A peritoneal dialysis catheter assembly that prevents fibrin clot occlusion

Abstract

The application discloses a peritoneal dialysis catheter assembly capable of preventing fibrin clot blockage, which comprises a drainage tube and a cleaning rod. The drainage tube is internally provided with an axially extending drainage cavity, and the drainage tube comprises an insertion section and a guide section, and the insertion section is provided with a plurality of drainage holes; the cleaning rod is arranged in the drainage cavity, the cleaning rod is coaxially arranged with the drainage tube, and the cleaning rod is provided with a plurality of blades. By means of the energy of the dialysate flow, the blades guide the local deflection and acceleration of the flow direction, induce continuous turbulence and vortex near the inner wall of the drainage cavity, the shear force in the turbulence area can effectively strip the fibrin clot adhered to the cavity wall, and the stirring action of the vortex prevents the deposition of new clots on the surface of the cavity wall. The arrangement of the plurality of blades can generate vortexes with alternating directions at different axial positions, avoid the single stable mode of the flow field and reduce the scouring efficiency, so that the unobstructed state of the drainage cavity can be maintained for a long time without relying on external power.

Description

Technical Field

[0001] This invention relates to the field of peritoneal dialysis device technology, and more particularly to a peritoneal dialysis catheter assembly that prevents fibrin clot blockage. Background Technology

[0002] Peritoneal dialysis is a kidney replacement therapy that uses the patient's own peritoneum as a semipermeable membrane. This treatment involves the regular injection and exchange of dialysate within the peritoneal cavity, utilizing the solute concentration gradient and osmotic pressure gradient between the peritoneal capillaries and the dialysate to continuously remove retained metabolic waste and excess water from the body.

[0003] During peritoneal dialysis, fibrinogen that leaks from the peritoneal cavity due to aseptic inflammation or physical irritation from the dialysate is converted into fibrin by thrombin, forming flocculent or cord-like clots. These fibrin clots can adhere to and accumulate on the inner wall of the dialysis tubing and at its connections, leading to partial or complete tubing blockage. This can result in slow dialysate drainage, increased infusion resistance, and even complete tubing obstruction and dialysis interruption. It may also induce adverse consequences such as abdominal pain, turbid drainage fluid, and catheter dysfunction. Summary of the Invention

[0004] In order to overcome the shortcomings of the prior art, the present invention aims to provide a peritoneal dialysis catheter assembly that prevents fibrin clot blockage, thereby solving the problem of fibrin clot blockage of the catheter.

[0005] The objective of this invention is achieved through the following technical solution:

[0006] A peritoneal dialysis catheter assembly for preventing fibrin clot blockage includes:

[0007] A drainage tube, wherein the drainage tube has an axially extending drainage cavity inside, the drainage tube includes an insertion section and a guide section, the insertion section is used to insert into the human peritoneum, the insertion section is provided with multiple drainage holes, the multiple drainage holes are connected to the drainage cavity and the external environment;

[0008] A cleaning rod is disposed inside the drainage cavity and is coaxially arranged with the drainage tube. The cleaning rod is provided with multiple blades, which are used to generate turbulence or eddies in the dialysate near the inner wall of the drainage cavity, thereby flushing away the fibrin clots attached to the inner wall of the drainage cavity.

[0009] Furthermore, the drainage holes are spaced apart along the circumference and / or axial direction of the drainage tube; the inner wall of the drainage tube and the surface of the cleaning rod are both provided with an anti-coagulation coating.

[0010] Furthermore, the drainage tube is provided with a movable connecting seat, which is located at one end of the insertion section. The cleaning rod is provided with a movable connecting member at one end near the movable connecting seat. The movable connecting seat and the movable connecting member are rotatably connected so that the cleaning rod can rotate relative to the drainage tube.

[0011] Furthermore, the side wall of the drainage tube is provided with an operating groove that penetrates the tube wall. The operating groove connects the drainage cavity and the external environment. The cleaning rod is provided with a control rod that passes through the operating groove and extends to the outside of the drainage tube.

[0012] Furthermore, the cleaning rod is provided with a baffle that slidably seals against the inner wall of the drainage tube. The baffle is arranged around the control rod to prevent the dialysate in the drainage chamber from leaking to the outside of the drainage tube through the operating groove.

[0013] Furthermore, a hydrophobic coating is provided on the surface of the baffle that abuts against the inner wall of the drainage tube, and the hydrophobic coating is used to further prevent the dialysate from leaking along the operating tank.

[0014] Furthermore, an elastic element is provided between the movable connecting seat and the movable connecting member, and the elastic element has a tendency to move the cleaning rod away from the movable connecting seat.

[0015] Furthermore, the cleaning rod is provided with multiple cleaning rods, and the multiple cleaning rods are correspondingly arranged with the multiple drainage holes. The cleaning rods are accommodated in the drainage holes, and the ends of the cleaning rods do not exceed the outer wall of the drainage tube. The cleaning rods are components made of flexible material.

[0016] Furthermore, the multiple blades are spirally spaced along the axial direction of the cleaning rod, and the blades are staggered relative to each other in the axial direction.

[0017] Furthermore, the operating groove extends spirally along the circumference and axial direction of the drainage tube, so that when the control lever moves along the operating groove, the cleaning rod simultaneously generates rotational motion and axial movement relative to the drainage tube.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0019] 1. The drainage tube has an axially extending drainage cavity inside. The drainage tube includes an insertion section and a guide section. The insertion section is inserted into the peritoneum and has multiple drainage holes that connect the drainage cavity to the external environment. This redundant design, allowing simultaneous drainage from different locations within the abdominal cavity, ensures that even if some drainage holes become blocked with fibrin clots, the remaining holes remain open. The negative pressure within the drainage cavity automatically redistributes the fluid flow to the unblocked holes, thus preventing drainage interruption due to blockage of a single hole.

[0020] 2. The cleaning rod is located within the drainage chamber and is coaxially arranged with the drainage tube. The cleaning rod has multiple blades, which are used to generate turbulence or eddies in the dialysate near the inner wall of the drainage chamber, thereby flushing away fibrin clots attached to the inner wall of the drainage chamber. Relying on the energy of the dialysate's own flow, the blades guide the flow direction to locally deflect and accelerate, inducing continuous turbulence and eddies near the inner wall of the drainage chamber. The shear force in the turbulent region can effectively peel off the fibrin clots already attached to the chamber wall and break them down so that they can be discharged with the flow of liquid, while the agitation of the eddies prevents the deposition of new clots on the surface of the chamber wall.

[0021] 3. The cleaning rod is located within the drainage cavity and is coaxially arranged with the drainage tube. The cleaning rod has multiple blades, which generate turbulence or eddies in the dialysate near the inner wall of the drainage cavity, thereby flushing away fibrin clots adhering to the inner wall of the drainage cavity. The coaxial arrangement of the cleaning rod and the drainage tube ensures a uniform gap between the blades and the inner wall of the tube, allowing the flushing action to cover the entire circumference without dead angles. At the same time, the arrangement of multiple blades can generate vortices with alternating directions at different axial positions, avoiding a single stable flow field that would reduce flushing efficiency. Thus, the drainage cavity can be kept unobstructed for a long time without relying on external power. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the peritoneal dialysis catheter assembly for preventing fibrin clot blockage according to the present invention;

[0023] Figure 2 for Figure 1 The three-dimensional sectional view shown;

[0024] Figure 3 for Figure 1 The sectional view shown.

[0025] In the diagram: 1. Drainage tube; 101. Insertion section; 102. Guide section; 2. Drainage cavity; 3. Drainage hole; 4. Cleaning rod; 5. Blade; 6. Movable connecting seat; 7. Movable connecting piece; 8. Operating slot; 9. Control lever; 10. Baffle; 11. Elastic element; 12. Cleaning rod. Detailed Implementation

[0026] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0027] It should be noted that when an element is described as being "fixed to" another element, it can be directly attached to the other element or there may be an intervening element. When an element is described as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementations.

[0028] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0029] See Figures 1-3 A preferred embodiment of the present invention provides a peritoneal dialysis catheter assembly for preventing fibrin clot blockage, comprising: a drainage tube 1 and a cleaning rod 4.

[0030] The drainage tube 1 has an axially extending drainage cavity 2 inside. The drainage tube 1 includes an insertion section 101 and a guide section 102. The insertion section 101 is inserted into the peritoneum and has multiple drainage holes 3. These drainage holes 3 connect the drainage cavity 2 to the external environment. The portion of the insertion section 101 located within the peritoneal cavity has multiple drainage holes 3 distributed circumferentially and axially along its wall. These drainage holes 3 directly connect the drainage cavity 2 to the peritoneal cavity environment, allowing dialysate accumulated in the peritoneal cavity to flow into the drainage cavity 2 through the drainage holes 3 and drain out along the guide section 102. The multiple drainage holes 3 are arranged in a staggered pattern, allowing simultaneous aspiration of fluid from different heights and angles within the peritoneal cavity, preventing complete failure of a single hole due to fibrin clot adhesion. The cross-sectional area of ​​the drainage cavity 2 is larger than the size of fibrin flocs that may form under conventional dialysate flow rates, thus allowing a small amount of clots to pass through with the fluid flow without obstruction. When fibrin clots adhere to a drainage hole 3, the negative pressure within the drainage cavity 2 rapidly distributes the fluid flow to the unblocked holes, maintaining overall drainage continuity, as the other holes remain open. Simultaneously, the smooth inner surface of the insertion section 101 reduces the likelihood of clot adhesion. Through the synergistic effect of redundant aspiration and a large-diameter smooth flow channel, the risk of catheter obstruction caused by fibrin clots is significantly reduced.

[0031] A cleaning rod 4 is disposed within the drainage cavity 2, coaxially arranged with the drainage tube 1. The cleaning rod 4 has multiple blades 5, which generate turbulence or eddies in the dialysate near the inner wall of the drainage cavity 2, thereby flushing away fibrin clots adhering to the inner wall. As the dialysate flows through, the blades 5 guide the flow direction to locally deflect and accelerate, inducing continuous turbulence or eddies near the inner wall of the drainage cavity 2. The shear force in the turbulent region effectively strips away the fibrin clots already attached to the cavity wall, suspending them in the dialysate as fragments and allowing them to be discharged with the flow. Simultaneously, the agitation of the eddies prevents the deposition of newly formed clots on the cavity wall surface. The coaxial arrangement of the cleaning rod 4 and the drainage tube 1 ensures a uniform gap between the blades 5 and the inner wall of the tube, allowing the flushing effect to cover the entire circumferential direction without dead zones. The arrangement of multiple blades 5 generates alternating vortices at different axial positions, avoiding a single stable flow pattern that would reduce flushing efficiency. When fibrin flocs begin to adhere to the inner wall of the drainage chamber 2, the local turbulence formed by the flowing dialysate under the guidance of the blade 5 will continuously impact this area, causing the clots to be detached before they can form a firm adhesion. The cleaning rod 4 itself does not rely on external power and relies entirely on the flow energy of the drainage fluid to achieve its self-cleaning function, thereby maintaining the unobstructed state of the drainage chamber 2 for a long time without increasing the complexity of operation.

[0032] Working principle: The drainage tube 1 has an axially extending drainage cavity 2 inside. Multiple staggered drainage holes 3 are distributed circumferentially and axially along the wall of its insertion section 101. The cross-sectional area of ​​the drainage cavity 2 is larger than the size of conventional fibrin flocculent material, and the inner wall of the insertion section 101 is smoothed. Multiple drainage holes 3 simultaneously draw dialysate from different heights and angles within the abdominal cavity. When a clot adheres to a hole, the remaining open holes redistribute the fluid flow under the negative pressure within the cavity, maintaining drainage continuity. Simultaneously, the sufficiently large cavity diameter allows a small amount of clot to pass through with the fluid flow without jamming, and the smooth inner wall reduces the probability of clot adhesion. Thus, the redundant porosity and large-diameter channel work together to reduce the risk of blockage. A cleaning rod 4 is coaxially mounted within the drainage cavity 2, with multiple blades 5 distributed around its outer periphery. The blades 5 are alternately arranged axially and maintain a uniform gap with the inner wall of the tube. Driven by the flow energy of the dialysate itself, the blade 5 causes local deflection and acceleration of the flow direction, inducing continuous turbulence and eddies near the inner wall of the drainage chamber 2. The shear force in the turbulent region peels off the attached fibrin clots, breaking them down and discharging them with the flow. The eddies prevent the deposition of new clots. Furthermore, the blade 5 generates vortices with alternating directions at different axial positions, avoiding a uniform flow field and achieving continuous self-cleaning of the inner wall without dead angles.

[0033] Clearly, the redundant design of multiple drainage holes 3 simultaneously draining from different locations within the abdominal cavity ensures that even when individual drainage holes 3 become adhered to by fibrin clots, the remaining holes remain unobstructed. The negative pressure within the drainage cavity 2 automatically redistributes the fluid flow to unblocked holes, thus preventing the entire drainage process from being interrupted due to blockage of a single hole. Relying on the energy of the dialysate's own flow, the blades 5 guide the fluid flow direction to undergo local deflection and acceleration, inducing continuous turbulence and eddies near the inner wall of the drainage cavity 2. The shear force in the turbulent region effectively peels off the fibrin clots already attached to the cavity wall and disintegrates them before they are discharged with the fluid flow, while the agitation of the eddies prevents the deposition of new clots on the cavity wall surface. The coaxial arrangement of the cleaning rod 4 and the drainage pipe 1 ensures that the gap between the blade 5 and the inner wall of the pipe is uniform and consistent, so that the flushing action covers the entire circumference without dead angles. At the same time, the arrangement of multiple blades 5 can generate vortices with alternating directions at different axial positions, avoiding the occurrence of a single stable mode in the flow field and reducing the flushing efficiency. Thus, the drainage cavity 2 can be kept open for a long time without relying on external power.

[0034] In this embodiment, preferably, the drainage holes 3 are spaced apart along the circumference and / or axial direction of the drainage tube 1; the inner wall of the drainage tube 1 and the surface of the cleaning rod 4 are both provided with an anticoagulant coating. This arrangement structure makes the drainage holes 3 spatially staggered, thereby effectively avoiding multiple holes being blocked by fibrin clots at the same time. Even if some holes are temporarily ineffective due to local flocculent adhesion, the holes in other directions can still continue to drain, ensuring uniform negative pressure distribution in the drainage cavity 2 and that the fluid flow path is not interrupted. The inner wall of the drainage tube 1 and the surface of the cleaning rod 4 are both provided with an anticoagulant coating. This coating can inhibit the adsorption and transformation of fibrinogen at the contact interface, reduce the nucleation sites of clots, and thus delay the initial adhesion process of clots on the flow channel surface. The coating can be a heparin-grafted coating to inhibit thrombin generation; a polyethylene glycol hydrophilic coating to reduce protein adsorption; or a phosphorylcholine-mimicking cell membrane coating to prevent fibrinogen adhesion. The smoothness of the inner wall of the drainage tube 1, combined with the synergistic effect of the anti-coagulation coating, makes it difficult for even a small amount of fibrin flocculent material to adhere firmly to the wall surface even if it enters the drainage cavity 2. Meanwhile, the anti-coagulation coating on the surface of the cleaning rod 4 prevents clot accumulation within the gaps between the blades 5, maintaining the guiding efficiency of the blades 5 for the liquid flow. By reducing the probability of synchronous blockage through a porous, spaced distribution, and further reducing clot formation and adhesion at the material level with a double-surface anti-coagulation coating, the overall anti-fibrin clot blockage performance of the drainage tube 1 is significantly improved.

[0035] In this embodiment, preferably, the drainage tube 1 is provided with a movable connecting seat 6, which is located at one end of the insertion section 101. The cleaning rod 4 has a movable connecting member 7 at one end near the movable connecting seat 6. The movable connecting seat 6 and the movable connecting member 7 are rotatably connected, allowing the cleaning rod 4 to rotate relative to the drainage tube 1. The movable connecting seat 6 at the end of the drainage tube 1 and the movable connecting member 7 at the end of the cleaning rod 4 form a rotatable connection, allowing the cleaning rod 4 to rotate freely relative to the drainage tube 1. When the dialysate flows through the drainage cavity 2 and drives the blades 5 to generate turbulence, the rotation of the cleaning rod 4 can dynamically change the scouring direction of the blades 5, preventing the liquid flow from impacting the same area of ​​the inner wall at a fixed angle, thereby expanding the coverage of the turbulent stripping effect and improving the uniformity of scouring. Simultaneously, the rotation of the cleaning rod 4 can cause the stripped fibrin clot debris to move out of the drainage cavity 2 more quickly with the liquid flow, reducing the chance of secondary accumulation in the gaps between the blades 5 or near the drainage holes 3. In cases with significant fibrin clots, the operator can manually rotate the cleaning rod 4 for auxiliary cleaning. External force drives the rod to rotate, causing the blades 5 to actively scrape or agitate the inner wall deposits with greater torque and more flexible angles, thus thoroughly removing stubborn clots and compensating for the insufficient flushing force when relying solely on liquid flow self-drive. This dual-mode rotation mechanism, combining manual and liquid flow drive, ensures continuous automatic cleaning of daily drainage while providing enhanced intervention when clot load is high, significantly improving the adaptability of the drainage tube 1 to complex operating conditions and its long-term unobstructed reliability.

[0036] In this embodiment, preferably, the side wall of the drainage tube 1 is provided with an operating groove 8 that penetrates the tube wall. The operating groove 8 connects the drainage cavity 2 and the external environment. The cleaning rod 4 is provided with a control rod 9, which passes through the operating groove 8 and extends to the outside of the drainage tube 1. The operator can directly control the control rod 9 from the outside without disassembling or interrupting the drainage, thereby driving the cleaning rod 4 to move axially or rotate circumferentially relative to the drainage tube 1. When there is a large accumulation of fibrin clots in the drainage cavity 2 or the self-driving cleaning effect of the liquid flow alone is insufficient, the external pushing and pulling of the control rod 9 can drive the blade 5 to scrape the inner wall axially, peeling the long strips or sheet-like clots from the drainage hole 3 and the tube wall; rotating the control rod 9 can cause the blade 5 to generate torsional shear force, effectively destroying the annularly attached fibrin layer. Repeated pushing, pulling and rotating combined operations can also create a pulsating flushing flow in the drainage cavity 2, further dispersing loose flocculents and promoting their discharge with the dialysate. The edge of the operating groove 8 can be equipped with a flexible sealing lip or elastic gasket to prevent leakage of peritoneal fluid while ensuring smooth sliding of the control lever 9. The external control design significantly compensates for the insufficient flushing force in the self-driven fluid flow mode, enabling the cleaning lever 4 to perform automatic daily cleaning as well as active intervention by medical staff when the blockage worsens. This greatly improves the adaptability of the drainage tube 1 to various fibrin clot loads and its long-term patency and reliability.

[0037] In this embodiment, preferably, the cleaning rod 4 is provided with a baffle 10, which slidably seals against the inner wall of the drainage tube 1. The baffle 10 is arranged around the control rod 9 to prevent the dialysate in the drainage cavity 2 from leaking to the outside of the drainage tube 1 through the operating groove 8. When the control rod 9 is axially pushed or circumferentially rotated, the baffle 10 always remains in contact with the inner wall of the drainage tube 1 and moves synchronously with the cleaning rod 4, effectively preventing the dialysate in the drainage cavity 2 from leaking to the outside of the drainage tube 1 through the operating groove 8, thus avoiding environmental pollution or infection risks caused by the overflow of peritoneal exudate. At the same time, the sealing effect of the baffle 10 maintains the negative pressure stability in the drainage cavity 2, ensuring that the drainage process is not disturbed by the entry of external gas, thereby ensuring the continuity of drainage efficiency. In addition, the baffle 10 can automatically scrape off the fibrin flocculent material remaining on the inner wall of the drainage tube 1 during the sliding process, preventing these deposits from being carried into the gap of the operating groove 8 as the control rod 9 moves, causing jamming or sealing failure, further improving the reliability of long-term use. This structure allows the cleaning rod 4 to be externally controlled while maintaining the integrity and airtightness of the drainage system, thus balancing active cleaning function with clinical operation safety.

[0038] In this embodiment, preferably, a hydrophobic coating is provided on the surface of the baffle 10 that abuts against the inner wall of the drainage tube 1. This hydrophobic coating is used to further prevent the dialysate from leaking along the operating tank 8. The hydrophobic coating on the surface of the baffle 10 that abuts against the inner wall of the drainage tube 1 significantly enhances the sealing performance of the interface between the baffle 10 and the tube wall. Due to the low surface energy characteristics of the hydrophobic material, the dialysate forms a large contact angle when it contacts the coating surface, making it difficult to wet and penetrate into the tiny gap between the baffle 10 and the tube wall, thereby effectively preventing the liquid from leaking outward along the operating tank 8. Even if the mechanical seal pressure decreases due to wear during long-term sliding of the baffle 10, the hydrophobic coating can still provide an additional barrier due to its droplet repulsion effect, allowing the dialysate to be pushed back to the drainage chamber 2 before reaching the opening of the operating tank 8. In addition, the coating reduces the coefficient of friction between the baffle 10 and the tube wall, making the sliding of the control lever 9 smoother, reducing the risk of particulate contamination caused by friction, and extending the service life of the sealing structure. The hydrophobic coating, combined with the elastic seal of the baffle 10, forms a solid-liquid dual-phase leak-proof mechanism, which not only ensures the airtightness of the drainage system but also improves the reliability and durability of the external control cleaning rod 4.

[0039] In this embodiment, preferably, an elastic element 11 is provided between the movable connecting seat 6 and the movable connecting member 7. The elastic element 11 has a tendency to move the cleaning rod 4 away from the movable connecting seat 6. When the dialysate is injected into the drainage cavity 2, the kinetic energy of the liquid flow acts on the cleaning rod 4 and its blades 5, causing the cleaning rod 4 to overcome part of the elastic force of the elastic element 11 and generate a reciprocating motion along the axial direction. This reciprocating motion drives the blades 5 to repeatedly scrape the fibrin clots on the inner wall of the drainage cavity 2 and the edge of the drainage hole 3, effectively enhancing the mechanical stripping effect. At the same time, the elastic resistance of the elastic element 11 forms a reaction effect on the liquid flow, which can absorb part of the impact energy in the initial stage of dialysate injection, avoiding the liquid from suddenly rushing into the peritoneal cavity at an excessively high flow rate and causing stimulation or damage to the peritoneal tissue, thus playing a buffering and protective role. This achieves the dual functions of adaptive anti-clogging cleaning and smooth fluid delivery, significantly improving the safety and cleaning efficiency of the drainage system during the perfusion stage. When the cleaning rod 4 moves back and forth axially under the action of fluid kinetic energy, the blades 5 cut the fluid flow with dynamically changing angles of attack. This variable angle of attack motion causes the vortex scale and shedding frequency generated at the trailing edge of the blades 5 to change periodically, thus forming a turbulent pulsating field with alternating intensity near the inner wall of the drainage cavity 2. At the same time, the guiding surface of the blades 5 itself continuously changes the outlet direction of the fluid flow during the reciprocating motion, causing the scouring flow to be superimposed in both axial reciprocating and circumferential rotational dimensions, forming a spiral-propelling sweeping effect. This forces the fibrin flocculent material already attached to the surface of the blades 5 to fall off due to inertial force, restoring the guiding efficiency of the blades 5. The turbulence induced by the blades 5, in turn, enhances the self-cleaning effect on the surface of the cleaning rod 4, preventing the accumulation of clumps on the rod body that would cause motion stagnation. This dynamic coupling of reciprocating movement and fluid guidance allows the two cleaning mechanisms, mechanical scraping and hydraulic flushing, to be alternately strengthened in the same working cycle, avoiding the existence of cleaning blind spots under a single action mode, and achieving efficient coverage of the inner wall of the drainage cavity 2 in the entire circumference and axial direction.

[0040] In this embodiment, preferably, the cleaning rod 4 is provided with multiple cleaning rods 12, which are correspondingly arranged with multiple drainage holes 3. The cleaning rods 12 are accommodated within the drainage holes 3, and the ends of the cleaning rods 12 do not extend beyond the outer wall of the drainage tube 1. The cleaning rods 12 are components made of flexible material. When the cleaning rod 4 moves axially or rotates circumferentially within the drainage cavity 2, the cleaning rods 12 oscillate within the drainage holes 3, thereby continuously scraping away fibrin clots attached to the inner wall and edge of the drainage holes 3, effectively clearing the drainage holes 3 and preventing blockage. Since the ends of the cleaning rods 12 never extend beyond the outer wall of the drainage tube 1, friction or puncture damage to the peritoneal tissues by protrusions is avoided, ensuring biosafety in clinical use. The flexible material allows the cleaning rods 12 to adapt to the slight bending or deformation of the drainage holes 3, and to produce elastic flexing when encountering stubborn clots, maintaining effective scraping force without easily getting stuck. Simultaneously, the movement of the cleaning rod 12 within the hole actively disturbs the local fluid flow, disrupting the stagnant zone of flocculent deposits and prompting suspended clumps to be drawn into the drainage chamber 2, thereby further enhancing the anti-clogging capability of the drainage hole 3. This structure extends active cleaning to the interior of each drainage hole 3, achieving precise unblocking from the source of blockage and significantly enhancing the long-term patency and tissue compatibility of the drainage system.

[0041] In this embodiment, preferably, the multiple blades 5 are spirally spaced along the axial direction of the cleaning rod 4, and the blades 5 are staggered relative to each other in the axial direction. When the dialysate flows axially, the upstream blade 5 guides the flow to generate an initial deflection, while the downstream staggered blade 5 captures the uncovered streamline region upstream, thereby generating a turbulent and vortex field that is uniformly distributed along the entire axial direction and has no overlapping dead angles in the circumferential direction near the inner wall of the drainage cavity 2. Because the blades 5 are staggered relative to each other in the axial direction, the vortex shedding phases generated by adjacent blades 5 are different, and the vortex systems interfere with and break up with each other, further enhancing the turbulence intensity and significantly improving the flushing and stripping efficiency of fibrin clots attached to the tube wall. At the same time, the spiral spacing distribution ensures that each blade 5 cuts into the flow with a gradually changing angle of attack when the cleaning rod 4 rotates, avoiding the periodic hydraulic impact caused by the blades 5 entering the same flow state at the same time, and reducing the vibration and noise of the cleaning rod 4. This spiral misalignment structure enables the cleaning rod 4 to achieve efficient coverage flushing of the entire inner wall of the drainage cavity 2 without increasing the liquid flow velocity or the number of blades 5, through optimized spatial arrangement, effectively improving the uniformity and continuity of self-cleaning ability.

[0042] In this embodiment, preferably, the operating groove 8 extends spirally along the circumference and axial direction of the drainage pipe 1, so that when the control rod 9 moves along the operating groove 8, the cleaning rod 4 simultaneously generates rotational motion and axial movement relative to the drainage pipe 1. When the control rod 9 moves along the operating groove 8, the cleaning rod 4 simultaneously generates rotational motion and axial movement relative to the drainage pipe 1, forming a compound spatial motion trajectory. This compound motion causes the blades 5 on the cleaning rod 4 to sweep the inner wall of the drainage cavity 2 in a spiral propulsion manner. The cutting direction of the blades 5 continuously changes, effectively avoiding the liquid flow from impacting the same area at a fixed angle, thereby significantly expanding the coverage of the turbulent stripping effect. At the same time, during the rotation, the cleaning rod 4 drives the sweeping rod 12 to generate a torsional motion in the drainage hole 3, performing multi-dimensional scraping of the inner wall of the hole, reducing the probability of fibrin clots accumulating in the drainage hole 3. The compound motion also causes the stripped clot debris to be subjected to the dual action of axial thrust and circumferential centrifugal force, accelerating its discharge from the drainage cavity 2 and reducing the chance of secondary adhesion. The operator can control the movement of two degrees of freedom simultaneously through a single push-pull motion, simplifying the complexity of manual intervention.

[0043] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of those different embodiments or examples.

[0044] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0045] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any person skilled in the art can easily conceive of various variations or substitutions within the technical scope disclosed in this application, and these should all be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A peritoneal dialysis catheter assembly for preventing fibrin clot blockage, characterized in that, include: The drainage tube (1) has an axially extending drainage cavity (2) inside. The drainage tube (1) includes an insertion section (101) and a guide section (102). The insertion section (101) is used to insert into the peritoneum of a human body. The insertion section (101) is provided with multiple drainage holes (3). The multiple drainage holes (3) connect the drainage cavity (2) with the external environment. Cleaning rod (4) is located in drainage cavity (2). The cleaning rod (4) is coaxially arranged with the drainage tube (1). The cleaning rod (4) is provided with multiple blades (5). The blades (5) are used to generate turbulence or eddies in the dialysate near the inner wall of the drainage cavity (2), thereby flushing the fibrin clots attached to the inner wall of the drainage cavity (2).

2. The peritoneal dialysis catheter assembly for preventing fibrin clot blockage according to claim 1, characterized in that, The drainage holes (3) are distributed at intervals along the circumference and / or axial direction of the drainage tube (1); the inner wall of the drainage tube (1) and the surface of the cleaning rod (4) are both provided with an anti-condensation coating.

3. The peritoneal dialysis catheter assembly for preventing fibrin clot blockage according to claim 1, characterized in that, The drainage tube (1) is provided with a movable connecting seat (6), which is located at one end of the insertion section (101). The cleaning rod (4) is provided with a movable connecting piece (7) at one end near the movable connecting seat (6). The movable connecting seat (6) and the movable connecting piece (7) are rotatably connected so that the cleaning rod (4) can rotate relative to the drainage tube (1).

4. A peritoneal dialysis catheter assembly for preventing fibrin clot blockage according to claim 3, characterized in that, The side wall of the drainage tube (1) is provided with an operating groove (8) that penetrates the tube wall. The operating groove (8) connects the drainage cavity (2) and the external environment. The cleaning rod (4) is provided with a control rod (9). The control rod (9) passes through the operating groove (8) and extends to the outside of the drainage tube (1).

5. A peritoneal dialysis catheter assembly for preventing fibrin clot blockage according to claim 4, characterized in that, The cleaning rod (4) is provided with a baffle (10), which is slidably sealed against the inner wall of the drainage tube (1). The baffle (10) is arranged around the control rod (9) to prevent the dialysis fluid in the drainage chamber (2) from leaking to the outside of the drainage tube (1) through the operation tank (8).

6. A peritoneal dialysis catheter assembly for preventing fibrin clot blockage according to claim 5, characterized in that, A hydrophobic coating is provided on the surface of the baffle (10) that abuts against the inner wall of the drainage tube (1), and the hydrophobic coating is used to further prevent the dialysate from leaking along the operating tank (8).

7. A peritoneal dialysis catheter assembly for preventing fibrin clot blockage according to claim 3, characterized in that, An elastic element (11) is provided between the movable connecting seat (6) and the movable connecting member (7), and the elastic element (11) has a tendency to move the cleaning rod (4) away from the movable connecting seat (6).

8. A peritoneal dialysis catheter assembly for preventing fibrin clot blockage according to claim 1, characterized in that, The cleaning rod (4) is provided with multiple cleaning rods (12), and the multiple cleaning rods (12) are correspondingly arranged with the multiple drainage holes (3). The cleaning rods (12) are accommodated in the drainage holes (3), and the ends of the cleaning rods (12) do not exceed the outer wall of the drainage tube (1). The cleaning rods (12) are components made of flexible materials.

9. A peritoneal dialysis catheter assembly for preventing fibrin clot blockage according to claim 1, characterized in that, Multiple blades (5) are spirally spaced along the axial direction of the cleaning rod (4), and the blades (5) are staggered relative to each other in the axial direction.

10. A peritoneal dialysis catheter assembly for preventing fibrin clot blockage according to claim 4, characterized in that, The operating groove (8) extends spirally along the circumference and axial direction of the drainage pipe (1) so that when the control lever (9) moves along the operating groove (8), the cleaning rod (4) simultaneously generates rotational motion and axial movement relative to the drainage pipe (1).

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