. Sterile saline is introduced through the inlet hole 513 in the upper half of the shielding cylinder 515, while the filter plate 514 in the lower half discharges excess gas. Combined with the breathable membrane 517 on the surface of the auxiliary main tube 53, this effectively separates and discharges gas from the catheter. This design avoids the risk of gas embolism caused by gas entering the patient's bloodstream, ensuring the safety of the hemodialysis process and improving the quality of dialysis treatment.

[0032] In some embodiments, an exhaust assembly 54 is provided on the outside of the auxiliary main pipe 53. The exhaust assembly 54 includes an air collection cylinder 545 installed on the outside of the auxiliary main pipe 53. A piston 543 is provided inside the air collection cylinder 545. A pull rod 546 slides through one end of the piston 543. A partition 544 for separating gas and pre-filled liquid is installed in the middle of the auxiliary main pipe 53. An air chamber 542 communicating with the air collection cylinder 545 is opened on the surface of the auxiliary main pipe 53 near the air filter plate 514. A connecting air pipe 541 communicating with the air collection cylinder 545 is installed inside the auxiliary main pipe 53 near the liquid inlet hole 513.

[0033] Pulling the lever 546 causes the piston 543 to slide within the gas collecting cylinder 545. When the piston 543 is pulled outward, a negative pressure is generated within the gas collecting cylinder 545. Excess gas in the auxiliary tube 53 is drawn into the gas collecting cylinder 545 through the air chamber 542 and the connecting air tube 541. The pulling operation of the piston 543 can actively and effectively expel excess gas from the auxiliary tube 53, preventing gas from entering the patient's body and causing danger. The partition 544 ensures the independent flow of gas and pre-filling fluid within the auxiliary tube 53, improving the accuracy of the venting and pre-filling operations.

[0034] In some embodiments, a pre-filling fluid assembly 55 is provided on the outside of the auxiliary tube 53. The pre-filling fluid assembly 55 includes an auxiliary bulb 556 installed on the outside of the auxiliary tube 53. A pre-filling fluid bladder 554 of sterile physiological saline is installed inside the auxiliary bulb 556, and the pre-filling fluid bladder 554 communicates with the inside of the auxiliary tube 53. An inflation bladder 555 is provided inside the auxiliary bulb 556, and the inflation bladder 555 is connected to the free end of the gas collecting cylinder 545 through an inflation hose 551.

[0035] When the piston 543 is pushed inward, gas is inflated into the inflation bladder 555 through the inflation hose 551. The inflation bladder 555 expands, squeezing the pre-filled fluid bladder 554. This causes the sterile saline solution in the pre-filled fluid bladder 554 to enter the auxiliary main pipe 53 through the one-way valve 552. The pressure change of the gas in the gas collecting cylinder 545 drives the pre-filled fluid bladder 554 to release the sterile saline solution, thus realizing the automatic pre-filling function. At the same time, the pre-filling and venting are carried out simultaneously, which can maximize the drainage stability of the catheter body 1. Moreover, the pre-filling solution is sterile saline solution, which can reduce the stimulation of the patient's blood vessels and reduce the risk of infection.

[0036] In some embodiments, a rubber soft plate 553 for reducing frictional damage is provided between the pre-filled liquid bladder 554 and the inflatable bladder 555, and a one-way liquid valve 552 is provided between the pre-filled liquid bladder 554 and the auxiliary main pipe 53.

[0037] The rubber soft plate 553 is placed between the pre-filled liquid bladder 554 and the inflation bladder 555 to buffer and reduce friction, preventing damage caused by direct friction between the inflation bladder 555 and the pre-filled liquid bladder 554 during expansion and contraction; the one-way liquid valve 552 only allows the pre-filled liquid to flow from the pre-filled liquid bladder 554 to the auxiliary main pipe 53, preventing the liquid in the auxiliary main pipe 53 from flowing back into the pre-filled liquid bladder 554, ensuring the accuracy of the pre-filling operation and avoiding the impact of liquid backflow on the dialysis effect.

[0038] In some embodiments, both ends of the shielding cylinder 515 are rotatably mounted with helical blades 512, a half baffle 511 is fixedly mounted at one end of the shielding cylinder 515 near the conduit body 1, and a scraper 516 is fixedly mounted at one end of the helical blades 512 near the breathable membrane 517, and the scraper 516 slides on the surface of the breathable membrane 517.

[0039] During dialysis, the liquid flows inside the catheter body 1. During the flow, half of the spiral blades 512 are blocked by the half baffle 511. When the liquid impacts the other half of the spiral blades 512, it will cause the spiral blades 512 to rotate. This not only accelerates the gas discharge, but also allows the scraper 516 at the end of the spiral blades 512 near the breathable membrane 517 to slide on the surface of the breathable membrane 517. This can clean impurities or substances that may block the vents on the surface of the breathable membrane 517, and maintain the breathability of the breathable membrane 517.

[0040] In some embodiments, a roller 518 is installed inside the shielding cylinder 515, and the intermediate rod of the spiral blade 512 is installed at the middle position of the roller 518. An arc-shaped pressure plate 519 for protecting the roller 518 is fixedly installed inside the shielding cylinder 515.

[0041] Inside the shielding cylinder 515, a roller 518 is installed. The roller 518 provides a stable axis of rotation for the helical blade 512, enabling the helical blade 512 to rotate stably around the roller 518 and ensuring the smoothness of the rotation of the helical blade 512. The arc-shaped pressure plate 519 is fixed inside the shielding cylinder 515 and plays a protective role for the roller 518, preventing the roller 518 from being interfered with or damaged by external factors.

[0042] In some embodiments, the auxiliary main pipe 53 is provided with a filter assembly 52, which includes a filter box 521 installed inside the auxiliary main pipe 53. The filter box 521 is provided with a multi-layer carbon plate 524 for filtering gas, and the carbon plate 524 is made of activated carbon powder of different particle sizes under pressure.

[0043] The filter box 521 of the filter assembly 52 is installed inside the auxiliary main pipe 53. After the gas enters the filter box 521, it passes through multiple carbon plates 524 made of activated carbon powder of different particle sizes under pressure. The activated carbon powder of different particle sizes can adsorb impurities and odor molecules of different sizes in the gas in layers, which can more comprehensively and thoroughly remove impurities and odors in the gas, improve the purity of the discharged gas, prevent harmful substances from entering the patient's body with the gas, and protect the patient's health and the safety of the dialysis process.

[0044] In some embodiments, an ion exchange resin column 522 for adsorbing high concentrations or easily saturated ion pollutants is inserted inside the carbon plate 524, and an acid treatment box 523 is installed inside the filter box 521, with the free end of the ion exchange resin column 522 inserted inside the acid treatment box 523.

[0045] The ion exchange resin column 522 is inserted inside the carbon plate 524, which can adsorb high concentrations or easily saturated ionic pollutants in the gas, further improving the gas purification effect. The free end of the ion exchange resin column 522 is inserted inside the acid treatment box 523. The acid treatment box 523 can perform acid treatment on the ion exchange resin column 522 that has adsorbed pollutants, so that the ion exchange resin column 522 can restore its adsorption capacity, realize reuse, and further optimize gas filtration.

[0046] In some embodiments, the catheter body 1 is made of a silicone composite layer 12. An anticoagulant layer 11 is provided on the outer surface of the silicone composite layer 12. The anticoagulant layer 11 is made of a heparin coating that binds a pentasaccharide sequence to an antithrombin. An antigel coating 13 is provided on the inner surface of the silicone composite layer 12. The antigel coating 13 is made of polyvinyl alcohol for anti-protein adhesion. A smooth coating 14 is provided on the inner side of the antigel coating 13. The smooth coating 14 is made of polyurethane for reducing the coefficient of friction.

[0047] The catheter body 1 is made of a silicone composite layer 12, with an anticoagulant layer 11 on the outer surface. The heparin coating, which binds to antithrombin through a pentasaccharide sequence, can inhibit thrombus formation and prevent blood from clotting on the surface of the catheter body 1, reducing the risk of catheter body 1 blockage and complications caused by thrombosis. The inner surface is provided with an antigel coating 13, made of polyvinyl alcohol that resists protein adhesion, which can reduce protein adhesion to the inner wall of the catheter body 1, prevent gel formation, keep the inner wall of the catheter body 1 clean, and reduce the chance of infection. The inner side of the antigel coating 13 is provided with a smooth coating 14, made of polyurethane that reduces the coefficient of friction, which reduces the friction when blood flows in the catheter body 1, making blood flow smoother, improving dialysis efficiency, and reducing damage to the patient's blood vessels.

[0048] In some embodiments, a sealing member 56 is provided at the end of the auxiliary tube 53 away from the conduit body 1, and a pressure relief valve 57 for reducing the internal air pressure of the auxiliary tube 53 is provided on the surface of the sealing member 56.

[0049] Among them, the sealing component 56 ensures the sealing of the auxiliary main pipe 53 during dialysis, preventing liquid and gas leakage from affecting the dialysis effect and causing environmental pollution; the pressure relief valve 57 can adjust the internal air pressure of the auxiliary main pipe 53 in a timely manner, avoiding the rupture of the catheter body 1 or affecting the normal operation of other components due to excessive air pressure, thus improving the safety and stability of the equipment.

[0050] Working principle: During dialysis, the catheter body 1 serves as the main structure. One end is connected to the first branch tube 3 and the second branch tube 4 via the connector 2 to achieve different dialysis functions. One branch tube is used to draw out the patient's blood, and the other branch tube is used to return the dialyzed blood to the patient's body. The dual-lumen design allows for simultaneous blood draw-out and return operations, improving dialysis efficiency. An exhaust mechanism 5 is installed on the outside of the catheter body 1. The auxiliary main tube 53 of the exhaust mechanism 5 is connected to the surface of the catheter body 1. Sterile saline is introduced through the inlet hole 513 in the upper half of the shielding cylinder 515, and excess gas is discharged through the filter plate 514 in the lower half. In conjunction with the breathable membrane plate 517 on the surface of the auxiliary main tube 53, the gas inside the catheter can be effectively separated and discharged. This design avoids the risk of gas embolism caused by gas entering the patient's blood circulation, ensuring the safety of the hemodialysis process and improving the quality of dialysis treatment.

[0051] The above are merely specific embodiments of the present invention, but the technical features of the present invention are not limited thereto. Any simple changes, equivalent substitutions, or modifications made based on the present invention to solve essentially the same technical problems and achieve essentially the same technical effects are all covered within the protection scope of the present invention.

Claims

1. A dual-lumen dialysis catheter, comprising a catheter body (1), characterized in that: One end of the catheter body (1) is connected to a first branch tube (3) and a second branch tube (4) via a connector (2). An exhaust mechanism (5) is provided on the outside of the catheter body (1). The exhaust mechanism (5) includes an auxiliary main tube (53) connected to the surface of the catheter body (1). A shielding component (51) is provided at one end of the auxiliary main tube (53) near the catheter body (1). The shielding component (51) includes a shielding cylinder (515) installed inside the auxiliary main tube (53). An inlet hole (513) for introducing sterile saline is provided in the upper half of the shielding cylinder (515). A filter plate (514) for discharging excess gas is provided in the lower half of the shielding cylinder (515). A breathable membrane plate (517) is installed on the surface of the auxiliary main tube (53) near the shielding cylinder (515). An exhaust assembly (54) is provided on the outside of the auxiliary main pipe (53). The exhaust assembly (54) includes a gas collecting cylinder (545) installed on the outside of the auxiliary main pipe (53). A piston (543) is provided inside the gas collecting cylinder (545). A pull rod (546) slides through one end of the piston (543). A partition plate (544) for separating gas and pre-filled liquid is installed in the middle of the auxiliary main pipe (53). An air chamber (542) communicating with the gas collecting cylinder (545) is opened on the surface of the auxiliary main pipe (53) near the filter plate (514). A connecting air pipe (541) communicating with the gas collecting cylinder (545) is installed inside the auxiliary main pipe (53) near the liquid inlet (513). A pre-filling fluid assembly (55) is provided on the outside of the auxiliary tube (53). The pre-filling fluid assembly (55) includes an auxiliary bulb (556) installed on the outside of the auxiliary tube (53). A pre-filling fluid bladder (554) of sterile physiological saline is installed inside the auxiliary bulb (556), and the pre-filling fluid bladder (554) is connected to the inside of the auxiliary tube (53). An inflation bladder (555) is provided inside the auxiliary bulb (556), and the inflation bladder (555) is connected to the free end of the gas collecting cylinder (545) through an inflation hose (551). Both ends of the shielding cylinder (515) are rotatably equipped with helical blades (512). A half baffle (511) is fixedly installed at one end of the shielding cylinder (515) near the conduit body (1). A scraper (516) is fixedly installed at one end of the helical blade (512) near the breathable membrane plate (517), and the scraper (516) slides on the surface of the breathable membrane plate (517).

2. The dual-lumen dialysis catheter according to claim 1, characterized in that: A rubber soft plate (553) for reducing friction damage is provided between the pre-filled liquid bladder (554) and the air bladder (555), and a one-way liquid valve (552) is provided between the pre-filled liquid bladder (554) and the auxiliary main pipe (53).

3. The dual-lumen dialysis catheter according to claim 1, characterized in that: The shielding cylinder (515) has a roller (518) installed inside, and the middle rod of the spiral blade (512) is installed in the middle position of the roller (518). The shielding cylinder (515) has an arc-shaped pressure plate (519) fixedly installed inside for protecting the roller (518).

4. The dual-lumen dialysis catheter according to claim 1, characterized in that: The auxiliary main tube (53) is equipped with a filter assembly (52), which includes a filter box (521) installed inside the auxiliary main tube (53). The filter box (521) is equipped with multiple carbon plates (524) for filtering gas, and the carbon plates (524) are made of activated carbon powder of different particle sizes under pressure.

5. A dual-lumen dialysis catheter according to claim 4, characterized in that: The carbon plate (524) is internally fitted with an ion exchange resin column (522) for adsorbing high concentrations or easily saturated ion pollutants. The filter box (521) is internally fitted with an acid treatment box (523), and the free end of the ion exchange resin column (522) is inserted inside the acid treatment box (523).

6. The dual-lumen dialysis catheter according to claim 1, characterized in that: The catheter body (1) is made of a silicone composite layer (12). The outer surface of the silicone composite layer (12) is provided with an anticoagulant layer (11). The anticoagulant layer (11) is made of heparin coating which binds to a pentasaccharide sequence and antithrombin. The inner surface of the silicone composite layer (12) is provided with an antigel coating (13). The antigel coating (13) is made of polyvinyl alcohol for anti-protein adhesion. The inner side of the antigel coating (13) is provided with a smooth coating (14). The smooth coating (14) is made of polyurethane for reducing the coefficient of friction.

7. A dual-lumen dialysis catheter according to claim 1, characterized in that: The auxiliary main pipe (53) is provided with a sealing component (56) at the end away from the conduit body (1), and a pressure relief valve (57) for reducing the internal air pressure of the auxiliary main pipe (53) is provided on the surface of the sealing component (56).

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