WO2023051257A1

WO2023051257A1 - Thrombectomy apparatus

Info

Publication number: WO2023051257A1
Application number: PCT/CN2022/118889
Authority: WO
Inventors: 李安宁; 邱礼彪
Original assignee: 先健科技(深圳)有限公司
Priority date: 2021-09-28
Filing date: 2022-09-15
Publication date: 2023-04-06

Abstract

A thrombectomy apparatus (1), comprising a thrombectomy device (30) and an elastic member (50). The elastic member (50) is provided in a space enclosed by the thrombectomy device (30); a proximal end of the elastic member (50) is fixedly connected to a proximal end of the thrombectomy device (30); a distal end of the elastic member (50) is fixedly connected to a distal end of the thrombectomy device (30); by means of a restoration force of the elastic member (50), the distal end and the proximal end of the thrombectomy device (30) are made to be close to each other, too much increase in a distance between the proximal end and the distal end of the thrombectomy device (30) is avoided, the degree of shrinkage of the thrombectomy device (30) in a radial direction is reduced, the thrombectomy device (30) is ensured to be able to be tightly attached to the inner wall of a blood vessel, and the success rate of dragging thrombus (200) into a microcatheter (10) is increased.

Description

Thrombectomy device

technical field

The invention relates to the field of medical instruments, in particular to a thrombectomy device.

Background technique

This section provides background information related to the present disclosure only and is not necessarily prior art.

Acute ischemic stroke (AIS, commonly known as cerebral infarction) is the damage of nerve tissue caused by ischemic necrosis of local brain tissue caused by sudden blockage of blood flow in the brain. Acute ischemic stroke is the most common type of stroke and the main cause of death and disability in middle-aged and elderly people. Especially acute stroke caused by large vessel occlusion is a dangerous condition with high mortality and disability rates. Once a stroke occurs, it will cause great physical and mental harm to the patient, and also cause a heavy burden to the patient's family and society.

At present, the clinical treatment of ischemic stroke mainly adopts mechanical thrombectomy. Mechanical thrombectomy is to deliver the thrombus retriever to the lesion site, use the thrombus retriever to grab the thrombus and take it out of the body. However, when the current thrombectomy device is retracted into the catheter, the thrombectomy device is subjected to external force, the whole thrombectomy device is elongated in the axial direction, and the thrombectomy device shrinks in the radial direction, so that the thrombectomy device cannot touch the inner wall of the blood vessel. The tight fit makes the thrombus fall off easily.

Contents of the invention

Based on this, it is necessary to provide a thrombus retriever that can reduce the shrinkage of the thrombus retriever in the radial direction and ensure that it can closely fit the inner wall of the blood vessel.

The thrombus retrieval device includes a thrombus retriever and an elastic member, the elastic member is arranged in the space surrounded by the thrombus retriever, and the proximal end of the elastic member is fixedly connected to the proximal end of the thrombus retriever, so The distal end of the elastic member is fixedly connected to the distal end of the thrombus retriever, the elastic member is elastic, and when the thrombus retriever is in a compressed state, the elastic member can make the distal end of the thrombus retriever and the proximal end of the thrombus retriever are close to each other.

In a natural state, the elastic member extends helically in the axial direction.

The thrombus retriever includes a catching part for catching thrombus, and the elastic member includes a flat section, and the flat section is opposite to the catching part.

The elastic member includes a main body and a puncture member connected with the main body, and the puncture member can penetrate thrombus.

The angle between the piercing member and the main body support is an acute angle.

The piercing member is fixedly connected to the outer surface of the main body.

The piercing element is sheathed on the outer surface of the main body, and the piercing element can rotate around the main body.

The elastic member includes two or more than two helical wires, and the helical wires extend helically to each other in the axial direction.

The proximal ends of the two or more helical wires are in close contact with the proximal end of the thrombus retriever, and the distal ends of the two or more helical wires are in close contact with the thrombus retriever. The remote fixed connection.

In a natural state, a receiving space is enclosed between the two or more than two helical wires.

In the present application, the restoring force of the elastic member makes the distal end and the proximal end of the thrombus retriever approach each other, avoiding the distance between the proximal end of the thrombus retriever and the distal end of the thrombus retriever from increasing too much, and reducing the The degree of contraction in the radial direction ensures that the thrombus retriever can closely fit the inner wall of the blood vessel, improving the success rate of dragging the thrombus into the microcatheter.

Based on this, it is necessary to provide a thrombectomy device that can well conform to the curved blood vessel, closely fit the inner wall of the curved blood vessel, and effectively prevent the thrombus from falling off.

The thrombus removal device includes a thrombus remover, and the thrombus remover includes a proximal bracket, a middle bracket, and a distal bracket arranged sequentially from the proximal end to the distal end, and the middle bracket includes first connecting rods and The second connecting rod, the proximal end of the first connecting rod is connected with the proximal bracket, the distal end of the second connecting rod is connected with the distal bracket, the first connecting rod is connected with the second The connecting rod extends like a circumferential curve on the peripheral surface of the thrombus retriever.

There is a virtual connection line on the peripheral surface of the thrombus retriever between the distal end of the first connecting rod and the proximal end of the second connecting rod, the first connecting rod, the virtual connection line and The second linkage may form a helix about the longitudinal central axis of the retriever.

The number of the first connecting rod is two, the number of the second connecting rod is two, and there is a virtual line between one of the first connecting rods and one of the second connecting rods, and in addition There is also a virtual connection between one of the first connecting rods and the other second connecting rod, and the virtual connection between the first connecting rod, the first connecting rod and the second connecting rod The wire and the second connecting rod form two helical lines around the longitudinal central axis of the thrombus retriever, and the two helical lines are not connected to each other.

The middle support includes a first grabbing part, the first grabbing part and the first connecting rod are arranged adjacent to the peripheral surface of the thrombus retriever, and the proximal end of the first grabbing part It is fixedly connected with the proximal support, and the distal end of the first catching part is suspended.

The first capturing part includes a first sub-catching part and a second sub-catching part, the first sub-catching part and the second sub-catching part are spaced apart on the peripheral surface of the thrombus retriever Setting, the first connecting rod is arranged between the first sub-catching part and the second sub-catching part, and the first sub-catching part and the second sub-catching part are at least one Projections on a plane containing the longitudinal central axis of the retriever partially overlap.

The middle bracket also includes a second catch part, the second catch part and the first catch part are arranged sequentially from the proximal end to the far end, and the proximal end of the second catch part is connected to the first catch part. The distal end of a connecting rod is fixedly connected, the distal end of the second catching part is suspended, the distal end of the second catching part and the distal end of the first catching part are perpendicular to the The projections on the plane of the longitudinal central axis of the device are spaced from each other.

The middle bracket also includes a third catch part, the far end of the third catch part is suspended, and the first catch part, the third catch part and the second catch part are connected from the proximal end to the distal end. The directions are arranged sequentially, the proximal end of the third catch part is connected to the first connecting rod, the far end of the third catch part is adjacent to the second connecting rod, and the first catch part The projection of at least two adjacent ones of the distal end of the part, the distal end of the third catching part and the distal end of the second catching part on a plane perpendicular to the longitudinal central axis of the thrombus retriever spaced from each other.

The middle bracket also includes a third link, the third link is connected between the first link and the second link, the first link, the third link, the The second connecting rod extends like a circumferential curve on the peripheral surface of the thrombus retriever.

There is a first virtual connection line on the peripheral surface of the thrombus retriever between the distal end of the first connecting rod and the proximal end of the third connecting rod, and the distal end of the third connecting rod and the There is also a second virtual connection line on the peripheral surface of the thrombus retriever between the proximal ends of the second connecting rod, the first connecting rod, the first virtual connecting line, the third connecting rod, all The second virtual line and the second connecting rod may form a helix around the longitudinal central axis of the thrombus retriever.

Part of the first connecting rod and part of the second connecting rod are parallel to each other.

In the thrombectomy device provided by the present application, since the first connecting rod and the second connecting rod extend like a circumferential curve on the peripheral surface of the thrombus remover, the proximal bracket and the distal bracket can be moved along the first connecting rod, The second connecting rod is bent in a quasi-circumferential direction so that the entire thrombus retriever has a shape similar to a helical extension from the proximal end to the distal end, thereby improving the bending performance of the thrombus retriever. When the thrombus retriever is in a curved blood vessel, its shape similar to the helical extension can be bent and deformed, and it can well conform to the curved blood vessel. The thrombus retriever can closely fit the inner wall of the curved blood vessel, effectively preventing the thrombus from falling off.

Description of drawings

FIG. 1 is a schematic structural diagram of a thrombus retrieval device capturing a thrombus in a human blood vessel according to the first embodiment of the present application.

Fig. 2 is a schematic cross-sectional structural view of the thrombus retrieval device provided in the first embodiment of the present application in a natural state.

Fig. 3 is a schematic cross-sectional structural view of the thrombectomy device provided in the first embodiment of the present application in a compressed state.

Fig. 4 is a schematic diagram of the three-dimensional structure of the thrombus remover in the first embodiment of the present application.

Fig. 5 is a schematic diagram of the three-dimensional structure of another angle thrombus retriever in the first embodiment of the present application.

Fig. 6 is a schematic diagram of the deployment of the thrombus remover in the first embodiment of the present application.

FIG. 7 is an enlarged schematic view at X in FIG. 6 .

FIG. 8 is an enlarged schematic view at XX in FIG. 6 .

FIG. 9 is a schematic cross-sectional view of the thrombus retrieval device provided by the second embodiment of the present application.

Fig. 10 is a schematic cross-sectional view of the thrombus retriever in the second embodiment of the present application.

Fig. 11 is a schematic cross-sectional view of the thrombus retrieval device provided by the third embodiment of the present application.

FIG. 12 is a schematic diagram of the elastic member in the third embodiment of the present application.

Fig. 13 is a schematic cross-sectional view of the thrombus retrieval device provided by the fourth embodiment of the present application.

Fig. 14 is a schematic cross-sectional view of the thrombus retriever in the fourth embodiment of the present application.

Fig. 15 is a schematic cross-sectional view of the thrombus remover in the thrombectomy device provided by the fifth embodiment of the present application.

Fig. 15a is a schematic diagram of an enlarged structure at point I in Fig. 15 of the present application.

Fig. 16 is a cross-sectional view of the piercing member in the thrombectomy device according to the fifth embodiment of the present application.

Fig. 17 is a cross-sectional view at another angle of the piercing member in the thrombectomy device provided by the fifth embodiment of the present application.

Fig. 18 is a schematic cross-sectional view of the thrombus remover in the thrombus removal device provided by the sixth embodiment of the present application.

Fig. 19 is a schematic structural view of the elastic member in the thrombectomy device provided by the sixth embodiment of the present application.

Fig. 20 is a schematic structural view of the elastic member in the thrombectomy device provided by the seventh embodiment of the present application.

Detailed ways

In order to make the above objects, features and advantages of the present invention more comprehensible, specific implementations of the present invention will be described in detail below in conjunction with the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. However, the present invention can be implemented in many other ways different from those described here, and those skilled in the art can make similar improvements without departing from the connotation of the present invention, so the present invention is not limited by the specific implementations disclosed below.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field of the invention. The terms used herein in the description of the present invention are for the purpose of describing specific embodiments only, and are not intended to limit the present invention.

In the field of interventional medical devices, the "distal end" is defined as the end away from the operator during the operation, and the "proximal end" is defined as the end close to the operator during the operation. "Axial" refers to the direction parallel to the line connecting the center of the distal end and the center of the proximal end of the medical device, and "radial" refers to the direction perpendicular to the aforementioned axial direction.

In the embodiments of the present invention, "radial force" refers to the force required to deform the medical device in the radial direction. Among them, the smaller the force required to deform the medical device in the radial direction, the smaller the radial force, and the easier it is for the medical device to radially compress or expand toward the central axis; the greater the force required to deform the medical device in the radial direction, The greater the radial force, the harder it is for the medical device to radially compress or expand toward the central axis.

first embodiment

Please refer to Figures 1 to 3, Figure 1 is a schematic structural view of the thrombus removal device provided in the first embodiment of the application capturing thrombus in a human blood vessel; Figure 2 is a natural state of the thrombus removal device provided in the first embodiment of the application Schematic diagram of the cross-sectional structure. Fig. 3 is a schematic cross-sectional structural view of the thrombectomy device provided in the first embodiment of the present application in a compressed state. In Fig. 2 and Fig. 3, the structure of the thrombectomy device has been simplified.

In this embodiment, the thrombectomy device 1 includes a microcatheter 10 , a push-pull wire 20 , a thrombus retriever 30 , a developing ring 40 , and an elastic member 50 . The microcatheter 10 has a hollow tubular structure. The microcatheter 10 accommodates a push-pull wire 20 and a thrombus retriever 30 . The distal end of the push-pull wire 20 is fixedly connected to the proximal end of the thrombus retriever 30 , and the push-pull wire 20 can slide inside the microcatheter 10 and drive the integral thrombus retriever 30 to slide relative to the microcatheter 10 .

In this embodiment, the elastic member 50 protrudes into the thrombus retriever 30 , and the elastic member 50 is in the space surrounded by the thrombus retriever 30 . The distal end of the elastic member 50 is fixedly connected to the distal end of the thrombus remover 30 , and the proximal end of the elastic member 50 is fixedly connected to the proximal end of the thrombus remover 30 . Specifically, as shown in FIG. 2 , the proximal end of the thrombus remover 30 is covered by the proximal end of the elastic member 50 . The developing ring 40 wraps around the outer surface of the proximal end of the thrombus retriever 30 , and fixes the proximal end of the thrombus retriever 30 and the proximal end of the elastic member 50 together. Correspondingly, the distal end of the thrombus remover 30 is covered by the distal end of the elastic member 50 . The developing ring 40 wraps around the outer surface of the distal end of the thrombus retriever 30 , and fixes the distal end of the thrombus retriever 30 and the distal end of the elastic member 50 together. The elastic member 50 is made of metal material. The elastic member 50 extends helically in the axial direction and forms a helical shape to make it elastic.

In this embodiment, the push-pull wire 20 and the elastic member 50 are integrally formed. When the microcatheter 10 slides, the push-pull wire 20 will also drive the elastic member 50 to slide. In other embodiments, the push-pull wire 20 and the elastic member 50 are two different components, and it is enough that the push-pull wire 20 and the elastic member 50 can be fixedly connected.

In this embodiment, when the thrombectomy device 1 is converted from the natural state to the compressed state, the proximal end and the distal end of the thrombectomy device 30 are far away from each other, and the distance between the proximal end and the distal end of the thrombectomy device 30 gradually increases. Large, the whole thrombus remover 30 shrinks in the radial direction, the whole thrombus remover 30 elongates in the axial direction, and the distance between the proximal end and the distal end of the thrombus remover 30 increases, which will make the elastic member 50 deform and move along the axial direction. Stretching, at this time, the elastic member 50 has a restoring force to restore the original shape, and the restoring force can make the distal end and the proximal end of the thrombus retriever 30 approach each other, preventing the axial extension of the thrombus retriever 30 from being too long. 1 to 3, the operation process of this embodiment and the specific function of the elastic member 50 are described as follows:

The microcatheter 10 and the thrombus retriever 30 disposed in the microcatheter 10 are moved to the target position in the blood vessel 100 . The thrombus retriever 30 is exposed outside the microcatheter 10 , so that the thrombus retriever 30 at least partially corresponds to the thrombus 200 on the inner wall of the blood vessel 100 in the radial direction. The thrombus retriever 30 expands under the action of its own radial expansion force. At least part of the outer surface of the thrombus retriever 30 is in contact with the thrombus 200 on the inner wall of the blood vessel 100 , and part of the thrombus 200 is embedded in the thrombus retriever 30 . Then the push-pull wire 20 is operated to withdraw the thrombus retriever 30 to the microcatheter 10 , and at the same time, the thrombus is dragged back into the catheter under the radial expansion force of the thrombus retriever 30 . Under the force of withdrawal of the thrombus retriever 30, the proximal end of the thrombus retriever 30 moves away from the distal end of the thrombus retriever 30, so that the thrombus retriever 30 shrinks, and the restoring force of the elastic member 50 makes the thrombus retriever 30 move The distal end and the proximal end of the thrombus retriever 30 are close to each other, avoiding the distance between the proximal end of the thrombus retriever 30 and the distal end of the thrombus retriever 30 from increasing too much, reducing the shrinkage of the thrombus retriever 30 in the radial direction, It is ensured that the thrombus retriever 30 can closely adhere to the inner wall of the blood vessel 100 , and the success rate of dragging the thrombus 200 into the microcatheter 10 is improved. Moreover, when the thrombus 200 enters the thrombus retriever 30, the helically extended elastic member 50 can increase the contact area with the thrombus 200, restrict the movement of the thrombus 200, prevent the thrombus 200 from falling off, and improve the ability of the thrombus retriever 30 to recover the thrombus.

Please refer to FIG. 3 again, in the compressed state of the thrombus remover 30 , when the elastic member 50 is straightened, the restoring force of the elastic member 50 is the largest. The axial length of the elastic member 50 when straightened is equal to the maximum axial length between the proximal end and the distal end of the thrombus retriever 30 .

Please refer to FIGS. 4 to 6. FIG. 4 is a schematic diagram of the three-dimensional structure of the thrombus remover in the first embodiment of the present application; FIG. 5 is a schematic diagram of the three-dimensional structure of the thrombus retriever in the first embodiment of the present application; A schematic diagram of the deployment of the thrombus retriever in the first embodiment of the present application. In this embodiment, the thrombus remover 30 can be formed by laser cutting a metal tube with shape memory effect and superelasticity (such as a NiTi alloy tube), then molded, and then heat-treated to shape it. Alternatively, the thrombus remover 30 can also be formed by first cutting a metal sheet with shape memory effect and superelasticity, then forming it with a mold, and then heat treatment to shape it. Alternatively, the thrombus remover 30 can also be formed by first weaving metal wires with shape memory effect and superelasticity, and then undergoing mold forming and heat treatment for shaping. Alternatively, the thrombus retriever 30 can also be made of highly elastic polymer materials. Suitable materials mentioned above are well known to those skilled in the art and will not be described in detail here.

In this embodiment, the thrombus retriever 30 adopts a self-expanding stent structure. The thrombus retriever 30 includes a proximal support 31 , a middle support 32 and a distal support 33 arranged in sequence from the proximal end to the distal end. The middle bracket 32 is connected between the proximal bracket 31 and the distal bracket 33 . The middle bracket 32 is located at the middle part of the whole thrombectomy device 30 . In this embodiment, the proximal bracket 31 , the middle bracket 32 and the distal bracket 33 are integrally formed. The proximal bracket 31 is used to support the integral middle bracket 32 and the distal bracket 33 . The middle bracket 32 is used to catch thrombus. The distal support 33 is used to gather the thrombus and prevent the thrombus from falling off. In other embodiments, the proximal bracket 31, the middle bracket 32, and the distal bracket 33 can be different parts, and the bracket that can be fixedly connected to form an integral body between the proximal bracket 31, the middle bracket 32, and the distal bracket 33 shall prevail. .

In this embodiment, the middle bracket 32 includes first connecting rods 324 and second connecting rods 325 arranged at intervals. A proximal end of the first link 324 is connected to the proximal bracket 31 . The distal end of the second link 325 is connected to the distal bracket 33 . The first connecting rod 324 and the second connecting rod 325 extend like a circumferential curve on the peripheral surface of the thrombus retriever 30 . Wherein, the extension of the quasi-circumferential curve refers to the extension along the peripheral surface of the thrombus remover 30, which is similar to the extension of the curve in the circumferential direction, and the direction of the extension of the curve is not parallel to the direction where the longitudinal central axis of the thrombus remover 30 is located. , nor along the circumferential direction of the thrombus retriever 30 . Curvilinear extensions include one or more of arcs, broken lines, straight lines, and the like. With such a design, since the first connecting rod 324 and the second connecting rod 325 extend in a circumferential curve on the peripheral surface of the thrombus remover 30, the distance between the proximal bracket 31 and the distal bracket 33 can be along the first connecting rod. 324 , the second connecting rod 325 bends close to the circumferential direction, so that the thrombus retriever 30 as a whole has a shape similar to a helical extension from the proximal end to the distal end, and improves the bending performance of the thrombus retriever 30 . When the thrombus retriever 30 is in a curved blood vessel, its shape similar to the helical extension can be bent and deformed, and it can well conform to the curved blood vessel. The thrombus retriever 30 can closely fit the inner wall of the curved blood vessel, effectively preventing the thrombus from falling off.

The structures of the proximal bracket 31 , the middle bracket 32 and the distal bracket 32 of the thrombus retriever 30 will be explained in detail below. Referring to FIG. 6 , the proximal bracket 31 includes first support rods 311 and first grid units 312 distributed in sequence. The proximal end of the first support rod 311 converges at the proximal end of the proximal bracket 31 , other parts of the first support rod 311 extend outward, and the distal end of the first support rod is connected to the distal end of the first grid unit 312 . In this embodiment, the first support rod 311 and the first grid unit 312 are integrally formed. The rod width of the first support rod 311 is 0.1mm-0.5mm. Wherein, the rod width refers to the length between the two farthest end points. In this embodiment, the number of first support rods 311 is two, and the two first support rods 311 are distributed symmetrically about the central axis of the thrombus remover 30, so that the external force is evenly distributed through the two first support rods 311. Symmetrically transmitted to the first grid unit 312 and the middle bracket 32 of the thrombus retriever 30 . In other embodiments, the number of the first support rod 311 is one.

Please refer to FIG. 6 and FIG. 7 , FIG. 7 is an enlarged schematic diagram of X in FIG. 6 . The rod width of the first support rod 311 is greater than the rod width of other different positions of the entire thrombus remover 30 , that is, the rod width of the first support rod 311 is the largest. Specifically, the rod width of the first support rod 311 is wider than that of the middle bracket 32 , and the rod width of the first support rod 311 is wider than that of the distal bracket 33 . The stiffness of the first support rod 311 is greater than that of other positions of the thrombus retriever 30. The first support rod 311 is less likely to be deformed than other parts of the thrombus retriever 30. The first support rod 311 is effectively transmitting external forces. While going to other different positions of the thrombus remover 30, the shape can be kept unchanged.

In this embodiment, along the axial direction from the distal end to the proximal end, the width of the first support rod 311 gradually increases, and the greater the stiffness of the first support rod 311 , the more difficult it is to deform. With such a design, the part of the first support rod 311 near the proximal end has greater rigidity and is not easy to bend, so as to prevent the bending of the first support rod 311 from affecting the recovery of the thrombus retriever 30 .

In this embodiment, the first grid unit 312 in the proximal bracket 31 is symmetrical with respect to the central axis of the thrombus retriever 30, and the first grid unit 312 can evenly receive the wires transmitted by the push-pull wire 20 and the first support rod 311. After the proximal stent 31 is released from the microcatheter 10, the radial support force of the proximal stent 31 can be guaranteed. In other embodiments, the first grid unit 312 in the proximal support 31 may not be symmetrical with respect to the central axis of the thrombus remover 30 , as long as the radial support force of the proximal support 31 can be ensured.

As for the middle bracket 32. In this embodiment, the middle bracket 32 includes a first catching part 321 , a second catching part 322 , a third catching part 323 , a first connecting rod 324 , a second connecting rod 325 and a third connecting rod 326 . The first catching part 321 , the second catching part 322 and the third catching part 323 are arranged sequentially from the proximal end to the distal end. The first connecting rod 324 , the third connecting rod 326 and the second connecting rod 325 are arranged sequentially from the proximal end to the distal end. In FIG. 6 , the first catch portion 321 is disposed between two adjacent first grid units 312 in the proximal support 31 .

The proximal end of the first link 324 is fixedly connected to the first grid unit 312 at the distal end of the proximal bracket 31 . In this embodiment, the first link 324 is fixedly connected to the converging portion of the first grid unit 312 at the distal end. In other embodiments, the first connecting rod 324 may also be fixedly connected to the non-converging part of the first net rod unit 312 .

In this embodiment, the distal end of the first link 324 is fixedly connected with the second catch portion 322 . In this embodiment, the number of the first connecting rods 324 is two, and the two first connecting rods 324 are arranged opposite to each other. The proximal end of the third connecting rod 326 is fixedly connected with the second catching part 322 , and the distal end of the third connecting rod 326 is fixedly connected with the third catching part 323 . The proximal end of the second connecting rod 325 is fixedly connected with the third catching part 323 , and the distal end of the second connecting rod 325 is fixedly connected with the distal bracket 33 .

In this embodiment, the projections of the first capturing portion 321 and the second capturing portion 322 on a plane perpendicular to the longitudinal central axis of the thrombus retriever 30 only partially coincide. Moreover, the projections of the distal end of the first capturing portion 321 and the distal end of the second capturing portion on a plane perpendicular to the longitudinal central axis of the thrombus retriever are spaced apart from each other. Such a design enables the thrombus retriever 30 to capture thrombus at different positions on its peripheral surface at the same time, which is convenient to improve the capture effect of the thrombus retriever 30 . Specifically, referring to FIG. 6 , part of the first connecting rod 324 is obliquely bent relative to the positive direction of the X-axis on the peripheral surface of the thrombus retriever 30 . In other embodiments, the first connecting rod 324 can be inclined and bent in other directions on the peripheral surface of the thrombus retriever 30 , so as to improve the capture effect of the thrombus retriever 30 .

In this embodiment, the first connecting rod 324, the third connecting rod 326 and the second connecting rod 325 are arranged at intervals from the proximal end to the distal end in the axial direction. Each of the first connecting rod 324 , the third connecting rod 326 and the second connecting rod 325 is arc-shaped and extends like a circumferential curve on the peripheral surface of the thrombus remover 30 . Among the distal ends of the first catching part 321, the third catching part 323 and the second catching part 322, the distal ends of at least two adjacent catching parts are perpendicular to the The projections on the plane of the longitudinal central axis are spaced apart from each other, so that the thrombus retriever 30 can capture thrombus at different positions on its peripheral surface at the same time, so as to improve the capture effect of the thrombus retriever 30 . In other embodiments, among the distal ends of the first capturing portion 321, the distal end of the third capturing portion 323 and the distal end of the second capturing portion 322, the distal ends of at least two adjacent capturing portions, The projections on the plane perpendicular to the longitudinal central axis of the thrombus retriever are all spaced apart, so that the distal ends of the first catch portion 321, the third catch portion 323 and the second catch portion 322 are further staggered around the thrombus retriever 30. The position on the surface improves the capture effect of the thrombus retriever 30 .

Compared with the case of connecting rods parallel to the axial direction, in this embodiment, the first connecting rod 324, the third connecting rod 326 and the second connecting rod 325 extend like a circumferential curve on the peripheral surface of the thrombus remover 30, so that the first connecting rod 324, the third connecting rod 326 and the second connecting rod 325 One connecting rod 324, the third connecting rod 326 and the second connecting rod 325 have good bending deformation capacity in the axial direction, and the proximal support 31, the middle support 32 and the distal support 33 are easy to bend each other, and the proximal support 31 , the middle stent 32 and the distal stent 33 can fit the curved blood vessel 100 well during the process of passing through the curved blood vessel 100 , so as to prevent the thrombus from being separated from the thrombus retriever 30 because the thrombus retriever 30 does not fit the inner wall of the blood vessel 100 .

Specifically in FIG. 6 , the first connecting rod 324, part of the third connecting rod 326 and part of the second connecting rod 325 are obliquely bent downward along the peripheral surface of the thrombus remover 30 relative to the positive direction of the X-axis. In other embodiments, The first connecting rod 324, the third connecting rod 326, and the second connecting rod 325 can also be obliquely bent on the peripheral surface of the thrombus remover 30 in different or partially the same directions, so that the thrombus remover 30 has better bending performance prevail.

In this embodiment, part of the first connecting rod 324 and part of the third connecting rod 326 are parallel to each other. Part of the first connecting rod 324 and part of the third connecting rod 326 are parallel to each other means that while part of the first connecting rod 324 and part of the third connecting rod 326 are parallel to each other, there are part of the first connecting rod 324 and part of the third connecting rod. Links 326 are not parallel. Specifically, in this embodiment, the third link 326 includes a straight section 3261 and an inclined section 3262 . The inclined section 3262 is parallel or approximately parallel to the first link 324 . The straight section 3261 is not parallel to the first connecting rod 324, but parallel to the X axis. Such a design can increase the distance between the second catching part 322 and the third catching part 323, increase the opening size of the second catching part 322 and the third catching part 323, and facilitate the thrombus from the second catching part. The opening between the catching part 322 and the third catching part 323 enters to improve the performance of the thrombus retriever 30 in catching thrombus.

In this embodiment, part of the first link 324, part of the second link 325, and part of the third link 326 are parallel to each other, so that the proximal bracket 31 and the distal bracket 33 are easy to bend along the same direction extend. Part of the first link 324, part of the second link 325, and part of the third link 326 are parallel to each other, which means that part of the first link 324, part of the second link 325, and part of the third link 326 are parallel to each other, and at least part of the first connecting rod 324 , the second connecting rod 325 , and the third connecting rod 326 are not parallel to each other. In this embodiment, the second connecting rod 325 is arched, and part of the second connecting rod 325 is inclined upward along the positive direction of the X-axis. This part of the second connecting rod 325 is parallel or approximately parallel to the first connecting rod 324 . Such a design can increase the distance between the first catching part 321, the second catching part 322 and the third catching part 323, and increase the distance between the first catching part 321, the second catching part 322 and the third catching part 323. The size of the opening of the capture part 323 is convenient for thrombus to enter through the openings between the first capture part 321 , the second capture part 322 and the third capture part 323 , which improves the performance of the thrombus retriever 30 in capturing thrombus. In other embodiments, part of the first link 324, part of the second link 325, and part of the third link 326 can be close to parallel to each other, so that the proximal bracket 31 and the distal bracket 33 can be easily moved along. Bending and extending in the same direction shall prevail.

There is a virtual connection line on the peripheral surface of the thrombus remover 30 between the distal end of the first connecting rod 324 and the proximal end of the second connecting rod 325, the first connecting rod 324, the virtual connecting line and the second connecting rod 325 A helical line around the longitudinal central axis of the thrombus retriever 30 can be formed, so that the thrombus retriever 30 composed of the proximal support 31 and the distal support 33 can have a shape similar to a helical extension and is easy to bend. In other embodiments, the first connecting rod 324 , the virtual connecting line and the second connecting rod 325 may form a curve around the longitudinal central axis of the thrombus remover 30 which may be similar to a helical shape.

In this embodiment, the number of the first connecting rods 324 is two, and the two first connecting rods 325 are arranged opposite to each other. Correspondingly, the number of each of the second connecting rod 325 and the third connecting rod 326 is two, and they are arranged opposite to each other.

A virtual line exists between one of the first connecting rods 324 and one of the second connecting rods 325 . There is also a virtual connection between another first link 324 and another second link 325 . In this way, the first connecting rod 324, the virtual line between the first connecting rod 324 and the second connecting rod 325, and the second connecting rod 325 form two helical lines around the longitudinal central axis of the thrombus retriever, and the two helical lines Not connected to each other. Two helical lines are formed in the thrombus retriever 30, which can further improve the bending and deformation performance of the thrombus retriever 30 itself, which is easy to bend, better conforms to the curved blood vessel and closely adheres to the inner wall of the curved blood vessel, and effectively prevents the thrombus from falling off. In other implementations, the thrombus retriever 30 may also only form a helix, so that the thrombus retriever 30 can be bent and deformed along the helical direction of the helix. In other embodiments, the thrombus retriever 30 can form three or more helical wires, specifically, the effect that the thrombus retriever 30 can be easily bent and closely fit the inner wall of the blood vessel shall prevail.

In this embodiment, there is a first virtual line 327 on the peripheral surface of the thrombus remover 30 between the distal end of the first connecting rod 324 and the proximal end of the third connecting rod 326, and the distal end of the third connecting rod 326 There is also a second virtual line 328 on the peripheral surface of the thrombus remover 30 between the proximal end of the second connecting rod 325, the first connecting rod 324, the first virtual connecting line 327, the third connecting rod 326, the second The virtual connecting line 328 and the second connecting rod 325 can form a helix around the longitudinal central axis of the thrombus remover 30 . With such a design, the thrombus remover 30 composed of the proximal support 31 , the middle support 32 , and the distal support 33 can have a shape similar to a helical extension and is easy to bend.

In other embodiments, the middle bracket 32 may only include the first connecting rod 324 and the second connecting rod 325 , as long as the thrombus remover 30 can fit the curved blood vessel 1000 well.

The shape of the first link 324 , the shape of the second link 325 , and the shape of the third link 326 are described below. In this embodiment, the first connecting rod 324 as a whole is inclined downward relative to the positive direction of the X-axis. A portion of the second link 325 is inclined downward relative to the positive direction of the X-axis. A portion of the second link 325 inclined relative to the positive direction of the X-axis is parallel or approximately parallel to the first link 324 . The shape of the second link 325 is partially the same as that of the first link 324 . The second connecting rod 325 is arched, part of the second connecting rod 325 is inclined upward along the positive direction of the X-axis, and this part of the second connecting rod 325 is parallel or approximately parallel to the first connecting rod 324 . Another part of the second link 325 is inclined downward along the positive direction of the X-axis.

The third link 326 includes a straight section 3261 and an inclined section 3262 . The proximal end of the straight section 3261 is fixedly connected with the second catching part 322 , the distal end of the straight section 3261 is fixedly connected with the proximal end of the inclined section 3262 , and the distal end of the inclined section 3262 is fixedly connected with the third catching part 323 . The inclined section 3262 is parallel or approximately parallel to the first connecting rod 324, and the extension direction of the straight section 3261 is parallel to the X axis, which can increase the distance between the second catching part 322 and the third catching part 323, and increase the distance between the second catching part 322 and the third catching part 323. The size of the openings of the second capture part 322 and the third capture part 323 is convenient for thrombus to enter through the opening between the second capture part 322 and the third capture part 323 , improving the performance of the thrombus retriever 30 in capturing thrombus.

The shapes of the first connecting rod 324, the second connecting rod 325, and the third connecting rod 326 are partly the same, which is convenient for arranging the positions of the proximal support 31, the middle support 32 and the distal support 33, so that the thrombus remover 30 as a whole can While having good bending performance, the arrangement of the overall structure of the thrombus remover 30 is ensured. In other embodiments, the shapes of the first connecting rod 324, the second connecting rod 325 and the third connecting rod 326 can be the same, and the first connecting rod 324, the second connecting rod 325 and the third connecting rod 326 can be integrated into one another. The embolus 30 has a tendency to extend helically in the circumferential direction and has better bending performance.

Please refer to FIG. 6 and FIG. 8 , FIG. 8 is an enlarged schematic view of XX in FIG. 6 . When other conditions remain the same, the rod width at the proximal end of the first connecting rod 324 is greater than the rod width at the middle part of the first connecting rod 324, which can improve the strength of the first connecting rod 324 at the proximal end, making the first connecting rod 324 The proximal end is less prone to breaking than the middle portion of the first link 324 . The rod width of the distal end of the first connecting rod 324 is also greater than that of the middle part of the first connecting rod 324, and the distal end of the first connecting rod 324 is more difficult to break. Correspondingly, the second connecting rod 325 and the third connecting rod 326 also have similar settings, which will not be repeated here.

In this embodiment, the proximal end of the first connecting rod 324 is rounded to avoid stress concentration at the proximal end of the first connecting rod 324 and easy breakage. The distal end of the first connecting rod 324 , the proximal and distal ends of the second connecting rod 325 , and the proximal and distal ends of the third connecting rod 326 are also provided with rounded corners.

Please refer to Fig. 6 again, the rod width of the first connecting rod 324, the rod width of the second connecting rod 325 and the rod width of the third connecting rod 326 are all greater than the rod width of the net rod in the distal support 33, and the first connecting rod 324, the bar width of the second link 325 and the bar width of the third link 326 are less than the bar width of the first support bar 311 in the proximal support 31, so that the first link 324, the second link The strength of the rod 325 and the third connecting rod 326 is greater than the strength of the net rod in the distal support 33, and is less than the strength of the first support rod 311, so that the first connecting rod 324, the second connecting rod 325 and the third connecting rod 326 While easy to bend and deform, it has good strength and is not easy to break.

The first capturing part 321 , the second capturing part 322 and the third capturing part 323 will be described below. Please refer to FIG. 4 to FIG. 6 again, the first catching part 321 includes a first sub-catching part 3211 and a second sub-catching part 3212 arranged at intervals. The first sub-catching part 3211 and the second sub-catching part 3212 respectively include two net rods, the proximal ends of the two net rods are respectively connected to the net rod parts of the adjacent first net rod unit, and the far ends of the two net rods are connected to each other. The ends converge together, and the part where the far ends of the two mesh rods converge is suspended in the air. When the thrombus remover 30 is released in the blood vessel, the thrombus remover 30 will be squeezed by the blood vessel 100, and the proximal parts of the two mesh rods will be radially compressed, so that the part where the distal ends of the two mesh rods converge will expand outward, which is convenient for the first The catch portion captures the thrombus. Correspondingly, the second catching part 322 and the third catching part 323 are similar in shape to the first catching part 321 . The second catching part 322 and the third catching part 323 respectively include two catching parts, and each catching part is surrounded by two net rods. The near ends of these net rods are fixedly connected with the net rod units in the middle support 32; the part where the far ends of the net rods converge is suspended.

In this embodiment, the projection of the first sub-capturing part 3211 and the second sub-capturing part 3212 in the first capturing part 321 partially overlaps on at least one plane including the longitudinal central axis of the thrombus retriever 30 . Specifically, part of the first sub-grabbing part 3211 is aligned with part of the second sub-catching part 3212, and the distance from the distal end of the first sub-grabbing part 3211 to the proximal end of the thrombus retriever 30 is greater than that of the second sub-catching part 3212 The distance from the distal end to the proximal end of the thrombus retriever 30. During the recovery of the first capture part 321 into the microcatheter 10, the two opposite capture parts are compressed into the microcatheter 10 and will not overlap with each other, reducing the compression of the first capture part 321 into the microcatheter 10. The thickness of the medium is convenient for the first catch portion 321 to be withdrawn into the microcatheter 10 . Correspondingly, the two catching pieces in the second catching part 322 and the two catching pieces in the third catching part 323 respectively also have similar shapes to the two catching pieces in the first catching part 321, The second catching part 322 and the third catching part 323 are convenient for entering the microcatheter 10 .

In this embodiment, the distal end of the first catch part 321 is wound with a developing point, and the distal end of the third catch part 323 is also wrapped with a developing point respectively. In other embodiments, the distal end of the second catch portion 322 may also be wrapped with a developing point.

The structure of the distal bracket 33 will be described below. The distal support 33 includes a plurality of uniformly arranged grid units. When the thrombus retriever 30 is unfolded, the grid units are approximately in the shape of a rhombus, and adjacent grid units are connected to each other. The opening of the grid unit of the distal support 33 is smaller than the opening of the grid unit in the middle support, and the distal support 33 can intercept and accommodate the thrombus in the thrombus retriever 30 to prevent the thrombus from falling off.

second embodiment

Please refer to FIG. 9 and FIG. 10 . FIG. 9 is a schematic cross-sectional view of the thrombus retrieval device provided in the second embodiment of the present application; FIG. 10 is a schematic cross-sectional view of the thrombus retrieval device in the second embodiment of the present application. The thrombus removing device 1a provided by this embodiment is basically the same as that of the first embodiment, except that in this embodiment, the elastic member 50a and the push-pull wire 20a are not integrally formed. The elastic member 50a has elasticity and is formed of polymer material. The proximal end of the elastic member 50a is fixedly connected with the distal end of the push-pull wire 20a. Specifically, the distal end of the push-pull wire 20a is provided with a fixing ring 21a, and the elastic member 50a is fixedly connected with the fixing ring 21a. Specifically, the elastic member 50a is wound and bound together with the fixing ring 21a.

In this embodiment, the thrombectomy device 1a further includes a connecting ring 60a. The distal end of the connecting ring 60a is fixedly connected with the distal end of the thrombus retriever 30a. Specifically, the elastic member 50a is wound and bound together with the connecting ring 60a. In this embodiment, the elastic member 50a can pass through the opening of the connecting ring 30a, and be bound and fixed on the connecting ring 60a. Since the elastic member 50a is elastic, there is no need to form a helical structure in the axial direction to ensure the elasticity of the elastic member 50a. This arrangement can reduce the density of components in the radial direction of the thrombus retriever and make it easier to insert into the sheath.

third embodiment

Please refer to FIG. 11 and FIG. 12 . FIG. 11 is a schematic cross-sectional view of the thrombus removing device 1 b provided in the third embodiment of the present application; FIG. 12 is a schematic view of the elastic member in the third embodiment of the present application. The thrombus removing device 1b provided in this embodiment is basically the same as the first embodiment, except that in this embodiment, the elastic member 50b includes a flat section 51b and a helical section 52b connected to the flat section 51b. In the axial direction, the flat section 51a is opposite to the catch portion 320b of the middle bracket 32b. Specifically, the catching part 320b includes a first catching part 321b, a second catching part 322b, and a third catching part 323b. The flat section 51a corresponds to the first catching part 321b, the second catching part 322b, and the third catching part 323b of the thrombus retriever respectively. The flat section 51a is straight and extends in the axial direction, which can avoid mutual interference with the first catching part 321b, the second catching part 322b and the third catching part 23b, and prevent the flat section 51a from being wrapped around the first catching part 321b. The first catching part 321b, the second catching part 322b and the third catching part 23b affect the deployment of the thrombus retriever in the blood vessel. In other embodiments, the capture part 320b may only include the first capture part 321b, or only include the first capture part 321b and the second capture part 322b, so that the capture part 320b can realize the function of capturing thrombus as allow.

In this embodiment, the plurality of helical segments 52b correspond to the proximal bracket 31b and the distal bracket 33b respectively. The plurality of helical segments 52b have a restoring force to restore the original shape after being stretched in the axial direction, so as to ensure the elasticity of the whole elastic member 50b. At the same time, the plurality of helical segments 52b can increase the contact area with the thrombus and prevent the thrombus from falling off.

In this embodiment, the flat section 51b is connected between two adjacent helical sections 51b, so that after the thrombus enters the part corresponding to the flat section 51b in the thrombus retriever 30b, it is blocked by the adjacent helical section 52b and is not easy to move. Improve the thrombus remover 30b to prevent the effect of falling off.

Fourth embodiment

Please refer to FIG. 13 and FIG. 14 . FIG. 13 is a schematic cross-sectional view of the thrombus retrieval device provided in the fourth embodiment of the present application; FIG. 14 is a schematic cross-sectional view of the thrombus retrieval device in the fourth embodiment of the present application. The thrombus removing device 1c provided in this embodiment is basically the same as that in the first embodiment, except that in this embodiment, the elastic member 50c includes a main body 51c and a plurality of piercing members 52c fixedly connected to the main body 51c. The main body 51c extends in the axial direction. A plurality of piercing elements 52c are arranged at intervals on the main body 51c, and distributed alternately in the circumferential direction. During the process of capturing the thrombus, the single piercing member 52c can pierce the thrombus to fix the thrombus and prevent the thrombus from falling out of the thrombus retriever 30c. Moreover, multiple piercing elements 52c can increase the contact area between the elastic element and the thrombus, and multiple adjacent piercing elements 52c can clamp the thrombus with each other, further improving the effect of preventing the thrombus from falling off.

In this embodiment, the angle between each piercing member 52c and the axial direction of the main body 51c is an acute angle. Referring to FIG. 13 , the extending direction of the main body is parallel to the extending direction of the X-axis. The angle between each piercing member 52c and the axial direction of the main body is an acute angle, which is the same as the angle between each piercing member 52c and the positive direction of the X-axis. When the thrombus retriever 30c is compressed into the microcatheter 10c, the puncture part 52c can approach the main body 51c in a clockwise direction based on the connection point with the main body 51c, so as to smoothly enter the microcatheter 10c and ensure the smooth recovery of the microcatheter 10c Thrombus and thrombus retriever 30c. If the included angle between the piercing piece 52c and the positive direction of the X-axis is obtuse, the piercing piece 52c is likely to abut against the inner wall of the microcatheter 10c or be stuck at the nozzle of the microcatheter 10c to prevent the thrombus remover 30c from entering the microcatheter.

fifth embodiment

Please refer to Fig. 15 to Fig. 17, Fig. 15 is a schematic cross-sectional view of the thrombus remover in the thrombectomy device provided by the fifth embodiment of the present application; Fig. 16 is a cross-sectional view of the puncture member in the thrombus removal device provided by the fifth embodiment of the present application ; FIG. 17 is a cross-sectional view at another angle of the piercing member in the thrombectomy device provided by the fifth embodiment of the present application. The thrombus removing device 1d provided in this embodiment is basically the same as the fourth embodiment, the difference is that in this embodiment, the piercing member 52d is sleeved on the outer surface of the main body 51d. Specifically, the puncture member 52d is covered on the outer surface of the main body 51d through its own opening, and then the puncture member 52d is compressed to reduce the opening of the puncture member 52d to prevent the puncture member 52d from falling off.

In this embodiment, the main body 51d is provided with a receiving groove 53d. Part of the piercing member 52d is accommodated in the receiving groove 53d, and part of the piercing member 52d is limited by the inner wall of the receiving groove 53d in the axial direction, so that the piercing member 52d can only rotate around the outer surface of the main body 51d. The puncture part 52d can increase the contact area with the thrombus, improve the effect of capturing the thrombus and preventing the thrombus from falling off, and the puncture part 52d can rotate following the curvature of the blood vessel to avoid stabbing the inner wall of the blood vessel.

Sixth embodiment

Please refer to FIG. 18 . FIG. 18 is a schematic cross-sectional view of the thrombus retriever provided in the sixth embodiment of the present application; FIG. 19 is a schematic structural view of the elastic member in the thrombus retrieval device provided in the sixth embodiment of the present application. The thrombectomy device 1e provided in this embodiment is basically the same as the first embodiment, the difference is that in this embodiment, in this embodiment, the elastic member 50e includes a first helical wire 51e and a second helical wire 52e, the first helical wire 51e The helical wire 51e and the second helical wire 52e extend around each other. The proximal end of the first helical wire 51e is closely attached to the proximal end of the second helical wire 52e, and after being wound, it is fixedly connected with the distal end of the push-pull wire 20e and the proximal end of the thrombus retriever 30e. In a natural state, the distal end of the first helical wire 51e is closely attached to the distal end of the second helical wire 52e, and after being wound, it is fixedly connected to the distal end of the thrombus retriever 30e. The main body portion of the first helix 51e (except the proximal end of the first helix and the distal end of the first helix), and the main body portion of the second helix 52e (except the proximal end of the second helix and the second helix) The distal part of the helix) extends spirally with each other in the axial direction, and there is a gap between them, and jointly encloses a receiving space.

During the thrombus removal process, the elastic member can not only limit the axial extension of the thrombus remover 30e from being too long, but also increase the contact area with the thrombus during the thrombus removal process, so that part of the thrombus can be embedded in the first helix The accommodation space between 51e and the second helical thread 52e prevents the thrombus from being easily separated due to the resistance of the first helical thread 51e and the second helical thread 52e, preventing the thrombus from falling off.

Please refer to FIG. 20 . FIG. 20 is a schematic structural diagram of the elastic member in the thrombectomy device provided by the seventh embodiment of the present application. The thrombectomy device in this embodiment is basically the same as that in the sixth embodiment. The difference is that the elastic member 50e includes a plurality of helical wires 53e. Multiple refers to three or more. The proximal ends of the plurality of helical wires 53e are tightly wound and fixedly connected with the distal ends of the push-pull wires 20e. The distal ends of the plurality of helical wires 53e are tightly wound and fixedly connected with the distal end of the thrombus retriever 30e. The plurality of helical wires 53e include a main body part connected to its proximal end and its distal end. The main parts are all accommodated inside the thrombus remover 30e, and extend helically and interlaced with each other to enclose a receiving space 54e. The thrombus entering the receiving space 54e is limited by the plurality of limiting helical wires 53e and is difficult to escape. Moreover, the plurality of helical wires 53e cooperate with the thrombus retriever 30e, and the thrombus is stuck between the thrombus retriever 30e and the plurality of helical wires 53e, effectively preventing the thrombus from falling off.

The technical features of the above-mentioned embodiments can be combined arbitrarily. To make the description concise, all possible combinations of the technical features in the above-mentioned embodiments are not described. However, as long as there is no contradiction in the combination of these technical features, should be considered as within the scope of this specification.

The above-mentioned embodiments only express several implementation modes of the present invention, and the descriptions thereof are relatively specific and detailed, but should not be construed as limiting the patent scope of the invention. It should be pointed out that those skilled in the art can make several modifications and improvements without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent for the present invention should be based on the appended claims.

Claims

A thrombus removal device, characterized in that the thrombus removal device includes a thrombus remover and an elastic member, the elastic member is arranged in the space surrounded by the thrombus remover, the proximal end of the elastic member is connected to the The proximal end of the thrombus retriever is fixedly connected, the distal end of the elastic member is fixedly connected with the distal end of the thrombus retriever, the elastic member is elastic, and when the thrombus retriever is in a compressed state, the elastic member The distal end of the retriever and the proximal end of the retriever may be brought into close proximity to each other.
The thrombectomy device according to claim 1, characterized in that, in a natural state, the elastic member extends helically in the axial direction.
The thrombus retrieval device according to claim 1, characterized in that, the thrombus retriever includes a catching part, the catching part is used to catch thrombus, and the elastic member includes a flat section, and the flat section is connected to the thrombus. The arrest part is facing.
The thrombectomy device according to claim 1, wherein the elastic member comprises a main body and a piercing member connected to the main body, and the piercing member can penetrate thrombus.
The thrombectomy device according to claim 4, wherein the angle between the piercing member and the main body bracket is an acute angle.
The thrombectomy device according to claim 4, wherein the piercing member is fixedly connected to the outer surface of the main body.
The thrombus removing device according to claim 4, wherein the piercing member is sleeved on the outer surface of the main body, and the piercing member can rotate around the main body.
The thrombectomy device according to claim 1, wherein the elastic member comprises two or more helical wires, and the helical wires extend helically with each other in the axial direction.
The thrombectomy device according to claim 8, wherein the proximal ends of the two or more helical wires are closely attached and fixedly connected with the proximal ends of the thrombus retriever, and the two or more The distal end of the above helical wire fits tightly and is fixedly connected with the distal end of the thrombus retriever.
The thrombectomy device according to claim 8 or 9, characterized in that, in a natural state, a storage space is enclosed between the two or more helical wires.
A thrombus retrieval device, characterized in that, the thrombus retrieval device includes a thrombus retriever, and the thrombus retriever includes a proximal bracket, a middle bracket and a distal bracket arranged sequentially from the proximal end to the distal end, and the middle bracket It includes a first connecting rod and a second connecting rod arranged at intervals, the proximal end of the first connecting rod is connected to the proximal support, and the distal end of the second connecting rod is connected to the distal support. The first connecting rod and the second connecting rod extend like a circumferential curve on the peripheral surface of the thrombus retriever.
The thrombectomy device according to claim 11, wherein there is a virtual connection between the distal end of the first connecting rod and the proximal end of the second connecting rod on the peripheral surface of the thrombus removing device. line, the first connecting rod, the virtual connecting line and the second connecting rod may form a helix around the longitudinal central axis of the thrombus retriever.
The thrombus removing device according to claim 11, wherein the number of the first connecting rods is two, the number of the second connecting rods is two, one of the first connecting rods and one of the There is a virtual connection line between the second connecting rods, and there is also a virtual connecting line between the other first connecting rod and the other second connecting rod. The first connecting rod, the first connecting rod A virtual line between the first connecting rod and the second connecting rod, the second connecting rod forms two helical lines around the longitudinal central axis of the thrombus retriever, and the two helical lines are not connected to each other.
The thrombectomy device according to claim 11, wherein the middle support includes a first catch part, and the first catch part and the first connecting rod are on the peripheral surface of the thrombus remover Arranged adjacently, the proximal end of the first catching part is fixedly connected with the proximal bracket, and the distal end of the first catching part is suspended.
The thrombectomy device according to claim 14, wherein the first catch part comprises a first sub-grasp and a second sub-grasp, and the first sub-grasp and the second sub-grasp The sub-grabbing parts are arranged at intervals on the peripheral surface of the thrombus retriever, the first connecting rod is arranged between the first sub-grabbing part and the second sub-catching part, and the first sub-catching part The catch part and the second sub catch part partially overlap on the projection of at least one plane including the longitudinal central axis of the thrombus retriever.
The thrombectomy device according to claim 14, characterized in that, the middle support further comprises a second catch part, and the second catch part and the first catch part are sequentially arranged from the proximal end to the distal end , the proximal end of the second catching part is fixedly connected to the distal end of the first connecting rod, the distal end of the second catching part is suspended, the distal end of the second catching part and the first connecting rod The projections of the distal ends of a capture portion on a plane perpendicular to the longitudinal central axis of the thrombus retriever are spaced apart from each other.
The thrombectomy device according to claim 16, wherein the middle bracket further comprises a third catch part, the distal end of the third catch part is suspended, and the first catch part, the third catch part The catching part and the second catching part are arranged sequentially from the proximal end to the distal end, the proximal end of the third catching part is connected to the first connecting rod, and the distal end of the third catching part is connected to the The second connecting rods are adjacent, and at least two of the distal ends of the first catching part, the third catching part and the second catching part are adjacent to each other in a vertical direction. The projections on the plane including the longitudinal central axis of the thrombus retriever are spaced apart from each other.
The thrombectomy device according to claim 11, wherein the middle support further comprises a third connecting rod, the third connecting rod is connected between the first connecting rod and the second connecting rod, The third connecting rod extends like a circumferential curve on the peripheral surface of the thrombus retriever.
The thrombectomy device according to claim 18, wherein there is a first virtual space between the distal end of the first connecting rod and the proximal end of the third connecting rod on the peripheral surface of the thrombus removing device. There is also a second virtual connecting line on the peripheral surface of the thrombus retriever between the distal end of the third connecting rod and the proximal end of the second connecting rod, the first connecting rod, the The first virtual line, the third connecting rod, the second virtual connecting line, and the second connecting rod may form a helical line around the longitudinal central axis of the thrombus retriever.
The thrombus removing device according to claim 11, wherein a part of the first connecting rod and a part of the second connecting rod are parallel to each other.