Plugging device

Abstract

The utility model relates to the technical field of medical apparatus and instruments, and provides a plugging device which comprises a woven mesh tube provided with a far-end part, a tube body part and a tightening part; the far end part is of a continuous annular structure; the far-end part and the far-end part of the tube body part form a first plugging part; the converging part and the near end part of the tube body part form a second plugging part; the rest part of the tube body part forms a waist part for connecting the first plugging part and the second plugging part; and the tightening part is arranged in the fastener in a sleeving manner. According to the plugging device provided by the utility model, the first plugging part does not need to adopt a fastener for binding, so that the plugging device is of a single-rivet structure, the metal implantation amount can be reduced, the risk of thrombus formation caused by excessive metal implants remained in a human body is avoided, and the metal implants are prevented from slowing down growth and climbing of tissues and endothelialization.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, specifically to an occluder. Background Technology

[0002] Occluders, as implantable devices used in interventional therapy, are widely used in clinical practice to treat patent foramen ovale (PFO), atrial septal defect (ASD), ventricular septal defect (VSD), and patent ductus arteriosus (PDA). The main principle of PFO occluders is to use mechanical structures to block the "holes" between the left and right ventricles, between the left and right atria, and between the aorta and pulmonary artery.

[0003] The sealing device is used to seal the openings in the body. It is usually made of braided wire into a mesh tube, and both ends of the mesh tube need to be fixed with rivets.

[0004] When multiple prongs of existing occluders are exposed to the bloodstream, the prongs hinder the climbing and endothelialization of human tissues after implantation, and thrombi are easily formed at the prongs. After the thrombi flow into the brain, they can easily block blood vessels, induce stroke, and endanger human health. Utility Model Content

[0005] Therefore, it is necessary to provide an occluder that addresses the problem of existing occluders having multiple protruding rivets that are not conducive to endothelialization and are prone to thrombosis.

[0006] To solve the above-mentioned technical problems, the technical solution of this utility model is as follows:

[0007] On one hand, this utility model provides a sealing device, including a braided mesh tube having a distal end, a tube body, and a converging part; the distal end has a continuous annular structure; the distal end and the distal portion of the tube body constitute a first sealing part; the converging part and the proximal portion of the tube body constitute a second sealing part; the remaining portion of the tube body constitutes a waist connecting the first sealing part and the second sealing part; the converging part is sleeved in a fastener.

[0008] Furthermore, the braided mesh tube is formed by alternating weaving of multiple braided threads, each braided thread including a bent section and a main body section; the bent sections of two adjacent braided threads overlap vertically; the distal end is a continuous ring structure formed by the sequential overlapping and connection of the bent sections of the multiple braided threads; and the tube body is a mesh structure formed by the collection of the main body sections of the multiple braided threads.

[0009] Furthermore, the first main body segments of two adjacent braided threads are parallel to each other; the second main body segments of two adjacent braided threads are parallel to each other; and the first main body segment of a braided thread intersects with the second main body segment of its adjacent braided thread.

[0010] Furthermore, the occluder has an initial state, a transition state, and a stretched state; in the initial state, the first occluder and the second occluder are disc-shaped; in the transition state, a first expansion portion is formed between the first occluder and the distal end of the waist portion, and a second expansion portion is formed between the second occluder and the proximal end of the waist portion; in the stretched state, the maximum outer diameter of the first expansion portion and the second expansion portion is stretched to its minimum.

[0011] Furthermore, the maximum outer diameter of the first sealing part is greater than the maximum outer diameter of the waist part.

[0012] Furthermore, the maximum outer diameter of the first sealing part is smaller than the maximum outer diameter of the second sealing part, and the waist part is cylindrical.

[0013] Furthermore, the maximum outer diameter of the first sealing part is greater than or equal to the maximum outer diameter of the second sealing part, and the waist part is in the shape of a straight cylinder or an oblique cylindrical shape.

[0014] Furthermore, the maximum outer diameter of the second sealing portion is less than or equal to the maximum outer diameter of the waist portion.

[0015] Furthermore, the top two sides of the first sealing part are designed with rounded chamfered structures.

[0016] Furthermore, the fastener includes a ring and a nut, with the nut fitted over the ring.

[0017] The technical solution of this utility model has the following advantages:

[0018] The occluder provided by this utility model does not require fasteners for the first occlusion part, making the occluder a single-riveted structure. This reduces the amount of metal implanted, avoids the risk of thrombosis caused by excessive metal implants in the human body, and prevents metal implants from slowing down tissue growth and endothelialization. Attached Figure Description

[0019] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of a braided mesh tube in one embodiment of the present invention;

[0021] Figure 2This is a partial structural diagram of the braided mesh tube in one embodiment of the present invention;

[0022] Figure 3 This is a schematic diagram of the distal end of the braided mesh tube in one embodiment of the present invention;

[0023] Figure 4 This is a schematic diagram of a single braided thread in a braided mesh tube according to one embodiment of the present invention;

[0024] Figure 5 This is a schematic diagram showing the positional relationship of multiple braided threads in a braided mesh tube according to one embodiment of the present invention.

[0025] Figure 6 A schematic diagram showing the positional relationship between the internal braiding mechanism and the external disc mechanism in the braiding device used in the manufacturing method of the occluder in this embodiment of the utility model;

[0026] Figure 7 A schematic diagram of the sleeve portion of the braiding device used in the manufacturing method of the plugging device in this embodiment of the utility model.

[0027] Figure 8 This is a schematic diagram of the plugging device in one embodiment of the present invention;

[0028] Figure 9 This is a schematic diagram of the first blocking part of the blocking device in one embodiment of the present invention;

[0029] Figure 10 This is a schematic diagram of the second blocking part of the blocking device in one embodiment of the present invention;

[0030] Figure 11 This is a schematic diagram of the plugging device in another embodiment of the present invention;

[0031] Figure 12 This is a schematic diagram of the plugging device in another embodiment of the present invention;

[0032] Figure 13 This is a schematic diagram of the plugging device in another embodiment of the present invention;

[0033] Figure 14 This is a schematic diagram of the plugging device in another embodiment of the present invention;

[0034] Figure 15 This is a schematic diagram of the first blocking part of the blocking device in another embodiment of the present utility model;

[0035] Figure 16 This is a schematic diagram of the plugging device in another embodiment of the present invention;

[0036] Figure 17This is a schematic diagram of the second sealing part of the sealing device in another embodiment of the present invention;

[0037] Figure 18 This is a schematic diagram of the plugging device in another embodiment of the present invention;

[0038] Figure 19 This is a schematic diagram of the second sealing part of the sealing device in another embodiment of the present invention;

[0039] Figure 20 This is a schematic diagram of the occluder in its original state according to one embodiment of the present invention;

[0040] Figure 21 This is a schematic diagram of the plugging device in a transition state according to one embodiment of the present invention;

[0041] Figure 22 This is a schematic diagram of the plugging device in a stretched state according to one embodiment of the present invention.

[0042] Explanation of reference numerals in the attached figures:

[0043] 1. Distal end; 101. Continuous ring structure; 2. Tube body; 201. Distal portion of the tube body; 202. Proximal portion of the tube body; 203. Remaining portion of the tube body; 3. Convergence section; 4. Braided thread; 5. Bending section; 6. Main body section; 7. First main body section; 8. Second main body section; 9. External disc mechanism; 10. Hook mechanism; 11. Internal braiding mechanism; 12. Groove; 13. Cylinder; 14. Sleeve; 15. Metal gasket; 16. First ring; 17. Auxiliary rod; 18. Seal; 19. First sealing part; 20. Second sealing part; 21. Fastener; 22. Waist; 2201. Distal end of the waist; 2202. Proximal end of the waist; 23. Rounded chamfer structure; 24. First expansion part; 25. Second expansion part. Detailed Implementation

[0044] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0045] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model 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, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0046] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0047] Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0048] This embodiment provides a braided mesh tube, such as Figure 1 , Figure 2 , Figure 3 , Figure 4 as well as Figure 5 As shown, the structure is formed by alternating weaves of multiple braided threads 4, including a distal end 1, a tube body 2, and a gathering part 3. Each braided thread 4 includes a bent section 5 and a main body section 6. For example, when a braided thread 4 is folded in half from the middle, the thread near the fold is the bent section 5, and the remaining portion is the main body section 6. The bent sections 5 of adjacent braided threads 4 overlap vertically; for example, the bent section 5 of a later braided thread 4 can be placed on top of the bent section 5 of a previous braided thread 4, and so on.

[0049] The distal end 1 of the braided mesh tube is a continuous ring structure 101 formed by the overlapping and connecting of multiple braided wires 4 bent sections 5; the tube body 2 is a mesh structure formed by the collection of multiple braided wires 4 main body sections 6.

[0050] The main body segment 6 includes a first main body segment 7 and a second main body segment 8. For the same braided thread 4, after folding, it forms two strands, one of which is designated as the first main body segment 7, and the other as the second main body segment 8. The first main body segments 7 of adjacent braided threads 4 are parallel to each other; the second main body segments 8 of adjacent braided threads 4 are also parallel to each other, and the first main body segment 7 of any braided thread 4 intersects with the second main body segment 8 of its adjacent braided thread 4. In this embodiment, the tube body 2 of the braided mesh tube can form a uniform mesh structure, resulting in better mechanical properties of the entire braided mesh tube.

[0051] In this embodiment, the proximal end is the end that is closer to the operator during use, and the distal end is the end that is farther away from the operator.

[0052] Another embodiment also provides a occluder 18, such as Figure 8 , Figure 9 , Figure 10 As shown, it includes a braided mesh tube having a distal end 1, a tube body 2, and a constriction portion 3; the distal end 1 is a continuous annular structure 101; the distal end 1 and the distal portion 201 of the tube body constitute a first sealing portion 19; the constriction portion 3 and the proximal portion 202 of the tube body constitute a second sealing portion 20; the remaining portion 203 of the tube body constitutes a waist portion 22 connecting the first sealing portion 19 and the second sealing portion 20; the constriction portion 3 is fitted in a fastener 21.

[0053] In this embodiment, the fastener 21 may include a second ring and a nut; the second ring binds the constriction portion 3; the nut may be sleeved on the outside of the second ring for connecting the occluder 18 to an external surgical instrument. In this embodiment, the first occlusion portion 19 of the occluder 18 does not require the fastener 21 to be constricted, making the occluder 18 a single-riveted structure. This reduces the amount of metal implanted, avoids the risk of thrombosis caused by excessive metal implants remaining in the body, and prevents metal implants from slowing down tissue growth and endothelialization.

[0054] The braided mesh tube is made of multiple braided lines 4 that are alternately woven in sequence. Each braided line 4 includes a bent section 5 and a main body section 6. The bent sections 5 of two adjacent braided lines 4 overlap vertically. The distal end 1 is a continuous ring structure 101 formed by the overlapping and connection of the bent sections 5 of multiple braided lines 4. The tube body 2 is a mesh structure formed by the collection of the main body sections 6 of multiple braided lines 4.

[0055] In this embodiment, the main body segment 6 includes a first main body segment 7 and a second main body segment 8. The first main body segments 7 of two adjacent braided lines 4 are parallel to each other; the second main body segments 8 of two adjacent braided lines 4 are parallel to each other, and the first main body segment 7 of the braided line 4 intersects with the second main body segment 8 of its adjacent braided line 4.

[0056] In this embodiment, the braided thread 4 is a shape memory material.

[0057] like Figure 20 , Figure 21 as well as Figure 22 As shown, in specific usage scenarios, the occluder 18 of this embodiment has an original state, a transition state, and a stretched state. In this embodiment, when the occluder is in the original state, that is, when the occluder 18 is in a natural state without being subjected to any external force, the distance between the proximal end and the distal end of the first occluder 19 is the smallest, and the distance between the proximal end and the distal end of the second occluder 20 is the smallest. At this time, the first occluder 19 and the second occluder 20 are disc-shaped. When the occluder is in the occlusion usage state, according to the material properties of shape memory, the two occluder parts can be made to approach the disc-shaped tightened state of the original state as much as possible. The first occluder 19 and the second occluder 20 can better fit with the tissue to close the gap.

[0058] In this embodiment, when the plug is in the transition state, i.e., during the process of the plug 18 being retracted into the loader, the plug is stretched sequentially from the second plug portion 20 to the waist portion 22 and the first plug portion 19 due to radial pressure. At this time, the distance between the proximal and distal ends of the first plug portion 19 is increased, as is the distance between the proximal and distal ends of the second plug portion 20. The first plug portion 19 and the distal end 2201 of the waist portion are stretched to form a first expansion portion 24, and the second plug portion 20 and the proximal end 2202 of the waist portion are stretched to form a second expansion portion 24. Two expansion portions 25; In this embodiment, when the occluder is in a stretched state, that is, when the occluder 18 is fully retracted into the loader, the first expansion portion 24 and the second expansion portion 25 are radially stretched to their maximum state. At this time, the distance between the proximal end and the distal end of the first occluder 19 is at its maximum, and the distance between the proximal end and the distal end of the second occluder 20 is at its maximum. At this time, the maximum outer diameter of the first expansion portion 24 and the maximum outer diameter of the second expansion portion 25 are stretched to their minimum state, so that the volume of the occluder is reduced to be housed in the loader so that it can enter the body with the delivery tube during the operation.

[0059] It should be noted that, as Figure 8 , Figure 9 as well as Figure 10 As shown, the maximum outer diameter of the first sealing part is D1, the maximum outer diameter of the waist part is D2, and the maximum outer diameter of the second sealing part is D3.

[0060] In this embodiment, under different states, the maximum outer diameter D1 of the first sealing part 19 is greater than the maximum outer diameter D2 of the waist part 22. The size relationship between the maximum outer diameter D3 of the second sealing part 20 and the maximum outer diameter D2 of the waist part 22 is not limited. The size relationship between the maximum outer diameter D1 of the first sealing part 19 and the maximum outer diameter D3 of the second sealing part 20 is not limited, so as to adapt to gaps of various shapes and sizes that need to be sealed.

[0061] In one specific implementation, such as Figures 8 to 10 and Figure 11 As shown, in the original state, the maximum outer diameter D1 of the first sealing part 19 can be less than or equal to the maximum outer diameter D3 of the second sealing part 20, and the waist part 22 is cylindrical and its maximum outer diameter is significantly smaller than the maximum outer diameter of the two sealing parts.

[0062] In one specific implementation, such as Figures 12 to 15 As shown, the maximum outer diameter D1 of the first sealing part 19 can be greater than or equal to the maximum outer diameter D3 of the second sealing part 20. The waist part 22 is cylindrical or oblique cylindrical and its maximum outer diameter is smaller than the maximum outer diameter of the two sealing parts. However, the maximum outer diameter of its waist part 22 is significantly larger than the maximum outer diameter of the waist part of the unclosed orifice plugger in the above embodiment.

[0063] like Figure 14 , Figure 15 As shown, the first blocking part 19 of the occluder in this embodiment has an eccentric structure. At this time, the axes of the first blocking part 19 and the second blocking part 20 of the occluder 18 are not on the same straight line. Moreover, for the occluder 18, the axis of its waist 22 is inclined relative to the axis of the first blocking part 19 and the second blocking part 20.

[0064] In a specific embodiment, such as Figure 16 , Figure 17 As shown, the maximum outer diameter D3 of the second sealing part 20 of the plugger 18 is slightly smaller than the maximum outer diameter D2 of the waist part 22. At this time, a part of the fastener 21 at the constriction part 3 is recessed inward, that is, a part of the fastener 21 is embedded in the waist part 22.

[0065] In a specific embodiment, such as Figure 18 , Figure 19 As shown, the maximum outer diameter D1 of the first sealing part 19 is greater than the maximum outer diameter D3 of the second sealing part 20. The waist is cylindrical and its maximum outer diameter is smaller than the maximum outer diameter of the two sealing parts. The maximum outer diameter of the waist is significantly larger than the maximum outer diameter of the waist of the patent foramen ovale occluder in the above embodiment. The top two sides of the first sealing part 19 are set as rounded chamfered structures 23, which fits better with the defect after implantation and facilitates tissue growth and climbing.

[0066] In this embodiment, the proximal end is the end that is closer to the operator during use, and the distal end is the end that is farther away from the operator.

[0067] The occluder in this embodiment can be applied to scenarios requiring in vivo occlusion, such as patent foramen ovale, atrial septal defect, ventricular septal defect, and patent ductus arteriosus.

[0068] Another embodiment provides a method for manufacturing a occluder, such as Figure 6 , Figure 7 As shown, in order to more clearly understand the weaving method in this application, the above weaving method will be described in conjunction with the weaving device.

[0069] The weaving device used in this embodiment includes an inner weaving mechanism 11 located in the inner circle and an outer disc mechanism 9 located in the outer circle. The inner circle of the outer disc mechanism 9 is provided with several hook mechanisms 10 spaced apart, and the outer circle of the inner weaving mechanism 11 is provided with several grooves 12 spaced apart, with each groove 12 corresponding to a hook mechanism 10. A protruding cylinder 13 is located at the center of the inner weaving mechanism 11, and a sleeve 14 is fitted onto the cylinder 13. During the weaving process, the braided mesh tube will be gradually woven onto the sleeve 14. A metal gasket 15 is provided at the top of the sleeve 14, and several small holes are provided on the metal gasket 15. An auxiliary rod 17 is inserted into each small hole to assist in the pre-weaving positioning of the thread. A first ring 16 is provided on the metal gasket 15, and the auxiliary rod 17 abuts against the inner circle of the first ring 16. The inner diameter of the first ring 16 determines the opening diameter of the rivetless end of the plug 18. Therefore, the appropriate size of the first ring 16 can be selected according to the opening diameter of the rivetless end.

[0070] The specific weaving method in this embodiment is as follows:

[0071] Multiple braided threads 4 are folded in half sequentially and then threaded. The bent sections 5 of adjacent braided threads 4 overlap vertically. The bent sections 5 of multiple braided threads 4 are connected to form a continuous ring structure 101. After the first main body section 7 and the second main body section 8 of the braided threads 4 are rotated in the same direction at a fixed angle, the first main body section 7 and the second main body section 8 are then repeatedly braided.

[0072] In this embodiment, the braiding method involves braiding from the far end to the near end of the braided mesh tube. Multiple braided threads 4 are connected by overlapping at the bending section 5, making the far end 1 of the braided mesh tube a continuous ring structure 101. That is, the far end 1 of the braided mesh tube is self-closing, meaning that no additional components are needed for closing.

[0073] In this embodiment, the first end of the braided thread 4 is connected to the first counterweight, that is, the first counterweight is connected to the end of the first main body segment 7 of each braided thread 4 away from the bending segment 5. After folding, the second end of the braided thread 4 is connected to the second counterweight, that is, the second counterweight is connected to the end of the second main body segment 8 of each braided thread 4 away from the bending segment 5.

[0074] In the threading stage of this embodiment, the first end of the first braided thread 4 is first connected to the first counterweight, and then the second end of the first braided thread 4 is passed around the first ring 16 and connected to the second counterweight, so that the braided thread is always in a stretched state on the braiding device; subsequently, the first main body segment 7 and the second main body segment 8 of the first braided thread 4 fall into two adjacent grooves 12 respectively; the second end of the second braided thread 4 passes under the first main body segment 7 or the second main body segment 8 of the first braided thread 4, passes through the first ring 16, is folded in half, and then connected to the second counterweight; the first main body segment 7 and the second main body segment 8 of the second braided thread 4 fall into two consecutive grooves 12 adjacent to the first main body segment 7 and the second main body segment 8 of the first braided thread 4 respectively; the above steps are repeated to thread all the remaining braided threads 4 in sequence, and finally all the grooves 12 have a corresponding strand of thread. After the threading is completed, the bent segments 5 of adjacent braided threads 4 overlap vertically, and the bent segments 5 of multiple braided threads 4 overlap and connect in sequence to form a continuous ring structure 101.

[0075] Counterweights are placed at both ends of the braided wire 4 to keep the braided wire in a stable stretched state during the winding process, preventing disorderly changes in the position of the braided wire during winding and achieving a compact weaving effect, thus ensuring the density of the braided mesh and the final forming state of the braided tube.

[0076] In the weaving stage of this embodiment, after the first main body segment 7 and the second main body segment 8 of the weaving thread 4 are rotated at a fixed angle in the same direction, the first main body segment 7 and the second main body segment 8 are then reciprocated in the same direction and at the same angle. This includes rotating the first main body segment 7 of the weaving thread 4 at a fixed angle in a clockwise or counterclockwise direction at a first initial position and stopping at a first weaving position, and rotating the second main body segment 8 of the weaving thread 4 at a fixed angle in the same direction at a second initial position and stopping at a second weaving position.

[0077] Specifically, in this embodiment, after the braiding device is started, the hooking mechanism 10 extends and hooks a strand of thread in the corresponding groove 12. Because every other groove 12 on the outer ring of the internal braiding mechanism 11 corresponds to an inner ring hooking mechanism 10 of the outer disc mechanism 9, in the initial state of braiding, the hooking mechanism 10 corresponds to the first main body segment of each braiding thread. Then, the internal braiding mechanism 11 rotates clockwise or counterclockwise and passes through the position of one groove 12, stopping at the second groove 12 it reaches, and pushes the currently hooked strand of thread into the groove 12. At this time, it is pushed into the groove position where the first main body segment of the adjacent braiding thread was located in the initial state; the internal braiding mechanism 11 reverses... The device rotates to the position of the groove 12 adjacent to the starting groove. The hooking mechanism 10 corresponding to this groove extends and hooks the other strand of the previously corresponding braided thread 4. At this time, the hooking mechanism 10 corresponds to the second main body segment of each braided thread. The braiding mechanism rotates in the same direction as before and passes through the position of one groove 12 again. At the second groove position, this strand of thread is pushed into it. At this time, it is pushed into the groove position where the second main body segment of the adjacent braided thread was located in the initial state. Then, the internal braiding mechanism 11 rotates in the opposite direction again and passes through one groove to the position corresponding to the first main body segment of each braided thread again. This process is repeated layer by layer to finally form a braided mesh tube on the sleeve 14.

[0078] In this embodiment, the proximal end is the end that is closer to the operator during use, and the distal end is the end that is farther away from the operator.

[0079] The braided mesh tube in this embodiment is preferably made of 36 braided threads 4, which are folded in half to form a total of 72 strands. The braided threads 4 are shape memory materials, specifically nickel-titanium metal wires.

[0080] The braided mesh tube in this embodiment can preferably be made of 72 braided threads 4, which are folded in half to form a total of 144 strands. The braided threads 4 are shape memory materials, specifically nickel-titanium metal wires.

[0081] In this embodiment, there is no limit to the number of braided wires 4. The more braided wires 4 there are, the higher the mesh density of the braided mesh tube, and the better the flow blocking effect. Finally, the braided mesh tube is made into a plug 18 through conventional steps such as heat treatment and mold compression.

[0082] In summary, the occluder in this application has fasteners at only one end of the occlusion part, which greatly reduces the amount of metal implanted. After implantation into the heart, the flat surface is more conducive to tissue growth and endothelialization.

[0083] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.

Claims

1. An occluder, characterized by, The application relates to a woven mesh tube, comprising a distal end (1), a tube body (2) and a converging section (3); The distal end (1) is a continuous annular structure (101); The distal end (1) and the distal end part (201) of the tube body constitute a first occlusion part (19); The converging section (3) and the proximal end part (202) of the tube body constitute a second occlusion part (20); The remaining part (203) of the tube body constitutes a waist part (22) connecting the first occlusion part (19) and the second occlusion part (20); The converging section (3) is sleeved in a fastener (21).

2. The occluder according to claim 1, wherein the woven mesh tube is formed by a plurality of woven wires (4) being woven alternately in sequence, the woven wire (4) comprises a bending section (5) and a main body section (6), the bending sections (5) of two adjacent woven wires (4) are overlapped vertically, the distal end (1) is the continuous annular structure (101) formed by the bending sections (5) of the plurality of woven wires (4) being overlapped in sequence, and the tube body (2) is a mesh structure formed by the main body sections (6) of the plurality of woven wires (4).

3. The occluder according to claim 2, wherein the main body section (6) comprises a first main body section (7) and a second main body section (8), the first main body sections (7) of two adjacent woven wires (4) are parallel to each other, the second main body sections (8) of two adjacent woven wires (4) are parallel to each other, and the first main body section (7) of the woven wire (4) and the second main body section (8) of the adjacent woven wire (4) are crossed.

4. The occluder according to claim 3, wherein the occluder (18) has an original state, a transition state and a stretched state, the first occlusion part (19) and the second occlusion part (20) are disc-shaped in the original state, a first expansion part (24) is formed between the first occlusion part (19) and the distal end (2201) of the waist part in the transition state, a second expansion part (25) is formed between the second occlusion part (20) and the proximal end (2202) of the waist part, and the maximum outer diameters of the first expansion part (24) and the second expansion part (25) are stretched to the minimum in the stretched state.

5. The occluder according to claim 4, wherein the maximum outer diameter of the first occlusion part (19) is greater than the maximum outer diameter of the waist part (22).

6. The occluder according to claim 5, wherein the maximum outer diameter of the first occlusion part (19) is smaller than the maximum outer diameter of the second occlusion part (20), and the waist part is straight.

7. The occluder according to claim 5, wherein the maximum outer diameter of the first occlusion part (19) is greater than or equal to the maximum outer diameter of the second occlusion part (20), and the waist part (22) is straight or oblique.

8. The occluder according to claim 5, wherein ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ The maximum outer diameter of the second occlusion part (20) is less than or equal to the maximum outer diameter of the waist part (22).

9. The occluder according to any one of claims 1-8, characterized in that, The top two side edges of the first occlusion part (19) are provided with a circular arc type chamfer structure (23).

10. The occluder according to claim 9, characterized in that, The fastener (21) comprises a circular ring and a nut, and the nut is sleeved outside the circular ring.

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