Embolism protection structure, shaping tool and preparation method

Abstract

The invention discloses an embolism protection structure, a shaping tool and a preparation method, and relates to the technical field of interventional medical instruments.The embolism protection structure is optimized, a straight third weaving section is arranged between a second weaving section and a tow for connection, the straight third weaving section can provide better supporting force, and the stability of the second weaving section is improved. The embolism protection structure is prevented from displacing in the blood vessel in the use process, and the embolism protection structure can generate a better thrombus fishing effect; and the woven wires are equally divided and shaped to form tows, so that the pushing force for pushing in the operation process and the withdrawing force for withdrawing from the blood vessel after the operation can be reduced. Besides, according to the optimized embolism protection structure, the second frustum-shaped weaving section and the third straight weaving section enable weaving preparation to be more convenient, and the arrangement of the tows and the fishing holes enable the embolism protection structure to be more convenient in the heat setting process. And the preparation difficulty is reduced, and meanwhile, the formed embolism protection structure has a more stable structure.

Description

Technical Field

[0001] The present application relates to the technical field of interventional medical devices, and in particular to an embolic protection structure, a shaping tool, and a preparation method. Background Art

[0002] The fishing part of the distal embolic protection device is generally of two types: cutting and weaving. Among them, the distal embolic protection device made by cutting has high strength, but poor flexibility and poor adaptability to blood vessels; the embolic protection device made by weaving has good flexibility, but the process is complicated and the processing is unstable. Summary of the invention

[0003] The present application aims to solve one of the above technical problems in the prior art. To this end, an embodiment of the present application provides an embolic protection structure.

[0004] The embodiment of the present application also provides a shaping tool.

[0005] The embodiment of the present application also provides a method for preparing an embolic protection structure.

[0006] According to an embodiment of the first aspect of the present application, there is provided an embolic protection structure, comprising a mesh tube body, wherein the mesh tube body is woven from a plurality of braided wires;

[0007] Among them, the net pipe body includes a first braided segment, a second braided segment, a third braided segment and a fourth braided segment, the first braided segment, the third braided segment and the fourth braided segment are all hollow cylindrical, the diameter of the fourth braided segment is smaller than the diameter of the first braided segment, the second braided segment is a frustum, the end of the second braided segment with a larger diameter is connected to the third braided segment, and the end of the braided segment with a smaller diameter is connected to the first braided segment, and the several braided wires between the third braided segment and the fourth braided segment are divided into at least three parts, and each part of the braided wire is shaped into a wire bundle so that a number of fishing holes connected to the inside of the third braided segment are formed between the third braided segment and the fourth braided segment.

[0008] The above-mentioned embolic protection structure has at least the following beneficial effects: the present application optimizes the embolic protection structure by providing a straight third woven segment between the second woven segment and the wire bundle for connection. The straight third woven segment can provide better support force to prevent the embolic protection structure from being displaced in the blood vessel during use. The embolic protection structure of the present application can produce a better thrombus capture effect; the wire bundle formed by the woven wires being evenly divided and shaped can reduce the pushing force during the operation and the retraction force from the blood vessel after the operation. In addition, the optimized embolic protection structure, the cone-shaped second woven segment and the straight third woven segment make the weaving preparation more convenient. The provision of the wire bundle and the capture hole also makes the heat setting process of the embolic protection structure of the present application more convenient, which reduces the difficulty of preparation and also makes the formed embolic protection structure have a more stable structure.

[0009] According to an embodiment of the second aspect of the present application, there is provided a shaping tool, comprising a first shaping member, wherein the first shaping member comprises a first shaping portion, a second shaping portion and a third shaping portion, wherein the first shaping portion is used to assist in weaving an unshaped first braided segment, the second shaping portion is used to assist in weaving an unshaped second braided segment, the third shaping portion is used to assist in weaving an unshaped third braided segment, and a plurality of fourth shaping portions are detachably connected to the third shaping portion, wherein the fourth shaping portion is used to evenly divide a plurality of braided wires in a weaving process of the unshaped third braided segment to form at least three braided strands;

[0010] The second shaping member comprises a first core and a second core, the first core and the second core are detachably connected, and a shaping structure is provided at the joint between the first core and the second core, the first core is used to assist in shaping the first braided segment and the second braided segment, separated by braided strands, and the unshaped third braided segment is divided into two parts, one part is shaped with the assistance of the first core, and the other part is shaped with the assistance of the second core to form a fourth braided segment, and the shaping structure is used to assist in shaping the braided strands into a yarn bundle.

[0011] The above-mentioned embolic shaping tool has at least the following beneficial effects: by setting the first shaping part, the second shaping part and the third shaping part which are compatible with the first weaving segment, the second weaving segment and the third weaving segment, the weaving process is more convenient. At the same time, the setting of the fourth shaping part facilitates the formation of the weaving strands, and the fourth shaping part is configured to be removable, so that the first shaping part can be more easily pulled out after the weaving is completed; the first core part is configured to adapt to the shaping of the first weaving segment, the second weaving segment and the third weaving segment, and the second core part is configured to be separable from the first core part, which is convenient for separation from the embolic protection structure after shaping. The use of the shaping tool for weaving and shaping the embolic protection structure can greatly improve the weaving efficiency and shaping efficiency, and the formed embolic protection structure also has a stable shape.

[0012] According to the bolt shaping tool described in the embodiment of the second aspect of the present application, the first core portion includes a first shaping segment, a second shaping segment and a third shaping segment, the first shaping segment is a cylinder adapted to the inner diameter of the first braiding segment, the second shaping segment is a first cone adapted to the inner wall of the second braiding segment, and the third shaping segment is a cylinder adapted to the inner diameter of the third braiding segment, wherein a second cone is provided at the end of the third shaping segment, and the second cone is provided with a plurality of shaping grooves adapted to the wire bundle, and the shaping grooves form the shaping structure.

[0013] According to the bolt shaping tool described in the embodiment of the second aspect of the present application, the second shaping member also includes a third core portion, the third core portion is detachably connected to the third shaping section, the number of the third core portions is consistent with the number of the shaping grooves, and the third core portion is used for separating and shaping the end braiding wires of the wire bundle.

[0014] According to the bolt shaping tool described in the embodiment of the second aspect of the present application, the third shaping section is provided with a third mounting hole for the third core to be inserted, and the third core is interference fit with the third mounting hole, or the third core is bonded to the third mounting hole by glue.

[0015] According to the bolt shaping tool described in the embodiment of the second aspect of the present application, the third shaping portion is provided with a first mounting hole for plugging and connecting the fourth shaping portion, and the fourth shaping portion and the mounting hole are interference fit, or the fourth shaping portion and the mounting hole are bonded by glue.

[0016] According to the bolt shaping tooling described in the embodiment of the second aspect of the present application, the second core portion is a cylinder adapted to the inner diameter of the fourth braided segment, and the end of the first core portion is provided with a second mounting hole for plugging and connecting the second core portion, and the second core portion and the second mounting hole are interference fit, or the second core portion and the second mounting hole are bonded to each other by glue.

[0017] According to an embodiment of the third aspect of the present application, a method for preparing an embolic protection structure is provided, comprising the following steps:

[0018] After fixing a plurality of braided wires to the third shaping portion, the braided wires are braided in a direction toward the first shaping portion to form a portion of an unshaped third braided segment, and the braiding is stopped when the braiding is close to the fourth shaping portion, so that the braided wires are evenly divided into at least three braided strands, and then the braided wires continue to be braided in the direction of the first shaping portion to sequentially form another portion of an unshaped third braided segment, an unshaped second braided segment, and an unshaped first braided segment;

[0019] Separating the fourth shaping part from the third shaping part, and pulling the remaining part of the first shaping part out of the unshaped third braided segment;

[0020] Put the first core into the unshaped third shaping part, after the second shaping part is in place, make the braided strands close to the shaping structure, adjust the unshaped third braided segment aligned with the second core, and make the unshaped third braided segment shrink to fit the second core;

[0021] After heating and shaping, the second core is separated from the first core, and the first core is pulled out of the fishing hole.

[0022] According to the method for preparing an embolic protection structure described in an embodiment of the third aspect of the present application, the braiding wire is in close contact with the surface of the first molding member during the weaving process, and is in close contact with the surface of the second molding member during the heat setting process, wherein, during the weaving process of the braiding wire along the direction toward the first molding portion, the weaving is stopped when the weaving position of the braiding wire is 2 to 3 mm away from the fourth molding portion.

[0023] According to the method for preparing an embolic protection structure described in an embodiment of the third aspect of the present application, during the weaving process, the braided strands are tightly bound by the first filament bundle to make the braided strands fit the first shaping piece; a second filament is arranged at the connection position between the third braided segment close to a part of the unshaped second braided segment and the braided strands.

[0024] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The present application is further described below with reference to the accompanying drawings and embodiments;

[0026] Figure 1 is a schematic structural diagram of an embolic protection structure of an embodiment of the present application;

[0027] Figure 2 This is a schematic diagram of the structure of the first shaping member in the embodiment of the present application. Figure 1 ;

[0028] Figure 3 This is a schematic diagram of the structure of the first shaping member in the embodiment of the present application. Figure 2 ;

[0029] Figure 4 is a structural schematic diagram of the fourth shaping portion in an embodiment of the present application;

[0030] Figure 5 Schematic diagram of preparing an unshaped embolic protection structure by using a first shaped member in an embodiment of the present application

[0031] Figure 6is a schematic structural diagram of an unformed embolic protection structure in an embodiment of the present application;

[0032] Figure 7 is a schematic diagram of preparing an embolic protection structure with a second shaping member in an embodiment of the present application;

[0033] Figure 8 It is a schematic structural diagram of the first core portion in an embodiment of the present application.

[0034] Figure markings: first shaping part 1, first shaping portion 11, first mounting hole 12, second shaping portion 13, third shaping portion 14, fourth shaping portion 2, first core portion 3, first shaping segment 31, second shaping segment 32, third shaping segment 33, third mounting hole 34, second cone 35, shaping groove 351, second mounting hole 352, embolic protection structure 5, filament bundle 51, second braiding segment 52, first braiding segment 53, third braiding segment 54, fourth braiding segment 55, third core portion 61, second core portion 62, second filament 71, first filament 72, third filament 73. DETAILED DESCRIPTION

[0035] This section will describe in detail the specific embodiments of the present application. The preferred embodiments of the present application are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present application, but it cannot be understood as a limitation on the scope of protection of the present application.

[0036] In the description of the present application, it should be understood that descriptions involving orientation, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0037] In the description of this application, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed", etc. are understood to exclude the number itself, and "above", "below", "within", etc. are understood to include the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0038] In the description of this application, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in this application based on the specific content of the technical solution.

[0039] Reference Figure 1The first aspect of the present application provides an embolic protection structure 5, including a mesh tube body, which is woven from a plurality of braided wires, wherein the braided wires are made of one of nickel-titanium, stainless steel, and a degradable polymer.

[0040] Specifically, the net pipe body includes a first braided segment 53, a second braided segment 52, a third braided segment 54 and a fourth braided segment 55. The first braided segment 53, the third braided segment 54 and the fourth braided segment 55 are all hollow cylindrical, which is convenient for braiding; the diameter of the fourth braided segment 55 is smaller than the diameter of the first braided segment 53, the second braided segment 52 is a cone shape, the end of the second braided segment 52 with a larger diameter is connected to the third braided segment 54, and the end of the braided segment with a smaller diameter is connected to the first braided segment 53, and the several braided wires between the third braided segment 54 and the fourth braided segment 55 are divided into at least three parts, and each part of the braided wire is shaped into a wire bundle 51, so that a number of fishing holes connected to the inside of the third braided segment 54 are formed between the third braided segment 54 and the fourth braided segment 55.

[0041] By providing a straight third braided segment 54 between the second braided segment 52 and the filament bundle 51 for connection, the straight third braided segment 54 can provide better support force to prevent the embolic protection structure 5 from being displaced in the blood vessel during use.

[0042] During the weaving process, the mesh of the second weaving section 52 in a frustum shape can be woven smaller, which has a better effect of capturing broken thrombi during the operation.

[0043] Among them, the wire bundle 51 formed by the braided wires being evenly divided and shaped can reduce the pushing force during the operation and the withdrawing force from the blood vessel after the operation, which facilitates the smooth progress of the operation and reduces the difficulty of the surgical operation.

[0044] In addition, the optimized embolic protection structure 5, the cone-shaped second braiding segment 52 and the straight third braiding segment 54 make the braiding preparation more convenient, and the setting of the wire bundle 51 and the fishing hole also makes the heat setting process of the embolic protection structure 5 of the present application more convenient, which reduces the difficulty of preparation and also makes the formed embolic protection structure 5 have a more stable structure.

[0045] The processing process is divided into two steps: weaving and heat setting, which can adjust the shape of the embolic protection structure 5 to make the position of the wire bundle and the distribution of the weaving wire more uniform and neat, thereby reducing the pushing force during the operation and the retracting force from the blood vessel after the operation.

[0046] In a specific embodiment of the present application, a plurality of bundles of wires 51 are arranged in a circular array with the central axis of the embolic protection structure 5 as the center, such as Figure 1 As shown, a total of four bundles 51 are provided.

[0047] In addition, during the preparation process of the embolic protection structure 5 of the present application, weaving and heat setting are carried out separately, so that the shape of the embolic protection structure 5 can be adjusted, and the distribution of the filament bundle 51 can be more uniform and neat. The uniform and neat embolic protection structure 5 can reduce the pushing force during the operation and the withdrawal force from the blood vessel after the operation, thereby facilitating the smooth progress of the operation.

[0048] like Figure 2 As shown, the second embodiment of the present application provides a shaping tool, including a first shaping piece 1 and a second shaping piece.

[0049] Among them, Figure 3 As shown, the first shaping member 1 includes a first shaping portion 11, a second shaping portion 13 and a third shaping portion 14, the first shaping portion 11 is used to assist in weaving an unshaped first weaving segment 53, the second shaping portion 13 is used to assist in weaving an unshaped second weaving segment 52, the third shaping portion 14 is used to assist in weaving an unshaped third weaving segment 54, and a plurality of fourth shaping portions 2 are detachably connected to the third shaping portion 14, and the fourth shaping portion 2 is used to evenly divide a plurality of weaving wires in the weaving process of the unshaped third weaving segment 54 to form at least three weaving strands.

[0050] Specifically, the first shaping portion 11 and the third shaping portion 14 are both cylindrical, and the second shaping portion 13 is frustum-shaped.

[0051] The number of fourth shaping portions 2 is consistent with the number of wire bundles 51. Because a plurality of wire bundles 51 are arranged in a circular array, a plurality of fourth shaping portions 2 are also arranged in a circular array.

[0052] like Figure 7 As shown, the second shaping member includes a first core portion 3 and a second core portion 62, the first core portion 3 and the second core portion 62 are detachably connected, and a shaping structure is provided at the joint between the first core portion 3 and the second core portion 62, the first core portion 3 is used to assist in shaping the first braided segment 53 and the second braided segment 52, separated by braided strands, and the unshaped third braided segment 54 is divided into two parts, one part is shaped with the assistance of the first core portion 3, and the other part is shaped with the assistance of the second core 62 to form a fourth braided segment 55, and the shaping structure is used to assist in shaping the braided strands into a yarn bundle 51.

[0053] Specifically, the outer surface shape of the first shaping portion 11 is adapted to the inner surface shape of the first weaving segment 53, the outer surface shape of the second shaping portion 13 is adapted to the inner surface shape of the second weaving segment 52, and the shape of the third shaping portion 14 is adapted to the inner surface shape of the third weaving segment 54, making the weaving process more convenient.

[0054] At the same time, the setting of the fourth shaping part 2 makes it convenient to divide the braided wire into several braided strands. Since the fourth shaping part 2 is configured to be detachable, the first shaping part 1 can be more easily removed after the braiding is completed; the first core part 3 is configured to adapt to the shaping of the first braiding segment 53, the second braiding segment 52 and the third braiding segment 54, and the second core part 62 is configured to be separable from the first core part 3, which is convenient for separation from the embolic protection structure 5 after shaping, and the use of the shaping tooling for weaving and shaping the embolic protection structure 5 can greatly improve the braiding efficiency and shaping efficiency, and the formed embolic protection structure 5 also has a stable shape.

[0055] The weaving process is as follows: after fixing a number of weaving wires on the third shaping portion 14, the weaving wires are weaved in the direction toward the first shaping portion 11 to form a portion of unshaped third weaving segment 54, and the weaving is stopped when it approaches the fourth shaping portion 2. With the assistance of the fourth shaping portion 2, the weaving wires are evenly divided into at least three weaving strands, and the weaving wires in the fourth shaping portion 2 are not weaved.

[0056] After the weaving is completed, the braiding wire continues to be woven toward the first shaping portion 11 to sequentially form another part of the unshaped third braiding segment 54, the unshaped second braiding segment 52 and the unshaped first braiding segment 53. During the weaving process of the third braiding segment 54, the braiding wire is close to the third shaping portion 14; during the weaving process of the second braiding segment 52, the braiding wire fits the second shaping portion 13, and the weaving density of the second braiding segment 52 is denser, so that the formed mesh is smaller, so as to have a better fishing effect; during the weaving process of the first braiding segment 53, the braiding wire fits the first shaping portion 11.

[0057] in, Figure 5 FIG. 1 is a schematic diagram of preparing an unshaped embolic protection structure 5 by using a first shaped member 1. The structure of the unshaped embolic protection structure 5 is as follows: Figure 6 shown.

[0058] Combination Figure 2 and Figure 3 It is understood that the third shaped portion 14 is provided with a first mounting hole 12 for plugging and connecting the fourth shaped portion 2, and the fourth shaped portion 2 and the mounting hole are interference fit, or the fourth shaped portion 2 and the mounting hole are bonded with glue to facilitate the disassembly and assembly of the fourth shaped portion 2.

[0059] Among them, Figure 4 The shape of the fourth shaping portion 2 is shown. The shape of the fourth shaping portion 2 is a plate. Both sides of the plate close to the braided strands are processed with arc transitions to avoid scratching and damaging the braided wire.

[0060] in, Figure 7 It is a schematic diagram of heat-setting the unshaped embolic protection structure 5 by the second shaping member.

[0061] Combination Figure 7 and Figure 8 It is understood that the first core portion 3 includes a first shaping segment 31, a second shaping segment 32 and a third shaping segment 33. The first shaping segment 31 is a cylinder adapted to the inner diameter of the first braiding segment 53, the second shaping segment 32 is a first cone adapted to the inner wall of the second braiding segment 52, and the third shaping segment 33 is a cylinder adapted to the inner diameter of the third braiding segment 54, which facilitates the shaping of the embolic protection structure 5.

[0062] The end of the third shaping section 33 is provided with a second cone 35, and the second cone 35 is provided with a plurality of shaping grooves 351 adapted to the filament bundle 51, and the shaping grooves 351 are formed into a shaping structure. The shaping of the filament bundle 51 is achieved through the shaping structure.

[0063] Since the filament bundles 51 are evenly distributed in a circular array, the plurality of shaping grooves 351 are also distributed in a circular array.

[0064] In some embodiments, Figure 7 As shown, the second shaping member also includes a third core portion 61, which is detachably connected to the third shaping section 33. The number of third core portions 61 is consistent with the number of shaping grooves 351, and the third core portion 61 is used for separating and shaping the end braided wires of the wire bundle 51.

[0065] When the braided strands are placed into the shaping groove 351, the third core portion 61 passes through the middle of several braided wires at the end of the braided strands (that is, the number of braided wires on both sides of the third core portion 61 is the same), and the third core portion 61 and the shaping groove 351 of the same group are in the same plane.

[0066] Before heat setting, the third core 61 can be used to adjust the shape of the transition portion of the braided strands close to the third braiding segment 54 appropriately, so as to avoid entanglement and knotting of the braided wire when it changes from the braided state to the stranded state.

[0067] In some embodiments, such as Figure 8 As shown, the third shaping section 33 is provided with a third mounting hole 34 for the third core 61 to be inserted into, and the third core 61 and the third mounting hole 34 are interference fit, or the third core 61 and the third mounting hole 34 are bonded by glue, so as to facilitate the disassembly and assembly of the third core 61.

[0068] In some specific embodiments, the second core portion 62 is a cylinder adapted to the inner diameter of the fourth braiding segment 55, and the end of the first core portion 3 is provided with a second mounting hole 352 for plugging and connecting the second core portion 62. The second core portion 62 and the second mounting hole 352 are interference fit, or the second core portion 62 and the second mounting hole 352 are bonded to each other with glue, so as to facilitate the disassembly and assembly of the second core portion 62.

[0069] In some embodiments, the first shaping member 1 and the second shaping member are both made of stainless steel.

[0070] The third aspect of the present application also provides a method for preparing the embolic protection structure 5. Based on the above-mentioned shaping tooling, the specific preparation steps are as follows:

[0071] After fixing a plurality of braided wires to the third shaping portion 14, the braided wires are braided in a direction toward the first shaping portion 11 to form a portion of an unshaped third braided segment 54, and the braiding is stopped when it is close to the fourth shaping portion 2, so that the braided wires are evenly divided into at least three braided strands, and then the braided wires continue to be braided in a direction toward the first shaping portion 11 to sequentially form another portion of an unshaped third braided segment 54, an unshaped second braided segment 52, and an unshaped first braided segment 53;

[0072] Separate the fourth shaping portion 2 from the third shaping portion 14, and remove the remaining portion of the first shaping member 1 from the unshaped third braided segment 54;

[0073] Put the first core 3 into the unshaped third shaping part 14, and after the second shaping part is in place, make the braided strands close to the shaping structure, adjust the unshaped third braided segment 54 aligned with the second core 62, shrink the unshaped third braided segment 54 to fit the second core 62, and set the third filament 73 on the outer surface of the shrunk third braided segment 54 to assist shaping;

[0074] After high-temperature heating and shaping, the second core part 62 is separated from the first core part 3, and the first core part 3 is pulled out of the fishing hole.

[0075] Furthermore, the braiding wire is in close contact with the surface of the first molding part 1 during the weaving process, and in close contact with the surface of the second molding part during the heat setting process, wherein, during the weaving process of the braiding wire in the direction toward the first molding part 11, the weaving is stopped when the weaving position of the braiding wire is 22 to 3 mm away from the fourth molding part.

[0076] Furthermore, during the weaving process, the weaving strands are tied tightly together by the first filaments 72 so that the weaving strands fit the first shaping member 1; a second filament 71 is set at the connection position between the third weaving segment 54 close to a part of the unshaped second weaving segment 52 and the weaving strands. After the weaving and shaping is completed, the first filament 72 and the second filament 71 are removed.

[0077] In general, the optimized embolic protection structure 5, the cone-shaped second braiding segment 52 and the straight third braiding segment 54 make the braiding preparation more convenient. The setting of the wire bundle 51 and the fishing hole also makes the heat setting process of the embolic protection structure 5 of the present application more convenient, which reduces the difficulty of preparation and also makes the formed embolic protection structure 5 have a more stable structure.

[0078] In addition, the processing is divided into two steps, braiding and heat setting, which can adjust the shape of the embolic protection structure 5 to make the braided wires at the split position more evenly distributed, thereby reducing the pushing force during the operation and the retracting force from the blood vessel after the operation.

[0079] The embodiments of the present application are described in detail above in conjunction with the accompanying drawings, but the present application is not limited to the above embodiments, and various changes can be made within the knowledge scope of ordinary technicians in the technical field without departing from the purpose of the present application.

Claims

1. An embolic protection structure, characterized in that: include A network management body, wherein the network management body is woven from a plurality of braided wires; Among them, the net pipe body includes a first braided segment, a second braided segment, a third braided segment and a fourth braided segment, the first braided segment, the third braided segment and the fourth braided segment are all hollow cylindrical, the diameter of the fourth braided segment is smaller than the diameter of the first braided segment, the second braided segment is a frustum, the end of the second braided segment with a larger diameter is connected to the third braided segment, and the end of the braided segment with a smaller diameter is connected to the first braided segment, and the several braided wires between the third braided segment and the fourth braided segment are divided into at least three parts, and each part of the braided wire is shaped into a wire bundle so that a number of fishing holes connected to the inside of the third braided segment are formed between the third braided segment and the fourth braided segment.

2. A shaping tool for preparing the embolic protection structure according to claim 1, characterized in that: include A first shaping member, the first shaping member comprises a first shaping portion, a second shaping portion and a third shaping portion, the first shaping portion is used to assist in weaving an unshaped first weaving segment, the second shaping portion is used to assist in weaving an unshaped second weaving segment, the third shaping portion is used to assist in weaving an unshaped third weaving segment, a plurality of fourth shaping portions are detachably connected to the third shaping portion, the fourth shaping portions are used to evenly divide a plurality of weaving wires in a weaving process of the unshaped third weaving segment to form at least three weaving strands; The second shaping member comprises a first core and a second core, the first core and the second core are detachably connected, and a shaping structure is provided at the joint between the first core and the second core, the first core is used to assist in shaping the first braided segment and the second braided segment, separated by braided strands, and the unshaped third braided segment is divided into two parts, one part is shaped with the assistance of the first core, and the other part is shaped with the assistance of the second core to form a fourth braided segment, and the shaping structure is used to assist in shaping the braided strands into a yarn bundle.

3. The shaping tool according to claim 2, characterized in that: The first core portion includes a first shaping segment, a second shaping segment and a third shaping segment, the first shaping segment is a cylinder adapted to the inner diameter of the first braiding segment, the second shaping segment is a first cone adapted to the inner wall of the second braiding segment, and the third shaping segment is a cylinder adapted to the inner diameter of the third braiding segment, wherein a second cone is arranged at the end of the third shaping segment, and the second cone is arranged to have a plurality of shaping grooves adapted to the yarn bundle, and the shaping grooves form the shaping structure.

4. The shaping tool according to claim 3, characterized in that: The second shaping member also includes a third core, which is detachably connected to the third shaping section. The number of the third cores is consistent with the number of the shaping grooves, and the third core is used for separating and shaping the end braided wires of the wire bundle.

5. The shaping tool according to claim 4, characterized in that: The third shaping section is provided with a third mounting hole for the third core to be inserted into, and the third core is interference fit with the third mounting hole, or the third core is bonded with the third mounting hole by glue.

6. The shaping tool according to claim 2, characterized in that: The third shaped portion is provided with a first mounting hole for plugging and connecting the fourth shaped portion, and the fourth shaped portion is interference fit with the mounting hole, or the fourth shaped portion is bonded to the mounting hole by glue.

7. The shaping tool according to claim 2, characterized in that: The second core part is a cylinder adapted to the inner diameter of the fourth braided segment, and the end of the first core part is provided with a second mounting hole for plugging and connecting the second core part, and the second core part and the second mounting hole are interference fit, or the second core part and the second mounting hole are bonded by glue.

8. A method for preparing an embolic protection structure, based on the shaping tool as claimed in any one of claims 2 to 7, characterized in that: The steps include: After fixing a plurality of braided wires to the third shaping portion, the braided wires are braided in a direction toward the first shaping portion to form a portion of an unshaped third braided segment, and the braiding is stopped when it is close to the fourth shaping portion, so that the braided wires are evenly divided into at least three braided strands, and then the braided wires continue to be braided in the direction of the first shaping portion to sequentially form another portion of an unshaped third braided segment, an unshaped second braided segment, and an unshaped first braided segment; Separating the fourth shaping part from the third shaping part, and pulling the remaining part of the first shaping part out of the unshaped third braided segment; Put the first core into the unshaped third shaping part, after the second shaping part is in place, make the braided strands close to the shaping structure, adjust the unshaped third braided segment aligned with the second core, and make the unshaped third braided segment shrink to fit the second core; After heating and shaping, the second core is separated from the first core, and the first core is pulled out of the fishing hole.

9. The method for preparing the embolic protection structure according to claim 8, characterized in that: The braiding wire is in close contact with the surface of the first shaping member during the weaving process, and in close contact with the surface of the second shaping member during the heat shaping process, wherein, during the weaving process of the braiding wire in the direction toward the first shaping portion, the weaving is stopped when the weaving position of the braiding wire is 2 to 3 mm away from the fourth shaping portion.

10. The method for preparing the embolic protection structure according to claim 9, characterized in that: During the weaving process, the braided strands are bound tightly by the first filament bundle to make the braided strands fit the first shaping member; a second filament is arranged at the connection position between the third braided segment close to a part of the unshaped second braided segment and the braided strands.

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