Suction device

Abstract

The invention provides a suction device which comprises a catheter part and a telescopic part, and the telescopic part is movably arranged in the catheter part in a penetrating mode. The telescopic part at least has a compressed state in which the telescopic part is arranged in the catheter part and an expanded state in which the far end is separated from the catheter part; in the expansion state, the part, except the far end, of the telescopic part is attached to the catheter part, and the far end of the telescopic part moves to the target tissue so as to suck the target tissue. The device can penetrate through a thin and tortuous blood vessel to reach the far end of the blood vessel, so that the success rate of large-size thrombus suction is increased, and the escape risk of thrombus can be reduced.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and in particular to an aspiration device for aspirating blood clots. Background Technology

[0002] Aspiration devices are used to remove blood clots from human blood vessels. The aspiration device can be accessed via the femoral artery or radial artery. After access, the distal end of the catheter is advanced along the blood vessel to the location of the blood clot. Simultaneously, an aspiration pump or syringe is connected to the proximal end of the external catheter, and negative pressure is applied to the proximal end of the catheter to aspirate the blood clot into the catheter. The catheter and the blood clot are then withdrawn from the body together, restoring patency to the blood vessel.

[0003] In cases involving complex blood vessels with narrow diameters, reaching the lesion site via catheter can be challenging. While large-lumen catheters offer better aspiration performance and reduce the risk of endovascular obstruction, they often struggle to reach lesions distal to smaller vessels. Conversely, small-lumen catheters, with their smaller aspiration port area and weaker suction force, often fail to aspirate larger thrombi, potentially allowing them to escape into other distal vessels.

[0004] To address the above pain points, there is an urgent need to develop an aspiration device that can smoothly pass through tortuous blood vessels to reach the thrombus location and can aspirate large thrombi, in order to solve the problems in existing technologies where large-lumen catheters cannot reach distant thrombus locations, and small-lumen catheters are difficult to aspirate and have a high escape rate. Summary of the Invention

[0005] To address the technical problems existing in the prior art, the present invention aims to provide a suction device that can pass through thinner and more tortuous blood vessels to reach the distal end of the blood vessel, thereby improving the success rate of large-sized thrombus aspiration and reducing the risk of thrombus escape.

[0006] To achieve the above objectives, the present invention provides a suction device, including a conduit portion and a telescopic portion, the telescopic portion being movably inserted within the conduit portion; the telescopic portion having at least a compressed state within the conduit portion and an expanded state after its distal end is detached from the conduit portion; in the expanded state, the portion of the telescopic portion other than its distal end abuts against the conduit portion, and the distal end of the telescopic portion moves to the target tissue to suction the target tissue.

[0007] Optionally, the conduit includes an inner tube and an outer tube, the inner tube being movably inserted into the outer tube, and the telescopic part being movably inserted into the inner tube;

[0008] The distal end of the telescopic portion can move to the target tissue after extending out of the outer tube; the inner tube is used to move proximally relative to the telescopic portion until the distal end of the telescopic portion expands and the portion of the telescopic portion other than the distal end abuts against the outer tube.

[0009] Optionally, the telescopic part includes a mesh-like support, which can be compressed by the inner tube and can automatically expand after the restraints of the inner tube and the outer tube are removed; after the support is freed from the restraints of the inner tube, the distal end of the support abuts against the inner wall of the predetermined pipeline, and the proximal end of the support is restrained in the outer tube.

[0010] Optionally, the telescopic part further includes an actuating member, which is movably inserted into the inner tube. The distal end of the actuating member is connected to the proximal end of the support, and the proximal end of the actuating member extends out of the proximal end of the inner tube. The actuating member is used to drive the support to move within the inner tube.

[0011] Optionally, the actuating element is a filament, and the number of filaments is at least one. The filament can be pushed or pulled to drive the support to move.

[0012] Optionally, the surface of the support is provided with a film, which at least covers the portion of the support extending out of the outer tube in the expanded state.

[0013] Optionally, in the expanded state, the proximal end of the membrane abuts against the end of the outer tube.

[0014] Optionally, the support is woven from a plurality of braided filaments, at least a portion of which are radiopaque filaments.

[0015] Optionally, the inner tube is provided with an opening for a guide wire to pass through; the guide wire is used to pass through the opening into the inner tube and extend out of the distal end of the inner tube, and the inner tube is used to move on the guide wire.

[0016] Optionally, the inner wall of the outer tube is provided with a receiving groove, and the telescopic part is provided with a limiting member; the limiting member can be placed in the receiving groove to limit the movement distance of the telescopic part relative to the outer tube.

[0017] Optionally, the inner tube includes a first section and a second section connected sequentially from the proximal end to the distal end along its own axial direction, wherein the hardness of the first section is greater than that of the second section; the distal end of the second section is a spring structure, and the length of the spring structure in the extension direction of the inner tube is 5mm to 50mm.

[0018] Optionally, the inner tube includes an inner layer, a middle layer, and an outer layer nested from the inside to the outside; the overlap length between the first section and the second section of the inner layer is 0-10 mm, and the middle layer is configured as one or a combination of metal braided structure and metal spiral structure.

[0019] The present invention provides a suction device, including a catheter portion and a telescopic portion, the telescopic portion being movably inserted into the catheter portion; the telescopic portion having at least a compressed state placed in the catheter portion and an expanded state after its distal end is detached from the catheter portion; in the expanded state, the portion of the telescopic portion other than its distal end is in contact with the catheter portion, and the distal end of the telescopic portion moves to the target tissue to suction the target tissue.

[0020] With this configuration, the telescopic section can move to the target tissue under the guidance of the catheter section for aspiration. Since the distal end of the telescopic section in its expanded state can extend beyond the catheter section and approach the inner wall of the predetermined conduit, different lengths and diameters of telescopic sections can be selected to reach target locations inaccessible to the catheter. This increases the area of ​​the aspiration port (i.e., the distal end of the telescopic section) without increasing the chamber size of the catheter section or the difficulty of delivery, thus facilitating the aspiration of large thrombi and improving aspiration efficiency. Simultaneously, the contact between the telescopic section and the inner wall of the predetermined conduit reduces the risk of thrombus escape, increasing the success rate of the procedure. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the use scenario of the suction device in a preferred embodiment of the present invention, wherein the suction device is provided with a quick-connect port;

[0022] Figure 2 This is a schematic diagram of the use scenario of the suction device in a preferred embodiment of the present invention, wherein the suction device is not provided with a quick-connect port;

[0023] Figure 3 This is a schematic diagram of the catheter portion in a preferred embodiment of the present invention;

[0024] Figure 4 This is a schematic diagram of the use scenario of the suction device in a preferred embodiment of the present invention, wherein the support is fully released;

[0025] Figure 5 This is a schematic diagram of the radial cross-section of the outer tube in a preferred embodiment of the present invention;

[0026] Figure 6 This is a schematic diagram of the structure of the inner tube and the connector in a preferred embodiment of the present invention;

[0027] Figure 7 This is a schematic diagram of the spring structure in a preferred embodiment of the present invention;

[0028] Figure 8 A schematic diagram of the structure of the telescopic part in a preferred embodiment of the present invention;

[0029] Figure 9 This is a partial structural diagram of the conduit portion and the telescopic portion in another preferred embodiment of the present invention;

[0030] Figure 10 This is a schematic diagram of a partial axial cross-sectional structure of the outer tube in a preferred embodiment of the present invention;

[0031] Figure 11 This is a schematic diagram of the radial cross-section of the outer tube at the location of the receiving groove in a preferred embodiment of the present invention;

[0032] Figure 12 This is a schematic diagram of the support structure in another preferred embodiment of the present invention.

[0033] In the figure: 100 pre-determined conduit; 200 target tissue; 1 conduit section; 11 inner tube; 111 opening; 112 first section; 113 second section; 114 spring structure; 13 connector; 12 outer tube; 121 first inner layer; 122 first intermediate layer; 123 first outer layer; 124 developing element; 125 receiving tank; 2 telescopic part; 2 support; 21 developing point; 212 developing wire; 22 operating element; 23 coating; 24 limiting element; 3 guide wire. Detailed Implementation

[0034] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. The advantages and features of the present invention will become clearer from the following description. It should be noted that the drawings are all in a very simplified form and use non-precise proportions, and are only used to facilitate and clarify the illustration of the embodiments of the present invention.

[0035] The terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used solely for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. The term "proximal end" generally refers to the end closer to the operator; "distal end" is the end opposite to "proximal end," generally referring to the end farther from the operator.

[0036] Reference Figure 1As shown, a preferred embodiment of the present invention provides a suction device, which is mainly used to intervene in a predetermined conduit 100 in the human body to suction target tissue 200 in the predetermined conduit 100, thereby removing the target tissue 200 from the body. It should be understood that the target tissue 200 generally refers to a thrombus in the predetermined conduit 100, and the predetermined conduit 100 refers to a blood vessel containing a thrombus in the patient or individual.

[0037] Reference Figures 1-3 As shown, the aspiration device includes a catheter section 1 and a telescopic section 2, the telescopic section 2 being movably inserted into the catheter section 1. The telescopic section 2 has at least a compressed state placed within the catheter section 1 and an expanded state after its distal end is detached from the catheter section 1, and can switch between the compressed and expanded states. In the compressed state, the telescopic section 2 is placed within the catheter section 1 for delivery; the distal end of the telescopic section 2 is used to expand after being detached from the catheter section 1; in the expanded state, the portion of the telescopic section 2 other than its distal end is in contact with the catheter section 1, and the distal end of the telescopic section 2 moves to the target tissue 200 to aspirate the target tissue 200.

[0038] It should be understood that the aforementioned target tissue 200 usually refers to the area near the target tissue 200 (e.g., thrombus). After the telescopic part 2 moves to the target tissue 200, the distance between the distal end of the telescopic part 2 and the thrombus in the direction of vascular extension is sufficient for the telescopic part 2 to suck in the thrombus.

[0039] In actual clinical operation, the catheter part 1 is first delivered into the predetermined tubing 100. After the catheter part 1 moves to a position close to the target tissue 200, the telescopic part 2 is pushed so that the distal end of the telescopic part 2 is freed from the restraint of the catheter part 1 and moves to the target tissue 200 for aspiration.

[0040] Furthermore, the proximal end of the catheter section 1 is connected to the drive section (not shown), which opens when the telescopic section 2 reaches the target tissue 200 to provide negative pressure, thereby drawing the thrombus through the telescopic section 2 into the catheter section 1. After thrombus aspiration is completed, the telescopic section 2 can be retracted back into the catheter section 1, and the catheter section 1 can be withdrawn from the body to complete the thrombectomy operation.

[0041] This application does not limit the type of suction device. The suction device includes, but is not limited to, a suction pump or a syringe. The suction device may also be other devices that can put the conduit section 1 under negative pressure.

[0042] In one embodiment, the telescopic part 2 can be pre-inserted into the catheter part 1 so that the catheter part 1 and the telescopic part 2 can be implanted into the body simultaneously. In another embodiment, the catheter part 1 and the telescopic part 2 can also be provided separately. In this case, the catheter part 1 can be implanted first, and then the telescopic part 2 can be placed in the catheter part 1 and moved toward the distal end of the catheter part 1 relative to the catheter part 1.

[0043] With this configuration, the telescopic part 2 can move to the target tissue 200 under the drive of the catheter part 1 to aspirate the target tissue 200. Since the distal end of the telescopic part 2 in the expanded state can extend out of the catheter part 1 and abut against the inner wall of the predetermined tube 100 and approach the thrombus location, telescopic parts 2 of different lengths and diameters can be selected to reach target locations that the catheter cannot reach. Without increasing the chamber size of the catheter part 1 and the difficulty of delivery, the area of ​​the aspiration port of the aspiration device (i.e., the distal end of the telescopic part 2) can be increased, which helps to aspirate large thrombi and improve aspiration efficiency. At the same time, the abutment of the telescopic part 2 against the inner wall of the predetermined tube 100 can also reduce the risk of thrombus escape and improve the success rate of the operation.

[0044] Continue to refer to Figure 1 As shown, in one specific embodiment, the catheter portion 1 includes an inner tube 11 and an outer tube 12. The inner tube 11 is movably inserted into the outer tube 12, and the telescopic portion 2 is movably inserted into the inner tube 11. The inner tube 11, the outer tube 12, and the telescopic portion 2 can be pre-installed and then implanted, or they can be set separately and installed during the operation.

[0045] The distal end of the telescopic portion 2 can move to the target tissue 200 after extending from the outer tube 12. The inner tube 11 is used to move proximally relative to the telescopic portion 2 until the distal end of the telescopic portion 2 expands and the portion of the telescopic portion 2 other than the distal end comes into contact with the outer tube 12, so as to facilitate the aspiration of the thrombus by the telescopic portion 2. This allows the telescopic portion 2 to smoothly pass through tortuous blood vessels under the action of the inner tube 11 to aspirate thrombi at more distant locations. At the same time, the aspiration force of the aspiration device can be increased through the large lumen of the catheter, thus improving the success rate of the aspiration device in aspirating large thrombi in extremely tortuous blood vessels and improving the aspiration performance of the aspiration device.

[0046] More specifically, since the inner diameter of the outer tube 12 is larger than that of the inner tube 11, when implanted into a tortuous and varied blood vessel, the inner tube 11 is more able to pass through the tortuous part of the blood vessel and reach the vicinity of the thrombus. The telescopic part 2 can be movably inserted into the inner tube 11 so that the telescopic part 2 can approach the thrombus under the action of the inner tube 11, so as to realize the suction of the thrombus in the tortuous blood vessel by the telescopic part 2.

[0047] Furthermore, after the inner tube 11 moves proximally, the telescopic part 2 comes into contact with the outer tube 12, thus connecting the telescopic part 12 and the outer tube 12. After the inner tube 11 is retracted, the outer tube 12 can be connected to the drive unit to aspirate the thrombus. Since the inner diameter of the outer tube 12 is larger than that of the inner tube 11, connecting the distal end of the outer tube 12 to the telescopic part 2 and the proximal end to the drive unit increases the inner diameter of the tubing during aspiration, thereby increasing the suction force of the telescopic part 2 on the thrombus. This helps the aspiration device aspirate large thrombi, improving the success rate of thrombus aspiration and increasing aspiration efficiency.

[0048] In other embodiments, the catheter portion 1 may consist only of the outer tube 12, with the telescopic portion 2 movably inserted within the outer tube 12 and capable of being delivered to the vicinity of the thrombus through the outer tube 12. The operator can then move the outer tube 12 proximally to expand the distal end of the telescopic portion 2 to aspirate the thrombus, thereby meeting the aspiration requirements for large thrombi.

[0049] Reference Figure 5 As shown, the outer tube 12 of the conduit section 1 is preferably a multi-layer tube body, specifically including a first inner layer 121, a first intermediate layer 122 and a first outer layer 123 nested from the inside out.

[0050] Generally, the first inner layer 121 is preferably a polymer tubing with a low coefficient of friction. The distal end of the first inner layer 121 is preferably made of a softer material, such as polytetrafluoroethylene (PTFE) or high-density polyethylene (HDPE). The proximal end of the first inner layer 121 is preferably made of a harder material. To ensure that different locations of the outer tube 12 have suitable hardness and flexibility, the overlap length between the distal and proximal ends of the first inner layer 121 of the outer tube 12 is preferably 0–10 mm.

[0051] Furthermore, the first intermediate layer 122 of the outer tube 12 is preferably one or a combination of two of the following: a metal wire braided structure or a metal spiral structure. The material of the first intermediate layer 122 can be stainless steel, nickel-titanium, platinum-tungsten or other suitable metal materials.

[0052] Furthermore, the first outer layer 123 is preferably composed of multiple segments of tubing with different hardnesses connected together, wherein the hardness of the proximal end of the first outer layer 123 is greater than the hardness of the distal end of the first outer layer 123, and the first outer layer 123 may be made of TPU, Pebax, nylon or other suitable materials.

[0053] Return to reference Figure 1 and Figure 3 The outer tube 12 is also provided with a developing element 124 (e.g., a developing ring sleeved on the outer tube 12) at its distal end. The developing element 124 is made of materials including but not limited to platinum-iridium, platinum-tungsten, gold, or other non-transmissive materials.

[0054] Return to reference Figure 1 In a preferred embodiment, the inner tube 11 is provided with an opening 111 for the guide wire 3 to pass through. The guide wire 3 is inserted into the inner tube 11 through the opening 111 and extends out of the distal end of the inner tube 11. The inner tube 11 is used to move on the guide wire 3 until it is implanted in place. During actual implantation, the guide wire 3 can be inserted into the inner tube 11 through the opening 111 and implanted into the human body. This shortens the movement path of the guide wire 3 in the inner tube 11, thereby facilitating the rapid implantation of the guide wire 3, helping the inner tube 11 to be quickly and smoothly placed in place, and saving the delivery time of the inner tube 11.

[0055] Reference Figure 6 and Figure 7 As shown, in this embodiment, the inner tube 11 includes a first section 112 and a second section 113 connected sequentially along its own axial direction from the proximal end to the distal end. The hardness of the first section 112 is greater than that of the second section 113. The distal end of the first section 112 is a spring structure 114, and the length of the spring structure 114 in the extension direction of the inner tube 11 is 5mm to 50mm. In this case, the spring structure 114 can be used to transition between the distal part (i.e., the second section 113) and the proximal part (i.e., the first section 112) of the inner tube 11, so that the hardness of the inner tube 11 transitions smoothly from the proximal part to the distal part, preventing the inner tube 11 from bending or being damaged at locations with large changes in hardness.

[0056] In one embodiment, the first segment 112 is composed of multiple layers of polymer tubes, the second segment 113 is composed of metal tubes, and the spring structure 114 can be formed by cutting the distal end of the metal tubes, in which case the spring structure 114 is integrally formed with the first segment 112. In another embodiment, the spring structure 114 can also be formed separately from the first segment 112 and then connected.

[0057] In a preferred embodiment, the inner tube 11 includes a second inner layer, a second intermediate layer, and a second outer layer (not shown) nested sequentially from the inside to the outside. The second inner layer of the inner tube 11 is preferably made of a soft and smooth material, such as polytetrafluoroethylene (PTFE), high-density polyethylene (HDPE), or polyolefin. The second intermediate layer of the inner tube 11 is a reinforcing layer, preferably a combination of one or both of a metal braided structure and a metal spiral structure, and is preferably made of a nickel-titanium alloy. The hardness of the second section 113 of the second outer layer of the inner tube 11 is less than the hardness of the first section 112 of the second outer layer, and the material of the second section 113 is preferably Pebax. The material of the first section 112 is preferably stainless steel, which provides better torque transmission and pushing force for the inner tube 11.

[0058] Continue to refer to Figure 6 As shown, the suction device also includes a connector 13, which is connected to the proximal end of the inner tube 11 and is used to control the movement of the inner tube 11 along its own axial direction. The operator can control the movement of the inner tube 11 relative to the outer tube 12 and the telescopic member 2 by pushing or pulling the connector 13.

[0059] Reference Figure 8 and combined Figure 1 and Figure 3 As shown, the telescopic part 2 includes a mesh-like support 21. The support 21 can be prepared by cutting or weaving. The materials used to prepare the support 21 include, but are not limited to, nylon, Pebax, stainless steel, nickel-titanium alloy, cobalt-chromium alloy, or platinum-tungsten alloy.

[0060] The stent 21 is preferably a self-expanding stent, meaning that the stent 21 can be compressed by the inner tube 11 and automatically expands after the restraints of the inner tube 11 and outer tube 12 are removed, until it contacts the vessel wall to anchor in the vessel. After the stent 21 is released from the restraints of the inner tube 11, the distal end of the stent 21 abuts against the inner wall of the predetermined conduit 100, and the proximal end of the stent 21 is restrained in the outer tube 12. Specifically, when the stent 21 moves relative to the outer tube 12, the distal end of the stent 21 needs to be moved out of the outer tube 12, and the proximal end of the stent 21 needs to be placed inside the outer tube 12. In this way, after the stent 21 moves to the target tissue 200 and the inner tube 11 is withdrawn, the connection between the proximal end of the stent 21 and the outer tube 12 is achieved.

[0061] It should be noted that stent 21 comes in various specifications with different lengths and outer diameters. During actual implantation, a suitable stent 21 specification can be selected according to the diameter of the predetermined conduit 100 and the distance of the outer tube 12 from the thrombus, so as to ensure that the distal end of stent 21 can be moved to the target tissue 200 and the proximal end of stent 21 can be connected to the outer tube 12.

[0062] Preferably, the telescopic part 2 further includes an operating member 22, which is movably inserted into the inner tube 11. The distal end of the operating member 22 is connected to the proximal end of the support 21, and the proximal end of the operating member 22 extends out of the proximal end of the inner tube 11. The operating member 22 is used to drive the support 21 to move within the inner tube 11.

[0063] During actual implantation, the operator can move the stent 21 to the target tissue 200 by pushing the control element 22. After the stent 21 is aspirated, the operator can also pull the control element 22 to allow the stent 21 to enter and be compressed back into the inner tube 11 or outer tube 12.

[0064] This application does not limit the type of the actuating element 22. In this embodiment, the actuating element 22 is a wire, and there is at least one wire. The wire can be pushed or pulled to drive the support 21 to move. In another embodiment, the actuating element 22 can also be a tube or a rod, etc.

[0065] This application does not limit the connection method between the control element 22 and the bracket 21. The control element 22 and the bracket 21 can be connected by laser welding or adhesive bonding. The bracket 21 and the control element 22 can also be cut from the same tube.

[0066] Continue to refer to Figure 3 and Figure 8 The surface of the stent 21 is provided with a membrane 23, which covers at least the portion of the stent 21 that extends out of the outer tube 12 in the expanded state. With this structure, the membrane 23 can prevent thrombi from escaping from the mesh of the stent 21, ensuring that the thrombi are aspirated into the outer tube 12 and improving the success rate of thrombus aspiration.

[0067] Specifically, the covering 23 may only cover the portion of the stent 21 extending out of the outer tube 12 in the expanded state (i.e., when the stent 1 has moved to the target tissue 200), or the covering 23 may cover the portion of the stent 21 located inside the outer tube 12 in the expanded state. In addition, the covering 23 may cover part of the inner or outer surface of the stent 21, or the covering 23 may cover the entire inner or outer surface of the stent 21.

[0068] Preferably, in the expanded state, the proximal end of the covering 23 is close to the end of the outer tube 12. At this time, the covering 23 just covers the part of the stent 21 that extends out of the outer tube 12. At this time, a sealed channel can be formed at the stent 21 and the outer tube 12 to facilitate rapid and high-load aspiration of thrombi.

[0069] In a preferred example, the membrane 23 covers the outer surface of the stent 21, and the proximal end of the membrane 23 is close to the end of the outer tube 12. After the stent 21 expands, the outer surface of the stent 21 and the distal end of the outer tube 12 can be smoothly transitioned to avoid the formation of a recessed area on the outside of the aspiration device, thereby reducing the risk of blood accumulating in the recessed area of ​​the aspiration device and forming a thrombus.

[0070] This application does not limit the material used to prepare the coating 23. The coating 23 can be prepared using materials such as ePTFE, polyolefin, TPE or TPU.

[0071] Reference Figure 3 and Figure 8 As shown, in a preferred example, both the proximal and distal ends of the stent 21 are provided with imaging points 211 to facilitate the operator's observation of the implantation location of the stent 21.

[0072] Reference Figure 9 As shown, in one illustrative embodiment, the stent 21 is woven from a plurality of braided filaments, at least a portion of which are radiopaque filaments 212, so that the position of the stent 21 can be easily observed after the stent 21 is expanded, which facilitates control of the surgical process.

[0073] Optionally, the stent 21 may be woven from cobalt-chromium wire or nickel-titanium wire in conjunction with the radiopaque wire 212. The distal end of the stent 21 is preferably funnel-shaped to enhance the anchoring ability of the stent 21 and facilitate the retrieval of the stent 21 for thrombus removal and recovery.

[0074] Reference Figures 10-12 As shown, in a preferred embodiment, a receiving groove 125 is provided on the inner wall of the outer tube 12, and a limiting member 24 is provided on the telescopic part 2. The limiting member 24 can be placed in the receiving groove 125 to limit the movement distance of the telescopic part 2 relative to the outer tube 12 and prevent the proximal end of the telescopic part 2 from moving out of the outer tube 12. When the telescopic part 2 moves towards the proximal end relative to the outer tube 12, the limiting member 24 can disengage from the receiving groove 125 so that the telescopic part 2 moves into the outer tube 12.

[0075] This application does not limit the shape of the receiving groove 125 and the limiting member 24. In this embodiment, the receiving groove 125 is an annular groove provided on the inner wall of the outer tube 12, and the limiting member 24 is connected to the bracket 21 and is configured as a tapered structure with the outer peripheral area gradually decreasing towards the distal end. When the bracket 21 moves towards the distal end relative to the outer tube 12, the tapered limiting member 24 can be placed in the annular groove to limit the bracket 21 from continuing to move towards the distal end.

[0076] In a non-limiting embodiment, the suction device is used as follows:

[0077] 1) The outer tube 12 is inserted into the predetermined tube 100 under the guidance of the outer tube guide wire;

[0078] 2) Insert the guidewire 3 into the opening 111 of the inner tube 11. The inner tube 11 moves to the thrombus location under the action of the guidewire 3. Remove the guidewire 3 and move the outer tube 12 to a position closer to the thrombus.

[0079] 3) Push the operating member 22 until the distal end of the support 21 moves to the distal end of the inner tube 11, and the proximal end of the support 21 is located inside the inner tube 11 and the outer tube 12.

[0080] 4) Push the stent 21 and withdraw the inner tube 11 to expand the distal end of the stent 21 and anchor it to the inner wall of the thrombus; continue to withdraw the inner tube 11, and the proximal end of the stent 21 disengages from the inner tube 11 and is bound in the outer tube 12.

[0081] 5) Adjust the position of the outer tube 12 so that the proximal end of the membrane 23 on the support 21 is in contact with the end of the outer tube 12;

[0082] 6) Remove the inner tube 11 and connect the proximal end of the outer tube 12 to a syringe or suction pump to draw negative pressure into the inner tube 11.

[0083] 7) After the thrombus is aspirated from the distal end of the stent 21 into the outer tube 12, pull the operating element 22 to retract the stent 21 into the outer tube 12.

[0084] 8) Remove the outer tube 12 and stent 21 together to complete the thrombus removal process.

[0085] In summary, the present invention provides a suction device in which the telescopic part 2 can move to the target tissue 200 under the drive of the catheter part 1 to suction the target tissue 200. Since the distal end of the telescopic part 2 in the expanded state can extend out of the catheter part 1 and abut against the inner wall of the predetermined tube 100 and approach the thrombus location, telescopic parts 2 of different lengths and diameters can be selected to reach target locations that the catheter cannot reach. Without increasing the chamber size of the catheter part 1 and the difficulty of delivery, the area of ​​the suction port of the suction device can be increased, which helps to suction large thrombi and improves suction efficiency. At the same time, the abutment of the telescopic part 2 against the inner wall of the predetermined tube 100 can also reduce the risk of thrombus escape and improve the success rate of the operation.

[0086] The above description is merely a description of preferred embodiments of the present invention and is not intended to limit the scope of the present invention in any way. Any changes or modifications made by those skilled in the art based on the above disclosure shall fall within the protection scope of the present invention.

Claims

1. A suction device, characterized in that The catheter includes a catheter part and a telescopic part, the telescopic part is movably arranged in the catheter part, and the telescopic part has at least a compressed state in the catheter part and an expanded state after the distal end of the telescopic part is separated from the catheter part; In the expanded state, the telescopic part is in contact with the catheter part except the distal end, and the distal end of the telescopic part is moved to the target tissue to aspirate the target tissue.

2. The suction arrangement of claim 1, wherein The catheter part includes an inner tube and an outer tube, the inner tube is movably arranged in the outer tube, and the telescopic part is movably arranged in the inner tube; The distal end of the telescopic part can be moved to the target tissue after extending out of the outer tube, and the inner tube is used to move proximally relative to the telescopic part until the distal end of the telescopic part is expanded and the telescopic part is in contact with the outer tube except the distal end.

3. The suction arrangement of claim 2, wherein The telescopic part includes a mesh tube-shaped stent, the stent can be compressed by the inner tube and can be automatically expanded after the constraint of the inner tube and the outer tube is removed, the distal end of the stent is in contact with the inner wall of the predetermined pipeline after the stent is separated from the constraint of the inner tube, and the proximal end of the stent is constrained in the outer tube.

4. The suction arrangement of claim 3, wherein The telescopic part further includes a control member movably arranged in the inner tube, the distal end of the control member is connected with the proximal end of the stent, and the proximal end of the control member extends out of the proximal end of the inner tube; the control member is used to drive the stent to move in the inner tube.

5. The suction arrangement of claim 4, wherein The control member is a wire, the number of the wire is at least one, and the wire can be pushed or pulled to drive the stent to move.

6. The suction device of claim 3, wherein, The surface of the stent is provided with a coating, and the coating at least covers the part of the stent extending out of the outer tube in the expanded state.

7. The suction arrangement of claim 6, wherein In the expanded state, the proximal end of the coating is in contact with the end of the outer tube.

8. The suction device of claim 3, wherein, The stent is woven by a plurality of woven wires, and at least part of the plurality of woven wires are developed wires.

9. The suction arrangement of any one of claims 2-8, wherein, The inner tube is provided with an opening for a guide wire to pass through, the guide wire is used to pass into the inner tube from the opening and extend out of the distal end of the inner tube, and the inner tube is used to move on the guide wire.

10. The suction arrangement of any one of claims 2-8, wherein, The inner wall of the outer tube is provided with a receiving groove, and the telescopic part is provided with a limiting member; the limiting member can be placed in the receiving groove to limit the movement distance of the telescopic part relative to the outer tube.

11. The suction arrangement of any one of claims 2-8, wherein, The inner tube includes a first segment and a second segment connected in sequence along the axis of the inner tube from the proximal end to the distal end, the hardness of the first segment is greater than the hardness of the second segment, and the distal end of the second segment is a spring structure with a length of 5mm-50mm in the extension direction of the inner tube.

12. The suction arrangement of claim 11, wherein The inner tube includes an inner layer, an intermediate layer and an outer layer nested in sequence from the inside to the outside; the overlap length between the first segment of the inner layer and the second segment of the inner layer is 0-10mm, and the intermediate layer is provided as one or a combination of the other of a metal woven structure and a metal spiral structure.

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