Valve stent and valve prosthesis

Abstract

The invention relates to the technical field of medical instruments, and provides a valve stent and a valve prostheter.The valve stent comprises a supporting body used for being connected with an artificial valve leaflet and at least one abutting branch body set connected with the supporting body, and the abutting branch body set comprises a first abutting branch body and a second abutting branch body which are used for abutting against the same native valve leaflet; the first abutting branch body comprises an extending section which is located on the radial outer side of the supporting main body, has a gap with the supporting main body in the radial direction and has an overlapping area in the axial direction. By means of the technical scheme, the elastic force of the valve stent can be improved, the valve stent can be attached to an original valve ring more easily, and therefore the problem of perivalvular leakage is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of medical devices, and in particular to a valve stent and a valve prosthesis. Background Art

[0002] The transcatheter mitral valve replacement valves that have been publicly researched or marketed mainly use a nickel-titanium alloy cut stent as the skeleton, and the artificial valve leaflets and paravalvular sealing materials are combined with the stent by sewing to form an artificial mitral valve.

[0003] Because the native mitral valve annulus and atrial wall are soft and constantly change with heart pulsation and other reasons, and the left ventricular systolic pressure is relatively high, the stent can easily shift relative to the heart tissue or deform after transplantation and positioning, causing the stent to no longer fit well with the heart tissue. Summary of the invention

[0004] The technical problem to be solved by the present application is to provide a valve stent and a prosthesis that can improve the fit between the valve stent and the heart tissue.

[0005] In order to solve the above technical problems, this application adopts the following technical solutions:

[0006] In the first aspect, the present application provides a valve stent, comprising: a supporting body for connecting an artificial valve leaflet and at least one abutment branch group connected to the supporting body, the abutment branch group comprising a first abutment branch and a second abutment branch for abutting the same native valve leaflet, the first abutment branch comprising an extension section located radially outside the supporting body, having a gap with the supporting body in the radial direction and an overlapping area in the axial direction.

[0007] In the process of implementing the above technical solution, the valve stent includes a support body for connecting the artificial valve leaflet and at least one abutment branch group connected to the support body, the abutment branch group includes a first abutment branch and a second abutment branch for abutting the same native valve leaflet, reducing the fluid mechanics of the native valve leaflet on the artificial valve leaflet, reducing the impact on the left ventricular outflow tract, and reducing the risk of left ventricular outflow tract obstruction; at the same time, the first abutment branch includes an extension section located radially outside the support body, having a gap with the support body in the radial direction and having an overlapping area in the axial direction, so that the extension section on the periphery of the valve stent can have a deformation space in the direction of the support body, which is conducive to absorbing the deformation caused by the heart pulsation, thereby improving the stability and fit of the support body. The extension section has an overlapping area with the support body in the axial direction, which can increase the fitting area of ​​the extension section and the heart tissue, and also increase the elastic force of the extension section, so that the valve stent is easier to fit with the heart tissue.

[0008] As an embodiment, the first abutment branch includes two first connecting sections respectively connected to the support body, two radial extension sections radially extending from the first connecting sections relative to the support body, the extension sections respectively extending upward from the radial extension sections, and a protruding section connecting the vertices of the two extension sections.

[0009] In the process of implementing the above technical scheme, the first abutting branch includes two first connecting sections respectively connected to the supporting body and two radial extension sections radially extending from the first connecting sections relative to the supporting body, extension sections respectively extending upward from the radial extension sections, and a protruding section connecting the vertices of the two extension sections, so that the first abutting branch constitutes a frame structure to improve the clamping force of clamping the native leaflet and the stability of the structure; at the same time, because the first abutting branch includes the radial extension section, a gap is formed between the extension section and the first connecting section, and a gap is further formed between the extension section and the supporting body, thereby increasing the elastic force of the valve stent.

[0010] As an embodiment, the apex position of the extension section exceeds the middle portion of the support body.

[0011] In the process of implementing the above technical solution, the apex position of the extension section exceeds the middle part of the supporting body, so that the axial length of the extension section can be increased as much as possible. On the one hand, it can increase the fitting area with the heart tissue, and on the other hand, it can also increase the elastic force of the extension section.

[0012] As an embodiment, the apex of the extension segment exceeds the protruding segment for abutting one side of the native leaflet.

[0013] In the process of implementing the above technical solution, since the protruding section needs to abut against one side of the native leaflet, the protruding section needs to have a certain height in the axial direction, and the apex of the extension section exceeds the protruding section used to abut against one side of the native leaflet, thereby increasing the axial length of the extension section and also increasing the elastic supporting force of the extension section on the protruding section, so that the first abutting branch can easily fit against the heart tissue.

[0014] As an embodiment, the protruding section includes two protruding sub-segments extending obliquely to each other and a horizontal first abutting section, two ends of the first abutting section are respectively connected to the two protruding sub-segments, one end of the extension section is connected to the protruding sub-segment, and the other end is connected to the radial extension section, or;

[0015] The protruding section comprises two protruding sub-sections extending obliquely to each other, one end of the extending section is connected to the protruding sub-section, and the other end is connected to the radial extending section.

[0016] In the process of implementing the above technical solution, the protruding section includes two protruding sub-sections extending obliquely to each other and a horizontal first abutting section, and the horizontally arranged first abutting section can increase the abutting area between the protruding section and the native leaflet to improve the clamping force of the first abutting branch, or;

[0017] The protruding section includes two protruding sub-segments extending obliquely to each other, one end of the extension section is connected to the protruding sub-segment, and the other end is connected to the radial extension section, so that the two protruding sub-segments form an abutment point, which cooperates with the second abutment branch to clamp the same native leaflet, while also reducing the recovery resistance of the valve stent.

[0018] As an embodiment, the second abutment branch extends toward the radial outer side of the support body, including two second connecting segments extending obliquely toward each other and a horizontal second abutment segment, and the two ends of the second abutment segment are respectively connected to the two second connecting segments, or; the second abutment branch extends toward the radial outer side of the support body, including two second connecting segments extending obliquely toward each other, one ends of the two second connecting segments are connected to each other, and the other ends are respectively connected to the support body.

[0019] In the process of implementing the above technical scheme, the second abutment branch extends toward the radially outer side of the support body, including two second connecting segments extending obliquely toward each other and a horizontal second abutment segment. The two ends of the second abutment segment are respectively connected to the two second connecting segments. By setting the horizontal second abutment segment, the contact area with the native leaflet can be increased, thereby improving the stability between the second abutment branch and the native leaflet; or, the second abutment branch has two second connecting segments extending obliquely toward each other, one end of the two second connecting segments is connected to each other, and the other end is respectively connected to the support body, so that the two second connecting segments form an abutment point, which cooperates with the first abutment branch to clamp the same native leaflet, and at the same time, the recovery resistance of the valve stent is reduced.

[0020] As an embodiment, a distance that the second abutting branch extends outward along the supporting body is greater than a distance that the first abutting branch extends outward along the supporting body.

[0021] In the process of implementing the above technical scheme, the distance that the second abutment branch extends outward along the support body is greater than the distance that the first abutment branch extends outward along the support body, so that the second abutment branch can support one side of the native leaflet, which is convenient for the first abutment branch and the second abutment branch to clamp the native leaflet; at the same time, since the protruding sub-segment is inclined radially outward relative to the extension segment, the distance that the second abutment branch extends outward is greater than that of the first abutment branch, so that the confluence position of the second abutment segment of the second abutment branch or the two second connecting segments can correspond to the confluence position of the first abutment segment of the first abutment branch or the two protruding sub-segments, so as to better clamp the native leaflet.

[0022] As an embodiment, the support body includes a plurality of support units, which enclose a channel for blood flow; wherein each of the support units includes two first support bodies for respectively connecting different artificial valve leaflets, and the vertical projections of the plurality of first support bodies are on a circle of the same radius.

[0023] In the process of implementing the above technical solution, the support body includes multiple support units, and the multiple support units enclose a channel for blood flow; wherein each support unit includes two first support bodies for respectively connecting different artificial valve leaflets, and the vertical projections of the multiple first support bodies are on a circle of the same radius, which can facilitate the connection of multiple support units with the artificial valve leaflets and make the opening of the artificial valve leaflets larger.

[0024] As an embodiment, the valve stent includes a plurality of second support bodies respectively connected to two first support bodies in the same support unit, and a space that can be connected and covered by a sealing layer is formed between the two first support bodies in the same support unit and the second support bodies; the second support body is located in the upstream direction of the first support body; the two first support bodies in the same support unit respectively extend from both ends of the second support body to the downstream direction, and the two first support bodies converge and connect.

[0025] In the process of implementing the above technical scheme, the valve stent includes a plurality of second support bodies respectively connected to the two first support bodies in the same support unit, and a space that can be connected and covered by a sealing layer is formed between the two first support bodies and the second support bodies in the same support unit. In this way, when the sealing layer is respectively connected to the second support body and the two first support bodies, the sealing layer covers the space, thereby enhancing the sealing of the valve periphery of the valve stent and reducing the problem of paravalvular leakage; the second support body is located in the upstream direction of the first support body, so that the second support body can be anchored on the atrial side to improve the stability between the valve stent and the heart tissue; the two first support bodies in the same support unit respectively extend from the two ends of the second support body to the downstream direction, and the two first support bodies converge and are connected, so that the two first support bodies in the same support unit gradually narrow toward the downstream direction, which is convenient for connection with the artificial valve leaflets.

[0026] As an embodiment, the second support body includes two transition connection segments and an anchoring segment, both ends of the anchoring segment are respectively connected to one end of the two transition connection segments, and the other end of the transition connection segment is connected to the first support body, and the transition connection segment and the anchoring segment are arranged at an angle; the anchoring segment includes a protruding segment protruding outward along the radial direction of the support body for connecting to a conveying device.

[0027] In the process of implementing the above technical scheme, the second support body includes two transition connection segments and an anchoring segment. The two ends of the anchoring segment are respectively connected to one end of the two transition connection segments, and the other end of the transition connection segment is connected to the first support body, so that the two transition connection segments and the anchoring segment surround a frame structure, which can perform an anchoring function on the atrial side and improve the stability between the valve stent and the heart tissue; at the same time, the transition connection segment and the anchoring segment are set at an angle, so that the valve stent is easier to fit with the atrial side; and the anchoring segment also includes a protruding segment protruding outward along the radial direction of the support body for connecting to a conveying device. On the one hand, it can realize the anchoring function, and on the other hand, it can also realize the connection with the conveying device, so that the conveying device can conveniently convey the valve stent.

[0028] As an implementation manner, one end of two first supporting bodies in the same supporting unit is connected to one end of two adjacent second abutting supporting bodies through a first connecting member; one end of two adjacent first abutting supporting bodies is connected through a first connecting member.

[0029] In the process of implementing the above technical solution, the first connecting member can connect the two first support bodies and the two adjacent second abutting branches in the same support unit, thereby improving the stability of the valve stent; at the same time, the first connecting member can also connect the two adjacent first abutting branches, thereby realizing the structural compactness of the valve stent.

[0030] In the second aspect, the present application provides a valve stent, comprising: a supporting body for connecting an artificial valve leaflet and a plurality of abutment branch groups connected to the supporting body, the abutment branch groups comprising a first abutment branch and a second abutment branch for abutting the same native valve leaflet, a accommodating space being formed between the plurality of abutment branch groups, the supporting body being located in the accommodating space, and the first abutment branch having a deformation space in the radial direction.

[0031] In the process of implementing the above technical scheme, the valve stent includes a supporting body for connecting the artificial valve leaflet and a plurality of abutment branch groups connected to the supporting body, each abutment branch group includes clamping the same native valve leaflet, reducing the influence of the native valve leaflet on the fluid mechanics of the artificial valve leaflet, reducing the influence on the left ventricular outflow tract, and reducing the risk of left ventricular outflow tract obstruction; a accommodating space is formed between the plurality of abutment branch groups, and the supporting body is located in the accommodating space, so that there is a gap between the supporting body and the abutment branch group, the abutment branch group includes a first abutment branch and a second abutment branch, and the first abutment branch has a deformation space in the radial direction, thereby increasing the overall elasticity of the valve stent, making the valve stent easier to fit the heart tissue and reducing the problem of paravalvular leakage.

[0032] As an embodiment, the abutment branch group extends radially outward toward the support body, and the support body contacts the heart tissue through the abutment branch group.

[0033] During the implementation of the above technical solution, the abutment branch group extends radially outward toward the support body, and the support body contacts the heart tissue through the abutment branch group, so that the support body does not directly contact the heart tissue. The abutment branch group is equivalent to separating the heart tissue from the support body. The abutment branch group reduces the influence of the native leaflets on the artificial leaflets on the support body, thereby increasing the service life of the valve stent.

[0034] In a third aspect, the present application provides a valve prosthesis, comprising the valve stent provided in the first aspect or the second aspect, an artificial valve leaflet connected to a first support body; and a sealing layer connected to two first support bodies and a second support body in the same support unit.

[0035] In the process of implementing the above technical solution, the artificial valve leaflet is a tri-leaflet valve, which replaces the opening and closing actions of the native mitral valve leaflet. The sealing layer is connected to the two first support bodies and the second support body in the same support unit, and can be used to seal the gap of the valve stent to enhance the paravalvular sealing. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments of the present application will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0037] Figure 1 A schematic diagram of the structure of a valve prosthesis provided in an embodiment of the present application;

[0038] Figure 2 Schematic diagram of the structure of the valve prosthesis provided in the embodiment of the present application from different perspectives;

[0039] Figure 3 A schematic diagram of the structure of a valve prosthesis provided in different embodiments of the present application;

[0040] Figure 4 A schematic structural diagram of a valve prosthesis from another perspective provided in an embodiment of the present application;

[0041] Figure 5 This is a schematic diagram of the structure of the valve prosthesis provided in an embodiment of the present application implanted into heart tissue.

[0042] Icon: 1-support body; 11-first support body; 12-second support body; 121-transition connection section; 122-anchoring section; 1221-protruding section; 2-abutting branch group; 21-first abutting branch; 211-protruding section; 2111-protruding sub-section; 212-extension section; 213-first abutting section; 214-first connecting section; 215-radial extension section; 22-second abutting branch; 221-second connecting section; 222-second abutting section; 3-first connecting member; 4-second connecting member; 5-artificial valve leaflet; 6-sealing layer. DETAILED DESCRIPTION

[0043] The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application.

[0044] It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings. At the same time, in the description of this application, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0045] On the first aspect, an embodiment of the present application provides a valve stent, which has a simple structure and uses nickel-titanium wire as raw material, which can reduce production costs and improve safety; at the same time, the valve stent of the embodiment of the present application has good elastic deformation force and can better fit with heart tissue to reduce the problem of paravalvular leakage.

[0046] like Figure 1 and 5 As shown, the valve stent includes: a support body 1 for connecting an artificial valve leaflet 5 and at least one abutment branch group 2 connected to the support body 1, the abutment branch group 2 includes a first abutment branch 21 and a second abutment branch 22 for abutting the same native valve leaflet. By setting the abutment branch group 2, the fluid mechanics of the native valve leaflet on the artificial valve leaflet 5 can be reduced, and the impact on the left ventricular outflow tract can also be reduced, thereby reducing the risk of left ventricular outflow tract obstruction; the first abutment branch 21 includes an extension section 212 located radially outside the support body 1, having a gap with the support body 1 in the radial direction and an overlapping area in the axial direction, so that the extension section 212 on the periphery of the valve stent can have a deformation space toward the direction of the support body 1, thereby increasing the overall elastic force of the valve stent, and when the outer extension section 212 is subjected to a force in the radial direction, the extension section 212 can deform inward or outward along the radial direction, thereby facilitating the absorption of the deformation caused by the heart pulsation, thereby improving the stability and fit of the support body 1. The extension section 212 has an overlapping area with the support body 1 in the axial direction, which can increase the fitting area between the extension section 212 and the heart tissue, making it easier for the valve stent to fit the heart tissue and reducing the problem of paravalvular leakage.

[0047] Optionally, the extension section 212 has an axially overlapping area with the support body 1 in the axial direction, which means that the extension section 212 extends in the axial direction of the valve stent, and the projection of the extension section 212 in the direction of the support body 1 is projected onto the support body 1, which will cause the projection of the portion of the extension section 212 projected on the support body 1 to partially overlap with the support body 1.

[0048] Optionally, the valve stent is provided with three abutment branch groups 2 so as to be able to clamp the native leaflet from multiple directions.

[0049] Optionally, the support body 1 and the abutment branch group 2 can be made of nickel-titanium wire, which can reduce the production cost of the valve stent yoke and improve the safety of the valve stent compared to the nickel-titanium tube in the prior art.

[0050] Optionally, the first abutting branch 21 is used to abut against the inner side of the native valve leaflet, and the second abutting branch 22 is used to abut against the outer side of the native valve leaflet.

[0051] like Figure 1As shown, as an embodiment, the first abutting branch 21 includes two first connecting segments 214 respectively connected to the support body 1 and two radial extension segments 215 radially extending from the first connecting segments 214 relative to the support body 1, extension segments 212 respectively extending upward from the radial extension segments 215, and a protruding segment 211 connecting the vertices of the two extension segments 212, so that the first abutting branch 21 constitutes a frame structure to improve the clamping force of clamping the native leaflet and the stability of the structure; at the same time, because the first abutting branch 21 includes the radial extension segment 215, a gap is formed between the extension segment 212 and the first connecting segment 214, and a gap is further formed between the extension segment 212 and the support body 1, thereby increasing the elastic force of the valve stent.

[0052] like Figure 1 As shown, as an embodiment, the apex position of the extension section 212 exceeds the middle of the support body 1, so that the axial length of the extension section 212 is increased as much as possible, which can increase the fitting area with the heart tissue on one hand, and also increase the elastic force of the extension section 212 on the other hand.

[0053] like Figure 1 As shown, as an embodiment, the apex of the extension segment 212 exceeds the protruding segment 211 for abutting one side of the native leaflet. Since the protruding segment 211 needs to abut one side of the native leaflet, the protruding segment 211 needs to have a certain height in the axial direction. The apex of the extension segment 212 exceeds the protruding segment 211 for abutting one side of the native leaflet, thereby increasing the axial length of the extension segment 212 and also increasing the elastic supporting force of the extension segment 212 on the protruding segment 211, so that the first abutting branch 21 is easy to fit with the heart tissue.

[0054] like Figure 3 As shown, as an embodiment, the protruding section 211 includes two protruding sub-segments 2111 extending obliquely to each other and a horizontal first abutting section 213, both ends of the first abutting section 213 are respectively connected to the two protruding sub-segments 2111, one end of the extension section 212 is connected to the protruding sub-segment 2111, and the other end is connected to the radial extension section 215. The horizontally arranged first abutting section 213 can increase the abutting area between the protruding section 211 and the native leaflet to improve the clamping force of the first abutting branch 21.

[0055] like Figure 2 As shown, as a parallel embodiment, the protruding section 211 includes two protruding sub-segments 2111 extending obliquely to each other, one end of the extension section 212 is connected to the protruding sub-segment 2111, and the other end is connected to the radial extension section 215, so that the two protruding sub-segments 2111 form an abutment point, which cooperates with the second abutment branch 22 to clamp the same native leaflet, while also reducing the recovery resistance of the valve stent.

[0056] like Figure 1 As shown, as an embodiment, the second abutment branch 22 extends toward the radially outer side of the support body 1, and includes two second connecting segments 221 extending obliquely toward each other and a horizontal second abutment segment 222. The two ends of the second abutment segment 222 are respectively connected to the two second connecting segments 221. By setting the horizontal second abutment segment 222, the contact area with the native leaflet can be increased, thereby improving the stability between the second abutment branch 22 and the native leaflet.

[0057] As a parallel embodiment, the second abutment branch 22 extends radially outward from the support body 1, and includes two second connecting segments 221 extending obliquely toward each other. One ends of the two second connecting segments 221 are connected to each other, and the other ends are respectively connected to the support body 1, so that the two second connecting segments 221 form an abutment point, which cooperates with the first abutment branch 21 to clamp the same native leaflet, and at the same time, reduces the recovery resistance of the valve stent.

[0058] As an embodiment, the distance that the second abutment branch 22 extends outward along the support body 1 is greater than the distance that the first abutment branch 21 extends outward along the support body 1, so that the second abutment branch 22 can support one side of the native leaflet, which is convenient for the first abutment branch 21 and the second abutment branch 22 to clamp the native leaflet; at the same time, since the protruding sub-segment 2111 is radially inclined outward relative to the extension segment 212, the distance that the second abutment branch 22 extends outward is greater than that of the first abutment branch 21, so that the confluence position of the second abutment segment 222 of the second abutment branch 22 or the two second connecting segments 221 can correspond to the confluence position of the first abutment segment 213 of the first abutment branch 21 or the two protruding sub-segments 2111, so as to better clamp the native leaflet.

[0059] As an embodiment, the support body 1 includes a plurality of support units, and the plurality of support units enclose a channel for blood flow; wherein each support unit includes two first support bodies 11 for respectively connecting different artificial valve leaflets 5, and the vertical projections of the plurality of first support bodies 11 are on a circle of the same radius, so that it is convenient to connect the plurality of support units to the artificial valve leaflets 5, thereby enlarging the opening of the artificial valve leaflets 5; at the same time, it can also improve the coating efficiency and yield.

[0060] like Figure 1As shown, as an embodiment, the valve stent includes a plurality of second support bodies 12 respectively connected to two first support bodies 11 in the same support unit, and a space that can be connected and covered by a sealing layer 6 is formed between the two first support bodies 11 and the second support body 12 in the same support unit. In this way, when the sealing layer 6 is respectively connected to the second support body 12 and the two first support bodies 11, the sealing of the valve periphery of the valve stent can be enhanced through the covering space of the sealing layer 6, thereby reducing the problem of paravalvular leakage; the second support body 12 is located in the upstream direction of the first support body 11, so that the second support body 12 can be anchored on the atrial side to improve the stability between the valve stent and the heart tissue; the two first support bodies 11 in the same support unit respectively extend from the two ends of the second support body 12 to the downstream direction, and the two first support bodies 11 are merged and connected, so that the two first support bodies 11 in the same support unit gradually narrow toward the downstream direction, which is convenient for connection with the artificial valve leaflet 5.

[0061] Optionally, the upstream direction is the blood inflow end.

[0062] like Figure 1 , 2 As shown in Figure 4, as an embodiment, the second support body 12 includes two transition connection segments 121 and an anchoring segment 122, and the two ends of the anchoring segment 122 are respectively connected to one end of the two transition connection segments 121, and the other end of the transition connection segment 121 is connected to the first support body 11, so that the two transition connection segments 121 and the anchoring segment 122 surround a frame structure, which can perform an anchoring function on the atrial side and improve the stability between the valve stent and the heart tissue; at the same time, the transition connection segment 121 and the anchoring segment 122 are arranged at an angle, so that the valve stent is easier to fit with the atrial side; and the anchoring segment 122 also includes a protruding segment 1221 protruding outward along the radial direction of the support body 1 for connecting to a conveying device, which can realize the anchoring function on the one hand, and can also realize the connection with the conveying device on the other hand, so that the conveying device can facilitate the conveying of the valve stent.

[0063] like Figure 2 and 5 As shown, as an embodiment, the valve stent also includes multiple first connecting members 3, and the first connecting members 3 can connect two first support bodies 11 and two adjacent second abutting branches 22 in the same support unit, which can improve the stability of the valve stent; at the same time, the first connecting member 3 can also connect two adjacent first abutting branches 21, which can achieve the structural compactness of the valve stent.

[0064] Optionally, two first support bodies 11 and two adjacent second abutment branches 22 in the same support unit are arranged in parallel and connected by a first connecting member 3, so that the valve stent can reduce the radially occupied volume in the contracted state.

[0065] like Figure 2 As shown, optionally, the valve stent includes multiple second connecting members 4, and two adjacent first support bodies 11 in two adjacent support units are connected in parallel to one side of the second connecting member 4; two adjacent second support bodies 12 are connected in parallel to the other side of the second connecting member 4, thereby improving the structural compactness of the valve stent and at the same time being able to reduce the volume occupied by the valve stent in the radial direction when the valve stent is in a contracted state, thereby facilitating delivery by the delivery device.

[0066] Optionally, the first abutting branch 21 and the second abutting branch 22 use at least one metal wire. When the valve stent is formed by weaving a longitudinal material, the valve stent has a high integrity and is easy to process and form. When the valve stent is made of multiple longitudinal materials, the two connected longitudinal materials can be fixedly connected by riveting or welding. In addition, the connection between the two connected longitudinal materials can also be fixedly connected by welding or threaded connection.

[0067] like Figure 1 As shown, in the second aspect, the present application provides a valve stent, which includes a supporting body 1 for connecting an artificial valve leaflet and a plurality of abutting branch groups 2 connected to the supporting body 1, each abutting branch group 2 includes clamping the same native valve leaflet, reducing the fluid mechanics influence of the native valve leaflet on the artificial valve leaflet 5, which can reduce the influence on the left ventricular outflow tract and reduce the risk of left ventricular outflow tract obstruction; an accommodating space is formed between the plurality of abutting branch groups 2, and the supporting body 1 is located in the accommodating space, so that there is a gap between the supporting body 1 and the abutting branch group 2, and the abutting branch group 2 includes a first abutting branch 21 and a second abutting branch 22, and the first abutting branch 21 has a deformation space in the radial direction, thereby increasing the overall elasticity of the valve stent, making the valve stent easier to fit with the heart tissue and reducing the problem of paravalvular leakage.

[0068] As an embodiment, the abutment branch group 2 extends radially outward toward the support body 1, and the support body 1 contacts the heart tissue through the abutment branch group 2, so that the support body 1 does not directly contact the heart tissue. The abutment branch group 2 is equivalent to separating the heart tissue from the support body 1, and the abutment branch group 2 reduces the influence of the native valve leaflet on the artificial valve leaflet 5 on the support body 1, thereby improving the service life of the valve stent.

[0069] like Figure 1 , 4As shown in Figure 5, in a third aspect, the present application provides a valve prosthesis, including the valve stent provided in the first aspect or the second aspect, an artificial valve leaflet 5 connected to the first support body 11; and a sealing layer 6 connected to the two first support bodies 11 and the second support body 12 in the same support unit. The artificial valve leaflet 5 is a tri-leaflet valve, which replaces the opening and closing action of the native mitral valve leaflet. The sealing layer 6 is connected to the two first support bodies 11 and the second support body 12 in the same support unit, and can be used to seal the gap of the valve stent to enhance the sealing performance around the valve.

[0070] Optionally, the artificial valve leaflet 5 can be connected to the first support body 11 by means of covering or suturing.

[0071] The above description is only an embodiment of the present application and is not intended to limit the scope of protection of the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the scope of protection of the present application.

[0072] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

[0073] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

Claims

1. A valve stent, characterized in that: include: A support body for connecting an artificial valve leaflet and at least one abutment branch group connected to the support body, the abutment branch group including a first abutment branch and a second abutment branch for abutting the same native valve leaflet, the first abutment branch including an extension section located radially outside the support body, having a gap with the support body in the radial direction and an overlapping area in the axial direction.

2. The valve stent according to claim 1, characterized in that: The first abutment branch includes two first connecting sections respectively connected to the support body, two radial extension sections radially extending from the first connecting sections relative to the support body, the extension sections respectively extending upward from the radial extension sections, and a protruding section connecting the vertices of the two extension sections.

3. The valve stent according to claim 1 or 2, characterized in that: The apex position of the extension section exceeds the middle portion of the support body.

4. The valve stent according to claim 2, characterized in that: The apex of the extension section exceeds the protruding section for abutting against one side of the native leaflet.

5. The valve stent according to claim 2, characterized in that: The protruding section includes two protruding sub-sections extending obliquely to each other and a horizontal first abutting section, two ends of the first abutting section are respectively connected to the two protruding sub-sections, one end of the extending section is connected to the protruding sub-section, and the other end is connected to the radial extending section, or; The protruding section comprises two protruding sub-sections extending obliquely to each other, one end of the extending section is connected to the protruding sub-section, and the other end is connected to the radial extending section.

6. The valve stent according to claim 1 or 2, characterized in that: The second abutting branch extends toward the radial outer side of the supporting body, and includes two second connecting sections extending obliquely toward each other and a horizontal second abutting section, and two ends of the second abutting section are respectively connected to the two second connecting sections, or; The second abutting branch extends toward the radial outer side of the supporting body, and includes two second connecting segments extending obliquely toward each other, one ends of the two second connecting segments are connected to each other, and the other ends are respectively connected to the supporting body.

7. The valve stent according to claim 1 or 2, characterized in that: The distance that the second abutting branch extends outward along the supporting body is greater than the distance that the first abutting branch extends outward along the supporting body.

8. The valve stent according to claim 1 or 2, characterized in that: The support body includes a plurality of support units, and the plurality of support units surround a channel for blood flow; Wherein, each of the support units includes two first support bodies for respectively connecting different artificial valve leaflets, and the vertical projections of the plurality of first support bodies are on a circle with the same radius.

9. The valve stent according to claim 8, characterized in that: The valve stent comprises a plurality of second support bodies respectively connected to two first support bodies in the same support unit, and a space which can be connected and covered by a sealing layer is formed between the two first support bodies in the same support unit and the second support bodies; The second support body is located in the upstream direction of the first support body; The two first support bodies in the same support unit extend from two ends of the second support body toward the downstream direction respectively, and the two first support bodies are joined and connected.

10. The valve stent according to claim 9, characterized in that: The second support body comprises two transition connection segments and an anchoring segment, two ends of the anchoring segment are respectively connected to one end of the two transition connection segments, the other end of the transition connection segment is connected to the first support body, and the transition connection segment and the anchoring segment are arranged at an angle; The anchoring section includes a protruding section protruding outwardly in a radial direction of the supporting body and used for connecting with a conveying device.

11. The valve stent according to claim 8, characterized in that: One end of two first supporting bodies in the same supporting unit is connected to one end of two adjacent second abutting supporting bodies through a first connecting member; One ends of two adjacent first abutting supports are connected via a first connecting member.

12. A valve stent, characterized in that: It includes a supporting body for connecting an artificial valve leaflet and a plurality of abutment branch groups connected to the supporting body, the abutment branch groups include a first abutment branch and a second abutment branch for abutting the same native valve leaflet, a accommodating space is formed between the plurality of abutment branch groups, the supporting body is located in the accommodating space, and the first abutment branch has a deformation space in the radial direction.

13. The valve stent according to claim 12, characterized in that: The abutment branch group extends radially outward from the support body, and the support body contacts the heart tissue through the abutment branch group.

14. A valve prosthesis, characterized in that: A valve stent comprising any one of claims 1 to 13; An artificial valve leaflet connected to the first support body; The sealing layer is connected to the two first supporting bodies and the second supporting body in the same supporting unit.

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