Covered stent

Abstract

This application relates to the field of interventional medical devices and discloses a covered stent, including a cover, a support component, and a cut bare stent. The support component includes multiple support coils arranged along a first direction, all of which are disposed on the cover to support it. The cut bare stent is connected to one end of the cover. The cut bare stent includes a connected support portion and an extension portion. The support portion is located outside the cover and is used to abut against and support the inner wall of the blood vessel. The diameter of the support portion gradually increases along the direction away from the extension portion. The extension portion extends along the first direction to the inner side of the end of the cover, and at least a portion of the extension portion overlaps with the support component. The first direction is the direction from the distal end of the covered stent to the proximal end. The covered stent of this application can improve the sealing between the end of the covered stent and the blood vessel wall, ensuring the success rate of minimally invasive surgery and facilitating disease treatment.

Description

Technical Field

[0001] This application relates to the field of interventional medical devices, and more particularly to a covered stent. Background Technology

[0002] Minimally invasive surgery for vascular repair with covered stents is widely used to treat aortic diseases due to its small incision, rapid recovery, and good immediate results. In clinical implantation, the covered stent is pre-loaded into the sheath of the delivery system. It is then transported through the lumen of the blood vessel to the lesion site via the delivery system, and finally released from the sheath. The covered stent isolates blood flow from the lesion site, thereby achieving the therapeutic goal.

[0003] However, after existing covered stents are released in the body, the ends of the covered stents tend to collapse inward, reducing the sealing performance of the covered stents and hindering disease treatment. Summary of the Invention

[0004] The purpose of this application is to provide a covered stent that aims to improve the sealing performance of the ends of the covered stent.

[0005] To achieve the above objectives, this application provides a covered stent, including a covering, a support component, and a cut bare stent; the support component includes a plurality of support coils arranged along a first direction, all of which are disposed on the covering to support the covering, and the cut bare stent is connected to one end of the covering; the cut bare stent includes a support portion and an extension portion connected to each other, the support portion being located outside the covering and used to abut against and support the inner wall of the blood vessel, and the diameter of the support portion gradually increases along the direction away from the extension portion; the extension portion extends along the first direction to the inner side of the end of the covering, and at least a portion of the extension portion overlaps with the support component; wherein, the first direction is the direction from the distal end of the covered stent to the proximal end.

[0006] In some embodiments of the present invention, the plurality of support waverings includes a first support wavering, which is disposed around the inner side of the end of the coating. The first support wavering includes a plurality of large waverings and a plurality of small waverings, with the large waverings connected to both sides of each small wavering.

[0007] In some embodiments of the present invention, the support component includes a spring bracket disposed on the outer side of the end of the film, the spring bracket including a plurality of spring coils extending along the first direction, the plurality of spring coils being connected to the film and arranged at intervals along the circumference of the film; the circumference of the spring coils is provided with fibers.

[0008] In some embodiments of the present invention, the support component includes a filling bag disposed at the end of the film, the filling bag having a filling opening and a support ring disposed on the filling opening, the filling bag being used to fill material through the filling opening to make the filling bag bulge.

[0009] In some embodiments of the present invention, the support member includes a fiber loop disposed on the coating and on the side of the first support loop near its proximal end.

[0010] In some embodiments of the present invention, the extension includes a plurality of extension frames for connecting the film, and the support includes a plurality of support members, each of which is connected between two adjacent extension frames; wherein, along a direction away from the extension, the support members extend outward in an arc-shaped protrusion.

[0011] In some embodiments of the present invention, at least one side of the extension frame is provided with an extension bracket; and / or, the extension bracket is at least partially overlapped with the support member.

[0012] In some embodiments of the present invention, the extension frame includes a connecting section and an inner support section, one end of the connecting section is connected to the support member, the other end is connected to the inner support section, and the connecting section is connected to the covering film.

[0013] In some embodiments of the present invention, the connecting section is provided with a recessed portion that is recessed toward the inside of the cutting bracket, and the inner support section is arranged parallel to the inner wall of the coating along the first direction.

[0014] In some embodiments of the present invention, the extension frame is integrally connected to the film, and the portion of the extension frame away from the support is inclined toward the inner wall of the film in a direction away from the support; or, the portion of the extension frame away from the support is inclined toward the inner wall of the film in a direction away from the support.

[0015] In some embodiments of the present invention, the outer side of the extension frame is provided with barbs, the barbs of the extension frame are located within the wavelet loop; and / or, the barbs of the extension frame are located on the side of the wavelet loop away from the support portion.

[0016] In some embodiments of the present invention, the extension includes a plurality of extension frames connected to the film, the plurality of extension frames and the plurality of wavelet loops are corresponding one-to-one, the extension frame is at least partially overlapped with the wavelet loop, and the portion of the extension frame located outside the wavelet loop along the first direction is connected and fixed to the film.

[0017] In the covered stent provided in this application, the support member at the end of the covered stent provides stable support to the end of the covered stent, ensuring radial support force at the end of the covered stent. Furthermore, the extension extends into the inner side of the end of the covered stent, with at least a portion of the extension overlapping the support member, allowing the extension to extend sufficiently within the covered stent. This ensures sufficient support length for the covered stent when supporting the end of the covered stent. Additionally, after the covered stent is released in vivo, the support member abuts against the blood vessel. When the blood vessel wall compresses the support member inward, the extension receives an outward force through leverage and abuts against the inner wall of the covered stent and at least a portion of the support member, increasing the support force on the end of the covered stent. This allows the end of the covered stent to tightly abut against the blood vessel wall, thereby improving the sealing performance of the end of the covered stent, ensuring the success rate of minimally invasive surgery, and facilitating disease treatment. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art 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 based on the structures shown in these drawings without creative effort.

[0019] Figure 1 This is one of the structural schematic diagrams of the cut bare support provided in the embodiments of this application;

[0020] Figure 2 This is one of the schematic diagrams illustrating the support principle of the cut bare bracket provided in the embodiments of this application;

[0021] Figure 3 This is one of the structural schematic diagrams of the film-coated stent provided in the embodiments of this application;

[0022] Figure 4 This is the second schematic diagram of the structure of the cut bare support provided in the embodiments of this application;

[0023] Figure 5 This is the second schematic diagram of the structure of the covered stent provided in the embodiments of this application;

[0024] Figure 6 This is the third schematic diagram of the structure of the cut bare support provided in the embodiments of this application;

[0025] Figure 7 This is the third schematic diagram of the structure of the covered stent provided in the embodiments of this application;

[0026] Figure 8 This is the fourth schematic diagram of the structure of the cut bare support provided in the embodiments of this application;

[0027] Figure 9This is the fifth schematic diagram of the structure of the cut bare support provided in the embodiments of this application;

[0028] Figure 10 This is the second schematic diagram of the support principle of the cut bare bracket provided in the embodiments of this application;

[0029] Figure 11 This is the sixth schematic diagram of the structure of the cut bare support provided in the embodiments of this application;

[0030] Figure 12 This is the third schematic diagram of the support principle of the cut bare bracket provided in the embodiments of this application;

[0031] Figure 13 This is the seventh schematic diagram of the structure of the cut bare support provided in the embodiments of this application;

[0032] Figure 14 This is the fourth schematic diagram of the support principle of the cut bare bracket provided in the embodiments of this application;

[0033] Figure 15 This is the fourth schematic diagram of the structure of the covered stent provided in the embodiments of this application;

[0034] Figure 16 yes Figure 15 Enlarged view of point A in the middle;

[0035] Figure 17 This is the fifth schematic diagram of the structure of the covered stent provided in the embodiments of this application;

[0036] Figure 18 This is the sixth schematic diagram of the structure of the covered stent provided in the embodiments of this application;

[0037] Figure 19 This is the seventh schematic diagram of the structure of the covered stent provided in the embodiments of this application;

[0038] Figure 20 yes Figure 19 Enlarged view of point B in the middle.

[0039] Explanation of icon numbers:

[0040] a: First direction;

[0041] 1000: Covered stent;

[0042] 100: Cut the bare support;

[0043] 10: Support component; 11: Support member; 111: Sub-bracket; 12: Supporting part; 13: First barb; 20: Extension part; 21: Extension frame; 211: Connecting section; 2111: Recessed part; 212: Inner support section; 22: Connecting hole; 23: Second barb; 24: Extension bracket;

[0044] 200: Lamination;

[0045] 300: First support wave loop; 301: Large wave loop; 302: Small wave loop;

[0046] 400: Spring support; 401: Spring coil; 402: Fiber fibers;

[0047] 500: Fiber loops;

[0048] 600: Filler bag; 601: Support ring;

[0049] 700: Guide wire. Detailed Implementation

[0050] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0051] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of this application are only used to explain the relative positional relationship and movement of each component in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0052] It should also be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on the other component or may be connected to an intermediary component. When a component is referred to as being "connected to" another component, it can be directly connected to the other component or indirectly connected to the other component through an intermediary component.

[0053] Furthermore, the use of terms such as "first" and "second" in this application is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed in this application.

[0054] To more clearly describe the structure of this application, the terms "proximal" and "distal" are used herein as conventional terms in the field of interventional medicine. Specifically, "distal" refers to the end furthest from the operator during the surgical procedure, "proximal" refers to the end closest to the operator during the surgical procedure, "axial" refers to its length direction, and "radial" refers to the direction perpendicular to the "axial".

[0055] Covered stents typically consist of a covering and supporting coils. The supporting coils have a consistent shape. To support the proximal end of the covered stent, a bare stent is connected there. The bare stent and supporting coils are placed parallel to each other. A portion of the proximal end of the covered stent is not covered by the supporting coils; the bare stent is sutured to this uncovered portion of the proximal end of the covered stent. In minimally invasive covered stent vascular repair surgery, after the covered stent is released in the body, the proximal portion of the covered stent, lacking supporting coils, is prone to deformation. Furthermore, the bare stent is insufficient to support the proximal end of the covered stent, causing the end of the covered stent to easily collapse inward, reducing its seal. Reduced seal may allow the vascular lesion to connect with the blood vessel, leading to surgical failure and hindering disease treatment.

[0056] Therefore, this application provides a method for cutting bare stents and covered stents, which can improve the sealing of the ends of the covered stent, ensure the success rate of minimally invasive surgery, and benefit the treatment of diseases.

[0057] The following detailed description of some embodiments of this application is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0058] like Figures 1 to 3 As shown in the embodiment of this application, the cut bare stent 100 is applied to the coated stent 1000. The coated stent 1000 includes a coating 200 and a support member. The cut bare stent 100 includes a support portion 10 and an extension portion 20 connected to each other.

[0059] The support portion 10 is located outside the covering 200 and abuts against the inner wall of the blood vessel, thereby anchoring the cut bare stent 100 and the covered stent 1000 within the blood vessel. The diameter of the support portion 10 gradually increases in the direction away from the extension portion 20; the extension portion 20 extends along a first direction a to the inner side of the end of the covering 200, and at least a portion of the extension portion 20 overlaps with the support component. Herein, the first direction a is the length extension direction of the covered stent 1000.

[0060] It should be noted that, in order to ensure support for the cover 200, the support portion 10 and the extension portion 20 of the cut bare stent 100 are both arranged around the periphery, so that the support portion 10 can abut against the peripheral blood vessel wall, and the extension portion 20 can also support the peripheral inner wall of the cover 200. That is, the cut bare stent 100 and the cover stent 100 are tubular structures.

[0061] It should be noted that the diameter of the support portion 10 gradually increases along the direction away from the extension portion 20, which means that the support portion 10 has a flared structure. Compared with the bare stent arranged parallel to the cover 200, it is easier to abut against the blood vessel wall when it is released into the blood vessel. Then, under the compression of the blood vessel, through the leverage effect, the extension portion 20 can further press against the inner wall of the cover 200 and at least part of the support component.

[0062] It should be noted that at least a portion of the extension 20 overlaps with the support member, meaning that the projection of the extension 20 and the projection of the support member at least partially coincide in the radial direction of the film support 1000. In this way, when the extension 20 supports the film 200, it lifts part of the support member at the end of the film 200, resulting in better and more stable support compared to supporting the film 200 without a support.

[0063] In this embodiment of the application, the support member at the end of the cut bare support 100 and the film 200 can provide stable support to the end of the film 200 to ensure radial support force at the end of the film 200. Furthermore, the extension 20 extends into the inner side of the end of the film 200, with at least a portion of the extension 20 overlapping the support member, allowing the extension 20 to extend sufficiently within the film 200. This ensures sufficient support length for the film 200 when supporting the end of the film 200 through the extension 20. In addition, after the covered stent 1000 is released in the body, the support portion 10 will abut against the blood vessel. When the blood vessel wall squeezes the support portion 10 inward, the extension portion 20 will receive an outward force through the leverage effect and abut against the inner wall of the covered stent 200 and at least part of the support component to increase the support force on the end of the covered stent 200, so that the end of the covered stent 1000 can abut against the blood vessel wall tightly. Therefore, the sealing of the end of the covered stent 1000 can be improved, ensuring the success rate of minimally invasive surgery and facilitating the treatment of the disease.

[0064] like Figures 1 to 3As shown, in some embodiments, the extension 20 includes multiple extension frames 21 for connecting the covering film 200, and the support 10 includes multiple support members 11, each support member 11 connecting to two adjacent extension frames 21. The support members 11 extend outwards in a direction away from the extension 20. It should be noted that, in this description of direction, "outwards" refers to the side of the bare cutting support 100 away from its interior. The extension frames 21 connect the covering film 200 so that the extension 20 can be stably placed on the inner wall of the covering film 200 when released, thereby stably supporting the covering film 200. In this embodiment, adjacent support members 11 are connected by extension frames 21, and adjacent extension frames 21 are connected by support members 11. The multiple support members 11 and multiple extension frames 21 are staggered to form a ring around the bare cutting support 100. Each support member 11 is inclined outwards. Thus, when the vessel wall compresses two adjacent support members 11, the two support members 11 can leverage each other to press their connected extension frames 21 outwards, thus stably supporting the covered stent 200. When the vessel wall compresses multiple support members 11, multiple extension frames 21 can be pressed outwards to increase the supporting force on the end of the covered stent 200, ensuring that the end of the covered stent 1000 can tightly abut against the vessel wall.

[0065] For example, the support member 11 is connected to the end of the extension frame 21. When the support member 11 acts on the support member 21 through the leverage effect, the effect is more obvious, the radial support force of the extension frame 21 on the membrane 200 is also greater, and the membrane 200 can also fit more tightly against the blood vessel wall.

[0066] For example, multiple support members 11 and multiple extension frames 21 are integrally formed to ensure the overall structural strength of the cut bare support frame 100.

[0067] like Figure 1 and Figure 2 As shown, in some embodiments, the support member 11 is arranged in an arc-shaped protrusion outward along the direction away from the extension 20. With this arrangement, the support member 11 can reduce the stimulation of the blood vessel wall when it comes into contact with the blood vessel wall; on the other hand, the blood vessel wall can also more easily compress the support member 11 so that the end of the covered stent 1000 can fit tightly against the blood vessel wall.

[0068] like Figure 1 and Figure 2As shown, in some embodiments, the support member 11 includes two sub-supports 111, with one end of the two sub-supports 111 connected to each other away from the extension 20, and the other ends of the two sub-supports 111 respectively connected to two adjacent extension frames 21. By configuring the support member 11 as two sub-supports 111, the cutting bare stent 100 is made lighter overall while increasing the anchoring force with the vascular wall, ensuring that the cutting bare stent 100 can be firmly anchored within the blood vessel, which is beneficial for minimally invasive surgery. It can be understood that the two sub-supports 111 and their commonly connected extension frames 21 will form a Y-shape, so that the two sub-supports 111 can simultaneously act on one extension frame 21 to increase the outward radial support force of the extension frame 21, further improving the sealing performance of the end of the covered stent 1000.

[0069] For example, each sub-support 111 is provided in an arc-shaped protrusion outward along the direction away from the extension 20.

[0070] like Figure 1 and Figure 2 As shown, in some embodiments, the end of the support member 11 away from the extension 20 is provided with a supporting portion 12, and a first barb 13 is provided on the outer side of the supporting portion 12. The first barb 13 is used to anchor the vessel wall outside the covering 200. It should be noted that in the description of the lateral position here, the outer side is the side of the cut bare stent 100 away from the interior of the cut bare stent 100. The first barb 13 can anchor one end of the support member 11 to the vessel wall, preventing the cut bare stent 100 from moving. When the support member 11 is squeezed by the vessel wall, the leverage effect of the support member 11 is more obvious, and the radial support force of the extension 21 on the covering 200 is also greater, and the covering 200 can also fit more tightly against the vessel wall. Furthermore, the anchoring of the part of the cut bare stent 100 located outside the covering 200 can also make the covering stent 1000 as a whole stable in the lesion position, which is beneficial to the treatment of the disease.

[0071] For example, in each support member 11, the ends of two sub-supports 111 away from the extension frame 21 are connected to the abutment portion 12, so that the cut bare support 100 is connected around the whole.

[0072] For example, the first barb 13 is inclined outward on the side facing the extension frame 21, so that when the bare stent 100 is released after cutting, it can be anchored to the blood vessel wall outside the membrane 200 without irritating the blood vessel wall. In the specific manufacturing process, a U-shaped cutting hole can be made on the supporting part 12, and the part surrounding the U-shaped cutting hole can be bent outward to obtain the first barb 13.

[0073] like Figure 4 and Figure 5As shown, in some embodiments, the outer side of the extension frame 21 is provided with a second barb 23, which is used to anchor the vessel wall from within the covering 200. It should be noted that in the description of the lateral position here, the outer side refers to the side of the cut bare stent 100 that faces away from the interior of the cut bare stent 100. The provided second barb 23 can anchor the covering 200 to the vessel wall, which on the one hand stabilizes the covered stent 1000, and on the other hand further improves the sealing of the end of the covered stent 1000. In this embodiment, the second barb 23 can be anchored to the vessel wall by pressing against the covering 200, or it can be anchored to the vessel wall by puncturing the covering 200. It should be noted that there is no supporting component at the position corresponding to the second barb 23. Therefore, in this embodiment, the supporting component can be provided with a clearance space at the position of the second barb 23 to avoid the supporting component affecting the anchoring of the second barb 23 to the vessel wall.

[0074] For example, the second barb 23 is inclined outward on the side facing the extension frame 21, so that when the bare stent 100 is cut and released, it can anchor the blood vessel wall from within the covering 200 without irritating the blood vessel wall. In the specific manufacturing process, a U-shaped cutting hole can be made on the extension frame 21, and the part surrounding the U-shaped cutting hole can be bent outward to obtain the second barb 23.

[0075] like Figure 6 and Figure 7 As shown, in some embodiments, extension brackets 24 are provided on both sides of the extension frame 21. The extension brackets 24 can increase the support area of ​​the extension 20 on the film 200, so as to further stabilize the support of the film 200 and ensure the sealing of the end of the film bracket 1000.

[0076] like Figure 6 and Figure 7 As shown, in some embodiments, the extension stent 24 is at least partially configured to overlap with the support member. The overlap between the extension stent 24 and the support member allows the extension stent 24 to directly press against the support member when the membrane 200 is supported by the extension portion 20, thereby supporting the end of the membrane 200. This results in better support for the membrane 200 and a more stable and tighter fit against the blood vessel wall.

[0077] For example, the two extension brackets 24 are respectively arranged in a direction opposite to the extension bracket 21 and in a first direction a. This is to maximize the support area of ​​the entire extension 20 to stably support the film 200.

[0078] like Figure 1 and Figure 3As shown, in some embodiments, the extension frame 21 is provided with at least two connection holes 22 for fastening to the covering membrane 200. Multiple extension frames 21 can be fastened to the inner wall of the covering membrane 200 through their connection holes 22, thus stably connecting the cut bare stent 100 and the covering membrane 200. The cut bare stent 100 can be stably positioned at the end of the covering membrane 200. When the covering membrane stent 1000 is released, the covering membrane 200 and the cut bare stent 100 can be opened together to block the lesion. The cut bare stent 100 can be stably positioned at the end of the covering membrane 200. The support of the cut bare stent 100 at the end of the covering membrane 200 by the cut bare stent 100 improves the sealing of the covering membrane stent 1000, preventing situations where some extension frames 21 fail to support the covering membrane 200 or where the cut bare stent 100 detaches from the covering membrane 200. Of course, in other embodiments, more connection holes 22 can be provided to further stably connect the cut bare stent 100 and the covering membrane 200. It should be noted that there is no supporting component at the position corresponding to the connection hole 22. Therefore, in this embodiment, the supporting component can be provided with clearance space at the position of the connection hole 22 to ensure the connection between the connection hole 22 and the film 200.

[0079] For example, the two connecting holes 22 are spaced apart along the first direction a. After the film 200 is fastened through the two connecting holes 22, the extension frame 21 can be extended along the first direction a to stably support the film 200.

[0080] For example, when connecting the cut bare support 100 and the cover 200, a suture can be passed through the connection hole 22 to suture to the inner wall of the cover 200, thereby achieving a tight connection with the cover 200.

[0081] like Figures 1 to 7 As shown, in some embodiments, the extension frame 21 is integrally connected to the covering membrane 200. Specifically, both ends of the extension frame 21 along the first direction a are tightly connected to the covering membrane 200. For example, when the covering membrane 200 is tightly connected through two connecting holes 22, the two connecting holes 22 are located at both ends of the extension frame 21. When the support member 11 acts on the extension frame 21 through a lever effect, the connection position on the extension frame 21 near the support member 11 actually acts as a lever fulcrum. Thus, when the blood vessel wall compresses the support member 11, the part of the extension frame 21 located at the lever fulcrum and away from the support member 11 will press against the covering membrane 200, so that the end of the covered stent 1000 can tightly abut against the blood vessel wall, thereby improving the sealing performance of the covered stent 1000.

[0082] like Figures 4 to 7 As shown, by way of example, when the second barb 23 is provided, the second barb 23 is provided between the two connecting holes 22 so that the extension frame 21 has a compact and reasonable structure.

[0083] like Figure 8 As shown, in some embodiments, the extension stent 21 includes a connecting section 211 and an inner support section 212. One end of the connecting section 211 is connected to the support member 11, and the other end is connected to the inner support section 212. The connecting section 211 is used to connect to the covering 200. With this arrangement, the extension stent 21 can extend further into the covering 200. The increased length of the extension stent 21 extending into the covering 200 can further improve the support for the covering 200, thus preventing the end of the covering 200 from collapsing. When the support member 11 acts on the extension stent 21 through a lever effect, the connecting section 211 is actually positioned as a lever fulcrum. Thus, when the blood vessel wall compresses the support member 11, the inner support section 212 can more significantly press against the inner wall of the covering 200, thereby increasing the support force on the end of the covering 200. This allows the end of the covered stent 1000 to tightly abut against the blood vessel wall, thereby improving the sealing performance of the covered stent 1000.

[0084] For example, the connecting segment 211 is provided with two connecting holes 22 to secure the connecting membrane 200.

[0085] like Figure 9 and Figure 10 As shown, in some embodiments, the connecting segment 211 has a recessed portion 2111 that is recessed inward along the first direction a, and the inner support segment 212 is arranged parallel to the inner wall of the covering 200 along the first direction a. When the support member 11 acts on the extension frame 21 through the lever effect, the position of the connecting segment 211 is actually the fulcrum of the lever, and it will deform under the action of the lever effect. The recessed portion 2111 on the connecting segment 211 can concentrate the deformation in the recessed portion 2111, so that the inner support segment 212 can maintain parallel movement as much as possible. Since the inner support segment 212 is arranged parallel to the inner wall of the covering 200 along the first direction a, the inner support segment 212 will press against the inner wall of the covering 200. In this way, the pressing area of ​​the extension segment 20 against the covering 200 can be increased, the area of ​​tight contact between the covering 200 and the blood vessel wall can be increased, the stimulation of the covering stent 1000 on the blood vessel wall can be reduced, and the sealing between the covering stent 1000 and the blood vessel wall can be improved.

[0086] For example, the connecting segment 211 is provided with two connecting holes 22, which are respectively located on both sides of the recess 2111 along the first direction a, so that the connecting segment 211 can stably realize the function of the lever fulcrum.

[0087] For example, the second barb 23 is provided on the outside of the inner support member so that when the inner support member presses against the membrane 200, the membrane 200 can be anchored to the blood vessel wall.

[0088] like Figure 11 and Figure 12As shown, in some embodiments, the extension frame 21 is integrally connected to the covering membrane 200, and the portion of the extension frame 21 away from the support portion 10 is inclined toward the inner wall of the covering membrane 200 in a direction away from the support portion 10. In this embodiment, the connection position on the extension frame 21 near the support member 11 actually acts as a lever fulcrum. When the blood vessel wall compresses the support member 11, the portion of the extension frame 21 away from the support portion 10 will tilt in a direction away from and parallel to the inner wall of the covering membrane 200. In this way, the pressure of the extension portion 20 on the covering membrane 200 can be increased, and the sealing between the covering stent 1000 and the blood vessel wall can be improved.

[0089] For example, the portion of the extension frame 21 near the support member 11 is arranged parallel to the inner wall of the membrane 200. This ensures that it can serve as a stable support point to lift the portion of the extension frame 21 away from the support member 10.

[0090] For example, the extension frame 21 is provided with two connection holes 22, and the second barb 23 is located between the two connection holes 22. One connection hole 22 is located in the part of the extension frame 21 near the support member 11, and the second barb 23 and the other connection hole 22 are located in the part of the extension frame 21 away from the support member 11, so that when the extension frame 21 away from the support member 10 presses against the membrane 200, the membrane 200 can be anchored to the blood vessel wall.

[0091] like Figure 13 and Figure 14 As shown, in some other embodiments, the extension frame 21 is integrally connected to the covering membrane 200, and the portion of the extension frame 21 away from the support portion 10 is inclined in a direction away from the support portion 10 and away from the inner wall of the covering membrane 200. In this embodiment, the connection position on the extension frame 21 near the support member 11 actually acts as a lever fulcrum. When the blood vessel wall compresses the support member 11, the portion of the extension frame 21 away from the support portion 10 will tilt in a direction parallel to the inner wall of the covering membrane 200. In this way, the pressure area of ​​the extension portion 20 against the covering membrane 200 can be increased, thereby increasing the area of ​​tight contact between the covering membrane 200 and the blood vessel wall, reducing the stimulation of the covering stent 1000 on the blood vessel wall, and improving the sealing between the covering stent 1000 and the blood vessel wall.

[0092] For example, the portion of the extension frame 21 near the support member 11 is arranged parallel to the inner wall of the membrane 200. This ensures that it can serve as a stable support point to lift the portion of the extension frame 21 away from the support member 10.

[0093] For example, the extension frame 21 is provided with two connection holes 22, and the second barb 23 is located between the two connection holes 22. One connection hole 22 is located in the part of the extension frame 21 near the support member 11, and the second barb 23 and the other connection hole 22 are located in the part of the extension frame 21 away from the support member 11, so that when the extension frame 21 away from the support member 10 presses against the membrane 200, the membrane 200 can be anchored to the blood vessel wall.

[0094] like Figure 3 As shown, the film-coated support 1000 of this application embodiment includes a film 200, a support component, and a cut bare support 100.

[0095] The support component includes multiple support corrugations arranged along the first direction a, all of which are arranged around the periphery of the covering film 200 to support the covering film 200. The cut bare support 100 is connected to one end of the covering film 200.

[0096] It is important to understand that the covering 200 has a certain length. To ensure the overall support of the covering 200, multiple support coils can be used to support various positions along the length of the covering 200, ensuring the seal between the covered stent 1000 and the vessel wall, and ensuring that blood can flow smoothly through the covered stent 1000 to isolate the lesion site. For example, the support coils include corrugated metal support wires arranged around the periphery of the covering 200 to stably support the covering 200.

[0097] In this embodiment of the application, the film support 1000 provides stable support for the film 200 through its support corrugated coil and end support member, ensuring radial support force at the end of the film 200. Furthermore, the extension 20 extends into the inner side of the end of the film 200, with at least a portion of the extension 20 overlapping the support member, allowing the extension 20 to extend sufficiently within the film 200. This ensures sufficient support length for the film 200 when supporting its end. In addition, after the covered stent 1000 is released in the body, the support portion 10 will abut against the blood vessel. When the blood vessel wall squeezes the support portion 10 inward, the extension portion 20 will receive an outward force through the leverage effect and abut against the inner wall of the covered stent 200 and at least part of the support component to increase the support force on the end of the covered stent 200, so that the end of the covered stent 1000 can abut against the blood vessel wall tightly. Therefore, the sealing of the end of the covered stent 1000 can be improved, ensuring the success rate of minimally invasive surgery and facilitating the treatment of the disease.

[0098] like Figure 3As shown, in some embodiments, the multiple support coils include a first support coil 300, which is arranged around the inner side of the end of the covering 200 to ensure that the outer side of the covering 200 at the end of the covered stent 1000 is flat, avoiding gaps between the covering 200 and the blood vessel, thereby ensuring the sealing of the covered stent 1000. The first support coil 300 includes multiple large coils 301 and multiple small coils 302. In the embodiments of the present invention, the large coils 301 and the small coils 302 are quadrilateral structures similar to rhombuses, and the length of the small coils 302 in the first direction is less than the length of the large coils 301 in the first direction. Each small wavelet 302 is connected to two large wavelets 301 on both sides. The extension 20 includes multiple extension frames 21 connected to the covering 200. The multiple extension frames 21 correspond one-to-one with the multiple small wavelets 302. The extension frames 21 are at least partially overlapped with the small wavelets 302, and the extension frames 21 are located on both sides of the small wavelets 302 along the first direction a and are connected and fixed to the covering 200. It should be noted that the first support wavelet 300 is located between the extension frame 21 and the covering 200. The first support wavelet 300 is arranged around the inner side of the end of the covering 200, which can ensure stable support for the end of the covering 200. Furthermore, under the support of cutting the bare stent 100, it can support the inner wall of the covering 200 and the first support wavelet 300, further preventing the covering 200 from collapsing inward and improving the sealing and anchoring performance between the end of the covered stent 1000 and the blood vessel wall. Furthermore, the small wavelet loop 302 ensures sufficient space between the coating 200 and the cut bare support 100 for connection, guaranteeing a stable connection between them. In this embodiment, the small wavelet loop 302 is used to fix the extension frame 21. Multiple large wavelet loops 301 can be provided between adjacent small wavelet loops 302, or only one large wavelet loop 301 can be provided. The arrangement is not limited, depending on the spacing of the extension frame 21 of the cut bare support 100. Depending on actual needs, the support wavelet loop can also be an open-loop structure, meaning the beginning and end of the support wavelet loop are not connected, or it can be a segmented structure.

[0099] For example, the two connecting holes 22 of the extension frame 21 are located on both sides of the small wavelet loop 302 along the first direction a, so as to be fastened by the suture and the position of the covering film 200 where no support member is provided. For example, the length of the large wavelet loop 301 along the first direction a is H1, the length of the small wavelet loop 302 along the first direction a is H2, and the lengths of the suture space of the two connecting holes 22 along the first direction a are H3 and H4, and the dimensional relationship of the three is H1 = H2 + H3 + H4.

[0100] For example, the first support wave 300 includes two metal support wires, which are arranged in a sinusoidal wave shape around the periphery of the coating 200, and the crests and troughs of the two metal support wires are arranged opposite each other along the first direction a, thereby forming multiple wave loops. Small wave loops 302 are formed at the positions where the crests and troughs of the two metal support wires are close to each other, and large wave loops 301 are formed at the positions where the crests and troughs of the two metal support wires are far apart.

[0101] For example, the first support coil 300 can also be cut from a metal tube, and the metal tube is cut into a tubular structure with a small coil 302 and a large coil 301 by cutting.

[0102] like Figure 7 As shown, by way of example, extension brackets 24 are provided on both sides of the extension frame 21. The two extension brackets 24 extend along the extension direction of the metal wire of the small wave coil 302 so that the two extension brackets 24 can support the small wave coil 302, further support the inner wall of the membrane 200 and the first support wave coil 300, prevent the membrane 200 from collapsing inward, and improve the sealing between the end of the membrane stent 1000 and the blood vessel wall.

[0103] like Figure 5 and Figure 7 As shown, in some embodiments, the second barb 23 of the extension frame 21 is disposed within the small wavelet loop 302 to avoid the supporting components affecting the anchoring of the second barb 23 to the blood vessel wall, ensuring that the second barb 23 can anchor to the blood vessel wall through the covering membrane 200. At the same time, while achieving stable support for the covering membrane 200, the length of the extension frame 21 can be shortened as much as possible, which is beneficial to manufacturing.

[0104] like Figure 8 and Figure 18 As shown, in some embodiments, the second barb is positioned on the side of the wavelet loop 302 away from the support portion 10 to prevent the support component from affecting the anchoring of the second barb 23 to the vessel wall, ensuring that the second barb 23 can anchor to the vessel wall through the covering membrane 200. Simultaneously, the increased length of the extension frame 21 within the covering membrane 200 further enhances the support for the covering membrane 200, preventing the ends of the covering membrane 200 from collapsing.

[0105] like Figure 17 and Figure 18As shown, in some embodiments, the stent component includes a fiber loop 500, which is arranged around the membrane 200 and on the side of the first support wave 300 facing the other end of the membrane 200. It should be noted that the small wave 302 in the first support wave 300 has gaps on both sides along the first direction a, and / or there are also gaps between the first support wave 300 and other support wave 300, posing a risk of leakage to the outer side of the covered stent 1000. Therefore, in this embodiment, the fiber loop 500 is provided in this gap to fill the gap and further improve the sealing of the end of the covered stent 1000. Furthermore, the fiber loop 500 can also cause blood flowing into the fiber loop 500 to quickly form a thrombus, filling the gap through thrombosis. In some embodiments, depending on actual needs, the fiber loop 500 can be an open-loop structure or a segmented structure.

[0106] like Figure 17 and Figure 18 As shown, in some embodiments, the fiber loop 500 includes a double layer of fiber yarn, each fiber yarn being woven from multiple fibers, making the fiber yarn resemble a rope to effectively fill gaps. Furthermore, each fiber yarn is connected to the first support loop 300 and its adjacent support loop, specifically, it can be tied to the first support loop 300 and its adjacent support loop. The two fiber loops are arranged in a corrugated pattern around the periphery of the covering film 200 to improve the support strength of the fiber loop 500.

[0107] like Figure 18 As shown, exemplarily, the second barb 23 on the extension frame 21 can be positioned in the area between two fiber loops, specifically between the crest of one fiber loop and the trough of the other, to further support the fiber loop 500. The extension frame 21 can cause the first supporting loop 300 and the fiber loop 500 to press tightly against the blood vessel wall, further improving the seal between the end of the covered stent 1000 and the blood vessel wall.

[0108] like Figure 15As shown, in some embodiments, the support component includes a spring support 400, which is disposed on the outer side of the end of the covering membrane 200. The spring support 400 includes a plurality of spring coils 401 extending along a first direction a. The plurality of spring coils 401 are connected to the covering membrane 200 and arranged circumferentially around the covering membrane 200. It should be noted that each spring coil 401 is connected to the outer side of the covering membrane 200. The plurality of spring coils 401 arranged in parallel are not easily contracted inward into the covering membrane 200, and have strong support for the covering membrane 200. Therefore, the spring support 400 can further support the covering membrane 200, prevent the end of the covering membrane 200 from collapsing, and ensure close contact with the blood vessel wall, thereby improving the sealing performance. Furthermore, the plurality of spring coils 401 can also be arranged to adapt to the blood vessel wall, so that the spring support 400 as a whole can better fit the blood vessel wall, thereby further improving the sealing performance between the spring support 401 and the blood vessel wall. In some embodiments, depending on actual needs, the spring coils 401 can be open-loop structures, that is, the ends of the spring coils 401 are not connected. The spring coil 401 can also be configured with a segmented structure.

[0109] like Figure 16 As shown, in some embodiments, the periphery of the spring coil 401 is provided with fibrous hairs 402. The fibrous hairs 402 can be sandwiched on the spring coil 401. The fibrous hairs 402 can fill the gaps where the covered stent 1000 cannot completely fit the blood vessel due to the twisting of the blood vessel. The spring stent 400 and the fibrous hairs 402 can hinder blood flow and can also cause the blood flowing into the spring stent 400 and the fibrous hairs 402 to quickly form a thrombus. The thrombosis of the blood fills the gaps, further improving the sealing of the end of the covered stent 1000.

[0110] For example, the periphery of the spring ring 401 may be intercalated with a plurality of fibers 402 arranged along the first direction a to further improve the sealing performance.

[0111] In some embodiments, the end of the covering 200 is disposed at the first support wave coil 300, and the spring support 400 can be disposed on the side of the first support wave coil 300 facing the other end of the covering 200, so as to combine with the first support wave coil 300 to further improve the support of the covering 200, thereby improving the sealing and anchoring of the end of the covered stent 1000. This also facilitates the sheathing of the covered stent 1000, making it easier to deliver the covered stent 1000 to the lesion site.

[0112] like Figure 15 As shown, in some other embodiments, the end of the film 200 is disposed on the first support wave 300, and the spring bracket 400 is disposed on the outside of the film 200 and opposite to the first support wave 300, so as to combine with the first support wave 300 to further improve the support of the film 200, thereby improving the sealing and anchoring of the end of the film bracket 1000.

[0113] like Figure 19 As shown, in some embodiments, the support component includes a filling bag 60, which is arranged around the outer side of the end of the covering 200. The filling bag 60 has a filling opening for filling material through the filling opening, causing the filling bag 60 to bulge. It should be noted that when not filled with material, the filling bag 60 is deflated and can be placed in the sheath for stable delivery. The bulging filling bag 60 can further fill the gap between the covered stent 1000 and the vessel wall, further improving the seal between the end of the covered stent 1000 and the vessel wall. In this embodiment, whether or not to fill with material can be selected according to specific needs. If the end of the covered stent 1000 fits well with the vessel wall, no material filling is required; if there is a gap between the end of the covered stent 1000 and the vessel wall, material can be filled. In some embodiments, the filling bag 60 can be segmented on the covered stent 1000 according to actual needs, for example, a segment of the filling bag 60 can be provided on a designated part of the covered stent 1000.

[0114] like Figure 20 As shown, exemplarily, the opening of the filling bag 60 is provided with a support ring 601. The support ring 601 provides support and can open the bag opening to facilitate the filling of material. In specific operation, the guide wire 700 can be inserted into the filling bag 60 according to the guidance of the support ring 601. Then, a guide sheath can be inserted along the guide wire 700, and material is injected through the guide sheath, causing the filling bag 60 to expand in volume and fill the gap between the covered stent 1000 and the blood vessel. The filling bag 60 can be made of a polymer material, such as silicone. The support ring 601 can be made of a radiopaque material, such as tantalum, nickel-titanium alloy, or gold, giving the support ring 601 radiopaque properties. The material can be medical adhesive.

[0115] The end of the covered stent 1000 in this embodiment can be the proximal end. Through the above structure, the proximal end of the covered stent 1000 can be stably sealed, effectively isolating the lesion site and facilitating treatment. Of course, the end of the covered stent 1000 can also be used as the distal end of the covered stent 1000 to stably seal the distal end of the covered stent 1000; there is no limitation.

[0116] In specific clinical implantation, the covered stent 1000 is first pre-loaded into the sheath of the delivery system. After passing through the lumen of the human blood vessel, the covered stent 1000 is delivered to the lesion site through the delivery system. Then, the stent is released from the sheath. The released covered stent 200 can be supported by its support components and the cut bare stent 100, so as to achieve close contact between the end of the covered stent 1000 and the blood vessel wall, thereby improving the seal between the end of the covered stent 1000 and the blood vessel wall.

[0117] The above description is merely a preferred embodiment of this application and does not limit the patent scope of this application. Any equivalent structural transformations made based on the content of this application's specification and drawings under the concept of this application, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this application.

Claims

1. A covered stent, characterized in that, This includes the coating, support components, and cutting of the bare support structure; The support component includes a plurality of support coils arranged along a first direction, all of which are disposed on the membrane to support the membrane. The cut bare stent is connected to one end of the membrane. The cut bare stent includes a support portion and an extension portion connected to each other. The support portion is located outside the membrane and is used to abut against and support the inner wall of the blood vessel. The diameter of the support portion gradually increases along the direction away from the extension portion. The extension portion extends along the first direction to the inner side of the end of the membrane, and at least a portion of the extension portion overlaps with the support component. Wherein, the first direction is the direction from the distal end to the proximal end of the covered stent.

2. The covered stent as described in claim 1, characterized in that, The plurality of support wave rings includes a first support wave ring, which is disposed around the inner side of the end of the coating. The first support wave ring includes a plurality of large wave rings and a plurality of small wave rings, with each of the small wave rings connected to the large wave rings on both sides.

3. The stent graft of claim 2, wherein the first and second tubular members are formed from a single piece of material. The support component includes a spring bracket located on the outer side of the end of the film. The spring bracket includes a plurality of spring coils extending along the first direction. The plurality of spring coils are connected to the film and are arranged at intervals along the circumference of the film. The circumference of the spring coils is provided with fibers.

4. The stent graft of claim 2, wherein the graft material is a polymer. The support component includes a filling bag disposed at the end of the film, the filling bag having a filling opening and a support ring disposed on the filling opening, the filling bag being used to fill material through the filling opening to make the filling bag bulge.

5. The stent graft of claim 2, wherein the graft material is a polymer. The support component includes fiber loops disposed on the coating and on the side of the first support loop near its proximal end.

6. The stent of claim 1, wherein The extension includes multiple extension frames for connecting the film, and the support includes multiple support members, each of which is connected between two adjacent extension frames. The support member extends outward in an arc shape along a direction away from the extension portion.

7. The stent of claim 1, wherein The extension frame is provided with an extension bracket on at least one side; and / or, The extension bracket is at least partially overlapped with the support component.

8. The stent of claim 1, wherein The extension frame includes a connecting section and an inner support section. One end of the connecting section is connected to the support member, and the other end is connected to the inner support section. The connecting section is connected to the covering film.

9. The stent graft of claim 8, wherein, The connecting section has a recessed portion that is recessed towards the inside of the cutting bracket, and the inner support section is arranged parallel to the inner wall of the film along the first direction.

10. The covered stent as described in claim 1, characterized in that, The extension frame is integrally connected to the film, and the portion of the extension frame away from the support is inclined towards the inner wall of the film in a direction away from the support; or, The portion of the extension frame away from the support is inclined in a direction away from the support and toward the inner wall of the membrane.

11. The stent graft of claim 2, wherein, The extension frame is provided with barbs on its outer side, and the barbs of the extension frame are located within the wavelet loop; and / or, The barbs of the extension frame are located on the side of the wavelet away from the support.

12. The stent graft of claim 2, wherein, The extension includes multiple extension frames that connect to the coating film. Each of the multiple extension frames corresponds to a multiple of the wavelet loops. The extension frame is at least partially overlapped with the wavelet loop, and the portion of the extension frame located outside the wavelet loop along the first direction is connected and fixed to the coating film.

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