A debris removal assembly and mechanical thrombectomy device

Abstract

The present application relates to a kind of broken bolt assembly and mechanical thrombectomy device.The broken bolt assembly of the present application includes inner core tube, intermediate tube and broken bolt component, the distal end of broken bolt component is fixedly connected with the distal end of inner core tube, the proximal end is fixedly connected with the distal end of intermediate tube, by adjusting the distance between the distal end of inner core tube and the distal end of intermediate tube, broken bolt component can be converted between radial contraction state and radial expansion state, broken bolt component includes a plurality of broken bolt units arranged along the circumference of inner core tube, broken bolt unit includes two first broken bolt elements, a second broken bolt element, a third broken bolt element and a fourth broken bolt element, second broken bolt element, third broken bolt element and fourth broken bolt element are arranged between two first broken bolt elements, when broken bolt component is in radial expansion state, broken bolt component is substantially in the shape of a football and the projection of broken bolt component on cross section is regular polygonal star shape, the edge of regular polygonal star shape is composed of the projection of fourth broken bolt element on cross section.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of medical devices, and particularly relates to a thrombus fragmentation assembly and a mechanical thrombectomy device. BACKGROUND

[0002] A mechanical thrombectomy device is a device for removing thrombi and emboli from a blood vessel or a vascular stent (for example, a venous stent implanted in a blood vessel). When the mechanical thrombectomy device is in operation, a large thrombus is cut into several small thrombi and then is sucked out of the body. The effect of the mechanical thrombectomy device is directly related to the thrombus fragmentation assembly used to cut the thrombus.

[0003] Most of the existing thrombus fragmentation assemblies are designed for thrombi in blood vessels with small diameters. For thrombi with large sizes and high densities, the existing thrombus fragmentation assemblies are difficult to cut them into smaller sizes in a short time, resulting in an increase in the number of cutting times and a prolongation of the time. SUMMARY

[0004] The purpose of the present application is to provide a new thrombus fragmentation assembly that can quickly cut thrombi with large sizes and / or high densities into more smaller sizes.

[0005] Another purpose of the present application is to provide a mechanical thrombectomy device comprising the new thrombus fragmentation assembly.

[0006] To achieve the above purposes, the technical solution adopted by the present application is as follows:

[0007] The first aspect of the present application provides a broken bolt assembly, which comprises an inner core tube, an intermediate tube and a broken bolt component, the intermediate tube is slidably sleeved on the inner core tube, the broken bolt component is sleeved on the distal end of the inner core tube, the distal end of the broken bolt component is fixedly connected with the distal end of the inner core tube, the proximal end of the broken bolt component is fixedly connected with the distal end of the intermediate tube, the broken bolt component has a radially contracted state and a radially expanded state, the distance between the distal end of the inner core tube and the distal end of the intermediate tube can be adjusted to convert the broken bolt component between the radially contracted state and the radially expanded state, the broken bolt component comprises a plurality of broken bolt units arranged along the circumference of the inner core tube, the broken bolt unit comprises two first broken bolt elements, a second broken bolt element, a third broken bolt element and a fourth broken bolt element, the distal end of the first broken bolt element is fixedly connected with the distal end of the inner core tube, the proximal end of the first broken bolt element is fixedly connected with the distal end of the intermediate tube, the second broken bolt element, the third broken bolt element and the fourth broken bolt element are arranged between the two first broken bolt elements, the distal end of the second broken bolt element is fixedly connected with the distal end of the inner core tube, the proximal end of the third broken bolt element is fixedly connected with the distal end of the intermediate tube, the proximal end of the second broken bolt element and the distal end of the third broken bolt element are respectively connected with the middle part of the two first broken bolt elements through the fourth broken bolt element, the opening formed between the two first broken bolt elements has a larger opening degree when the broken bolt component is in the radially expanded state than when the broken bolt component is in the radially contracted state, when the broken bolt component is in the radially expanded state, the broken bolt component is substantially in the shape of a rugby ball, and the projection of the fourth broken bolt element on the cross section is a regular polygonal star shape.

[0008] In the present application, when the broken bolt component is in the radially expanded state, the broken bolt component is divided into a first part with gradually increasing outer diameter from proximal end to distal end, a second part with constant outer diameter, and a third part with gradually decreasing outer diameter from proximal end to distal end along the axial direction from proximal end to distal end, the outer diameter of the second part is equal to the outer diameter of the distal end of the first part and the proximal end of the third part, so as to be substantially in the shape of a rugby ball. When the broken bolt component is in the radially expanded state, the rugby ball structure is formed by the first broken bolt elements, and the second broken bolt element, the third broken bolt element and the fourth broken bolt element are located inside the rugby ball structure, so that when the broken bolt component is in the radially expanded state, the projection of the broken bolt component on the cross section is a regular polygonal star shape, and the edges of the regular polygonal star shape are composed of the projection of the fourth broken bolt element on the cross section.

[0009] In the present application, the thrombus cutting member can cut larger thrombus into smaller size, facilitate the thrombus to be pumped out of the body, has higher radial support force when cutting the thrombus, and improves the cutting effect on the thrombus with dense structure.

[0010] In the present application, the thrombus cutting member can cut larger thrombus into smaller size, facilitate the thrombus to be pumped out of the body, has higher radial support force when cutting the thrombus, and improves the cutting effect on the thrombus with dense structure.

[0011] Further, the number of the thrombus cutting units is 3-12.

[0012] Further, the number of the thrombus cutting units is 4-10.

[0013] Further, the number of the thrombus cutting units is 5-8.

[0014] According to some specific embodiments, the number of the thrombus cutting units is 6, and the projection of the thrombus cutting member in the cross section is a regular hexagonal star when the thrombus cutting member is in the radial expansion state.

[0015] Further, the fourth thrombus cutting element is a deformable closed frame structure, which can achieve better cutting effect.

[0016] According to some specific embodiments, the fourth thrombus cutting element comprises a first rod, a second rod, a third rod and a fourth rod connected in sequence, the distal end of the first rod is fixedly connected with the proximal end of the second thrombus cutting element, the proximal end of the first rod is fixedly connected with the middle part of one of the first thrombus cutting elements, the distal end of the second rod is fixedly connected with the proximal end of the second thrombus cutting element, the proximal end of the second rod is fixedly connected with the middle part of another of the first thrombus cutting elements, the proximal end of the third rod is fixedly connected with the distal end of the third thrombus cutting element, the distal end of the third rod is fixedly connected with the middle part of one of the first thrombus cutting elements, the proximal end of the fourth rod is fixedly connected with the distal end of the third thrombus cutting element, and the distal end of the fourth rod is fixedly connected with the middle part of another of the first thrombus cutting elements.

[0017] Further, when the thrombus cutting member is transformed from the radial contraction state to the radial expansion state, the distal end of the thrombus cutting member approaches the proximal end of the thrombus cutting member.

[0018] In the present application, the degree of radial expansion of the thrombus crushing component can be adjusted by operating the intermediate tube to adapt to the change of the inner diameter of the blood vessel or the inner diameter of the vascular stent, and the controllability is relatively strong. Therefore, the axial length of the thrombus crushing component can be increased, the working area is larger, the cutting frequency and time can be reduced for the same lesion area, the efficiency of the operation is improved, the operation time is shortened, and the pain of the patient is reduced.

[0019] According to some specific embodiments, the axis of the inner core tube, the axis of the intermediate tube and the axis of the thrombus crushing component coincide.

[0020] Further, when the thrombus crushing component is in the radial contraction state, the thrombus crushing component is attached to or close to the inner core tube.

[0021] Further, when the thrombus crushing component is in the radial contraction state, the first thrombus element extends substantially along the axial direction of the inner core tube, and the opening formed between the adjacent two first thrombus elements is strip-shaped. When the thrombus crushing component is in the radial contraction state, the second thrombus element and the third thrombus element also extend substantially along the axial direction of the inner core tube. When the thrombus crushing component is in the radial expansion state, in each thrombus unit, the second thrombus element, the first rod connected thereto and the second rod connected thereto form a nearly "human" shaped cutting structure, and the third thrombus element, the third rod connected thereto and the fourth rod connected thereto form a nearly "human" shaped cutting structure.

[0022] According to some specific embodiments, the thrombus crushing component is axially symmetric, and there are 12 groups of the above-mentioned nearly "human" shaped cutting structures, which can quickly cut the large and / or relatively dense thrombus into more smaller sizes.

[0023] Further, when the thrombus crushing component is in the radial expansion state, the distance from the middle part of the first thrombus element to the inner core tube is 2-5 times the distance from the proximal end of the second thrombus element to the inner core tube and / or the distance from the distal end of the third thrombus element to the inner core tube.

[0024] Further, the maximum outer diameter of the thrombus crushing component in the radial contraction state is 1.5-4 mm.

[0025] Further, the maximum outer diameter of the thrombus crushing component in the radial expansion state is 2-20 mm, and the maximum outer diameter of the thrombus crushing component in the radial expansion state is greater than the outer diameter of the thrombus crushing component in the radial contraction state.

[0026] Further, the first broken bolt element, the second broken bolt element, the third broken bolt element, the first rod, the second rod, the third rod and the fourth rod have a width of 0.1mm-1mm and a thickness of 0.1mm-0.5mm, respectively.

[0027] Further, the axial length of the broken bolt component in the radial contraction state is 10mm-100mm.

[0028] Further, the material of the broken bolt component is one or more of shape memory metal, shape memory alloy or polymer.

[0029] Further, the material of the broken bolt component is one or more of shape memory metal, shape memory alloy or polymer.

[0030] Further, the material of the inner core tube, the intermediate tube and the suction tube is metal and / or polymer.

[0031] Further, the material of the inner core tube, the intermediate tube and the suction tube is metal and / or polymer.

[0032] Further, the inner core tube is provided with a guide wire cavity extending from one end to the other end for guiding a guide wire therethrough.

[0033] A mechanical thrombectomy device, comprising the broken bolt assembly, an operation handle arranged between the proximal end of the inner core tube and the proximal end of the intermediate tube, a first driving component arranged on the operation handle and capable of driving the inner core tube to slide relative to the intermediate tube, a second driving component capable of driving the inner core tube and the intermediate tube to rotate around their own axes so as to drive the broken bolt component to rotate around its own axis, a suction tube slidably sleeved on the intermediate tube, and a suction device connected to the proximal end of the suction tube, wherein the broken bolt component can be accommodated in the suction tube when the broken bolt component is in the radial contraction state, and the broken bolt component extends out of the distal end of the suction tube when the broken bolt component is in the radial expansion state.

[0034] Further, the mechanical thrombectomy device further comprises a guide wire.

[0035] Due to the use of the above technical solutions, the present application has the following advantages compared with the prior art:

[0036] The thrombus crushing assembly can cut a larger thrombus in a blood vessel or a blood vessel stent into smaller sizes, facilitates the thrombus to be pumped out of the body, can provide higher radial support force when cutting the thrombus, improves the cutting effect on the thrombus with dense structure, can adjust the radial expansion degree of the thrombus crushing component by operating the inner core tube, adapts to the changes of the inner diameter of the blood vessel or the inner diameter of the blood vessel stent at the lesion site, has strong controllability, thus the axial length of the thrombus crushing component can be increased, the working area is larger, the cutting times and time can be reduced for the same lesion area, the efficiency of the operation is improved, the operation time is shortened, and the pain of the patient is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0037] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0038] Figure 1 It is a structural schematic view of the mechanical thrombectomy device of embodiment 1 (the suction device is not shown);

[0039] Figure 2 It is a sectional view of the mechanical thrombectomy device of embodiment 1 (the thrombus crushing component is not shown); Figure 1

[0040] Figure 3 It is a perspective structural schematic view of the thrombus crushing component in the mechanical thrombectomy device of embodiment 1;

[0041] Figure 4 It is a front view of the thrombus crushing component in the mechanical thrombectomy device of embodiment 1;

[0042] Figure 5 It is a front view of the thrombus crushing component in the mechanical thrombectomy device of embodiment 1 from another perspective;

[0043] Figure 6 It is a projection view of the thrombus crushing component in the mechanical thrombectomy device of embodiment 1 on the cross section,

[0044] In the above drawings: 1, inner core tube; 2, intermediate tube; 3, thrombus crushing component; 31, first thrombus crushing element; 32, second thrombus crushing element; 33, third thrombus crushing element; 341, first rod; 342, second rod; 343, third rod; 344, fourth rod; 4, suction tube; 5, operation handle; 61, first driving component; 62, second driving component; 7, guide wire. DETAILED DESCRIPTION

[0045] ​In the following, only certain exemplary embodiments are simply described. As those skilled in the art can recognize, the described embodiments can be modified in various different ways without departing from the spirit or scope of the embodiments of the present application. Therefore, the drawings and descriptions are to be regarded as illustrative in nature rather than restrictive.

[0046] In the description of the present application, it needs to be understood that the distal end refers to the end of the instrument or component far away from the operator (for example, medical staff), the proximal end refers to the end of the instrument or component close to the operator (for example, medical staff), the axial direction refers to the direction parallel to the center line connecting the distal end and the proximal end of the instrument or component, the radial direction refers to the direction perpendicular to the axial direction, and the inner and outer are defined as the position relative to the center of the instrument or component, wherein the inner is the position close to the center of the instrument or component, and the outer is the position far away from the center of the instrument or component. The above orientation words are only for the convenience of describing the embodiments of the present application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0047] In the present application, the terms "first", "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, for example, two, three, etc., unless otherwise explicitly specified.

[0048] In the present application, unless otherwise explicitly specified and limited, in the description of the present application, the terms "connected", "fixed" and the like should be understood in a broad sense, for example, can be fixedly connected or integrated. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0049] In the present application, the thickness of the element refers to the distance between the two surfaces of the element in the radial direction of the splint component, the width of the element refers to the distance between the two sides of the element in the circumferential direction of the splint component, and the length of the element refers to the distance between the two end surfaces of the element in the axial direction of the splint component, and the thickness, width and length are the values measured when the splint component is in the radial contraction state.

[0050] The embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0051] Embodiment 1

[0052] As Figure 1As shown, the present embodiment provides a mechanical thrombectomy device, which comprises a thrombus crushing assembly, an operation handle 5, a suction tube 4, a suction device (not shown in the figure) and a guide wire 7. Figure 1 and Figure 2

[0053] Specifically, the thrombus crushing assembly comprises an inner core tube 1, an intermediate tube 2 and a thrombus crushing component 3. The intermediate tube 2 is sleeved on the inner core tube 1 in a relatively slidable manner, and the distal end of the inner core tube 1 extends out of the intermediate tube 2. The thrombus crushing component 3 is sleeved on the distal end of the inner core tube 1, and the distal end of the thrombus crushing component 3 is fixedly connected with the distal end of the inner core tube 1, and the proximal end of the thrombus crushing component 3 is fixedly connected with the distal end of the intermediate tube 2. The thrombus crushing component 3 has a radially contracted state and a radially expanded state. The thrombus crushing component 3 can be converted between the radially contracted state and the radially expanded state by adjusting the distance between the distal end of the inner core tube 1 and the distal end of the intermediate tube 2. When the thrombus crushing component 3 is converted from the radially contracted state to the radially expanded state, the distal end of the thrombus crushing component 3 approaches the proximal end of the thrombus crushing component 3. In the present embodiment, the central axis of the inner core tube 1, the central axis of the intermediate tube 2 and the central axis of the thrombus crushing component 3 coincide. The inner core tube 1 is provided with a guide wire lumen extending from one end to the other end thereof for the guide wire 7 to pass through. The operation handle 5 is arranged between the proximal end of the inner core tube 1 and the proximal end of the intermediate tube 2. The first driving component 61 is arranged on the operation handle 5 and can drive the inner core tube 1 to slide relative to the intermediate tube 2. The second driving component 62 is arranged on the operation handle 5 and can drive the inner core tube 1 and the intermediate tube 2 to rotate about their own axes, thereby driving the thrombus crushing component 3 to rotate about its own axis. The suction tube 4 is sleeved on the intermediate tube 2 in a slidable manner, and the suction device is connected with the proximal end of the suction tube 4.

[0054] Specifically, the thrombus crushing component 3 comprises a plurality of thrombus crushing units arranged along the circumference of the inner core tube 1. Each thrombus crushing unit comprises two first thrombus elements 31, a second thrombus element 32, a third thrombus element 33 and a fourth thrombus element. The distal end of each first thrombus element 31 is fixedly connected with the distal end of the inner core tube 1, and the proximal end of each first thrombus element 31 is fixedly connected with the distal end of the intermediate tube 2. The second thrombus element 32, the third thrombus element 33 and the fourth thrombus element are arranged between the two first thrombus elements 31. The distal end of the second thrombus element 32 is fixedly connected with the distal end of the inner core tube 1, and the proximal end of the third thrombus element 33 is fixedly connected with the distal end of the intermediate tube 2. The proximal end of the second thrombus element 32 and the distal end of the third thrombus element 33 are respectively connected with the middle portions of the two first thrombus elements 31 through the fourth thrombus element. The opening formed between the two first thrombus elements 31 has a larger opening degree when the thrombus crushing component 3 is in the radially expanded state than when the thrombus crushing component 3 is in the radially contracted state. When the thrombus crushing component 3 is in the radially expanded state, the thrombus crushing component 3 is substantially in the shape of an American football. The projection of the fourth thrombus element on the cross section is in the shape of a regular polygonal star. Figures 3 to 6 ​As shown, in this embodiment, the number of broken bolt units is 6, and when the broken bolt component 3 is in the radial expansion state, its projection on the cross section is a regular hexagonal star. The fourth broken bolt element is a deformable closed frame structure to achieve better cutting effect, which includes a first rod 341, a second rod 342, a third rod 343 and a fourth rod 344 connected end to end in turn. The distal end of the first rod 341 is fixedly connected with the proximal end of the second broken bolt element 32, and the proximal end of the first rod 341 is fixedly connected with the middle part of one of the first broken bolt elements 31. The distal end of the second rod 342 is fixedly connected with the proximal end of the second broken bolt element 32, and the proximal end of the second rod 342 is fixedly connected with the middle part of another of the first broken bolt elements 31. The proximal end of the third rod 343 is fixedly connected with the distal end of the third broken bolt element 33, and the distal end of the third rod 343 is fixedly connected with the middle part of one of the first broken bolt elements 31. The proximal end of the fourth rod 344 is fixedly connected with the distal end of the third broken bolt element 33, and the distal end of the fourth rod 344 is fixedly connected with the middle part of another of the first broken bolt elements 31. In this embodiment, when the broken bolt component 3 is in the radial contraction state, the broken bolt component 3 is attached to the inner core tube 1. In this embodiment, when the broken bolt component 3 is in the radial expansion state, the distance from the middle part of the first broken bolt element 31 to the inner core tube 1 is about 3 times the distance from the proximal end of the second broken bolt element 32 to the inner core tube 1 and / or the distance from the distal end of the third broken bolt element 33 to the inner core tube 1. In this embodiment, the maximum outer diameter of the broken bolt component 3 when it is in the radial contraction state is 4 mm, and the maximum outer diameter of the broken bolt component 3 when it is in the radial expansion state is 20 mm. In this embodiment, the width of the first broken bolt element 31, the second broken bolt element 32, the third broken bolt element 33, the first rod 341, the second rod 342, the third rod 343 and the fourth rod 344 is independently 1 mm, and the thickness is independently 0.2 mm. In this embodiment, the axial length of the broken bolt component 3 when it is in the radial contraction state is 50 mm (approximately the length of the first broken bolt element 31). In other embodiments, the parameters of the broken bolt component 3 can be adjusted as needed.

[0055] In this embodiment, the inner core tube 1 is a metal rigid tube, the intermediate tube 2 and the suction tube 4 are both Pebax extruded tubes, and the material of the broken bolt component 3 is nickel-titanium alloy.

[0056] In this embodiment, when the broken bolt component 3 is in the radial contraction state, the broken bolt component 3 can be accommodated in the suction tube 4, and when the broken bolt component 3 is in the radial expansion state, the broken bolt component 3 extends out of the distal end of the suction tube 4.

[0057] The above merely describes the preferred embodiments of the present application, and is not used to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A bolt breaking assembly, characterized in that: The bolt-breaking assembly comprises: Inner core tube (1), The intermediate tube (2) is relatively slidably sleeved on the inner core tube (1). The bolt-breaking component (3) is sleeved on the distal end of the inner core tube (1), the distal end of the bolt-breaking component (3) is fixedly connected to the distal end of the inner core tube (1), and the proximal end of the bolt-breaking component (3) is fixedly connected to the distal end of the intermediate tube (2). The bolt-breaking component (3) has a radial contraction state and a radial expansion state. By adjusting the distance between the distal end of the inner core tube (1) and the distal end of the intermediate tube (2), the bolt-breaking component (3) can be switched between the radial contraction state and the radial expansion state. The bolt-breaking component (3) comprises a plurality of bolt-breaking units arranged along the circumference of the inner core tube (1), wherein the bolt-breaking units comprise two first bolt-breaking elements (31), a second bolt-breaking element (32), a third bolt-breaking element (33) and a fourth bolt-breaking element. The distal end of the first plug-breaking element (31) is fixedly connected to the distal end of the inner core tube (1), and the proximal end of the first plug-breaking element (31) is fixedly connected to the distal end of the intermediate tube (2). The second bolt-breaking element (32), the third bolt-breaking element (33) and the fourth bolt-breaking element are arranged between the two first bolt-breaking elements (31), the distal end of the second bolt-breaking element (32) is fixedly connected to the distal end of the inner core tube (1), the proximal end of the third bolt-breaking element (33) is fixedly connected to the distal end of the intermediate tube (2), the proximal end of the second bolt-breaking element (32) and the distal end of the third bolt-breaking element (33) are respectively connected to the middle parts of the two first bolt-breaking elements (31) through the fourth bolt-breaking element. The opening formed between the two first bolt-breaking elements (31) is larger in opening degree when the bolt-breaking component (3) is in a radially expanded state than in opening degree when the bolt-breaking component (3) is in a radially contracted state. When the bolt-breaking component (3) is in the radially expanded state, the bolt-breaking component (3) is roughly in the shape of a rugby ball, and the projection of the fourth bolt-breaking element on the cross section is a regular polygonal star.

2. The bolt breaker assembly according to claim 1, characterized in that: The number of the bolt-breaking units is 3 to 12.

3. The bolt breaking assembly according to claim 1, characterized in that: The number of the bolt-breaking units is 6, and when the bolt-breaking component (3) is in a radially expanded state, its projection on the cross section is a regular hexagonal star.

4. The bolt breaking assembly according to claim 1, characterized in that: The fourth bolt-breaking element is a deformable closed frame structure.

5. The plug breaking assembly according to claim 1 or 4, characterized in that: The fourth bolt-breaking element comprises a first rod (341), a second rod (342), a third rod (343) and a fourth rod (344) which are connected end to end in sequence. The distal end of the first rod (341) is fixedly connected to the proximal end of the second plug-breaking element (32), and the proximal end of the first rod (341) is fixedly connected to the middle portion of one of the first plug-breaking elements (31). The distal end of the second rod (342) is fixedly connected to the proximal end of the second plug-breaking element (32), and the proximal end of the second rod (342) is fixedly connected to the middle portion of another first plug-breaking element (31). The proximal end of the third rod (343) is fixedly connected to the distal end of the third plug-breaking element (33), and the distal end of the third rod (343) is fixedly connected to the middle portion of one of the first plug-breaking elements (31). The proximal end of the fourth rod (344) is fixedly connected to the distal end of the third plug-breaking element (33), and the distal end of the fourth rod (344) is fixedly connected to the middle part of another first plug-breaking element (31).

6. The plug breaking assembly according to claim 1, characterized in that: When the bolt-breaking component (3) changes from a radially contracted state to a radially expanded state, the distal end of the bolt-breaking component (3) approaches the proximal end of the bolt-breaking component (3).

7. The breaker plug assembly according to claim 1, characterized in that: The axis of the inner core tube (1), the axis of the intermediate tube (2) and the axis of the plug-breaking component (3) coincide with each other. When the plug-breaking component (3) is in the radially contracted state, the plug-breaking component (3) is attached to or close to the inner core tube (1).

8. The breaker plug assembly according to claim 1, characterized in that: When the bolt-breaking component (3) is in the radially expanded state, the distance from the middle of the first bolt-breaking element (31) to the inner core tube (1) is 2 to 5 times the distance from the proximal end of the second bolt-breaking element (32) to the inner core tube (1) and / or the distance from the distal end of the third bolt-breaking element (33) to the inner core tube (1).

9. The breaker plug assembly according to claim 1, characterized in that: The maximum outer diameter of the plug-breaking component (3) when in a radially contracted state is 1.5 mm to 4 mm; And / or, the maximum outer diameter of the bolt-breaking component (3) when in a radially expanded state is 2 mm to 20 mm, and the maximum outer diameter of the bolt-breaking component (3) when in a radially expanded state is greater than the outer diameter of the bolt-breaking component (3) when in a radially contracted state.

10. The breaking plug assembly according to claim 5, characterized in that: The widths of the first bolt-breaking element (31), the second bolt-breaking element (32), the third bolt-breaking element (33), the first rod (341), the second rod (342), the third rod (343) and the fourth rod (344) are independently 0.1 mm to 1 mm, and the thicknesses are independently 0.1 mm to 0.5 mm; And / or, the axial length of the plug-breaking component (3) when in a radially contracted state is 10 mm to 100 mm.

11. The breaker plug assembly according to claim 1, characterized in that: The material of the bolt-breaking component (3) is one or more of shape memory metal, shape memory alloy, and high molecular polymer; And / or, the inner core tube (1) is provided with a guide wire cavity extending from one end to the other end thereof for the guide wire (7) to pass through.

12. A mechanical thrombectomy device, characterized in that: The mechanical thrombectomy device includes a thrombus-breaking assembly according to any one of claims 1 to 11, an operating handle (5) arranged between the proximal end of the inner core tube (1) and the proximal end of the intermediate tube (2), a first driving component (61) arranged on the operating handle (5) capable of driving the inner core tube (1) to slide relative to the intermediate tube (2), a second driving component (62) capable of driving the inner core tube (1) and the intermediate tube (2) to rotate around their own axes thereby driving the thrombus-breaking component (3) to rotate around their own axes, a suction tube (4) slidably mounted on the intermediate tube (2) and a suction device connected to the proximal end of the suction tube (4), when the thrombus-breaking component (3) is in a radially contracted state, the thrombus-breaking component (3) can be accommodated in the suction tube (4), and when the thrombus-breaking component (3) is in the radially expanded state, the thrombus-breaking component (3) extends out of the distal end of the suction tube (4).

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