Tube blocking prevention microcatheter system for interventional therapy

Abstract

The invention discloses an anti-blocking microcatheter system for interventional therapy, and relates to the technical field of medical instruments. Comprising a microcatheter body and an operating handle, the micro catheter body is provided with a near end, a far end and a tubular main cavity, a spraying opening is formed in the far end of the main cavity, and the near end of the main cavity is communicated with the operating handle; the lining is arranged at the far end part of the main cavity and can be torn away from the inner wall of the main cavity under the traction effect; the limiting structure is arranged at the position close to the far end of the main cavity and is used for limiting the liner to move forwards during injection and allowing the liner to be released under preset traction force; the traction channel extends into the micro catheter body along the operating handle and is parallel to the main cavity; and one end of the traction piece is connected with the lining, and the other end of the traction piece extends to an external operation part of the operation handle along the traction channel. The invention aims to solve the problem that the microcatheter is easy to block in the interventional therapy, ensure the smooth proceeding of the interventional therapy and reduce the treatment risk and delay caused by the blocking of the microcatheter.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and in particular to an anti-blockage microcatheter system for interventional therapy. Background Technology

[0002] In the field of modern interventional therapy, medical adhesive injection is a crucial treatment method, widely used in the interventional treatment of various vascular diseases and some tumors. Traditional microcatheters, in their structural design and material selection, have not fully considered the special physicochemical properties of medical adhesives. Medical adhesives often have a certain viscosity and are extremely prone to rapid solidification under certain conditions. This causes the viscous substance to easily adhere to and accumulate on the catheter wall when flowing through the catheter lumen. After each injection, a considerable amount of medical adhesive remains inside the catheter. This residual adhesive solidifies rapidly, significantly reducing the catheter's inner diameter, directly preventing subsequent injections and causing blockages. Currently, the general procedure is to remove the microcatheter and replace it with a new one after each injection. If multiple blood vessels need to be treated in a single procedure, frequent microcatheter replacements are necessary. This not only prolongs the operation time and exposes patients to surgical risks for an extended period, but also increases the cost of medical consumables. Furthermore, if the procedure during catheter replacement is not handled carefully, it can easily lead to various complications, seriously threatening the patient's life, health, and surgical prognosis.

[0003] Therefore, developing a microcatheter system that can effectively solve the problem of tube blockage and is compatible with medical adhesive interventional therapy has become an urgent need in the field of interventional therapy. Summary of the Invention

[0004] To address the shortcomings of the existing technology, this invention provides an anti-clogging microcatheter system for interventional therapy, aiming to solve the problem of easy clogging of microcatheters during interventional therapy, ensure the smooth progress of interventional therapy, and reduce the treatment risks and delays caused by microcatheter clogging.

[0005] The specific technical solution is as follows: An anti-occlusion microcatheter system for interventional therapy includes a microcatheter body and an operating handle; the microcatheter body has a proximal end, a distal end, and a tubular main lumen, with an outlet formed at the distal end of the main lumen and the proximal end of the main lumen communicating with the operating handle; it also includes: The liner is located at the distal end of the main cavity and can be torn apart from the inner wall of the main cavity under traction. A limiting structure, located near the distal end of the main cavity, is used to restrict forward movement of the liner during injection and allow release under a predetermined traction force; A sealed storage compartment is located inside the operating handle; The traction channel extends along the operating handle into the microcatheter body and is parallel to the main lumen; A traction component, one end of which is connected to the inner liner, and the other end of which extends along the traction channel to the external operating part of the operating handle; A dynamic sealing component is provided at the traction sealing port on the outer wall of the operating handle. The traction component can move through the dynamic sealing component and the dynamic sealing component maintains an external liquid-gas seal around the traction component. A one-way recovery valve is disposed within the microcatheter body and located on the partition wall between the main lumen and the traction channel, allowing the liner to pass through the traction channel and then self-closing after passing through; The storage compartment inlet valve is fixedly installed inside the operating handle at the interface between the end of the traction channel and the inlet of the sealed storage compartment, allowing the liner to enter the sealed storage compartment and self-resetting to seal after it passes through. When the traction member is pulled, the liner is torn apart from the main cavity after overcoming the limiting structure, and enters the sealed storage chamber in sequence through the one-way recovery valve and the storage chamber inlet valve. The liner is completely stored while the dynamic sealing member keeps it sealed to the outside.

[0006] Furthermore, the dynamic sealing component includes a puncture diaphragm and a multi-lip hemostatic seal arranged in series, wherein the multi-lip hemostatic seal has an adjustable pre-tightening mechanism to compensate for the movement of the traction component.

[0007] Furthermore, in the above scheme, the one-way recovery valve is an elastic diaphragm with a slit, installed in the valve seat hole of the partition wall, and the partition wall forms a guide flare on the side facing the main cavity.

[0008] Furthermore, in the above scheme, the storage compartment inlet valve is a normally closed one-way valve, which is any one of a lip valve, umbrella valve, flanged diaphragm valve or rolling diaphragm inlet structure, and the storage compartment inlet valve is integrally arranged in the internal cavity of the operating handle housing.

[0009] Furthermore, the sealed storage compartment is equipped with a hydrophobic and breathable balance port or a miniature one-way exhaust valve that communicates only with the outside, so as to release the gas inside the compartment without conducting liquid when the liner is introduced.

[0010] Furthermore, in the above scheme, the traction channel is a closed cavity with a low-friction coating on its inner wall, and a scraping ring is provided after the one-way recovery valve to reduce traction resistance and block liquid migration along the traction component.

[0011] Furthermore, in the above scheme, the limiting structure is an annular step shoulder or a fragile connection with controllable fracture.

[0012] Furthermore, the above-mentioned solution includes a transparent viewing window or a transmissive image marker for observing the recovery status inside the sealed storage compartment.

[0013] Furthermore, the inner surface of the main cavity is provided with an anti-adhesion layer, which is formed by impregnation with polytetrafluoroethylene or glucose infusion solution.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: This invention features an inner liner that can be torn off from the inner wall under traction at the distal end of the main lumen of the microcatheter body. A continuous retrieval path consisting of a traction channel, a one-way retrieval valve, and a sealed storage chamber is constructed within the operating handle. At the same time, a dynamic sealing component is set at the traction port. This ensures injection performance and distal support while enabling controllable management of the risk of blockage before and after the event and intraoperative self-repair, reducing instrument replacement and lowering the probability of complications and surgical interruption. Attached Figure Description

[0015] Figure 1 This is an overall schematic diagram of the invention; Figure 2 This is a schematic diagram of the distal structure of the microcatheter body; Figure 3 This is a schematic diagram showing the location of the liner of the distal structure of the microcatheter body; Figure 4 yes Figure 3 Enlarged view of part A in the diagram; Figure 5 This is a schematic diagram of the cross-section of the microcatheter body; Figure 6 This is a schematic diagram of the position and structure of the elastic diaphragm. Figure 7 This is a schematic diagram of the distal structure of the microcatheter body in another embodiment.

[0016] In the attached diagram, 1-microcatheter body, 2-main lumen, 3-ejection outlet, 4-liner, 5-limiting structure, 6-traction channel, 7-traction component, 8-sealed storage chamber, 9-operating handle, 10-dynamic sealing component, 11-elastic diaphragm, 12-injection cylinder, 13-traction cylinder, 14-storage chamber inlet valve. Detailed Implementation

[0017] The embodiments of the invention will be described in further detail below with reference to the accompanying drawings, so that the objectives, technical solutions and technical effects of the invention will be more clearly presented.

[0018] like Figure 1-7 As shown, this invention discloses an anti-occlusion microcatheter system for interventional therapy, comprising a microcatheter body 1 and an operating handle 9, addressing the risk of catheter occlusion at the distal end of the microcatheter during interventional procedures such as catheter embolization due to solidification of the embolic agent, blood coagulation, or powder precipitation. The operating handle 9 includes an injection tube 12 for injecting medical adhesive and a traction tube 13. The traction tube 13 is coaxially arranged with the proximal end of the microcatheter body 1 to ensure smooth traction.

[0019] The microcatheter body 1 has a proximal end, a distal end, and a tubular main lumen 2. The distal end of the main lumen 2 forms an outlet 3, and the proximal end of the main lumen 2 communicates with the operating handle 9. An anti-adhesion layer is provided on the inner surface of the main lumen 2, formed by impregnation with polytetrafluoroethylene or glucose infusion solution. An inner liner 4 is provided at the distal end of the main lumen 2 of the microcatheter body 1. The inner liner 4 can be torn off from the inner wall of the main lumen 2 under traction. A limiting structure 5 is provided near the distal end of the main lumen 2 to restrict the forward movement of the inner liner 4 during injection and allow release under a predetermined traction force. The limiting structure 5 is an annular stepped shoulder or a fragile connection with controllable fracture. To achieve the tearing off of the inner liner 4, a sealed storage chamber 8, a traction channel 6, and a traction component 7 are provided. The sealed storage chamber 8 is located within the operating handle 9 and is used to store the torn-off inner liner 4. The traction channel 6 extends along the operating handle 9 into the microcatheter body 1 and is parallel to the main lumen 2. The traction channel 6 is used to achieve traction after the inner liner 4 is torn off, and is isolated from the main lumen 2 without affecting it. One end of the traction member 7 is connected to the inner liner 4, and the other end extends along the traction channel 6 to the external operating part of the operating handle 9. The external operating part has a hand-cranked winding structure, which facilitates the traction movement of the traction member 7. A one-way recovery valve is provided near the inner liner 4 on the traction member 7. The one-way recovery valve is located inside the microcatheter body 1 and on the partition wall between the main lumen 2 and the traction channel 6. It only allows the inner liner 4 to pass through the traction channel 6 and self-closes after passing through. A storage chamber inlet valve 14 is provided at the interface between the end of the traction channel 6 and the entrance of the sealed storage chamber 8. The storage chamber inlet valve 14 only allows the inner liner 4 to enter the sealed storage chamber 8 and self-resets and seals after passing through. The dynamic sealing component 10 is disposed at the traction sealing port on the outer wall of the operating handle 9. The traction component 7 can move through the dynamic sealing component and the dynamic sealing component maintains an external liquid-gas seal around the traction component 7.

[0020] When the traction member 7 is pulled, the inner liner 4 is torn apart from the main cavity 2 after overcoming the limiting structure 5, and enters the sealed storage chamber 8 in sequence through the one-way recovery valve and the storage chamber inlet valve 14. The inner liner 4 is completely stored while the dynamic sealing member 10 keeps it sealed to the outside.

[0021] In practice, the liner 4 and the inner wall of the main cavity 2 are not bonded together with a large area of ​​strong adhesive. Instead, the axial constraint during the injection stage is mainly borne by the distal limiting structure 5. Before recovery, the residual pressure at the distal end is dissipated using an internal pressure release module to avoid additional adhesion resistance caused by the liquid column or "vacuum cup" effect. Therefore, traction detachment can be completed at a predictable and repeatable low force level.

[0022] The limiting structure 5 is an annular stepped shoulder. The reliable detachment of the liner 4 under traction is achieved by converting axial tension into a uniformly advancing annular peel along the circumference, preventing large-area strong adhesion between the thin-walled liner 4 and the inner wall of the main cavity 2. Only low interfacial energy adhesion and end mechanical thrust are used to achieve stable detachment during injection and low-force detachment during traction. During the injection stage, the distal end face of the liner 4 forms a purely mechanical forward thrust with the annular stepped shoulder machined on the distal inner wall of the main cavity 2, blocking forward movement induced by injection pressure and fluid shear. During the recovery stage, the traction component 7 pulls from the proximal end of the liner 4 until the entire liner 4 is completely separated from the inner wall. It then flows along the main cavity 2 through the one-way recovery valve into the traction channel 6, and after passing through the storage chamber inlet valve 14, enters the sealed storage chamber 8. Through pressure relief, the required traction force can be stably controlled within 1-2N, significantly lower than the safety force level available at the handle end.

[0023] The interface design of the inner liner 4 uses a low surface energy, medically sterilizable film or composite film, such as PTFE, FEP, or PTFE / PI composite, with a thickness of 40-100μm. It naturally adheres to the main cavity 2 circumferentially, avoiding overall thermal fusion bonding. The outer surface of the inner liner 4 maintains low surface energy to reduce the effective contact area. To ensure stable and controllable peeling during traction, a peeling initiation ring is made at the proximal end of the inner liner 4. This can be a ring of tiny barbs / flanges or a shallow circumferential notch of 0.2-0.4mm, which concentrates the tensile force and triggers the leading edge of the annular crack. A reinforcing ring or double-layered overlapping area is set within a 10-15 mm range at the proximal end to facilitate connection with the traction component 7 and to spread the load, avoiding point-load tearing of the film. There is no large-area bonding between the inner liner 4 and the main cavity 2. Generally, no circumferential weak ring or welding is required. Forward thrust is provided by the annular stepped shoulder, and the adhesion is maintained by low interface energy and minimal positive pressure. Further suppression of micro-movement during torsion or swaying during injection is needed. The traction component 7 can be finely adjusted to also serve as a tension limit for the inner liner 4.

[0024] Here, the annular stepped shoulder serves only as a limit and guide, and does not participate in fracture. The geometry and materials must balance thrust reliability and recovery safety. The stepped shoulder is located on the distal inner wall of the main cavity 2, with a 15-25° chamfer on the side facing the main cavity 2 to avoid sharp edges cutting into the liner 4. The step material is the same as the inner wall of the conduit or integrally machined as an insert, such as secondary injection molding or micro-milling on the Pebax / nylon liner 4. The distal flat end face of the liner 4 lightly touches or has a small gap with the stepped shoulder during assembly, forming a purely mechanical thrust. During the injection phase, any forward load is borne by the step. During the traction phase, as the liner 4 moves proximally, the step does not pose an obstacle.

[0025] Here, the traction element 7 is made of a material with good push-pull force transmission and flexural strength in a small-diameter, long passage, such as superelastic nickel-titanium wire with a diameter of 0.10-0.15 mm and a PTFE or hydrophilic coating on the surface to reduce friction; ultra-high molecular weight polyethylene or aramid multi-strand fiber bundles can also be selected. The connection between the traction element 7 and the inner liner 4 adopts a load diffusion structure, and the end of the traction element 7 is fixed to the microring with medical UV adhesive or micro-rivet sleeve. The traction channel 6 is the closed lumen of the microcatheter body 1. A flexible scraping ring is set after the one-way recovery valve. The material can be silicone rubber or polyurethane microlip ring, which is used to scrape off the attached liquid and block the liquid migration along the traction element 7. The external traction port adopts a series of puncture diaphragm + multi-lip hemostatic seal. The hemostatic seal is equipped with an adjustable pre-tightening structure to ensure airtightness to external liquid under reciprocating traction and internal pressure conditions.

[0026] The one-way recovery valve uses an elastic diaphragm 11 with a slit. The valve plate material is selected from medical-grade silicone rubber or fluororubber, and it is made into a cross or Y shape. It is installed in the valve seat hole of the partition wall between the main cavity 2 and the traction channel 6. The partition wall is machined with a flared guide port on the side facing the main cavity 2 to ensure that the curled edge of the inner liner 4 at the peeling front edge can smoothly enter the slit and pass through. After passing through, it immediately closes to achieve fluid isolation between the main cavity 2 and the traction channel 6.

[0027] The inlet valve 14 of the retrieval chamber is a normally closed one-way valve, preferably a lip valve or umbrella valve, made of silicone rubber. The valve body is entirely located inside the handle and is connected to the sealed retrieval chamber 8 at a short distance to reduce the volume of retained fluid. The volume of the sealed retrieval chamber 8 is configured to be 3-5 times the volume of the inner liner 4. The chamber wall is equipped with a hydrophobic and breathable balanced port that communicates only with the outside, using an ePTFE membrane or a miniature one-way exhaust valve to ensure that air is released but not liquid is released when the inner liner 4 enters. The handle shell is equipped with a transparent window or a transmissive image marker for intraoperative confirmation of the retrieval completion status.

[0028] Here, before recovery, the internal pressure release module switches to the pressure relief position to cut off the connection between the Luer lock injection port and the main chamber 2, and connects the main chamber 2 to the small volume release chamber or pressure relief channel, so that the hydrostatic pressure of the distal liquid column and the pressure of the inner liner 4-inner wall interlayer decrease to close to the ambient pressure within 1-2 seconds. The internal pressure release module can be a rotary slide valve or a push-pull mandrel.

[0029] Operationally, during the injection phase, the distal end of the liner 4 is reliably limited by the annular stepped shoulder, preventing it from moving forward. Before retrieval, pressure is released, and traction begins after pressure equilibrium is reached. The peeling front advances steadily from the proximal end, with the stepped shoulder not participating in the fracture and not hindering the curling movement towards the proximal end. After the liner 4 passes through the one-way retrieval valve and the inlet valve 14 of the storage chamber, both valves automatically close, completing the re-isolation of the main cavity 2 from the outside world. Through the combination of annular stepped shoulder limiting, low interface energy bonding, annular peeling, one-way valve retrieval, and pressure release to eliminate the hydraulic lock, the liner 4 achieves low-force, predictable, and externally sealed traction detachment and safe retrieval without relying on weak rings or weld fracture structures.

[0030] In implementation, a peelable liner 4 with a wall thickness of 50-80 μm is placed inside the main lumen 2, 20-30 mm distal to the microcatheter body 1. The material is a thin-walled PTFE or FEP membrane, which is obtained through plasma surface activation and microporous treatment to achieve a controllable tear-off interface. The proximal end of the liner 4 is locally point-connected to the inner wall of the main lumen 2 via a controllable fracture weak connection. The peak traction force of the weak connection fracture is set to 1.2-1.8 N. The distal end is limited by an annular step shoulder to prevent forward displacement during injection. The traction element 7 is a polymer-coated nickel-titanium wire or aramid microbundle with a diameter of 0.10-0.15 mm, and its proximal end exits through the traction sealing port on the outer wall of the handle. The dynamic sealing component 10 adopts a series structure: an outer puncture diaphragm and an inner multi-lip hemostatic seal. The hemostatic seal is equipped with a knob-type adjustable pre-tightening mechanism to compensate for wear and radial clearance changes caused by traction movement. An elastic diaphragm valve 11 with a cross-shaped slit is press-fitted onto the partition wall between the main chamber 2 and the traction channel 6, forming a funnel-shaped guide on the side of the main chamber 2 before the valve. The traction channel 6 is a closed tube with a Parylene C or PTFE low-friction coating sprayed on its inner wall, and a flexible scraping ring is installed after the one-way recovery valve to remove liquid adhering to the surface of the traction component 7. The inlet valve 14 of the storage chamber is a one-piece molded silicone lip valve, which connects to the sealed storage chamber 8 inside the handle. The chamber has a volume of approximately 1.0-1.5 mL, and a 0.2μm hydrophobic ePTFE breathable membrane is integrated on the wall as a balance port. The water inlet pressure is ≥50 kPa. A transparent PC window is provided on the operating handle 9, and the internal pressure release module uses a rotary slide valve to achieve reliable switching between the injection position and the pressure release position. This embodiment was tested in a 37°C saline and iodine contrast agent environment, with no leakage at a maximum working pressure of 300 kPa; after completing the simulated NBCA-iodized oil 1:3 suspension injection, the pressure relief position was switched and about 1.4 N traction was applied, and the liner 4 passed through the valve system continuously and completely entered the storage chamber 8 within 0.8 s, with no visible liquid leakage from the exterior.

[0031] In another implementation, the microcatheter body 1 has an inner diameter of approximately 0.6 mm and is used for high-viscosity embolic agents. The liner 4 is shortened to 10-15 mm distally to minimize internal cavity occupancy, and is made of a polyimide film composite hydrophilic coating to improve guidewire performance. The limiting structure 5 uses a combination of annular stepped shoulders and microgrooves. The one-way recovery valve remains a slit diaphragm valve 11, and the receiving chamber inlet valve 14 uses an umbrella-shaped valve with high opening and closing sensitivity and fast rebound. The inner wall of the traction channel 6 is coated with alternating hydrophilic and hydrophobic microtextures to stabilize the dynamic friction coefficient. The internal pressure release module instantaneously connects the main cavity 2 with the 50-100 μL release cavity at the pressure release position, significantly reducing distal residual pressure. A check valve is configured at the Luer lock injection port to prevent backflow.

[0032] Before the procedure, the main lumen 2 and the internal cavity of the handle are fully pre-flushed, and the working position of the transparent window and release module is confirmed to be the injection position. The Luer lock injection port and syringe are connected, and routine guidewire navigation and positioning are completed. During the injection phase, the liner 4 is stable under the action of the limiting structure 5, and no traction operation is performed. Medical glue is injected as needed for the lesion. When preparing for retrieval, the internal pressure release module is switched to the pressure relief position, and slight aspiration is performed to confirm the dissipation of residual pressure. Then, the module is reset or kept in the pressure relief position and operated as needed. Subsequently, under continuous fluoroscopy or observation through the window, the traction component 7 is pulled evenly, and the traction force gradually increases to exceed the limit release threshold. The liner 4 begins to tear off and continuously passes through the one-way retrieval valve and the storage chamber inlet valve 14 into the sealed storage chamber 8. During the traction process, the traction port of the handle is kept dry and clean, and the dynamic sealing component 10 automatically compensates. When the liner 4 is fully retracted and the traction stroke is in place, traction can be stopped and the traction component 7 can be fixed. If necessary, the main lumen 2 is flushed again to confirm patency, and subsequent treatment can continue or the operation can be terminated. If venting is required throughout the process, it will only rely on the hydrophobic vents of the storage compartment 8 or the miniature one-way vent valve, without going through the externally open liquid passage.

[0033] In this design, a liner 4 with a controllable adhesion-tear-off interface is set at the distal end of the microcatheter and the inner wall of the main lumen 2. During the injection phase, the liner 4 acts as a sacrificial layer to receive the initial contact of the embolic agent, blood and microparticles, and works with the anti-adhesion layer of the main lumen 2 to reduce persistent adhesion and embolism. When it is necessary to restore the patency of the lumen or to implement risk management at the end of the injection, axial traction force is applied by the traction component 7, which sequentially triggers a series of one-way actions: "release of the limiting structure 5 - tearing off of the liner 4 - crossing the one-way recovery valve - crossing the inlet valve 14 of the storage chamber - storage in the sealed storage chamber 8". The one-way recovery valve on the partition wall provides low-threshold opening and rapid closing capability with an elastic slit, ensuring that the main chamber 2 and the traction channel 6 do not form an effective fluid path before and after the liner 4 passes through. The closed lumen and low-friction coating of the traction channel 6 reduce traction resistance and force fluctuations, and the scraping ring prevents adhering liquid from migrating along the traction component 7. The dynamic sealing component 10 located on the outer wall of the handle 9 allows the traction component 7 to continuously stop bleeding and fluid while reciprocating, and the adjustable pre-tightening of the multi-lip seal achieves long-term stable sealing. The sealed storage chamber 8 is self-locking through the normally closed inlet valve 14 and vents through the hydrophobic vent, completely isolating the detached liner 4 and any residual embolic agent it may carry inside the handle 9. The internal pressure release module cuts off the injection path and releases the residual pressure in the main chamber 2 before recovery, avoiding backflow or splashing caused by pressure difference. This principle ensures the one-way, sealed, and visible and controllable nature of the recovery operation.

[0034] The above description is merely a preferred embodiment of the present invention and is not intended to limit the scope of the patent application of the present invention. All equivalent changes, substitutions or modifications made within the technical spirit and principles indicated by the present invention should be included within the scope of patent protection covered by the present invention.

Claims

1. A microcatheter system for interventional therapy to prevent occlusion, comprising a microcatheter body and an operating handle; the microcatheter body having a proximal end, a distal end, and a tubular main lumen, the distal end of the main lumen forming an outlet, and the proximal end of the main lumen communicating with the operating handle; characterized in that, Also includes: The liner is located at the distal end of the main cavity and can be torn apart from the inner wall of the main cavity under traction. A limiting structure, located near the distal end of the main cavity, is used to restrict forward movement of the liner during injection and allow release under a predetermined traction force; A sealed storage compartment is located inside the operating handle; The traction channel extends along the operating handle into the microcatheter body and is parallel to the main lumen; A traction component, one end of which is connected to the inner liner, and the other end of which extends along the traction channel to the external operating part of the operating handle; A dynamic sealing component is provided at the traction sealing port on the outer wall of the operating handle. The traction component can move through the dynamic sealing component and the dynamic sealing component maintains an external liquid-gas seal around the traction component. A one-way recovery valve is disposed within the microcatheter body and located on the partition wall between the main lumen and the traction channel, allowing the liner to pass through the traction channel and then self-closing after passing through; The storage compartment inlet valve is fixedly installed inside the operating handle at the interface between the end of the traction channel and the inlet of the sealed storage compartment, allowing the liner to enter the sealed storage compartment and self-resetting to seal after it passes through. When the traction member is pulled, the liner is torn apart from the main cavity after overcoming the limiting structure, and enters the sealed storage chamber in sequence through the one-way recovery valve and the storage chamber inlet valve. The liner is completely stored while the dynamic sealing member keeps it sealed to the outside.

2. The anti-occlusion microcatheter system for interventional therapy according to claim 1, characterized in that, The dynamic sealing component includes a puncture diaphragm and a multi-lip hemostatic seal arranged in series, the multi-lip hemostatic seal having an adjustable pre-tightening mechanism to compensate for the movement of the traction component.

3. The anti-occlusion microcatheter system for interventional therapy according to claim 1, characterized in that, The one-way recovery valve is an elastic diaphragm with a slit, installed in the valve seat hole of the partition wall, and the partition wall forms a guide flare on the side facing the main cavity.

4. The anti-occlusion microcatheter system for interventional therapy according to claim 1, characterized in that, The storage compartment inlet valve is a normally closed one-way valve, which can be any one of a lip valve, umbrella valve, flanged diaphragm valve or rolling diaphragm inlet structure, and the storage compartment inlet valve is integrally arranged in the internal cavity of the operating handle housing.

5. The anti-occlusion microcatheter system for interventional therapy according to claim 1, characterized in that, The sealed storage compartment is equipped with a hydrophobic and breathable balance port or a miniature one-way exhaust valve that communicates only with the outside, so as to release the gas inside the compartment without conducting liquid when the liner is introduced.

6. The anti-occlusion microcatheter system for interventional therapy according to claim 3, characterized in that, The traction channel is a closed tube with a low-friction coating on its inner wall, and a scraping ring is installed after the one-way recovery valve to reduce traction resistance and block liquid migration along the traction component.

7. The anti-occlusion microcatheter system for interventional therapy according to claim 1, characterized in that, The limiting structure is either an annular stepped shoulder or a fragile connection with controllable fracture.

8. The anti-occlusion microcatheter system for interventional therapy according to claim 1, characterized in that: The operating handle is equipped with a transparent viewing window or a transmission image marker for observing the recovery status inside the sealed storage compartment.

9. The anti-occlusion microcatheter system for interventional therapy according to claim 1, characterized in that, The inner surface of the main cavity is provided with an anti-adhesion layer, which is formed by impregnation of polytetrafluoroethylene or glucose infusion solution.

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