An embolic protection structure, sizing tool and method of manufacture

Abstract

This application discloses an embolization protection structure, shaping tooling, and preparation method, relating to the field of interventional medical device technology. This application optimizes the embolization protection structure by connecting it with a straight third braided section between the second braided section and the filament bundle. This straight third braided section provides better support, preventing displacement of the embolization protection structure within the blood vessel during use. The embolization protection structure of this application achieves better thrombus retrieval. The evenly distributed and shaped filament bundle reduces the pushing force during surgery and the retraction force after surgery. Furthermore, the optimized embolization protection structure, with its frustum-shaped second braided section and straight third braided section, facilitates braiding and preparation. The filament bundle and retrieval holes facilitate heat setting of the embolization protection structure, reducing preparation difficulty and resulting in a more stable structure.

Description

Technical Field

[0001] This application relates to the field of interventional medical device technology, and in particular to an embolization protection structure, a shaping tool, and a preparation method. Background Technology

[0002] The catching part of distal embolization protection devices is generally made of two types: cutting and weaving. Among them, distal embolization protection devices made by cutting have high strength but poor flexibility and poor adaptability to blood vessels; embolization protection devices made by weaving have good flexibility but the process is complicated and the processing is unstable. Summary of the Invention

[0003] This application aims to solve one of the aforementioned technical problems in the prior art. Therefore, embodiments of this application provide an embolization protection structure.

[0004] This application also provides a shaping tooling in its embodiments.

[0005] This application also provides a method for preparing an embolization protection structure.

[0006] According to an embodiment of the first aspect of this application, an embolization protection structure is provided, including a mesh tube body, the mesh tube body being woven from a plurality of braided filaments;

[0007] The mesh tube body includes a first braided section, a second braided section, a third braided section, and a fourth braided section. The first, third, and fourth braided sections are all hollow cylindrical. The diameter of the fourth braided section is smaller than that of the first braided section. The second braided section is frustoconical. The end of the second braided section with a larger diameter is connected to the third braided section, and the end of the second braided section with a smaller diameter is connected to the first braided section. The braided wires between the third and fourth braided sections are divided into at least three parts, and each part of the braided wires is shaped into a wire bundle to form several fishing holes that connect the interior of the third braided section.

[0008] The aforementioned embolization protection structure has at least the following beneficial effects: This application optimizes the embolization protection structure by connecting it with a straight third braided section between the second braided section and the fiber bundle. This straight third braided section provides better support, preventing displacement of the embolization protection structure within the blood vessel during use. The embolization protection structure of this application achieves better thrombus retrieval. The evenly distributed and shaped fiber bundle reduces the pushing force during surgery and the retraction force after surgery. Furthermore, the optimized embolization protection structure, with its frustum-shaped second braided section and straight third braided section, facilitates braiding and fabrication. The fiber bundle and retrieval holes also make the heat-setting process of the embolization protection structure of this application easier, reducing fabrication difficulty and resulting in a more stable embolization protection structure.

[0009] According to an embodiment of the second aspect of this application, a shaping fixture is provided, including a first shaping component. The first shaping component includes a first shaping part, a second shaping part, and a third shaping part. The first shaping part is used to assist in weaving an unshaped first weaving segment, the second shaping part is used to assist in weaving an unshaped second weaving segment, and the third shaping part is used to assist in weaving an unshaped third weaving segment. A plurality of fourth shaping parts are detachably connected to the third shaping part. The fourth shaping parts are used to evenly distribute a plurality of weaving threads during the weaving process of the unshaped third weaving segment to form at least three weaving strands.

[0010] The second shaping component includes a first core and a second core, which are detachably connected. 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 and second braided sections. The unshaped third braided section is divided into two parts by the braiding strands. One part is shaped by the first core, and the other part is shaped by the second core to form the fourth braided section. The shaping structure is used to assist in shaping the braided strands into filament bundles.

[0011] The aforementioned embolization shaping fixture has at least the following beneficial effects: by setting a first shaping part, a second shaping part, and a third shaping part that are adapted to the first braiding section, the second braiding section, and the third braiding section, the braiding process is made more convenient. At the same time, the setting of the fourth shaping part facilitates the formation of braided strands, and the fourth shaping part is set to be detachable, making it easier to remove the first shaping part after braiding. The first core is set to be adapted to the shaping of the first braiding section, the second braiding section, and the third braiding section, and the second core is set to be separable from the first core, which facilitates separation from the embolization protection structure after shaping. Moreover, using this shaping fixture for the braiding and shaping of the embolization protection structure can significantly improve the braiding efficiency and shaping efficiency, and the formed embolization protection structure also has a stable shape.

[0012] According to the bolt shaping fixture described in the second aspect of this application, the first core includes a first shaping section, a second shaping section, and a third shaping section. The first shaping section is a column adapted to the inner diameter of the first braided section. The second shaping section is a first truncated cone adapted to the inner wall of the second braided section. The third shaping section is a column adapted to the inner diameter of the third braided section. The end of the third shaping section is provided with a second truncated cone. The second truncated cone is provided with a plurality of shaping grooves adapted to the filament bundle. The shaping grooves form the shaping structure.

[0013] According to the second aspect embodiment of the present application, the second shaping component further includes a third core portion, which is detachably connected to the third shaping section. The number of third core portions is consistent with the number of shaping grooves. The third core portion is used for separating and shaping the end braided yarns of the filament bundle.

[0014] According to the bolt shaping tooling described in the second aspect embodiment of this application, the third shaping section is provided with a third mounting hole for the third core to be inserted into, the third core and the third mounting hole are interference fit, or the third core and the third mounting hole are bonded together with adhesive.

[0015] According to the bolt shaping tooling described in the second aspect of this application, the third shaping part is provided with a first mounting hole for the fourth shaping part to be inserted and connected, the fourth shaping part is interference-fitted with the first mounting hole, or the fourth shaping part is bonded to the first mounting hole with adhesive.

[0016] According to the bolt-fixing fixture described in the second aspect of this application, the second core is a column adapted to the inner diameter of the fourth braided section, and the end of the first core is provided with a second mounting hole for the second core to be inserted and connected. The second core and the second mounting hole are interference-fitted, or the second core and the second mounting hole are bonded together with adhesive.

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

[0018] After fixing several braided threads to the third shaping part, the braided threads are braided in the direction toward the first shaping part to form a portion of the unshaped third braided segment. When the braiding stops near the fourth shaping part, the braided threads are divided into at least three braided strands. Then the braided threads continue to be braided in the direction toward the first shaping part to form another portion of the unshaped third braided segment, the unshaped second braided segment, and the unshaped first braided segment in sequence.

[0019] Separate the fourth shaping part from the third shaping part, and remove the remaining part of the first shaping part from the unshaped third knitting section;

[0020] The first core is placed into the unshaped third braided section. After the second shaping component is placed in place, the braided strands are made to fit tightly against the shaping structure. The unshaped third braided section aligned with the second core is adjusted so that this part of the unshaped third braided section shrinks to fit the second core.

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

[0022] According to the method for preparing the embolization protection structure according to the third aspect of the present application, the braided wire is in close contact with the surface of the first shaping part during the braiding process, and the braided wire is in close contact with the surface of the second shaping part during the heat setting process. In this case, the braided wire stops braiding when the braiding position of the braided wire is 2-3 mm away from the fourth shaping part during the braiding process in the direction toward the first shaping part.

[0023] According to the method for preparing the embolization protection structure according to the third aspect of the present application, during the braiding process, the braided strands are bound together by the first filament bundle so that the braided strands fit the first shaping member; a second filament is provided at the connection position between the third braided segment and the braided strands near a portion of the unshaped second braided segment.

[0024] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

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

[0026] Figure 1 This is a schematic diagram of the embolization protection structure according to an embodiment of this application;

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

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

[0029] Figure 4 This is a schematic diagram of the structure of the fourth shaping part in an embodiment of this application;

[0030] Figure 5 This is a schematic diagram illustrating the fabrication of an unshaped embolic protection structure using a first shaping component, as described in this application embodiment.

[0031] Figure 6This is a schematic diagram of the undefined embolization protection structure in the embodiments of this application;

[0032] Figure 7 This is a schematic diagram of the second shaping component used to prepare the embolization protection structure in an embodiment of this application;

[0033] Figure 8 This is a schematic diagram of the structure of the first core in an embodiment of this application.

[0034] Reference numerals: First shaping part 1, First shaping section 11, First mounting hole 12, Second shaping section 13, Third shaping section 14, Fourth shaping section 2, First core 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, Plug protection structure 5, Fiber bundle 51, Second braiding segment 52, First braiding segment 53, Third braiding segment 54, Fourth braiding segment 55, Third core 61, Second core 62, Second filament 71, First filament 72, Third filament 73. Detailed Implementation

[0035] This section will describe in detail the specific embodiments of this application. Preferred embodiments of this application are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of this application, but they should not be construed as limiting the scope of protection of this application.

[0036] In the description of this application, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0037] In the description of this application, "several" means one or more, "more than" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0038] In the description of this application, unless otherwise expressly defined, terms such as "setup," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this application in conjunction with the specific content of the technical solution.

[0039] Reference Figure 1The first aspect of this application provides an embolization protection structure 5, including a mesh tube body, which is woven from a number of braided filaments, wherein the braided filaments are made of one of nickel-titanium, stainless steel, or biodegradable polymer.

[0040] Specifically, the mesh body includes a first braided section 53, a second braided section 52, a third braided section 54, and a fourth braided section 55. The first braided section 53, the third braided section 54, and the fourth braided section 55 are all hollow cylindrical shapes, which facilitates weaving. The diameter of the fourth braided section 55 is smaller than the diameter of the first braided section 53. The second braided section 52 is frustoconical. The end of the second braided section 52 with a larger diameter is connected to the third braided section 54, and the end of the second braided section 52 with a smaller diameter is connected to the first braided section 53. Several braided wires between the third braided section 54 and the fourth braided section 55 are divided into at least three parts, and each part of the braided wires is shaped into a wire bundle 51 so that several fishing holes connecting the interior of the third braided section 54 are formed between the third braided section 54 and the fourth braided section 55.

[0041] By connecting the second braided section 52 and the filament bundle 51 with a straight third braided section 54, the straight third braided section 54 can provide better support and prevent the embolization protection structure 5 from shifting in the blood vessel during use.

[0042] During the weaving process, the mesh of the second weaving segment 52, which is shaped like a frustum, can be woven to be smaller, resulting in a better capture effect on broken thrombi during surgery.

[0043] Among them, the filament bundle 51 formed by the even distribution and shaping of the braided filaments can reduce the pushing force during the operation and the retraction force after the operation, which facilitates the smooth progress of the operation and reduces the difficulty of the operation.

[0044] In addition, the optimized embolism protection structure 5, with its frustum-shaped second braided section 52 and straight third braided section 54, makes the braiding process more convenient. The setting of the filament bundle 51 and the catching hole also makes the heat setting process of the embolism protection structure 5 of this application more convenient, reducing the difficulty of preparation and making the formed embolism protection structure 5 have a more stable structure.

[0045] The processing consists of two steps: weaving and heat setting. This allows for adjustment of the shape of the embolization protection structure 5, resulting in a more uniform and neat distribution of the braided fibers. It also reduces the pushing force during surgery and the retraction force after surgery.

[0046] In a specific embodiment of this application, several bundles of filaments 51 are arranged in a circular array around the central axis of the plugging protection structure 5, such as... Figure 1 As shown, there are a total of 4 bundles of filaments 51.

[0047] In addition, during the fabrication process of the embolization protection structure 5 of this application, the weaving and heat setting are carried out separately so that the shape of the embolization protection structure 5 can be adjusted, making the distribution of the filament bundles 51 more uniform and neat. The uniform and neat embolization protection structure 5 can reduce the pushing force during the operation and the retraction force after the operation, which facilitates the smooth operation.

[0048] like Figure 2 As shown, a second aspect of this application provides a shaping fixture, including a first shaping component 1 and a second shaping component.

[0049] Among them, such as Figure 3 As shown, the first shaping component 1 includes a first shaping part 11, a second shaping part 13, and a third shaping part 14. The first shaping part 11 is used to assist in weaving the unshaped first weaving segment 53, the second shaping part 13 is used to assist in weaving the unshaped second weaving segment 52, and the third shaping part 14 is used to assist in weaving the unshaped third weaving segment 54. Several fourth shaping parts 2 are detachably connected to the third shaping part 14. The fourth shaping parts 2 are used to evenly distribute several weaving threads during the weaving process of the unshaped third weaving segment 54 to form at least three weaving strands.

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

[0051] The number of fourth shaping parts 2 is the same as the number of filament bundles 51. Since several filament bundles 51 are arranged in a circular array, the corresponding number of fourth shaping parts 2 are also arranged in a circular array.

[0052] like Figure 7 As shown, the second shaping component includes a first core 3 and a second core 62. The first core 3 and the second core 62 are detachably connected, and a shaping structure is provided at the joint between the first core 3 and the second core 62. The first core 3 is used to assist in shaping the first braided section 53 and the second braided section 52. The unshaped third braided section 54 is divided into two parts by the braiding strands. One part is assisted in shaping by the first core 3, and the other part is assisted in shaping by the second core 62 to form the fourth braided section 55. The shaping structure is used to assist in shaping the braided strands into a filament bundle 51.

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

[0054] Meanwhile, the fourth shaping part 2 facilitates the even division of the braided yarn into several braided strands. Because the fourth shaping part 2 is designed to be detachable, it makes it easier to remove the first shaping part 1 after the braiding is completed. The first core part 3 is designed to be adapted to the shaping of the first braided section 53, the second braided section 52 and the third braided section 54, and the second core part 62 is designed to be separable from the first core part 3, which facilitates separation from the embolization protection structure 5 after shaping. Using this shaping tool to braid and shape the embolization protection structure 5 can greatly improve the braiding efficiency and shaping efficiency, and the formed embolization protection structure 5 also has a stable shape.

[0055] The weaving process is as follows: after fixing several weaving threads to the third shaping part 14, the weaving threads are woven in the direction toward the first shaping part 11 to form a part of the unshaped third weaving segment 54. When weaving reaches the fourth shaping part 2, it stops. With the assistance of the fourth shaping part 2, the weaving threads are evenly divided into at least three weaving strands. The weaving threads in the fourth shaping part 2 are not woven.

[0056] After the strands are woven, the braided wires continue to be woven toward the first shaping section 11 to sequentially form another unshaped third braided section 54, an unshaped second braided section 52, and an unshaped first braided section 53. During the weaving of the third braided section 54, the braided wires are close to the third shaping section 14; during the weaving of the second braided section 52, the braided wires are close to the second shaping section 13, and the weaving density of the second braided section 52 is denser, resulting in smaller mesh openings for better catching effect; during the weaving of the first braided section 53, the braided wires are close to the first shaping section 11.

[0057] in, Figure 5 This is a schematic diagram of the fabrication of an unshaped embolism protection structure 5 using the first shaping component 1. The structure of the unshaped embolism protection structure 5 is as follows: Figure 6 As shown.

[0058] Combination Figure 2 and Figure 3 To understand this, the third shaping part 14 is provided with a first mounting hole 12 for the fourth shaping part 2 to be inserted and connected. The fourth shaping part 2 is interference-fitted with the first mounting hole 12, or the fourth shaping part 2 is bonded to the first mounting hole 12 with glue, so as to facilitate the assembly and disassembly of the fourth shaping part 2.

[0059] Among them, such as Figure 4 The shape of the fourth shaping part 2 is shown. The shape of the fourth shaping part 2 is plate-shaped. The two sides of the plate shape near the weaving strands are rounded to avoid scratching and damaging the weaving yarn.

[0060] in, Figure 7 This is a schematic diagram of the heat setting of the unshaped embolization protection structure 5 by the second shaping component.

[0061] Combination Figure 7 and Figure 8 To understand this, the first core 3 includes a first shaping section 31, a second shaping section 32, and a third shaping section 33. The first shaping section 31 is a column that adapts to the inner diameter of the first braided section 53, the second shaping section 32 is a first truncated cone that adapts to the inner wall of the second braided section 52, and the third shaping section 33 is a column that adapts to the inner diameter of the third braided section 54, which facilitates the shaping of the embolization protection structure 5.

[0062] The third shaping section 33 has a second cone 35 at its end, and the second cone 35 has several shaping grooves 351 adapted to the filament bundle 51, forming a shaping structure. The shaping structure is used to achieve the forming of the filament bundle 51.

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

[0064] In some embodiments, such as Figure 7 As shown, the second shaping component also includes a third core 61, which is detachably connected to the third shaping section 33. The number of third cores 61 is the same as the number of shaping grooves 351. The third core 61 is used for separating and shaping the end braided yarns of the filament bundle 51.

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

[0066] Before heat setting, the transition part of the braided strands near the third braiding section 54 can be appropriately shaped by the third core 61 to prevent the braided yarns from tangling and knotting when they change from a braided state to a 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. 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 glued together, which facilitates the assembly and disassembly of the third core 61.

[0068] In some specific embodiments, the second core 62 is a column that adapts to the inner diameter of the fourth braided section 55. The end of the first core 3 is provided with a second mounting hole 352 for the second core 62 to be inserted and connected. The second core 62 is interference-fitted with the second mounting hole 352, or the second core 62 is bonded to the second mounting hole 352 with glue, which facilitates the assembly and disassembly of the second core 62.

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

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

[0071] After fixing several braided threads to the third shaping part 14, the braided threads are braided in the direction toward the first shaping part 11 to form a portion of the unshaped third braided segment 54. When the braiding stops near the fourth shaping part 2, the braided threads are divided into at least three braided strands. Then the braided threads continue to be braided in the direction toward the first shaping part 11 to form another portion of the unshaped third braided segment 54, the unshaped second braided segment 52, and the unshaped first braided segment 53 in sequence.

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

[0073] The first core 3 is inserted into the unshaped third braided section 54. After the second shaping component is placed in place, the braided strands are made to fit tightly against the shaping structure. The unshaped third braided section 54 aligned with the second core 62 is adjusted so that the unshaped third braided section 54 shrinks to fit the second core 62. A third filament 73 is provided on the outer surface of the shrunken third braided section 54 to assist in shaping.

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

[0075] Furthermore, during the weaving process, the braided wire adheres closely to the surface of the first shaping part 1, and during the heat setting process, the braided wire adheres closely to the surface of the second shaping part. During the weaving process of the braided wire in the direction toward the first shaping part 11, the weaving stops when the weaving position of the braided wire is 22~3mm away from the fourth shaping part.

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

[0077] Overall, the optimized embolism protection structure 5, with its frustum-shaped second braided section 52 and straight third braided section 54, makes braiding and preparation more convenient. The setting of the filament bundle 51 and the catching hole also makes the heat setting process of the embolism protection structure 5 of this application more convenient, reducing the difficulty of preparation and making the formed embolism protection structure 5 have a more stable structure.

[0078] In addition, the processing is divided into two steps: weaving and heat setting. This allows for adjustment of the shape of the embolization protection structure 5, resulting in a more uniform and neat distribution of the braided filaments at the strand positions. This reduces the pushing force during surgery and the retraction force after surgery.

[0079] The embodiments of this application have been described in detail above with reference to the accompanying drawings. However, this application is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of this application.

Claims

1. An embolization protection structure, characterized in that: include The network tube body is woven from several braided wires; The mesh tube body includes a first braided section, a second braided section, a third braided section, and a fourth braided section. The first, third, and fourth braided sections are all hollow cylindrical. The diameter of the fourth braided section is smaller than that of the first braided section. The second braided section is frustoconical. The end of the second braided section with a larger diameter is connected to the third braided section, and the end of the second braided section with a smaller diameter is connected to the first braided section. The braided wires between the third and fourth braided sections are divided into at least three parts, and each part of the braided wires is shaped into a wire bundle to form several fishing holes that connect the interior of the third braided section.

2. A shaping tool for preparing the embolization protection structure according to claim 1, characterized in that: include The first shaping component includes a first shaping part, a second shaping part, and a third shaping part. The first shaping part is used to assist in weaving an unshaped first weaving segment, the second shaping part is used to assist in weaving an unshaped second weaving segment, and the third shaping part is used to assist in weaving an unshaped third weaving segment. Several fourth shaping parts are detachably connected to the third shaping part. The fourth shaping parts are used to evenly distribute several weaving threads during the weaving process of the unshaped third weaving segment to form at least three weaving strands. The second shaping component includes a first core and a second core, which are detachably connected. 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 and second braided sections. The unshaped third braided section is divided into two parts by the braiding strands. One part is assisted in shaping by the first core, and the other part is assisted in shaping by the second core to form the fourth braided section. The shaping structure is used to assist in shaping the braided strands into filament bundles. The first core includes a first shaping section, a second shaping section, and a third shaping section. The first shaping section is a column that adapts to the inner diameter of the first braiding section. The second shaping section is a first truncated cone that adapts to the inner wall of the second braiding section. The third shaping section is a column that adapts to the inner diameter of the third braiding section. The end of the third shaping section is provided with a second truncated cone. The second truncated cone is provided with a plurality of shaping grooves that adapt to the yarn bundle. The shaping grooves form the shaping structure.

3. The fixture according to claim 2, characterized in that: The second shaping component also includes a third core, which is detachably connected to the third shaping section. The number of third cores is the same as the number of shaping grooves. The third core is used for separating and shaping the end braided yarns of the filament bundle.

4. The fixture according to claim 3, characterized in that: The third shaping section is provided with a third mounting hole for the third core to be inserted into. The third core is interference-fitted with the third mounting hole, or the third core is bonded to the third mounting hole with adhesive.

5. The fixture according to claim 2, characterized in that: The third shaping part is provided with a first mounting hole for the fourth shaping part to be inserted and connected. The fourth shaping part is interference-fitted with the first mounting hole, or the fourth shaping part is bonded to the first mounting hole with glue.

6. The fixture according to claim 2, characterized in that: The second core is a column that adapts to the inner diameter of the fourth braided section. The end of the first core is provided with a second mounting hole for the second core to be inserted and connected. The second core is interference-fitted with the second mounting hole, or the second core is bonded to the second mounting hole with glue.

7. A method for preparing an embolization protection structure, based on the shaping tooling described in any one of claims 2 to 6, characterized in that, Includes the following steps: After fixing several braided threads to the third shaping part, the braided threads are braided in the direction toward the first shaping part to form a portion of the unshaped third braided segment. When the braiding stops near the fourth shaping part, the braided threads are divided into at least three braided strands. Then the braided threads continue to be braided in the direction toward the first shaping part to form another portion of the unshaped third braided segment, the unshaped second braided segment, and the unshaped first braided segment in sequence. Separate the fourth shaping part from the third shaping part, and remove the remaining part of the first shaping part from the unshaped third knitting section; The first core is placed into the unshaped third braided section. After the second shaping component is placed in place, the braided strands are made to fit tightly against the shaping structure. The unshaped third braided section aligned with the second core is adjusted so that this part of the unshaped third braided section shrinks to fit the second core. After the heating and shaping are completed, the second core is separated from the first core, and the first core is pulled out of the catching hole.

8. The method for preparing the embolization protection structure according to claim 7, characterized in that: During the weaving process, the braided yarn adheres closely to the surface of the first shaping part, and during the heat setting process, the braided yarn adheres closely to the surface of the second shaping part. During the weaving process of the braided yarn in the direction toward the first shaping part, the weaving stops when the weaving position of the braided yarn is 2-3 mm away from the fourth shaping part.

9. The method for preparing the embolization protection structure according to claim 8, characterized in that: During the weaving process, the braided strands are bound together by the first filament bundle so that the braided strands fit the first shaping component; a second filament is provided at the connection position between the third braided segment and the braided strands near a portion of the unshaped second braided segment.

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