A prosthetic valve

Abstract

The utility model relates to a kind of artificial valve, the artificial valve includes valve frame, valve leaflet;The valve leaflet is arranged in the valve frame;The valve frame includes multiple double-grid structures, the double-grid structure includes first grid unit and second grid unit being adjacent in the circumferential direction or axial direction of the valve frame;Wherein one double-grid structure and adjacent another double-grid structure circumferential dislocation, axial interface.It is prevented that the valve frame is expanded in axial and / or circumferential direction instantaneously by the above-mentioned setting when the valve frame is inflated and expanded by balloon, so that the double-grid structure is mutually restrained in the axial and / or circumferential direction of the valve frame, to avoid the distortion of the strut of the valve frame when balloon inflation and expansion reach initial critical pressure.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, and in particular to an artificial valve. Background Technology

[0002] In existing technologies, artificial valves include a valve frame and a valve, with the valve frame comprising multiple struts. During replacement surgery, because the outer diameter of the valve frame in its natural state is relatively large, it is not conducive to delivery. Therefore, it is necessary to first compress the valve frame to cause the artificial valve to contract radially, and then deliver it to the aortic, mitral, or tricuspid valve position via a catheter. Then, components such as a balloon catheter are used to dilate it and restore it to its natural state, thereby completing the valve replacement surgery.

[0003] Once the balloon is inflated to a certain pressure, the valve frame may be rapidly expanded by the balloon at the moment it begins to expand from the contracted state. This could cause the strut to twist and deform due to excessive expansion, leading to the failure of the artificial valve. Utility Model Content

[0004] To solve the above-mentioned technical problems, this utility model provides an artificial valve, which includes a valve frame and leaflets; the leaflets are disposed in the valve frame; the valve frame includes multiple double-grid structures, each double-grid structure including a first grid unit and a second grid unit arranged adjacent to each other in the circumferential or axial direction of the valve frame, wherein at least three vertices of the first grid unit and the second grid are located on the same straight line in the circumferential or axial direction of the valve frame; one of the double-grid structures is circumferentially misaligned with the other adjacent double-grid structure but axially connected.

[0005] In some possible embodiments, the straight line is parallel to the circumferential or axial direction of the flap.

[0006] In some possible embodiments, the petal frame is a split structure, and the double-grid structure 8 is provided with multiple through holes. The petal frame is formed by splicing and assembling multiple double-grid structures that are evenly distributed in the circumferential and / or axial directions.

[0007] In some possible embodiments, the flap frame includes multiple layers of wave bars, each layer of wave bars including multiple interconnected support rods, and the intersection of two adjacent support rods forms a node; in the natural state and the contracted state, the multiple nodes of the same layer are flush with each other in the circumferential direction of the flap frame.

[0008] In some possible embodiments, the petal frame has multiple layers of mesh, each layer of the mesh including a plurality of first mesh units or second mesh units; the petal frame has at least three first mesh units or second mesh units evenly distributed in the circumferential direction.

[0009] In some possible embodiments, the first grid cell or the second grid cell consists of at least four of the aforementioned struts.

[0010] In some possible embodiments, the valve frame further has an end, an outflow end, and an inflow end, the end being formed by the intersection of two adjacent support rods near the outflow end or the inflow end; the end is generally U-shaped, the end including two sides, each side including a first curved segment and a second curved segment, wherein one end of the first curved segment is connected to the first support rod, the other end of the first curved segment is connected to one end of the second curved segment, and the other end of the second curved segment is connected to the other end of another second curved segment.

[0011] In some possible embodiments, the first curved segment has a central angle α, and the second curved segment has a central angle b; in the natural state, the central angle α is greater than the central angle b.

[0012] In some possible embodiments, in the natural state, the width of the first grid cell or the second grid cell in the circumferential direction is W1; in the contracted state, the width of the first grid cell or the second grid cell in the circumferential direction is W2; wherein the width W1 is 3-20 times the width W2.

[0013] In some possible embodiments, when the petal frame is compressed in the contracted state, the grid cell is flat and elongated, wherein the radius of the arc segment at the end of the petal frame is r, and the distance between two adjacent nodes at the end is W2, where W2 is greater than 2×r.

[0014] With the above configuration, the double-grid structure can deform at the corresponding node positions during the compression or expansion of the valve frame, thus preventing the support rod from twisting and deforming. One of the double-grid structures and the adjacent double-grid structure are circumferentially misaligned and axially connected, so that when the valve frame is inflated by the balloon, the double-grid structures restrain each other in the axial and / or circumferential directions of the valve frame, thereby preventing the valve frame from being rapidly expanded instantaneously in the axial and / or circumferential directions when the balloon inflates and expands to the initial critical pressure, thus avoiding the twisting and deformation of the valve frame support rod. Furthermore, by setting multiple nodes to be flush in the circumferential direction, the nodes remain flush regardless of whether the petal frame is in its natural or contracted state. Therefore, during the compression process (i.e., when the petal frame transitions from its natural to its contracted state), all nodes of the petal frame move radially in sync with the movement of the support rod, causing the corresponding grid cells to contract uniformly inward. Simultaneously, both ends of the petal frame (i.e., the inflow end and the outflow end) move outward synchronously along the axial direction of the petal frame. Specifically, the end located at the outflow end moves along the "inflow end - outflow end" direction, and the end located at the inflow end moves along the "outflow end - inflow end" direction. This results in radial contraction and axial expansion of the petal frame, thereby reducing the risk of the support rod twisting and deforming due to uneven force during petal frame compression loading and ensuring that the petal frame can be uniformly compressed and loaded. During the expansion process (i.e., the petal frame transitions from a contracted state to a natural state), all nodes of the petal frame move radially in sync with the movement of the support rod, causing the corresponding grid cells to expand outwards uniformly. Simultaneously, both ends of the petal frame (i.e., the inflow end and the outflow end) move inwards sync along the axial direction of the petal frame. Specifically, the end located at the outflow end moves along the "outflow-inflow" direction, and the end located at the inflow end moves along the "inflow-outflow" direction. This results in radial expansion and axial contraction of the petal frame, thereby reducing the risk of the support rod twisting and deforming due to uneven stress during expansion and ensuring that the petal frame can expand uniformly. Attached Figure Description

[0015] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with the present invention and, together with the description, serve to explain the principles of the present invention.

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the structure of the artificial valve of this utility model;

[0018] Figure 2 for Figure 1 A schematic diagram of the valve arch in its natural state;

[0019] Figure 3 for Figure 2 A schematic diagram of the unfolded petiole structure;

[0020] Figure 4 for Figure 1 A schematic diagram of the valve arch in a contracted state;

[0021] Figure 5 for Figure 4 A schematic diagram of the unfolded petiole structure;

[0022] Figure 6 for Figure 1 A schematic diagram of an artificial valve implanted into the aortic ring;

[0023] Figure 7 A schematic diagram of the end portion of another embodiment;

[0024] Figure 8 A schematic diagram of a valve frame according to another embodiment;

[0025] Figure 9 A schematic diagram of a valve frame according to yet another embodiment;

[0026] Figure 10 A schematic diagram of a valve frame according to another embodiment;

[0027] Figure 11 This is a schematic diagram of a dual-grid structure;

[0028] Figure 12 This is a schematic diagram of another type of dual-grid structure;

[0029] Figure 13 A schematic diagram of a petiole frame with a double-grid structure;

[0030] Figure 14 This is a schematic diagram of a split-type dual-grid structure;

[0031] Figure 15 A schematic diagram of a petiole frame with a split double-grid structure;

[0032] Figure 16 A schematic diagram of another type of petiole frame with a split double-grid structure;

[0033] Figure 17 This is a schematic diagram of another type of petiole frame with a double-grid structure;

[0034] Figure 18 This is a schematic diagram of another type of petiole frame with a double-grid structure. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0036] In the field of medical devices, "proximal" refers to the end closer to the operator, while "distal" refers to the end farther from the operator. "Axial" refers to the direction parallel to the line connecting the center of the distal and proximal ends of the medical device; "radial" refers to the direction along the diameter or radius; and "circumferential" refers to the circumferential direction. Those skilled in the art can understand the specific meaning of these terms in this utility model based on the actual situation.

[0037] This invention provides an artificial valve, which includes a valve frame and valve leaflets; the valve leaflets are disposed in the valve frame; the valve frame includes multiple layers of wave rods, each layer of wave rods includes multiple interconnected support rods, and the intersecting portions of two adjacent support rods form nodes; in the natural state and the contracted state, the multiple nodes of the same layer are flush with each other in the circumferential direction of the valve frame.

[0038] With the above settings, the multiple nodes are aligned circumferentially. Regardless of whether the petiole frame is in its natural or contracted state, the multiple nodes remain aligned circumferentially. Therefore, during the compression process (i.e., when the petiole frame changes from its natural state to its contracted state), all nodes of the petiole frame will synchronously and uniformly contract inward along the radial direction, and the two ends of the petiole frame (i.e., the inflow end and the outflow end) will synchronously move outward along the axial direction of the petiole frame. That is, the end located at the outflow end moves along the direction of "inflow end - outflow end", and the end located at the inflow end moves along the direction of "outflow end - inflow end", thereby forming the radial contraction and axial expansion of the petiole frame. This reduces the risk of the support rod twisting and deforming due to uneven force when the petiole frame is compressed and loaded, and ensures that the petiole frame can be uniformly compressed and loaded.

[0039] During the expansion process (i.e., the petal frame transitions from a contracted state to a natural state), all nodes of the petal frame move radially in sync with the movement of the support rod, causing the corresponding grid cells to expand outwards uniformly. Simultaneously, both ends of the petal frame (i.e., the inflow end and the outflow end) move inwards sync along the axial direction of the petal frame. Specifically, the end located at the outflow end moves along the "outflow-inflow" direction, and the end located at the inflow end moves along the "inflow-outflow" direction. This results in radial expansion and axial contraction of the petal frame, thereby reducing the risk of the support rod twisting and deforming due to uneven stress during expansion and ensuring that the petal frame can expand uniformly.

[0040] Specifically, such as Figures 1-5 As shown, the artificial valve 1 includes a valve frame 2 ( Figure 2 With the valgus frame 2 in its natural state, Figure 4 (With the petal frame 2 in a contracted state), the petal frame 2 includes multiple first support rods 211 and second support rods 213. Multiple first support rods 211 in the same layer form a wave bar. The vertically arranged second support rods 213 connect adjacent two layers of wave bars, as well as an inflow end 216 and an outflow end 217. From the outflow end 217 toward the inflow end 216, the adjacent connected portions of the multiple first support rods 211 and the multiple second support rods 213 form a node AH. Multiple nodes H in the same layer are flush with each other in the circumferential direction of the petal frame 2. Similarly, multiple nodes AG are also flush with each other in the circumferential direction of the petal frame 2.

[0041] The first support rod 211 is a support rod arranged in the radial direction, while the second support rod 213 is a support rod arranged in the axial direction. The first support rod 211 and the second support rod 213 are alternately arranged on the petal frame 2.

[0042] Therefore, during the compression process of the valve frame 2, all nodes AH of the valve frame 2 move radially synchronously with the movement of the first support rod 211 and the second support rod 213, causing the corresponding grid units to shrink inward uniformly, and the two ends of the valve frame 2 expand axially along the valve frame 2; during the expansion process of the valve frame 2, all nodes AH of the valve frame 2 expand radially synchronously, and the two ends of the valve frame 2 (i.e., the inflow end and the outflow end) shrink axially along the valve frame 2, the end located at the outflow end moves along the "outflow end-inflow end" direction, and the end located at the inflow end moves along the "inflow end-outflow end" direction, thereby forming the radial shrinkage and axial expansion of the valve frame 2, thereby ensuring that the support rod 211 is subjected to uniform force during the above shrinkage or expansion process, shrinking or expanding in a predetermined manner, without twisting or deformation that would cause the artificial valve 1 to fail.

[0043] Furthermore, regardless of whether it is during contraction or expansion, since the node AH is aligned with the circumferential direction of the petal frame 2, the second support rod 213 is always parallel to the axial direction of the petal frame 2. Therefore, during the compression or expansion of the petal frame 2, the second support rod 213 will not deform, thereby providing support for the first support rod 211 during the compression or expansion process, ensuring that the compression or expansion process can be carried out smoothly.

[0044] Please refer to the following: Figure 3 From the outflow end 217 toward the inflow end 216, the petal frame 2 has a first grid unit 21, a second grid unit 22, a third grid unit 23 and a fourth grid unit 24, and multiple grid units in the same layer form a grid; the petal frame 2 has at least 3 grid units evenly distributed in the circumferential direction.

[0045] The first grid unit 21 and the fourth grid unit 24 are each composed of four first support rods 211 and two second support rods 213, and their overall shape is hexagonal or hexagonal-like; the second grid unit 22 and the third grid unit 23 are each composed of four first support rods 211, and their overall shape is quadrilateral or quadrilateral-like.

[0046] With the above settings, the first grid unit 21, the second grid unit 22, the third grid unit 23 and the fourth grid unit 24 can freely switch between the natural state and the contracted state, thereby facilitating the switching of the petal frame 2 between the natural state and the contracted state.

[0047] The petal frame 2 also has an end portion 212, which is formed by the intersecting portions of two adjacent first support rods 211 near the outflow end or the inflow end (forming the node A and the node H). The end portion 212 is generally U-shaped and includes two symmetrically arranged sides, each side including a first curved segment 2121 and a second curved segment 2122. One end of the first curved segment 2121 is connected to the first support rod 211, the other end of the first curved segment 2121 is connected to one end of the second curved segment 2122, and the other end of the second curved segment 2122 is connected to the other end of the other second curved segment 2122.

[0048] With the above arrangement, at least three bending segments are formed between two adjacent first support rods 211 and the end 212 located between them. In this way, the bending segments are used to reduce the stress concentration during the contraction or expansion of the petiole frame 2, and the stress is evenly distributed to the three bending segments. This can prevent the end 212 from breaking, maintain the integrity of the overall structure of the petiole frame 2, and improve the reliability of the petiole frame 2.

[0049] Furthermore, in some possible embodiments, the first curved segment 2121 has a central angle α, and the second curved segment 2122 has a central angle β; in the natural state, the central angle α is greater than the central angle β.

[0050] With the above settings, the central angle a is greater than the central angle b, which can improve the overall stability of the end 212. During the expansion process, the second bending section 2122 can limit the expansion stroke of the two adjacent first support rods 211, thereby avoiding the first grid unit 21 and the second grid unit 24 from being twisted and deformed due to excessive expansion of the two adjacent first support rods 211, which would cause the artificial valve 1 to fail.

[0051] Please see Figure 3 , Figure 5 In its natural state, the width of the first grid unit 21 in the circumferential direction is W1 (i.e., the distance between two adjacent first support rods 211 or the distance between two adjacent second support rods 213); in its contracted state, the width of the first grid unit 21 in the circumferential direction is W2; wherein, generally, the width W1 is 3-20 times the width W2; preferably, the width W1 is 3-15 times the width W2; more preferably, the width W1 is 5-10 times the width W2.

[0052] With the above settings, the width W1 in the natural state is much larger than the width W2 in the contracted state; the larger width W1 can ensure that the valve frame 2 has sufficient radial support force after it is fully expanded, while the smaller width W2 can ensure that the valve frame 2 is easy to deliver through the catheter after it is contracted.

[0053] In some possible embodiments, when the petal frame 2 is compressed in the contracted state, the first grid unit 21 and the fourth grid unit 24 are flat and elongated, wherein the radius of the arc segment 214 of the end 212 is r, and the distance between two adjacent nodes G is W2, where W2 is greater than 2×r.

[0054] With the above settings, in the contracted state, the distance W3 between two adjacent nodes G is greater than twice r, making the fourth grid unit 24 a flat and elongated structure; similarly, the first grid unit 21 with the above settings is also a flat and elongated structure. This allows the first grid unit 21 and the fourth grid unit 24 to be expanded by a smaller external force, so the initial inflation pressure of the balloon used to expand the valve frame 2 can be smaller, thereby reducing the expansion time of the valve frame 2 and facilitating its smooth expansion; in addition, it can prevent the balloon from rupturing due to excessive inflation pressure during the expansion of the valve frame 2, avoiding device failure and improving device reliability.

[0055] likeFigure 6 As shown, in some possible embodiments, the artificial valve 1 can be implanted into the aortic annulus via the aorta 5 to replace the aortic valve. Of course, the artificial valve 1 can also be implanted into the mitral or tricuspid annulus to replace the mitral or tricuspid valve, depending on the actual situation.

[0056] like Figure 7 As shown, in some possible embodiments, the sidewall of the end 212a is provided with a groove 215, which extends from the arc segment 214 toward the outflow end 217 or the inflow end 216.

[0057] With the above configuration, the end portion 212a can better absorb the force from the two adjacent first support rods 211 during contraction or expansion. At the same time, by utilizing the first curved section 2121, the second curved section 2122, and the arc 214, the stress during contraction or expansion is distributed more evenly, ensuring that the end portion 212a will not be damaged due to stress concentration, and ensuring the reliability of the artificial valve 1.

[0058] like Figure 8 As shown, in some possible embodiments, the petal frame 2a has four layers of mesh, wherein the first mesh unit 21 near the outflow end 217 is composed of four first support rods 211 and two second support rods 213, and the overall shape is hexagonal or quasi-hexagonal; the mesh units 22a of the remaining three layers of mesh are all composed of four first support rods 211, and the overall shape is quadrilateral or quasi-quadrilateral.

[0059] like Figure 9 As shown, in some possible embodiments, the petal frame 2b has four layers of mesh, wherein the first mesh unit 21 near the inflow end 216 is composed of four first support rods 211 and two second support rods 213, and the overall shape is hexagonal or quasi-hexagonal; the mesh units 22a of the remaining three layers of mesh are all composed of four first support rods 211, and the overall shape is quadrilateral or quasi-quadrilateral.

[0060] like Figure 10 As shown, in some possible embodiments, the petal frame 2c has four layers of mesh, wherein each layer of mesh unit 22a is composed of four first support rods 211, and the overall shape is quadrilateral or quadrilateral.

[0061] Please refer to the following: Figure 1 The artificial valve also includes a cover membrane 4, which is sutured to the inner and / or outer surface of the valve frame. The cover membrane 4 may be made of materials such as polytetrafluoroethylene (PTFE), polypropylene (PP), polyethylene (PE), and polyethylene terephthalate (PET).

[0062] The leaflet 3 is sutured to the covering membrane 4 and is sutured into the central channel inside the valve frame 2. The leaflet 4 acts as a one-way valve, allowing blood to flow in only one direction. The leaflet 3 can be made of animal-derived materials, such as bovine or porcine pericardium; it can also be made of polymer materials.

[0063] To ensure that the petiole frame 2 has good support and deformation plasticity, its material can be stainless steel, cobalt-chromium alloy, etc.

[0064] like Figure 11 As shown, in some possible embodiments, the petiole frame is provided with a figure-eight shaped double-grid structure 6. The double-grid structure 6 includes grid cells 61 and 62 arranged adjacent to each other in the axial direction. The grid cell 61 is a hexagonal or hexagonal structure, and the grid cell 62 is a rhombus or rhombus structure. The grid cell 61 has 6 nodes (node ​​A, two nodes B, two nodes C, and node D), and the grid cell 62 has 4 nodes (node ​​D, two nodes E, and node F). Among them, nodes A, D, and F are located on the same straight line, and the straight line is parallel to the axial direction of the petiole frame; nodes B, C, and E are located on the same straight line, and the straight line is also parallel to the axial direction of the petiole frame.

[0065] With the above configuration, during the compression or expansion of the valve frame, the double-grid structure 6 can deform at the corresponding node positions, thus preventing the support rod 211 from twisting and deforming. When the valve frame is inflated by the balloon, the double-grid structure 6 restrains each other in the axial direction of the valve frame, thereby preventing the valve frame from being rapidly expanded in the axial direction when the balloon inflates and expands to the initial critical pressure, so as to avoid the twisting and deformation of the support rod 211 of the valve frame.

[0066] like Figure 12 As shown, in some possible embodiments, the petiole frame is provided with another figure-eight shaped double grid structure 7. The double grid structure 7 includes grid units 71 and 72 arranged adjacent to each other in the circumferential direction. The grid units 71 and 72 are both rhomboid or rhomboid structures. Each grid unit 71 and 72 has 4 nodes (node ​​C, two nodes D and node E). Among them, node C and node E are located on the same straight line, and the straight line is parallel to the axial direction of the petiole frame.

[0067] With the above configuration, when the valve frame is inflated by the balloon, the double mesh structure 7 restrains each other in the circumferential direction of the valve frame, thereby preventing the valve frame from being rapidly expanded in the circumferential direction when the balloon is inflated to the initial critical pressure, so as to avoid the twisting and deformation of the valve frame support 211.

[0068] In other words, when hexagonal grid cells 61 and quadrilateral grid cells 62 are arranged adjacent to each other in the axial direction, at least three nodes (corresponding to the vertices of the hexagon and quadrilateral) are located on the same straight line and the straight line is parallel to the axial direction; when quadrilateral grid cells 71 and quadrilateral grid cells 72 are arranged adjacent to each other in the circumferential direction, at least three nodes (corresponding to the vertices of the quadrilateral) are located on the same straight line and the straight line is parallel to the circumferential direction.

[0069] like Figure 13 As shown, in some possible embodiments, the valve frame 2d is provided with at least one double-mesh structure 6 and at least one double-mesh structure 7, wherein the double-mesh structure 6 and the double-mesh structure 7 are arranged intersectingly; when the valve frame is inflated by the balloon, the double-mesh structures 6 and 7 restrain each other in the axial and circumferential directions of the valve frame, thereby preventing the valve frame from being rapidly expanded in the axial and circumferential directions instantaneously when the balloon is inflated to the initial critical pressure, so as to avoid the twisting and deformation of the valve frame support 211.

[0070] like Figures 14-15 As shown, in some possible embodiments, the petiole frame 2e is a split structure, which is composed of multiple double-mesh structures 8. Each double-mesh structure 8 has multiple through holes 81. The petiole frame 2e is formed by splicing and assembling multiple double-mesh structures 8 that are evenly distributed in the circumferential direction. The splicing and assembly can be fixed by means of connection such as pins or sutures.

[0071] By using the above configuration, the dual-grid structure 8 can be modularized, and the number of dual-grid structures 8 can be selected according to the size of the patient's aortic valve annulus, mitral valve annulus, or tricuspid valve annulus. This facilitates adjustment of the radial size of the valve frame without the need to set up multiple valve frame sizes separately.

[0072] For example, the 12 dual-grid structures 8 are assembled circumferentially using pins to form a split-structure petal frame.

[0073] like Figure 16 As shown, in some possible embodiments, the petal frame 2f is a split structure, which is composed of multiple double-grid structures 8. The petal frame 2f is formed by splicing and assembling multiple double-grid structures 8 evenly distributed in the axial and circumferential directions.

[0074] With the above settings, the number of the double-grid structures 8 can be selected according to the size of the patient's aortic valve annulus, mitral valve annulus, or tricuspid valve annulus, which facilitates the adjustment of the axial and radial dimensions of the valve frame without the need to set up multiple valve frame specifications.

[0075] like Figure 17As shown, in some possible embodiments, the valve frame 2g includes multiple double-mesh structures 6, one of which is circumferentially offset from an adjacent double-mesh structure 6 but axially connected. With this arrangement, during the inflation and expansion of the valve frame 2g by the balloon, the two adjacent double-mesh structures 6 can further restrain each other axially, thereby preventing the valve frame from being rapidly expanded axially when the balloon inflation and expansion reaches the initial critical pressure, thus avoiding the twisting and deformation of the valve frame 2g's support rod 211.

[0076] like Figure 18 As shown, in some possible embodiments, the petiole frame 2h includes multiple double-grid structures 7, one of which is circumferentially misaligned with an adjacent double-grid structure 7 but axially connected. This arrangement also helps to prevent the support rod 211 of the petiole frame 2h from twisting or deforming.

[0077] It should be noted that the double grid structure described above is filled in the illustration only to facilitate understanding of the double grid structure by those skilled in the art, and the filling lines do not constitute a limitation on the double grid structure.

[0078] It should be noted that the terms "one embodiment," "embodiment," "exemplary embodiment," "some embodiments," etc., mentioned in the specification indicate that the described embodiment may include a specific feature, structure, or characteristic, but not every embodiment necessarily includes that specific feature, structure, or characteristic. Furthermore, such phrases do not necessarily refer to the same embodiment. Moreover, when a specific feature, structure, or characteristic is described in connection with an embodiment, implementing such a feature, structure, or characteristic in conjunction with other embodiments, whether explicitly described or not, is within the knowledge scope of those skilled in the art.

[0079] It should be readily understood that “on,” “above,” and “on top of” in this disclosure should be interpreted in the broadest manner, such that “on” means not only “directly on something” but also “on something” with an intermediate feature or layer therebetween, and that “above” or “on top of” means not only “on something” but also “on something” without an intermediate feature or layer therebetween (i.e., directly on something).

[0080] Furthermore, for ease of explanation, spatially relative terms such as "below," "below," "under," "above," and "above" may be used to describe the relationship of one element or feature relative to other elements or features as shown in the figures. Spatially relative terms are intended to encompass different orientations of the device in use or operation other than those shown in the figures. The device may have other orientations (rotated 90 degrees or in other orientations), and the spatially relative descriptive terms used herein may be interpreted accordingly.

[0081] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0082] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. An artificial valve, characterized in that, The artificial valve includes a valve frame and leaflets; the leaflets are disposed in the valve frame; the valve frame includes multiple double-grid structures, each double-grid structure including a first grid unit and a second grid unit disposed adjacent to each other in the circumferential or axial direction of the valve frame, wherein at least three vertices of the first grid unit and the second grid unit are located on the same straight line in the circumferential or axial direction of the valve frame; one of the double-grid structures is circumferentially misaligned with the other adjacent double-grid structure but axially connected.

2. The artificial valve according to claim 1, characterized in that, The straight line is parallel to the circumferential or axial direction of the petiole.

3. The artificial valve according to claim 2, characterized in that, The petal frame is a split structure. The double-grid structure has multiple through holes. The petal frame is formed by splicing and assembling multiple double-grid structures that are evenly distributed in the circumferential and / or axial directions.

4. The artificial valve according to claim 1, characterized in that, The flap frame includes multiple layers of wave rods, each layer of wave rods includes multiple interconnected support rods, and the intersecting portions of two adjacent support rods form nodes; in the natural state and the contracted state, the multiple nodes of the same layer are flush with each other in the circumferential direction of the flap frame.

5. The artificial valve according to claim 4, characterized in that, The petal frame has multiple layers of mesh, each layer of which includes multiple first mesh units or second mesh units; the petal frame has at least three first mesh units or second mesh units evenly distributed in the circumferential direction.

6. The artificial valve according to claim 5, characterized in that, The first grid cell or the second grid cell consists of at least four of the aforementioned support rods.

7. The artificial valve according to claim 4, characterized in that, The valve frame also has an end, an outflow end, and an inflow end. The end is composed of the intersecting portions of two adjacent support rods near the outflow end or the inflow end. The end is generally U-shaped and includes two sides, each side including a first curved segment and a second curved segment. One end of the first curved segment is connected to the support rod, the other end of the first curved segment is connected to one end of the second curved segment, and the other end of the second curved segment is connected to the other end of another second curved segment.

8. The artificial valve according to claim 7, characterized in that, The first curved segment has a central angle α, and the second curved segment has a central angle b; in the natural state, the central angle α is greater than the central angle b.

9. The artificial valve according to claim 4, characterized in that, In its natural state, the width of the first or second grid cell in the circumferential direction is W1; in its contracted state, the width of the first or second grid cell in the circumferential direction is W2; wherein the width W1 is 3-20 times the width W2.

10. The artificial valve according to claim 9, characterized in that, In the contracted state, after the petal frame is compressed, the grid unit is flat and elongated, wherein the radius of the arc segment at the end of the petal frame is r, and the distance between two adjacent nodes at the end is W2, where W2 is greater than 2×r.

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