Medical implant, weaving jig and weaving method

Abstract

The invention provides a medical implant, a weaving jig and a weaving method.The medical implant is formed by weaving degradable wires and is provided with an embolism section and two limiting sections, the two ends of the embolism section are connected with the two limiting sections respectively, and the embolism section comprises a first outer diameter section and a second outer diameter section; in the projection of the medical implant in the axis direction, the first outer diameter section has a first outer diameter L1, the second outer diameter section has a second outer diameter L2, and the limiting section has a third outer diameter L3; wherein L1 < L2 < L3. The plugging performance and the stability of the medical implant are both improved.

Description

Technical Field

[0001] The present application relates to the technical field of medical devices, and in particular to a medical implant, a woven fixture and a woven method. Background Art

[0002] Currently, atrial septal defect (ASD), ventricular septal defect (VSD), patent ductus arteriosus (PDA), aortopulmonary septal defect, coronary arteriovenous fistula and other diseases can be treated through surgery and interventional embolization.

[0003] Since surgical treatment is traumatic, with large amounts of bleeding, patients experience significant postoperative pain and slow recovery, interventional embolization has lower risks than surgical treatment. However, the implants currently used in interventional embolization are at risk of shifting from their original implantation positions, thus affecting their embolization function. Moreover, once the implant shifts, additional surgery or medical intervention is required to reposition or remove the implant, greatly increasing the risk and discomfort for the patient. Summary of the invention

[0004] In order to overcome the defect of the implants in the prior art mentioned above that there is a risk of displacement from the original implantation position, the present application provides a medical implant, a weaving jig and a weaving method.

[0005] The specific technical solutions are as follows:

[0006] In a first aspect, the present invention provides a medical implant, which is made of wire and has an embolization segment and two limiting segments, wherein two ends of the embolization segment are respectively connected to the two limiting segments, and the embolization segment includes a first outer diameter segment and a second outer diameter segment;

[0007] In the projection of the medical implant in the axial direction, the first outer diameter section has a first outer diameter L1, the second outer diameter section has a second outer diameter L2, and the limiting section has a third outer diameter L3; wherein L1<L2<L3.

[0008] wherein, in a projection in the axial direction of the medical implant, the second outer diameter segment includes at least one arc edge;

[0009] When the number of the arc side is one, the radian of the arc side is 2π;

[0010] When the number of the arc sides is two, the two arc sides are symmetrically arranged relative to the axis of the medical implant, and the curvature of the arc sides is between between;

[0011] When the number of the arc sides is more than three, the more than three arc sides are arranged in a circular array relative to the axis of the medical implant, and the curvature of the arc sides is between between.

[0012] Wherein, both ends of the first outer diameter section are respectively connected to the two limit sections;

[0013] The middle part of the first outer diameter section is wound N times along the axis of the medical implant to form the second outer diameter section; or, the middle part of the first outer diameter section radially protrudes to form the second outer diameter section; or, the middle part of the first outer diameter section is provided with two or more contact parts, and the two or more contact parts are circumferentially arranged along the middle part of the first outer diameter section to form the second outer diameter section;

[0014] and / or, in, in,

[0015] Wherein, the medical implant is provided with a first bluff body and a second bluff body, the first bluff body is located in the first outer diameter section, and the second bluff body is located in the second outer diameter section;

[0016] When the second outer diameter section is formed by winding the middle portion of the first outer diameter section along the axis of the medical implant, the second outer diameter section includes at least three bending portions, and the second bluff body is disposed between two adjacent bending portions.

[0017] The limiting section has a plurality of petal-like structures, and the limiting section is a single-layer body composed of the plurality of petal-like structures, the plurality of petal-like structures are arranged along the circumference of the medical implant, and the petal-like structures partially overlap with the adjacent petal-like structures to form the single-layer body;

[0018] In the projection along the axis of the medical implant, the area of ​​the petal-shaped structure is between 3 mm 2 ~80mm 2 The ratio of the overlapping area of ​​the petal-like structure to its adjacent petal-like structure is between

[0019] Wherein, the medical implant is provided with a third bluff body, and the third bluff body is located on a side of the limiting section away from the embolization section;

[0020] The ratio of the projection area of ​​the third bluff body in the axial direction of the medical implant to the projection area of ​​the limiting section in the axial direction of the medical implant is between: And / or, the thickness of the limiting section is between 0.25 mm and 0.6 mm, and the thickness of the third bluff body is between 0.1 mm and 0.3 mm; and / or, the third bluff body is made of a degradable material, and the third bluff body is a melt-blown mesh structure.

[0021] Wherein, at least one positioning assembly is arranged on the wire, and the positioning assembly comprises at least two positioning parts, and the free ends of the positioning parts are arranged in a direction away from the wire.

[0022] Wherein, when the number of the positioning components is more than two, the length of the wire between two adjacent positioning components is between 5 mm and 100 mm;

[0023] And / or, the distance between the free end of the positioning portion and the wire is between 0.05 mm and 1 mm;

[0024] And / or, the outer diameter of the positioning portion gradually decreases in a direction away from the wire;

[0025] And / or, the plurality of positioning portions are arranged in a ring array in a projection on the axial direction of the medical implant;

[0026] And / or, the positioning portion is located on a side of the wire away from the axis of the medical implant; or the positioning portion includes a sub-positioning portion one and a sub-positioning portion two, and the sub-positioning portion one and the sub-positioning portion two are relatively arranged on both sides of the wire, and the distance between the free end of the sub-positioning portion one and the wire is between 0.05mm and 1mm, and the distance between the free end of the sub-positioning portion two and the wire is between 0.05mm and 1mm.

[0027] Wherein, the first outer diameter section is provided with a developing member, and the developing member is arranged around the outer circumference of the first outer diameter section;

[0028] Wherein, the developing component is close to the limiting section, and the distance between the developing component and the limiting section is between 0.4 mm and 5 mm.

[0029] In a second aspect, the present invention provides a medical implant weaving jig for weaving any of the medical implants described above, comprising:

[0030] Bracket;

[0031] A first braided part, the first braided part is movably arranged on the bracket, and a first end of the first braided part is provided with a plurality of radial protrusions (A1, A2...A 2n ), and a first gap (a1, a2...a 2n ), the second end of the first braided portion is also provided with a plurality of radial protrusions (B1, B2...B 2n ), and a second gap (b1, b2...b 2n );

[0032] The second braided part is movably arranged on the bracket, the second braided part is close to the first end of the first braided part, and the second braided part is provided with a plurality of axial boss components (C1, C2...C n );

[0033] The third braided part is movably arranged on the bracket, the third braided part is close to the second end of the first braided part, and the third braided part is also provided with a plurality of axial boss components (D1, D2...D n ).

[0034] In a third aspect, the present invention provides a method for weaving a medical implant, using the medical implant weaving jig as described above, the method comprising:

[0035] Assembling the first braided part, the second braided part, and the third braided part based on the size of the medical implant to be braided;

[0036] One end of the wire is fixed to the first braided part, and the other end of the wire is arranged according to a1, C1, a4, b1, D1, b4, a3, C2, a6, b3, D2, b6...a 2(n-1)-1 , C n-1 、a 2n 、b 2(n-1)-1 , D n-1 、b 2n 、a 2n-1 , C n , a2, b 2n-1 , D n , b2, and sequentially pass through a plurality of radial bosses and a plurality of axial boss assemblies to form a mesh braided body; wherein the wire material located between the radial boss at the first end of the first braided part and the radial boss at the second end of the first braided part is wound along the outer circumference of the first braided part; wherein, during the braiding process, the wire material is interwoven and passed through the braided paths;

[0037] The braiding jig is removed, and the mesh braided body is placed into a shaping jig for shaping, thereby obtaining the medical implant.

[0038] This application has at least the following beneficial effects:

[0039] The present application provides a medical implant, which is made of wire and has an embolization section and two limiting sections. The two ends of the embolization section are respectively connected to the two limiting sections. The embolization section includes a first outer diameter section and a second outer diameter section. In the projection of the medical implant in the axial direction, the first outer diameter section has a first outer diameter L1, the second outer diameter section has a second outer diameter L2, and the limiting section has a third outer diameter L3; wherein L1<L2<L3.

[0040] The present application provides a braided jig for medical implants, which is used for the medical implants described above, and comprises: a bracket; a first braided part, which is movably arranged on the bracket, and a first end of the first braided part is provided with a plurality of radial protrusions (A1, A2, A3, A4, A5, A6, A7, A8, A9, A10, A110, A120, A130, A140, A150, A160, A170, A180, A190, A210, A220, A230, A240, A250, A260, A270, A280, A290, A310, A320, A330, A340, A350, A360, A370, A380, A390, A390, A390, A390, A3 2n ), and a first gap (a1, a2...a 2n ), the second end of the first braided portion is also provided with a plurality of radial protrusions (B1, B2...B 2n ), and a second gap (b1, b2...b 2n ); a second braided portion, the second braided portion is movably arranged on the bracket, the second braided portion is close to the first end of the first braided portion, and a plurality of axial boss components (C1, C2...C n ); a third braided portion, the third braided portion is movably arranged on the bracket, the third braided portion is close to the second end of the first braided portion, and the third braided portion is also provided with a plurality of axial boss components (D1, D2...D n ).

[0041] The present application provides a method for weaving a medical implant, using the medical implant weaving jig as described above, the method comprising: assembling a first weaving part, a second weaving part and a third weaving part based on the size of the medical implant to be weaved; fixing one end of a wire to the first weaving part, and making the other end of the wire according to a1, C1, a4, b1, D1, b4, a3, C2, a6, b3, D2, b6...a 2(n-1)-1 , C n-1 、a 2n 、b 2(n-1)-1 , D n-1 、b 2n 、a 2n-1 , C n , a2, b 2n-1 , D n , b2, and passes through a plurality of radial bosses and a plurality of axial boss assemblies in sequence to form a mesh braided body; wherein the wire material between the radial boss at the first end of the first braided part and the radial boss at the second end of the first braided part is wound along the outer circumference of the first braided part; wherein, during the braiding process, the wire material is interwoven and passed through the braided paths up and down; the braiding jig is removed, and the mesh braided body is placed into a shaping jig for shaping, so as to obtain a medical implant.

[0042] The medical implant of the present application increases the local outer diameter of the embolization section by designing the outer diameter of the first outer diameter section and the second outer diameter section, thereby increasing the contact point / contact surface between the embolization section and the part to be blocked, so that when the medical implant blocks the part to be blocked, it is in close contact with the part to be blocked, thereby improving the blocking effect of the medical implant. At the same time, when the medical implant blocks the part to be blocked, the medical implant and the part to be blocked form a structural connection with high strength, thereby improving the stability of the medical implant, helping to prevent the medical implant from shifting when the force or pressure changes (such as when blood flows), thereby ensuring the durability and stability of the blocking effect. Moreover, the medical implant can better adapt to the part to be blocked with a complex or irregular shape, ensuring the integrity of the blocking, and further improving the blocking effect of the medical implant.

[0043] The medical implant of the present application designs the outer diameters of the first outer diameter section and the limiting section so that the limiting section has a larger outer diameter, can provide better support and stronger structural strength, can adapt to the blocking environment under different pressures, and can be permanently clamped to the end of the part to be blocked, ensuring the durability and stability of the blocking effect. At the same time, it can adapt to the parts to be blocked with different end shapes, achieve full coverage of the ends of the parts to be blocked, further improve the blocking effect, and thus reduce complications caused by incomplete blocking.

[0044] The medical implant of the present application designs the outer diameters of the second outer diameter section and the limiting section so that the medical implant can pass through the blocked parts with complex or irregular shapes, and can adapt to the blocked parts with different end shapes, and can be permanently clamped to the ends of the blocked parts, thereby achieving a dual improvement in the blocking performance and stability performance of the medical implant.

[0045] The medical implant of the present application makes the overall structure of the medical implant coordinated and unified by designing the outer diameters of the first outer diameter section, the second outer diameter section and the limiting section, which is convenient for delivery by the delivery system; at the same time, it helps to enhance the stability of the structure, so that it can better resist deformation and damage when subjected to external forces, and can avoid displacement of the medical implant. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0047] Figure 1 The structure of the medical implant provided in this embodiment is shown in FIG. Figure 1 ;

[0048] Figure 2 The structure of the medical implant provided in this embodiment is shown in FIG. Figure 2 ;

[0049] Figure 3 The structure of the medical implant provided in this embodiment is shown in FIG. Figure 3 ;

[0050] Figure 4 A schematic cross-sectional view of a medical implant provided in this embodiment;

[0051] Figure 5 A schematic diagram of the projection of the second outer diameter section provided in this embodiment in the axis X direction of the medical implant;

[0052] Figure 6 A schematic diagram of a projection of the medical implant provided in this embodiment in the axis X direction of the medical implant;

[0053] Figure 7 A schematic diagram of the structure of the wire material of the medical implant provided in this embodiment;

[0054] Figure 8 A schematic diagram of the structure of the preparation jig provided in this embodiment;

[0055] Fig. 9 for Figure 8 A partial enlarged view of the middle A area;

[0056] Fig.10 An exploded schematic diagram of the preparation jig provided in this embodiment;

[0057] Fig.11 for Fig.10 A partial enlarged view of the middle B area;

[0058] Fig.12 for Fig.10 A partial enlarged view of the middle C area;

[0059] Fig.13 A schematic diagram of the structure of the mesh structure provided in this embodiment;

[0060] Fig.14 A schematic diagram of the structure of the shaping jig provided in this embodiment;

[0061] Fig.15 The structure of the medical implant provided in this embodiment is shown in FIG. Figure 4 .

[0062] Reference numerals:

[0063] 1- embolization section; 2- limiting section; 3- first resistant body; 4- second resistant body; 5- third resistant body; 6- developing member; 7- wire; 8- braiding fixture; 9- shaping fixture; 11- first outer diameter section; 12- second outer diameter section; 21- petal structure; 71- positioning assembly; 72- mesh braided body; 73- cross structure; 81- first braided part; 82- second braided part; 83- third braided part; 84- bracket; 85- axial boss assembly; 86- radial boss Column; 111-first outer diameter section one; 112-first outer diameter section two; 121-arc edge; 122-contact portion; 123-bending portion; 711-positioning portion; 811-first end of the first braided portion; 812-second end of the first braided portion; 851-axial boss; 7111-free end of the positioning portion; 7112-sub-positioning portion one; 7113-sub-positioning portion two; L1-first outer diameter; L2-second outer diameter; L3-third outer diameter; X-axis of the medical implant. DETAILED DESCRIPTION

[0064] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0065] In the description of the present application, it should be noted that the terms "vertical", "up", "down", "horizontal", 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.

[0066] In the description of this application, it should also be noted that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0067] like Figures 1 to 7 As shown, this embodiment provides a medical implant, which is made of wire material 7 and has an embolization segment 1 and two limit segments 2. The two ends of the embolization segment 1 are respectively connected to the two limit segments 2. The embolization segment 1 includes a first outer diameter segment 11 and a second outer diameter segment 12.

[0068] In the projection of the medical implant in the axis X direction, the first outer diameter section 11 has a first outer diameter L1, the second outer diameter section 12 has a second outer diameter L2, and the limiting section 2 has a third outer diameter L3; wherein L1<L2<L3.

[0069] This embodiment increases the local outer diameter of the embolization section 1 by designing the outer diameter of the first outer diameter section 11 and the second outer diameter section 12, thereby increasing the contact points / contact surfaces between the embolization section 1 and the part to be blocked, so that when the medical implant blocks the part to be blocked, it is in close contact with the part to be blocked, thereby improving the blocking effect of the medical implant. At the same time, when the medical implant blocks the part to be blocked, the medical implant and the part to be blocked form a high-strength structural connection, thereby improving the stability of the medical implant, helping to prevent the medical implant from shifting when the force or pressure changes (such as when the blood flows), thereby ensuring the durability and stability of the blocking effect. Moreover, the medical implant can better adapt to the part to be blocked with a complex or irregular shape, ensuring the integrity of the blocking, and further improving the blocking effect of the medical implant.

[0070] This embodiment designs the outer diameters of the first outer diameter section 11 and the limiting section 2 so that the limiting section 2 has a larger outer diameter, can provide better support and stronger structural strength, can adapt to the blocking environment under different pressures, and can be permanently connected to the end of the part to be blocked, ensuring the durability and stability of the blocking effect. At the same time, it can adapt to the parts to be blocked with different end shapes, achieve full coverage of the ends of the parts to be blocked, further improve the blocking effect, and thus reduce complications caused by incomplete blocking.

[0071] In this embodiment, the outer diameters of the second outer diameter section 12 and the limiting section 2 are designed so that the medical implant can pass through the parts to be blocked with complex or irregular shapes, and can adapt to the parts to be blocked with different end shapes, and can be permanently clamped to the ends of the parts to be blocked, thereby achieving a dual improvement in the blocking performance and stability performance of the medical implant.

[0072] In this embodiment, the outer diameters of the first outer diameter section 11, the second outer diameter section 12 and the limiting section 2 are designed to make the overall structure of the medical implant coordinated and unified, which is convenient for delivery by the delivery system; at the same time, it helps to enhance the stability of the structure, so that it can better resist deformation and damage when subjected to external forces, and can avoid displacement of the medical implant.

[0073] In an embodiment of the present invention, In another embodiment of the present invention,

[0074] In an embodiment of the present invention, In another embodiment of the present invention,

[0075] In an embodiment of the present invention, In another embodiment of the present invention,

[0076] In an embodiment of the present invention, the length of the medical implant in the direction of its axis X is between 10 mm and 60 mm.

[0077] In the embodiment of the present invention, the wire 7 is made of a degradable material, specifically a degradable PDO monofilament, but not limited thereto.

[0078] In the embodiment of the present invention, the limiting section 2 is disc-shaped and is clamped to the end of the portion to be blocked.

[0079] In the embodiment of the present invention, the limiting section 2 is a single-layer structure.

[0080] In various interventional embolization surgeries, for example, in vascular occlusion surgery, the limiting segment 2 has a unique design of a single-layer structure, which has higher flexibility compared to the traditional double-layer disc, so that it can better adapt to the natural shape and movement of the blood vessel, especially when facing a relatively weak blood vessel wall or an irregular shape of the blood vessel cavity. Moreover, the limiting segment 2 has a higher flexibility when it is a single-layer structure, which not only improves its adaptability in the blood vessel, but also helps to reduce the damage caused by the limiting segment 2 to the inner wall of the blood vessel, thereby reducing the possibility of postoperative thrombosis.

[0081] In addition, the single-layer structure of the limiting segment 2 can accelerate the endothelialization process of the limiting segment 2 in the patient's body, which means that the vascular endothelial cells can cover the surface of the mesh more quickly to form a protective endothelial layer, which helps prevent platelet aggregation and thrombosis, and also promotes the healing process of blood vessels. It helps to reduce the risk of postoperative complications and speed up the patient's recovery process.

[0082] Therefore, in practical applications, the limiting segment 2 is a single-layer structure, which can provide better in vivo adaptability and faster endothelialization, help improve the success rate of the operation, and bring better postoperative effects to patients.

[0083] like Figure 5 As shown, in an embodiment of the present invention, the projection of the second outer diameter section 12 in the axis X direction of the medical implant includes at least one arc edge 121. The present invention enables the second outer diameter section 12 to have an arc surface, reduces the sharpness of the second outer diameter section 12, enables the medical implant to better fit the part to be blocked through the second outer diameter section 12, and increases the contact area between the second outer diameter section 12 and the part to be blocked.

[0084] In an embodiment of the present invention, in the projection of the medical implant in the axis X direction, Figure 5As shown in A, the number of the arc edge 121 of the second outer diameter section 12 is one, and the arc of the arc edge 121 is 2π. In this embodiment, the outer periphery of the second outer diameter section 12 is circular in the projection of the axis X direction of the medical implant, so that the medical implant can evenly distribute the pressure when subjected to force, reducing the risk of damage to the medical implant caused by stress concentration. At the same time, it can completely fit the part to be blocked, form an effective seal, and avoid blood leakage.

[0085] like Figure 2 As shown, in the embodiment of the present invention, the two ends of the first outer diameter segment 11 are the first outer diameter segment 1 111 and the first outer diameter segment 2 112, the first outer diameter segment 1 111 and the first outer diameter segment 2 112 are respectively connected to the two limiting segments 2, and the middle portion of the first outer diameter segment 11 (i.e., the first outer diameter segment 11 located between the first outer diameter segment 1 111 and the first outer diameter segment 2 112) is wound along the axis X of the medical implant to form the second outer diameter segment 12.

[0086] Specifically, the second outer diameter section 12 is spiral.

[0087] In this embodiment, the middle portion of the first outer diameter section 11 is wound along the axis X of the medical implant to form a spiral second outer diameter section 12, which increases the contact points and contact surfaces between the second outer diameter section 12 and the part to be blocked, thereby increasing the friction between the second outer diameter section 12 and the part to be blocked, further improving the stability of the medical implant during blocking, and ensuring the durability and safety of the blocking.

[0088] Secondly, the second outer diameter section 12 of the present embodiment is spirally shaped, so the second outer diameter section 12 has gaps in its own spiral structure, which helps to promote the endothelialization process of the part to be blocked and accelerate tissue healing and recovery; and the second outer diameter section 12 can form a clearance space due to its own gaps, so it can flexibly adjust its own structure to adapt to different parts to be blocked according to the shape of the part to be blocked, ensuring precise fit to the part to be blocked, greatly improving the blocking effect.

[0089] Moreover, this embodiment can select the number of turns of the middle portion of the first outer diameter section 11 along the axis X of the medical implant, thereby adjusting the length of the second outer diameter section 12 to accommodate different lengths of the parts to be blocked, thereby expanding the application range of the medical implant.

[0090] Furthermore, in this embodiment, the middle portion of the first outer diameter segment 11 is wound along the axis X of the medical implant to form a spiral second outer diameter segment 12, so that the first outer diameter segment 11 and the second outer diameter segment 12 are integrally formed, simplifying the processing process and reducing the production difficulty.

[0091] In another embodiment of the present invention, the two ends of the first outer diameter section 11 are the first outer diameter section 1 111 and the first outer diameter section 2 112, the first outer diameter section 1 111 and the first outer diameter section 2 112 are respectively connected to the two limiting sections 2, and the middle part of the first outer diameter section 11 (that is, the first outer diameter section 11 located between the first outer diameter section 1 111 and the first outer diameter section 2 112) radially protrudes to form the second outer diameter section 12.

[0092] In this embodiment, the middle part of the first outer diameter section 11 is radially protruded to form the second outer diameter section 12, which increases the contact points and contact surfaces between the second outer diameter section 12 and the part to be blocked, thereby increasing the friction between the second outer diameter section 12 and the part to be blocked, further improving the stability of the medical implant during blocking, and ensuring the durability and safety of the blocking. In addition, the first outer diameter section 11 and the second outer diameter section 12 are integrally formed, simplifying the processing process and reducing the difficulty of production.

[0093] In another embodiment of the present invention, more than two contact portions 122 are provided in the middle of the first outer diameter segment 11, and the more than two contact portions 122 are arranged circumferentially along the middle of the first outer diameter segment 11 to form the second outer diameter segment 12, and in the projection of the axis X direction of the medical implant, two adjacent contact portions 122 partially overlap, so that the curvature of the arc side 121 of the second outer diameter segment 12 is 2π.

[0094] In this embodiment, the second outer diameter section 12 is formed by arranging two or more contact portions 122 in the middle of the first outer diameter section 11, thereby increasing the contact points and contact surfaces between the second outer diameter section 12 and the part to be blocked, thereby increasing the friction between the second outer diameter section 12 and the part to be blocked, further improving the stability of the medical implant during blocking, and ensuring the durability and safety of the blocking.

[0095] In another embodiment of the present invention, Figure 5 As shown in FIG. 1B , in the projection of the medical implant in the direction of the axis X, the number of the arc sides 121 of the second outer diameter section 12 is two, the two arc sides 121 are symmetrically arranged relative to the axis X of the medical implant, and the curvature of the arc sides 121 is between between.

[0096] In this embodiment, the two arc edges 121 are symmetrically arranged relative to the axis X of the medical implant, so that the medical implant can evenly distribute the pressure when subjected to stress, reducing the risk of damage to the medical implant due to stress concentration. The second outer diameter section 12 can block the part to be blocked in a larger range, thereby improving the blocking effect of the embolization section 1 on the part to be blocked and helping to reduce the risk of blood leakage.

[0097] In an embodiment of the present invention, the two arc edges 121 are symmetrically arranged relative to the axis X of the medical implant, and the curvature of the arc edges 121 is between between.

[0098] In another embodiment of the present invention, Figure 5 As shown in FIG. 1B , two contact portions 122 are disposed in the middle of the first outer diameter section 11, and the two contact portions 122 are symmetrically disposed along the first outer diameter section 11 to form the second outer diameter section 12, and in the projection of the medical implant in the axis X direction, the contact portion 122 has an arc edge 121, and the curvature of the arc edge 121 is between between.

[0099] In this embodiment, two symmetrically arranged contact portions 122 are arranged in the middle of the first outer diameter section 11, thereby increasing the contact points and contact surfaces between the second outer diameter section 12 and the part to be blocked, thereby increasing the friction between the second outer diameter section 12 and the part to be blocked, further improving the stability of the medical implant during blocking, and ensuring the durability and safety of the blocking; and the contact portion 122 has an arc-shaped surface with a large curvature, so that the second outer diameter section 12 can block the part to be blocked in a larger range, thereby improving the blocking effect of the embolization section 1 on the part to be blocked, and helping to reduce the risk of blood leakage.

[0100] In another embodiment of the present invention, Figure 5 As shown in FIG. 3 , in the projection of the medical implant in the direction of the axis X, the number of the arc edges 121 of the second outer diameter section 12 is more than three, and the more than three arc edges 121 are arranged in a circular array relative to the axis X of the medical implant, and the curvature of the arc edges 121 is between between.

[0101] In this embodiment, the three or more arc edges 121 are arranged in a circular array relative to the axis X of the medical implant, so that the medical implant can evenly distribute the pressure when subjected to stress, reducing the risk of damage to the medical implant due to stress concentration. Therefore, the second outer diameter section 12 can block the part to be blocked in a larger range, thereby improving the blocking effect of the embolization section 1 on the part to be blocked and helping to reduce the risk of blood leakage.

[0102] In another embodiment of the present invention, Figure 5 As shown in FIG. 3 , more than three contact portions 122 are arranged in the middle of the first outer diameter segment 11, and the more than three contact portions 122 are arranged in an annular array along the outer periphery of the first outer diameter segment 11 to form the second outer diameter segment 12, and in the projection on the axis X direction of the medical implant, the contact portion 122 has an arc edge 121, and the curvature of the arc edge 121 is between Between.

[0103] In this embodiment, by setting more than three contact portions 122 in the middle of the first outer diameter section 11, the contact points and contact surfaces between the second outer diameter section 12 and the part to be blocked are increased, thereby increasing the friction between the second outer diameter section 12 and the part to be blocked, further improving the stability of the medical implant during blocking, and ensuring the durability and safety of the blocking; and the more than three contact portions 122 all have an arc surface, so that the second outer diameter section 12 can block the part to be blocked in a larger range, thereby improving the blocking effect of the embolization section 1 on the part to be blocked, and helping to reduce the risk of blood leakage.

[0104] like Figure 4 As shown, in the embodiment of the present invention, the medical implant is provided with a first bluff body 3 and a second bluff body 4, the first bluff body 3 is located in the first outer diameter section 11, and the second bluff body 4 is located in the second outer diameter section 12. In this embodiment, by providing the first bluff body 3 and the second bluff body 4, the ability of the embolization section 1 to block abnormal blood is increased, and the blocking effect of the medical implant is further improved.

[0105] In the embodiment of the present invention, the first bluff body 3 and the second bluff body 4 are both made of degradable materials. Specifically, the first bluff body 3 and the second bluff body 4 are both made of poly (L-lactide-co-ε-caprolactone), but not limited thereto.

[0106] In the embodiment of the present invention, when the second outer diameter section 12 is formed by winding the middle portion of the first outer diameter section 11 along the axis X of the medical implant, the second outer diameter section 12 includes at least three bends 123 , and a second bluff body 4 is disposed between two adjacent bends 123 .

[0107] The present invention provides a second bluff body 4 between two adjacent bends 123, so that the second outer diameter section 12 can enhance the ability to block abnormal blood through the second bluff body 4, thereby improving the accuracy and effectiveness of the plugging. At the same time, the second bluff body 4 can provide a stable growth environment for endothelial cells, thereby accelerating tissue healing. In addition, since the bluff body is not provided at the bend, the second outer diameter section 12 still has good flexibility, and can flexibly adjust its own structure to adapt to different parts to be blocked according to the shape of the part to be blocked, ensuring accurate fit to the part to be blocked, and greatly improving the blocking effect.

[0108] like Figure 1 and Fig.12 As shown, in an embodiment of the present invention, the limiting section 2 is a single-layer body composed of a plurality of petal-like structures 21, and the plurality of petal-like structures 21 are arranged along the circumference of the medical implant, and the petal-like structures 21 partially overlap with the adjacent petal-like structures 21 to form the single-layer body.

[0109] The limiting segment 2 provided in this embodiment is a single-layer body composed of a plurality of petal-shaped structures 21, which has higher flexibility than the traditional double-layer disc-shaped body, so that the medical implant can better adapt to the natural shape and movement of the tissue in the body, especially when facing relatively weak tissue walls or irregularly shaped defects. It also helps to reduce the damage caused by the limiting segment 2 to the tissue wall, thereby reducing the possibility of postoperative thrombosis.

[0110] In addition, the single-layer structure of the limiting segment 2 can also speed up the endothelialization process of the limiting segment 2 in the patient's body, allowing the vascular endothelial cells to cover the surface of the mesh more quickly to form a protective endothelial layer, which helps prevent platelet aggregation and thrombosis, and also promotes the healing process of blood vessels. It helps to reduce the risk of postoperative complications and speed up the patient's recovery process.

[0111] In this embodiment, the petal-like structure 21 partially overlaps with the adjacent petal-like structure 21, so that the two adjacent petal-like structures 21 form a stable support structure, thereby improving the structural strength of the limiting segment 2, allowing the limiting segment 2 to withstand greater pressure, and reducing the risk of deformation and displacement caused by heart beating or blood flow. At the same time, long-term heart beating and blood flow will produce continuous fatigue stress on the limiting segment 2. In this embodiment, the petal-like structure 21 partially overlaps with the adjacent petal-like structure 21 to disperse the fatigue stress, thereby improving the fatigue resistance of the limiting segment 2 and ensuring its stability and reliability in long-term use.

[0112] Specifically, in the projection of the medical implant in the axis X direction, the area of ​​the petal-shaped structure 21 is between 3 mm 2 ~80mm 2 , the ratio of the overlapping area of ​​the petal-like structure 21 and its adjacent petal-like structure 21 is between

[0113] In this embodiment, the area of ​​the petal-shaped structure 21 is between 3 mm 2 ~80mm 2 , avoid the petal-like structure 21 being too large, resulting in the outer diameter of the limiting section 2 being too large, which in turn causes the overall volume of the medical implant to be too large and inconvenient to transport; at the same time, avoid the petal-like structure 21 being too small, resulting in the outer diameter of the limiting section 2 being too small, which in turn causes poor stability of the limiting section 2 and displacement of the medical implant.

[0114] Furthermore, in this embodiment, the ratio of the overlapping area between the petal-shaped structure 21 and its adjacent petal-shaped structure 21 is between Avoid the overlapping area of ​​adjacent petal-like structures 21 being too large, resulting in poor flexibility of the limiting section 2, which in turn causes inconvenience in transporting the medical implant; at the same time, avoid the overlapping area of ​​adjacent petal-like structures 21 being too small, resulting in poor structural stability of the limiting section 2, which in turn causes displacement of the medical implant.

[0115] In the embodiment of the present invention, the ratio of the overlapping area of ​​the petal-like structure 21 and its adjacent petal-like structure 21 is between

[0116]

[0117] like Figure 1 , 2 , 4 and 6, in the embodiment of the present invention, the medical implant is provided with a third bluff body 5, and the third bluff body 5 is located on the side of the limiting section 2 away from the embolization section 1. By providing the third bluff body 5, the present embodiment increases the ability of the limiting section 2 to block abnormal blood, and further improves the blocking effect of the medical implant.

[0118] In an embodiment of the present invention, Figure 6 As shown, the ratio of the projection area of ​​the third bluff body 5 in the axis X direction of the medical implant to the projection area of ​​the limiting segment 2 in the axis X direction of the medical implant is between In this embodiment, by making the third baffle body 5 completely cover the limiting section 2 or cover most of the limiting section 2, the ability of the limiting section 2 to block abnormal fluid is further increased, and the blocking effect of the medical implant is further improved.

[0119] In the embodiment of the present invention, the thickness of the limiting segment 2 is between 0.25 mm and 0.6 mm, and the thickness of the third bluff body 5 is between 0.1 mm and 0.3 mm. In this embodiment, the thickness of the limiting segment 2 is increased by providing the third bluff body 5, thereby improving the structural strength of the limiting segment 2, so that the limiting segment 2 can withstand greater pressure, and reduce the risk of deformation and displacement caused by heart beating or blood flow.

[0120] In the embodiment of the present invention, the third bluff body 5 is made of a degradable material, specifically, the third bluff body 5 is made of poly (L-lactide-co-ε-caprolactone), but not limited thereto.

[0121] In the embodiment of the present invention, the third baffle body 5 is a melt-blown mesh structure.

[0122] In the embodiment of the present invention, the ratio of the projection area of ​​the third baffle body 5 in the axis X direction of the medical implant to the projection area of ​​the limiting segment 2 in the axis X direction of the medical implant is between:

[0123] In an embodiment of the present invention, when the ratio of the projection area of ​​the third bluff body 5 in the axis X direction of the medical implant to the projection area of ​​the limiting segment 2 in the axis X direction of the medical implant is greater than 1, the edge of the third bluff body 5 is folded to surround the outer periphery of the limiting segment 2, thereby increasing the fixing strength between the third bluff body 5 and the limiting segment 2, preventing the third bluff body 5 on the limiting segment 2 from falling off, thereby weakening the blocking effect of the medical implant.

[0124] like Figure 7 As shown, in an embodiment of the present invention, one or more positioning components 71 are provided on the wire 7 , and the positioning components 71 include two or more positioning portions 711 , and the free ends 7111 of the positioning portions are arranged in a direction away from the wire 7 .

[0125] In this embodiment, the physical contact area between the medical implant and the part to be blocked is increased by providing the positioning portion 711, thereby providing a stronger anchoring effect; at the same time, the friction between the medical implant and the part to be blocked is increased, making it difficult for the medical implant to be pushed by blood flow or heart movement; therefore, this embodiment helps to ensure that the medical implant maintains a stable position in the heart, reducing the risk of displacement of the medical implant due to heart beating or blood flow.

[0126] In the embodiment of the present invention, there are more than two positioning components 71, and the length of the wire 7 between two adjacent positioning components 71 is between 5 mm and 100 mm. This embodiment avoids excessive density of positioning components 7 on the wire and reduces the difficulty of weaving the wire 7.

[0127] In the embodiment of the present invention, the distance between the free end 7111 of the positioning portion and the wire 7 is between 0.05 mm and 1 mm.

[0128] In the embodiment of the present invention, the number of the positioning portions 711 of each positioning assembly 71 is between 5 and 10.

[0129] In an embodiment of the present invention, Figure 7 As shown, the outer diameter of the positioning portion 711 gradually decreases in the direction away from the wire 7. This embodiment facilitates the positioning portion 711 to stably contact the part to be blocked, thereby providing a stronger anchoring effect.

[0130] In an embodiment of the present invention, the plurality of positioning portions 711 are arranged in a ring array in the projection of the medical implant in the direction of the axis X. This embodiment enables the plurality of positioning portions 711 to be evenly distributed in the circumferential direction of the medical implant, thereby further enhancing the anchoring effect and further increasing the friction between the medical implant and the part to be blocked.

[0131] In the embodiment of the present invention, the positioning portion 711 is located on the side of the wire 7 away from the axis X of the medical implant. This embodiment facilitates the positioning portion 711 to contact the part to be blocked, thereby providing a stronger anchoring effect and increasing the friction between the medical implant and the part to be blocked.

[0132] In another embodiment of the present invention, the positioning portion 711 includes a sub-positioning portion 1 7112 and a sub-positioning portion 2 7113, and the sub-positioning portion 1 7112 and the sub-positioning portion 2 7113 are arranged on both sides of the wire 7, and the distance between the free end of the sub-positioning portion 1 7112 and the wire 7 is between 0.05 mm and 1 mm, and the distance between the free end of the sub-positioning portion 2 7113 and the wire 7 is between 0.05 mm and 1 mm. This embodiment reduces the difficulty of weaving the wire 7 to form a medical implant, and at the same time facilitates the contact between the positioning portion 711 and the part to be blocked.

[0133] like Figure 1-4 As shown, in an embodiment of the present invention, the first outer diameter section 11 is provided with a developing member 6, and the developing member 6 is arranged around the outer circumference of the first outer diameter section 11; by providing the developing member 6, this embodiment facilitates the positioning of the medical implant during the operation; at the same time, providing the developing member 6 increases the outer diameter of the first outer diameter section 11 area, thereby improving the structural strength of the first outer diameter section 11.

[0134] The developing member 6 is close to the limiting segment 2, and the distance between the developing member 6 and the limiting segment 2 is between 0.4 mm and 5 mm. In this embodiment, the developing member 6 is close to the limiting segment 2, and the developing member 6 is wound around the outer circumference of the first outer diameter segment 11, thereby improving the structural strength of the first outer diameter segment 11 and the limiting segment 2, and improving the deformation resistance of the first outer diameter segment 11 and the limiting segment 2.

[0135] In the embodiment of the present invention, the developing member 6 is made of a degradable material, specifically, the developing member 6 is made of a degradable biomedical magnesium alloy material, but not limited thereto.

[0136] like Figure 8-12 As shown, this embodiment further provides a medical implant weaving jig 8, which is used to weave the medical implant described in any of the above embodiments, comprising:

[0137] Bracket 84;

[0138] The first braided portion 81 is movably disposed on the bracket 84. The first end 811 of the first braided portion is provided with a plurality of radial protrusions 86 (A1, A2...A 2n ), and a first gap (a1, a2...a1) is formed between two adjacent radial protrusions 86. 2n ), the second end 812 of the first braided portion is also provided with a plurality of radial protrusions 86 (B1, B2...B2n ), and a second gap (b1, b2...b 2n );

[0139] The second part 82 is movably arranged on the bracket 84. The second part 82 is close to the first end 811 of the first part. The second part 82 is provided with a plurality of axial boss components 85 (C1, C2...C n );

[0140] The third braided portion 83 is movably disposed on the bracket 84. The third braided portion 83 is close to the second end 812 of the first braided portion. The third braided portion 83 is also provided with a plurality of axial boss components 85 (D1, D2...D n ).

[0141] The medical implant obtained by the braided jig 8 of the medical implant provided in this embodiment can block parts to be blocked with complex or irregular shapes, and can adapt to parts to be blocked with different end shapes, and can be permanently clamped to the ends of the parts to be blocked, thereby achieving a dual improvement in the blocking performance and stability performance of the medical implant.

[0142] In the embodiment of the present invention, the first weaving part 81, the second weaving part 82 and the third weaving part 83 are movably arranged on the bracket 84, so that the weaving person can weave the medical implant with the embolization section 1 of corresponding length according to the actual production requirements, thereby expanding the scope of application.

[0143] In an embodiment of the present invention, the first braided portion 81, the second braided portion 82 and the third braided portion 83 are detachably arranged on the bracket 84, so that the braider can install the corresponding first braided portion 81, the second braided portion 82 and the third braided portion 83 on the bracket 84 according to the size of the medical implant to be braided, thereby expanding the scope of application.

[0144] In the embodiment of the present invention, the radial protrusions 86 (A1, A2...A 2n ) and the radial protrusions 86 (B1, B2...B 2n ) have the same structure.

[0145] In the embodiment of the present invention, the axial boss assembly 85 (C1, C2...C n ) and the axial boss assembly 85 (D1, D2...D n ) have the same structure.

[0146] In the embodiment of the present invention, 8 to 20 axial boss assemblies 85 are disposed on the second braided portion 82 .

[0147] In the embodiment of the present invention, 8 to 20 axial boss assemblies 85 are disposed on the third braided portion 83 .

[0148] In the embodiment of the present invention, the axial boss assembly 85 is detachably disposed on the second braided portion 82 , so as to facilitate the removal of the obtained mesh braided body 72 from the second braided portion 82 after the braiding is completed.

[0149] In the embodiment of the present invention, the axial boss assembly 85 is detachably disposed on the third braided portion 83 , so as to facilitate the removal of the obtained mesh braided body 72 from the third braided portion 83 after the braiding is completed.

[0150] like Fig. 9 As shown, the axial boss assembly 85 includes more than three axial bosses 851 , so that the wire 7 is sequentially wound around more than three axial bosses 851 to form a petal-shaped structure 21 .

[0151] In the embodiment of the present invention, the number of axial bosses 851 of the axial boss assembly 85 is 2M+1, where M≥2, and 2M+1 axial bosses 851 are sequentially arranged on the second braided portion 82, so that the wire 7 is sequentially wound around 2M+1 axial bosses 851 to form a petal-shaped structure 21, and the axial bosses 851 of the axial boss assembly 85 are sorted in ascending order according to their center distance from the second braided portion 82, wherein the axial boss 851 with a serial number of M is a common axial boss 851 of two adjacent axial boss assemblies 85. The structure of the axial boss assembly 85 on the third braided portion 83 is consistent with that of the axial boss assembly 85 on the second braided portion 82, and will not be repeated here.

[0152] like Fig.11 and 12 As shown, in the embodiment of the present invention, a plurality of radial protrusions 86 (A1, A2...A 2n ) are evenly distributed along the circumference of the first end 811 of the first braided portion, and a plurality of radial protrusions 86 (B1, B2...B 2n ) are evenly distributed along the circumference of the second end 812 of the first braided portion; the radial protrusion 86 structure is used to position the braided wire 7 to prevent the wire 7 from shifting and causing disorder in the braiding.

[0153] Specifically, Fig.10 As shown, the wire 7 that has not bypassed the axial boss assembly 85 and the wire 7 that has bypassed the axial boss assembly 85 form a cross structure 73 , and the cross structure 73 is located between the radial boss 86 and the axial boss assembly 85 .

[0154] like Figure 8-15As shown, this embodiment further provides a method for preparing a medical implant, using the medical implant preparation jig 8 as described in any of the above embodiments to prepare the medical implant as described in any of the above embodiments, the method comprising:

[0155] Assembling the first weaving part 81, the second weaving part 82 and the third weaving part 83 based on the size of the medical implant to be weaved;

[0156] One end of the wire 7 is fixed to the first braided portion 81, and the other end of the wire 7 is arranged according to a1, C1, a4, b1, D1, b4, a3, C2, a6, b3, D2, b6...a 2(n-1)-1 , C n-1 、a 2n 、b 2(n-1)-1 , D n-1 、b 2n 、a 2n-1 , C n , a2, b 2n-1 , D n , b2, and sequentially passes through a plurality of radial bosses 86 and a plurality of axial boss assemblies 85 to form a mesh braided body 72; wherein the wire 7 between the radial boss 86 at the first end 811 of the first braided portion and the radial boss 86 at the second end 812 of the first braided portion is wound along the outer circumference of the first braided portion 81; wherein, during the braiding process, the wire 7 is interwoven and passed through the braided paths;

[0157] The braiding jig 8 is removed, and the mesh braided body 72 is placed into a shaping jig 9 for shaping, thereby obtaining a medical implant.

[0158] The medical implant prepared by the preparation method of the medical implant provided in this embodiment can block parts to be blocked with complex or irregular shapes, can adapt to parts to be blocked with different end shapes, and can be permanently clamped to the ends of the parts to be blocked, thereby achieving a dual improvement in the blocking performance and stability performance of the medical implant.

[0159] Among them, after passing through a1, C1, and a4, the wire forms a petal-shaped structure of the limiting section located at the first end of the embolization section, and after passing through b1, D1, and b4, the wire forms a petal-shaped structure of the limiting section located at the second end of the embolization section.

[0160] Specifically, when n=10, the weaving order of the mesh braided body is as shown in the following table, wherein the wires are woven in a Z-shaped order according to the following table, that is, the last one in one row is adjacent to the first one in the next row:

[0161] Table: Order of weaving mesh when n=10

[0162]

[0163]

[0164] In an embodiment of the present invention, “removing the braiding jig 8, placing the mesh braided body 72 into the shaping jig 9 for shaping, and obtaining a medical implant” includes:

[0165] The knitting jig 8 and the mesh knitted body 72 are heated at 80°C to 100°C for 10 to 60 minutes to pre-shape the mesh knitted body 72;

[0166] Remove the weaving jig, put the mesh woven body 72 into the shaping jig 9 and heat it at 80°C to 110°C for 30 to 60 minutes to shape the mesh woven body 72;

[0167] The shaping fixture 9 is removed to obtain the medical implant.

[0168] Note that the above are only preferred embodiments of the present application and the technical principles used. Those skilled in the art will understand that the present application is not limited to the specific embodiments herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present application. Therefore, although the present application is described in more detail through the above embodiments, the present application is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present application, and the scope of the present application is determined by the scope of the appended claims.

[0169] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A medical implant, characterized in that: The medical implant is made of degradable wire material, and comprises an embolization section and two limiting sections, two ends of the embolization section are respectively connected to the two limiting sections, and the embolization section comprises a first outer diameter section and a second outer diameter section; In the projection of the medical implant in the axial direction, the first outer diameter section has a first outer diameter L1, the second outer diameter section has a second outer diameter L2, and the limiting section has a third outer diameter L3; wherein L1<L2<L3.

2. The medical implant according to claim 1, characterized in that The projection of the second outer diameter section in the axial direction of the medical implant includes at least one arc edge; When the number of the arc side is one, the radian of the arc side is 2π; When the number of the arcuate sides is two, the two arcuate sides are symmetrically arranged relative to the axis of the medical implant, and the curvature of the arcuate sides is between between; When the number of the arc sides is more than three, the more than three arc sides are arranged in a circular array relative to the axis of the medical implant, and the curvature of the arc sides is between between.

3. The medical implant according to claim 1 or 2, characterized in that The two ends of the first outer diameter segment are respectively connected to the two limit segments; the middle part of the first outer diameter segment is wound along the axis of the medical implant to form the second outer diameter segment; or, the middle part of the first outer diameter segment radially protrudes to form the second outer diameter segment; or, the middle part of the first outer diameter segment is provided with two or more contact portions, and the two or more contact portions are circumferentially arranged along the middle part of the first outer diameter segment to form the second outer diameter segment; And / or, the first outer diameter L1, the second outer diameter L2 and the third outer diameter L3 satisfy:

4. The medical implant according to claim 3, characterized in that The medical implant is provided with a first bluff body and a second bluff body, the first bluff body is located in the first outer diameter section, and the second bluff body is located in the second outer diameter section; When the second outer diameter section is formed by winding the middle portion of the first outer diameter section along the axis of the medical implant, the second outer diameter section includes at least three bending portions, and the second bluff body is disposed between two adjacent bending portions.

5. The medical implant according to claim 1, characterized in that The limiting section is a single-layer body composed of a plurality of petal-like structures, wherein the plurality of petal-like structures are arranged along the circumference of the medical implant, and the petal-like structures partially overlap with adjacent petal-like structures to form the single-layer body; In the projection along the axis of the medical implant, the area of ​​the petal-shaped structure is between 3 mm 2 ~80mm 2 The ratio of the overlapping area of ​​the petal-like structure to its adjacent petal-like structure is between 6. The medical implant according to claim 1, characterized in that The medical implant is provided with a third bluff body, and the third bluff body is located on a side of the limiting section away from the embolization section; The ratio of the projection area of ​​the third bluff body in the axial direction of the medical implant to the projection area of ​​the limiting section in the axial direction of the medical implant is between: And / or, the thickness of the limiting section is between 0.25 mm and 0.6 mm, and the thickness of the third bluff body is between 0.1 mm and 0.3 mm; and / or, the third bluff body is made of a degradable material, and the third bluff body is a melt-blown mesh structure.

7. The medical implant according to claim 1, characterized in that The wire is provided with one or more positioning components; the positioning components include two or more positioning parts, and the free ends of the positioning parts are arranged in a direction away from the wire.

8. The medical implant according to claim 7, characterized in that The number of the positioning components is more than two, and the length of the wire between two adjacent positioning components is between 5 mm and 100 mm; And / or, the distance between the free end of the positioning portion and the wire is between 0.05 mm and 1 mm; And / or, the outer diameter of the positioning portion gradually decreases in a direction away from the wire; And / or, the plurality of positioning portions are arranged in a ring array in a projection on the axial direction of the medical implant; And / or, the positioning portion is located on a side of the wire away from the axis of the medical implant; or the positioning portion includes a sub-positioning portion one and a sub-positioning portion two, and the sub-positioning portion one and the sub-positioning portion two are relatively arranged on both sides of the wire, and the distance between the free end of the sub-positioning portion one and the wire is between 0.05mm and 1mm, and the distance between the free end of the sub-positioning portion two and the wire is between 0.05mm and 1mm.

9. The medical implant according to claim 1, characterized in that The first outer diameter section is provided with a developing member, and the developing member is arranged around the outer circumference of the first outer diameter section; Wherein, the developing component is close to the limiting section, and the distance between the developing component and the limiting section is between 0.4 mm and 5 mm.

10. A braided jig for medical implants, characterized in that: Used to prepare the medical implant according to any one of claims 1 to 9, comprising: Bracket; A first braided part, the first braided part is movably arranged on the bracket, and a first end of the first braided part is provided with a plurality of radial protrusions (A1, A2...A 2n ), and a first gap (a1, a2...a1) is formed between two adjacent radial protrusions. 2n ), the second end of the first braided portion is also provided with a plurality of radial protrusions (B1, B2...B 2n ), and a second gap (b1, b2...b 2n ); The second braided part is movably arranged on the bracket, the second braided part is close to the first end of the first braided part, and the second braided part is provided with a plurality of axial boss components (C1, C2...C n ); The third braided part is movably arranged on the bracket, the third braided part is close to the second end of the first braided part, and the third braided part is also provided with a plurality of axial boss components (D1, D2...D n ).

11. A method for preparing a medical implant, characterized in that: Using the braided jig of the medical implant as claimed in claim 10, the method comprises: Assembling the first braided part, the second braided part, and the third braided part based on the size of the medical implant to be braided; One end of the wire is fixed to the first braided part, and the other end of the wire is arranged according to a1, C1, a4, b1, D1, b4, a3, C2, a6, b3, D2, b6...a 2(n-1)-1 , C n-1 、a 2n , b 2(n-1)-1 , D n-1 , b 2n 、a 2n-1 , C n , a2, b 2n-1 , D n , b2, and sequentially pass through a plurality of radial bosses and a plurality of axial boss assemblies to form a mesh braided body; wherein the wire material located between the radial boss at the first end of the first braided part and the radial boss at the second end of the first braided part is wound along the outer circumference of the first braided part; wherein, during the braiding process, the wire material is interwoven and passed through the braided paths; The braiding jig is removed, and the mesh braided body is placed into a shaping jig for shaping, thereby obtaining the medical implant.

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