A thrombectomy system

Abstract

The application provides a thrombus taking system, and relates to the technical field of medical devices.The thrombus taking system comprises a thrombus taking device and a distal protection device.The thrombus taking device comprises a thrombus taking module and a guide extending along the length direction of a blood vessel.The thrombus taking module comprises a thrombus taking stent and a first connecting ring.The thrombus taking stent is sleeved on the guide.The thrombus taking stent comprises a stent catching net and a stent collecting end connected in a head-to-tail mode.The stent collecting end is fixedly connected with the first connecting ring, and the first connecting ring is sleeved on the guide.The distal protection device comprises a device framework, a braided wire and a third connecting ring.The device framework is sleeved on the guide.The device framework is wound with the braided wire.The braided wire is gathered on the third connecting ring.The third connecting ring is sleeved on the guide, and the opening of the distal protection device is opposite to the opening of the thrombus taking stent.The system realizes structure improvement through the split design of the thrombus taking device and the distal protection device, improves the working flexibility, and provides convenience for thrombus taking operation.

Description

[0001] This application is a divisional application of a patent application entitled "A thrombectomy system and thrombectomy method", the original application was filed on July 13, 2022, and the application number is 202210818077.4. Technical Field

[0002] This invention relates to the field of medical device technology, and in particular to a thrombectomy system. Background Technology

[0003] Pulmonary embolism is a potentially life-threatening condition. Acute pulmonary embolism can lead to systemic hypotension and even heart failure, ultimately causing death. It is one of the three leading causes of cardiovascular death, alongside myocardial infarction and stroke. The most common embolus in pulmonary embolism is a thrombus. Current treatment methods include pulmonary endarterectomy, thrombectomy, catheter-directed thrombolysis, and mechanical thrombectomy. Among these, mechanical thrombectomy, which removes the thrombus through fragmentation, aspiration, stenting, or basket retrieval, has become a hot research topic in recent years. The mechanical thrombectomy technique involves expanding a stent and embedding it with the thrombus, then pulling the thrombus into the aspiration catheter and using a suction device to remove it from the body.

[0004] However, current thrombectomy devices primarily involve embedding a stent in the thrombus and then removing the stent and thrombus together through a catheter. However, difficulties in adjusting the position between the thrombectomy device and the distal protection device increase the complexity of the thrombectomy process and reduce its efficiency. Summary of the Invention

[0005] In order to overcome the shortcomings of the prior art, the purpose of this invention is to provide a thrombectomy system to improve the working flexibility of the thrombectomy system and facilitate the thrombectomy operation.

[0006] To achieve the above objectives, the present invention provides the following solution:

[0007] A thrombectomy system, capable of being placed within a blood vessel (910), includes:

[0008] The thrombectomy device (100) includes a guide and a thrombectomy module, and a push rod (400), a guide tube (500) and a suction catheter (600) arranged sequentially from the inside to the outside. The guide extends along the length of the blood vessel (910). The thrombectomy module includes a thrombectomy stent (110) and a first connecting ring (140). The thrombectomy stent (110) is sleeved on the guide. The thrombectomy stent (110) includes a stent trap (112) connected end to end and a stent convergence end (113). The stent convergence end (113) is fixed to the first connecting ring (140). The first connecting ring (140) is sleeved on the guide.

[0009] The remote protection device (200) includes a device frame (210) connected end to end, braided wire (220) and a third connecting ring (230). The device frame (210) is sleeved on the guide member. One end of the device frame (210) is wound with the braided wire (220). The braided wire (220) is gathered in the third connecting ring (230). The third connecting ring (230) is sleeved on the guide member. The opening of the remote protection device (200) is directly opposite the opening of the thrombec bracket (110).

[0010] Both the thrombectomy device (100) and the distal protection device (200) can be retracted within the guide tube (500). The end of the guide member away from the distal protection device (200) is fixed to the push rod (400). The thrombectomy catheter (600) is used to retrieve the embolus (920), the distal protection device (200), and the thrombectomy device (100). The guide member includes an inner tube (120) and a guide wire (300), the guide wire (300) passing through... The first connecting ring (140) is sleeved on the inner tube (120), the guide wire (300) passes through the third connecting ring (230) and is connected to the remote protection device (200); the guide member includes an inner rod (150) and a guide wire (300), the guide wire (300) passes through the inner rod (150), and both the first connecting ring (140) and the third connecting ring (230) are sleeved on the inner rod (150).

[0011] Preferably, a first connecting ring (140) and a connected thrombectomy bracket (110) constitute a thrombectomy group, and the thrombectomy group is provided with at least one thrombectomy.

[0012] Preferably, the support net (112) forms a parallelogram grid, which is spirally distributed around the axis of the guide member. The support net (112) can drive the first connecting ring (140) to rotate around the axis of the guide member.

[0013] Preferably, there are two thrombectomy groups, and the parallelogram grids on the two thrombectomy brackets (110) are spiraled in opposite directions around the axis of the guide, so that the rotation directions of the two thrombectomy groups are opposite; the two thrombectomy groups are arranged at intervals along the extension direction of the guide, and the adjacent two thrombectomy groups may have a partial overlap.

[0014] Preferably, the ratio of the length of the long side to the length of the short side of the parallelogram grid is within 1.5-3.

[0015] Preferably, the outer peripheral wall of the guide is provided with a limiting protrusion. When the bolt pick bracket (110) is displaced relative to the guide, the first connecting ring (140) stops at the first connecting ring (140) abutting against the limiting protrusion.

[0016] Preferably, the limiting protrusion is a spherical component.

[0017] Preferably, the device frame (210) includes a frame connecting rod (211) and a frame braiding portion (212) disposed on one side of the frame connecting rod (211). The frame braiding portion (212) forms frame holes (214), which are evenly distributed around the axis of the guide member. The frame braiding portion (212) has braiding holes (213) that are evenly distributed around the frame holes (214). Each braiding filament (220) passes through one of the braiding holes (213) and both ends are fixed to the third connecting ring (230). A frame connector (215) is provided on the other side of the frame connecting rod (211). The skeleton connector (215) is fixed to the fourth connecting ring (240), which is sleeved on the guide member; the skeleton woven part (212) with the skeleton hole (214) evenly distributed around the axis of the guide member is divided into a woven frame. The third connecting ring (230) connected to the woven frame by the woven thread (220), the woven thread (220) connected to the woven frame, and the woven frame form a storage net; the storage net is provided at least one, and the woven frame of the latter storage net is coaxially fixed to the end of the woven frame of the former storage net away from the bolt removal device (100).

[0018] Preferably, the third connecting ring (230) includes a second inner ring (231) and a second outer ring (232) coaxially sleeved on the second inner ring (231), the second inner ring (231) and the second outer ring (232) forming a receiving cavity; both ends of the braided filament (220) are threaded into the receiving cavity.

[0019] According to specific embodiments provided by the present invention, the present invention discloses the following technical effects:

[0020] This invention utilizes a remote protection device to collect and remove detached and broken embolus fragments from the body, preventing downstream vascular blockage. The filter effectively captures the embolus; the design of braided threads wrapped around the device frame ensures a tight connection between the filter and the frame, reducing the risk of damage to the remote protection device. The design of the braided threads gathering at the third connecting ring causes the filter mesh to gradually narrow from the proximal to the distal end of the embolus, thus optimizing the embolus capture effect. The design of the remote protection device and the thrombectomy support opening facing each other allows for complete encirclement of the embolus from both sides, significantly reducing the risk of the embolus detaching from the thrombectomy system. The separate design of the thrombectomy device and the remote protection device improves the thrombectomy operation process, enabling it to cope with complex thrombectomy working environments, greatly improving operational flexibility and efficiency. The design of the third connecting ring fitted onto the guide allows for rapid positioning of the remote protection device and the thrombectomy device, ensuring that the separate structure can still complete the thrombectomy operation smoothly and accurately. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of a thrombectomy system provided in an embodiment of the present invention;

[0023] Figure 2 This is a partial unfolded view of a thrombectomy stent provided in an embodiment of the present invention;

[0024] Figure 3 This is a schematic diagram of another thrombectomy module provided in an embodiment of the present invention;

[0025] Figure 4 This is a schematic diagram of another thrombectomy stent provided in an embodiment of the present invention;

[0026] Figure 5 This is a schematic diagram of the structure of the remote protection device provided in an embodiment of the present invention;

[0027] Figure 6 This is a partial unfolded view of a device skeleton provided in an embodiment of the present invention;

[0028] Figure 7 This is a partial unfolded view of the skeleton braiding part and braiding filaments provided in an embodiment of the present invention;

[0029] Figure 8This is a partial unfolded view of another thrombectomy stent provided in an embodiment of the present invention;

[0030] Figure 9 This is a schematic diagram of the structure of a device frame and a braided mandrel provided in an embodiment of the present invention;

[0031] Figure 10 This is a cross-sectional view of the first connecting ring provided in an embodiment of the present invention;

[0032] Figure 11 This is a cross-sectional view of the first connecting ring provided in an embodiment of the present invention;

[0033] Figure 12 This is a cross-sectional view of the third connecting ring provided in an embodiment of the present invention;

[0034] Figure 13 This is a partial cross-sectional view of a thrombectomy system provided in an embodiment of the present invention;

[0035] Figure 14 This is a cross-section of a blood vessel, an embolus, and a thrombectomy system provided in an embodiment of the present invention. Figure 1 ;

[0036] Figure 15 This is a cross-section of a blood vessel, an embolus, and a thrombectomy system provided in an embodiment of the present invention. Figure 2 ;

[0037] Figure 16 This is a schematic diagram of another thrombectomy system provided in an embodiment of the present invention.

[0038] Explanation of reference numerals in the attached drawings: 100, bolt retrieval device; 110, bolt retrieval bracket; 111, bracket extension end; 112, bracket net; 113, bracket retraction end; 114, bracket connector; 120, inner tube; 121, inner tube protruding ring; 130, opening end; 140, first connecting ring; 141, first inner ring; 142, middle ring; 143, first outer ring; 144, insertion groove; 150, inner rod; 160, inner rod end; 170, second connecting ring; 200, remote protection device. 210. Device skeleton; 211. Skeleton connecting rod; 212. Skeleton braiding part; 213. Braiding hole; 214. Skeleton hole; 215. Skeleton connector; 220. Braiding wire; 230. Third connecting ring; 231. Second inner ring; 232. Second outer ring; 240. Fourth connecting ring; 300. Guide wire; 400. Push rod; 500. Guiding tube; 600. Aspiration catheter; 800. Braided mandrel; 910. Blood vessel; 920. Embolism; 921. Embolism fragments. Detailed Implementation

[0039] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0040] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0041] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0042] The terms "first," "second," "third," and "fourth," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish different objects, not to describe a specific order. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, including a series of steps, processes, methods, etc., is not limited to the steps listed, but may optionally include steps not listed, or may optionally include other steps inherent to these processes, methods, products, or devices.

[0043] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0044] like Figure 1 , Figure 2 , Figure 14 and Figure 15As shown, this embodiment provides a thrombectomy device 100, which can be placed inside a blood vessel 910, including a guide and a thrombectomy module; the guide extends along the length of the blood vessel 910; the thrombectomy module includes a thrombectomy stent 110 and a first connecting ring 140, the thrombectomy stent 110 is sleeved on the guide, the thrombectomy stent 110 includes a stent extension end 111 connected end to end, a stent trap 112 and a stent retraction end 113, the stent retraction end 113 is fixed to the first connecting ring 140, the first connecting ring 140 is sleeved on the guide; the stent trap 112 forms a parallelogram mesh, the parallelogram mesh is spirally distributed around the axis of the guide, the stent trap 112 can drive the first connecting ring 140 to rotate around the axis of the guide.

[0045] This thrombectomy device 100, utilizing the parallelogram grid design on the thrombectomy stent 110, can avoid obstruction of the stent net 112 by the blood vessel 910 during the retraction of the device 100. This allows the thrombectomy stent 110 to adaptively rotate around the guide axis, thereby enhancing its ability to capture the embolus 920, preventing the embolus 920 from dislodging during retraction, and thus improving the efficiency of the thrombectomy operation. Simultaneously, the structural improvements give the thrombectomy stent 110 excellent flexibility and resistance to torque damage, exhibiting good wall adhesion within the curved blood vessel 910 and adapting to blood vessels of different shapes. When encountering resistance during retraction, the thrombectomy stent 110 can also adaptively rotate to automatically avoid the resistance, reducing damage to the blood vessel 910. The above structure offers advantages such as high thrombectomy efficiency, no damage to the blood vessel 910, easy improvement of contrast enhancement, and prevention of embolus 920 dislodging.

[0046] In this embodiment, the extension end 111 of the stent is a rod-shaped member, with one end fixed to the stent net 112; the extension end 111 is provided with at least one component, and by fixing the developing material (developing ring or developing coil) to the extension end 111 of the stent, the developing properties of the stent 110 can be enhanced. The retracting end 113 of the stent is a rod-shaped member, with at least one component, one end fixed to the stent net 112, and the other end inserted into the first connecting ring 140.

[0047] Preferably, the thrombectomy bracket 110 is made of shape memory alloy tubing cut from shape memory alloy tubing, then heat-treated and polished.

[0048] Specifically, the rotation direction of the thrombectomy bracket 110 is determined according to the extension direction of the parallelogram grid.

[0049] In this embodiment, a first connecting ring 140 and a connected thrombectomy bracket 110 constitute a thrombectomy group, and the thrombectomy group is provided with at least one thrombectomy group. The provision of the thrombectomy group helps to improve the thrombectomy capability of the thrombectomy device 100, improves the thrombectomy device 100's ability to capture thrombi 920 of different sizes and shapes, reduces the probability of repeated thrombectomy, and improves the efficiency of the thrombectomy operation.

[0050] like Figure 3 , Figure 14 and Figure 15 As shown, in another embodiment of this invention, two thrombectomy groups are provided. The parallelogram grids on the two thrombectomy brackets 110 are spiraled in opposite directions around the axis of the guide, causing the two thrombectomy groups to rotate in opposite directions. The two thrombectomy groups are arranged at intervals along the extension direction of the guide, and adjacent thrombectomy groups may partially overlap. By limiting the rotation direction of the two thrombectomy groups, the action of the thrombectomy module during retraction can be adjusted, thereby further improving the thrombectomy capability and reducing the risk of thrombus 920 dislodging. In other embodiments of this invention, the two thrombectomy groups rotate in the same direction.

[0051] Continue to refer to Figure 2 Furthermore, the parallelogram grid has a long side and a short side, the ratio of the length of the long side to the length of the short side is greater than a proportional threshold, and the angle between the long side and the short side is within the range of an angle threshold. The above design limits the range of the ratio of the long side to the short side and the range of the angle, thus defining the parallelogram grid. This helps to ensure the adaptive capability of the thrombectomy bracket 110 rotation, thereby enabling the first connecting ring 140 to rotate accurately and effectively.

[0052] In this embodiment, the ratio threshold is 1.1, and the angle threshold range is 60°-120°. Preferably, the ratio of the length of the longer side to the length of the shorter side is within 1.5-3.

[0053] like Figure 4 , Figure 14 and Figure 15 As shown, in other embodiments of this example, a second connecting ring 170 is fixedly connected to the extension end 111 of the stent. The second connecting ring 170 is sleeved on the guide and can move along the length of the blood vessel 910. As the thrombectomy stent 110 is contracted or deployed, the second connecting ring 170 can slide freely. This structure facilitates the delivery of the thrombectomy stent 110 and can avoid damage to the blood vessel 910 by the extension end 111 of the stent.

[0054] like Figure 10 , Figure 11 , Figure 14 and Figure 15As shown, in this embodiment, the first connecting ring 140 includes a first inner ring 141, a middle ring 142, and a first outer ring 143 sequentially nested from the inside out. The middle ring 142 has a through-hole, which is connected to the end face of the middle ring 142. The through-hole, the first inner ring 141, and the first outer ring 143 form a insertion groove 144, and the bracket convergence end 113 is inserted into the insertion groove 144. Specifically, the end of the bracket convergence end 113 away from the bracket net 112 is provided with a bracket connector 114, which extends completely into the insertion groove 144. The first inner ring 141 provides space for the guide to pass through. By using the separate design of the first inner ring 141, the middle ring 142, and the first outer ring 143 to form the insertion groove 144, the processing cost of the first connecting ring 140 is significantly reduced. The above design ensures a stable connection between the support retraction end 113 and the first connecting ring 140, reducing the risk of the retrieval support 110 shifting position or falling off during the retrieval process.

[0055] Preferably, the components on the first connecting ring 140 are cut from metal or polymer tubing.

[0056] In this embodiment, the various components of the connecting ring, as well as the connecting ring and the guide member, can be connected together by means of adhesive bonding, laser welding, or other methods. The specific connection methods are conventional techniques in the art, well-known to those skilled in the art, and will not be elaborated upon here.

[0057] like Figure 13 As shown, in this embodiment, a limiting protrusion is provided on the outer peripheral wall of the guide member. When the thrombectomy bracket 110 is displaced relative to the guide member, the first connecting ring 140 stops at the limiting protrusion. When the thrombectomy bracket 110 is retracted or pushed forward, the limiting protrusion drives the thrombectomy bracket 110 to move by directly contacting the first connecting ring 140 and ensures that the first connecting ring 140 can rotate adaptively, so that the thrombectomy device 100 can operate smoothly and stably.

[0058] Preferably, the limiting protrusion is made of medical metal or polymer material, such as medical stainless steel, nickel-titanium shape memory alloy, cobalt-based alloy, titanium alloy or magnesium alloy, etc. It can also be made of radiopaque material such as gold, platinum, platinum-iridium, platinum-tungsten or tantalum to increase the proximal radiopaqueness of the thrombectomy stent 110. The limiting protrusion is connected to the inner tube 120 by means of adhesive bonding, laser welding or hot melt welding.

[0059] In other embodiments of this example, the limiting protrusion is a spherical part. The above design greatly reduces the contact area between the limiting protrusion and the first connecting ring 140, thereby reducing the rotational resistance of the thrombectomy bracket 110.

[0060] like Figure 1 , Figure 14and Figure 15 As shown, this embodiment also provides a thrombectomy system that can be placed inside a blood vessel 910, including a thrombectomy device 100 and a distal protection device 200; the thrombectomy device 100 includes a guide and a thrombectomy module, and the distal protection device 200 includes a device frame 210 connected end to end, a braided wire 220 and a third connecting ring 230, the device frame 210 is sleeved on the guide, one end of the device frame 210 is wound with the braided wire 220, the braided wire 220 is gathered in the third connecting ring 230, the third connecting ring 230 is sleeved on the guide, and the opening of the distal protection device 200 is directly opposite the opening of the thrombectomy stent 110.

[0061] This thrombectomy system, with the aid of a distal protection device 200, can collect and remove detached and broken embolus fragments 921 from the body, preventing blockage of downstream blood vessels 910. The filter effectively captures the embolus 920. The design of the braided wires 220 wrapped around the device frame 210 ensures a tight connection between the filter and the frame, reducing the risk of damage to the distal protection device 200. The design of the braided wires 220 gathered at the third connecting ring 230 causes the filter mesh to gradually narrow from the proximal end to the distal end of the embolus 920, thereby optimizing the catching effect. The design of the distal protection device 200 and the thrombectomy support 110 opening facing each other allows for complete encirclement of the embolus 920 from both sides, significantly reducing the risk of the embolus 920 detaching from the thrombectomy system. The separate design of the thrombectomy device 100 and the remote protection device 200 improves the thrombectomy operation process of this thrombectomy system, enabling it to cope with complex thrombectomy working environments, greatly improving the flexibility of the work, and also improving the efficiency of the thrombectomy operation; through the design of the third connecting ring 230 sleeved on the guide member, the remote protection device 200 and the thrombectomy device 100 can be quickly positioned, ensuring that the separate structure design can still complete the thrombectomy operation smoothly and accurately.

[0062] This thrombectomy system is compact, and both the distal protection device 200 and the thrombectomy device 100 facilitate improved imaging. The distal protection device 200 has the advantage of good wall adhesion, effectively reducing the risk of damage to the blood vessel 910. The filter has a conical structure, with the mesh size gradually decreasing from the proximal end to the distal end of the thrombus 920, thereby improving the retrieval effect of thrombus fragments 921 of different sizes.

[0063] Specifically, the thickness of the filter screen is 10-1000μm, and the mesh diameter of the filter screen is 10-1000μm.

[0064] like Figure 1 , Figure 5 , Figure 14 and Figure 15As shown, the filter screen separates the device frame 210 from the inner wall of the blood vessel 910. The filter screen surface is smooth, which can reduce the damage of the device frame 210 to the inner wall of the blood vessel 910. The diameter of the braided filaments 220 is 0.05-0.3mm, and the material is medical polymer filament or medical metal filament. The filter screen may contain at least one imaging filament such as platinum-iridium, platinum-tungsten, or platinum, so that the filter screen can be visualized as a whole. The specific material selection method of the filter screen is common knowledge in the art and is well known to those skilled in the art, and will not be described in detail here.

[0065] The above design allows the filter to collect emboli 920 without obstructing blood flow. The device frame 210 is made of medical shape memory alloy tubing cut or wire woven and then heat-treated to shape; the filter is made of medical wire woven or medical membrane material perforated, and the filter can be covered on the outer surface of the device frame 210 by heat melting, bonding, welding or other methods.

[0066] like Figures 5-7 As shown, further, a skeleton connector 215 is provided on the other side of the skeleton connecting rod 211. The skeleton connector 215 is fixed to the fourth connecting ring 240, which is sleeved on the guide member. The fourth connecting ring 240 achieves the positioning effect of the device skeleton 210 and the guide member, further facilitating the positioning of the remote protection device 200 and the thrombectomy device 100, while also preventing the skeleton connecting rod 211 from damaging the blood vessel 910.

[0067] In this embodiment, the device frame 210 includes a frame connecting rod 211 and a frame braiding portion 212 disposed on one side of the frame connecting rod 211. The frame braiding portion 212 forms frame holes 214, which are evenly spaced around the axis of the guide member. The frame braiding portion 212 has braiding holes 213, which are evenly spaced around the frame holes 214. Each braiding wire 220 passes through a braiding hole 213, and both ends are fixed to a third connecting ring 230. Specifically, the braiding holes 213 are laser-cut. The connection structure of the braiding wires 220 on the device frame 210 is simple, has high connection strength, and is not prone to falling off or shifting, thus ensuring the effectiveness of the bolt removal operation.

[0068] The spacing d between any two adjacent braided holes 213 in the circumferential direction of the frame connecting rod 211 is the same, ensuring a uniform distribution of the braided holes 213 on the frame connecting rod 211. Reinforcing convex plates are provided near the braided holes 213. These plates prevent the opening of the braided holes 213 from reducing the strength of the frame connecting rod 211, thus ensuring uniform strength throughout the frame connecting rod 211. This arrangement makes the expansion movement of the frame connecting rod 211 more uniform.

[0069] Preferably, the skeleton braided portion 212, in which the skeleton holes 214 are evenly spaced around the axis of the guide, is divided into a braided frame. A third connecting ring 230 connected to the braided frame by braided wires 220, the braided wires 220 connected to the braided frame, and the braided frame together form a storage net. At least one storage net is provided, and the braided frame of the latter storage net is coaxially fixed to the end of the braided frame of the former storage net that is away from the bolt removal device 100.

[0070] The multiple collection nets make the filter more dense, which helps to improve the capture ability of the remote protection device 200, enhances the capture effect of the remote protection device 200 on emboli 921 of different sizes and shapes, and reduces the risk of emboli 921 re-blocking blood vessels 910.

[0071] like Figure 9 As shown, the processing flow of the remote protection device 200 includes the following steps: fitting the device frame 210 onto the outer surface of the braided mandrel 800, so that the device frame 210 and the braided mandrel 800 are relatively fixed; passing the braided yarn 220 through the braiding hole 213, and connecting the two ends of the braided yarn 220 to the braiding machine; after the braiding is completed, heat-setting the filter screen and the device frame 210 together; after the setting is completed, fixing the two ends of the braided yarn 220 with the third connecting ring 230.

[0072] like Figures 5-7 and Figure 12 As shown, in this embodiment, the third connecting ring 230 includes a second inner ring 231 and a second outer ring 232 coaxially sleeved on the second inner ring 231, and the second inner ring 231 and the second outer ring 232 form a receiving cavity; both ends of the braided yarn 220 are threaded into the receiving cavity. Specifically, the second inner ring 231 and the second outer ring 232 are fixedly connected.

[0073] The second inner ring 231 provides space for the guide to pass through. By using the separate design of the second inner ring 231 and the second outer ring 232 to form a receiving cavity, the processing cost of the third connecting ring 230 is significantly reduced. The above design ensures a stable connection between the braided wire 220 and the third connecting ring 230, reducing the risk of the filter screen shifting or falling off during the removal of the plug.

[0074] Specifically, the braided wire 220 and the third connecting ring 230 are fixedly connected by welding or adhesive bonding. The second inner ring 231 can be cut from medical polymer or metal tubing, and the second outer ring 232 can be made of platinum-iridium, platinum-tungsten, or platinum, which improves the radioactivity of the distal end of the embolus 920.

[0075] By improving the developability, both the thrombectomy device 100 and the remote protection device 200 can be developed as a whole, which helps to ensure the accurate completion of the delivery, deployment and retraction actions of the thrombectomy system.

[0076] Continue to refer to Figure 1 , Figure 14 and Figure 15 In this embodiment, the thrombectomy system further includes a push rod 400, a guide tube 500, and a suction catheter 600, which are sequentially arranged from the inside out. The thrombectomy device 100 and the distal protection device 200 can both be retracted within the guide tube 500. The end of the guide member furthest from the distal protection device 200 is fixed to the push rod 400. The suction catheter 600 is used to aspirate the embolus 920 during surgery and to retrieve the distal protection device 200 and the thrombectomy device 100. The above structure is simple, reliable, and stable in operation. Through the cooperative work between the components, the thrombectomy operation using this system can be completed smoothly and efficiently.

[0077] In this embodiment, the guide includes an inner tube 120 and a guide wire 300. An open end 130 is fixedly connected to one end of the inner tube 120 near the remote protection device 200. The guide wire 300 passes through the inner tube 120 and the open end 130. A first connecting ring 140 is sleeved on the inner tube 120, and the guide wire 300 passes through a third connecting ring 230 and is connected to the remote protection device 200. The use of a low-rigidity guide wire 300 reduces the difficulty of positioning the guide and the remote protection device 200, ensuring that the guide and the remote protection device 200 can complete the alignment operation smoothly and quickly.

[0078] Specifically, the limiting protrusion on the inner tube 120 is an inner tube protrusion ring 121, which is sleeved on the outer side wall of the inner tube 120.

[0079] This embodiment also provides a thrombectomy method applied to the above-mentioned thrombectomy system, comprising the following steps:

[0080] Step 1: Puncture the target location and create a puncture hole. Insert the thrombectomy system into the embolus site of blood vessel 910 through the puncture hole, and place the distal protection device 200 through the embolus 920 at the distal end of the embolus site.

[0081] Step 2: Retract the guiding tube 500 and release the distal protection device 200, allowing the distal protection device 200 to gradually unfold until it adheres to the inner wall of the blood vessel 910.

[0082] Step 3: Guide the thrombectomy device 100 through the thrombus 920 using the guide wire 300 and the guide tube 500, retract the guide tube 500, release the thrombectomy device 100, and allow the thrombectomy device 100 to gradually unfold until the thrombectomy bracket 110 completely covers the thrombus 920.

[0083] Step 4: Remove the guiding catheter 500 from the blood vessel 910.

[0084] Step 5: After the thrombectomy stent 110 and the thrombectomy 920 are fully engaged, withdraw the thrombectomy device 100 and the thrombectomy 920 located in the thrombectomy device 100 into the aspiration catheter 600.

[0085] Step 6: Retract the distal protection device 200 and the embolic fragments 921 located in the distal protection device 200 back into the embolic suction catheter 600, and withdraw the embolic suction catheter 600 from the blood vessel 910.

[0086] This thrombectomy method involves first locating and deploying the distal protection device 200, then using the guide wire 300 to locate the thrombectomy device 100, and finally deploying the thrombectomy device 100, thus successfully completing the deployment of the thrombectomy system. The above process is simple and accurate, utilizing a split design to ensure flexibility in positioning the thrombectomy device 100 and the distal protection device 200, while effectively reducing the positioning time for both devices, thereby ensuring a smooth and efficient thrombectomy operation. This method has a wide range of applications, is easy to operate, and requires minimal workload. It effectively simplifies the thrombectomy process, reduces the risk of errors, improves the thrombectomy effect, reduces the risk of thrombus fragments (921) remaining, and ensures patient safety.

[0087] After the thrombectomy stent 110 is deployed in the blood vessel 910, it gradually expands as the temperature rises and combines with the embolus 920. If the embolus 920 cannot be completely removed in one thrombectomy operation, the thrombectomy device 100 can be re-deployed and retrieved until the embolus 920 is completely removed.

[0088] like Figure 16 As shown, in another embodiment of this example, the guide includes an inner rod 150 and a guide wire 300. One end of the inner rod 150 near the distal protection device 200 is fixedly connected to an inner rod end 160. The guide wire 300 passes through the inner rod 150 and the inner rod end 160. The first connecting ring 140 and the third connecting ring 230 are both sleeved on the inner rod 150.

[0089] Specifically, the limiting protrusion on the inner rod 150 is an inner rod protrusion ring, which is sleeved on the outer side wall of the inner rod 150.

[0090] This embodiment also provides another thrombectomy method applied to the above-mentioned thrombectomy system, including the following steps: Step 1: Puncture is performed at the target location to form a puncture hole, and the thrombectomy system is inserted into the embolus site of the blood vessel 910 through the puncture hole, so that the guide wire 300 and the inner rod 150 pass through the embolus 920 one after the other, and the distal protection device 200 is placed at the distal end of the embolus site.

[0091] Step 2: Retract the guiding catheter 500, release the distal protection device 200 and the thrombectomy device 100, gradually unfold the distal protection device 200 until it fits against the inner wall of the blood vessel 910, and gradually unfold the thrombectomy device 100 until the thrombectomy stent 110 completely covers the embolus 920.

[0092] Step 3: Remove the guiding catheter 500 from the blood vessel 910.

[0093] Step 4: After the thrombectomy bracket 110 and the thrombus 920 are fully engaged, the push rod 400 is retracted toward the suction catheter 600, so that the thrombectomy device 100 and the distal protection device 200 are successively contained within the suction catheter 600, and the thrombus 920 located in the thrombectomy device 100 and the thrombus fragments 921 located in the distal protection device 200 are contained within the suction catheter 600.

[0094] Step 5: Remove the embolization catheter 600 from the blood vessel 910.

[0095] This thrombectomy method involves first positioning the inner rod 150 using the guide wire 300, then positioning the distal protection device 200 and the thrombectomy device 100, and finally unfolding the distal protection device 200 and the thrombectomy device 100 to complete the unfolding action of the thrombectomy system. The above process can also successfully complete the unfolding action of the thrombectomy system. This thrombectomy method also ensures that the thrombectomy operation can be completed smoothly and efficiently.

[0096] This thrombectomy method successfully completes the deployment of the thrombectomy system by first locating and deploying the distal protection device, then using a guidewire to locate the thrombectomy device, and finally deploying the thrombectomy device. The planning of this process is simple and accurate. The split design ensures flexibility in positioning the thrombectomy device and the distal protection device, while effectively reducing the positioning time, thus ensuring a smooth and efficient thrombectomy operation. This method has a wide range of applications, is easy to operate, and requires minimal workload. It effectively simplifies the thrombectomy procedure, reduces the risk of errors, improves the thrombectomy effect, reduces the risk of embolic debris residue, and ensures patient safety.

[0097] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0098] This document uses specific examples to illustrate the principles and implementation methods of the present invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of the present invention. Furthermore, those skilled in the art will recognize that, based on the ideas of the present invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A thrombectomy system capable of being placed within a blood vessel (910), characterized in that, include: The thrombectomy device (100) includes a guide and a thrombectomy module, and a push rod (400), a guide tube (500) and a suction catheter (600) arranged sequentially from the inside to the outside. The guide extends along the length of the blood vessel (910). The thrombectomy module includes a thrombectomy stent (110) and a first connecting ring (140). The thrombectomy stent (110) is sleeved on the guide. The thrombectomy stent (110) includes a stent trap (112) connected end to end and a stent convergence end (113). The stent convergence end (113) is fixed to the first connecting ring (140). The first connecting ring (140) is sleeved on the guide. The remote protection device (200) includes a device frame (210) connected end to end, braided wire (220) and a third connecting ring (230). The device frame (210) is sleeved on the guide member. One end of the device frame (210) is wound with the braided wire (220). The braided wire (220) is gathered in the third connecting ring (230). The third connecting ring (230) is sleeved on the guide member. The opening of the remote protection device (200) is directly opposite the opening of the thrombec bracket (110). Both the thrombectomy device (100) and the distal protection device (200) can be retracted within the guide tube (500). The end of the guide member away from the distal protection device (200) is fixed to the push rod (400). The thrombectomy catheter (600) is used to retrieve the embolus (920), the distal protection device (200), and the thrombectomy device (100). The guide member includes an inner tube (120) and a guide wire (300), the guide wire (300) passing through... The first connecting ring (140) is sleeved on the inner tube (120), and the guide wire (300) passes through the third connecting ring (230) and is connected to the remote protection device (200); the guide member includes an inner rod (150) and a guide wire (300), the guide wire (300) passes through the inner rod (150), and both the first connecting ring (140) and the third connecting ring (230) are sleeved on the inner rod (150); The support net (112) forms a parallelogram grid, which is spirally distributed around the axis of the guide. The support net (112) can drive the first connecting ring (140) to rotate around the axis of the guide. When the bolt pick (110) is displaced relative to the guide, the first connecting ring (140) stops at the first connecting ring (140) abutting against the limiting protrusion, which is a spherical part. The device frame (210) includes a frame connecting rod (211) and a frame braiding portion (212) located on one side of the frame connecting rod (211). The frame braiding portion (212) forms frame holes (214), which are evenly spaced around the axis of the guide member. The frame braiding portion (212) has through braiding holes (213), which are evenly spaced around the frame holes (214). Each braiding filament (220) passes through one braiding hole (213) and is fixed at both ends to the third connecting ring (230). A frame connector (215) is provided on the other side of the frame connecting rod (211). The connector (215) is fixed to the fourth connecting ring (240), which is sleeved on the guide member; the skeleton woven part (212) with the skeleton hole (214) evenly distributed around the axis of the guide member is divided into a woven frame. The third connecting ring (230) connected to the woven frame by the woven thread (220), the woven thread (220) connected to the woven frame, and the woven frame form a storage net; the storage net is provided at least one, and the woven frame of the latter storage net is coaxially fixed to the end of the woven frame of the former storage net away from the bolt removal device (100); The third connecting ring (230) includes a second inner ring (231) and a second outer ring (232) coaxially sleeved on the second inner ring (231). The second inner ring (231) and the second outer ring (232) form a receiving cavity; both ends of the braided yarn (220) are threaded into the receiving cavity.

2. The thrombectomy system according to claim 1, characterized in that, A first connecting ring (140) and a connected thrombectomy bracket (110) constitute a thrombectomy assembly, which is provided with at least one thrombectomy assembly.

3. The thrombectomy system according to claim 1, characterized in that, There are two bolt removal groups. The parallelogram grids on the two bolt removal brackets (110) are spiraled in opposite directions around the axis of the guide, so that the two bolt removal groups rotate in opposite directions. The two bolt removal groups are arranged at intervals along the extension direction of the guide, and the adjacent bolt removal groups can have some overlapping areas.

4. The thrombectomy system according to claim 1, characterized in that, The ratio of the length of the long side to the length of the short side of the parallelogram grid is between 1.5 and 3.

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