Thrombus catcher

Abstract

The thrombus catcher comprises a thrombus catching section, a wall attaching section and a closing section, the thrombus catching section is of a conical hollow structure with the near end open and the far end diameter gradually reduced, the wall attaching section is woven along the near end of the thrombus catching section and is of a mesh enclosure structure, and the closing section is woven along the near end of the wall attaching section and is arranged in a stranded mode. The thrombus capturing section, the wall attaching section and the closing-in section are integrally formed and woven and are coaxially arranged, the thrombus capturing device is integrally woven, the overall flexibility is good, the thrombus capturing device is not prone to being bent and folded in a blood vessel, thrombus capturing is prevented from being affected, the wall attaching section of the thrombus capturing device can be tightly attached to the blood vessel wall after being released, thrombus is prevented from escaping, and the thrombus capturing effect is good. The woven fan blades wrap the thrombus to prevent thrombus leakage during recovery, the coaxial design enables the thrombus to be not prone to displacement, and the thrombus capturing capacity in the operation is greatly enhanced.

Description

Technical Field

[0001] The present application relates to the technical field of medical devices, and in particular to a thrombus capture device. Background Art

[0002] Arterial stenosis refers to the thickening of the blood vessel wall and the narrowing of the blood vessel lumen caused by atherosclerosis, trauma or other congenital factors, which leads to ischemia of the organs or tissues controlled by the blood vessels. Balloon dilatation, balloon-expandable stent placement and stent placement are all common procedures for treating vascular stenosis. During the operation, the expansion of the blood vessels will cause blood clots to fall off. If the blood clots are not prevented from flowing to the distal end with the blood flow, it will cause serious consequences such as cerebral infarction and myocardial infarction. Embolic protection devices are usually placed prophylactically at the distal end of the lesion before balloon dilatation or stent placement to capture blood clots that fall off during the operation. However, after the current devices capture the blood clots, the blood clots can easily escape from between the device and the inner wall of the blood vessel, causing serious subsequent effects. Summary of the invention

[0003] In view of this, the present application proposes a thrombus capture device to prevent the captured thrombus from escaping from between the inner wall of the blood vessel and the device.

[0004] According to one aspect of the present application, a thrombus capture device is provided, comprising: a thrombus capture section, a wall-adhering section, and a closing section;

[0005] The bolt-catching section is a hollow structure with an opening at the proximal end and a gradually decreasing diameter at the distal end to form a cone;

[0006] The wall-adhering section is woven along the proximal end of the bolt-catching section to form a mesh structure.

[0007] The closing section is woven along the proximal end of the wall-adhering section and arranged in strands;

[0008] The bolt catching section, the wall-adhering section and the closing section are integrally formed and woven.

[0009] In a possible implementation, the wall-adhering segment includes a woven fan sheet and a straight segment;

[0010] The proximal end of the bolt-catching section is woven with the straight section of the wall-adhering section, and the straight section is a columnar hollow structure, and the diameters of the openings at both ends are the same;

[0011] The straight section is open at one end away from the bolt-catching section and is woven with the woven fan sheet;

[0012] Wherein, the woven fan sheet is in a mesh-like structure.

[0013] In a possible implementation, the bolt catching section is cross-woven with braided wires;

[0014] The plurality of braided wires are braided along the braiding direction of the bolt-catching section to form the braided fan pieces in a mesh-like structure;

[0015] Or after the plurality of braided wires are used to braid the bolt catching section, the braided fan sheets are braided in sequence.

[0016] In a possible implementation, the number of the braided wires is n, and n is a multiple of 2 and 3;

[0017] The number of the braided sectors is s, the number s is greater than 2, and the number of braided wires in each of the braided sectors is n / s.

[0018] In a possible implementation, the proximal ends of the woven fan sheets converge into strands having the closing section, and the woven fan sheets are hollow structures.

[0019] In a possible implementation, the braided fan sheet includes braided wires that are cross-woven or sequentially woven.

[0020] In a possible implementation, the braided wires of the braided fan sheet are arc-shaped, cross-woven or sequentially braided, and symmetrically arranged on two opposite sides.

[0021] In a possible implementation, the cross-sectional diameter of the plurality of woven sectors is equal to the cross-sectional diameter of the straight section.

[0022] In a possible implementation, the closing section is woven from the braided wires of the wall-adhering section and extends a preset length relative to the wall-adhering section;

[0023] A plurality of closing sections are bounded at one end away from the wall-adhering section.

[0024] In a possible implementation, the closing section has a preset length, and the proximal ends of two or more closing sections are fixed.

[0025] In a possible implementation, the straight section is woven with a preset length.

[0026] In one possible implementation, the braided wire is a material with shape memory properties such as nickel titanium, cobalt chromium, or a DFT braided wire containing an opaque component, or a mixture of shape memory braided wires such as nickel titanium, cobalt chromium, etc. and radiopaque braided wires such as platinum tungsten, platinum iridium, etc.

[0027] In a possible implementation, the bolt catching section is a braided wire braided in an axial direction and presents a conical structure with one end open.

[0028] In a possible implementation, the outer diameter of the straight section is in the range of 2 mm-10 mm.

[0029] In a possible implementation, the length of the thrombus capture device is in the range of 10 mm to 70 mm.

[0030] In a possible implementation, the diameter of the braided wire strands is between 20 micrometers and 100 micrometers.

[0031] In a possible implementation, the size of the woven mesh of the bolt-catching segment is between 20 μm and μm.

[0032] In a possible implementation, the method further includes: an expansion ring;

[0033] The expansion ring has a wavy structure, and the protrusion position of the expansion ring corresponds to the mesh structure of the woven fan sheet, and is woven in the straight section and the woven fan sheet.

[0034] In a possible implementation, the braided wires of the closing section are bound into strands by a developing spring;

[0035] Or the braided wires of the closing section are twisted into strands facing the same direction;

[0036] Or the braided wires of the closing section are interwoven into strands.

[0037] In a possible implementation, the bolt-catching section, the wall-adhering section, and the closing section are coaxially arranged.

[0038] The beneficial effects of the thrombus capture device of the embodiment of the present application are as follows: the diameter of the distal end of the thrombus capture section gradually decreases and becomes a cone, which can more conveniently enter the thrombus site and improve the efficiency of capturing the thrombus; the thrombus capture section is a woven structure with good flexibility and axial compression resistance, and is not easy to collapse during the pushing or recovery process, thereby improving the thrombus capture effect; the wall-adhering section is arranged at the proximal end of the thrombus capture section, and can provide better radial support force after the thrombus is captured, so that the thrombus capture section is close to the inner wall of the blood vessel to prevent the thrombus from escaping; the closing section is used to fix to the cutting tube of the thrombus removal device to realize the recovery of the thrombus capture device; the structure is simple and reliable; the wall-adhering section can be opened when the wall-adhering section is stretched, thereby further improving the fit between the thrombus capture section and the inner wall of the blood vessel and reducing the risk of thrombus escape.

[0039] Other features and aspects of the present application will become apparent from the following detailed description of exemplary embodiments with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate exemplary embodiments, features, and aspects of the present application and, together with the description, serve to explain the principles of the present application.

[0041] Figure 1 A schematic diagram showing the main structure of the thrombus capture device according to an embodiment of the present application;

[0042] Figure 2 Another schematic diagram showing the main structure of the thrombus capture device according to an embodiment of the present application;

[0043] Figure 3 A schematic diagram showing the sequentially woven main body structure of the wall-attached segment according to an embodiment of the present application;

[0044] Figure 4 A schematic diagram showing the cross-woven main structure of the wall-adhering segment of an embodiment of the present application;

[0045] Figure 5 A schematic diagram showing the main structure of the embodiment of the present application in which the wall-adhering section is interspersed with thicker braided wires;

[0046] Figure 6 A schematic diagram showing the main structure of the wall-adhering section of an embodiment of the present application provided with a fixing ring;

[0047] Figure 7 A schematic diagram showing the top main structure of the thrombus capture device according to an embodiment of the present application;

[0048] Figure 8 A schematic diagram showing the main structure of the closing section of an embodiment of the present application;

[0049] Fig. 9 Another schematic diagram of the main structure of the closing section of the embodiment of the present application is shown;

[0050] Fig.10 Another schematic diagram of the main structure of the closing section of the embodiment of the present application is shown;

[0051] Fig.11 A schematic diagram showing the main structure of the thrombus capture device of an embodiment of the present application for capturing thrombus;

[0052] Fig.12 A schematic diagram of the main structure of the thrombus capture device of an embodiment of the present application is shown. DETAILED DESCRIPTION

[0053] Various exemplary embodiments, features and aspects of the present application will be described in detail below with reference to the accompanying drawings. The same reference numerals in the accompanying drawings represent elements with the same or similar functions. Although various aspects of the embodiments are shown in the accompanying drawings, the drawings are not necessarily drawn to scale unless otherwise specified.

[0054] Among them, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention or simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0055] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0056] The word “exemplary” is used exclusively herein to mean “serving as an example, example, or illustration.” Any embodiment described herein as “exemplary” is not necessarily to be construed as preferred or advantageous over other embodiments.

[0057] In addition, in order to better illustrate the present application, numerous specific details are given in the following specific embodiments. It should be understood by those skilled in the art that the present application can also be implemented without certain specific details. In some examples, methods, means, components and circuits well known to those skilled in the art are not described in detail in order to highlight the subject matter of the present application.

[0058] like Figure 1 As shown, the thrombus capture device of the embodiment of the present application includes: a thrombus capturing segment 100, a wall-adhering segment and a closing segment 120. The thrombus capturing segment 100 is a hollow structure with a proximal opening and a distal diameter that gradually decreases to form a cone. The wall-adhering segment is woven along the proximal end of the thrombus capturing segment 100 to form a mesh structure. The closing segment 120 is woven along the proximal end of the wall-adhering segment and is arranged in strands. The thrombus capturing segment 100, the wall-adhering segment and the closing segment 120 are integrally formed and woven.

[0059] In this embodiment, the thrombus capture device is woven in one piece, has good overall flexibility, and is not easy to bend or fold in the blood vessel to avoid affecting the capture of thrombi. The wall-adhering section of the thrombus capture device can adhere closely to the blood vessel wall after release to prevent the escape of thrombi. The woven fan sheets 110 of the wall-adhering section wrap around the thrombus during recovery to prevent leakage of thrombi, and the coaxial design makes it not easy to shift, thereby greatly enhancing the ability to capture thrombi during surgery.

[0060] Specifically, in this specific embodiment, the diameter of the distal end of the thrombus catching segment 100 gradually decreases to form a cone, which can more conveniently enter the thrombus site and improve the efficiency of capturing the thrombus. The thrombus catching segment 100 is a braided structure with good flexibility and axial compression resistance. It is not easy to collapse during the pushing or recovery process, which improves the thrombus capturing effect. The wall-adhering segment is woven at the proximal end of the thrombus catching segment 100, which can provide better radial support after the thrombus is captured, so that the thrombus catching segment 100 is close to the inner wall of the blood vessel to prevent the thrombus from escaping. The braided fan sheet 110 of the wall-adhering segment can be opened when the wall-adhering segment is stretched, which further improves the fit between the thrombus catching segment 100 and the inner wall of the blood vessel and reduces the risk of thrombus escape.

[0061] In this specific embodiment, the ends of the closing section 120 and the thrombus catching section 100 are connected with a closed ring 140, which is used to connect with the delivery guide wire to complete the delivery of the thrombus capture device in the blood vessel. The closing section 120 first enters the catheter after the device captures the thrombus to play a closing role. After the device is completely released, the wall-adhering section is in direct contact with the blood vessel wall to prevent the thrombus from escaping. During recovery, the woven fan sheet 110 can wrap the thrombus and effectively prevent leakage. The thrombus catching section 100 is a conical net bag for loading thrombus. Among them, the closed ring 140 binds the thrombus catching section 100 and the closing section 120 by glue bonding or welding and leaves a cavity for the delivery guide wire with the delivery member to pass through, so as to achieve the effect of delivery and recovery in the blood vessel, and the closed ring 140 is an X-ray opaque development material, which is used to assist the operator in positioning the device during the operation, and contains precious metal materials such as platinum iridium, platinum tungsten, and tantalum.

[0062] In a specific embodiment, the wall-adhering section includes a woven fan piece 110 and a straight section 130. The proximal end of the bolt-catching section 100 is woven with the straight section 130 of the wall-adhering section. The straight section 130 is a columnar hollow structure with the same diameter at both ends of the opening. The straight section 130 is woven with a woven fan piece 110 at one end away from the bolt-catching section 100, wherein the woven fan piece 110 is a mesh-like structure.

[0063] In this specific embodiment, the proximal end of the thrombus catching section 100 is further woven with a straight section 130 of the wall-adhering section, and the straight section 130 is a hollow ring structure, and the straight section 130 is woven with a preset length. When the thrombus catching section 100 is stretched, the straight section 130 can be opened accordingly, closely attached to the inner wall of the blood vessel, effectively preventing the escape of the thrombus, improving the wall-adhering performance of the thrombus catcher, and further enhancing the ability to capture thrombus.

[0064] Furthermore, in this specific embodiment, the straight section 130 is a hollow annular structure with the same diameter along the axial length direction, and can be attached to the inner wall of the blood vessel. When the thrombus capture device is delivered to the thrombus position through the delivery guide wire, the thrombus capture section 100 of the conical structure passes through the thrombus and opens the thrombus entrapment section, so that the straight section 130 can be attached to the inner wall of the blood vessel to prevent the thrombus from escaping.

[0065] The bolt catching section 100 and the straight section 130 are integrally formed and woven.

[0066] Furthermore, during the weaving process, the straight section 130 will make the proximal end of the braided structure straight, that is, the proximal end can be in close contact with the inner side of the blood vessel wall, thereby preventing emboli from escaping from between the braided structure and the blood vessel wall.

[0067] In this specific embodiment, the braided fan sheet 110 has a mesh-like structure, which is used to capture thrombi and prevent them from escaping. Specifically, the inside of the braided fan sheet 110 can be woven with thicker braided wires 200 or woven into a stabilizing member with a wavy structure, so as to increase the hardness of the braided fan sheet 110, make it less likely to deform, and prevent it from deforming or displacing during the process of capturing thrombi. The braided fan sheet 110 has sufficient flexibility and radial support force, and can adapt to different forms of the inner wall of the blood vessel, while avoiding unnecessary damage to the blood vessel. Among them, the braided fan sheet 110 with a mesh-like structure can fit closely to the inner wall of the blood vessel when expanding, and also ensure its stability and reliability during the transportation process, so that the braided fan sheet 110 can undergo moderate elastic deformation when subjected to external force, so as to fit the inner wall of the blood vessel more evenly, avoiding the risk of local over-expansion or compression.

[0068] Among them, the braided fan sheet 110 continues to be woven following the straight section 130 of the wall-adhering section, which is a straight and stable design. The braided fan sheet 110 can fit closely to the blood vessel wall to form a barrier that adheres to the blood vessel wall to prevent small-volume thrombi from passing through, and solves the problem that emboli may escape from between the braided wire 200 and the blood vessel wall, ensuring the safety and effectiveness of the thrombus removal process. Through the stable support of the braided fan sheet 110, the braided wire 200 can maintain a stable posture in the complex intravascular environment, providing a solid foundation for subsequent thrombus capture operations.

[0069] Furthermore, if Figure 6 As shown, the expansion ring has a "W"-shaped structure. When woven into the wall-attached segment, the expansion range and hardness of the wall-attached segment can be improved during expansion, so that the wall-attached segment can fit the inner wall of the blood vessel more evenly and stably during expansion, further reducing surgical risks.

[0070] In a specific embodiment, the thrombus-catching segment 100 is a cross-woven braided wire 200. A plurality of braided wires 200 are woven along the braiding direction of the thrombus-catching segment 100 to form a wall-attached segment with a mesh-like structure. The braiding method of the wall-attached segment is the same as that of the thrombus-catching segment 100, and the braided wires 200 are cross-woven with each other. Specifically, when the braided wires 200 are weaving the wall-attached segment, a more dense cross-weaving method will be adopted to form closely connected grids. These grids not only have sufficient strength and stability to fit tightly on the blood vessel wall to prevent thrombus escape, but also have a certain elasticity to adapt to the slight deformation of the blood vessel wall, ensuring the stability and durability of the capture device in the blood vessel. At the same time, when the braided wires 200 are weaving the wall-attached segment, the size and shape of the grid will be adjusted according to the curvature and diameter of the blood vessel wall. This design enables the wall-attached segment to better adapt to blood vessels in different parts, improving the versatility and applicability of the capture device.

[0071] Among them, in another specific embodiment, the bolt catching segment 100 is a braided wire 200 cross-woven, and after a plurality of braided wires 200 are woven into the bolt catching segment 100, a wall-attached segment is woven in sequence, that is, the braided wires 200 used to weave the wall-attached segment will not cross each other. Specifically, after the braiding of the bolt catching segment 100 is completed, the wall-attached segment is woven in sequence. This method is generally suitable for situations where a longer wall-attached segment or a more complex wall-attached structure is required. After the bolt catching segment 100 is woven, the braided wire 200 will continue to move forward along the end of the bolt catching segment 100 and start weaving the wall-attached segment. In the process of weaving the wall-attached segment in sequence, the braided wire 200 will maintain a certain tension and angle to ensure that the wall-attached segment can fit tightly on the blood vessel wall. At the same time, the braided wire 200 will also adjust the density and shape of the weaving according to the needs of the wall-attached segment to form the desired mesh-like structure.

[0072] Among them, the thrombus capture section 100 of the thrombus capture device is shaped like a conical net bag, and there are two ways to form it. One is to directly use a closed ring 140 to bind the end to form a natural conical section. The other is to use a heat treatment method to put a regularly woven round tube on a conical mold and then perform heat treatment to shape it. After the mold-controlled conical section is formed, the closed ring 140 is put on.

[0073] In a specific embodiment, if Figure 1 , Figure 2 , Figure 3 and Figure 4As shown, there are more than two braided fan blades 110, which can be 2, 3 or 4, depending on the size of the thrombus inside the blood vessel and the wall adhesion. Specifically, the number of braided fan blades 110 is determined according to the total number of braided wires 200. The number of braided wires 200 used to braid the thrombus-catching section 100 is n, where n is a multiple of 2 and 3. The number of braided fan blades 110 is s, where s is greater than 2, and the number of braided wires 200 in each braided fan blade 110 is n / s. Therefore, the number of braided fan blades 110 is related to the total number of braided wires 200.

[0074] In a specific embodiment, the wall-adhering section extends toward a direction away from the thrombus-catching section 100 with a closing section 120, and the closing section 120 is a long braided structure formed by the wall-adhering section arranged in strands. Specifically, the closing section 120 has a preset length, and the proximal ends of two or more closing sections 120 are fixed, which is convenient for connecting with the delivery device, and the wall-adhering section, the closing section 120 and the thrombus-catching section 100 are opened to capture the thrombus.

[0075] In a specific embodiment, the braided wire 200 is a material with shape memory properties such as nickel titanium, cobalt chromium, or a DFT braided wire 200 containing an opaque component, or a shape memory braided wire 200 such as nickel titanium, cobalt chromium, etc. is mixed with a radiopaque braided wire 200 such as platinum tungsten, platinum iridium, etc.

[0076] The braided wire 200 is a metal braided wire 200 material with shape memory capability, that is, after being deformed by an external force, it can be restored to its original shape by heating or other stimulation methods. Therefore, when the braided wire 200 is subjected to external force or environmental changes, it can automatically adjust its shape, thereby maintaining the stability and functionality of the braided wire 200. In addition, the "change-recovery" process of the shape memory alloy can be repeated many times without being affected, which ensures the stability and reliability of the braided wire 200 during long-term use.

[0077] In a specific embodiment, the embolus catching segment 100 is a braided wire 200 braided in the axial direction, presenting a conical structure with one end open. As the distal part of the braided wire 200, the embolus catching segment 100 adopts a high braiding density design. This design not only enhances the strength and toughness of the embolus catching segment 100, but also gives it excellent capture ability. In the process of suction and embolus removal, the embolus catching segment 100 can effectively intercept and capture those tiny emboli that may escape like a precise capture net. If these tiny emboli are not captured in time, they may enter the distal blood vessels with the blood flow, leading to serious consequences such as vascular occlusion, and the high-density braided wire 200 of the embolus catching segment 100 can minimize this risk and ensure the thoroughness and safety of the embolus removal process.

[0078] In a specific embodiment, the stranded wall-attaching section is woven with braided fan sheets 110, which are hollow structures, and the number of braided fan sheets 110 is equal to the number of braided wires 200 of the braided thrombus-catching section 100. The wall-attaching section is a mesh structure as a whole, with braided fan sheets 110 hollowed out, and the braiding aperture is larger than the braiding aperture of the thrombus-catching section 100, so that the braided fan sheets 110 can partially cover the thrombus, and are easy to deform to lift and cover the thrombus.

[0079] Furthermore, the braided fan sheet 110 includes braided wires 200 that are cross-woven or sequentially woven.

[0080] In a specific embodiment, the outer diameter of the wall-adherent section is in the range of 2 mm-10 mm.

[0081] The length of the thrombus capture device is in the range of 10 mm to 70 mm.

[0082] The diameter of the wire strands of the braided wire 200 is between 20 micrometers and micrometers.

[0083] The size of the woven mesh of the bolt-catching section 100 is between 20 μm and μm.

[0084] In a specific embodiment, if Figure 5 As shown, a thicker braided wire 200 is woven in the braided wire 200 of the thrombus capture device, which can increase the wall-adhering effect of the straight section 130 and prevent leakage of the thrombus. The edge braided wire 200 of the braided fan sheet 110 can be a braided wire 200 with a thicker diameter, and the edge braided wire 200 of the braided fan sheet 110 can also be a developing wire, which can not only provide an overall developing effect, but also help the operator to judge the opening of the wall-adhering section.

[0085] In a specific embodiment, if Figure 7 , Figure 8 , Fig. 9 and Fig.10As shown, the end binding method of the braided fan 110 directly affects the shape of the closing section 120. There are several ways: it is bound by a short developing tube or a developing spring, which plays a role in developing positioning and assists the operator in judging the wall adhesion effect. At this time, the closing section 120 is a loose braided wire 200. The developing tube or developing spring with spiral cutting patterns binds the braided wire 200 and directly covers the closing section 120, so that the entire closing section 120 has a developing effect and also increases rigidity; when the braided wire 200 is a developing material, the two bundles of braided wires 200 can be coated with a PTFE polymer film, and the conveying resistance can be effectively reduced when the closing section 120 is received in the sheath tube. The two bundles of braided wires 200 can be twisted together to achieve a binding effect, twisted in the same direction or interwoven with each other, and have a certain rigidity. Add a developing metal rod, and connect the braided wire 200 and the developing metal rod by winding or gluing or welding, which not only has a developing effect, but also the rigid material can improve the opening effect.

[0086] In this specific embodiment, the closing manner of the closing section 120 includes the braided wires 200 being bound into strands by the developing spring, the braided wires 200 being twisted into strands in the same direction, and the braided wires 200 being interwoven into strands.

[0087] According to the above embodiment, the thrombus capture device is an integrated braided design with good overall flexibility, not easy to bend or fold in the blood vessel, and better positioning ability. The wall-attached section of the thrombus capture device can be closely attached to the blood vessel wall after release, and the braided fan sheet 110 wraps the thrombus during recovery to prevent leakage, and the coaxial design makes it not easy to shift, greatly reducing the probability of leakage during surgery.

[0088] Furthermore, in this specific embodiment, the opening direction of the thrombus capture device is opposite to the direction of blood flow in the blood vessel. After the thrombus capture device is assembled with the delivery guide wire, it is released in the carotid artery. After the carotid stent is released at the lesion site, the thrombus capture device captures the thrombus at the distal end, and the wall-adhering section is in close contact with the blood vessel. The thrombus capturing section 100 captures the thrombus and then takes it out. After the thrombus capture device is released into place in the intracranial blood vessel through the microcatheter, the thrombus is coated to prevent the thrombus from escaping, thereby providing the necessary conditions for the subsequent removal of the thrombus.

[0089] According to the above embodiment, the following steps are included:

[0090] like Fig.11 and Fig.12 As shown, confirm that the fixing piece locks the delivery guide wire and the thrombus capturer, and then the delivery guide wire and the distal end of the braided single piece are integrally delivered to the distal end of the lesion through the guide wire.

[0091] In this step, their main responsibility is to lock the "delivery guidewire" and the "thrombus capture device" tightly and firmly together. This locking mechanism not only enhances the stability of the device structure, but also ensures the safety and accuracy of subsequent operations. Next, using the precise "guide wire" as a navigation tool, the operator can accurately control and guide the entire combination - that is, the distal part of the delivery guidewire and the thrombus capture device that have been locked together, through the complex biological structure until it is delivered to the distal location of the lesion, laying a solid foundation for subsequent treatment or diagnosis. The entire operation process is highly dependent on the stable locking function of the fixture and the precise navigation capability of the guide wire. The two work together to ensure that the medical device can reach the target lesion safely and accurately.

[0092] Unlock the fixing part and slowly withdraw the aspiration catheter to the proximal end of the lesion. At the same time, fix the delivery guide wire at the proximal end to release the thrombus capture device at the distal end of the lesion and open it smoothly to adhere to the wall.

[0093] This step marks the release of the previous stable locking state, providing a prerequisite for the subsequent operational changes. Unlocking the fixture requires precise control to ensure that while maintaining the overall stability of the device, the various components are allowed to move or separate as planned. "Slowly withdrawing the suction catheter" becomes a key step. During this process, the operator needs to withdraw the suction catheter from the lesion area at a steady and slow speed. The slow operating speed helps to reduce irritation or damage to the surrounding tissues, while ensuring that the suction catheter can be smoothly and orderly withdrawn to the proximal position of the lesion. "The thrombus capture device is released at the distal end of the lesion and smoothly opened to the wall." With the withdrawal of the suction catheter and the stable support of the delivery guide wire, the thrombus capture device is accurately released at the distal end of the lesion. Subsequently, the thrombus capture device is smoothly deployed in a preset manner until it is completely attached to the inner wall of the lesion area.

[0094] The thrombus capture device covers the thrombus, and the straight section 130 of the wall-adhering section adheres to the inner wall of the blood vessel, and the woven fan sheet 110 covers the thrombus to prevent the thrombus from escaping.

[0095] The embodiments of the present application have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The selection of terms used herein is intended to best explain the principles of the embodiments, practical applications, or improvements to the technology in the market, or to enable other persons of ordinary skill in the art to understand the embodiments disclosed herein.

Claims

1. A thrombus capture device, characterized in that: include: The bolt catching section, the wall-adhering section and the closing section; The bolt-catching section is a hollow structure with an opening at the proximal end and a gradually decreasing diameter at the distal end to form a cone; The wall-adhering section is woven along the proximal end of the bolt-catching section to form a mesh structure. The closing section is woven along the proximal end of the wall-adhering section and arranged in strands; The bolt catching section, the wall-adhering section and the closing section are integrally formed and woven.

2. The thrombus capture device according to claim 1, characterized in that: The wall-adhering section includes a woven fan and a straight section; The proximal end of the bolt-catching section is woven with the straight section of the wall-adhering section, and the straight section is a columnar hollow structure, and the diameters of the openings at both ends are the same; The straight section is open at one end away from the bolt-catching section and is woven with the woven fan sheet; Wherein, the woven fan sheet is in a mesh-like structure.

3. The thrombus capture device according to claim 1, characterized in that: The bolt catching section is cross-woven with braided wires; The plurality of braided wires are braided along the braiding direction of the bolt-catching section to form the braided fan pieces in a mesh-like structure; Or after the plurality of braided wires are used to braid the bolt catching section, the braided fan sheets are braided in sequence.

4. The thrombus capture device according to claim 1, characterized in that: The number of the braided wires is n, where n is a multiple of 2 and 3; The number of the braided sectors is s, the number s is greater than 2, and the number of braided wires in each of the braided sectors is n / s.

5. The thrombus capture device according to any one of claims 1 to 4, characterized in that: The proximal ends of the woven fan sheets converge into strands with the closing section, and the woven fan sheets are of a hollow structure.

6. The thrombus capture device according to claim 5, characterized in that: The braided fan sheet is formed by cross-weaving or sequentially weaving braided wires.

7. The thrombus capture device according to claim 6, characterized in that: The braided wires of the braided fan sheets are arc-shaped, cross-woven or sequentially braided, and symmetrically arranged on two opposite sides.

8. The thrombus capture device according to claim 5, characterized in that: The cross-sectional diameter of the plurality of braided sectors is equal to the cross-sectional diameter of the straight section.

9. The thrombus capture device according to claim 5, characterized in that: The closing section is woven from the braided wires of the wall-adhering section and extends a preset length relative to the wall-adhering section; A plurality of closing sections are bounded at one end away from the wall-adhering section.

10. The thrombus capture device according to any one of claims 1 to 4, characterized in that: The closing section has a preset length, and the proximal ends of two or more closing sections are fixed.

11. The thrombus capture device according to claim 2, characterized in that: The straight section is woven with a preset length.

12. The thrombus capture device according to claim 5, characterized in that: The braided wire is a material with shape memory properties such as nickel titanium, cobalt chromium, or a DFT braided wire containing an opaque component, or a mixture of shape memory braided wires such as nickel titanium, cobalt chromium, etc. and radiopaque braided wires such as platinum tungsten, platinum iridium, etc.

13. The thrombus capture device according to any one of claims 1 to 4, characterized in that: The bolt catching section is a braided wire woven in an axial direction, and presents a conical structure with one end open.

14. The thrombus capture device according to claim 5, characterized in that: The outer diameter of the straight section is in the range of 2 mm to 10 mm.

15. The thrombus capture device according to claim 5, characterized in that: The length of the thrombus capture device is in the range of 10 mm to 70 mm.

16. The thrombus capture device according to claim 5, characterized in that: The diameter of the strands of the braided wire is between 20 microns and 100 microns.

17. The thrombus capture device according to claim 5, characterized in that: The size of the woven mesh of the bolt-catching section is between 20 μm and μm.

18. The thrombus capture device according to any one of claims 1 to 4, characterized in that: Also includes: expansion ring; The expansion ring has a wavy structure, and the protrusion position of the expansion ring corresponds to the mesh structure of the woven fan sheet, and is woven in the straight section and the woven fan sheet.

19. The thrombus capture device according to claim 1, characterized in that: The braided wires of the closing section are bound into strands by a developing spring; Or the braided wires of the closing section are twisted into strands facing the same direction; Or the braided wires of the closing section are interwoven into strands.

20. The thrombus capture device according to any one of claims 5, characterized in that: The bolt catching section, the wall sticking section and the closing section are coaxially arranged.

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