Thrombus removal device

Abstract

This disclosure provides a plug removal device, which includes a plug filter section, the plug filter section including a filter body and a first converging end, the first converging end being used to bind one end of the filter body; and a plug breaker section, the distal end of which is connected to the first converging end, the plug breaker section being configured to rotate relative to the plug filter section.

Description

Technical Field

[0001] This disclosure relates to the field of medical device technology, and more specifically, to a thrombectomy device. Background Technology

[0002] Mechanical thrombectomy is a technique that involves puncturing an artery, inserting a thrombectomy instrument through the blood vessel to the location of the occlusion, and then removing the thrombus through the instrument or catheter, thereby restoring blood flow to the vessel.

[0003] Current mechanical thrombectomy primarily involves first using a thrombectomy device to break up the thrombus, and then removing the broken thrombus using a thrombectomy device. The proximal end of the thrombectomy device is connected to a drive mechanism to rotate it, while the distal end is a free end.

[0004] However, during the operation of the thrombectomy device, the distal end of the device is prone to swaying and deviating from the central axis of the device, which can easily damage the outer wall of the blood vessel. Summary of the Invention

[0005] One objective of this disclosure is to provide a new technical solution for a thrombus removal device.

[0006] In one embodiment of this disclosure, a plug removal device is provided, the plug removal device comprising: a plug filter section, the plug filter section including a filter body and a first converging end, the first converging end being used to bind one end of the filter body; and a plug breaker section, the distal end of the plug breaker section being connected to the first converging end, the plug breaker section being configured to be rotatable relative to the plug filter section.

[0007] Optionally, the distal end of the fragmented plug is magnetically connected to the first converging end.

[0008] Optionally, a first magnetic element is provided at the distal end of the broken plug portion, and a second magnetic element is provided at the end where the first converging end is connected to the distal end of the broken plug portion, wherein the first magnetic element and the second magnetic element are magnetically connected.

[0009] Optionally, a ball socket is provided at one of the first converging end and the distal end of the broken plug, and a ball head is provided at the other end to match the ball socket. The filter plug and the broken plug are connected by the ball socket and the ball head.

[0010] Optionally, the first receiving end includes a ball-shaped cavity and a sidewall portion surrounding the ball-shaped cavity, the ball-shaped cavity and the sidewall portion forming a cavity with an open end, and the ball head is located in the cavity.

[0011] Optionally, the end of the sidewall portion is bent inward to form a concave opening, and the concave opening forms a limiting fit with the ball head.

[0012] Optionally, a first magnetic element is provided on the inner wall of the ball socket, and the ball head is a second magnetic element, wherein the first magnetic element and the second magnetic element are magnetically connected; wherein the first magnetic element is disposed on the inner surface of the ball socket; or, a groove is constructed on the inner wall of the ball socket, and the first magnetic element is disposed in the groove; wherein the height of the first magnetic element is less than the depth of the groove.

[0013] Optionally, the filter plug is configured to expand radially along the blood vessel; wherein the filter body includes: a plurality of first filter units; and a plurality of second filter units; in the expanded state of the filter plug, the plurality of first filter units are arranged circumferentially along the filter plug to form a first filter, and the plurality of second filter units are arranged circumferentially along the filter plug to form a second filter, the first filter and the second filter are arranged opposite to each other along the axial direction of the filter plug; wherein both the first filter unit and the second filter unit are provided with mesh, and the size of the mesh of the first filter unit is larger than the size of the mesh of the second filter unit.

[0014] Optionally, the filter body includes a plurality of beams, which are spaced apart circumferentially along the filter plug portion. The end of the first filter portion is connected to one end of the plurality of beams, and the second filter portion is connected to the other end of the plurality of beams. A barbed structure is provided on the outer wall of the beam. When the filter plug portion is inflated, a portion of the beam can contact the inner surface of the blood vessel sidewall, and the barbed structure is configured to be able to pierce the sidewall of the blood vessel.

[0015] Optionally, the fragmented portion is configured to expand radially, and the fragmented portion has an S-shaped structure in the expanded state, with the distal end of the S-shaped structure connected to the first converging end.

[0016] By fixing the distal end of the thrombus fragments with a filter thrombus, it prevents the distal end of the fragments from swaying and deviating from its central axis when rotating without support. This avoids damage to the inner wall of the blood vessel from the distal end of the fragments.

[0017] Other features and advantages of this specification will become clear from the following detailed description of exemplary embodiments with reference to the accompanying drawings. Attached Figure Description

[0018] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments of this specification and, together with their description, serve to explain the principles of this specification.

[0019] Figure 1 This is a schematic diagram of the thrombus removal device in the embodiments of this disclosure;

[0020] Figure 2 yes Figure 1 One of the magnified views of a portion of B in the image;

[0021] Figure 3 yes Figure 1 The second magnified view of a portion of B in the image.

[0022] Explanation of reference numerals in the attached figures:

[0023] 10. Filter plug section; 11. First gathering end; 12. Ball socket section; 13. Ball head; 14. Side wall section; 15. First magnetic element; 16. Second magnetic element; 17. Narrowing opening;

[0024] 20. Fragmented thrombus;

[0025] 32. First filter unit; 33. Second filter unit; 34. First filter section; 35. Beam; 36. Second filter section; 37. Mesh; 38. Barbed structure. Detailed Implementation

[0026] Embodiments of this disclosure will now be described in detail. Examples of these embodiments are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this disclosure, and should not be construed as limiting this disclosure. All other embodiments obtained by those skilled in the art based on the embodiments of this disclosure without inventive effort are within the scope of protection of this disclosure.

[0027] The terms "first" and "second" in this disclosure may explicitly or implicitly include one or more of the features. In the description of this disclosure, unless otherwise stated, "a plurality of" means two or more.

[0028] In the description of this disclosure, it should be understood that the terms "center," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "central axis," 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 this disclosure and simplifying the description, and are not intended to 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 this disclosure.

[0029] In the description of this disclosure, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linkage" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this disclosure based on the specific circumstances.

[0030] According to one embodiment of this disclosure, a thrombus removal device is provided. Figure 1 As shown, the plug removal device includes a plug filter section 10 and a plug breaker section 20. The plug filter section 10 includes a filter body and a first converging end 11. The first converging end 11 is used to bind one end of the filter body. The distal end of the plug breaker section 20 is connected to the first converging end 11, and the plug breaker section 20 is configured to rotate relative to the plug filter section 10.

[0031] The thrombus fragmentation section 20 is a component used to break up blood clots.

[0032] For example, the proximal end of the break-off section 20 is connected to a drive device, which provides power to the break-off section 20 so that the break-off section 20 can rotate about the central axis A.

[0033] The filter plug section 10 is used to filter and collect thrombi broken up by the fragmentation plug section 20. The first constriction end 11 is used to bind the end of the filter plug body.

[0034] The distal end of the fragmented part 20 refers to the end of the fragmented part 20 that is farther away from the operator.

[0035] For example, both the plug breakage portion 20 and the plug filter portion 10 are elastic. Under the action of an external force, the plug filter portion 10 and the plug breakage portion 20 can deform. When the external force is removed, the plug filter portion 10 and the plug breakage portion 20 can return to their predetermined shape.

[0036] For example, the break plug portion 20 and the filter plug portion 10 are made of shape memory alloys, such as nickel-titanium alloys.

[0037] In actual use, the thrombectomy device is first placed in the catheter. At this time, the fragmented thrombectomy section 20 and the filter thrombectomy section 10 are restrained by the catheter, and the thrombectomy device is in a compressed state. The catheter is then inserted into the patient's blood vessel, and pulled open at the distal end of the thrombus to release the thrombectomy device. The distal end of the thrombus refers to the position of the thrombectomy device at the front end of the thrombus along the direction of blood flow. After the thrombectomy device is released, the fragmented thrombectomy section 20 and the filter thrombectomy section 10 expand radially along the blood vessel. The expanded filter thrombectomy section 10 can be fixed in the blood vessel, and the expanded fragmented thrombectomy section 20 can rotate within the blood vessel.

[0038] The distal end of the thrombus fragmentation section 20 and the first converging end 11 are rotatable, while the thrombus filtering section 10 remains stationary. The thrombus fragmentation section 20 can rotate within the blood vessel around its central axis A, thereby breaking up the thrombus within the blood vessel.

[0039] In this way, the distal end of the fragmented thrombus 20 is fixed by the filter thrombus 10, preventing the distal end of the fragmented thrombus 20 from swinging and deviating from the central axis A when it rotates without support. This avoids damage to the inner wall of the blood vessel when the distal end of the fragmented thrombus 20 deviates from the central axis A.

[0040] Furthermore, by connecting the distal end of the break-up section 20 to the fixed filter section 10, the fixed filter section 10 provides a fulcrum for the break-up section 20, thereby increasing the break-up force of the break-up section 20.

[0041] Furthermore, by connecting the thrombus fragmentation section 20 and the thrombus filter section 10, the fragmented thrombus is collected by the thrombus filter section 10, and the thrombus fragmentation section 20 and the thrombus filter section 10 can be entered and retrieved at the same time, which improves the thrombus fragmentation efficiency and reduces the number of traumas.

[0042] In one example, such as Figure 1 As shown, the distal end of the puncture section 20 is magnetically connected to the first converging end 11.

[0043] For example, a first magnetic element 15 is provided at the distal end of the break-off portion 20, and the first converging end 11 is made of a material that can be attracted by the first magnetic element 15.

[0044] Optionally, a first magnetic element 15 is provided at the first converging end 11, and the broken bolt portion 20 is made of a material that can be attracted by the first magnetic element 15.

[0045] Thus, when the distal end of the break-off portion 20 approaches the first convergence end 11, under the action of the first magnetic element 15, the distal end of the break-off portion 20 forms a connection with the first magnetic element 15. This increases the connection efficiency and connection strength between the break-off portion 20 and the first convergence end 11, allowing the distal end of the break-off portion 20 to form a more precise connection with the first convergence end 11.

[0046] In one example, a first magnetic element 15 is provided at the distal end of the break-off section 20, and a second magnetic element 16 is provided at the end of the first converging end 11 that is connected to the distal end of the break-off section 20. The first magnetic element 15 and the second magnetic element 16 are magnetically connected.

[0047] Specifically, the side of the first magnetic element 15 near the first convergence end 11 has opposite magnetic properties to the side of the second magnetic element 16 near the break-off portion 20. When the distal end of the break-off portion 20 is brought close to the first convergence end 11, an attractive force is generated between the first magnetic element 15 and the second magnetic element 16, attracting the distal end of the break-off portion 20 to the first convergence end 11 to form a magnetic connection.

[0048] In this way, the connection strength between the filter plug 10 and the broken plug 20 is increased.

[0049] In one example, such as Figure 2 and Figure 3 As shown, a ball-and-socket portion 12 is provided at one of the distal ends of the first converging end 11 and the break-up portion 20. The other end is provided with a ball head 13 that matches the ball-and-socket portion 12. The filter plug portion 10 and the break-up portion 20 are connected by the ball-and-socket portion 12 and the ball head 13.

[0050] For example, a ball socket 12 is provided at the first converging end 11, and a ball head 13 is provided at the distal end of the break-bolt portion 20.

[0051] Optionally, a ball socket 12 is provided at the distal end of the break-off portion 20, and a ball head 13 is provided at the first convergence end 11.

[0052] Specifically, the ball head 13 can be integrally formed with the first convergent end 11 or the distal end of the break-off portion 20. Alternatively, the ball head 13 can be welded to the distal end of the break-off portion 20, or the ball head 13 can be welded to the end of the first convergent end 11 that connects to the distal end of the break-off portion 20.

[0053] In this way, during thrombectomy, the filter 10 remains in a supporting position against the blood vessel, preventing rotation. The distal end of the fragmentation section 20 connects to the filter 10. When the fragmentation section 20 is driven to rotate, the ball head 13 can rotate within the ball socket 12. The stationary filter 10 supports the distal end of the fragmentation section 20. This prevents the distal end of the fragmentation section 20 from shifting away from its central axis A during thrombectomy due to lack of support, thus preventing damage to the blood vessel.

[0054] Furthermore, the broken plug section 20 and the filter plug section 10 are rotatably connected by a ball socket and a ball head, which reduces the resistance to rotation of the broken plug section 20.

[0055] In one example, such as Figure 2 and Figure 3 As shown, the first receiving end 11 includes a ball-shaped cavity portion 12 and a side wall portion 14 surrounding the ball-shaped cavity portion 12. The ball-shaped cavity portion 12 and the side wall portion 14 form a cavity with an open end, and the ball head 13 is located in the cavity.

[0056] For example, a gap is formed between the inner wall of the sidewall portion 14 and the ball head 13, and the sidewall portion 14 covers the ball head 13. The ball socket portion 12 and the sidewall portion 14 form a U-shaped concave cavity. The ball head 13 is located in the cavity, and the ball head 13 and the ball socket portion 12 form a rotational fit.

[0057] This prevents the ball head 13 from rotating circumferentially around the first converging end 11. The sidewall portion 14 limits the sidewall of the ball head 13, allowing it to rotate within the concave cavity. By limiting the radial direction of the ball head 13, it prevents the ball head 13 from causing the fragmentation portion 20 to rotate away from its central axis A, thus avoiding damage to the inner wall of the blood vessel.

[0058] In addition, it can further prevent the distal end of the broken plug 20 from swinging, and at the same time, prevent the ball head 13 from sliding out of the ball socket.

[0059] In one example, such as Figure 3 As shown, the end of the sidewall portion 14 is bent inward to form a concave opening 17, which forms a limiting fit with the ball head 13.

[0060] For example, the axial distance between the constriction 17 and the ball-shaped socket 12 is greater than or equal to the diameter of the ball head 13. The inner diameter of the constriction 17 is smaller than the diameter of the ball head 13. The axial distance between the constriction 17 and the ball-shaped socket 12 refers to the distance between the position where the constriction 17 overlaps with the central axis A of the first convergence end 11 and the position where the ball-shaped socket 12 overlaps with the central axis A of the first convergence end 11.

[0061] Alternatively, the distance between the constriction 17 and the ball socket 12 can be the same as the diameter of the ball head 13. In this way, the ball head 13 is confined within the concave cavity by the ball socket 12 and the constriction 17.

[0062] This prevents the ball head 13 from moving axially along the first converging end 11. When the bolt removal device is pulled outward, the constriction 17 forms a stop on the ball head 13, preventing the ball head 13 from coming out of the ball socket.

[0063] Alternatively, the distance between the constriction 17 and the ball socket 12 may be greater than the diameter of the ball head 13.

[0064] In this way, the ball head 13 can move along the axial direction of the cavity during rotation or under the action of external force.

[0065] In one example, such as Figure 2 and Figure 3 As shown, a first magnetic element 15 is provided on the inner wall of the ball socket 12, and a second magnetic element 16 is provided on the ball head 13. The first magnetic element 15 and the second magnetic element 16 are magnetically connected. The first magnetic element 15 is provided on the inner surface of the ball socket 12.

[0066] For example, a first magnetic element 15 is provided on the upper surface of the ball socket. The first magnetic element 15 has an arc and matches the bottom surface of the ball socket. The ball head 13 is a second magnetic element 16. The ball head 13 is welded to the distal end of the break pin portion 20.

[0067] By providing a first magnetic element 15 matching the curvature of the ball socket on the upper surface of the ball socket portion 12, and a second magnetic element 16 for the ball head 13, the ball head 13 can rotate within the first magnetic element 15 while forming a magnetic connection with the ball socket portion 12.

[0068] Optionally, a groove is formed on the inner wall of the ball socket 12, and the first magnetic element 15 is disposed in the groove. The height of the first magnetic element 15 is less than the depth of the groove.

[0069] Here, the cross-sectional shape of the groove is not specifically limited, as long as it can form a magnetic connection with the second magnetic element 16, i.e., the ball head 13.

[0070] In this way, the volume of the first magnetic element 15 is reduced, and the weight of the first converging end 11 is reduced.

[0071] For example, the first magnetic element 15 is embedded in the groove, and the height of the first magnetic element 15 is less than the depth of the groove.

[0072] In this way, by avoiding increasing the thickness of the socket, the first magnetic element 15 can be prevented from protruding from the upper surface of the socket portion 12.

[0073] In one example, such as Figure 1 As shown, the filter plug portion 10 is configured to expand radially along the blood vessel. The filter plug portion 10 includes a filter plug body, which includes a plurality of first filter units 32 and a plurality of second filter units 33.

[0074] With the filter plug portion 10 in an expanded state, a plurality of first filter units 32 are arranged circumferentially along the filter plug portion 10 to form a first filter portion 34, and a plurality of second filter units 33 are arranged circumferentially along the filter plug portion 10 to form a second filter portion 36. The first filter portion 34 and the second filter portion 36 are arranged opposite each other along the axial direction of the filter plug portion 10.

[0075] Both the first filter unit 32 and the second filter unit 33 are provided with mesh 37, and the size of the mesh 37 of the first filter unit 32 is larger than the size of the mesh 37 of the second filter unit 33.

[0076] For example, when the filter plug 10 is in an expanded state, the first filter 34 is located on the side closer to the distal end of the broken plug 20, and the second filter 36 is located on the side farther away from the distal end of the broken plug 20.

[0077] For example, the first filter unit 32 and the second filter unit 33 are rhomboid in shape. The size of the first filter unit 32 is larger than the size of the second filter unit 33. Both the first filter unit 32 and the second filter unit 33 have mesh openings 37. Multiple first filter units 32 are connected in sequence in an expanded state to form a mesh structure for the first filter section 34. Multiple second filter units 33 are connected in sequence in an expanded state to form a mesh structure for the second filter section 36.

[0078] For example, the first constricting end 11 binds the end of the first filter section 34 that is away from the beam 35. In the expanded state, this forms a conical structure for the first filter section 34. A second constricting end is provided at the end of the second filter section 36 that is away from the beam 35. The second constricting end forms a conical structure for the second filter section 36. The filter body includes a plurality of beams 35, which are spaced apart circumferentially along the filter plug section 10. The end of the first filter section 34 is connected to one end of the plurality of beams 35, and the second filter section 36 is connected to the other end of the plurality of beams 35.

[0079] like Figure 1 As shown, the distal end of the thrombus fragmentation section 20 is connected to the end of the first filter section 34 away from the beam 35 via the first converging end 11. In actual operation, the thrombus removal device is placed at the front end of the thrombus along the blood flow direction. Figure 1 The direction indicated by the middle arrow is the direction of blood flow. The proximal end of the thrombus fragmentation section 20 approaches the thrombus and begins to rotate to break it up. The thrombus fragments are carried by the blood flow into the first filter section 34, and then, through the mesh of the first filter section 34, are further flushed into the mesh of the second filter section 36. Because the mesh of the second filter section 36 is small, it can collect the thrombus fragments on the mesh.

[0080] In this state, with the thrombus fragmentation section 20 connected to the thrombus filter section 10, the thrombus filter section 10 provides support to the distal end of the thrombus fragmentation section 20 while simultaneously enabling the rapid collection of thrombi fragmented by the thrombus fragmentation section 20 into the thrombus filter body. This improves the efficiency of the thrombus filter section 20 in collecting thrombi.

[0081] In this way, the first filter section 34 is able to allow blood clots to pass through, and the second filter unit 33 is used to collect the blood clots that have passed through the first filter section 34.

[0082] In this way, the filter body can collect the thrombus fragments broken up by the fragmentation section 20. After being collected, the thrombus can be carried out of the body along with the catheter.

[0083] In one example, such as Figure 1As shown, the filter body includes multiple beams 35, which are spaced apart circumferentially along the filter plug portion 10. The end of the first filter portion 34 is connected to one end of each of the multiple beams 35, and the second filter portion 36 is connected to the other end of each of the multiple beams 35. A barbed structure 38 is provided on the outer wall of each beam 35. When the filter plug portion 10 is inflated, a portion of the beam 35 can contact the inner surface of the blood vessel sidewall, and the barbed structure 38 is configured to pierce the sidewall of the blood vessel.

[0084] In this way, multiple beams 35 expand the blood vessel radially. The first filter section 34 is located at the proximal end of the beam 35, and the second filter section 36 is located at the distal end of the beam 35.

[0085] This allows the second filtration section 36 to collect the broken-up blood clots more effectively.

[0086] For example, a recess is provided at a position corresponding to the barb structure 38. When the filter plug 10 is closed, the barb structure 38 can be accommodated in the recess. When the filter plug 10 is expanded, the barb structure 38 protrudes from the surface of the beam 35.

[0087] In this way, the connection strength between the filter plug 10 and the blood vessel can be further increased, while the barb structure 38 can be easily stored, avoiding contact between the barb structure and the inner wall of the catheter when it is bound inside the catheter.

[0088] In one example, such as Figure 1 As shown, the fragmented part 20 is configured to expand radially, and the fragmented part 20 has an S-shaped structure in the expanded state, with the distal end of the S-shaped structure connected to the first converging end 11.

[0089] For example, the S-shaped structure has a curvature, and the inner diameter of the S-shaped structure matches the inner diameter of the blood vessel.

[0090] This can break up blood clots attached to the inner wall of blood vessels.

[0091] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this disclosure. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0092] Although embodiments of this disclosure have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this disclosure, the scope of which is defined by the claims and their equivalents.

Claims

1. A thrombus removal device, characterized in that, include: The filter plug includes a filter body and a first converging end, the first converging end being used to bind one end of the filter body. The plug fragmentation section, the distal end of which is connected to the first converging end, is configured to rotate relative to the plug section; A ball socket is provided at one of the first converging end and the distal end of the broken plug, and a ball head is provided at the other end that matches the ball socket. The filter plug and the broken plug are connected through the ball socket and the ball head. A first magnetic element is provided on the inner wall of the ball socket, and the ball head is a second magnetic element, so that the ball head can rotate within the first magnetic element while forming a magnetic connection with the ball socket.

2. The thrombus removal device according to claim 1, characterized in that, The distal end of the fragmented plug is magnetically connected to the first converging end.

3. The thrombus removal device according to claim 2, characterized in that, A first magnetic element is provided at the distal end of the broken plug portion, and a second magnetic element is provided at the end where the first converging end is connected to the distal end of the broken plug portion. The first magnetic element and the second magnetic element are magnetically connected.

4. The thrombus removal device according to claim 2, characterized in that, The first converging end includes a ball-shaped cavity and a side wall portion surrounding the ball-shaped cavity. The ball-shaped cavity and the side wall portion form a cavity with an open end, and the ball head is located in the cavity.

5. The thrombus removal device according to claim 4, characterized in that, The end of the sidewall is bent inward to form a concave opening, which forms a limiting fit with the ball head.

6. The thrombus removal device according to claim 2, characterized in that, The first magnetic element and the second magnetic element are magnetically connected; wherein... The first magnetic element is disposed on the inner surface of the ball socket; or, A groove is formed on the inner wall of the ball-shaped cavity, and the first magnetic element is disposed within the groove; wherein... The height of the first magnetic element is less than the depth of the groove.

7. The thrombus removal device according to claim 1, characterized in that, The filter plug is configured to expand radially along the blood vessel; wherein, The filter body includes: Multiple first filter units; and Multiple second filter units; With the filter plug expanded, a plurality of first filter units are arranged circumferentially along the filter plug to form a first filter section, and a plurality of second filter units are arranged circumferentially along the filter plug to form a second filter section. The first filter section and the second filter section are arranged opposite each other along the axial direction of the filter plug. Both the first and second filter units are provided with mesh holes, and the size of the mesh holes in the first filter unit is larger than the size of the mesh holes in the second filter unit.

8. The thrombus removal device according to claim 7, characterized in that, The filter body includes multiple beams, which are spaced apart circumferentially along the filter plug portion. The end of the first filter portion is connected to one end of the multiple beams, and the second filter portion is connected to the other end of the multiple beams. A barb structure is provided on the outer wall of the beams. When the plug is inflated, a portion of the beam can contact the inner surface of the blood vessel sidewall, and the barb structure is configured to penetrate the sidewall of the blood vessel.

9. The thrombus removal device according to claim 1, characterized in that, The fragmented part is configured to expand radially, and the fragmented part has an S-shaped structure in the expanded state, with the distal end of the S-shaped structure connected to the first converging end.

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