Thrombectomy device
The thrombus removal device, with its woven mesh structure and adjustable limiter, solves the problems of stent displacement and thrombus escape, achieving precise capture and safe retrieval of thrombi. It adapts to different vascular environments and reduces vascular damage.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- APT MEDICAL HUNAN INC
- Filing Date
- 2025-07-16
- Publication Date
- 2026-07-14
AI Technical Summary
Existing thrombectomy stents are prone to displacement during deployment, and thrombi can easily escape. They are also difficult to adapt to different vascular environments, which may lead to vascular damage and re-embolism.
A thrombus removal device was designed, which adopts a braided mesh structure. The braided mesh is slidably connected to the push guidewire. The radial force is adjusted by a limiter to adapt to different blood vessel shapes and avoid displacement and thrombus escape.
It achieves precise capture and safe removal of thrombi, reduces vascular damage, adapts to various vascular environments, and avoids re-embolism.
Smart Images
Figure CN224484100U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of medical device technology, specifically a thrombus removal device. Background Technology
[0002] Thrombosis is one of the main pathological bases for cardiovascular and cerebrovascular diseases and peripheral vascular diseases (such as myocardial infarction, ischemic stroke, pulmonary embolism, deep vein thrombosis, and peripheral arterial embolism). These diseases are characterized by high incidence, high disability rate, and high mortality rate, seriously threatening human health. The key to treating acute thrombosis lies in acute vascular revascularization. Currently, treatment methods are divided into two types: pharmacolytic thrombolysis and mechanical thrombectomy. Because pharmacolytic thrombolysis has a short treatment window and is only suitable for small thrombi, its treatment effect on large thromboembolic thrombi is not ideal. Therefore, only about 3-5% of patients are suitable for pharmacolytic thrombolysis. Mechanical thrombectomy involves delivering a thrombectomy device to the lesion site and then removing the thrombus through a sheath. The most widely used and frequently applied method is the thrombectomy stent. The disadvantages of existing thrombectomy stents are as follows: (1) When the thrombectomy stent is delivered to the lesion site through a microcatheter and the microcatheter is released from the microcatheter, the microcatheter and the thrombectomy stent may shift, and the position of the thrombectomy stent cannot be precisely controlled, resulting in poor thrombectomy effect; (2) After thrombectomy, during the stent retraction process, the cut thrombus is prone to fragmentation and escape, running to the distal end of the blood vessel and causing re-embolism; (3) For relatively small and curved blood vessel segments such as cardiovascular, intracranial blood vessels and lower limb blood vessels, the stent has insufficient resistance to compression when retracting through the curved blood vessel, and the stent structure is prone to collapse, causing thrombus escape and causing re-embolism; (4) Thrombectomy stents use the radial cutting and interlocking of the metal mesh to capture and pull the thrombus, which requires the thrombectomy stent itself to have sufficient radial force to support it. However, in different vascular environments, this radial force cannot be adjusted according to actual needs, so it is easy to cause vascular damage and complications during the thrombus pulling process. To address the aforementioned shortcomings, the development of thrombectomy devices should aim to restore blood vessel patency as quickly as possible while protecting vascular cells, avoiding damage to the vessel wall, and minimizing the long-term effects on patients. Utility Model Content
[0003] To address the aforementioned problems in existing technologies, the purpose of this invention is to provide a thrombus removal device that avoids the easy displacement of thrombectomy stents and microcatheters during release. The woven mesh design captures any thrombi that fall during thrombectomy, preventing thrombus escape. The radial force of the thrombus removal device can be adjusted according to the hardness of the thrombus and the diameter of the blood vessel. The thrombus removal process does not cause vascular damage. In small and tortuous blood vessels, the woven mesh can be stretched to adapt to various vessel shapes, enabling delivery through small-diameter microcatheters.
[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows:
[0005] A thrombus removal device includes a guidewire and a braid. The braid is a three-dimensional mesh structure woven from multiple metal wires. The braid extends and changes diameter along the axial direction of the guidewire. One end of the braid is slidably disposed on the proximal side of the distal end of the guidewire, and the other end of the braid is fixed on the distal side of the guidewire. The two ends of the braid can move relative to each other, allowing the braid to switch between a first configuration and a second configuration. In the first configuration, the unfolded diameter of the braid is smaller than that in the second configuration.
[0006] As a further improvement to the above technical solution:
[0007] In the first configuration, the braid can be gathered in a delivery catheter, which can transport the braid to a target location in the blood vessel. In the second configuration, the unfolded diameter of the braid is greater than that of the braid in the first configuration.
[0008] The unfolded diameter refers to the maximum diameter of the cross-section of the braid in the corresponding state.
[0009] The thrombus removal device also includes a limiter for limiting the relative range of movement between the two ends of the braid. The limiter is fixedly installed on the push guide wire and located between the two ends of the braid. The limiter limits the relative range of movement between the two ends of the braid by preventing the slidable end of the braid from continuing to slide towards the other end, or the limiter also prevents the other end of the braid from moving at the same time.
[0010] The limiter includes a retaining ring, which is fixedly sleeved on the push guide yarn. The retaining ring is located between the two ends of the braid. When the slidable end of the braid slides to contact the retaining ring, the retaining ring prevents that end of the braid from continuing to slide in the same direction.
[0011] The limiter also includes a spring, which is sleeved outside the push guide wire. One end of the spring is fixedly connected to the fixing ring, and the other end is fixedly connected to or only contacts the fixed end of the braid.
[0012] One end of the braid is movably sleeved onto the push guide wire through a movable sleeve, and the other end is fixed onto the push guide wire through a fixed sleeve.
[0013] The fixed sleeve and the movable sleeve are fixedly connected to both ends of the braid in the axial direction. The fixed sleeve is fixedly sleeved on the push guide wire, and the movable sleeve is movably sleeved on the push guide wire. The push guide wire passes through the fixed sleeve and the movable sleeve.
[0014] The fixed sleeve and the movable sleeve have the same structure, both including an outer tube and an inner tube that are coaxially connected. One end of the braid is fixed between the outer tube and the inner tube of the movable sleeve, and the other end of the braid is fixed between the outer tube and the inner tube of the fixed sleeve.
[0015] The thrombus removal device also includes a distal spring, which is sleeved on the distal end of the guidewire. The distal end of the distal spring and the distal end of the guidewire are fixedly connected to form a smooth guidewire tip.
[0016] One fixed end of the braid is located between the limiter and the distal spring. The end of the distal spring away from the limiter is fixed to the push guide wire, while the other end is fixed or not fixed relative to the push guide wire.
[0017] The diameter of the braided yarn is 0.02-0.2mm.
[0018] The beneficial effects of this utility model are:
[0019] (1) The thrombus removal device is delivered to the distal end of the thrombus in the blood vessel via a microcatheter. After the microcatheter is withdrawn and released, the guidewire is pulled back to remove the thrombus from the distal end to the proximal end. The braided metal wires are not fixed and can move relative to each other. At the same time, the positions of the two ends of the braid can move relative to each other. Therefore, the thrombus removal device can be easily loaded into the microcatheter and delivered through the microcatheter without excessive delivery resistance caused by excessive radial force when the braid is compressed. Excessive delivery resistance can easily cause relative displacement between the thrombus removal device and the microcatheter during release. Therefore, the problem of displacement of the thrombectomy stent and the microcatheter during release can be avoided.
[0020] (2) The thrombus removal device is designed as a woven mesh bag, which covers the entire diameter of the blood vessel. Thrombi that fall off during the thrombus removal process will be captured by the mesh bag and will not escape.
[0021] (3) Since one end of the braid is slidably set relative to the push guide wire, the radial force of the thrombus removal device can be adjusted according to the hardness of the thrombus and the diameter of the blood vessel. That is, after the braid captures the thrombus, its maximum unfolding diameter is limited by the inner diameter of the blood vessel. During the pulling process, it will be subject to the resistance of the thrombus to adjust its unfolding diameter, so that the process of pulling the thrombus will not cause damage to the blood vessel.
[0022] (4) The braided mesh structure design and radial shrinkable combined with the sliding setting of the guide wire at one end of the braided body allow the braided body to be stretched in small and tortuous blood vessels to adapt to various blood vessel shapes, effectively preventing thrombus escape.
[0023] (5) The braided metal wires of the thrombus removal device are not fixed and can move relative to each other. At the same time, the positions of the two ends of the braid can move relative to each other, and the diameter and number of strands of the braided wires can be adjusted. It can be delivered through a small-sized microcatheter and is suitable for thrombus removal in many blood vessels, including intracranial blood vessels.
[0024] (6) The guide wire tip, which consists of the distal end of the guide wire and the distal spring, is soft and smooth, which can effectively prevent damage to blood vessels and ensure that the device can smoothly enter tortuous blood vessels.
[0025] (7) The braided body has a woven mesh structure and no sharp points, which can avoid damaging blood vessels. Furthermore, by setting different lengths of the spring of the limiter, the maximum diameter of the braided body in the second configuration can be adjusted, thereby configuring products suitable for different blood vessels. Attached Figure Description
[0026] Figure 1 This is a structural schematic diagram of one embodiment of the present invention.
[0027] Figure 2 This is a schematic diagram of the structure of the braided body in the second configuration according to an embodiment of the present invention.
[0028] Figure 3 yes Figure 2 Another perspective structural diagram.
[0029] Figure 4 This is a schematic diagram of another form of the braided body in a second configuration according to one embodiment of the present invention.
[0030] Figure 5 yes Figure 4 Another perspective structural diagram.
[0031] Figure 6 This is one embodiment of the present invention where the knitted body is in the position of Figure 4 A structural diagram of the state.
[0032] Figure 7 This is a schematic diagram of a fixed sleeve or movable sleeve structure according to an embodiment of the present invention.
[0033] Figure 8 yes Figure 7 Another perspective structural diagram.
[0034] Figure 9 This is a schematic diagram of the limiter structure according to an embodiment of the present invention.
[0035] Figure 10 This is a schematic diagram of the structure of a guide wire head formed by the cooperation of the distal spring and the push guide wire head end in one embodiment of this utility model.
[0036] Figure 11 This is a schematic diagram of the thrombus removal device of one embodiment of the present invention reaching the distal end of the thrombus.
[0037] Figure 12 This is a schematic diagram of the thrombus removal device according to an embodiment of the present invention when pulling out a thrombus.
[0038] Reference numerals: 1. Guidewire, 2. Limiter, 21. Fixation ring, 22. Spring, 3. Braided body, 31. Fixed cannula, 32. Movable cannula, 321. Outer tube, 322. Inner tube, 4. Distal spring, 5. Microcatheter, A. Target thrombus. Detailed Implementation
[0039] The specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the scope of this utility model.
[0040] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.
[0041] A thrombus removal device, such as Figure 1 As shown, it includes a pusher wire 1, a limiter 2, and a braid 3.
[0042] The braided body 3 is used to contact the thrombus A within the blood vessel and push the thrombus A out. The braided body 3 is as follows: Figures 2-5 As shown, the braided body 3 is a three-dimensional mesh structure woven from multiple metal wires. It is a rotating or similar metal mesh structure, which makes the entire braided body 3 elastic and capable of deforming in the radial and axial directions.
[0043] In this embodiment, the braided body 3 is divided into two parts along the axial direction. One part has a relatively dense mesh structure, which can maximize the containment and capture of thrombi and prevent thrombus escape. The other part has a sparse mesh structure, which can play a good transition role. The mesh diameter of the braided body 3 ranges from 50 to 200 μm, blocking thrombi while allowing blood flow.
[0044] Based on the above structure, in the first configuration, the braid 3 can be gathered in the delivery conduit, which is a micro-conduit, etc., and the braid 3 forms the second configuration after exiting the delivery conduit. Obviously, the unfolded diameter of the braid 3 in the first configuration is smaller than that in the second configuration. In the first configuration, the braid 3 is subjected to radial compression, and at this time, the braid 3 has a relatively slender rugby ball shape. In the second configuration, the braid 3 may be unaffected by external force, subjected to axial compression, or subjected to radial compression. When the braid 3 is unaffected by external force, the braid 3 has a rugby ball-like shape; when the braid 3 is subjected to axial compression, the braid 3 becomes shorter and thicker, resembling a structure of two "short and stout" cones symmetrically connected together, such as... Figures 4-6 As shown. Because the braid 3 has a rotating shape and its structure is elastic, it can be ensured that when the braid 3 is configured in the second way, the unfolded diameter can be increased to the point where the cross-section at the maximum diameter can fit the inner wall of the blood vessel, thus preventing the escape of thrombi to the greatest extent.
[0045] The braided body 3 extends and changes diameter along the axial direction of the push guide wire 1, meaning the push guide wire 1 passes through the braided body 3 axially. One end of the braided body 3 is fixed to the push guide wire 1 via a fixed sleeve 31, and the other end is movably sleeved on the push guide wire 1 via a movable sleeve 32. In other words, the fixed sleeve 31 and the movable sleeve 32 are respectively connected to the two ends of the braided body 3 in the axial direction. The movable sleeve 32 includes an outer tube 321 and an inner tube 322 coaxially sleeved together, such as... Figure 7 and 8 As shown, one end of the braided body 3 is fixed between the outer tube 321 and the inner tube 322. The structure of the fixed sleeve 31 is the same as that of the movable sleeve 32, and the other end of the braided body 3 is fixed between the outer tube 321 and the inner tube 322 of the fixed sleeve 31. The outer tube 321 of the movable sleeve 32 and the outer tube 32 of the fixed sleeve 31 are provided with radiopaque markings, which are marks that can be detected by X-rays, making it easy to track the position of the braided body 3 inside the human body.
[0046] As described above, the guide wire 1 passes through the movable sleeve 32, the fixed sleeve 31, and the braid 3. The inner tube 322 of the movable sleeve 32 is slidably fitted onto the guide wire 1, and the inner tube 322 of the fixed sleeve 31 is fixed onto the guide wire 1. Therefore, one end of the braid 3 connected to the movable sleeve 32 can slide along the guide wire 1, while the other end of the braid 3 connected to the fixed sleeve 31 is fixed relative to the guide wire 1, thereby allowing the two ends of the braid 3 to move relative to each other. When the two ends of the braid 3 approach each other, the radial dimension of the braid 3 increases; when the two ends of the braid 3 move away from each other, the radial dimension of the braid 3 decreases. Preferably, the end of the braid 3 with a relatively sparse mesh is connected to the movable sleeve 32.
[0047] Limiter 2 Figure 9As shown, the device includes a retaining ring 21 and a spring 22. The retaining ring 21 is fixedly sleeved on the push guide wire 1 and is located between the two ends of the braided body 3, namely between the fixed sleeve 31 and the movable sleeve 32. The spring 22 is sleeved on the outside of the push guide wire 1, with one end of the spring 22 fixedly connected to the retaining ring 21 and the other end connected to the fixed sleeve 31. The end of the spring 22 away from the retaining ring 21 can be fixedly connected to the fixed sleeve 31 or not. The limiter 2 simultaneously limits the sliding displacement of the movable sleeve 32 and the movement of the fixed sleeve 31. When the movable sleeve 32 slides to contact the retaining ring 21, the movable sleeve 32 cannot continue to move towards the fixed sleeve 31.
[0048] A distal spring 4 is installed on the push guide wire 1, and a fixing sleeve 31 is located between the distal spring 4 and the spring 22. The distal spring 4 is fitted onto the push guide wire 1, and the distal end of the distal spring 4 is fixedly connected to the distal end of the push guide wire 1 to form a guide wire head, as shown below. Figure 10 As shown, the guidewire tip is smoothly rounded and flexible, making it easy for the device to smoothly enter curved blood vessels without damaging the vessel wall.
[0049] As shown above, the end of the braided body 3 with a denser mesh is closer to the far end of the spring 4 than the other end.
[0050] It should be noted that the terms "proximal" and "distal" are commonly used in the field of interventional medical devices. Specifically, "proximal" refers to the end closer to the operator during the procedure, while "distal" refers to the end farther from the operator during the procedure.
[0051] The guide wire 1 can be made of stainless steel wire, nickel-titanium wire, or a combination of stainless steel wire and nickel-titanium wire.
[0052] The springs 22 and 4 are made of gold-plated tungsten wire, platinum wire, platinum-tungsten wire, or gold wire, and have good reflectability. The length of the 4 distal spring is 1-5cm. The length of the spring 22 of the limiter 2 is 1-10cm, depending on the size of the metal basket.
[0053] The retaining ring 21 of the limiter 2 is made of stainless steel or platinum or platinum-iridium material with a developing effect.
[0054] The braided body 3 is a braided structure, which can be made by woven nickel-titanium wire, platinum or platinum-tungsten or platinum-core nickel-titanium wire and nickel-titanium wire composite. The wire diameter of the metal mesh ranges from 0.02 to 0.2 mm, and the number of braids ranges from 18 to 72.
[0055] The outer tube 321 of both the fixed sleeve 31 and the movable sleeve 32 is made of platinum or platinum-iridium material, providing excellent imaging properties. The inner tube 322 is made of stainless steel.
[0056] The manufacturing process of the thrombectomy device is briefly described as follows: The braided body 3 is made into a mesh tube shape by a braiding process, and then formed by a heat setting process using a mold. After the mesh basket is formed, one end of the mesh basket is placed between the outer tube 321 and the inner tube 322 of the fixed sleeve 31, and the other end is placed between the outer tube 321 and the inner tube 322 of the movable sleeve 32. Then, the mesh basket is fixedly connected to the movable sleeve 32 and the fixed sleeve 31 by brazing, laser welding or plasma welding to form a complete braided body. The distal end of the push guide wire 1 is tapered by a grinding process. The tip of the push guide wire 1 is inserted into the center of the inner tube 322 of the movable sleeve 32. After the fixing ring 21 and the spring 22 of the limiter 2 are fitted, the tip of the push guide wire 1 is inserted into the center of the inner tube 322 of the fixed sleeve 31, completing the assembly of the push guide wire 1 and the braided body 3. Leave the distal grinding section of the push guide wire 1 exposed. After inserting the distal spring 4, use brazing, laser welding, or plasma welding to weld one or both ends of the distal spring 4 to the push guide wire 1. Push the fixing sleeve 31 against the distal spring 4, then push the spring 22 of the limiter 2 to the fixing sleeve 31. After welding the fixing ring 21 to the spring 22, weld the proximal end of the fixing ring 21 to the push guide wire 1 to complete the assembly of the thrombectomy device.
[0057] Based on the above structure, the working principle and process of this utility model are as follows: The braided body 3 is initially unaffected by external force and is in the second configuration. The braided body 3 is pushed into the microcatheter 5. During the pushing process, the braided body 3 experiences frictional resistance from the catheter wall, causing the movable sleeve 32 to slide proximally. The braided body 3 then elongates, converting to the first configuration, thus facilitating the delivery of the thrombus removal device to the distal end of the target thrombus A using the small-sized microcatheter 5. When the microcatheter 5 carries the thrombus removal device through thrombus A and reaches the distal end of the target thrombus A, the guidewire 1 is fixed, the microcatheter 5 is retracted, and the braided body 3 exits from the microcatheter 5 and enters the blood vessel. The braided body 3 returns to its initial state when unaffected by external force. Figure 11 As shown in the figure, in this embodiment, the unfolded diameter of the braided body 3 when not subjected to external force is slightly smaller than the inner diameter of the inserted blood vessel. Then, the guidewire 1 is pulled back. During the pullback process, the movable sleeve 32 contacts the target thrombus A and is resisted by the target thrombus A, causing the movable sleeve 32 to slide distally along the guidewire 1. The distal end of the braided body 3 and the fixed sleeve 31 are restricted by the limiter 2 and cannot slide, causing the braided body 3 to be squeezed by the movable sleeve 32. The proximal end of the braided body 3 expands, as shown in the figure. Figure 12As shown. The distal braid 3 can catch detached thrombi and intermediate thrombi, pulling the thrombus out of the body from distal to proximal. During the process, the guidewire 1 provides support for the delivery and retraction of the braid 3. It should be noted that when the target thrombus A is small, the braid 3 experiences less resistance and less deformation; when the target thrombus A is sufficiently small, the braid 3 may not even deform. However, when the target thrombus A is large, the braid 3 experiences greater resistance and can deform to conform to the vessel wall, making it easier to scrape off the thrombus attached to the vessel wall. When the braid 3 conforms to the vessel wall, the radial pressure exerted by the vessel wall on the braid 3 also adjusts the sliding position of the movable cannula 32, thereby adjusting the expansion shape of the braid 3. In this process, the radial force of the braid 3 adjusts according to the vascular environment, thereby reducing damage to the vessel wall during thrombus removal.
[0058] It should be noted that the braided body 3 can take many different forms and is not limited to the structure of this scheme.
[0059] Finally, it is necessary to state that the above embodiments are only used to further illustrate the technical solution of this utility model in detail, and should not be construed as limiting the scope of protection of this utility model. Any non-essential improvements and adjustments made by those skilled in the art based on the above content of this utility model shall fall within the scope of protection of this utility model.
Claims
1. A thrombus removal device, characterized in that, It includes a push guide wire (1) and a braid (3). The braid (3) is a three-dimensional mesh structure woven from multiple metal wires. The braid (3) extends and changes diameter along the axial direction of the push guide wire (1). One end of the braid (3) is slidably disposed on the proximal side of the distal end of the push guide wire (1), and the other end of the braid (3) is fixed on the distal side of the distal end of the push guide wire (1). The two ends of the braid (3) move relative to each other, so that the braid (3) can switch between a first configuration and a second configuration. In the first configuration, the unfolded diameter of the braid (3) is smaller than that in the second configuration.
2. The thrombus removal device according to claim 1, characterized in that: In the first configuration, the braid (3) can be gathered in the delivery catheter, which can transport the braid (3) to the target location in the blood vessel. In the second configuration, the unfolded diameter of the braid (3) is greater than the unfolded diameter of the braid (3) in the first configuration.
3. The thrombus removal device according to claim 1, characterized in that: The thrombus removal device also includes a limiter (2) for limiting the relative movement range of the two ends of the braid (3). The limiter (2) is fixedly installed on the push guide wire (1) and located between the two ends of the braid (3). The limiter (2) limits the relative movement range of the two ends of the braid (3) by preventing one slidable end of the braid (3) from continuing to slide to the other end, or the limiter (2) also prevents the other end of the braid (3) from moving at the same time.
4. The thrombus removal device according to claim 3, characterized in that: The limiter (2) includes a retaining ring (21), which is fixedly sleeved on the push guide wire (1). The retaining ring (21) is located between the two ends of the braid (3). When the slidable end of the braid (3) slides to contact the retaining ring (21), the retaining ring (21) prevents that end of the braid (3) from continuing to slide in the same direction.
5. The thrombus removal device according to claim 4, characterized in that: The limiter (2) also includes a spring (22), which is sleeved on the outside of the push guide wire (1). One end of the spring (22) is fixedly connected to the fixing ring (21), and the other end is fixedly connected to or only contacts the fixed end of the braid (3).
6. The thrombus removal device according to any one of claims 1 to 5, characterized in that: One end of the braided body (3) is movably sleeved on the push guide wire (1) through the movable sleeve (32), and the other end is fixed on the push guide wire (1) through the fixed sleeve (31).
7. The thrombus removal device according to claim 6, characterized in that: The fixed sleeve (31) and the movable sleeve (32) are respectively fixedly connected to the two ends of the braid (3) in the axial direction. The fixed sleeve (31) is fixedly sleeved on the push guide wire (1), and the movable sleeve (32) is movably sleeved on the push guide wire (1). The push guide wire (1) passes through the fixed sleeve (31) and the movable sleeve (32).
8. The thrombus removal device according to claim 7, characterized in that: The fixed sleeve (31) and the movable sleeve (32) have the same structure, both including an outer tube (321) and an inner tube (322) that are coaxially connected. One end of the braided body (3) is fixed between the outer tube (321) and the inner tube (322) of the movable sleeve (32), and the other end of the braided body (3) is fixed between the outer tube (321) and the inner tube (322) of the fixed sleeve (31).
9. The thrombus removal device according to any one of claims 3 to 5, characterized in that: The thrombus removal device also includes a distal spring (4), which is sleeved on the distal side of the push guidewire (1). The distal end of the distal spring (4) and the distal end of the push guidewire (1) are fixedly connected to form a smooth guidewire head.
10. The thrombus removal device according to claim 9, characterized in that: One fixed end of the braid (3) is located between the limiter (2) and the distal spring (4). The end of the distal spring (4) away from the limiter (2) is fixed on the push guide wire (1), and the other end is fixed or not fixed relative to the push guide wire (1).