Thrombus capture device

Abstract

The present application relates to a thrombus capture device, which comprises: a thrombus capture section, a wall-attaching section, and a closing section. The thrombus capture section is of a hollow structure with an open proximal end and a distal end gradually reduced in diameter to form a cone. The wall-attaching section is braided along the proximal end of the thrombus capture section to form a mesh cover structure, and the closing section is braided along a proximal end of the wall-attaching section and arranged as strands. The thrombus capture section, the wall-attaching section, and the closing section are integrally braided and coaxially arranged. The thrombus capture device is integrally braided, has good overall flexibility, and is not prone to bend and fold in a blood vessel, thereby avoiding affecting the thrombus capture; the wall-attaching section of the thrombus capture device can be tightly attached to the blood vessel wall after being released to prevent the thrombus from escaping; braided fan-shaped mesh segments wrap the thrombus during retrieval to prevent the thrombus from leaking; moreover, the coaxial design makes the thrombus capture device not easy to be displaced, thereby greatly enhancing the ability to capture the thrombus during surgery.

Description

Thrombus trap Technical Field

[0001] This application relates to the field of medical device technology, and more particularly to a thrombus capture device. Background Technology

[0002] Arterial stenosis refers to the thickening of the blood vessel wall and narrowing of the lumen caused by atherosclerosis, trauma, or other congenital factors, leading to ischemia in the organs or tissues supplied by the vessel. Balloon dilation, balloon dilatation stent placement, and stent placement are common procedures for treating vascular stenosis. During the procedure, dilation of the blood vessel can cause thrombi to detach. If the thrombus is not prevented from flowing distally with the blood flow, it can cause serious consequences such as cerebral infarction and myocardial infarction. Embolism protection devices are usually placed prophylactically distal to the lesion before balloon dilation or stent placement to capture any thrombi that detach during the procedure. However, with current devices, after capturing the thrombus, it is easy for the thrombus to escape between the device and the inner wall of the blood vessel, causing serious subsequent consequences. Summary of the Invention

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

[0004] According to one aspect of this application, a thrombus catcher is provided, comprising: a thrombus catching segment, a wall-adhering segment, and a closing segment;

[0005] The thrombus-catching section is a hollow structure with a proximal opening and a gradually decreasing diameter at the distal end, forming a cone shape.

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

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

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

[0009] In one possible implementation, the wall-mounted section includes woven fan blades and a straight section;

[0010] The proximal end of the thief section is woven with a straight section of the wall-adhering section, the straight section having a columnar hollow structure with the same diameter at both ends of the opening;

[0011] The straight section has an opening at the end away from the bolt section, and is woven with the woven fan blades;

[0012] The woven fan blades have a mesh-like structure.

[0013] In one possible implementation, the catching segment is made of cross-woven braided wires;

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

[0015] The braided section is woven with multiple braided wires, and then the braided fan blades are woven sequentially.

[0016] In one possible implementation, the number of braiding threads is n, where n is a multiple of 2 and 3;

[0017] The number of woven fan blades is s, where s is greater than 2, and the number of woven threads in each woven fan blade is n / s.

[0018] In one possible implementation, the near ends of the woven fan blades converge into the closing section, and the woven fan blades have a hollow structure.

[0019] In one possible implementation, the woven fan blade comprises a cross-woven or sequentially woven fabric composed of woven yarns.

[0020] In one possible implementation, the braided filaments of the woven fan blade are arc-shaped, woven in a crisscross or sequential manner, and arranged symmetrically on both sides.

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

[0022] In one possible implementation, the closing section is woven from the braided yarn of the wall-attached section and extends a predetermined length relative to the wall-attached section;

[0023] The ends of the multiple closing sections are bound away from the wall-attached sections.

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

[0025] In one possible implementation, the straight segment 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 or cobalt-chromium, or a DFT braided wire containing radiopaque components, or a mixture of shape memory braided wires such as nickel-titanium or cobalt-chromium with radiopaque braided wires such as platinum-tungsten or platinum-iridium.

[0027] In one possible implementation, the catcher section is a tapered structure with one end open, formed by braiding filaments along the axial direction.

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

[0029] In one possible implementation, the length of the thrombus catcher is in the range of 10mm-70mm.

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

[0031] In one possible implementation, the mesh size of the tethering section is between 20 μm and μm.

[0032] One possible implementation also includes: an expansion ring;

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

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

[0035] Alternatively, the braided yarns of the closing section may be twisted into strands in the same direction;

[0036] Alternatively, the braided threads of the closing section may be interwoven into strands.

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

[0038] The beneficial effects of the thrombus catcher in this application embodiment are as follows: the distal diameter of the thrombus catching section gradually decreases to a cone shape, which can more easily enter the thrombus site and improve the thrombus capture efficiency. Moreover, the thrombus catching section has a braided structure, which has good flexibility and axial compressive strength, and is not easy to collapse during pushing or retrieval, thus improving the thrombus capture effect. The wall-adhering section is set at the proximal end of the thrombus catching section, which can provide better radial support after thrombus capture, so that the thrombus catching section adheres tightly to the inner wall of the blood vessel and prevents thrombus escape. The closing section is used to fix it with the cutting tube of the thrombectomy device to realize the retrieval of the thrombus catcher. The structure is simple and reliable. The wall-adhering section can open when the wall-adhering section is stretched, further improving the adhesion between the thrombus catching section and the inner wall of the blood vessel and reducing the risk of thrombus escape.

[0039] Other features and aspects of this application will become clear from the following detailed description of exemplary embodiments with reference to the accompanying drawings. Attached Figure Description

[0040] The accompanying drawings, which are included in and form part of this specification, illustrate exemplary embodiments, features, and aspects of this application together with the specification and serve to explain the principles of this application.

[0041] Figure 1 shows a schematic diagram of the main structure of the thrombus capture device according to an embodiment of this application;

[0042] Figure 2 shows another schematic diagram of the main structure of the thrombus capture device according to an embodiment of this application;

[0043] Figure 3 shows a schematic diagram of the sequential weaving of the wall-attached section in an embodiment of this application;

[0044] Figure 4 shows a schematic diagram of the cross-woven main structure of the wall-attached section according to an embodiment of this application;

[0045] Figure 5 shows a schematic diagram of the main structure of the wall-attached section of this application, in which thicker braided yarns are inserted.

[0046] Figure 6 shows a schematic diagram of the main structure of the wall-mounted section with a fixing ring according to an embodiment of this application;

[0047] Figure 7 shows a schematic diagram of the top main structure of the thrombus capture device according to an embodiment of this application;

[0048] Figure 8 shows a schematic diagram of the main structure of the closing section according to an embodiment of this application;

[0049] Figure 9 shows a schematic diagram of the main structure of another section of the closing segment according to an embodiment of this application;

[0050] Figure 10 shows a schematic diagram of the main structure of another section of the closing segment according to an embodiment of this application;

[0051] Figure 11 shows a schematic diagram of the main structure of the thrombus catcher of this application for catching thrombi;

[0052] Figure 12 shows a schematic diagram of the main structure of the thrombus catcher of this application capturing another thrombus. Detailed Implementation

[0053] Various exemplary embodiments, features, and aspects of this application will now be described in detail with reference to the accompanying drawings. The same reference numerals in the drawings denote elements that have the same or similar functions. Although various aspects of the embodiments are shown in the drawings, they are not necessarily drawn to scale unless specifically indicated otherwise.

[0054] It should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the present invention or 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 present invention.

[0055] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0056] The term “exemplary” as used herein means “serving as an example, embodiment, or illustration.” Any embodiment illustrated herein as “exemplary” is not necessarily to be construed as superior to or better than other embodiments.

[0057] Furthermore, to better illustrate this application, numerous specific details are provided in the following detailed embodiments. Those skilled in the art should understand that this application can be implemented without certain specific details. In some instances, methods, means, components, and circuits well-known to those skilled in the art have not been described in detail in order to highlight the main points of this application.

[0058] As shown in Figure 1, the thrombus catcher of this application embodiment includes: a thrombus catching section 100, a wall-adhering section, and a closing section 120. The thrombus catching section 100 has a hollow structure with a proximal opening and a gradually decreasing diameter at the distal end, forming a cone shape. The wall-adhering section is woven along the proximal end of the thrombus catching section 100, forming a mesh structure. The closing section 120 is woven along the proximal end of the wall-adhering section, forming strands. The thrombus catching section 100, the wall-adhering section, and the closing section 120 are integrally formed and woven.

[0059] In this embodiment, the thrombus catcher is integrally woven, which has good overall flexibility and is not easy to bend or fold in the blood vessel, thus avoiding affecting thrombus capture. The wall-adhering section of the thrombus catcher can adhere tightly to the blood vessel wall after release to prevent thrombus escape. The woven fan 110 of the wall-adhering section wraps around the thrombus during retrieval to prevent thrombus leakage, and the coaxial design makes it not easy to shift. The intraoperative thrombus capture capability is greatly enhanced.

[0060] Specifically, in this embodiment, the distal diameter of the thrombus-catching segment 100 gradually decreases to a conical shape, which facilitates entry into the thrombus site and improves the thrombus capture efficiency. Furthermore, the thrombus-catching segment 100 has a woven structure, which has good flexibility and axial compressive strength, making it less prone to collapse during pushing or retrieval, thus improving the thrombus capture effect. The wall-adhering segment is woven at the proximal end of the thrombus-catching segment 100, which can provide better radial support after thrombus capture, allowing the thrombus-catching segment 100 to adhere tightly to the inner wall of the blood vessel and prevent thrombus escape. Moreover, the woven fan-shaped flaps 110 of the wall-adhering segment can open when the wall-adhering segment is stretched, further improving the adhesion between the thrombus-catching segment 100 and the inner wall of the blood vessel and reducing 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 to a closing ring 140 for connection with the delivery guidewire, completing the delivery of the thrombus catcher within the blood vessel. The closing section 120 enters the catheter first after the instrument catches the thrombus, acting as a closing mechanism. After the instrument is completely released, the wall-adhering section directly contacts the blood vessel wall to prevent thrombus escape. During retrieval, the woven fan-shaped section 110 can wrap around the thrombus to effectively prevent leakage. The thrombus-catching section 100 is a conical mesh bag used to hold the thrombus. The closing ring 140 binds the thrombus-catching section 100 and the closing section 120 by adhesive bonding or welding, leaving a cavity for the delivery guidewire with the delivery component to pass through, achieving the effect of delivery and retrieval within the blood vessel. The closing ring 140 is made of radiopaque material that is not X-ray resistant, used to assist the operator in positioning the instrument during the procedure, and contains precious metals such as platinum-iridium, platinum-tungsten, and tantalum.

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

[0063] In this specific embodiment, the proximal end of the thrombus-catching segment 100 is further woven with a straight section 130 that adheres to the vessel wall. The straight section 130 has a hollow annular structure and is woven to a predetermined length. When the thrombus-catching segment 100 extends, the straight section 130 can open accordingly, closely adhering to the inner wall of the blood vessel, effectively preventing thrombus escape, improving the wall-adhering performance of the thrombus catcher, and further enhancing its ability to capture thrombi.

[0064] Furthermore, in this specific embodiment, the straight section 130 is a hollow annular structure with the same diameter along its axial length, enabling it to adhere to the inner wall of the blood vessel. When the thrombus catcher is delivered to the thrombus location via a guidewire, the tapered thrombus-catching section 100 passes through the thrombus and opens the thrombus-embedded section, allowing the straight section 130 to adhere to the inner wall of the blood vessel, thus preventing thrombus escape.

[0065] Among them, the bolt-catching section 100 and the straight section 130 are integrally woven.

[0066] Furthermore, during the weaving process, the straight section 130 will make the proximal end of the braided structure straight, which will allow the proximal end to conform to the inner side of the blood vessel wall, preventing emboli from escaping between the braided structure and the blood vessel wall.

[0067] In this specific embodiment, the woven fan blade 110 has a mesh-like structure for capturing thrombi and preventing thrombus escape. Specifically, the interior of the woven fan blade 110 may be woven with thicker braided filaments 200 or incorporate wavy stabilizers to increase its rigidity, making it less prone to deformation and preventing deformation or displacement during thrombus capture. The woven fan blade 110 possesses sufficient flexibility and radial support to adapt to different vascular wall shapes while avoiding unnecessary damage to the blood vessel. The mesh-like structure of the woven fan blade 110 allows it to closely conform to the vascular wall during expansion and ensures its stability and reliability during delivery. This allows the woven fan blade 110 to undergo moderate elastic deformation under external force, resulting in a more uniform conformation to the vascular wall and avoiding the risk of localized over-expansion or compression.

[0068] The braided fan 110 continues to braid following the straight section 130 of the wall-attaching section, forming a straight and stable design. The braided fan 110 can closely adhere to the blood vessel wall, forming a barrier that conforms to the blood vessel wall, preventing small thrombi from passing through. This solves the problem that emboli may escape between the braided wire 200 and the blood vessel wall, ensuring the safety and effectiveness of the thrombectomy process. With the stable support of the braided fan 110, the braided wire 200 can maintain a stable posture in the complex intravascular environment, providing a solid foundation for subsequent thrombectomy operations.

[0069] Furthermore, as shown in Figure 6, the expansion ring has a "W" shaped structure. When it is woven into the apical segment, it can improve the expansion range and rigidity of the apical segment during expansion, making the apical segment adhere to the inner wall of the blood vessel more evenly and stably during expansion, thereby further reducing surgical risks.

[0070] In one specific embodiment, the thrombus-catching section 100 is composed of cross-woven braided wires 200. Multiple braided wires 200 are woven along the braiding direction of the thrombus-catching section 100 to form a wall-adhering section with a mesh-like structure. The wall-adhering section is woven in the same way as the thrombus-catching section 100, with the braided wires 200 interwoven. Specifically, when weaving the wall-adhering section, the braided wires 200 employ a denser cross-weaving method to form tightly connected meshes. These meshes not only possess sufficient strength and stability to adhere tightly to the vessel wall and prevent thrombus escape, but also have a certain degree of elasticity to adapt to minor deformations of the vessel wall, ensuring the stability and durability of the capture device within the vessel. Simultaneously, when weaving the wall-adhering section, the braided wires 200 adjust the size and shape of the mesh according to the curvature and diameter of the vessel wall. This design allows the wall-adhering section to better adapt to vessels in different locations, improving the versatility and applicability of the capture device.

[0071] In another specific embodiment, the thrombectomy segment 100 is formed by cross-woven braided wires 200. After multiple braided wires 200 weave the thrombectomy segment 100, a wall-adhering segment is sequentially woven in. That is, the braided wires 200 used to weave the wall-adhering segment do not cross each other. Specifically, after the thrombectomy segment 100 is completed, the wall-adhering segment is woven in sequence. This method is generally suitable for situations requiring longer wall-adhering segments or more complex wall-adhering structures. After the thrombectomy segment 100 is woven, the braided wires 200 continue along the end of the thrombectomy segment 100 to begin weaving the wall-adhering segment. During the sequential weaving of the wall-adhering segment, the braided wires 200 maintain a certain tension and angle to ensure that the wall-adhering segment can fit tightly against the vessel wall. At the same time, the braided wires 200 adjust the weaving density and shape according to the needs of the wall-adhering segment to form the required mesh-like structure.

[0072] Among them, the thrombus-catching section 100 of the thrombus catcher is shaped like a conical net. There are two ways to form it: one is to directly bind the end with a closing ring 140 to form a natural conical section, and the other is to heat-treat the regularly woven round tube onto the conical mold and then heat-treat and shape it to form a conical section controlled by the mold, and then put the closing ring 140 on it.

[0073] In one specific embodiment, as shown in Figures 1, 2, 3, and 4, there are two or more braided fan blades 110, which can be two, three, or four, depending on the size of the thrombus inside the blood vessel and its adhesion to the vessel wall. Specifically, the number of braided fan blades 110 is determined by the total number of braided filaments 200. The number of braided filaments 200 used to braid the thrombus-catching segment 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. Therefore, the number of braided filaments 200 in each braided fan blade 110 is n / s. Thus, the number of braided fan blades 110 is related to the total number of braided filaments 200.

[0074] In one specific embodiment, the wall-adhering section extends away from the thrombus-catching section 100 and has a constriction section 120. The constriction section 120 is a long strip woven structure formed by strands of the wall-adhering section. Specifically, the constriction section 120 has a preset length, and the proximal ends of two or more constriction sections 120 are fixed to facilitate connection with the delivery device. The wall-adhering section, the constriction section 120, and the thrombus-catching section 100 are then opened to capture the thrombus.

[0075] In one specific embodiment, the braided filament 200 is a material with shape memory properties such as nickel-titanium or cobalt-chromium, or a DFT braided filament 200 containing radiopaque components, or a mixture of shape memory braided filaments 200 such as nickel-titanium or cobalt-chromium and radiopaque braided filaments 200 such as platinum-tungsten or platinum-iridium.

[0076] Among them, the braided wire 200 is a metal braided wire material with shape memory capability, meaning that after being deformed under external force, it can recover its original shape through heating or other stimulation. Therefore, the braided wire 200 can automatically adjust its shape when subjected to external force or environmental changes, 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 one specific embodiment, the thrombectomy segment 100 is made of braided filaments 200 woven along the axial direction, forming a tapered structure with one open end. As the distal portion of the braided filaments 200, the thrombectomy segment 100 employs a high-density braiding design. This design not only enhances the strength and toughness of the thrombectomy segment 100 but also endows it with superior capture capabilities. During aspiration and thrombectomy, the thrombectomy segment 100 can effectively intercept and capture potentially escaping microemboli, acting like a precise capture net. If these microemboli are not captured in time, they may enter distal blood vessels with the bloodstream, leading to serious consequences such as vascular occlusion. The high-density braided filaments 200 of the thrombectomy segment 100 can minimize this risk, ensuring the thoroughness and safety of the thrombectomy process.

[0078] In one specific embodiment, the stranded wall-adhering section is woven with braided fan blades 110. The braided fan blades 110 have a hollow structure, and the number of braided fan blades 110 is equal to the number of braided filaments 200 in the braided thrombus-catching section 100. The wall-adhering section has an overall mesh structure with hollowed-out braided fan blades 110. The braided aperture is larger than that of the thrombus-catching section 100, which facilitates the braided fan blades 110 to partially cover the thrombus and easily deform to lift and cover the thrombus.

[0079] Furthermore, the woven fan blade 110 is made of woven or sequentially woven filaments 200.

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

[0081] The length of the thrombus trap is in the range of 10mm-70mm.

[0082] Among them, the diameter of the filaments of braided yarn 200 is between 20 micrometers and micrometers.

[0083] The mesh size of the tethering section 100 is between 20μm and μm.

[0084] In one specific embodiment, as shown in Figure 5, the braided wires 200 of the thrombus capture device are woven with thicker braided wires 200, which can increase the wall adhesion effect of the straight section 130 and prevent thrombus leakage. The edge braided wires 200 of the braided fan 110 can be braided wires 200 with a thicker diameter, and the edge braided wires 200 of the braided fan 110 can also be imaging wires, which can not only provide overall imaging effect, but also help the operator judge the opening status of the wall-adhering section.

[0085] In one specific embodiment, as shown in Figures 7, 8, 9, and 10, the binding method of the end of the braided fan 110 directly affects the shape of the closing section 120. Several methods exist: First, binding with a short imaging tube or imaging spring serves as a positioning tool, assisting the surgeon in judging the adhesion effect. In this case, the closing section 120 consists of loosely braided filaments 200. Second, an imaging tube or imaging spring with spiral cutting patterns binds the braided filaments 200 and directly covers the closing section 120, providing imaging effect while increasing rigidity. Third, when the braided filaments 200 are imaging material, two bundles of braided filaments 200 can be coated with a PTFE polymer film, effectively reducing transport resistance when the closing section 120 is retracted into the sheath. Fourth, two bundles of braided filaments 200 can be twisted together to achieve a binding effect, twisted in the same direction or interwoven, providing a certain degree of rigidity. Fifth, adding an imaging metal rod, connecting the braided filaments 200 to the imaging metal rod through winding, adhesive bonding, or welding, provides both imaging effect and improved opening efficiency due to the rigid material.

[0086] In this specific embodiment, the closing method of the closing section 120 includes the following: the braided filaments 200 are bound into strands by the developing spring; the braided filaments 200 are twisted into strands in the same direction; and the braided filaments 200 are interwoven into strands.

[0087] According to the above embodiments, the thrombus catcher features an integrated braided design, offering excellent overall flexibility and preventing bending or kinking within the blood vessel, thus improving its positioning capability. The wall-adhering section of the thrombus catcher adheres tightly to the vessel wall after release, while the braided fan 110 wraps around the thrombus during retrieval to prevent leakage. Furthermore, its coaxial design makes it less prone to displacement, significantly reducing the probability of intraoperative thrombus leakage.

[0088] Furthermore, in this specific embodiment, the opening direction of the thrombus catcher is opposite to the blood flow direction in the blood vessel. After the thrombus catcher is assembled with the delivery guidewire, it is released into the carotid artery. After the carotid artery stent is released at the lesion site, the thrombus catcher captures the thrombus distally. The wall-adhering segment is closely attached to the blood vessel. After the thrombus catching segment 100 captures the thrombus, it is removed. Moreover, after the thrombus catcher is released into place in the intracranial blood vessel through a microcatheter, it covers the thrombus to prevent thrombus escape and provides the necessary conditions for subsequent thrombus removal.

[0089] According to the above embodiments, the usage steps include the following:

[0090] As shown in Figures 11 and 12, the fixation device is confirmed to lock the delivery guidewire and thrombus capture device. Then, the delivery guidewire and the distal end of the braided single are delivered to the distal position of the lesion through the guidewire.

[0091] In this step, their primary function is to securely and tightly lock the guidewire and thrombus trap 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 guidewire as a navigation tool, the operator can accurately control and guide the entire assembly—the locked guidewire and the distal portion of the thrombus trap—through complex biological structures until it reaches the distal location of the lesion, laying a solid foundation for subsequent treatment or diagnostic work. The entire procedure relies heavily on the stable locking function of the fixation components and the precise navigation capability of the guidewire; the two work together to ensure that the medical device can safely and accurately reach the target lesion.

[0092] Unlock the fixation device and slowly retract the aspiration catheter to bring it back to the proximal end of the lesion. At the same time, fix the guidewire at the proximal end to allow the thrombus trap to be released at the distal end of the lesion and smoothly open to the wall.

[0093] This step marks the release of the previously secured locking state, providing a basis for subsequent operational changes. Unlocking the fixation device requires precise control to ensure that individual components can move or separate according to the predetermined plan while maintaining the overall stability of the device. "Slowly withdrawing the aspiration catheter" becomes a crucial step. During this process, the operator must withdraw the aspiration catheter from the lesion area at a steady and slow speed. The slow speed helps reduce irritation or damage to surrounding tissues while ensuring that the aspiration catheter can be smoothly and orderly withdrawn to a position proximal to the lesion. "Deploying the thrombus trap distal to the lesion and smoothly opening it to the wall," with the withdrawal of the aspiration catheter and the stable support of the delivery guidewire, the thrombus trap is precisely released distal to the lesion. Subsequently, the thrombus trap smoothly unfolds according to the preset method until it is completely attached to the inner wall of the lesion area.

[0094] The thrombus trap encapsulates the thrombus, and the straight section 130 of the wall-mounted segment adheres to the inner wall of the blood vessel. The woven fan 110 encapsulates the thrombus to prevent it from escaping.

[0095] The various embodiments of this application have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical application, or improvement of the technology in the market, or to enable others skilled in the art to understand the embodiments disclosed herein.

Claims

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

2. The thrombus trap according to claim 1, characterized in that, The wall-mounted section includes woven fan blades and a straight section; The proximal end of the thief section is woven with a straight section of the wall-adhering section, the straight section having a columnar hollow structure with the same diameter at both ends of the opening; The straight section has an opening at the end away from the bolt section, and is woven with the woven fan blades; The woven fan blades have a mesh-like structure.

3. The thrombus capture device according to claim 1, characterized in that, The bolt-catching section is made of cross-woven braided wires; The plurality of braided filaments are woven along the braiding direction of the bolt-catching section to form a braided fan with a mesh-like structure; The braided section is woven with multiple braided wires, and then the braided fan blades are woven sequentially.

4. The thrombus trap according to claim 1, characterized in that, The number of braiding threads is n, where n is a multiple of 2 and 3; The number of woven fan blades is s, where s is greater than 2, and the number of woven threads in each woven fan blade is n / s.

5. The thrombus trap according to any one of claims 1-4, characterized in that, The near end of the woven fan blades converges into a strand with the closing section, and the woven fan blades have a hollow structure.

6. The thrombus trap according to claim 5, characterized in that, The woven fan blades are made of cross-woven or sequentially woven filaments.

7. The thrombus trap according to claim 6, characterized in that, The braided filaments of the woven fan blades are arc-shaped, woven in a crisscross or sequential manner, and arranged symmetrically on both sides.

8. The thrombus trap according to claim 5, characterized in that, The cross-sectional diameter of the plurality of woven fan blades is equal to the cross-sectional diameter of the straight section.

9. The thrombus trap according to claim 5, characterized in that, The closing section is woven from the braided yarn of the wall-attached section and extends a predetermined length relative to the wall-attached section. The ends of the multiple closing sections are bound away from the wall-attached sections.

10. The thrombus trap according to any one of claims 1-4, characterized in that, The closing segment has a preset length, and the proximal ends of two or more closing segments are fixed.

11. The thrombus trap according to claim 2, characterized in that, The straight sections are woven to a preset length.

12. The thrombus trap according to claim 5, characterized in that, The braided wire is a material with shape memory properties such as nickel-titanium or cobalt-chromium, or a DFT braided wire containing radiopaque components, or a mixture of shape memory braided wires such as nickel-titanium or cobalt-chromium with radiopaque braided wires such as platinum-tungsten or platinum-iridium.

13. The thrombus trap according to any one of claims 1-4, characterized in that, The catcher section is made of braided wires woven along the axial direction, forming a conical structure with one end open.

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

15. The thrombus trap according to claim 5, characterized in that, The length of the thrombus catcher is in the range of 10mm-70mm.

16. The thrombus trap according to claim 5, characterized in that, The diameter of the braided filaments is between 20 micrometers and 100 micrometers.

17. The thrombus trap according to claim 5, characterized in that, The mesh size of the tethering section is between 20 μm and μm.

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

19. The thrombus trap according to claim 1, characterized in that, The braided yarns of the closing section are bound into strands by a developing spring; Alternatively, the braided yarns of the closing section may be twisted into strands in the same direction; Alternatively, the braided threads of the closing section may be interwoven into strands.

20. The thrombus trap according to any one of claims 5, characterized in that, The bolt-catching section, the wall-adhering section, and the closing section are arranged coaxially.

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