A device for removing a thrombus

Abstract

The application belongs to the technical field of medical devices, and discloses a thrombus taking device, which comprises a thrombus taking assembly, the thrombus taking assembly comprising a pushing rod, a thrombus taking support and a filter screen; wherein the pushing rod is connected with the thrombus taking support, and the pushing rod can drive the thrombus taking support in a contracted state to penetrate through a thrombus in a blood vessel; the filter screen is covered on the thrombus taking support, the thrombus taking support can be in an expanded state and can open the filter screen to make two ends of the filter screen adhere to the inner wall of the blood vessel to form a thrombus taking cavity. The thrombus taking device provided by the application can drive the thrombus taking support in a contracted state to penetrate through a thrombus after the pushing rod drives the thrombus taking support in a contracted state to penetrate through the thrombus, the thrombus taking support is in an expanded state and opens the filter screen, the thrombus is placed in the thrombus taking cavity, and because the two ends of the filter screen adhere to the inner wall of the blood vessel, the situation that the thrombus which is effectively prevented from falling off and being damaged is separated from the thrombus taking cavity and blocks downstream blood vessels along with blood flow does not occur during the process of pulling back the pushing rod.

Description

TECHNICAL FIELD

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

[0002] Pulmonary embolism (PE) is a potentially life-threatening disease, acute PE can cause systemic hypotension and even heart failure, and further cause patient death, which is one of the three major fatal cardiovascular diseases together with myocardial infarction and stroke. The most common embolus in pulmonary embolism is thrombus. The current common treatment methods mainly include pulmonary endarterectomy, thrombus aspiration, intracatheter thrombolysis and mechanical thrombectomy. Among them, mechanical thrombectomy mainly removes thrombus through crushing, aspiration, stent or basket thrombectomy, and has become a research hotspot in recent years.

[0003] At present, the mechanical thrombectomy technology expands the stent after embedding with the thrombus and drags the thrombus to the thrombus suction catheter, and uses the suction device to aspirate the thrombus out of the body, but the thrombus will be broken and detached during the thrombus removal process, and the detached thrombus will block the downstream blood vessels with the blood flow, resulting in poor thrombus removal effect. SUMMARY

[0004] The purpose of the present application is to provide a thrombus removal device which can effectively prevent the detached thrombus from blocking the downstream blood vessels with the blood flow.

[0005] To achieve this purpose, the present application adopts the following technical solutions:

[0006] A thrombus removal device, comprising a thrombus removal assembly, the thrombus removal assembly comprising a pushing rod, a thrombus removal stent and a filter screen, wherein,

[0007] The pushing rod is connected with the thrombus removal stent, and the pushing rod can drive the thrombus removal stent in a contracted state to penetrate the thrombus in the blood vessel;

[0008] The filter screen is wrapped on the thrombus removal stent, and the thrombus removal stent can be expanded and open the filter screen to make the two ends of the filter screen adhere to the inner wall of the blood vessel to form a thrombus removal cavity accommodating the thrombus.

[0009] Optionally, the thrombus removal assembly further comprises an inner tube and a fixing ring, the proximal end of the inner tube is connected with the distal end of the pushing rod, the distal end of the inner tube is provided in the thrombus removal stent, and the fixing ring is sleeved on the inner tube and can fix the proximal end of the thrombus removal stent on the inner tube;

[0010] The thrombus removal device further comprises a guide wire, the guide wire can be provided in the inner tube, and the guide wire is configured to guide the movement of the inner tube towards the thrombus.

[0011] Optionally, a plurality of connecting rods are arranged at the proximal end of the thrombus extraction stent, and the ends of the connecting rods are provided with clamping protrusions.

[0012] Optionally, the fixing ring comprises:

[0013] an inner ring, which is sleeved on the inner tube;

[0014] a middle ring, which is sleeved on the inner ring and is provided with a plurality of open grooves at intervals in the circumferential direction;

[0015] an outer ring, which is sleeved on the middle ring; wherein

[0016] the open grooves, the inner ring and the outer ring form the clamping grooves.

[0017] Optionally, a Tip head is arranged at the distal end of the inner tube, which can assist the thrombus extraction assembly in penetrating the thrombus.

[0018] Optionally, the two ends of the filter screen are fixedly connected with the thrombus extraction stent, and the middle part of the filter screen is in a free form.

[0019] Optionally, the thrombus extraction stent is formed by laser cutting of a memory alloy pipe or is formed by wire knitting.

[0020] Optionally, the filter screen is formed by laser punching of a high polymer film or is formed by wire knitting.

[0021] Optionally, the thrombus extraction assembly is arranged in a guide catheter, and the thrombus extraction stent is in a contracted state in the guide catheter.

[0022] Optionally, a developing mark is arranged at the distal end of the thrombus extraction stent.

[0023] Beneficial effects:

[0024] The thrombus extraction device provided by the application has the beneficial effects that after the thrombus extraction stent in a contracted state is moved from the proximal end of the blood vessel to the distal end of the blood vessel and penetrates the thrombus, the thrombus extraction stent is in an expanded state and expands the filter screen, the thrombus is arranged in the thrombus extraction cavity, the thrombus is moved towards the thrombus suction catheter by pulling back the push rod, and in the process of pulling back the push rod, because the two ends of the filter screen are attached to the inner wall of the blood vessel, the thrombus that is effectively prevented from falling off and being damaged is prevented from separating from the thrombus extraction cavity and blocking the downstream blood vessel along with the blood flow. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 is a structural schematic view of the thrombus extraction assembly provided by the first embodiment of the application;

[0026] Figure 2 is the structure schematic diagram of the thrombus extraction stent provided by embodiment one of the present application in a contracted state;

[0027] Figure 3 is the structure schematic diagram of the thrombus extraction stent provided by embodiment one of the present application penetrating a thrombus;

[0028] Figure 4 is the structure schematic diagram of the thrombus extraction stent provided by embodiment one of the present application in an expanded state;

[0029] Figure 5 is the structure schematic diagram of the guide catheter provided by embodiment one of the present application;

[0030] Figure 6 is the structure schematic diagram of the proximal end of the thrombus extraction stent provided by embodiment one of the present application;

[0031] Figure 7 is the structure schematic diagram of the fixing ring provided by embodiment one of the present application;

[0032] Figure 8 is the structure schematic diagram of the middle ring provided by embodiment one of the present application;

[0033] Figure 9 is the structure schematic diagram of the filter screen provided by embodiment one of the present application by laser drilling;

[0034] Figure 10 is the structure schematic diagram of the filter screen provided by embodiment one of the present application by weaving;

[0035] Figure 11 is the structure schematic diagram of the filter screen provided by embodiment one of the present application in a sandglass shape;

[0036] Figure 12 is the structure schematic diagram of the proximal end of the thrombus extraction stent provided by embodiment two of the present application.

[0037] In the figure:

[0038] 110, push rod; 120, thrombus extraction stent; 121, connecting rod; 122, clamping protrusion; 123, stent rod; 1231, developing mark; 130, filter screen; 131, thrombus extraction cavity; 140, inner tube; 141, Tip head; 150, fixing ring; 151, clamping groove; 152, inner ring; 153, middle ring; 1531, opening groove; 154, outer ring;

[0039] 200, blood vessel; 300, thrombus;

[0040] 400, guide wire; 500, guide catheter; 600, thrombus extraction catheter. DETAILED DESCRIPTION

[0041] The application will be described in further detail below with reference to the drawings and embodiments. It is to be understood that the specific embodiments described herein are merely illustrative of the application and are not intended to limit the application. It is also to be understood that, for the purpose of description, only the parts and structures that are related to the application are shown in the drawings.

[0042] In the description of the application, unless otherwise explicitly specified and limited, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the application can be understood according to the specific circumstances.

[0043] In the present application, unless otherwise explicitly specified and limited, the "upper" or "lower" of the first feature to the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the "upper", "above" and "on" of the first feature to the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The "below", "below" and "below" of the first feature to the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0044] In the description of the present embodiment, the terms "upper", "lower", "right", and other orientation or position relationships are based on the orientation or position relationship shown in the drawings, and are only for the convenience of description and simplification of operation, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the application. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0045] Referring to Figures 1 to 4 As shown in the drawings, the present embodiment provides a thrombus taking device, which comprises a thrombus taking assembly, the thrombus taking assembly comprising a pushing rod 110, a thrombus taking support 120 and a filter screen 130; wherein the pushing rod 110 is connected with the thrombus taking support 120, and the pushing rod 110 can drive the thrombus taking support 120 in a contracted state to penetrate through the thrombus 300 in the blood vessel 200; the filter screen 130 is wrapped on the thrombus taking support 120, and the thrombus taking support 120 can be in an expanded state and expand the filter screen 130 to make the two ends of the filter screen 130 adhere to the inner wall of the blood vessel 200 to form a thrombus taking cavity 131 accommodating the thrombus 300.

[0046] In the embodiment, after the push rod 110 drives the thrombus-removing stent 120 in a contracted state to move from the proximal end of the blood vessel 200 to the distal end of the blood vessel 200 and penetrate the thrombus 300, the thrombus-removing stent 120 is in an expanded state and props open the filter screen 130, the thrombus 300 is placed in the thrombus-removing cavity 131, and the thrombus 300 is moved toward the thrombus-removing catheter 600, i.e., toward the proximal end of the blood vessel 200, by pulling back the push rod 110. During the process of pulling back the push rod 110, because the two ends of the filter screen 130 are attached to the inner wall of the blood vessel 200, the thrombus 300 that is effectively prevented from falling off and breaking is prevented from separating from the thrombus-removing cavity 131 and blocking the downstream blood vessel 200 along with the blood flow. The thrombus-removing device combines the characteristics of the thrombus-removing stent 120 and the distal protection, can remove the thrombus out of the body, and can also protect the downstream blood vessel 200.

[0047] In the embodiment, the thrombus-removing stent 120 is cut by laser cutting from a memory alloy pipe or is woven from a wire. Preferably, the material of the thrombus-removing stent 120 can be nickel-titanium alloy, which has good biocompatibility and unique super-elasticity and can be deformed greatly. Of course, the material of the thrombus-removing stent 120 can be other materials, which are not limited herein.

[0048] In the embodiment, continuing to refer to Figure 2 As shown, the distal end of the thrombus-removing stent 120 is provided with a developing mark 1231 to increase the developing property of the thrombus-removing stent 120 and accurately position the thrombus-removing stent 120.

[0049] Preferably, the developing mark 1231 can be a developing ring. Specifically, the developing ring can be sleeved on each stent rod 123 at the distal end of the thrombus-removing stent 120, and the relative positions between the developing rings can be observed to determine whether the thrombus-removing stent 120 is in a contracted state or an expanded state.

[0050] Preferably, the developing mark 1231 can also be a developing ring. Specifically, the developing ring can be connected to each stent rod 123 at the distal end of the thrombus-removing stent 120, and the shape change of the developing ring can be observed to determine whether the thrombus-removing stent 120 is in a contracted state or an expanded state.

[0051] In the embodiment, referring to Figures 3 to 4As shown, the thrombectomy assembly further comprises an inner tube 140 and a fixing ring 150, the proximal end of the inner tube 140 is connected with the distal end of the push rod 110, the distal end of the inner tube 140 is provided in the thrombectomy stent 120, and the fixing ring 150 is sleeved on the inner tube 140 and can fix the proximal end of the thrombectomy stent 120 on the inner tube 140. Further, the thrombectomy device further comprises a guide wire 400, the guide wire 400 can be provided in the inner tube 140, and the guide wire 400 is configured to guide the movement of the inner tube 140 towards the thrombus 300. In this embodiment, first, the guide wire 400 is inserted from the proximal end of the blood vessel 200 and penetrates the thrombus 300 at the distal end of the blood vessel 200 along the blood vessel 200, then the inner tube 140 is sleeved on the proximal end of the guide wire 400, and the inner tube 140 drives the thrombectomy stent 120 to move towards the distal end of the blood vessel 200 and penetrate the thrombus 300 through the pushing of the push rod 110 and the guidance of the guide wire 400, the whole process can be completed under the guidance of the digital subtraction angiography (DSA) system, and the whole process is safe and reliable. In addition, the proximal end of the thrombectomy stent 120 is fixed on the inner tube 140 by the fixing ring 150, which is convenient and reliable.

[0052] In this embodiment, continuing to refer to Figures 3 to 4 As shown, the distal end of the inner tube 140 is provided with a Tip head 141, which can assist the thrombectomy assembly in penetrating the thrombus 300.

[0053] Specifically, the Tip head 141 is conical in shape and has a smooth head, which effectively prevents damage to the blood vessel 200 and facilitates penetration of the thrombus 300.

[0054] Specifically, the Tip head 141 is provided with a perforation, and the guide wire 400 can be attached to the inner side of the perforation to reduce the shaking of the inner tube 140 during movement along the guide wire 400, and the Tip head 141 can be positioned to penetrate the thrombus 300 in cooperation with the guidance of the guide wire 400, effectively preventing the inner tube 140 from being offset at the thrombus 300, ensuring that the thrombectomy stent 120 penetrates the thrombus 300 from the middle, and further improving the effect of the thrombectomy cavity 131 formed by the filter screen 130 and the wall of the blood vessel 200 on wrapping the thrombus 300.

[0055] Specifically, the distal end of the inner tube 140 protrudes from the distal end of the thrombectomy stent 120, so that the Tip head 141 is placed outside the thrombectomy stent 120, and the Tip head 141 can first penetrate the thrombus 300, so that the penetration hole on the thrombus 300 is opened, facilitating the thrombectomy stent 120 to penetrate the thrombus 300.

[0056] In this embodiment, referring to Figures 3 to 5As shown, the thrombus extraction device further comprises a guide catheter 500, the thrombus extraction assembly can be arranged in the guide catheter 500, and the thrombus extraction stent 120 is in a contracted state in the guide catheter 500. In this embodiment, the thrombus extraction stent 120 is extruded by the guide catheter 500 to be in a contracted state, and after the guide catheter 500 and the thrombus extraction stent 120 penetrate through the thrombus 300, the guide catheter 500 is moved towards the proximal end of the blood vessel 200 to make the thrombus extraction stent 120 expand to be in an expanded state.

[0057] Specifically, the distal end of the inner tube 140 protrudes from the distal end of the guide catheter 500, so that the Tip head 141 is arranged outside the guide catheter 500, and then the Tip head 141 can first penetrate through the thrombus 300 to make the penetration hole on the thrombus 300 open, so as to facilitate the guide catheter 500 and the thrombus extraction stent 120 to pass through the thrombus 300. In this embodiment, the guide catheter 500 and the Tip head 141 are in clearance fit, so that the inner diameter of the guide catheter 500 is slightly larger than the outer diameter of the Tip head 141, and then the size of the penetration hole on the thrombus 300 which is opened is large enough for the guide catheter 500 to pass through.

[0058] In this embodiment, referring to Figures 6 to 8 As shown, the proximal end of the thrombus extraction stent 120 is provided with a plurality of connecting rods 121, the distal end of the connecting rod 121 is provided with a clamping protrusion 122, the fixing ring 150 is provided with a plurality of clamping grooves 151 which are arranged in a circumferential direction and correspond to the clamping protrusions 122 one by one, and the clamping protrusions 122 and the clamping grooves 151 are clamped to realize the fixed connection between the thrombus extraction stent 120 and the fixing ring 150, which is simple in structure and convenient to assemble.

[0059] Specifically, referring to Figures 7 to 8 As shown, the fixing ring 150 comprises an inner ring 152, a middle ring 153 and an outer ring 154, the inner ring 152 is sleeved on the inner tube 140, the middle ring 153 is sleeved on the inner ring 152, and the outer ring 154 is sleeved on the middle ring 153, and the middle ring 153 is provided with a plurality of open grooves 1531 arranged in a circumferential direction; wherein the open grooves 1531, the inner ring 152 and the outer ring 154 form the clamping grooves 151, which is simple in structure and convenient to assemble.

[0060] Specifically, the matching mode of the open grooves 1531 and the clamping protrusions 122 can be clearance fit, so that the size of the open grooves 1531 is slightly larger than the size of the clamping protrusions 122.

[0061] Preferably, the shape of the clamping protrusion 122 can be circular, and the diameter of the clamping protrusion 122 is larger than the width of the connecting rod 121.

[0062] Specifically, the inner ring 152, the middle ring 153 and the outer ring 154 can be connected together by means of glue bonding, laser welding and the like.

[0063] Specifically, the clamping protrusion 122 can also be fixed in the clamping groove 151 by means of glue bonding, laser welding, etc.

[0064] In the embodiment, referring to Figures 9 to 11 As shown in the figure, the two ends of the filter screen 130 are fixedly connected with the thrombus extraction stent 120, and the middle part of the filter screen 130 is in a free form. The filter screen 130 can be fixedly connected with the thrombus extraction stent 120 while being in a free and loose form to the greatest extent. The shape of the filter screen 130 can change with the shape of the thrombus 300, and the thrombus 300 wrapped by the filter screen 130 can be squeezed into the thrombus extraction stent 120, effectively avoiding the filter screen 130 excessively squeezing the thrombus 300 and hindering the movement of the thrombus extraction assembly in the blood vessel 200. The thrombus extraction cavity 131 formed by the filter screen 130 and the wall of the blood vessel 200 has a good effect of wrapping the thrombus 300, further preventing the detached and broken thrombus 300 from separating from the thrombus extraction cavity 131. In the embodiment, the filter screen 130 has small mesh holes, which can maximally prevent the broken thrombus 300 from separating from the thrombus extraction cavity 131, and the filter screen 130 can be deformed with the embedding of the thrombus 300 to make the thrombus extraction cavity 131 formed by the filter screen 130 and the wall of the blood vessel 200 have a better effect of wrapping the thrombus 300.

[0065] Specifically, the filter screen 130 can be connected with the thrombus extraction stent 120 by means of glue bonding, hot melt welding, etc.

[0066] Specifically, continuing to refer to Figure 9 As shown in the figure, the filter screen 130 can be formed by laser punching of a medical polymer film material. Specifically, continuing to refer to Figure 10 As shown in the figure, the filter screen 130 can also be woven from a wire material. Of course, the filter screen 130 can also be of other materials, which are not limited herein.

[0067] It is worth mentioning that, continuing to refer to Figure 11 As shown in the figure, the filter screen 130 can be heat set into a dumbbell shape or an hourglass shape, etc.

[0068] Exemplarily, the method for using the thrombus extraction device includes the following steps:

[0069] S100, inserting the guide wire 400 from the proximal end of the blood vessel 200 and penetrating through the thrombus 300 at the distal end of the blood vessel 200.

[0070] S200, placing the thrombus extraction assembly in the guide catheter 500 and sleeving the inner tube 140 on the proximal end of the guide wire 400, and simultaneously pushing the push rod 110 and the guide catheter 500 to make the guide catheter 500 and the thrombus extraction stent 120 penetrate through the thrombus 300.

[0071] Specifically, between the step S100 and the step S200, the suction catheter 600 can be inserted into the blood vessel 200 along the guide wire 400, the guide catheter 500 and the thrombectomy assembly are moved into the suction catheter 600 and then pass through the thrombus 300 after the distal end of the suction catheter 600 is pulled out, and the suction catheter 600 is used to recover the thrombectomy stent 120, the filter screen 130 and the thrombus 300.

[0072] S300, the guide catheter 500 is moved towards the proximal end of the blood vessel 200 to make the thrombectomy stent 120 expand to an expanded state.

[0073] Specifically, the thrombectomy stent 120 is expanded to hold open the filter screen 130, and the thrombus 300 is placed in the thrombectomy cavity 131.

[0074] S400, the guide catheter 500 is withdrawn from the body, and the push rod 110 is withdrawn to pull the thrombectomy stent 120, the filter screen 130 and the thrombus 300 into the suction catheter 600 together, so as to take out the thrombus 300 from the body.

[0075] In the embodiment, the thrombectomy device combines the characteristics of the thrombectomy stent 120 and the distal protection, which can not only take out the thrombus from the body, but also protect the downstream blood vessel 200, and the thrombectomy device has simple structure and convenient operation, which greatly reduces the operation time.

[0076] Embodiment Two

[0077] The fixing ring 150 in the thrombectomy device provided in the embodiment is different from that in the first embodiment. In the embodiment, referring to FIG. 2, the fixing ring 150 is integrally formed with the connecting rod 121. Figure 12

[0078] Specifically, the thrombectomy stent 120, the connecting rod 121 and the fixing ring 150 can be formed by laser cutting of a pipe and then heat setting, and the production process is simple. In the embodiment, the material of the pipe can be a memory alloy. Preferably, the material of the pipe can be a nickel-titanium alloy.

[0079] Further, the fixing ring 150 can be fixedly connected with the inner tube 140 by welding, adhesive bonding or the like.

[0080] It is worth mentioning that the connection mode of the fixing ring 150 and the inner tube 140 can also be that the two ends of the fixing ring 150 are provided with limiting protrusions on the outer sidewall of the inner tube 140, so as to prevent the fixing ring 150 from sliding along the axis direction of the inner tube 140.

[0081] The other structures of the thrombectomy device provided in the embodiment are the same as those in the first embodiment, and will not be described in detail here.

[0082] ​Obviously, the above embodiments of the present application are merely exemplary but not intended to limit the embodiments of the present application. Various obvious changes, re-adjustments and substitutions can be made by those skilled in the art without departing from the scope of the present application. It is not necessary or possible to enumerate all the embodiments. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the claims of the present application.

Claims

1. A thrombus removal device, characterized in that, The assembly includes a thrombectomy component, which comprises a push rod (110), a thrombectomy bracket (120), and a filter screen (130); wherein, The push rod (110) is connected to the thrombectomy stent (120), and the push rod (110) can drive the contracted thrombectomy stent (120) to penetrate the thrombus (300) in the blood vessel (200). The filter (130) covers the thrombectomy stent (120), and the thrombectomy stent (120) can be expanded and open the filter (130) so that the two ends of the filter (130) fit against the inner wall of the blood vessel (200) to form a thrombectomy cavity (131) to accommodate the thrombus (300). The thrombectomy assembly further includes an inner tube (140) and a fixing ring (150). The proximal end of the inner tube (140) is connected to the distal end of the push rod (110). The distal end of the inner tube (140) passes through the thrombectomy bracket (120). The fixing ring (150) is sleeved on the inner tube (140) and can fix the proximal end of the thrombectomy bracket (120) to the inner tube (140). The proximal end of the thrombectomy bracket (120) is provided with a plurality of connecting rods (121), and the end of the connecting rods (121) is provided with a snap-fit ​​protrusion (122). The fixing ring (150) is provided with a plurality of snap-fit ​​grooves (151) that correspond one-to-one with the snap-fit ​​protrusions (122) along the circumferential direction. The snap-fit ​​protrusions (122) and the snap-fit ​​grooves (151) snap together to realize the fixed connection between the thrombectomy bracket (120) and the fixing ring (150). The retaining ring (150) includes: Inner ring (152), the inner ring (152) is sleeved on the inner tube (140); The middle ring (153) is sleeved on the inner ring (152), and the middle ring (153) is provided with a plurality of opening slots (1531) at intervals along the circumference. Outer ring (154), the outer ring (154) being sleeved on the middle ring (153); wherein, The snap-fit ​​groove (151) is formed between the opening groove (1531), the inner ring (152) and the outer ring (154). The two ends of the filter screen (130) are fixedly connected to the bolt holder (120), and the middle part of the filter screen (130) is free-form.

2. The thrombectomy device according to claim 1, characterized in that, The thrombectomy device further includes a guide wire (400) that can be inserted into the inner tube (140) and is configured to guide the movement of the inner tube (140) toward the thrombus (300).

3. The thrombectomy device according to claim 2, characterized in that, The distal end of the inner tube (140) is provided with a tip (141), which can assist the thrombectomy assembly in penetrating the thrombus (300).

4. The thrombectomy device according to claim 1, characterized in that, The thrombectomy bracket (120) is made of shape memory alloy tubing laser-cut or woven wire.

5. The thrombectomy device according to claim 1, characterized in that, The filter screen (130) is made of polymer membrane material by laser perforation or woven from filament material.

6. The thrombectomy device according to claim 1, characterized in that, It also includes a guide tube (500), the thrombectomy assembly can be disposed in the guide tube (500), and the thrombectomy bracket (120) is retracted in the guide tube (500).

7. The thrombectomy device according to claim 1, characterized in that, The distal end of the thrombectomy bracket (120) is provided with a radiopaque marker (1231).

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