Thrombectomy device

Abstract

The application relates to a thrombus taking device. The thrombus taking device comprises a proximal support, a middle support and a distal support arranged in sequence from a proximal end to a distal end, the middle support comprises first connecting rods and second connecting rods arranged at intervals, the proximal end of the first connecting rod is connected with the proximal support, the distal end of the second connecting rod is connected with the distal support, and the first connecting rod and the second connecting rod extend in a circumferential curve on the circumferential surface of the thrombus taking device. The thrombus taking device provided by the application is characterized in that the first connecting rod and the second connecting rod extend in a circumferential curve on the circumferential surface of the thrombus taking device, so that the proximal support and the distal support can be bent and close to each other along the circumferential direction of the first connecting rod and the second connecting rod, the thrombus taking device has a shape similar to helical extension from the proximal end to the distal end, and the bending performance of the thrombus taking device is improved. When the thrombus taking device is in a curved blood vessel, the shape similar to helical extension can be bent and deformed, well conforms to the curved blood vessel, the thrombus taking device 30 can be closely attached to the inner wall of the curved blood vessel, and thrombus shedding is effectively prevented.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of medical devices, in particular to a thrombectomy device. BACKGROUND

[0002] Acute ischemic stroke (AIS, commonly known as cerebral infarction) is a neurologic injury caused by ischemic necrosis of local brain tissue due to sudden occlusion of cerebral blood flow. Acute ischemic stroke is the most common type of stroke and is the leading cause of death and disability in the elderly. In particular, acute stroke caused by large vessel occlusion is dangerous, with high mortality and disability rate. Once a stroke occurs, it causes great physical and mental harm to the patient and a heavy burden on the patient's family and society.

[0003] Currently, the clinical treatment of ischemic stroke mainly uses mechanical thrombectomy. Mechanical thrombectomy is to deliver a thrombectomy device to the lesion site, and use the thrombectomy device to capture and remove the thrombus outside the body. However, the current thrombectomy device has poor bending performance, and in the curved part of the human blood vessel, the thrombectomy device cannot closely adhere to the inner wall of the blood vessel, so that the thrombus is easily detached. SUMMARY

[0004] Therefore, it is necessary to provide a thrombectomy device that can well conform to the curved blood vessel, closely adhere to the inner wall of the curved blood vessel, and effectively prevent the thrombus from detaching.

[0005] The thrombectomy device comprises a thrombectomy device, the thrombectomy device comprises a proximal support, a middle support and a distal support arranged in sequence from the proximal end to the distal end, the middle support comprises first connecting rods and second connecting rods arranged at intervals, the proximal end of the first connecting rod is connected with the proximal support, the distal end of the second connecting rod is connected with the distal support, and the first connecting rod and the second connecting rod extend in a circumferential curve on the circumferential surface of the thrombectomy device.

[0006] There is a virtual connecting line between the distal end of the first connecting rod and the proximal end of the second connecting rod on the circumferential surface of the thrombectomy device, and the first connecting rod, the virtual connecting line and the second connecting rod can form a spiral line around the longitudinal center axis of the thrombectomy device.

[0007] The number of first connecting rods is two, and the number of second connecting rods is two, wherein there is a virtual connecting line between one of the first connecting rods and one of the second connecting rods, and there is also a virtual connecting line between the other first connecting rod and the other second connecting rod, and the first connecting rod, the virtual connecting line between the first connecting rod and the second connecting rod, and the second connecting rod form two spiral lines around the longitudinal center axis of the thrombectomy device, and the two spiral lines are not connected to each other.

[0008] The middle support comprises a first catching portion, the first catching portion is arranged adjacent to the first connecting rod on the peripheral surface of the vaso-occlusive device, the proximal end of the first catching portion is fixedly connected with the proximal support, and the distal end of the first catching portion is suspended.

[0009] The first catching portion comprises a first sub-catching member and a second sub-catching member, the first sub-catching member and the second sub-catching member are arranged at intervals on the peripheral surface of the vaso-occlusive device, and the first connecting rod is arranged between the first sub-catching member and the second sub-catching member.

[0010] The middle support further comprises a second catching portion, the second catching portion is arranged sequentially from the proximal end to the distal end with the first catching portion, the proximal end of the second catching portion is fixedly connected with the distal end of the first connecting rod, the distal end of the second catching portion is suspended, and the distal end of the second catching portion and the distal end of the first catching portion are spaced apart on the projection perpendicular to the plane containing the longitudinal central axis of the vaso-occlusive device.

[0011] The middle support further comprises a third catching portion, the distal end of the third catching portion is suspended, the first catching portion, the third catching portion and the second catching portion are arranged sequentially from the proximal end to the distal end, the proximal end of the third catching portion is connected with the first connecting rod, the distal end of the third catching portion is adjacent to the second connecting rod, and at least two adjacent ones of the distal end of the first catching portion, the distal end of the third catching portion and the distal end of the second catching portion are spaced apart on the projection perpendicular to the plane containing the longitudinal central axis of the vaso-occlusive device.

[0012] 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, and the first connecting rod, the third connecting rod and the second connecting rod extend along a circumferential curve on the peripheral surface of the vaso-occlusive device.

[0013] There is a first virtual connecting line between the distal end of the first connecting rod and the proximal end of the third connecting rod on the peripheral surface of the vaso-occlusive device, and there is also a second virtual connecting line between the distal end of the third connecting rod and the proximal end of the second connecting rod on the peripheral surface of the vaso-occlusive device, and the first connecting rod, the first virtual connecting line, the third connecting rod, the second virtual connecting line and the second connecting rod can form a spiral line around the longitudinal central axis of the vaso-occlusive device.

[0014] Part of the first connecting rod and part of the second connecting rod are parallel to each other.

[0015] The thrombus taking device provided by the application, since the first connecting rod and the second connecting rod extend in a circumferential curve on the peripheral surface of the thrombus taker, the proximal support and the distal support can be bent close to each other along the circumferential direction of the first connecting rod and the second connecting rod, so that the thrombus taker has a shape similar to a spiral extension from the proximal end to the distal end, improving the bending performance of the thrombus taker. When the thrombus taker is in a curved blood vessel, its shape similar to a spiral extension can be bent and deformed, well conforming to the curved blood vessel, and the thrombus taker can closely fit the inner wall of the curved blood vessel, effectively preventing the thrombus from falling off. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 For Figure 1 The structure diagram of the thrombus taking device provided by the first embodiment of the application in capturing a thrombus in a human blood vessel.

[0017] Figure 2 The cross-sectional structure diagram of the thrombus taking device provided by the first embodiment of the application in a natural state.

[0018] Figure 3 The cross-sectional structure diagram of the thrombus taking device provided by the first embodiment of the application in a compressed state.

[0019] Figure 4 The three-dimensional structure diagram of the thrombus taker in the first embodiment of the application.

[0020] Figure 5 The three-dimensional structure diagram of the thrombus taker in the first embodiment of the application from another angle.

[0021] Figure 6 The expansion diagram of the thrombus taker in the first embodiment of the application.

[0022] Figure 7 For Figure 6 The enlarged diagram of X in FIG. 5.

[0023] Figure 8 For Figure 6 The enlarged diagram of XX in FIG. 6.

[0024] Figure 9 The cross-sectional diagram of the thrombus taking device provided by the second embodiment of the application.

[0025] Figure 10 The cross-sectional diagram of the thrombus taker in the second embodiment of the application.

[0026] Figure 11 The cross-sectional diagram of the thrombus taking device provided by the third embodiment of the application.

[0027] Figure 12 The diagram of the elastic member in the third embodiment of the application.

[0028] Figure 13 A cross-sectional view of the plug taking device according to the fourth embodiment of the present application.

[0029] Figure 14 A cross-sectional view of the plug taking device according to the fourth embodiment of the present application.

[0030] Figure 15 A cross-sectional view of the plug taking device according to the fourth embodiment of the present application.

[0031] Figure 15a A cross-sectional view of the plug taking device according to the fourth embodiment of the present application. Figure 15 An enlarged view of the structure at I in the fifth embodiment of the present application.

[0032] Figure 16 A cross-sectional view of the plug taking device according to the fifth embodiment of the present application.

[0033] Figure 17 A cross-sectional view of the plug taking device according to the fifth embodiment of the present application.

[0034] Figure 18 A cross-sectional view of the plug taking device according to the sixth embodiment of the present application.

[0035] Figure 19 A cross-sectional view of the plug taking device according to the sixth embodiment of the present application.

[0036] Figure 20 A cross-sectional view of the plug taking device according to the sixth embodiment of the present application. DETAILED DESCRIPTION

[0037] In order to make the above objectives, features and advantages of the present application more clear and comprehensible, the specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. In the following description, a lot of specific details are set forth in order to provide a thorough understanding of the present application. However, the present application can be implemented in many different ways other than those described herein, and one of ordinary skill in the art can make similar improvements without departing from the scope of the present application, and therefore the present application is not limited to the specific embodiments disclosed below.

[0038] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs. The terminology used in the description of the present application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the present application.

[0039] In the field of interventional medical devices, the "distal" end is defined as the end of the device that is further from the operator during a procedure, and the "proximal" end is defined as the end of the device that is closer to the operator during a procedure. The "axial" direction refers to the direction parallel to the line connecting the centers of the distal and proximal ends of the medical device, and the "radial" direction refers to the direction perpendicular to the axial direction.

[0040] In the embodiments of the present application, the "radial force" refers to the force required to deform the radial direction of the medical device. The smaller the force required to deform the radial direction of the medical device, the smaller the radial force, and the easier the medical device is to be compressed or expanded radially towards the central axis; the greater the force required to deform the radial direction of the medical device, the greater the radial force, and the more difficult the medical device is to be compressed or expanded radially towards the central axis.

[0041] First embodiment

[0042] Please refer to Figures 1 to 3 , Figure 1 The structure schematic diagram of the thrombus extraction device provided in the first embodiment of the present application captures the thrombus in the human body blood vessel; Figure 2 The structure schematic diagram of the thrombus extraction device provided in the first embodiment of the present application in the natural state. Figure 3 The structure schematic diagram of the thrombus extraction device provided in the first embodiment of the present application in the compressed state. In this embodiment, Figure 2 and Figure 3 The structure of the thrombus extraction device in the above-mentioned

[0043] In this embodiment, the thrombus extraction device 1 includes a microcatheter 10, a push-pull wire 20, a thrombus extractor 30, a developing ring 40, and an elastic member 50. The microcatheter 10 has a hollow tubular structure, and the microcatheter 10 contains the push-pull wire 20 and the thrombus extractor 30. The microcatheter 10 is used to transport the thrombus extractor 30 to the thrombus 200 in the blood vessel 100 and release the thrombus extractor 30. The distal end of the push-pull wire 20 is fixedly connected to the proximal end of the thrombus extractor 30. The push-pull wire 20 can slide inside the microcatheter 10 and drive the whole thrombus extractor 30 to slide relative to the microcatheter 10.

[0044] Please refer to Figures 4 to 6 , Figure 4 The three-dimensional structure schematic diagram of the thrombus extractor in the first embodiment of the present application; Figure 5 The three-dimensional structure schematic diagram of the thrombus extractor in the first embodiment of the present application from another angle; Figure 6 The unfolding schematic diagram of the thrombus extractor in the first embodiment of the present application. In this embodiment, the thrombus extractor 30 can be first cut from a metal pipe material (such as a NiTi alloy pipe) having shape memory effect and super-elasticity by laser, then molded by a mold, and then shaped by heat treatment. Alternatively, the thrombus extractor 30 can be first cut from a metal sheet material having shape memory effect and super-elasticity, then molded by a mold, and then shaped by heat treatment. Alternatively, the thrombus extractor 30 can be first woven from a metal wire having shape memory effect and super-elasticity, then molded by a mold, and then shaped by heat treatment. Alternatively, the thrombus extractor 30 can be made of a high-elastic high-polymer material. The above-mentioned suitable materials are well known to those skilled in the art, and will not be described in detail here.

[0045] In the embodiment, the plugger 30 adopts a self-expanding stent structure. The plugger 30 comprises a proximal stent 31, a middle stent 32 and a distal stent 33 arranged in sequence from the proximal end to the distal end. The middle stent 32 is connected between the proximal stent 31 and the distal stent 33. The middle stent 32 is located in the middle part of the whole plugger 30. In the embodiment, the proximal stent 31, the middle stent 32 and the distal stent 33 are integrally formed. The proximal stent 31 is used to support the whole middle stent 32 and the distal stent 33. The middle stent 32 is used to capture the thrombus. The distal stent 33 is used to gather the thrombus and prevent the thrombus from falling off. In other embodiments, the proximal stent 31, the middle stent 32 and the distal stent 33 can be different components, as long as the proximal stent 31, the middle stent 32 and the distal stent 33 can be fixedly connected to form a whole stent.

[0046] In the embodiment, the middle stent 32 comprises first connecting rods 324 and second connecting rods 325 arranged at intervals. The proximal end of the first connecting rod 324 is connected with the proximal stent 31. The distal end of the second connecting rod 325 is connected with the distal stent 33. The first connecting rod 324 and the second connecting rod 325 extend in a circumferential curve on the circumferential surface of the plugger 30. The circumferential curve extension means that the curve extends along the circumferential surface of the plugger 30, similar to the circumferential direction, and the direction of the curve extension is not parallel to the direction of the longitudinal central axis of the plugger 30, nor along the circumferential direction of the plugger 30. The curve extension includes one or more of an arc, a broken line, a straight line, etc. Such a design, because the first connecting rod 324 and the second connecting rod 325 extend in a circumferential curve on the circumferential surface of the plugger 30, the proximal stent 31 and the distal stent 33 can bend close along the circumferential direction of the first connecting rod 324 and the second connecting rod 325, so that the whole plugger 30 has a shape similar to a spiral extension from the proximal end to the distal end, improving the bending performance of the plugger 30. When the plugger 30 is in a curved blood vessel, its shape similar to a spiral extension can be deformed to bend, which can well adapt to the curved blood vessel, so that the plugger 30 can tightly fit the inner wall of the curved blood vessel, effectively preventing the thrombus from falling off.

[0047] The structures of the proximal stent 31, the middle stent 32 and the distal stent 32 of the plugger 30 will be explained in detail below. Please refer to Figure 6The proximal bracket 31 comprises a first support rod 311 and a first mesh unit 312 in sequence. The proximal end of the first support rod 311 converges at the proximal end of the proximal bracket 31, the other part of the first support rod 311 extends outward, and the distal end of the first support rod 311 is connected with the distal end of the first mesh unit 312. In this embodiment, the first support rod 311 is integrally formed with the first mesh unit 312. 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 most distant end points. In this embodiment, the number of the first support rod 311 is two, and the two first support rods 311 are symmetrically distributed about the central axis of the snare 30, so that the external force is uniformly and symmetrically transmitted to the first mesh unit 312, the middle bracket 32 of the snare 30 through the two first support rods 311. In other embodiments, the number of the first support rod 311 is one.

[0048] Please refer to Figure 6 and Figure 7 , Figure 7 is Figure 6 the enlarged view 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 snare 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 greater than the rod width of the middle bracket 32, and the rod width of the first support rod 311 is greater than the rod width of the distal bracket 33. The rigidity of the first support rod 311 is greater than the rigidity of other different positions of the snare 30, the first support rod 311 is more difficult to deform than other different parts of the snare 30, and the first support rod 311 can maintain the shape unchanged while effectively transmitting the external force to other different positions of the snare 30.

[0049] In this embodiment, the rod width of the first support rod 311 gradually increases in the direction from the distal end to the proximal end in the axial direction, and the greater the rigidity of the first support rod 311, the more difficult to deform. With such a design, the part of the first support rod 311 close to the proximal end has greater rigidity and is not easy to bend, avoiding the first support rod 311 bending and affecting the recovery of the snare 30.

[0050] In this embodiment, the first mesh unit 312 in the proximal bracket 31 is symmetrical about the central axis of the snare 30, the first mesh unit 312 can uniformly receive the force transmitted by the push-pull wire 20 and the first support rod 311, and can ensure the radial support force of the proximal bracket 31 after the proximal bracket 31 is released from the microcatheter 10. In other embodiments, the first mesh unit 312 in the proximal bracket 31 can not be symmetrical about the central axis of the snare 30, so as to ensure the radial support force of the proximal bracket 31.

[0051] As for the middle support 32. In the present embodiment, the middle support 32 comprises a first capturing portion 321, a second capturing portion 322, a third capturing portion 323, a first connecting rod 324, a second connecting rod 325 and a third connecting rod 326. The first capturing portion 321, the second capturing portion 322 and the third capturing portion 323 are arranged in sequence 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 in sequence from the proximal end to the distal end. In the present embodiment, the first capturing portion 321 is arranged between two adjacent first mesh units 312 in the proximal support 31. Figure 6 In the present embodiment, the first capturing portion 321 is arranged between two adjacent first mesh units 312 in the proximal support 31.

[0052] The proximal end of the first connecting rod 324 is fixedly connected to the first mesh unit 312 at the distal end of the proximal support 31. In the present embodiment, the first connecting rod 324 is fixedly connected to the converging portion of the first mesh unit 312 at the distal end. In other embodiments, the first connecting rod 324 can also be fixedly connected to a non-converging portion of the first mesh unit 312.

[0053] In the present embodiment, the distal end of the first connecting rod 324 is fixedly connected to the second capturing portion 322. In the present embodiment, the number of first connecting rods 324 is two, and the two first connecting rods 324 are oppositely arranged. The proximal end of the third connecting rod 326 is fixedly connected to the second capturing portion 322, and the distal end of the third connecting rod 326 is fixedly connected to the third capturing portion 323. The proximal end of the second connecting rod 325 is fixedly connected to the third capturing portion 323, and the distal end of the second connecting rod 325 is fixedly connected to the distal support 33.

[0054] In the present embodiment, the first capturing portion 321 and the second capturing portion 322 only partially overlap in the projection perpendicular to the plane containing the longitudinal central axis of the thrombus extractor 30. Moreover, the distal end of the first capturing portion 321 and the distal end of the second capturing portion 322 are spaced apart from each other in the projection on the plane containing the longitudinal central axis of the thrombus extractor. Such design allows the thrombus extractor 30 to capture the thrombus at different positions on the circumferential surface thereof at the same time, thereby facilitating the improvement of the capturing effect of the thrombus extractor 30. Specifically, in combination with the above-mentioned design of the first connecting rod 324, the thrombus extractor 30 can capture the thrombus at different positions on the circumferential surface thereof at the same time. Figure 6 In the present embodiment, part of the first connecting rod 324 is inclined and curved on the circumferential surface of the thrombus extractor 30 relative to the positive direction of the X-axis. In other embodiments, the first connecting rod 324 can be inclined and curved in other directions on the circumferential surface of the thrombus extractor 30, as long as it can improve the capturing effect of the thrombus extractor 30.

[0055] In this embodiment, the first link 324, the third link 326, and the second link 325 are arranged sequentially from proximal to distal in the axial direction. Each of the first link 324, the third link 326, and the second link 325 is arc-shaped and extends in a circumferential curve on the circumferential surface of the thrombectomy device 30. Among the distal ends of the first grasping portion 321, the third grasping portion 323, and the second grasping portion 322, at least two adjacent distal ends of the grasping portions are spaced apart on the projection of their distal ends onto a plane perpendicular to the longitudinal central axis of the thrombectomy device. This allows the thrombectomy device 30 to simultaneously grasp thrombi at different positions on its circumferential surface, thereby improving the grasping effect of the thrombectomy device 30. In other embodiments, at least two adjacent distal ends of the first grasping portion 321, the third grasping portion 323, and the second grasping portion 322 are all spaced apart on the projection of their distal ends onto a plane perpendicular to the longitudinal central axis of the retrieval device. This further offsets the positions of the distal ends of the first grasping portion 321, the third grasping portion 323, and the second grasping portion 322 on the circumferential surface of the retrieval device 30, thereby improving the grasping effect of the retrieval device 30.

[0056] Compared to the case where the connecting rods are parallel along the axial direction, in this embodiment, the first connecting rod 324, the third connecting rod 326, and the second connecting rod 325 extend in a circumferential curve on the circumferential surface of the thrombectomy device 30, giving the first connecting rod 324, the third connecting rod 326, and the second connecting rod 325 good bending deformation ability in the axial direction. The proximal stent 31, the middle stent 32, and the distal stent 33 can easily bend towards each other. During the process of passing through the curved blood vessel 100, the proximal stent 31, the middle stent 32, and the distal stent 33 can fit well into the curved blood vessel 100, avoiding the thrombus from detaching from the thrombectomy device 30 due to the thrombectomy device 30 not fitting into the inner wall of the blood vessel 100.

[0057] Specifically Figure 6 In this embodiment, the first link 324, part of the third link 326, and part of the second link 325 are inclined and bent downward along the circumference of the thrombectomy device 30 relative to the positive direction of the X-axis. In other embodiments, the first link 324, the third link 326, and the second link 325 may also be inclined and bent along different or partially the same directions on the circumference of the thrombectomy device 30, so as to achieve better bending performance of the thrombectomy device 30.

[0058] In the present embodiment, the partial first link 324 and the partial third link 326 are parallel to each other. The partial first link 324 and the partial third link 326 being parallel to each other means that the partial first link 324 and the partial third link 326 are parallel to each other while there is a part of the partial first link 324 and the partial third link 326 that are not parallel. Specifically, in the present 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 link 324 but is parallel to the X-axis. Such a design can increase the distance between the second capturing portion 322 and the third capturing portion 323, increase the opening size of the second capturing portion 322 and the third capturing portion 323, facilitate the thrombus to enter from the opening between the second capturing portion 322 and the third capturing portion 323, and improve the performance of the thrombus capturing device 30 in capturing the thrombus.

[0059] In the present embodiment, the partial first link 324, the partial second link 325, and the partial third link 326 are parallel to each other, so that the proximal support 31 and the distal support 33 are easy to bend and extend in the same direction. The partial first link 324, the partial second link 325, and the partial third link 326 being parallel to each other means that the partial first link 324, the partial second link 325, and the partial third link 326 are parallel to each other while there is at least a part of the partial first link 324, the second link 325, and the third link 326 that are not parallel. In the present embodiment, the second link 325 is in an arch shape, and a part of the second link 325 is inclined upward along the positive direction of the X-axis, and this part of the second link 325 is parallel or approximately parallel to the first link 324. Such a design can increase the distance between the first capturing portion 321, the second capturing portion 322, and the third capturing portion 323, increase the opening size of the first capturing portion 321, the second capturing portion 322, and the third capturing portion 323, facilitate the thrombus to enter from the opening between the first capturing portion 321, the second capturing portion 322, and the third capturing portion 323, and improve the performance of the thrombus capturing device 30 in capturing the thrombus. In other embodiments, the partial first link 324, the partial second link 325, and the partial third link 326 can be approximately parallel to each other to achieve the purpose of the proximal support 31 and the distal support 33 being easy to bend and extend in the same direction.

[0060] A virtual line exists between the distal end of the first connecting rod 324 and the proximal end of the second connecting rod 325 on the circumferential surface of the vaso-occlusive device 30, and the first connecting rod 324, the virtual line, and the second connecting rod 325 can form a helical line around the longitudinal central axis of the vaso-occlusive device 30, so that the vaso-occlusive device 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 line, and the second connecting rod 325 can form a curved line around the longitudinal central axis of the vaso-occlusive device 30, which can be similar to a helical line.

[0061] In the present 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 the second connecting rods 325 and the third connecting rods 326 is each two, which are arranged opposite to each other.

[0062] A virtual line exists between one of the first connecting rods 324 and one of the second connecting rods 325. Another virtual line also exists between the other first connecting rod 324 and the other second connecting rod 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 vaso-occlusive device 30, and the two helical lines are not connected to each other. The formation of the two helical lines in the vaso-occlusive device 30 can further improve the performance of the vaso-occlusive device 30 in bending and deforming, and the vaso-occlusive device 30 is easy to bend and better conforms to the inner wall of the curved blood vessel, thereby effectively preventing the thrombus from falling off. In other embodiments, the vaso-occlusive device 30 can only form one helical line, so that the vaso-occlusive device 30 can bend and deform along the helical direction of the helical line. In other embodiments, the vaso-occlusive device 30 can form three or more helical lines, and the specific number of the helical lines is subject to the effect of making the vaso-occlusive device 30 easy to bend and closely conform to the inner wall of the blood vessel.

[0063] In the present embodiment, a first virtual line 327 exists between the distal end of the first connecting rod 324 and the proximal end of the third connecting rod 326 on the circumferential surface of the vaso-occlusive device 30, and a second virtual line 328 also exists between the distal end of the third connecting rod 326 and the proximal end of the second connecting rod 325 on the circumferential surface of the vaso-occlusive device 30. The first connecting rod 324, the first virtual line 327, the third connecting rod 326, the second virtual line 328, and the second connecting rod 325 can form a helical line around the longitudinal central axis of the vaso-occlusive device 30. Such a design makes the vaso-occlusive device 30 composed of the proximal support 31, the middle support 32, and the distal support 33 have a shape similar to a helical extension and be easy to bend.

[0064] In other embodiments, the middle support 32 can only include the first connecting rod 324 and the second connecting rod 325, so that the vaso-occlusive device 30 can well conform to the curved blood vessel 1000.

[0065] 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 the present embodiment, the first link 324 is inclined downward as a whole with respect to the positive direction of the X axis. The second link 325 is inclined downward with respect to the positive direction of the X axis in part. The part of the second link 325 that is inclined with respect 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 partly the same as the shape of the first link 324. The second link 325 is arched, and part of the second link 325 is inclined upward with respect to the positive direction of the X axis, and this part of the second link 325 is parallel or approximately parallel to the first link 324. Another part of the second link 325 is inclined downward with respect to the positive direction of the X axis.

[0066] The third link 326 includes a flat section 3261 and an inclined section 3262. The proximal end of the flat section 3261 is fixedly connected to the second capture portion 322, the distal end of the flat section 3261 is fixedly connected to the proximal end of the inclined section 3262, and the distal end of the inclined section 3262 is fixedly connected to the third capture portion 323. The inclined section 3262 is parallel or approximately parallel to the first link 324, and the extension direction of the flat section 3261 is parallel to the X axis, which can increase the distance between the second capture portion 322 and the third capture portion 323, increase the opening size of the second capture portion 322 and the third capture portion 323, facilitate the thrombus to enter from the opening between the second capture portion 322 and the third capture portion 323, and improve the performance of the thrombus retriever 30 in capturing the thrombus.

[0067] The shapes of the first link 324, the second link 325, and the third link 326 are partly the same, which facilitates the arrangement of the positions of the proximal support 31, the middle support 32, and the distal support 33, so that the thrombus retriever 30 as a whole can have good bending performance while ensuring the arrangement of the overall structure of the thrombus retriever 30. In other embodiments, the shapes of the first link 324, the second link 325, and the third link 326 can be the same, provided that the first link 324, the second link 325, and the third link 326 can enable the thrombus retriever 30 as a whole to have a tendency to extend spirally in the circumferential direction and have good bending performance.

[0068] Please refer to Figure 6 and Figure 8 , Figure 8 are Figure 6 enlarged views of the XX in FIG. 8. Under other conditions remain unchanged, the rod width of the proximal end of the first link 324 is greater than the rod width of the middle part of the first link 324, which can improve the strength of the proximal end of the first link 324 and make the proximal end of the first link 324 more difficult to break than the middle part of the first link 324. The rod width of the distal end of the first link 324 is also greater than the rod width of the middle part of the first link 324, and the distal end of the first link 324 is more difficult to break. Correspondingly, the second link 325 and the third link 326 also have similar settings, which will not be described here.

[0069] In the present embodiment, the first link 324 is rounded at its proximal end to avoid stress concentration and easy breakage. The first link 324 is rounded at its distal end, the second link 325 is rounded at its proximal and distal ends, and the third link 326 is rounded at its proximal and distal ends.

[0070] Please refer to Figure 6 , the width of the first link 324, the width of the second link 325, and the width of the third link 326 are greater than the width of the net rods in the distal support 33, and the width of the first link 324, the width of the second link 325, and the width of the third link 326 are less than the width of the first support rod 311 in the proximal support 31. Such a design makes the strength of the first link 324, the second link 325, and the third link 326 greater than the strength of the net rods in the distal support 33, and less than the strength of the first support rod 311, so that the first link 324, the second link 325, and the third link 326 are easy to bend and deform while having better strength and not easy to break.

[0071] The first capture portion 321, the second capture portion 322, and the third capture portion 323 are described below. Please refer to Figures 4 to 6 , the first capture portion 321 includes a first sub-capture member 3211 and a second sub-capture member 3212 arranged at intervals. The first sub-capture member 3211 and the second sub-capture member 3212 each include two net rods, the proximal ends of which are connected to the net rod portions of adjacent first net rod units, and the distal ends of which converge together. The part where the two net rods converge at the distal ends is suspended. When the snare 30 is released in the blood vessel, the snare 30 will be squeezed by the blood vessel 100, the proximal end portions of the two net rods are compressed radially, and the part where the two net rods converge at the distal ends is expanded outward, facilitating the capture of the thrombus by the first capture portion. Correspondingly, the second capture portion 322 and the third capture portion 323 are similar in shape to the first capture portion 321. The second capture portion 322 and the third capture portion 323 each include two capture members, each of which is surrounded by two net rods. The proximal ends of these net rods are fixedly connected to the net rod units in the middle support 32, and the part where the net rods converge at the distal ends is suspended.

[0072] In the embodiment, the first sub-grabbing member 3211 and the second sub-grabbing member 3212 in the first grabbing portion 321 partially overlap on the projection on the plane containing the longitudinal central axis of the vena cava filter 30. Specifically, part of the first sub-grabbing member 3211 and part of the second sub-grabbing member 3212 are aligned, and the distance from the distal end of the first sub-grabbing member 3211 to the proximal end of the vena cava filter 30 is greater than the distance from the distal end of the second sub-grabbing member 3212 to the proximal end of the vena cava filter 30. During the process of retracting the first grabbing portion 321 into the microcatheter 10, the two opposite grabbing members are compressed into the microcatheter 10 without overlapping each other, reducing the thickness of the first grabbing portion 321 during the process of being compressed into the microcatheter 10, and facilitating the retraction of the first grabbing portion 321 into the microcatheter 10. Correspondingly, the two grabbing members in the second grabbing portion 322 and the two grabbing members in the third grabbing portion 323 also have similar shapes to the two grabbing members in the first grabbing portion 321, respectively, to facilitate the entry of the second grabbing portion 322 and the third grabbing portion 323 into the microcatheter 10.

[0073] In the embodiment, the distal end of the first grabbing portion 321 is wrapped with a developing point, and the distal end of the third grabbing portion 323 is also wrapped with a developing point, respectively. In other embodiments, the distal end of the second grabbing portion 322 can also be wrapped with a developing point.

[0074] The structure of the distal support 33 will be described below. The distal support 33 includes a plurality of uniformly arranged grid cells. When the vena cava filter 30 is deployed, the grid cells are approximately rhombic, and adjacent grid cells are connected to each other. The opening of the grid cells of the distal support 33 is smaller than the opening of the grid cells in the middle support, and the distal support 33 can intercept and accommodate the thrombus in the vena cava filter 30, preventing the thrombus from falling off.

[0075] The elastic member 50 will be described below. In the embodiment, the elastic member 50 extends into the interior of the vena cava filter 30, and the elastic member 50 is in the space enclosed by the vena cava filter 30. The distal end of the elastic member 50 is fixedly connected to the distal end of the vena cava filter 30, and the proximal end of the elastic member 50 is fixedly connected to the proximal end of the vena cava filter 30. Specifically, as shown in Figure 2 , the proximal end of the vena cava filter 30 is wrapped around the proximal end of the elastic member 50. The developing ring 40 is wrapped around the outer surface of the proximal end of the vena cava filter 30 to fix the proximal end of the vena cava filter 30 and the proximal end of the elastic member 50 together. Correspondingly, the distal end of the vena cava filter 30 is wrapped around the distal end of the elastic member 50. The developing ring 40 is wrapped around the outer surface of the distal end of the vena cava filter 30 to fix the distal end of the vena cava filter 30 and the distal end of the elastic member 50 together. The elastic member 50 is made of a metal material. The elastic member 50 extends spirally in the axial direction, forming a spiral shape, so that it has elasticity.

[0076] In the embodiment, the push-pull wire 20 is integrally formed with the elastic member 50. The push-pull wire 20 can slide the elastic member 50 in the process of the micro catheter 10 sliding. In other embodiments, the push-pull wire 20 and the elastic member 50 are two separate components, as long as the push-pull wire 20 and the elastic member 50 can be fixedly connected.

[0077] In the embodiment, in the process of the thrombus extraction device 1 being converted from the natural state to the compressed state, the proximal end and the distal end of the thrombus extractor 30 are away from each other, the distance between the proximal end and the distal end of the thrombus extractor 30 gradually increases, the thrombus extractor 30 is radially contracted as a whole, the thrombus extractor 30 is axially elongated as a whole, the distance between the proximal end and the distal end of the thrombus extractor 30 increases, which deforms the elastic member 50 and stretches the elastic member 50 in the axial direction. At this time, the elastic member 50 has a restoring force to restore the original shape, which can make the distal end and the proximal end of the thrombus extractor 30 close to each other, so as to prevent the axial extension of the thrombus extractor 30 from being too long. In combination Figures 1 to 3 , the operation process of the embodiment and the specific role of the elastic member 50 are described as follows:

[0078] The micro catheter 10 and the thrombus extractor 30 arranged in the micro catheter 10 are moved to the target position in the blood vessel 100. The thrombus extractor 30 is exposed outside the micro catheter 10, so that the thrombus extractor 30 is at least partially in the radial direction corresponding to the thrombus 200 on the inner wall of the blood vessel 100. The thrombus extractor 30 is inflated under the action of the radial expansion force of the thrombus extractor 30. The outer surface of at least part of the thrombus extractor 30 contacts the thrombus 200 on the inner wall of the blood vessel 100, and part of the thrombus 200 is embedded in the thrombus extractor 30. Then, the push-pull wire 20 is operated to withdraw the thrombus extractor 30 into the micro catheter 10, and the thrombus is dragged back into the catheter under the action of the radial expansion force of the thrombus extractor 30. Under the action of the withdrawal force, the proximal end of the thrombus extractor 30 moves away from the distal end of the thrombus extractor 30, so that the thrombus extractor 30 is contracted, and the restoring force of the elastic member 50 makes the distal end and the proximal end of the thrombus extractor 30 close to each other, so as to prevent the distance between the proximal end of the thrombus extractor 30 and the distal end of the thrombus extractor 30 from increasing too much, reduce the degree of contraction of the thrombus extractor 30 in the radial direction, and ensure that the thrombus extractor 30 can closely fit the inner wall of the blood vessel 100, thereby improving the success rate of dragging the thrombus 200 into the micro catheter 10. Moreover, the thrombus 200 enters the thrombus extractor 30, and the spiral extending elastic member 50 can increase the contact area with the thrombus 200, limit the movement of the thrombus 200, prevent the thrombus 200 from falling off, and improve the ability of the thrombus extractor 30 to recover the thrombus.

[0079] Please refer to Figure 3 , when the elastic member 50 is straightened in the compressed state of the thrombus extractor 30, the restoring force of the elastic member 50 is the largest. The axial length of the elastic member 50 when it is straightened is equal to the maximum axial length between the proximal end and the distal end of the thrombus extractor 30.

[0080] Second embodiment

[0081] Please refer to Figure 9 and Figure 10 , Figure 9 A cross-sectional view of the stent-retrieving device provided in the second embodiment of the present application; Figure 10 A cross-sectional view of the stent-retrieving device provided in the second embodiment of the present application. The stent-retrieving device 1a provided in the present embodiment is basically the same as that in the first embodiment, except that the elastic member 50a and the push-pull wire 20a are not integrally formed in the present embodiment. The elastic member 50a has elasticity and is formed of a high polymer material. The proximal end of the elastic member 50a is fixedly connected to 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 to the fixing ring 21a. Specifically, the elastic member 50a and the fixing ring 21a are wrapped and fixed together.

[0082] In the present embodiment, the stent-retrieving device 1a further comprises a connecting ring 60a. The distal end of the connecting ring 60a is fixedly connected to the distal end of the stent-retrieving device 30a. Specifically, the elastic member 50a and the connecting ring 60a are wrapped and fixed together. In the present embodiment, the elastic member 50a can pass through the opening of the connecting ring 30a and be fixedly wrapped on the connecting ring 60a. The elastic member 50a has elasticity by itself, and does not need to form a spiral structure in the axial direction to ensure the elasticity of the elastic member 50a. This arrangement can reduce the density of the components in the radial direction of the stent-retrieving device and is easier to be sheathed.

[0083] Third embodiment

[0084] Please refer to Figure 11 and Figure 12 , Figure 11 A cross-sectional view of the stent-retrieving device 1b provided in the third embodiment of the present application; Figure 12Figure 3 is a schematic view of the elastic member of the third embodiment of the present application. The thrombus extraction device 1b of the third embodiment is basically the same as the first embodiment, except that the elastic member 50b includes a flat section 51b and a spiral section 52b connected to the flat section 51b. In the axial direction, the flat section 51a is opposite to the capture portion 320b of the middle support 32b. Specifically, the capture portion 320b includes a first capture portion 321b, a second capture portion 322b, and a third capture portion 323b. The flat section 51a corresponds to the first capture portion 321b, the second capture portion 322b, and the third capture portion 323b of the thrombus extraction device, respectively. The flat section 51a is flat and extends in the axial direction, which can avoid interference between the flat section 51a and the first capture portion 321b, the second capture portion 322b, and the third capture portion 323b, and prevent the flat section 51a from winding around the first capture portion 321b, the second capture portion 322b, and the third capture portion 323b and affecting the deployment of the thrombus extraction device in the blood vessel. In other embodiments, the capture portion 320b can include only the first capture portion 321b or only the first capture portion 321b and the second capture portion 322b, as long as the capture portion 320b can achieve the function of capturing the thrombus.

[0085] In the present embodiment, the plurality of spiral sections 52b correspond to the proximal support 31b and the distal support 33b, respectively. The plurality of spiral sections 52b have a restoring force to restore to their original state after being stretched in the axial direction, which ensures the elasticity of the overall elastic member 50b. At the same time, the plurality of spiral sections 52b can increase the contact area with the thrombus and prevent the thrombus from falling off.

[0086] In the present embodiment, the flat section 51b is connected between two adjacent spiral sections 51b, so that after the thrombus enters the thrombus extraction device 30b corresponding to the flat section 51b, it is blocked by the adjacent spiral section 52b and is not easy to move, which improves the effect of preventing the thrombus from falling off of the thrombus extraction device 30b.

[0087] Fourth Embodiment

[0088] Please refer to Figure 13 and Figure 14 , Figure 13 is a cross-sectional view of the thrombus extraction device provided in the fourth embodiment of the present application; Figure 14This is a cross-sectional schematic diagram of the thrombectomy device in the fourth embodiment of this application. The thrombectomy device 1c provided in this embodiment is basically the same as that in the first embodiment, except that in this embodiment, the elastic element 50c includes a main body 51c and a plurality of puncture elements 52c fixedly connected to the main body 51c. The main body 51c extends axially. The plurality of puncture elements 52c are arranged at intervals in the main body 51c and are staggered in the circumferential direction. During the capture of thrombi, a single puncture element 52c can pierce the thrombus, fix the thrombus, and prevent the thrombus from falling out of the thrombectomy device 30c. Moreover, the plurality of puncture elements 52c can increase the contact area between the elastic element and the thrombus, and the plurality of adjacent puncture elements 52c can clamp the thrombus with each other, further improving the effect of preventing thrombus dislodgement.

[0089] In this embodiment, the angle between each puncture element 52c and the axis of the main body 51c is an acute angle, combined with Figure 13 The extension direction of the main body is parallel to the extension direction of the X-axis. The angle between each puncture element 52c and the axis of the main body is an acute angle, the same as the angle between each puncture element 52c and the positive direction of the X-axis. During the process of the thrombeclet 30c being compressed into the microcatheter 10c, the puncture element 52c can approach the main body 51c in a clockwise direction with the connection point with the main body 51c as the base point, thus smoothly entering the microcatheter 10c and ensuring that the microcatheter 10c can smoothly retrieve the thrombus and the thrombeclet 30c. To avoid the puncture element 52c being obtuse, which could easily abut against the inner wall of the microcatheter 10c or get stuck at the opening of the microcatheter 10c, thus hindering the entry of the thrombeclet 30c into the microcatheter.

[0090] Fifth embodiment

[0091] Please see Figures 15 to 17 , Figure 15 This is a cross-sectional schematic diagram of the thrombectomy device provided in the fifth embodiment of this application; Figure 16 This is a cross-sectional view of the puncture component in the thrombectomy device provided in the fifth embodiment of this application;

[0092] Figure 17 This is a cross-sectional view of the puncture member in the thrombectomy device provided in the fifth embodiment of this application from another angle. The thrombectomy device 1d provided in this embodiment is basically the same as that in the fourth embodiment, except that in this embodiment, the puncture member 52d is sleeved on the outer surface of the main body 51d. Specifically, the puncture member 52d is sleeved 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, thereby preventing the puncture member 52d from falling off.

[0093] In the embodiment, the main body 51d is provided with a receiving groove 53d. The partial puncture member 52d is received in the receiving groove 53d, and the partial puncture member 52d is limited in the axial direction by the inner wall of the receiving groove 53d, so that the puncture member 52d can only rotate around the outer surface of the main body 51d. The puncture member 52d can increase the contact area with the thrombus, improve the effect of capturing the thrombus and the effect of preventing the thrombus from falling off, and the puncture member 52d can rotate in accordance with the bending of the blood vessel to avoid injuring the inner wall of the blood vessel.

[0094] Sixth Embodiment

[0095] Please refer to Figure 18 , Figure 18 The cross-sectional view of the thrombectomy device provided in the sixth embodiment of the present application is shown in the figure. Figure 19 The structure of the elastic member provided in the sixth embodiment of the present application is shown in the figure. The thrombectomy device 1e provided in the embodiment is basically the same as the first embodiment, except that in the embodiment, the elastic member 50e includes a first spiral line 51e and a second spiral line 52e, and the first spiral line 51e and the second spiral line 52e extend by winding each other. The proximal end of the first spiral line 51e and the proximal end of the second spiral line 52e are fixedly connected to the distal end of the push-pull wire 20e and the proximal end of the thrombectomy device 30e after being closely attached and wound. In the natural state, the distal end of the first spiral line 51e and the distal end of the second spiral line 52e are fixedly connected to the distal end of the thrombectomy device 30e after being closely attached and wound. The main body part of the first spiral line 51e (except the proximal end of the first spiral line and the distal end of the first spiral line), and the main body part of the second spiral line 52e (except the proximal end of the second spiral line and the distal end of the second spiral line), extend in the axial direction by winding each other, and there is a gap between them, which together forms a receiving space.

[0096] In the thrombectomy process, in addition to limiting the axial extension of the thrombectomy device 30e, the elastic member can also increase the contact area with the thrombus during the thrombectomy process, so that part of the thrombus can be embedded in the receiving space between the first spiral line 51e and the second spiral line 52e, so that the thrombus is resisted by the first spiral line 51e and the second spiral line 52e and cannot easily fall off, preventing the thrombus from falling off.

[0097] Please refer to Figure 20 , Figure 20The structure diagram of the elastic member in the thrombus taking device provided by the seventh embodiment of the present application is shown. The thrombus taking device in the 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. The plurality means three or more. The proximal ends of the plurality of helical wires 53e are tightly wound and fixedly connected with the distal end of the push-pull wire 20e. The distal ends of the plurality of helical wires 53e are tightly wound and fixedly connected with the distal end of the thrombus taking device 30e. The plurality of helical wires 53e include a main body portion connected with the proximal end and the distal end thereof, the main body portion is accommodated in the interior of the thrombus taking device 30e, and the main body portion is helically extended and staggered with each other to surround the accommodation space 54e. The thrombus entering the accommodation space 54e is difficult to escape from the accommodation space 54e due to the limitation of the plurality of helical wires 53e. Moreover, the plurality of helical wires 53e cooperates with the thrombus taking device 30e, the thrombus is clamped between the thrombus taking device 30e and the plurality of helical wires 53e, and the thrombus is effectively prevented from falling off.

[0098] The technical features of the above embodiments can be combined in any manner. To make the description simple, all possible combinations of the technical features in the above embodiments are not described, however, as long as the combinations of the technical features do not contradict, they should be considered as the scope of the present application.

[0099] The above embodiments only express several embodiments of the present application, the description is more specific and detailed, but it should not be understood as a limitation on the scope of the patent. It should be pointed out that for ordinary skilled in the art, without departing from the concept of the present application, a number of variations and improvements can be made, which are within the scope of the present application. Therefore, the scope of protection of the present application should be subject to the appended claims.

Claims

1. A thrombectomy device, comprising: The thrombectomy device comprises a thrombectomy device, which comprises a proximal support, a middle support and a distal support arranged in sequence from proximal end to distal end, the middle support comprises first connecting rods and second connecting rods arranged at intervals, the proximal end of the first connecting rod is connected with the proximal support, the distal end of the second connecting rod is connected with the distal support, and the first connecting rod and the second connecting rod extend in a circumferential curve on the circumferential surface of the thrombectomy device. The middle support comprises a first capture part, the first capture part is arranged adjacent to the first connecting rod on the circumferential surface of the thrombectomy device, the proximal end of the first capture part is fixedly connected with the proximal support, and the distal end of the first capture part is suspended.

2. The thrombectomy device of claim 1, wherein, There is a virtual connecting line between the distal end of the first connecting rod and the proximal end of the second connecting rod on the circumferential surface of the thrombectomy device, and the first connecting rod, the virtual connecting line and the second connecting rod can form a spiral line around the longitudinal central axis of the thrombectomy device.

3. The thrombectomy device of claim 1, wherein, The number of the first connecting rods is two, and the number of the second connecting rods is two, wherein there is a virtual connecting line between one of the first connecting rods and one of the second connecting rods, and there is also a virtual connecting line between the other first connecting rod and the other second connecting rod, and the first connecting rod, the virtual connecting line between the first connecting rod and the second connecting rod and the second connecting rod form two spiral lines around the longitudinal central axis of the thrombectomy device, and the two spiral lines are not connected with each other.

4. The thrombectomy device of claim 1, wherein, The first capture part comprises a first sub-capture part and a second sub-capture part, the first sub-capture part and the second sub-capture part are arranged at intervals on the circumferential surface of the thrombectomy device, the first connecting rod is arranged between the first sub-capture part and the second sub-capture part, and the projections of the first sub-capture part and the second sub-capture part on at least one plane containing the longitudinal central axis of the thrombectomy device are partially overlapped.

5. The thrombectomy device of claim 1, wherein, The middle support further comprises a second capture part, the second capture part is arranged in sequence from proximal end to distal end with the first capture part, the proximal end of the second capture part is fixedly connected with the distal end of the first connecting rod, the distal end of the second capture part is suspended, and the distal end of the second capture part and the distal end of the first capture part are spaced apart on the projection perpendicular to the plane containing the longitudinal central axis of the thrombectomy device.

6. The thrombectomy device of claim 5, wherein, The middle support further comprises a third capture part, the distal end of the third capture part is suspended, the first capture part, the third capture part and the second capture part are arranged in sequence from proximal end to distal end, the proximal end of the third capture part is connected with the first connecting rod, the distal end of the third capture part is adjacent to the second connecting rod, and at least two adjacent ones of the distal end of the first capture part, the distal end of the third capture part and the distal end of the second capture part are spaced apart on the projection perpendicular to the plane containing the longitudinal central axis of the thrombectomy device.

7. The thrombectomy device of claim 1, 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, and the third connecting rod extends in a circumferential curve on the circumferential surface of the thrombectomy device.

8. The thrombectomy device of claim 7, wherein, There is a first virtual connecting line between the distal end of the first connecting rod and the proximal end of the third connecting rod on the peripheral surface of the vaso-occlusive device, and there is a second virtual connecting line between the distal end of the third connecting rod and the proximal end of the second connecting rod on the peripheral surface of the vaso-occlusive device, and the first connecting rod, the first virtual connecting line, the third connecting rod, the second virtual connecting line, and the second connecting rod can form a helical line around the longitudinal central axis of the vaso-occlusive device.

9. The thrombectomy device of claim 1, wherein, Part of the first connecting rod and part of the second connecting rod are parallel to each other.

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