Thrombectomy device and thrombectomy system

Abstract

The thrombectomy device comprises a thrombectomy sheathing canal, a traction wire and a cutting support, the thrombectomy sheathing canal is provided with an adjusting channel, the adjusting channel extends in the axial direction of the thrombectomy sheathing canal, the far end of the adjusting channel penetrates through the peripheral face of the thrombectomy sheathing canal, the traction wire is movably arranged in the adjusting channel, and the cutting support is arranged on the thrombectomy sheathing canal. The cutting support is arranged on the peripheral face of the thrombectomy sheathing canal, the far end of the cutting support is connected with the peripheral face of the thrombectomy sheathing canal, the far end of the traction wire penetrates through the adjusting channel and then is connected with the near end of the cutting support, and the traction wire can move in the axial direction of the thrombectomy sheathing canal and pull the cutting support. And the cutting bracket is opened and closed along the radial direction of the thrombus extraction sheathing canal under the traction adjustment of the traction wire. According to the thrombus extraction device, in the cutting process, the traction wire can be used for pulling the cutting support to enable the cutting support to be opened and closed in the radial direction, and therefore the posture of the cutting support can be adjusted according to thrombus, and thrombus plaques can be cut more smoothly and efficiently.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and in particular to a thrombectomy device and a thrombectomy system. Background Art

[0002] A thrombus is a small piece formed on the surface of the exfoliation or repair site of the blood vessel inner wall in the cardiovascular system. The formation of thrombus plaques in human blood vessels will cause serious human diseases and even endanger life, such as myocardial infarction, cerebral infarction, limb infarction, etc.

[0003] The endovascular interventional technology has the advantages of less trauma and quick recovery when applied to thrombus removal. The existing thrombus aspiration device intervenes in the human blood vessel with a thrombus aspiration catheter and uses negative pressure to aspirate the thrombus that forms an obstruction in the human blood vessel. However, the larger thrombus formed on the blood vessel inner wall has strong adhesion, and it is difficult to remove the thrombus plaque only by the negative pressure aspiration method, and the removal effect is not ideal. Summary of the Invention

[0004] The technical problem to be solved by the present invention is that the larger thrombus has strong adhesion and it is difficult to remove it only by the negative pressure aspiration method. In view of the defects of the prior art, a thrombectomy device and a thrombectomy system are provided.

[0005] The present invention solves its technical problem through the following technical solutions:

[0006] According to the first aspect of the present invention, a thrombectomy device is provided. The thrombectomy device includes a thrombectomy sheath, a traction wire, and a cutting stent. The thrombectomy sheath is provided with an adjustment channel, the adjustment channel extends along the axial direction of the thrombectomy sheath, the distal end of the adjustment channel penetrates the outer peripheral surface of the thrombectomy sheath, the traction wire is movably arranged in the adjustment channel, the cutting stent is arranged on the outer peripheral surface of the thrombectomy sheath, the distal end of the cutting stent is connected to the outer peripheral surface of the thrombectomy sheath, the distal end of the traction wire passes through the adjustment channel and is connected to the proximal end of the cutting stent, and the traction wire can move along the axial direction of the thrombectomy sheath and pull the cutting stent, so that the cutting stent opens and closes along the radial direction of the thrombectomy sheath under the traction adjustment of the traction wire.

[0007] In some embodiments of the present invention, the thrombectomy sheath is provided with a plurality of the adjustment channels, and each adjustment channel is respectively provided with a traction wire;

[0008] The cutting stent includes a plurality of cutting branches extending along the axial direction of the thrombectomy sheath. The distal ends of the cutting branches are connected to the distal side of the thrombectomy sheath, and the distal end of each traction wire is connected to the proximal end of at least one cutting branch.

[0009] In some embodiments of the present invention, the plurality of adjustment channels are sequentially arranged at intervals along the circumferential direction of the thrombectomy sheath tube, the plurality of cutting branches are sequentially arranged at intervals along the circumferential direction of the thrombectomy sheath tube, each of the cutting branches is independent of each other, and the distal end of each traction wire is respectively connected to the proximal end of one of the cutting branches.

[0010] In some embodiments of the present invention, along the distal end to the proximal end of the thrombectomy sheath tube, the cutting branch includes a first connecting section, a cutting section and a second connecting section connected in sequence, the distal end of the first connecting section is connected to the thrombectomy sheath tube, and the proximal end of the second connecting section is connected to the traction wire;

[0011] Wherein, at least a part of the segments of the cutting section are bent and protruded along the radial direction of the thrombectomy sheath tube and towards the direction away from the thrombectomy sheath tube.

[0012] In some embodiments of the present invention, the first connecting section is connected to the thrombectomy sheath tube through a connecting end head, the connecting end head is movably connected to the thrombectomy sheath tube, and the traction wire can rotate to adjust the orientation of the bent protrusion of the cutting section; when the cutting section is bent and protruded towards the direction close to the thrombectomy sheath tube, the movement of the traction wire along the axial direction of the thrombectomy sheath tube towards the proximal end can drive the cutting section to squeeze the outer wall of the thrombectomy sheath tube, so that the inner diameter of the position where the thrombectomy sheath tube is squeezed is reduced.

[0013] In some embodiments of the present invention, along the distal end to the proximal end of the thrombectomy sheath tube, the cutting branch includes a first cutting section, a clamping section and a second cutting section connected in sequence, the distal end of the first cutting section is connected to the thrombectomy sheath tube, the proximal end of the second cutting section is connected to the traction wire, at least a part of the segments of the first cutting section and at least a part of the segments of the second cutting section respectively extend along the direction away from the thrombectomy sheath tube, and at least a part of the segments of the clamping section are bent and protruded along the radial direction of the thrombectomy sheath tube and towards the direction close to the thrombectomy sheath tube.

[0014] In some embodiments of the present invention, the radial supporting force of the clamping section is greater than the larger radial supporting force of the radial supporting forces of the first cutting section and the second cutting section.

[0015] In some embodiments of the present invention, the thrombectomy sheath tube includes an inner membrane tube and a support tube sleeved outside the inner membrane tube, the roughness of the inner membrane tube is less than the roughness of the support tube; the thrombectomy sheath tube further includes an elastic tube, the elastic tube is sleeved between the inner membrane tube and the support tube, and the elastic performance of the elastic tube is greater than the elastic performances of the inner membrane tube and the support tube.

[0016] In some embodiments of the present invention, the thrombus extraction sheath tube is provided with at least one thrombus extraction hole communicating with the inner cavity of the thrombus extraction sheath tube. Along the axial direction of the thrombus extraction sheath tube, the thrombus extraction hole is located between the proximal end and the distal end of the cutting stent.

[0017] In some embodiments of the present invention, the thrombus extraction device further includes a film covering. The film covering is disposed on the distal side of the cutting stent, the proximal side of the cutting stent is disposed outside the film covering, and an opening communicating with the thrombus extraction hole is defined between the proximal side of the film covering and the outer peripheral surface of the thrombus extraction sheath tube.

[0018] According to a second aspect of the present invention, there is provided a thrombus extraction system, which includes the thrombus extraction device according to any one of the technical solutions in the first aspect.

[0019] According to the thrombus extraction device provided by the present invention, when there is a large thrombus plaque inside a blood vessel, the thrombus extraction sheath tube can be driven to axially move together with the cutting stent disposed outside the thrombus extraction sheath tube, so as to use the cutting stent to divide the large thrombus plaque into multiple small plaques, which is convenient for further removing the small plaques by means of negative pressure aspiration. It should also be noted that during the cutting process, the cutting stent can be pulled by a traction wire and opened and closed in the radial direction, so that the posture of the cutting stent can be adjusted according to the thrombus, which is convenient for cutting the thrombus plaque more smoothly and efficiently. Among them, the cutting stent opening and closing in the radial direction of the thrombus extraction sheath tube means that the cutting stent expands or closes in the radial direction of the thrombus extraction sheath tube. For example, before the cutting stent reaches the position of the thrombus plaque, the cutting stent is pulled by a traction wire to make it closed, so that the cutting stent has a smaller outer diameter size, which is beneficial for the cutting stent and the thrombus extraction sheath tube to axially move in the blood vessel and smoothly move to the position of the thrombus plaque. When the cutting stent penetrates through the thrombus plaque in a closed posture, the traction wire can be controlled to be loosened, and the pulling force of the traction wire on the cutting stent is reduced, and then the cutting stent radially expands under the action of its own elastic force, so as to cut the thrombus plaque. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention will be further described below in conjunction with the drawings and embodiments. In the drawings:

[0021] Figure 1 is a partial cross-sectional structural schematic diagram of an exemplary thrombus extraction device of the present invention;

[0022] Figure 2 is a partial cross-sectional structural schematic diagram of the thrombus extraction device in Embodiment 1 of the present invention;

[0023] Figure 3 is a partial cross-sectional structural schematic diagram of the thrombus extraction device in the bent state in Embodiment 1 of the present invention;

[0024] Figure 4 is a partial structural schematic diagram of the thrombus extraction device in Embodiment 1 of the present invention;

[0025] Figure 5 This is a partial cross-sectional structural schematic diagram of the thrombectomy device in Embodiment 2 of the present invention;

[0026] Figure 6 This is a partial cross-sectional structural schematic diagram of the thrombectomy device in Embodiment 3 of the present invention;

[0027] Figure 7 This is a partial cross-sectional structural schematic diagram of the thrombectomy device in the state where the cutting stent locks the thrombus extraction sheath tube in Embodiment 3 of the present invention;

[0028] Figure 8 This is a partial cross-sectional structural schematic diagram of the thrombectomy device in Embodiment 4 of the present invention;

[0029] Figure 9 This is a partial cross-sectional structural schematic diagram of the thrombectomy device in the state where the cutting stent locks the thrombus extraction sheath tube in Embodiment 4 of the present invention.

[0030] The marks in the drawings are represented as follows:

[0031] 100, thrombectomy device; 1001, open end; 10, thrombus extraction sheath tube; 11, inner membrane tube; 12, support tube; 13, elastic tube; 101, inner cavity; 102, adjustment channel; 103, thrombus extraction hole; 20, cutting stent; 21, cutting branch; 2111, first connection section; 2112, cutting section; 21121, connection part; 21122, cutting part; 2113, second connection section; 2121, first cutting section; 21211, first cutting sub-section; 21212, second cutting sub-section; 2122, clamping section; 21221, first clamping sub-section; 21222, second clamping sub-section; 21223, third clamping sub-section; 2123, second cutting section; 21231, third cutting sub-section; 21232, fourth cutting sub-section; 30, traction wire; 40, film; 50, imaging ring; 60, connection end; 61, connection cavity. Detailed Description of the Invention

[0032] For a clearer understanding of the technical features, objectives, and effects of the present invention, the specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0033] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided so that the present disclosure can be more thoroughly understood and the scope of the present disclosure can be fully conveyed to those skilled in the art.

[0034] It should be understood that the terms used herein are for the purpose of describing particular example embodiments only and are not intended to be limiting. Unless the context clearly dictates otherwise, the singular forms "a", "an", and "the" as used herein may also include the plural forms. The terms "comprising", "including", "containing", and "having" are inclusive and thus specify the presence of the stated features, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring them to be performed in the particular order described or illustrated, unless the order of performance is explicitly stated. It should also be understood that additional or alternative steps may be used.

[0035] Although the terms first, second, third, etc. may be used herein to describe multiple elements, components, regions, layers, and / or sections, these elements, components, regions, layers, and / or sections should not be limited by these terms. These terms may be used only to distinguish one element, component, region, layer, or section from another. Unless the context clearly indicates otherwise, terms such as "first", "second", and other numerical terms when used herein do not imply an order or sequence. Thus, the first element, component, region, layer, or section discussed below may be referred to as the second element, component, region, layer, or section without departing from the teachings of the example embodiments.

[0036] For ease of description, spatial relative relationship terms may be used herein to describe the relationship of one element or feature shown in the figures to another element or feature, such relative relationship terms such as "inside", "outside", "inner side", "outer side", "below", "beneath", "above", "over" and the like. Such spatial relative relationship terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is flipped, an element described as "below" or "beneath" another element or feature will then be oriented "above" or "over" the other element or feature. Thus, the example term "below" can include both an orientation above and below. The device may be otherwise oriented (rotated 90 degrees or in other directions) and the spatial relative relationship descriptors used herein are to be interpreted accordingly.

[0037] It should be noted that the terms "distal end" and "proximal end" are commonly used terms in the field of interventional medical devices. The "distal end" refers to the end away from the operator during the surgical procedure, and the "proximal end" refers to the end close to the operator during the surgical procedure. The axial direction refers to the direction parallel to the line connecting the centers of the distal end and the proximal end of the medical device; the radial direction refers to the direction perpendicular to the above-mentioned axial direction.

[0038] As Figure 1 shown, the present invention provides a thrombectomy device 100, which includes a thrombectomy sheath 10, a traction wire 30, and a cutting stent 20.

[0039] Specifically, the thrombectomy sheath 10 has a hollow tubular structure and has a lumen 101 that penetrates its proximal end and distal end. The proximal end of the thrombectomy sheath 10 can be connected to an external negative pressure device, and the negative pressure device is used to generate negative pressure in the lumen 101 of the thrombectomy sheath 10 to aspirate thrombus plaques in the blood vessel. An adjustment channel 102 extending along the axial direction of the thrombectomy sheath 10 is further provided in the wall of the thrombectomy sheath 10. The proximal end of the adjustment channel 102 forms an opening at the proximal end of the thrombectomy sheath 10, and the distal end of the adjustment channel 102 forms an opening on the outer peripheral surface of the thrombectomy sheath 10.

[0040] The traction wire 30 is movably disposed in the adjustment channel 102, so that the traction wire 30 can move relative to the thrombectomy sheath 10 along the axial direction of the thrombectomy sheath 10 in the adjustment channel 102. The proximal end of the traction wire 30 can be exposed outside the thrombectomy sheath 10 through the proximal end of the thrombectomy sheath 10, and the distal end of the traction wire 30 can be exposed outside the thrombectomy sheath 10 through the opening on the outer peripheral surface of the thrombectomy sheath 10.

[0041] The cutting stent 20 is disposed on the outer peripheral surface of the thrombectomy sheath 10. The distal end of the cutting stent 20 is connected to the outer peripheral surface of the thrombectomy sheath 10. The distal end of the traction wire 30 is connected to the proximal end of the cutting stent 20 through the opening. The traction wire 30 can move along the axial direction of the thrombectomy sheath 10 and pull the cutting stent 20, and the cutting stent 20 can be opened and closed along the radial direction of the thrombectomy sheath 10 under the traction adjustment of the traction wire 30.

[0042] When there is a large thrombus plaque inside the blood vessel, the thrombectomy sheath 10 together with the cutting stent 20 disposed outside the thrombectomy sheath 10 can be driven to axially move relative to the thrombus plaque in the blood vessel, so as to use the cutting stent 20 to divide the large thrombus plaque into multiple small plaques, so as to further remove the small plaques by means of negative pressure aspiration.

[0043] During the cutting process, the traction wire 30 can be used to pull the cutting stent 20 and make it open and close radially, so that the posture of the cutting stent 20 can be adjusted according to the position of the thrombus plaque, facilitating smoother and more efficient cutting of the thrombus plaque. Among them, the radial opening and closing of the cutting stent 20 along the thrombus extraction sheath tube 10 means that the cutting stent 20 expands or closes radially along the thrombus extraction sheath tube 10. For example, before the cutting stent 20 reaches the position of the thrombus plaque, the traction wire 30 is used to pull the cutting stent 20 to make it close, so that the cutting stent 20 has a smaller outer diameter size, which is beneficial for the cutting stent 20 and the thrombus extraction sheath tube 10 to axially move in the blood vessel and smoothly move to the position of the thrombus plaque. When the cutting stent 20 is inserted through the thrombus plaque in a closed posture, the traction wire 30 can be controlled to loosen (i.e., the traction wire 30 moves axially in the distal direction). The pulling force of the cutting stent 20 by the traction wire 30 decreases, and then the cutting stent 20 radially expands under the action of its own elastic force, facilitating the cutting of the thrombus plaque.

[0044] It should also be noted that the cutting angle of the cutting stent 20 can also be adjusted by actively adjusting the expansion or closing state of the cutting stent 20 to cut the same thrombus plaque at multiple angles to further reduce the plaque size after cutting. For example, after a thrombus plaque is cut once, first pull the traction wire 30 to move to the proximal side, so that the cutting stent 20 changes from the expanded state to the closed state, making the cutting stent 20 closely attached to the outer peripheral surface of the thrombus extraction sheath tube 10. Then, control the thrombus extraction sheath tube 10 to connect the cutting stent 20 to rotate a certain angle around the axis of the thrombus extraction sheath tube 10 relative to the blood vessel, and then release the traction wire 30 to make the cutting stent 20 expand again and press against the thrombus plaque. At this time, the relative position of the cutting stent 20 and the thrombus plaque in the circumferential direction of the thrombus extraction sheath tube 10 changes. Finally, drive the thrombus extraction sheath tube 10 and the cutting stent 20 to axially move relative to the thrombus plaque in the blood vessel again to perform secondary cutting on the thrombus plaque at different positions.

[0045] In some embodiments of the present invention, please combine Figure 1 and Figure 2As shown, the thrombus extraction sheath tube 10 is provided with a plurality of adjustment channels 102, and a traction wire 30 is respectively arranged in each adjustment channel 102. The cutting stent 20 includes a plurality of cutting branches 21 extending along the axial direction of the thrombus extraction sheath tube 10. The distal ends of the cutting branches 21 are connected to the outer peripheral surface of the thrombus extraction sheath tube 10, and the distal ends of each traction wire 30 are respectively connected to the proximal ends of at least one cutting branch 21. In this embodiment, the cutting branch 21 is in the shape of a long rod or a silk thread, and the cutting branches 21 in the cutting stent 20 all extend along the axial direction of the thrombus extraction sheath tube 10, so that the extending direction of the cutting branch 21 is the same as its moving direction in the blood vessel, which is beneficial to reducing the resistance of the cutting stent 20 during the movement in the blood vessel during the process of cutting the thrombus plaque, and making the thrombus extraction sheath tube 10 move more smoothly along the axis relative to the blood vessel together with the cutting stent 20. Combining the attached Figure 3 As shown, a plurality of traction wires 30 can respectively control different cutting branches 21, so that the cutting stent 20 can be unfolded or closed locally or all, improving the flexibility of the cutting operation of the cutting stent 20. For example, when the thrombus plaque is biased towards one side of the blood vessel inner wall, only the cutting branches 21 corresponding to the thrombus plaque can be unfolded, and the cutting branches 21 not opposite to the thrombus plaque are kept closed under the traction of the traction wire 30, so that the cutting stent 20 only cuts a part of the thrombus plaque, and minimizes the contact between the cutting stent 20 and the healthy blood vessel inner wall, thereby reducing the damage to the blood vessel inner wall caused by the cutting stent 20.

[0046] In some embodiments, a traction wire 30 can be connected to a cutting branch 21, and the attitude of each cutting branch 21 can be adjusted by using the traction wire 30. In other embodiments, a traction wire 30 can be connected to two or more cutting branches 21, and each traction wire 30 can control the attitudes of two or more cutting branches 21.

[0047] Such as Figure 1 and Figure 2 As shown, a plurality of adjustment channels 102 are arranged at intervals in sequence along the circumferential direction of the thrombus extraction sheath tube 10, a plurality of cutting branches 21 are arranged at intervals in sequence along the circumferential direction of the thrombus extraction sheath tube 10, and the cutting branches 21 are independent of each other. The distal ends of each traction wire 30 are respectively connected to the proximal ends of a cutting branch 21. A plurality of adjustment channels 102 are arranged at intervals in sequence along the circumferential direction of the thrombus extraction sheath tube 10, and the positions of the adjustment channels 102 and the cutting branches 21 can be arranged in one-to-one correspondence. A plurality of cutting branches 21 are arranged at intervals in sequence along the circumferential direction of the thrombus extraction sheath tube 10, so that in the unfolded state of the cutting stent 20, the plurality of cutting branches 21 can cut the thrombus plaque in the blood vessel at a plurality of positions in the circumferential direction, reducing the cutting dead angle of the cutting stent 20 and improving the cutting efficiency of the thrombus plaque.

[0048] It should also be noted that combining the attachedFigure 3 As shown, multiple traction wires 30 can apply tensile forces to each cutting branch 21 independently of each other. During the process of the thrombectomy device 100 intervening in the target position in the blood vessel, when passing through a complex and tortuous blood vessel, the cutting stent 20 can be partially contracted by pulling the traction wires 30 on different sides, making the cutting stent 20 more compliant when passing through, which is beneficial to protecting the inner wall of the blood vessel. Or, when passing through a blood vessel branch or a blood vessel with tortuous lesions, the head end of the thrombectomy sheath 10 can be bent by pulling a single-sided traction wire 30, so that the stent can smoothly pass through the blood vessel branch or effectively fit the lesion site for thrombectomy operation.

[0049] The technical solution of the present invention will be further described in detail below in conjunction with specific embodiments.

[0050] Embodiment 1

[0051] In Embodiment 1, in combination with Figure 2 and Figure 3 as shown, Embodiment 1 of the present invention provides a thrombectomy device 100, which includes a thrombectomy sheath 10, multiple traction wires 30 and a cutting stent 20.

[0052] The thrombectomy sheath 10 has a hollow tubular structure. The thrombectomy sheath 10 includes an inner membrane tube 11 and a support tube 12 sleeved outside the inner membrane tube 11. The roughness of the inner membrane tube 11 is less than that of the support tube 12, making the inner surface of the thrombectomy sheath 10 smoother, so as to facilitate the movement of thrombus plaques more smoothly in the thrombectomy sheath 10, and is beneficial to the smoother sliding of instruments such as guide wires relative to the thrombectomy sheath 10, making the overall delivery process of the thrombectomy device 100 into the target position in the blood vessel smoother. The function of the support tube 12 is to effectively protect the overall structure of the thrombectomy sheath 10 and provide a certain degree of support to facilitate the overall distal push of the thrombectomy device 100.

[0053] In some embodiments, the inner membrane tube 11 can be made of polytetrafluoroethylene (PTFE) material, and the support tube 12 can be made of block polyether amide resin (PEBAX) material.

[0054] Further, a plurality of adjustment channels 102 are provided inside the tube wall of the support tube 12. The adjustment channels 102 extend along the axial direction of the thrombectomy sheath tube 10. The plurality of adjustment channels 102 are arranged at intervals in sequence along the circumferential direction of the thrombectomy sheath tube 10. The proximal end of the adjustment channel 102 forms an opening at the proximal end of the thrombectomy sheath tube 10, and the distal end of the adjustment channel 102 forms an opening on the outer peripheral surface of the thrombectomy sheath tube 10. Specifically, the inner wall of the thrombectomy sheath tube 10 forms the adjustment channel 102 through a PTFE inner membrane tube with a smaller inner diameter. The support tube 12 is integrally formed by a rheological forming process and covers the inner membrane tube 11 and outside the adjustment channel 102 formed by the PTFE inner membrane tube, so that the inner membrane tube 11, the adjustment channel 102 formed by the PTFE inner membrane tube, and the support tube 12 are connected into an integral structure. Among them, the rheological forming process refers to directly forming a semi-solid slurry.

[0055] A traction wire 30 is respectively provided in each adjustment channel 102. The traction wire 30 can move in the adjustment channel 102, that is, the traction wire 30 can move along the axial direction of the thrombectomy sheath tube 10 in the adjustment channel 102 and can also rotate around its own axis.

[0056] The cutting stent 20 includes a plurality of cutting branches 21. The cutting branches 21 are rod-shaped or wire-shaped and extend along the axial direction of the thrombectomy sheath tube 10. The plurality of cutting branches 21 are arranged at intervals in sequence along the circumferential direction of the thrombectomy sheath tube 10. The cutting branches 21 are independent of each other. The distal ends of the cutting branches 21 are connected to the outer peripheral surface of the thrombectomy sheath tube 10. The distal end of each traction wire 30 is respectively connected to the proximal end of a cutting branch 21 through the opening of the adjustment channel 102. When passing through a blood vessel branch or when there is a tortuous lesion in the blood vessel, the head end of the thrombectomy sheath tube 10 can be bent by pulling a single-sided traction wire 30, so that the stent can smoothly pass through the blood vessel branch or effectively fit the lesion site for thrombectomy operation.

[0057] Further, the thrombectomy sheath tube 10 further includes an elastic tube 13. The elastic tube 13 is sleeved between the inner membrane tube 11 and the support tube 12. The elastic performance of the elastic tube 13 is better than that of the inner membrane tube 11 and the support tube 12. The function of the elastic tube 13 is to strengthen the support of the thrombectomy sheath tube 10, so that when the distal end of the thrombectomy sheath tube 10 is bent, the inner cavity 101 of the thrombectomy sheath tube 10 can maintain its shape and ensure the smoothness of the suction channel. Among them, the elastic tube 13 includes but is not limited to a spring tube.

[0058] The elastic tube 13 is provided at the head end of the thrombectomy sheath tube 10. When passing through a blood vessel branch or when there is a tortuous lesion in the blood vessel, after bending the head end of the thrombectomy sheath tube 10 by pulling a single-sided traction wire 30 and making the thrombectomy sheath tube 10 smoothly pass through the blood vessel branch or the tortuous lesion position, after loosening the single-sided traction wire 30, the elastic force of the elastic tube 13 can make the thrombectomy sheath tube 10 automatically return to the state before bending, completing the reset of the head end of the thrombectomy sheath tube 10, which is beneficial to reducing the operation steps in the intervention process of the thrombectomy sheath tube 10 and reducing the operation difficulty.

[0059] In other embodiments, when it is necessary to maintain the bending angle of the thrombus extraction sheath tube 10 after bending adjustment, the elastic tube 13 can also be a corrugated tube. After pulling the unilateral traction wire 30 to bend the head end of the thrombus extraction sheath tube 10 and then releasing the traction wire 30, the head end of the thrombus extraction sheath tube 10 can maintain the bending angle under the action of the corrugated tube, thereby preventing the head end of the thrombus extraction sheath tube 10 from rebounding.

[0060] In this embodiment, the cutting branch 21 is an elastic member. When subjected to the pulling force of the traction wire 30, the cutting branch 21 deforms under the pulling force and adheres to the outer peripheral surface of the thrombus extraction sheath tube 10, causing the cutting stent 20 to be in a closed state as a whole or in part. When the traction wire 30 is released and the pulling force of the traction wire 30 on the cutting member is reduced or the cutting member is no longer subjected to the pulling force of the traction wire 30, the cutting branch 21 recovers its deformation under its own elastic force, and at least a part of the cutting branch 21 is separated from the outer peripheral surface of the thrombus extraction sheath tube 10 in the radial direction, causing the cutting stent 20 to expand radially as a whole and be in an unfolded state.

[0061] During the process of thrombus cutting, when encountering a relatively large thrombus, first tighten the cutting stent 20 to a contracted state, then scrape the thrombus extraction sheath tube 10 from the proximal end of the thrombus to the distal end of the thrombus, then release the traction wire 30 to make the cutting stent 20 be in an unfolded state as a whole, and pull the cutting stent 20 to move axially from the distal end of the thrombus to the proximal end side so that the cutting stent 20 moves relative to the thrombus until the thrombus is located inside the cutting stent 20. Then, pull the contralateral core wire again to control the contraction of the contralateral cutting branch 21 to crush the thrombus, which is beneficial for aspiration thrombus extraction.

[0062] When encountering an adherent thrombus in a narrow area, the traction wire 30 can also be pushed to move to the distal side, causing the cutting branch 21 to expand and thus expanding the cutting stent 20, so as to locally expand the narrow area and perform thrombus cutting and aspiration.

[0063] In addition, when encountering a relatively hard thrombus or plaque that is difficult to cross, the adjustment channel 102 can also inject a liquid medicine from the proximal side and spray the liquid medicine at the opening on the distal side of the adjustment channel 102, so that the liquid medicine diffuses into the blood vessels in the area near the cutting stent 20 to achieve the purpose of dissolving the hard thrombus or plaque.

[0064] As Figure 3 and Figure 4 shown, the thrombus extraction sheath tube 10 is provided with at least one thrombus extraction hole 103 communicating with the inner cavity 101 of the thrombus extraction sheath tube 10. Along the axial direction of the thrombus extraction sheath tube 10, the thrombus extraction hole 103 is located between the proximal end and the distal end of the cutting stent 20. Specifically, the thrombus extraction hole 103 can be set in a circular hole shape or a through hole in a long groove shape extending along the circumferential direction of the thrombus extraction sheath tube 10. One thrombus extraction hole 103 or multiple thrombus extraction holes 103 can be provided on the thrombus extraction sheath tube 10.

[0065] In this embodiment, by providing the thrombus extraction hole 103, the radially expandable and contractible characteristic of the thrombus extraction stent can be utilized. During the process of the cutting stent 20 cutting the plaque, the closed stent can drive the thrombus plaque to move radially along the thrombus extraction sheath 10 towards the side close to the thrombus extraction hole 103. When the thrombus plaque moves near the thrombus extraction hole 103, the thrombus plaque in the blood vessel is aspirated by the negative pressure device at the proximal end of the thrombus extraction sheath 10, or the thrombus extraction sheath 10 is retracted to achieve the purpose of thrombus extraction.

[0066] As Figure 1 、 Figure 2 and Figure 5 shown, the thrombus extraction device further includes a developing ring 50. The developing ring 50 is sleeved outside the inner membrane tube 11 and connected to the distal end of the elastic tube 13. Among them, the developing ring 50 is arranged close to the distal end of the thrombus extraction sheath 10. The purpose of providing the developing ring 50 is to display the position of the distal end of the thrombus extraction sheath 10 in the human body, so as to judge the relative position between the cutting stent 20 and the thrombus plaque based on the positions of the distal end of the thrombus extraction sheath 10 and the thrombus plaque, and guide the removal of the thrombus plaque clearly.

[0067] Embodiment 2

[0068] The differences between Embodiment 2 and Embodiment 1 will be described below. The same or similar parts between Embodiment 2 and Embodiment 1 will not be elaborated here.

[0069] In this embodiment, as Figure 5 shown, along the axial direction of the thrombus extraction sheath 10, the cutting branch 21 includes a first connection section 2111, a cutting section 2112 and a second connection section 2113 connected in sequence. The distal end of the first connection section 2111 is connected to the thrombus extraction sheath 10, the proximal end of the second connection section 2113 is connected to the traction wire 30, and at least part of the segments of the cutting section 2112 are bent and protruded along the radial direction of the thrombus extraction sheath 10 and away from the thrombus extraction sheath 10. Specifically, when the cutting stent 20 is in the deployed state, both the first connection section 2111 and the second connection section 2113 are inclined with respect to the axis of the thrombus extraction sheath 10. The proximal end of the first connection section 2111 is inclined away from the thrombus extraction sheath 10 in the radial direction of the thrombus extraction sheath 10, and the distal end of the second connection section 2113 is inclined away from the thrombus extraction sheath 10 in the radial direction of the thrombus extraction sheath 10. The cutting section 2112 includes two connection parts 21121 respectively connected to the first connection section 2111 and the second connection section 2113 and a cutting part 21122 located between the two connection parts 21121. The connection part 21121 is parallel to the axis of the thrombus extraction sheath 10, and the cutting part 21122 is bent and protruded along the radial direction of the thrombus extraction sheath 10 and away from the thrombus extraction sheath 10. The cutting section 2112 is used for cutting the thrombus plaque.

[0070] In this embodiment, by rotating the traction wire 30, the cutting branch 21 can be driven to rotate, thereby changing the orientation of the cutting section 2112. Before cutting the plaque, the orientation of the cutting section 2112 can be adjusted by rotating the traction wire 30 so that the protruding direction of the cutting section 2112 faces the thrombus plaque directly. Then, the whole thrombus extraction device 100 is pulled axially to cut the hard thrombus or plaque by using the cutting section 2112.

[0071] Combined with Figures 5 to 7 As shown, the first connecting section 2111 is connected to the thrombus extraction sheath 10 through the connecting end 60. The connecting end 60 is movably connected to the thrombus extraction sheath 10. The distal end of the first connecting section 2111 is fixedly connected to the connecting end 60, and the connecting end 60 is embedded in the support tube 12 of the thrombus extraction sheath 10.

[0072] In this embodiment, the connecting end 60 is spherical. A connecting cavity 61 is provided on the outer surface of the thrombus extraction sheath 10. The connecting end 60 is clamped in the connecting cavity 61 and is movably connected to the connecting cavity 61. When the traction wire 30 rotates, the cutting branch 21 and the connecting end 60 can rotate synchronously with the traction wire 30, thereby adjusting the orientation of the cutting section 2112.

[0073] The cutting section 2112 can adjust its direction driven by the rotation of the traction wire 30, that is, the cutting section 2112 can protrude away from the thrombus extraction sheath 10 or protrude towards the thrombus extraction sheath 10 driven by the traction wire 30. In the initial state, the cutting section 2112 protrudes away from the thrombus extraction sheath, and under the axial movement adjustment of the traction wire 30, it can complete the contraction or expansion movement to cut the thrombus, cut the whole thrombus into multiple pieces of fragmented thrombus, and then the negative pressure device at the proximal end of the thrombus extraction sheath 10 provides suction force to extract the thrombus through the thrombus extraction hole 103. When the thrombus aspiration is completed, the doctor can control the orientation of the cutting section 2112 by rotating the traction wire 30, so that the cutting section 2112 changes from Figure 5 the direction away from the thrombus extraction sheath 10 as shown to Figure 6 the direction facing the thrombus extraction sheath as shown. At this time, pulling the traction wire 30 proximally can make the cutting branch 21 tighten, and the cutting section 2112 generates a squeezing force on the outer wall of the thrombus extraction sheath 10. The local part of the thrombus extraction sheath 10 can reduce its inner diameter under the squeezing force of the cutting section 2112, specifically as shown in Figure 7 shown.

[0074] Since the local part of the thrombus extraction sheath 10 can reduce its diameter under the squeezing force of the cutting section 2112, when the thrombus extraction sheath 10 is withdrawn from the blood vessel, it can prevent the thrombus that has not been extracted out of the body by the negative pressure device from flowing back into the blood vessel, thereby avoiding the remaining fragmented thrombus from blocking the branches downstream of the blood vessel and reducing the risk of postoperative complications.

[0075] Embodiment 3

[0076] For the same or similar parts between Embodiment 3 and Embodiment 2, they will not be described herein again. The difference between Embodiment 2 and Embodiment 1 is that in Embodiment 2, the clamping section 2122 of the cutting branch 21 is arranged in the direction facing the thrombus extraction sheath tube 10 in the initial state, and the traction wire 30 only moves axially in the adjustment channel 102, so as to better adapt to the operation of removing the mural thrombus in the narrow blood vessel.

[0077] In this embodiment, as Figure 6 and Figure 7 shown, along the axial direction of the thrombus extraction sheath tube 10, the cutting branch 21 includes a first cutting section 2121, a clamping section 2122 and a second cutting section 2123 which are connected in sequence. In the direction from the distal end to the proximal end, the first cutting section 2121, the clamping section 2122 and the second cutting section 2123 are arranged in sequence. The distal end of the first cutting section 2121 is connected to the thrombus extraction sheath tube 10, the proximal end of the second cutting section 2123 is connected to the traction wire 30, at least part of the segments of the first cutting section 2121 and at least part of the segments of the second cutting section 2123 extend along the radial direction of the thrombus extraction sheath tube 10 and away from the thrombus extraction sheath tube 10, and at least part of the segments of the clamping section 2122 are bent and protruded along the radial direction of the thrombus extraction sheath tube 10 and towards the direction close to the thrombus extraction sheath tube 10.

[0078] In this embodiment, the first cutting section 2121 includes a first cutting sub-section 21211 and a second cutting sub-section 21212 which are connected, the clamping section 2122 includes a first clamping sub-section 21221, a second clamping sub-section 21222 and a third clamping sub-section 21223 which are connected in sequence, the second cutting section 2123 includes a third cutting sub-section 21231 and a fourth cutting sub-section 21232 which are connected, the distal end of the first cutting sub-section 21211 is connected to the outer peripheral surface of the thrombus extraction sheath tube 10, and in the direction from the distal end to the proximal end, the first cutting sub-section 21211, the second cutting sub-section 21212, the first clamping sub-section 21221, the second clamping sub-section 21222, the third clamping sub-section 21223, the third cutting sub-section 21231 and the fourth cutting sub-section 21232 are connected in sequence.

[0079] When the cutting stent 20 is in the deployed state, an included angle is formed between the first cutting sub-segment 21211 and the second cutting sub-segment 21212. Specifically, the first cutting sub-segment 21211 is inclined with respect to the axis of the thrombus extraction sheath tube 10, and the proximal end of the first cutting sub-segment 21211 is inclined away from the thrombus extraction sheath tube 10 in the radial direction of the thrombus extraction sheath tube 10. The second cutting sub-segment 21212 is parallel to the axis of the thrombus extraction sheath tube 10, so that the second cutting sub-segment 21212 protrudes away from the thrombus extraction sheath tube 10 relative to the first cutting sub-segment 21211; an included angle is formed between the fourth cutting sub-segment 21232 and the third cutting sub-segment 21231. Specifically, the fourth cutting sub-segment 21232 is inclined with respect to the axis of the thrombus extraction sheath tube 10, and the proximal end of the fourth cutting sub-segment 21232 is inclined away from the thrombus extraction sheath tube 10 in the radial direction of the thrombus extraction sheath tube 10. The third cutting sub-segment 21231 is parallel to the axis of the thrombus extraction sheath tube 10, so that the third cutting sub-segment 21231 protrudes away from the thrombus extraction sheath tube 10 relative to the fourth cutting sub-segment 21232; the first clamping sub-segment 21221 and the third clamping sub-segment 21223 are respectively inclined with respect to the axis of the thrombus extraction sheath tube 10. The proximal end of the first clamping sub-segment 21221 is inclined towards the thrombus extraction sheath tube 10 in the radial direction of the thrombus extraction sheath tube 10, and the distal end of the third clamping sub-segment 21223 is inclined towards the thrombus extraction sheath tube 10 in the radial direction of the thrombus extraction sheath tube 10. The second clamping sub-segment 21222 is located between the first clamping sub-segment 21221 and the third clamping sub-segment 21223, and is bent and protruded along the radial direction of the thrombus extraction sheath tube 10 and towards the thrombus extraction sheath tube 10.

[0080] In this embodiment, when the cutting stent 20 is in the deployed state, the first cutting segment 2121 and the second cutting segment 2123 are used to cut the thrombus plaque. After the cutting of the thrombus plaque is completed, the cutting stent 20 is driven to close by pulling the traction wire 30, driving the thrombus plaque to move radially toward the side close to the thrombus extraction hole 103 along the thrombus extraction sheath tube 10. When the thrombus plaque moves near the thrombus extraction hole 103, the thrombus plaque in the blood vessel is aspirated by the negative pressure device at the proximal end of the thrombus extraction sheath tube 10. After the thrombus plaque is aspirated into the inner cavity 101 of the thrombus extraction sheath tube 10, the traction wire 30 is continuously pulled. The first cutting segment 2121 and the second cutting segment 2123 are deformed under the action of the pulling force, so that the angle between the first cutting sub-segment 21211 and the second cutting sub-segment 21212 gradually increases, and the angle between the third cutting sub-segment 21231 and the fourth cutting sub-segment 21232 gradually increases, causing the second cutting sub-segment 21212 and the third cutting sub-segment 21231 to move radially toward the direction close to the thrombus extraction sheath tube 10 as a whole. At the same time, during the deformation process of the first cutting segment 2121 and the second cutting segment 2123, the clamping segment 2122 moves radially toward the axis of the thrombus extraction sheath tube 10 driven by the first cutting segment 2121 and the second cutting segment 2123, and the second clamping sub-segment 21222 first abuts against the outer peripheral surface of the thrombus extraction sheath tube 10. By continuously pulling the traction wire 30, the clamping segment 2122 continuously moves toward the axis of the thrombus extraction sheath tube 10, so that the clamping segments 2122 in the plurality of cutting branches 21 can respectively squeeze the thrombus extraction sheath tube 10 at different positions in the circumferential direction of the thrombus extraction sheath tube 10. The inner cavity 101 of the thrombus extraction sheath tube 10 is deformed under the extrusion action, resulting in a decrease or complete closure of the inner diameter of the inner cavity 101 of the thrombus extraction sheath tube 10, so as to achieve the purpose of reducing the inner cavity 101 of the thrombus extraction sheath tube 10, avoiding the escape of the thrombus plaque in the thrombus extraction sheath tube 10 from the inner cavity 101 of the thrombus extraction sheath tube 10, and preventing the thrombus plaque remaining in the thrombus extraction sheath tube 10 without being extracted from the blood vessel from leaking out again from the thrombus extraction hole 103 or the distal end of the thrombus extraction sheath tube 10.

[0081] In some embodiments of the present invention, please refer to Figure 6 and Figure 7As shown, the radial supporting force of the clamping section 2122 is greater than that of the first cutting section 2121 and the second cutting section 2123. Specifically, the hardness of the clamping section 2122 is greater than that of the first cutting section 2121 and the second cutting section 2123, or the wire diameter of the clamping section 2122 is greater than that of the first cutting section 2121 and the second cutting section 2123. Thus, the supporting performance of the clamping section 2122 is better than that of the first cutting section 2121 and the second cutting section 2123. During the process of pulling the traction wire 30 to make the clamping section 2122 extrude the thrombus extraction sheath tube 10, the deformation amounts of the first cutting section 2121 and the second cutting section 2123 are both greater than that of the clamping section 2122, reducing the deformation amount of the overall bending shape of the clamping section 2122 to ensure that the clamping section 2122 maintains a state of protruding radially towards the axis of the thrombus extraction sheath tube 10, thereby ensuring that the clamping section 2122 can apply sufficient pressure to the thrombus extraction sheath tube 10, so that the inner cavity 101 of the thrombus extraction sheath tube 10 deforms under the clamping pressure of the clamping section 2122.

[0082] Example 4

[0083] The differences between Example 4 and Example 3 will be described below. The similarities or similarities between Example 4 and Example 3 will not be elaborated here.

[0084] In this embodiment, please refer to Figure 6 、 Figure 7 、 Figure 8 and Figure 9 As shown, the thrombus extraction device 100 further includes a film 40. The film 40 covers the distal end of the cutting stent 20 to completely cover the distal end of the cutting stent 20, exposing the proximal part of the cutting stent 20 outside the film 40, and defining an opening 1001 communicating with the thrombus extraction hole 103 between the proximal end of the film 40 and the outer peripheral surface of the thrombus extraction sheath tube 10. In this embodiment, the film 40 can be made of polytetrafluoroethylene (PTFE) film.

[0085] Furthermore, the film 40 covers the first cutting section 2121 and the clamping section 2122, exposing the second cutting section 2123 outside the film 40 to cut the thrombus or plaque by using the second cutting section 2123. After cutting the thrombus or plaque, the chopped thrombus or plaque can enter the gap space between the film 40 and the thrombus extraction sheath tube 10 through the opening 1001, or by pulling the traction wire 30, the cutting stent 20 is closed, so that the thrombus plaque is pressed into the thrombus extraction hole 103 by using the film 40, and then the thrombus is extracted by sucking or pulling back the thrombus extraction sheath tube 10.

[0086] In this embodiment, by covering the cutting stent 20 with a membrane 40, thrombus or plaque is guided into the gap space between the membrane 40 and the thrombus extraction sheath 10, and the thrombus or plaque is moved to the periphery of the thrombus extraction hole 103 through the open end 1001, thereby improving the capture efficiency of the plaque. Moreover, the membrane 40 is used to prevent the plaque from moving distally in the gap between the thrombus extraction sheath 10 and the blood vessel inner wall, so as to prevent the thrombus plaque from escaping distally through the gap between the thrombus extraction sheath 10 and the blood vessel inner wall.

[0087] It should be emphasized that the technical solution of this embodiment can be combined with any one of the embodiments in Embodiment 1, Embodiment 2, and Embodiment 3, and the technical solution that the technical solution of this embodiment can be combined with any one of the embodiments in Embodiment 1, Embodiment 2, and Embodiment 3 is also covered by the protection scope of the present invention.

[0088] According to the second aspect of the present invention, a thrombus extraction system is further provided. The thrombus extraction system includes the thrombus extraction device in any one of the embodiments of the first aspect. The thrombus extraction system further includes a negative pressure device. The proximal end of the thrombus extraction sheath is connected to the negative pressure device. By turning on the negative pressure device, the thrombus plaque in the blood vessel can be aspirated and removed by using the thrombus extraction sheath.

[0089] In some embodiments, the thrombus extraction system may further be provided with a handle assembly and a driving mechanism. The handle assembly is connected to the proximal end of the thrombus extraction sheath. By using the handle assembly, it is convenient to operate the movement of the thrombus extraction sheath in the blood vessel to complete operations such as the intervention of the thrombus extraction device, the cutting of the thrombus plaque, and the withdrawal. The driving mechanism is movably arranged on the handle assembly. The proximal end of the traction wire is connected to the driving mechanism. By operating the driving mechanism, the traction wire can be controlled to move axially relative to the thrombus extraction sheath or rotate around its own axis to control the opening and closing of the cutting stent, so as to facilitate reducing the difficulty of the surgical operation process.

[0090] The above are only specific embodiments of the present invention that are preferably selected. However, the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention should be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

1. A thrombectomy device, characterized in that, The thrombectomy device includes a thrombectomy sheath tube, a traction wire, and a cutting stent. The thrombectomy sheath tube is provided with an adjustment channel that extends along the axial direction of the thrombectomy sheath tube. The distal end of the adjustment channel penetrates through the outer peripheral surface of the thrombectomy sheath tube. The traction wire is movably arranged in the adjustment channel. The cutting stent is arranged on the outer peripheral surface of the thrombectomy sheath tube. The distal end of the cutting stent is connected to the distal side of the thrombectomy sheath tube. The distal end of the traction wire passes through the adjustment channel and is connected to the proximal end of the cutting stent. The traction wire can move along the axial direction of the thrombectomy sheath tube and pull the cutting stent, so that the cutting stent opens and closes in the radial direction of the thrombectomy sheath tube under the traction adjustment of the traction wire.

2. The thrombectomy device according to claim 1, wherein, The thrombectomy sheath tube is provided with a plurality of the adjustment channels, and one traction wire is respectively arranged in each adjustment channel; The cutting stent includes a plurality of cutting branches that extend along the axial direction of the thrombectomy sheath tube. The distal ends of the cutting branches are connected to the distal side of the thrombectomy sheath tube. The distal end of each traction wire is connected to the proximal end of at least one cutting branch.

3. The thrombectomy device according to claim 2, wherein, The plurality of adjustment channels are sequentially and spaced apart along the circumferential direction of the thrombectomy sheath tube. The plurality of cutting branches are sequentially and spaced apart along the circumferential direction of the thrombectomy sheath tube. Each of the cutting branches is independent of each other. The distal end of each traction wire is respectively connected to the proximal end of one cutting branch.

4. The thrombectomy device according to claim 2, wherein Along the distal end to the proximal end of the thrombectomy sheath tube, the cutting branch includes a first connection segment, a cutting segment, and a second connection segment that are sequentially connected. The distal end of the first connection segment is connected to the thrombectomy sheath tube. The proximal end of the second connection segment is connected to the traction wire; Wherein, at least part of the segments of the cutting segment are bent and protruded along the radial direction of the thrombectomy sheath tube and towards the direction away from the thrombectomy sheath tube.

5. The thrombectomy device according to claim 4, wherein, The first connection segment is connected to the thrombectomy sheath tube through a connection end head. The connection end head is movably connected to the thrombectomy sheath tube. The traction wire can rotate to adjust the orientation of the bent protrusion of the cutting segment; when the cutting segment is bent and protruded towards the direction close to the thrombectomy sheath tube, the movement of the traction wire along the axial direction of the thrombectomy sheath tube towards the proximal end can drive the cutting segment to squeeze the outer wall of the thrombectomy sheath tube, so that the inner diameter of the position where the thrombectomy sheath tube is squeezed is reduced.

6. The thrombectomy device according to claim 2, wherein Along the distal end to the proximal end of the thrombectomy sheath tube, the cutting branch includes a first cutting segment, a clamping segment, and a second cutting segment that are sequentially connected. The distal end of the first cutting segment is connected to the thrombectomy sheath tube. The proximal end of the second cutting segment is connected to the traction wire. At least part of the segments of the first cutting segment and at least part of the segments of the second cutting segment respectively extend along the direction away from the thrombectomy sheath tube. At least part of the segments of the clamping segment are bent and protruded along the radial direction of the thrombectomy sheath tube and towards the direction close to the thrombectomy sheath tube.

7. The thrombectomy device according to claim 6, wherein The radial supporting force of the clamping segment is greater than the larger radial supporting force of the radial supporting forces of the first cutting segment and the second cutting segment.

8. The thrombectomy device according to claim 7, characterized in that, The thrombus extraction sheath tube comprises an inner membrane tube and a support tube sleeved outside the inner membrane tube, and the roughness of the inner membrane tube is smaller than that of the support tube; the thrombus extraction sheath tube further comprises an elastic tube sleeved between the inner membrane tube and the support tube, and the elastic performance of the elastic tube is greater than that of the inner membrane tube and the support tube.

9. The thrombectomy device according to any one of claims 1 to 8, characterized in that, The thrombus extraction sheath tube is provided with at least one thrombus extraction hole communicated with the inner cavity of the thrombus extraction sheath tube, and along the axial direction of the thrombus extraction sheath tube, the thrombus extraction hole is located between the proximal end and the distal end of the cutting stent.

10. The thrombectomy device according to claim 8, wherein, The thrombus extraction device further comprises a film covering the distal side of the cutting stent, the proximal side of the cutting stent is arranged outside the film, and an opening communicated with the thrombus extraction hole is defined between the proximal side of the film and the outer peripheral surface of the thrombus extraction sheath tube.

11. A thrombectomy system, characterized in that, The thrombus extraction system comprises the thrombus extraction device according to any one of claims 1 to 10.

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