Plugging device and plugging system

Abstract

The utility model relates to a plugging device and a plugging system, the plugging device comprises a body and a connecting piece connected with the body, the body is a metal wire mesh with a preset expansion shape, and the end part of a mesh wire bundle of the metal wire mesh is relatively fixed with the connecting piece; wherein the connecting piece comprises a bolt head and a sleeve arranged outside the bolt head in a sleeving mode at intervals, the end of the net wire bundle is installed in an annular gap between the bolt head and the sleeve in a penetrating mode, and welding heads enabling the end of the net wire bundle, the end of the sleeve and the peripheral side of the end of the bolt head to be relatively fixed are formed on the peripheral side of the end of the bolt head. A connecting structure used for being detachably connected with a conveying device is arranged on the inner wall of the bolt head, and the connecting structure does not extend to the tail end of the end of the bolt head, so that the bolt head comprises an empty connecting section which is located at the end and is not provided with the connecting structure and a connecting section which is located on the inner side of the empty connecting section and is provided with the connecting structure. The utility model aims to solve the problem that a conveying device cannot be connected with a plugging device due to deformation of a thread structure.

Description

Technical Field

[0001] This application relates to the field of medical device technology, and in particular to an occluder and occlusion system. Background Technology

[0002] Ventricular septal defect (VSD) and patent ductus arteriosus (PDA) are common congenital heart diseases in children. VSD occurs when the ventricular septum fails to develop properly during embryonic development, creating an abnormal communication and causing a left-to-right shunt at the ventricular level. The ductus arteriosus is the normal blood flow channel between the pulmonary artery and aorta during fetal development. After birth, the lungs expand and begin gas exchange, with pulmonary and systemic circulation each performing their respective functions. The ductus arteriosus usually closes within a few months due to disuse. If it remains open after one year of age, it is considered a patent ductus arteriosus. Clinically, VSD and PDA are often treated by placing an occluder at the defect site.

[0003] The occluder includes an occluder disc and an anchoring disc. At least one of the occluder disc and the anchoring disc is connected to a connector for connecting the delivery device and the connector during delivery of the occluder within a sheath. This facilitates delivery of the occluder within the delivery sheath. Existing occluder connector structures typically include an inner sleeve and an outer sleeve, which are sleeved together. The inner wall of the inner sleeve or outer sleeve is also threaded for threaded connection with the delivery device. There is a gap between the opposing side walls of the inner sleeve and the outer sleeve. The braided filaments at the end of the occluder disc or anchoring disc are gathered and converged in this gap. The gathered braided filaments are welded to the inner sleeve and the outer sleeve, and the delivery device is connected to the internal thread during delivery. However, the existing thread structure is flush with the welding head, while the inner and outer sleeves are generally small in size and thin in wall thickness. If the thread structure is flush with the welding head, burrs are likely to appear during the welding process, which can cause the thread to deform. At the same time, during the subsequent processing of the welding point, the end of the sleeve and the thread structure inside it will also be deformed due to extrusion and other reasons. This will prevent the original matching conveying device from entering the sleeve to achieve connection, and greatly reduce the product yield. Summary of the Invention

[0004] The purpose of this invention is to provide a plugging device and a plugging system, which aims to solve the problem that the conveying device cannot be connected to the plugging device due to deformation of the thread structure.

[0005] This utility model provides a sealing device, comprising: a body and a connector connected to the body. The body is a metal wire mesh with a preset extended shape, and the ends of the wire bundles of the metal wire mesh are fixed relative to the connector. The connector includes a plug and a sleeve spaced outside the plug. The ends of the wire bundles are inserted into the annular gap between the plug and the sleeve. Welding heads are formed on the outer periphery of the ends of the wire bundles, the sleeve, and the plug to fix them relative to each other. A connecting structure for detachable connection with a conveying device is provided on the inner wall of the plug. The connecting structure does not extend to the end of the plug, so that the plug includes an empty section at the end without the connecting structure and a connecting section with the connecting structure located inside the empty section.

[0006] In one embodiment, the end of the connecting segment away from the unconnected segment extends beyond the end of the sleeve away from the welding head.

[0007] In one embodiment, the distance by which the connecting segment extends beyond the end of the sleeve ranges from 0.2 mm to 0.6 mm.

[0008] In one embodiment, the axial length of the plug head is between 1.2 mm and 2.0 mm; and / or, the axial length of the unconnected section is between 0.2 mm and 0.4 mm; and / or, the axial height of the welding head is between 0.3 mm and 0.5 mm.

[0009] In one embodiment, the body includes a first sealing disc and a waist portion connected to the first sealing disc, and the connector includes a first connector, wherein the end of the wire bundle of the first sealing disc at the end away from the waist portion is fixed relative to the first connector.

[0010] In one embodiment, the first connector is recessed inward toward the side where the waist is located relative to the outermost disc surface of the first sealing disc, and the mesh bundle between the first connector and the outermost disc surface is transitionally connected.

[0011] In one embodiment, the body further includes a second sealing disc, which is axially spaced from the first sealing disc. The connector further includes a second connector, one end of the second sealing disc is connected to the waist, and the end of the wire bundle at the other end is fixed relative to the second connector.

[0012] In one embodiment, the distance between the two opposing surfaces of the first sealing disc and the second sealing disc does not exceed 5 mm.

[0013] In one embodiment, the diameter of the first sealing disc is larger than the diameter of the second sealing disc.

[0014] In one embodiment, the second occlusion disc includes a second inner disc surface and a second outer disc surface, as well as a second connecting surface connecting the second inner disc surface and the second outer disc surface. At least a portion of the outer peripheral profile of the second outer disc surface is inclined relative to the central axis of the occluder, and the distance of the inclined outer peripheral profile from the central axis gradually decreases along the axial direction from the first occlusion disc to the second occlusion disc.

[0015] In one embodiment, the waist includes a connected thick waist and a thin waist, the width of the thick waist is greater than the width of the thin waist, one end of the thick waist away from the thin waist is connected to the first sealing disc, one end of the thin waist away from the thick waist is connected to the second sealing disc, the thin waist is axially concave inward relative to the thick waist, and a portion of the surface of the second sealing disc surrounds the outer periphery of the thin waist and a portion of the thick waist.

[0016] In one embodiment, the narrow waist portion is provided with binding lines for securing the wire bundles of mesh on the narrow waist portion.

[0017] In one embodiment, the narrow waist includes a plurality of circumferentially arranged braided wires forming a ring. Within the ring, there are multiple through-paths passing through the center of the ring. The binding thread enters between two adjacent braided wires, extends along one of the through-paths, and then exits between two braided wires on the opposite side. After exiting, it wraps around the outer periphery of the narrow waist at a preset angle, then enters between two adjacent braided wires again, extends along another through-path, and then exits between two braided wires on the opposite side.

[0018] In one embodiment, the waist section is provided with at least one flow-blocking membrane.

[0019] This utility model also provides a sealing system, including a conveying device and the sealing device described above, wherein the conveying device and the sealing device are detachably connected.

[0020] The plugging device and plugging system of this application do not have a connecting structure on the inner wall of the unconnected section at the end of the plug head, but only on the inner wall of the connecting section located on the inner side. Therefore, during the welding process to form the weld head and / or the processing of the weld head (e.g., grinding), the connecting structure located on the inner side will not be affected. Even if the above process causes slight deformation of the structure of the unconnected section at the end of the plug head, for example, the edge of the unconnected section is squeezed and slightly deformed, the conveying device can still enter from the slightly deformed unconnected section and connect with the connecting structure on the inner wall of the connecting section. The conveying device will not fail to connect with the plugging device due to the inability to enter the plug head, which greatly improves product quality and reduces the defect rate. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of an exemplary plugging device of this utility model;

[0022] Figure 2 This is a schematic diagram of the structure of an exemplary occluder where the ends of the wire bundles are fixed relative to the connectors.

[0023] Figure 3 The schematic diagram of the occlusion device of this utility model includes an occlusion disc and a waist section; wherein, the thick lines in the figure indicate the structure of the first and second occlusion discs.

[0024] Figure 4 This is a schematic diagram of the structure of an exemplary occluder of the present invention, including a flow-blocking membrane and a binding wire;

[0025] Figure 5 This is a schematic diagram of the wiring structure of the binding wire of an exemplary occluder of this utility model; Detailed Implementation

[0026] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0027] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0028] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0029] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0030] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0031] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0032] This utility model provides an example of an occluder 100. The occluder 100 of this embodiment can be used to treat congenital heart diseases such as atrial septal defect, ventricular septal defect and patent ductus arteriosus. The common method is to place an occluder at the defect site to seal the defect.

[0033] See Figure 1 and Figure 2The sealing device 100 of this utility model includes a body 10 and a connector 20 connected to the body 10. The body 10 is a metal wire mesh with a preset extended shape, and the ends 10a of the wire bundles of the metal wire mesh are fixed relative to the connector 20. In this embodiment, the ends 10a of the wire bundles refer to the end section. The metal wire mesh of the body 10 achieves sealing and / or anchoring, and the connector 20 is used to gather and fix the ends 10a of the wire bundles of the metal wire mesh of the body 10. At the same time, the connector 20 can also be used to connect with a conveying device. In this embodiment, the body 10 can be woven from multiple nickel-titanium wires with super-elastic shape memory. After weaving, it can be heat-set to form a metal wire mesh with a preset extended shape. The extended shape of the body 10 can be shaped and set according to the actual sealing needs. It should be noted that the body 10 can deform under external force, causing the shape of the metal wire mesh with a preset extended shape to change. The body 10 in the preset extended shape described in this utility model is in its natural state, that is, the shape of the body 10 when it is not constrained by external force. The shape of the body 10 can change under external force. For example, it can be bound into a long strip and enter the sheath of the conveying device under force, and can unfold into the preset extended shape after being freed from the sheath. The body 10 can be entirely made of metal or polymer material; or it can be partially made of metal or polymer material.

[0034] For details, please refer to Figure 1 and Figure 2 The connector 20 includes a bolt head 22 and a sleeve 21 spaced out from the bolt head 22. The spaced-out sleeve arrangement creates an annular gap 201 between the bolt head 22 and the sleeve 21. The end 10a of the wire bundle passes through the annular gap 201 between the bolt head 22 and the sleeve 21. Welding heads 23 are formed on the outer periphery of the ends of the wire bundle, the sleeve 21, and the bolt head 22 to fix them relatively. The inner wall of the bolt head 22 is provided with a connecting structure 22a for detachable connection with the conveying device. The connecting structure 22a does not extend to the end of the bolt head 22. The end of the plug head 22 is a certain distance from the end of the plug head 22, such that the plug head 22 includes a loose section 221 located at the end without a connecting structure 22a, and a connecting section 222 located inside the loose section 221 with a connecting structure 22a. Specifically, the loose section 221 of the plug head 22 is located at the end, on the outer side axially, and is radially opposite to the welding head 23. The connecting section 222 of the plug head 22 is axially located inside the loose section 221. The connecting structure 22a is only provided on the inner wall of the connecting section 222 of the plug head 22, while the inner wall of the loose section 221 of the plug head 22 does not have a connecting structure 22a. When the conveying device is connected to the plug, it can enter from the loose section 221 at the end and extend continuously until it connects with the connecting structure 22a inside the connecting section 222. The connecting structure 22a can be an internal thread structure, but is not limited to this.

[0035] In this embodiment, no connecting structure is provided on the inner wall of the unconnected section 221 at the end of the plug head 22. The connecting structure is only provided on the inner wall of the connecting section 222 located on the inner side. Therefore, during the welding process to form the weld head and / or the processing of the weld head (e.g., grinding), the connecting structure located on the inner side will not be affected. Even if the above process causes slight deformation of the structure of the unconnected section 221 at the end, for example, the edge of the unconnected section 221 is squeezed and slightly deformed, the conveying device can still enter from the slightly deformed unconnected section 221 and connect with the connecting structure on the inner wall of the connecting section 222. The conveying device will not fail to connect with the plug due to the inability to enter the plug head, which greatly improves product quality and reduces the defect rate. In addition, in this embodiment, the sleeve is sleeved on the outside of the plug head, and the plug head with the connecting structure is placed on the inside, so that the usability of the connecting structure on the plug head is maximized, thereby greatly reducing the overall height of the connector. Compared to existing technologies, the overall height of the connector in this embodiment can be controlled to be less than 2mm, while in the existing connection method with the sleeve inside and the plug outside, the height of the connector must be more than 2.4mm to achieve a reliable connection.

[0036] See Figure 2 In one embodiment, the end of the connecting segment 222 furthest from the unconnected segment 221 extends beyond the end of the sleeve 21 furthest from the welding head, i.e., the connecting segment 222 extends out of the sleeve 21 on the same side. Specifically in Figure 2 In the illustrated embodiment, the inner end of the connecting segment 222 (i.e. Figure 2 The end of the connecting section 222 extends from the inner end of the sleeve 21. Preferably, the distance from the end of the connecting section 222 extending from the end of the sleeve 21 is between 0.2mm and 0.6mm, that is, the extension length L2 is between 0.2mm and 0.6mm. Here, "between" in this invention includes the values ​​at both ends, meaning the length L2 of the connecting section 222 extending from the end of the sleeve 21 can be 0.2mm or 0.6mm. In this embodiment, not only is the impact of energy on the internal thread structure of the plug head reduced during welding, preventing damage to the thread structure, but the thread structure also has sufficient number of turns, ensuring that the conveying device will not rotate and fall off during the conveying of the plug. While keeping the sleeve stationary, the plug head is moved upwards, and the original threaded through-hole structure is modified so that only the inner part is threaded, while the part near the outer side is unthreaded. The unthreaded structure of the plug head is flush with the welding head. The improved structure in this embodiment not only ensures the successful connection between the conveying device and the plug, but also ensures a stable connection of the conveying device without it falling off. Furthermore, the extension length L2 is between 0.2mm and 0.6mm, which not only achieves a stable connection, but also avoids the problem of excessive length causing the connected disc surface to bulge, and the protruding structure to press against the braided wire, thus preventing it from being shaped.

[0037] Continue reading Figure 2 Based on the above settings, the axial length L of the bolt head 22 in this embodiment can be between 1.2mm and 2.0mm, meaning the overall height of the connector 20 in this embodiment can be controlled to be 2mm or less. In other embodiments, the axial height H1 of the welding head 23 is between 0.3mm and 0.5mm, and / or the axial length L1 of the unconnected section 221 is between 0.2mm and 0.4mm. This height range of H1 of the welding head 23 ensures the connection strength between the wire bundle, the sleeve 21, and the bolt head 22. The axial length range of L1 of the unconnected section 221 allows for as many connection structures as possible to be provided within the bolt head 22 while avoiding impact on the connection structure, thereby ensuring the connection strength with the conveying device and preventing an increase in the overall height of the connector 20.

[0038] Continue reading Figure 2 Welding heads 23 are formed on the outer periphery of the ends of the wire bundle, the sleeve 21, and the plug 22 to fix them relatively. The welding heads 23 can be formed in various ways. For example, at the initial assembly stage, the ends of the wire bundle and the sleeve 21 are aligned with or extend beyond the end of the plug 22. Then, heating is applied to melt the ends of the wire bundle and the sleeve 21, forming a welding head on the outer periphery of the plug 22. Generally, the outer surface of the welding head formed at this stage is not smooth and can be further processed by grinding or other methods to achieve a smoother finish. Figure 2 The weld head 23 shown has a smooth surface. Another approach is to initially position the ends of the wire bundle and the sleeve 21 a certain distance from the end of the plug head 22, then heat the welding rod to form a weld head connecting all three elements on the outer periphery of the plug head 22. However, the outer surface of the weld head formed in this case may not be smooth and requires further grinding. This method can also produce a weld head with a smooth surface. Figure 3 The welding head 23 shown has a smooth surface. It should be understood that, since there is an annular gap 201 between the plug head 22 and the sleeve 21, the welding head can also enter the annular gap 2a in the hot-melt state.

[0039] See Figure 3This embodiment provides an exemplary occluder suitable for occlusion treatment of patent ductus arteriosus. The body 10 of the occluder 100 in this embodiment includes a first occlusion disc 11 and a waist portion 12 connected to the first occlusion disc 11. The connector 20 includes a first connector 20a. The end 10a of the wire bundle at the end of the first occlusion disc 11 away from the waist portion 12 is fixed relative to the first connector 20a. For example, the first sealing disc 11 includes a first outer disc surface 111 and a first inner disc surface 112, and a first connecting surface 113 connecting the first inner disc surface 112 and the first outer disc surface 111. The end 10a of the mesh bundle at the outer end of the first outer disc surface 111 is fixed relative to the first connector 20a. The mesh bundle at the inner end of the first outer disc surface 111 is connected to the first connecting surface 113. The mesh bundle at the outer end of the first inner disc surface 112 is connected to the first connecting surface 113, and the mesh bundle at the inner end is connected to the mesh bundle of the waist portion 12. The first connecting surface 113 is a curved surface that convexes outward relative to the central axis oo of the sealing device. Therefore, the maximum disc diameter of the first sealing disc 11 is determined by the maximum disc diameter D1 in the first connecting surface 113. The disc diameter D2 of the waist portion 12 is smaller than the disc diameter D1 of the first sealing disc 11.

[0040] In one embodiment, the wire bundle at the end of the waist section 12 furthest from the first inner disc surface 112 can be directly connected to and fixed to the connector 20. That is, in this embodiment, it is a single-disc structure, where sealing is achieved through the first sealing disc 11, and anchoring and sealing are achieved through the waist section 12. In other embodiments, the wire bundle at the end of the waist section 12 furthest from the first inner disc surface 112 can also be connected to other disc surfaces, for example, such as... Figure 3 As shown, the second sealing plate 13 is connected, that is, in this embodiment, as... Figure 3 It has a double-disc structure.

[0041] In the above description, regardless of whether it is a single-disc or double-disc structure, the way in which the end 10a of the wire bundle of the first sealing disc 11 is fixed relative to the connector 20, the way in which the end 10a of the wire bundle of the waist 12 is fixed relative to the connector 20, and the way in which the end 10a of the wire bundle of the second sealing disc 13 is fixed relative to the connector 20 can all refer to the way in which the end 10a of the wire bundle is fixed relative to the connector 20 in the aforementioned section, and will not be repeated here.

[0042] Continue reading Figure 3 In other embodiments, the first connector 20a is recessed inward relative to the outermost surface of the first sealing disc 11 facing the side with the waist portion 12. The mesh bundle between the first connector 20a and the outermost surface is transitionally connected. This transitional connection can be any connection method, for example, such as... Figure 3As shown, through a curved transition connection, the first outer disc surface 111 includes a centrally located curved concave disc surface and a flat disc surface surrounding the outer periphery of the curved concave disc surface. Preferably, the outer end face of the first connector 20a is substantially flush with the outermost disc surface of the first occlusion disc 11, making the outer disc surface of the first occlusion disc 11 substantially planar. This avoids excessive protrusion of the occluder into the aorta during patent ductus arteriosus treatment, thus preventing it from affecting blood flow velocity and reducing the risk of aortic stenosis.

[0043] Continue reading Figure 1 As described in the previous embodiment, the occluder 100 can also be a double-disc structure. The body 10 further includes a second occluder disc 13, which is axially spaced from the first occluder disc 11. The connector 20 further includes a second connector 20b. One end of the second occluder disc 13 is connected to the waist portion 12, and the end 10a of the mesh bundle at the other end is fixed relative to the second connector 20b. For example, the second occluder disc 13 includes a second inner disc surface 131 and a second outer disc surface 132, and a second connecting surface 133 connecting the second inner disc surface 131 and the second outer disc surface 132. The end 10a of the mesh bundle at one end of the second outer disc surface 132 is fixed relative to the second connector 20b, and the mesh bundle at the other end of the second outer disc surface 132 is connected to the second connecting surface 133. The mesh bundle at one end of the second inner disc surface 131 is connected to the second connecting surface 133, and the mesh bundle at the other end is connected to the mesh bundle of the waist portion 12. The diameter D2 of the waist section 12 is smaller than the maximum diameter D3 of the second sealing disc 11. Similarly, the way the end 10a of the wire bundle of the second sealing disc 12 is fixed relative to the second connector 20b is as described above, and will not be repeated here.

[0044] See Figure 3 The distance W between the two opposing discs of the second occlusion disc 13 and the first occlusion disc 11 does not exceed 5mm. This setting, on the one hand, increases the applicability of the occluder, making it applicable to more types of patent ductus arteriosus. On the other hand, for patients with shorter PDA length, it avoids the situation where it cannot be completely blocked, and avoids the occluder disc from protruding at the pulmonary artery position, causing pulmonary artery stenosis and hemolysis.

[0045] See Figure 3 The maximum diameter D1 of the first occluding disc 11 is greater than the maximum diameter D3 of the second occluding disc 13. This arrangement reduces the protrusion of the second occluding disc 13 into the pulmonary artery, affecting blood flow velocity and reducing the risk of hemolysis and pulmonary artery stenosis. Preferably, D1 is approximately 1 mm to 3 mm larger than D3.

[0046] See Figure 3At least a portion of the outer peripheral profile of the second outer disk surface 132 is inclined relative to the central axis oo of the occluder 100, and the inclined outer peripheral profile gradually decreases in distance from the central axis along the axial direction from the first occluder disk 11 to the second occluder disk 13. For example, as... Figure 3 As shown, the second sealing disc 13 has a double-layer structure, including a second inner disc surface 131 and a second outer disc surface 132. In this embodiment, the shapes and outlines of the second inner disc surface 131 and the second outer disc surface 132 are approximately the same, with the second inner disc surface 131 located inside the second outer disc surface 132. The entire second outer disc surface 132 can be inclined, and similarly, the entire second inner disc surface 131 can also be inclined. Alternatively, as... Figure 3 As shown, part of the second outer disk surface 132 is inclined, and another part is relatively flat. Similarly, part of the second inner disk surface 131 is inclined, and another part is also relatively flat. That is, the second sealing disk 13 presents the following characteristics: Figure 3 The boat shape shown, specifically, as... Figure 3 The second inner disc surface 131 includes an inclined inner disc surface 1311 and a connected straight inner disc surface 1312. The second outer disc surface 132 includes an inclined outer disc surface 1321 and a connected straight outer disc surface 1322. The inclined inner disc surface 1311 and the inclined outer disc surface 1321 are substantially parallel, and the straight inner disc surface 1312 and the straight outer disc surface 1322 are substantially parallel. Here, "substantially parallel" means that the deviation angle between them is less than 10°. It should also be noted that the aforementioned "straight" does not mean completely perpendicular to the central axis of the occluder. Due to certain errors during the manufacturing process, as long as they are within the error range, they fall within the scope of the "straight" described in this application. Specifically, a deviation of ±10° in a direction relative to the central axis of the occluder is within the error range. In this embodiment, the boat-shaped arrangement of the second occluder allows the disc surface structure to better conform to the tissue at the pulmonary artery end when the second occluder disc 13 is close to the pulmonary artery end. This enables better sealing of the defect, increases endothelial creep speed, and reduces the risk of residual shunt. Simultaneously, it effectively maintains radial support.

[0047] See Figure 3 In one embodiment, the waist portion 12 includes a connected thick waist portion 121 and a thin waist portion 122, which are connected by a third connecting surface 123. The waist width of the thick waist portion 121 is greater than that of the thin waist portion 122. The end of the thick waist portion 121 away from the thin waist portion 122 is connected to the first sealing disc 11, and the end of the thin waist portion 122 away from the thick waist portion 121 is connected to the second sealing disc 13. In one embodiment, the waist width of the thick waist portion 121 gradually decreases from the first sealing disc 11 to the second sealing disc 13 in the axial direction. In this manner, the connection point between the thick waist portion 121 and the first sealing disc 11 represents the maximum waist width of the waist portion 12, which is the maximum disc diameter D2 of the waist portion 12.

[0048] In one embodiment, such as Figure 4 As shown, the narrow waist 122 is concave inward relative to the wide waist 121, and a portion of the second occlusion disc 13 surrounds the outer periphery of the narrow waist 122 and a portion of the wide waist 121. That is, the narrow waist 122 and a portion of the wide waist 121 connected to it are housed within a cavity formed by the inclined inner disc surface 1311. In this embodiment, the concave design allows the waist to extend, providing a stretchable structure that can be adjusted for arterial catheter structures of different heights when the occluder is implanted. The smaller end of the wide waist 121 of the occluder is close to the second occlusion disc and connected to the narrow waist structure, while the larger end is close to the first occlusion disc. The proximity of the smaller end to the second occlusion disc increases occlusion stability and prevents displacement and dislodgement of the occluder. The occluder of this embodiment is applicable to various PDAs, overcoming the limitation of similar products that cannot effectively occlude slender PDAs. Furthermore, the narrow waist portion 122 is housed within a portion of the second occluder disc surface, which facilitates the occluder disc surface to conform to the heart tissue, minimizes damage to vascular tissue, and also helps to block blood flow and prevent residual shunting from seeping out at the edge of the disc surface.

[0049] like Figure 4 As shown, the occluder 100 includes a first occlusion disc 11 and a second occlusion disc 13. The connector 20 includes a first connector 20a and a second connector 20b. The end 10a of the mesh bundle at the end of the first occlusion disc 11 away from the waist 12 is fixed relative to the first connector 20a. The end 10a of the mesh bundle at the end of the second occlusion disc 13 away from the waist 12 is fixed relative to the second connector 20b. Both the first connector 20a and the second connector 20b have through holes penetrating their respective axial end faces. The inner wall of the through hole is provided with a connecting structure 22a. This configuration allows the occluder to perform occlusion via both venous and arterial pathways.

[0050] See Figure 4At least one layer of flow-blocking membrane 40 is provided within the waist portion 12. In other embodiments, multiple layers of flow-blocking membrane 40 can be provided, and these multiple layers can be spaced apart or combined together. When the waist portion 12 includes a wide waist portion 121 and a narrow waist portion 122, the flow-blocking membrane 40 can be provided within the wide waist portion 121, within the narrow waist portion 122, or simultaneously within both. In other embodiments, the flow-blocking membrane 40 can also be provided within the first sealing plate 11 and / or the second sealing plate 13. Exemplarily, the flow-blocking membrane 40 can be a polyester film and / or a polytetrafluoroethylene film, but it is not limited to these; any membrane capable of forming a blocking function can be used as the flow-blocking membrane 40 in this embodiment. As a method of fixing the flow-blocking membrane 40, the edge of the flow-blocking membrane 40 can be sewn and fixed to the mesh bundle at the edge of the sealing device 100.

[0051] Continue reading Figure 5 In other embodiments, the narrow waist 122 is provided with binding wires 30 for binding the wire bundles of the narrow waist 122.

[0052] As one way to set up the binding wire 30, combined with Figure 5 and Figure 5 The narrow waist 122 includes a plurality of circumferentially arranged braided wires 101, which are arranged in a ring. There are multiple passing paths through the center O of the ring. The binding wire 30 enters between two adjacent braided wires 101 and extends along one of the passing paths before exiting between two braided wires 101 on the opposite side. After exiting, it wraps around the outer periphery of the narrow waist 122 at a preset angle, then enters between two adjacent braided wires 101 again and extends along a passing path before exiting between two braided wires 101 on the opposite side.

[0053] For example, refer to Figure 5 As shown, the wiring method of the binding wire 30 is as follows: First, as... Figure 5 As shown in step 1, start the needle at point A in the diagram, inserting it between two adjacent braided threads 101 at point A. Pass the needle through the narrow waist 122 along one of the passing paths to the two braided threads 101 at point B on the opposite side. Then, follow the arrow in the diagram to move approximately 90° clockwise to point C. From point C, pass the needle through the waist again along one of the passing paths to the two braided threads 101 at point D. Again, follow the arrow in the diagram to move 90° clockwise to point B, and pass the needle through the narrow waist 122 along one of the passing paths to point A. Again, follow the arrow in the diagram to move 90° clockwise, inserting the needle at point D, passing the needle through the waist to the two adjacent braided threads 101 at point C, and then passing the needle clockwise from point A through the narrow waist 122 to point B. The desired effect is as shown in the diagram. ​As shown in step 2, after completing step 2, as shown in step 3, wrap the thread clockwise one and a half times from point B to point A and then tie a knot. The knot should be small and not loose. Then pull the end of the thread over the other end of the waist, as in step 4, so that the knot is not exposed inside the waist, and cut off the excess thread (leaving about 1mm of thread). Using this method, it can be ensured that the nickel-titanium wire at the narrow waist will not unravel during release, ensuring that the suture constraint position remains unchanged. The constraint position of the binding line will not change due to the entry and exit of the occluder's sheath, ensuring the stability of the occluder's entry and exit sheath, and also achieving the sealing function. It should be noted that, for clarity, therefore... ​ The diagram shows the spacing between the binding lines. It should be understood that during the actual binding process, each loop of binding line is tightly connected.

[0054] This utility model also provides an exemplary sealing system, including a conveying device and the sealing device 100 described above, wherein the conveying device and the connecting member 20 of the sealing device 100 are detachably connected.

[0055] The plugging device and plugging system of this application do not have a connecting structure on the inner wall of the unconnected section at the end of the plug head, but only on the inner wall of the connecting section located on the inner side. Therefore, during the welding process to form the weld head and / or the processing of the weld head (e.g., grinding), the connecting structure located on the inner side will not be affected. Even if the above process causes slight deformation of the structure of the unconnected section at the end of the plug head, for example, the edge of the unconnected section is squeezed and slightly deformed, the conveying device can still enter from the slightly deformed unconnected section and connect with the connecting structure on the inner wall of the connecting section. The conveying device will not fail to connect with the plugging device due to the inability to enter the plug head, which greatly improves product quality and reduces the defect rate.

[0056] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0057] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. An occluder, characterized by, The occluder comprises a body and a connecting member connected with the body, the body is a wire mesh with a preset expanded shape, the ends of the wire bundles of the wire mesh are fixedly connected with the connecting member; wherein the connecting member comprises a bolt head and a sleeve pipe sleeved outside the bolt head, the ends of the wire bundles are arranged in the annular gap between the bolt head and the sleeve pipe, and the end of the wire bundle, the end of the sleeve pipe and the end of the bolt head are fixedly connected by a welding head, the inner wall of the bolt head is provided with a connecting structure for detachable connection with a conveying device, the connecting structure does not extend to the end of the bolt head, so that the bolt head comprises an empty connection section at the end and not provided with the connecting structure, and a connecting section provided with the connecting structure inside the empty connection section.

2. The occluder of claim 1, wherein, The end of the connecting section away from the empty connection section extends out of the end of the sleeve pipe away from the welding head.

3. The occluder of claim 2, wherein, The distance of the connecting section extending out of the end of the sleeve pipe ranges from 0.2mm to 0.6mm.

4. The occluder of claim 1, wherein, The axial length of the bolt head ranges from 1.2mm to 2.0mm; and / or, the axial length of the empty connection section ranges from 0.2mm to 0.4mm; and / or, the axial height of the welding head ranges from 0.3mm to 0.5mm.

5. The occluder according to any one of claims 1 to 4, characterized in that The body comprises a first occlusion disc and a waist connected with the first occlusion disc, the connecting member comprises a first connecting member, and the ends of the wire bundles of the end of the first occlusion disc away from the waist are fixedly connected with the first connecting member.

6. The occluder of claim 5, wherein, The first connecting member is recessed towards the side provided with the waist relative to the outermost disc surface of the first occlusion disc, and the wire bundles between the first connecting member and the outermost disc surface are transitionally connected.

7. The occluder of claim 5, wherein, The body further comprises a second occlusion disc, the second occlusion disc is arranged axially spaced from the first occlusion disc, and the connecting member further comprises a second connecting member, one end of the second occlusion disc is connected with the waist, and the ends of the wire bundles of the other end are fixedly connected with the second connecting member.

8. The occluder of claim 7, wherein, The distance between the two opposite disc surfaces of the first occlusion disc and the second occlusion disc is not more than 5mm.

9. The occluder of claim 7, wherein, The disc diameter of the first occlusion disc is larger than the disc diameter of the second occlusion disc.

10. The occluder of claim 7, wherein, The second occlusion disc comprises a second inner disc surface and a second outer disc surface, and a second connecting surface connecting the second inner disc surface and the second outer disc surface, at least part of the outer peripheral contour of the second outer disc surface is inclined relative to the central axis of the occluder, and the distance from the central axis gradually decreases in the direction from the first occlusion disc to the second occlusion disc along the axial direction.

11. The occluder of claim 7, wherein, The waist comprises a thick waist and a thin waist connected with each other, the waist width of the thick waist is larger than the waist width of the thin waist, one end of the thick waist away from the thin waist is connected with the first occlusion disc, one end of the thin waist away from the thick waist is connected with the second occlusion disc, the thin waist is recessed axially towards the thick waist relative to the thick waist, and part of the disc surface of the second occlusion disc surrounds the outer peripheral side of the thin waist and part of the thick waist.

12. The occluder of claim 11, wherein, The thin waist is provided with a binding wire for binding the wire bundles of the thin waist.

13. The occluder of claim 12, wherein, The narrow waist portion comprises a plurality of braided filaments circumferentially arranged to form a ring, a plurality of crossing paths passing through the center of the ring are present inside the ring, the binding wire is inserted between two adjacent braided filaments and extends along one of the crossing paths, and then is inserted between two opposite braided filaments, and after winding around the outer periphery of the narrow waist portion by a predetermined angle, the binding wire is inserted between two adjacent braided filaments again and extends along one of the crossing paths, and then is inserted between two opposite braided filaments.

14. The occluder of claim 5, wherein, At least one flow blocking film is arranged in the waist portion.

15. A closure system comprising a delivery device, and further comprising the closure device according to any one of claims 1 to 14, the delivery device being detachably connected with the connecting member of the closure device.

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