occluder

Abstract

This application relates to an occluder comprising a support and a flow-blocking membrane. The support includes a disc body composed of double-layered discs. The flow-blocking membrane is placed between the double-layered discs of the disc body. The outer peripheral edge of the flow-blocking membrane is connected to the disc body via a connecting line. The flow-blocking membrane located radially inward of the outer peripheral edge is limited to the disc body by a limiting member. The limiting member acts on or surrounds the central region of the flow-blocking membrane, so that the interior of the flow-blocking membrane remains taut. In the above solution, the limiting member connects other positions of the flow-blocking membrane to the disc body, and the flow-blocking membrane remains in contact with the inner wall of the upper disc surface. This allows the flow-blocking membrane and the disc body to deform synchronously when the occluder is withdrawn and withdrawn from the sheath. During the deformation process, the flow-blocking membrane and the disc body remain in contact, thereby preventing the flow-blocking membrane from shifting or wrinkling during withdrawal and withdrawal. It also ensures that the flow-blocking membrane is subjected to uniform force during withdrawal, withdrawal, and implantation in the human body, forming a stable flow-blocking effect.

Description

Technical Field

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

[0002] The foramen ovale is an essential blood supply channel for fetal survival. After birth, as the pressure in the right atrium decreases and the pressure in the left atrium increases, the foramen ovale usually closes within one year. If the foramen ovale remains open after the age of 3, a crescent-shaped scar remains at the top of the fossa ovale, known as patent foramen ovale (PFO). PFO is one of the most common congenital heart diseases, with an incidence of approximately 25% in the population. Treatment for PFO patients mainly includes oral antithrombotic drugs, implantation of a PFO occluder, and surgical repair. Currently, the most commonly used PFO occluders both domestically and internationally are dual-disc occluders. These dual discs are heat-formed using a metal memory material mesh, with stainless steel rivets securing the two discs on both sides. The mesh interlayer contains a membrane of flow-blocking material.

[0003] There are three main methods of flow clogging in existing PFO plugs: ① The flow-clogging membrane is wrapped with metal mesh on both sides, and then fixed to the metal mesh by edge stitching. A double-disc structure is then placed on both sides of the orifice to create a flow clogging effect. The disadvantage is that the stitching method between the flow-clogging membrane edge and the metal mesh usually results in wrinkles, or the membrane may undergo irreversible displacement during use; ② The plug uses a double-disc structure, but the two discs (or one disc) do not use a metal mesh structure, instead employing an open or closed design. The disadvantages of the ring metal support structure are: the flow-blocking membrane is external, and during insertion and exit of the sheath, the membrane is squeezed and moved in the sheath tube, which can easily cause the membrane to break and fall off, reducing the flow-blocking effect. In addition, for the metal mesh disk structure, when the flow-blocking membrane and the metal mesh are inserted into the sheath, they cannot be inserted into the sheath evenly, and the membrane will bulge due to compression, which will increase the insertion and exit forces. ③ The oval foramen is closed by needle and thread puncture and suturing. The disadvantage is that the flow-blocking effect is still lacking due to the limitations of the puncture precision and the number of times the thread can be inserted. Summary of the Invention

[0004] Therefore, it is necessary to provide a blocking device that aims to solve at least one technical problem existing in the prior art.

[0005] This application provides a clogging device, including a support and a flow-blocking membrane. The support includes a disc body composed of double-layered discs. The flow-blocking membrane is placed between the double-layered discs of the disc body. The outer peripheral edge of the flow-blocking membrane is connected to the disc body via a connecting line. The flow-blocking membrane located radially inward of the outer peripheral edge is limited to the disc body by a limiting member. The limiting member acts on or surrounds the central region of the flow-blocking membrane, so that the interior of the flow-blocking membrane remains taut.

[0006] In the above scheme, after connecting the outer peripheral edge of the flow-blocking membrane to the edge of the upper disk surface through connecting lines, other positions of the flow-blocking membrane are connected to the disk body through limiting components. This keeps the flow-blocking membrane in a taut state and ensures that the flow-blocking membrane adheres to the inner wall of the upper disk surface. As a result, when the occluder is withdrawn and inserted, the flow-blocking membrane and the disk body deform synchronously. During the deformation process, the flow-blocking membrane and the disk body remain in a close fit, thereby preventing the flow-blocking membrane from shifting or wrinkling during withdrawal and insertion. It also ensures that the flow-blocking membrane is subjected to uniform force during withdrawal, insertion, and implantation in the human body, forming a stable flow-blocking effect.

[0007] In one embodiment, a top tip is provided at the center of one of the outer surfaces of the double-layered disc body, and a sealing member is fitted around the outer periphery of the top tip.

[0008] In one embodiment, the limiting member includes a first limiting member located at the center of the flow-blocking film and extending through the top end, the first limiting member connecting the center of the flow-blocking film to the top end of the disk body, so that the flow-blocking film and the disk body remain in contact.

[0009] In one embodiment, the first limiting member is a suture line, one end of which is fixedly connected to the center of the flow-blocking membrane, and the other end passes through the center of the disc body and is knotted and fixed on the outside of the disc body.

[0010] In one embodiment, the limiting member includes a second limiting member, which has an annular structure and is disposed around the top end. The second limiting member connects the flow-blocking membrane to the disk body, so that the flow-blocking membrane and the disk body remain in contact.

[0011] In one embodiment, the second limiting member is a suture line, which runs continuously around the top end to connect the flow-blocking membrane to the disc body.

[0012] In one embodiment, the limiting member includes a third limiting member, which is arranged radially along the flow-blocking membrane, and a plurality of the third limiting members are spaced apart. The third limiting member connects the flow-blocking membrane to the disk body, so that the flow-blocking membrane and the disk body remain in contact.

[0013] In one embodiment, the third limiting member is a suture line, the third limiting member is continuously routed radially along the flow-blocking membrane, and the third limiting member is located radially between the outer peripheral edge of the flow-blocking membrane and the top end.

[0014] In one embodiment, there are two discs, namely a first disc and a second disc. The support also includes a waist structure connected between the first disc and the second disc. The limiting member includes a fourth limiting member located inside the waist structure. The fourth limiting member abuts against the center of the flow-blocking membrane, so that the flow-blocking membrane tends to adhere to the disc.

[0015] In one embodiment, the fourth limiting member includes a pusher and an elastic member. One end of the elastic member is connected to the waist structure, and the other end is connected to the pusher. The elastic member has the tendency to drive the pusher toward the flow-blocking membrane so that the flow-blocking membrane adheres to the upper plate surface.

[0016] In one embodiment, the fourth limiting member further includes a fixing plate and a fixing tube, the fixing plate being connected to the interior of the fixing tube, the fixing tube being connected to the waist structure, one end of the elastic member being fixedly connected to the fixing plate, and the other end being connected to the push head.

[0017] In one embodiment, the elastic element includes a spring and an elastic cord, the spring and the elastic cord having opposite elastic directions, the spring having a tendency to move the push head toward the flow-blocking membrane, and the elastic coefficient of the spring being greater than that of the elastic cord.

[0018] In one embodiment, the fourth limiting member includes two sets of connected push heads and elastic members, with the two push heads arranged back to back and facing the first disc and the second disc respectively. Attached Figure Description

[0019] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute an improper limitation of this application.

[0020] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0021] Figure 1This is a schematic diagram of the occluder shown in Embodiment 1 of this application;

[0022] Figure 2 yes Figure 1 Enlarged view of point A in the middle;

[0023] Figure 3 yes Figure 1 Enlarged view of point B in the middle;

[0024] Figure 4 yes Figure 1 Enlarged view of point C in the middle;

[0025] Figure 5 yes Figure 1 Schematic diagram of the right side view of the central plugging device;

[0026] Figure 6 This is a schematic diagram of the plugging device shown in Embodiment 2 of this application;

[0027] Figure 7 yes Figure 6 Enlarged view of point D;

[0028] Figure 8 yes Figure 6 Schematic diagram of the right side view of the central plugging device;

[0029] Figure 9 This is a schematic diagram of the plugging device shown in Embodiment 3 of this application;

[0030] Figure 10 yes Figure 9 Schematic diagram of the right side view of the central plugging device;

[0031] Figure 11 This is a schematic diagram of the plugging device shown in Embodiment 4 of this application;

[0032] Figure 12 yes Figure 11 Enlarged view of point E in the middle;

[0033] Figure 13 yes Figure 11 Schematic diagram of the right side view of the central plug.

[0034] Explanation of reference numerals in the attached figures:

[0035] 100. Plugging device; 110. Support; 111. Disc body; 1111. First disc body; 1112. Second disc body; 112. Waist structure; 113. Plugging component; 1131. Plugging head; 1132. End cap; 114. Top; 1141. First top; 1142. Second top; 120. Flow-blocking membrane; 130. Connecting wire; 140. Limiting component; 141. First limiting component; 142. Second limiting component; 143. Third limiting component; 144. Fourth limiting component; 1441. Push head; 1442. Elastic component; 14421. Spring; 14422. Elastic rope; 1443. Fixing disc; 1444. Fixing tube. Detailed Implementation

[0036] 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.

[0037] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0038] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0039] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, 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.

[0040] Furthermore, the terms "first" and "second" are used 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 as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0041] 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 according to the specific circumstances.

[0042] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through 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. "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.

[0043] It should be noted that when a component is described as "fixed to" or "set on" another component, it can be directly on the other component or there may be an intervening component. When a component is described as "connected to" another component, it can be directly connected to the other component or there may be an intervening component.

[0044] The preferred embodiments of this application will now be described with reference to the accompanying drawings.

[0045] like Figures 1 to 5 As shown in the illustration, an occluder 100 according to Embodiment 1 of this application includes a support 110 and a flow-blocking membrane 120. The support 110 includes a disc 111, which is composed of a double-layered disc surface made of woven metal mesh. The space between the double-layered disc surfaces of the disc 111 is hollow. The flow-blocking membrane 120 is placed between the double-layered disc surfaces of the disc 111 to block blood flow. Figure 1As shown, there are two disc bodies 111. For ease of explanation, the two disc bodies 111 are named the first disc body 1111 and the second disc body 1112, respectively. In this specification, unless otherwise specified, disc body 111 can refer to either the first disc body 1111 or the second disc body 1112. The support 110 also includes a waist structure 112 (e.g., ...) connecting the first disc body 1111 and the second disc body 1112. Figure 11 As shown), it is used to connect the second disc 1112 and the first disc 1111, and to seal the oval orifice.

[0046] like Figure 1 As shown, a top end 114 protrudes from the center of one side surface of the disc body 111, and a sealing member 113 is fitted around the outer periphery of the top end 114. Specifically, the top end 114 includes a first top end 1141 and a second top end 1142. The first top end 1141 is provided on the surface of the first disc body 1111 facing away from the second disc body 1112, and a sealing head 1132 is fitted around the outer periphery of the first top end 1141 to prevent the first disc body 1111 from loosening, thereby preventing damage to the sealing device 100. During the process of implanting the sealing device 100 into the human body and transporting it to the target location, it needs to be transported by a transport system, such as... Figure 1 As shown, a second top end 1142 is provided on the surface of the second disc body 1112 opposite to the first disc body 1111, and a bolt head 1131 for connecting the conveying system is sleeved on the outer periphery of the second top end 1142.

[0047] like Figures 1 to 3 , Figure 5 As shown, the outer peripheral edge of the flow-blocking membrane 120 is connected to the disk edge of the disk body 111 via a connecting line 130, as... Figures 1 to 3 As shown, the flow-blocking membrane 120 located inside the first disc 1111 is fixed to the edge of the first disc 1111 by the connecting line 130, and the flow-blocking membrane 120 located inside the second disc 1112 is fixed to the edge of the second disc 1112 by the connecting line 130. This ensures that during the sheathing (removing from the sheath of the delivery system) and sheathing (entering the sheath of the delivery system) processes of the plug 100, when the disc 111 deforms, the relative position of the outer peripheral edge of the flow-blocking membrane 120 and the disc edge of the disc 111 is fixed, thereby preventing the outer peripheral edge of the flow-blocking membrane 120 from shifting relative to the disc 111.

[0048] like Figure 1 As shown, the flow-blocking membrane 120 located radially inside the outer periphery is limited to the disk body 111 by the limiting member 140, so that the inside of the flow-blocking membrane 120 is kept in a taut state. It can be understood that the flow-blocking membrane 120 is located inside the disk body 111, and the structure of the flow-blocking membrane 120 is adapted to the internal structure of the disk body 111. When the flow-blocking membrane 120 is taut inside the disk body 111, the flow-blocking membrane 120 and the inner wall of the disk body 111 are basically in contact.

[0049] It should be noted that in the accompanying drawings of this specification, the connecting line 130 and part of the limiting member 140 are thickened to highlight their structure and position. However, the drawings only show the structure and position of the connecting line 130 and the limiting member 140 and do not limit their dimensional characteristics in actual applications.

[0050] In such Figure 1 and Figure 4 In the embodiment shown, the limiting member 140 includes a first limiting member 141, which is located at the center of the flow-blocking membrane 120 and extends through the top end 114. The first limiting member 141 connects the center of the flow-blocking membrane 120 with the top end 114 at the center of the disc body 111, so that the flow-blocking membrane 120 and the disc body 111 remain in contact.

[0051] like Figure 4 As shown, specifically in this embodiment, the first limiting member 141 is a suture. One end of the first limiting member 141 is fixedly connected to the center of the flow-blocking membrane 120, and the other end passes through the top end 114 at the center of the disc body 111 and is knotted and fixed on the outside of the disc body 111. In other embodiments, other structures can also be used for limiting, such as one end connected to the disc body 111 and the other end having a hook to hook the center of the flow-blocking membrane 120.

[0052] like Figure 1 and Figure 5 As shown, after connecting the outer peripheral edge of the flow-blocking membrane 120 to the edge of the upper disk surface via the connecting line 130, the center of the flow-blocking membrane 120 is connected to the top 114 of the center of the disk body 111 via the first limiting member 141. At this time, the center and outer peripheral edge of the flow-blocking membrane 120 are in a taut state, and the flow-blocking membrane 120 remains in contact with the inner wall of the upper disk surface. When both the center and outer peripheral edge of the flow-blocking membrane 120 are connected to the disk body 111, the flow-blocking membrane 120 and the disk body 111 deform synchronously when the occluder 100 is withdrawn and withdrawn from the sheath. During the deformation process, the flow-blocking membrane 120 and the disk body 111 remain in contact, thereby preventing the flow-blocking membrane 120 from shifting or wrinkling during withdrawal and withdrawal. It also ensures that the flow-blocking membrane 120 is subjected to uniform force after withdrawal, withdrawal, and implantation into the human body, forming a stable flow-blocking effect.

[0053] like Figures 6 to 8 As shown, this application illustrates a occluder 100 according to Embodiment 2. The difference between this occluder 100 and the occluder 100 shown in Embodiment 1 is that the limiting member 140 includes a second limiting member 142. The second limiting member 142 has an annular structure and is arranged around the top end 114. The second limiting member 142 connects the flow-blocking membrane 120 to the disc body 111, so that the flow-blocking membrane 120 and the disc body 111 remain in contact.

[0054] like Figure 7 and Figure 8 As shown, specifically in this embodiment, the second limiting member 142 is a suture line. The second limiting member 142 is continuously routed around the top end 114 to connect the flow-blocking membrane 120 and the disc body 111, so that the flow-blocking membrane 120 at the position corresponding to the edge of the top end 114 of the disc body 111 remains in a close fit with the disc body 111.

[0055] like Figures 6 to 8 As shown, in Embodiment 2, after connecting the outer peripheral edge of the flow-blocking membrane 120 to the edge of the upper disk surface via the connecting line 130, the flow-blocking membrane 120 is connected to the disk body 111 via the second limiting member 142 around the top 114, so that the flow-blocking membrane 120 at the position corresponding to the edge of the top 114 of the disk body 111 remains in a close fit with the disk body 111. At this time, the flow-blocking membrane 120 is in a taut state and remains in a close fit with the disk body 111, thereby preventing the flow-blocking membrane 120 from shifting or wrinkling during the sheathing and insertion process, and also ensuring that the flow-blocking membrane 120 is subjected to uniform force after sheathing, insertion and implantation in the human body, forming a stable flow-blocking effect.

[0056] like Figures 9 to 10 As shown, this is a occluder 100 according to Embodiment 3 of this application. The difference between this occluder 100 and the one shown in Embodiment 1 is that the limiting member 140 includes a third limiting member 143. The third limiting member 143 is arranged radially along the flow-blocking membrane 120, and multiple third limiting members 143 are spaced apart. The third limiting member 143 connects the flow-blocking membrane 120 to the disc body 111, ensuring that the flow-blocking membrane 120 and the disc body 111 remain in contact. In this embodiment, as... Figure 10 As shown, there are six third limiting members 143, which are spaced apart and arranged in a circumferential array. These third limiting members 143 connect the flow-blocking membrane 120 to the disk body 111 at different positions, thereby increasing the area between the flow-blocking membrane 120 and the disk body 111 in a relatively fixed position, and reducing the possibility of the flow-blocking membrane 120 moving relative to the disk body 111. In other embodiments, the number of third limiting members 143 can be other numbers; preferably, the multiple limiting members 143 are arranged in a circumferential array.

[0057] In this embodiment, the third limiting member 143 is a suture line. The third limiting member 143 runs continuously along the radial direction of the flow-blocking membrane 120, and is located radially between the outer peripheral edge of the flow-blocking membrane 120 and the top end 114 of the disk body 111. It is understood that the fact that the third limiting member 143 runs along the radial direction of the flow-blocking membrane 120 does not mean that the suture line is straight; it can be as follows: Figure 10 As shown, the winding is performed in accordance with the actual connection requirements of the flow-blocking membrane 120 and the disk 111.

[0058] like Figures 9 to 10As shown, in Embodiment 3, after connecting the outer peripheral edge of the flow-blocking membrane 120 to the edge of the upper disk surface via the connecting line 130, the flow-blocking membrane 120 is connected to the disk body 111 in the radial direction via multiple third limiting members 143. This ensures that the flow-blocking membrane 120 and the disk body 111 are fixed in the radial direction between the outer peripheral edge of the flow-blocking membrane 120 and the top 114 of the disk body 111. At this time, the flow-blocking membrane 120 is in a taut state and adheres to the disk body 111, thereby preventing the flow-blocking membrane 120 from shifting or wrinkling during the sheathing and insertion process. It also ensures that the flow-blocking membrane 120 is subjected to uniform force after sheathing, insertion, and implantation into the human body, forming a stable flow-blocking effect.

[0059] like Figures 11 to 13 As shown, this is a occluder 100 according to Embodiment 4 of this application. The difference between this occluder 100 and the occluder 100 shown in Embodiment 1 is that the limiting member 140 includes a fourth limiting member 144, as shown below. Figure 12 As shown, the fourth limiting member 144 is located inside the waist structure 112. The fourth limiting member 144 abuts against the center of the flow-blocking membrane 120, causing the flow-blocking membrane 120 to tend to adhere to the disk body 111. By pushing the flow-blocking membrane 120 through the fourth limiting member 144, the flow-blocking membrane 120 tends to adhere to the disk body 111, thereby keeping the center of the flow-blocking membrane 120 in contact with the disk body 111. At this time, the center and outer peripheral edge of the flow-blocking membrane 120 are in a taut state, and the flow-blocking membrane 120 adheres to the inner wall of the upper disk surface. When the center and outer periphery of the flow-blocking membrane 120 are connected to the disc body 111, the flow-blocking membrane 120 and the disc body 111 deform synchronously when the occluder 100 is withdrawn from and inserted into the sheath. During the deformation process, the flow-blocking membrane 120 and the disc body 111 remain in a close fit, thereby preventing the flow-blocking membrane 120 from shifting or wrinkling during withdrawal and insertion. It also ensures that the flow-blocking membrane 120 is subjected to uniform force during withdrawal, insertion, and implantation into the human body, thus forming a stable flow-blocking effect.

[0060] like Figure 12 As shown, in this embodiment, the fourth limiting member 144 includes a pusher 1441 and an elastic member 1442. One end of the elastic member 1442 is connected to the waist structure 112, and the other end is connected to the pusher 1441. The elastic member 1442 has the tendency to drive the pusher 1441 toward the flow-blocking membrane 120 so that the flow-blocking membrane 120 is in contact with the upper plate surface.

[0061] like Figure 12As shown, in this embodiment, the fourth limiting member 144 further includes a fixing plate 1443 and a fixing tube 1444. The fixing plate 1443 is fixedly connected to the inside of the fixing tube 1444, and the fixing tube 1444 is fixedly connected to the waist structure 112. One end of the elastic member 1442 is fixedly connected to the fixing plate 1443, and the other end is connected to the push head 1441. In this embodiment, the fixing plate 1443 is connected to the fixing tube 1444 by a snap-fit.

[0062] like Figure 12 As shown, since there are two disc bodies 111, the fourth limiting member 144 includes two push heads 1441 and elastic members 1442 that are symmetrically arranged relative to the fixed disc 1443. The two push heads 1441 are respectively arranged towards the first disc body 1111 and the second disc body 1112.

[0063] like Figure 12 As shown, in this embodiment, the elastic element 1442 includes a spring 14421 and an elastic rope 14422. The elastic rope 14422 is arranged along the axial direction of the spring 14421 and is located inside the spring 14421. The elastic force of the elastic rope 14422 is less than the elastic force of the spring 14421. The spring 14421 is in a compressed state and tends to drive the push head 1441 toward the flow-blocking membrane 120 so that the flow-blocking membrane 120 is in contact with the upper plate surface. The elastic rope 14422 is in an extended state, and the elastic force of the elastic rope 14422 is opposite to the elastic force of the spring 14421. The elastic rope 14422 tends to drive the push head 1441 to compress the spring 14421, so that the push head 1441 and the spring 14421 maintain a mutually stressed state, preventing the push head 1441 and the spring 14421 from swinging. Moreover, the elastic coefficient of spring 14421 is greater than that of elastic rope 14422. When the deformation lengths of spring 14421 and elastic rope 14422 are the same, the elastic force of the spring is still greater than that of the elastic rope.

[0064] Understandably, in the natural state of the plug 100, the disc 111... Figure 11 In the open state shown, because the disc 111 has a woven mesh structure, it tends to compress inwards. Figure 12 At this time, the disk 111 tends to adhere inward to the flow-blocking film 120. For example... Figure 12As shown, in embodiment four, the flow-blocking membrane 120 is subjected to an elastic force from the elastic member 1442 that drives the pusher 1441 toward the flow-blocking membrane 120, so that the flow-blocking membrane 120 adheres to the upper disk surface. The disk body 111 transmits a force opposite to the elastic force of the elastic member 1442 to the flow-blocking membrane 120, and the forces on both sides of the flow-blocking membrane 120 are balanced. When the plugger 100 needs to be sheathed, the plugger 100 is stretched axially, and the force opposite to the elastic force of the elastic member 1442 on the disk body 111 gradually decreases. At this time, the flow-blocking membrane 120 moves axially with the disk body 111 under the action of the elastic force of the elastic member 1442, so that the flow-blocking membrane 120 remains taut and adheres to the inner side of the disk body 111. When the plugger 100 is unsheathed, the disk body 111 of the plugger 100 gradually returns to its original state. Figure 11 In the open state shown, the disc 111 transmits a force opposite to the elastic force of the elastic element 1442 to the flow-blocking membrane 120, and the pusher 1441 retracts to the position shown. Figure 12 The location shown.

[0065] like Figures 11 to 13 As shown, in Embodiment 4, after connecting the outer peripheral edge of the flow-blocking membrane 120 to the edge of the upper disk surface via the connecting line 130, the fourth limiting member 144 abuts against the center of the flow-blocking membrane 120, so that the flow-blocking membrane 120 keeps in contact with the disk body 111. This ensures that the flow-blocking membrane 120 remains in contact with the disk body 111 during deformation, thereby preventing the flow-blocking membrane 120 from shifting or wrinkling during sheathing and insertion. It also ensures that the flow-blocking membrane 120 is subjected to uniform force after sheathing, insertion, and implantation into the human body, forming a stable flow-blocking effect.

[0066] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A sealing device, characterized in that, The device includes a support and a flow-blocking membrane. The support includes a disc body composed of two layers of discs. The flow-blocking membrane is placed between the two layers of discs of the disc body. The outer peripheral edge of the flow-blocking membrane is connected to the disc body by a connecting line. The flow-blocking membrane located radially inside the outer peripheral edge is limited to the disc body by a limiting member. The limiting member acts on the central region of the flow-blocking membrane or is arranged around the central region of the flow-blocking membrane, so that the interior of the flow-blocking membrane remains taut. The limiting member includes a fourth limiting member. There are two discs, namely a first disc and a second disc. The bracket also includes a waist structure connected between the first disc and the second disc. The fourth limiting member is located inside the waist structure and abuts against the center of the flow-blocking membrane, so that the flow-blocking membrane tends to adhere to the disc. The fourth limiting member includes a pusher and an elastic member. One end of the elastic member is connected to the disc and the other end is connected to the pusher. The elastic member has the tendency to drive the pusher toward the flow-blocking membrane so that the flow-blocking membrane adheres to the upper disc surface.

2. The occluder according to claim 1, characterized in that, The disc body has a top protruding at the center of one of the outer surfaces of the double-layered disc body, and a sealing member is fitted around the outer periphery of the top protrusion.

3. The occluder according to claim 2, characterized in that, The limiting member includes a first limiting member, which is located at the center of the flow-blocking membrane and extends through the top end. The first limiting member connects the center of the flow-blocking membrane to the top end of the disk body, so that the flow-blocking membrane and the disk body remain in contact.

4. The occluder according to claim 3, characterized in that, The first limiting member is a suture line. One end of the first limiting member is fixedly connected to the center of the flow-blocking membrane, and the other end passes through the center of the disc body and is knotted and fixed on the outside of the disc body.

5. The plugging device according to claim 2, characterized in that, The limiting member includes a second limiting member, which has an annular structure and is arranged around the top end. The second limiting member connects the flow-blocking membrane to the disk body, so that the flow-blocking membrane and the disk body remain in contact.

6. The occluder according to claim 5, characterized in that, The second limiting member is a stitch, which runs continuously around the top end to connect the flow-blocking membrane to the disc body.

7. The plugging device according to claim 2, characterized in that, The limiting member includes a third limiting member, which is arranged radially along the flow-blocking membrane, and multiple third limiting members are spaced apart. The third limiting member connects the flow-blocking membrane to the disk body, so that the flow-blocking membrane and the disk body remain in contact.

8. The plugging device according to claim 7, characterized in that, The third limiting member is a suture line, which runs continuously along the radial direction of the flow-blocking membrane, and is located radially between the outer peripheral edge of the flow-blocking membrane and the top end.

9. The occluder according to claim 1, characterized in that, One end of the elastic element is connected to the waist structure.

10. The plugging device according to claim 9, characterized in that, The fourth limiting member also includes a fixing plate and a fixing tube. The fixing plate is connected to the inside of the fixing tube, and the fixing tube is connected to the waist structure. One end of the elastic member is fixedly connected to the fixing plate, and the other end is connected to the push head.

11. The occluder according to claim 1, characterized in that, The elastic element includes a spring and an elastic rope. The spring and the elastic rope have opposite elastic force directions. The spring has a tendency to drive the push head toward the flow-blocking membrane, and the elastic coefficient of the spring is greater than that of the elastic rope.

12. The occluder according to claim 1, characterized in that, The fourth limiting member includes two sets of connected push heads and elastic members, with the two push heads arranged back to back and facing the first disc and the second disc respectively.

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