Plug assembly

Abstract

The embodiment of the present disclosure discloses a plug removing assembly, which comprises a filter plug part and a broken plug part connected with the filter plug part, the filter plug part comprises a filter body and a first converging end for binding one end of the filter body, the broken plug part comprises a broken plug body and a rotating shaft connected with a distal end of the broken plug body, and the broken plug body can rotate relative to the filter plug part; the first converging end comprises a hollow part, the first converging end comprises at least one open end, the open end is in communication with the outside world, and at least a part of the rotating shaft is located in the hollow part.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of medical devices, in particular, to a thrombus removing assembly. BACKGROUND

[0002] Mechanical thrombectomy is a technical method for restoring blood flow in blood vessels by puncturing an artery, passing a thrombectomy device through the blood vessel to the occluded position of the blood vessel, and then passing the thrombus through the thrombectomy device or thrombectomy catheter to remove the thrombus.

[0003] The current mechanical thrombectomy mainly uses a thrombus breaker to break the thrombus first, and then uses a thrombus removing device to remove the broken thrombus. The proximal end of the thrombus breaker is connected with a driving device to drive the thrombus breaker to rotate, and the distal end of the thrombus breaker is a free end.

[0004] However, during the operation of the thrombus breaker, the distal end of the thrombus breaker is prone to swing and deviate from the central axis of the thrombus breaker, and the distal end of the thrombus breaker is prone to damage the outer wall of the blood vessel. SUMMARY

[0005] An object of the present disclosure is to provide a new technical solution for a thrombus removing assembly.

[0006] In one embodiment of the present disclosure, a thrombus removing assembly is provided, which comprises a thrombus filtering part and a thrombus breaking part connected with the thrombus filtering part, the thrombus breaking part being capable of rotating relative to the thrombus filtering part; the thrombus filtering part comprises a filtering body and a first converging end for converging one end of the filtering body; the thrombus breaking part comprises a thrombus breaking body and a rotating shaft connected with the distal end of the thrombus breaking body; the first converging end comprises a hollow part and an open end, and at least a part of the rotating shaft is located in the hollow part.

[0007] Optionally, a limiting assembly is arranged in the hollow part, the limiting assembly being located near the open end, the limiting assembly being in clearance fit with the side surface of the rotating shaft, a cap part being arranged at the end of the rotating shaft away from the thrombus breaking body, the cap part being located on the side of the limiting assembly away from the thrombus breaking body and being in limiting fit with the limiting assembly.

[0008] Optionally, the limiting assembly is arranged along the circumference of the inner wall of the first converging end, and the ratio of the length of the limiting assembly along the axial direction of the first converging end to the length of the rotating shaft along the axial direction of the rotating shaft is greater than or equal to 1:2; wherein the limiting assembly is a limiting protrusion arranged at intervals, or the limiting assembly is a limiting ring.

[0009] Optionally, the end of the rotating shaft connected to the bolt body has a necking structure, and a pressure cap is provided at the end of the bolt body connected to the rotating shaft. One end of the pressure cap has an opening, and a portion of the rotating shaft extends out from the opening.

[0010] Optionally, the end of the rotating shaft connected to the puncture body is spaced apart from the open end.

[0011] Optionally, a first magnetic element is provided at the end of the rotating shaft connected to the bolt body, and a second magnetic element is provided at the open end, wherein the first magnetic element and the second magnetic element can repel each other.

[0012] Optionally, the pressure cap is a first magnetic element, and the limiting component is a second magnetic element, wherein the first magnetic element and the second magnetic element can repel each other.

[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 area of ​​the mesh of the first filter unit is larger than the area 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 A magnified view of a portion of B in the image.

[0021] Explanation of reference numerals in the attached figures:

[0022] 10. Filter plug; 11. First gathering end; 12. Rotating shaft; 13. Limiting assembly; 14. Pressure cap; 15. First magnetic element; 16. Second magnetic element; 17. Cap;

[0023] 20. Fragmented thrombus;

[0024] 32. First filter unit; 33. Second filter unit; 34. First filter section; 35. Beam; 36. Second filter section; 37. Mesh; 38. Barb. Detailed Implementation

[0025] 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.

[0026] 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.

[0027] 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 do not indicate or imply that the components or elements 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.

[0028] 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.

[0029] According to one embodiment of this disclosure, a thrombus removal assembly is provided. For example... Figure 1 As shown, the plug removal assembly includes a plug filter section 10 and a plug breaker section 20 connected to the plug filter section 10. The plug breaker body is rotatable relative to the plug filter section 10. The plug filter section 10 includes a filter body and a first converging end 11, which is used to bind one end of the filter body. The plug breaker section 20 includes a plug breaker body and a rotating shaft 12, which is connected to the distal end of the plug breaker body. The first converging end 11 includes a hollow portion and an open end, and at least a portion of the rotating shaft 12 is located within the hollow portion.

[0030] The thrombus fragmentation section 20 is a component used to break up blood clots.

[0031] 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.

[0032] The filter plug portion 10 is used to filter the thrombus fragmented by the fragmentation plug portion 20. The first constriction end 11 is used to bind the end of the filter plug body.

[0033] The distal end of the fragmented part 20 refers to the end of the fragmented part 20 that is farther away from the operator.

[0034] For example, both the plug fragment 20 and the filter plug 10 are elastic. Under the action of an external force, the filter plug 10 and the plug fragment 20 can deform. When the external force is removed, the filter plug 10 and the plug fragment 20 can return to their predetermined shape.

[0035] For example, the break plug portion 20 and the filter plug portion 10 are made of shape memory alloys, such as nickel-titanium alloys.

[0036] In actual use, the thrombectomy device is first housed 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 the catheter is pulled open distal to the thrombus to release the thrombectomy device. 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.

[0037] 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.

[0038] Specifically, the distal end of the plug body is connected to the rotating shaft 12, and the end of the rotating shaft 12 away from the plug body enters the hollow part from the open end. When the plug body rotates, the rotating shaft 12 can rotate relative to the plug section 10 within the hollow part.

[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 of the fragmented thrombus 20 when it rotates without support, thereby avoiding damage to the inner wall of the blood vessel by the distal end of the fragmented thrombus 20.

[0040] Furthermore, by connecting the distal end of the break-up section 20 to the fixed filter section 10, the filter section 10 can provide 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 in one go, which improves the thrombus fragmentation efficiency and reduces the number of traumas.

[0042] In one example, such as Figure 2 As shown, a limiting component 13 is provided within the hollow portion. The limiting component 13 is located near the opening end. The limiting component 13 forms a clearance fit with the side surface of the rotating shaft 12. A cap 17 is provided at the end of the rotating shaft 12 on the side away from the briquette body. The cap 17 is located on the side of the limiting component 13 away from the briquette body and forms a limiting fit with the limiting component 13.

[0043] For example, the limiting component 13 forms a limiting engagement with the cap 17 of the rotating shaft 12. The cap 17 at the end of the rotating shaft 12 is connected to the rotating shaft 12, and the rotating shaft 12 is located at the middle of the length direction of the cap 17. The rotating shaft 12 is perpendicular to the cap 17.

[0044] For example, the limiting component 13 is arranged circumferentially along the inner wall of the hollow portion. A gap is formed between the side wall of the limiting component 13 and the side wall of the rotating shaft 12 to avoid frictional resistance to the side wall of the rotating shaft 12 during rotation.

[0045] In this way, the rotating shaft 12 can be prevented from coming out of the first converging end 11.

[0046] In one example, such as Figure 2As shown, the limiting component 13 is arranged circumferentially along the inner wall of the first converging end 11. The ratio of the length of the limiting component 13 along the axial direction of the first converging end 11 to the length of the rotating shaft 12 along the axial direction of the rotating shaft 12 is ≥1:2. The limiting component 13 is a limiting protrusion arranged at intervals, or the limiting component 13 is a limiting ring.

[0047] During use, the limiting ring or limiting protrusion is spaced apart from the side wall of the rotating shaft 12. The rotating shaft 12 is prone to wobbling during rotation. When the rotating shaft 12 wobbles, the side wall of the rotating shaft 12 contacts the surface of the limiting component 13. The limiting component 13 prevents the rotating shaft 12 from wobbling further and limits the wobbling angle of the rotating shaft 12.

[0048] For example, when the limiting component 13 consists of multiple limiting protrusions, the multiple limiting protrusions are spaced apart. The limiting protrusions extend axially along the hollow portion, and the ratio of the length of the limiting protrusion to the axial length of the rotating shaft 12 is greater than or equal to 1:2.

[0049] Optionally, the limiting component 13 is a limiting ring, and the ratio of the length of the limiting ring to the axial length of the rotating shaft 12 is greater than or equal to 1:2.

[0050] In this way, the contact area between the limiting component 13 and the side wall of the rotating shaft 12 is increased. Thus, when the limiting component 13 stops the swing of the rotating shaft 12, the force-bearing area of ​​the rotating shaft 12 is increased, thereby avoiding the occurrence of local deformation of the rotating shaft 12 caused by contact between the rotating shaft 12 and the limiting component 13.

[0051] In one example, such as Figure 2 As shown, the end of the rotating shaft 12 connected to the bolt body has a necking structure. A pressure cap 14 is provided at the end where the bolt body is connected to the rotating shaft 12, and an opening is provided at one end of the pressure cap 14, from which a portion of the rotating shaft 12 protrudes.

[0052] Specifically, a necking structure is provided at the end of the rotating shaft 12 that connects to the puncture body. The inner diameter of the part of the rotating shaft 12 that connects to the puncture body is R1, and the inner diameter of the rest of the rotating shaft 12 is R2, where R1 is greater than the length of R2.

[0053] In this way, the movement of the first gathering end 11 is restricted by the necking structure, thus preventing the first gathering end 11 from contacting the fragment body.

[0054] The cap 14 covers the distal end of the thrombus removal body. The inner diameter of the cap 14 is the same as the length of R1. The size of the opening is the same as the length of R2. R2 can extend from the opening and enter the hollow part. The cap 14, the thrombus removal body, and the rotating shaft 12 are fixedly connected, and when the thrombus removal body rotates, the rotating shaft 12 can rotate together.

[0055] In this way, the pressure cap 14 avoids the situation where the end of the rotating shaft 12 collides with the end of the first converging end 11 during the use of the throttle removal device, which would cause the end of the rotating shaft 12 to deform.

[0056] In one example, the end of the rotating shaft 12 connected to the puncture body is spaced apart from the open end.

[0057] like Figure 2 As shown, the end of the rotating shaft 12 connected to the bolt body and the open end are at a set distance h1, and the distance between the first limiting part and the bottom wall of the hollow part is h2. h1 ≥ h2. When the bolt body 20 rotates, the rotating shaft 12 will be displaced within the hollow part along the axial direction of the hollow part. By spaced between the bolt body and the open end, a margin is provided for the axial displacement of the rotating shaft 12 during rotation.

[0058] In this way, the frictional force received by the side wall of the rotating shaft 12 is effectively reduced.

[0059] For example, the rotating shaft 12 is configured to reciprocate along the axial direction of the first converging end 11 within the hollow portion.

[0060] In this way, the rotating shaft 12 can reciprocate along the axial direction of the hollow part during rotation, increasing the adaptability of the rotating shaft 12.

[0061] In addition, this method provides a compensation space for the axial movement of the rotating shaft 12 along the hollow part, enabling the rotating shaft 12 to move along the axial direction of the hollow part and preventing the rotating shaft 12 from jamming.

[0062] In one example, a first magnetic element 15 is provided at the end of the rotating shaft 12 that connects to the bolt body. A second magnetic element 16 is provided at the open end. The first magnetic element 15 and the second magnetic element 16 can repel each other.

[0063] Specifically, the side of the first magnetic element 15 closest to the second magnetic element 16 has the opposite magnetism to the side of the second magnetic element 16 closest to the first magnetic element 15.

[0064] During the rotation of shaft 12, the broken bolt body is prone to collision with the open end. Repeated collisions can easily damage the broken bolt body.

[0065] In this way, the repulsion between the first magnetic element 15 and the second magnetic element 16 creates a repulsive force between the broken plug body and the open end. This prevents the broken plug body from colliding with the open end during the use of the plug removal assembly.

[0066] For example, the pressure cap 14 is a first magnetic element 15, and the limiting component 13 is a second magnetic element 16. The first magnetic element 15 and the second magnetic element 16 can repel each other.

[0067] In this way, the weight of the thrombectomy device is effectively reduced.

[0068] Optionally, the rotating shaft 12 is provided with a third magnetic element, the side of the third magnetic element near the second magnetic element 16 having the same magnetism as the side of the second magnetic element 16 near the third magnetic element. A repulsive force is formed between the rotating shaft 12 and the limiting assembly 13.

[0069] For example, a third magnetic element is provided around the outer wall of the rotating shaft 12. Optionally, the rotating shaft 12 itself is the third magnetic element.

[0070] In this way, while the end of the limiting component 13 and the cap 17 form a limiting position, the rotating shaft 12 is located in the middle of the limiting component 13, which can prevent the rotating shaft 12 from rubbing against the side wall of the limiting component 13.

[0071] 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.

[0072] For example, when the filter plug portion 10 is 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. 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. A plurality of beams 35 are provided between the first filter portion 34 and the second filter portion 36. The plurality of beams 35 are spaced apart circumferentially along the filter plug portion 10.

[0073] For example, both the first filter unit 32 and the second filter unit 33 are provided with mesh 37. 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. When the filter plug portion 10 is in the expanded state, the first filter portion 34 is located on the side closer to the distal end of the broken plug portion 20, and the second filter portion 36 is located on the side farther away from the distal end of the broken plug portion 20.

[0074] For example, in the expanded state of the filter plug portion 10, 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 sequentially in the expanded state to form a mesh structure for the first filter portion 34. Multiple second filter units 33 are connected sequentially in the expanded state to form a mesh structure for the second filter portion 36.

[0075] 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.

[0076] 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 arrows indicate the direction of blood flow. The proximal end of the thrombus fragmentation section 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, they 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.

[0077] 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.

[0078] 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.

[0079] 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.

[0080] 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.

[0081] 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.

[0082] This allows the second filtration section 36 to collect the broken-up blood clots more effectively.

[0083] 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.

[0084] 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.

[0085] 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.

[0086] 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.

[0087] This can break up blood clots attached to the inner wall of blood vessels.

[0088] 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.

[0089] 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 deobstructive assembly, characterized in that, The application relates to a filter plug and a broken plug connected with the filter plug, wherein the broken plug comprises a broken plug body and a rotating shaft, the broken plug body can rotate relative to the filter plug, the filter plug comprises a filter body and a first converging end for binding one end of the filter body; the rotating shaft is connected with the distal end of the broken plug body, the first converging end comprises a hollow part and an open end, and at least a part of the rotating shaft is located in the hollow part; a limiting assembly is arranged in the hollow part, the limiting assembly and the side surface of the rotating shaft form a gap fit; a gland is arranged at the end of the broken plug body connected with the rotating shaft, one end of the gland is provided with a mouth, and a part of the rotating shaft extends out of the mouth; the gland is a first magnetic element, the limiting assembly is a second magnetic element, the rotating shaft is a third magnetic element, the first magnetic element and the second magnetic element can repel each other, and the side of the third magnetic element close to the second magnetic element is of the same magnetism as the side of the second magnetic element close to the third magnetic element. The limiting assembly is located close to the open end, a cap is arranged at the end of the rotating shaft away from the broken plug body, and the cap is located at the side of the limiting assembly away from the broken plug body and forms a limiting fit with the limiting assembly. The limiting assembly is arranged along the circumference of the inner wall of the first converging end, the ratio of the length of the limiting assembly along the axial direction of the first converging end to the length of the rotating shaft along the axial direction of the rotating shaft is greater than or equal to 1:2; wherein, The limiting assembly is a limiting protrusion arranged at intervals, or the limiting assembly is a limiting ring. The end of the rotating shaft connected with the broken plug body is provided with a necked structure.

2. The debonding assembly of claim 1, wherein, The end of the rotating shaft connected with the broken plug body is arranged at intervals from the open end.

3. The debonding assembly of claim 2, wherein, A first magnetic element is arranged at the end of the rotating shaft connected with the broken plug body, and a second magnetic element is arranged at the open end, the first magnetic element and the second magnetic element can repel each other. The filter plug is configured to be radially expanded along a blood vessel; wherein, 4. The debonding assembly of claim 2, wherein, The filter body comprises:

5. The debonding assembly of claim 1, wherein, a plurality of first filter units; and 6. The debonding assembly of claim 1, wherein, a plurality of second filter units; 7. The debonding assembly of claim 1, wherein, In the expanded state of the filter plug, a plurality of the first filter units are arranged along the circumference of the filter plug to form a first filter part, and a plurality of the second filter units are arranged along the circumference of the filter plug to form a second filter part, the first filter part and the second filter part are arranged opposite along the axial direction of the filter plug; wherein, The first filter unit and the second filter unit are both provided with meshes, the area of the meshes of the first filter unit is greater than the area of the meshes of the second filter unit. The filter body comprises a plurality of beams, the plurality of beams are arranged at intervals along the circumference of the filter plug, one end of the first filter part is connected with one end of the plurality of beams, and the second filter part is connected with the other end of the plurality of beams; a barb structure is arranged on the outer wall of the beam; In the expanded state of the filter plug, a part of the beam can be in contact with the inner surface of the side wall of the blood vessel, and the barb structure is configured to be capable of penetrating into the side wall of the blood vessel. ​ ​ 8. The debonding assembly of claim 7, wherein, ​ ​ 9. The debonding assembly of claim 1, wherein, The broken plug part is configured to expand in a radial direction, and in the expanded state, the broken plug part is in an S-shaped structure, and a distal end of the S-shaped structure is connected with the first converging end.

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