Surgical prosthetic heart valve

Abstract

Disclosed is a surgical prosthetic heart valve, comprising a first valve and a second valve that are sequentially connected in a long-axis direction. One of 3 valve struts of the first valve is close to one of 3 valve struts of the second valve, and the distances between the other two valve struts of the first valve and the other two valve struts of the second valve all exceed the inner diameter of a first supporting seat or a second supporting seat.

Description

Surgical prosthetic heart valve

[0001] This application claims priority to the Chinese patent application No. 202411320675.4 filed on September 23, 2024 with the Chinese Patent Office, the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0002] The present application belongs to the technical field of medical devices, for example, a surgical prosthetic heart valve. BACKGROUND

[0003] Mitral regurgitation is a common mitral valve disease, and the treatment methods for patients with mitral regurgitation include repair and replacement. Since the treatment effect of repair is limited, the mitral valve often needs to be replaced. Traditional replacement products include mechanical valves and biological valves.

[0004] Mechanical valves have good durability and are not prone to wear, but they require lifelong use of anticoagulant drugs to prevent thrombosis, increasing the risk of internal bleeding. Biological valves have the advantages of less trauma and faster postoperative recovery compared to mechanical valves. For biological valves with a circular overall shape, they are composed of three elastic valve leaves that can open and close with pressure. The valve leaves are fixed on the valve frame by suturing, and the valve frame usually has a certain height, and the height of the valve frame increases with the increase of the valve.

[0005] CN116616963A discloses an artificial heart valve, which includes at least two incompressible valves; each of the at least two incompressible valves independently includes a support seat, a metal frame arranged on the top surface of the support seat, and a valve leaf attached to the metal frame; adjacent two incompressible valves are connected; and the cross-sectional area of the artificial heart valve is less than or equal to the sum of the cross-sectional areas of the at least two incompressible valves that make up the artificial heart valve.

[0006] Therefore, in the related art, a surgical double-orifice mitral valve divides the pressure borne by a single valve by splitting a larger opening valve into two smaller opening valves, thereby improving the durability of the valve. At the same time, the two smaller openings are arranged in close proximity, and the shape is approximately elliptical, which is more in line with the shape of the native mitral annulus, thereby reducing the impact of the implanted artificial biological mitral valve on the aortic valve.

[0007] However, patients with mitral valve disease have the problem of compensatory hypertrophy of ventricular muscle. When the double-orifice mitral valve is implanted, the valve foot on the long axis of the outflow side will be in contact and extrusion with the anterior and posterior walls of the ventricle. This contact and extrusion limits the movement of the valve leaf to some extent, and the contact between the valve foot and the ventricle also accelerates the extension of scar tissue on the valve leaf. SUMMARY

[0008] The application provides a surgical artificial heart valve which avoids the problem of reduced effective opening area caused by muscle tissue extrusion through specific arrangement of the valve foot positions.

[0009] The application provides a surgical artificial heart valve which avoids the problem of reduced effective opening area caused by muscle tissue extrusion through specific arrangement of the valve foot positions.

[0010] The first valve comprises a first support seat, three first valve feet arranged on the outflow side of the first support seat, and a first valve leaflet attached to the three first valve feet; the three first valve feet are evenly distributed on the outflow side of the first support seat.

[0011] The second valve comprises a second support seat, three second valve feet arranged on the outflow side of the second support seat, and a second valve leaflet attached to the three second valve feet; the three second valve feet are evenly distributed on the outflow side of the second support seat.

[0012] The distance between the nearest first valve foot and the nearest second valve foot is a, and a≤3mm; the distance between any first valve foot and its nearest second valve foot is b1mm, the distance between the other first valve foot and its nearest second valve foot is b2mm, the inner diameter of the first support seat is d1mm, and the inner diameter of the second support seat is d2mm; d1<b1<2d1, and d2<b2<2d2.

[0013] Optionally, the value of d1 is 15-25, for example, it can be 15, 16, 18, 20, 21, 24 or 25, and the remaining values in the numerical range are also applicable.

[0014] Optionally, the value of d2 is 15-25, for example, it can be 15, 16, 18, 20, 21, 24 or 25, and the remaining values in the numerical range are also applicable.

[0015] Optionally, b1 and b2 satisfy the following relationship: b1=b2.

[0016] Optionally, the first support seat of the first valve is connected with the second support seat of the second valve.

[0017] Optionally, the connection mode of the first support seat and the second support seat comprises any one or a combination of at least two of welding, riveting or buckle connection.

[0018] Optionally, the side of the first support seat away from the second support seat is provided with a first arc-shaped belt.

[0019] and / or,

[0020] The second support seat is provided with a second arc-shaped band on the side away from the first support seat.

[0021] Optionally, the first arc-shaped band comprises a first starting point and a first ending point.

[0022] The second arc-shaped band comprises a second starting point and a second ending point.

[0023] The distance between the first starting point and the second starting point is c1 mm, and the c1 satisfies: 20≤c1≤40, for example, it can be 25, 25, 30, 35 or 40, and the remaining unlisted values in the numerical range are also applicable.

[0024] The distance between the first ending point and the second ending point is c2 mm, and the c2 satisfies: 20≤c2≤40, for example, it can be 25, 25, 30, 35 or 40, and the remaining unlisted values in the numerical range are also applicable.

[0025] Optionally, the distance between the first starting point and the second starting point is c1 mm, and c1<1.5d1.

[0026] The distance between the first ending point and the second ending point is c2 mm, and c2<1.5d2.

[0027] Optionally, the c1 and the c2 satisfy the following relationship: c1=c2.

[0028] Optionally, the edges of the first leaflet unstitched portion are sequentially butted and jointed to form a first valve structure, the first valve structure forms a small hole at the center of the first valve, and the convex surface of each first leaflet faces the same side.

[0029] The edges of the second leaflet unstitched portion are sequentially butted and jointed to form a second valve structure, the second valve structure forms a small hole at the center of the second valve, and the convex surface of each second leaflet faces the same side. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 is a structural top view of the outflow side of a surgical artificial heart valve provided by Comparative Example 1;

[0031] Figure 2 is a schematic diagram of the effective opening area when the surgical artificial heart valve provided by Comparative Example 1 is used;

[0032] Figure 3 is a structural top view of the outflow side of a surgical artificial heart valve provided by Example 1;

[0033] Figure 4 is a schematic diagram of the effective opening area when the surgical artificial heart valve provided by Example 1 is used;

[0034] Figure 5 is a structural schematic diagram of a surgical artificial heart valve provided in Example 2;

[0035] Figure 6 is a structural schematic diagram of a surgical artificial heart valve provided in Example 3;

[0036] Figure 7 is a structural top view of the outflow side of a surgical artificial heart valve provided in the present application;

[0037] Figure 8 is a structural schematic diagram of a surgical artificial heart valve provided in the present application.

[0038] Wherein: 1, the outermost first valve leaflet; 2, the outermost second valve leaflet; 3, the first valve leaflet B; 4, the first valve leaflet C; 5, the second valve leaflet B; 6, the second valve leaflet C; 10, the first arc-shaped band; 20, the second arc-shaped band;

[0039] 110, the first support seat; 120, the first valve leaflet; 130, the first valve leaflet; 140, the first arc-shaped band; 141, the first starting point; 142, the first end point;

[0040] 210, the second support seat; 220, the second valve leaflet; 230, the second valve leaflet; 240, the second arc-shaped band; 241, the second starting point; 242, the second end point. DETAILED DESCRIPTION

[0041] The distance parameters in the specific embodiments of the present application ignore the wall thickness of the first support seat, the second support seat, the first valve leaflet, and the second valve leaflet.

[0042] Figure 7 is a structural top view of the outflow side of a surgical artificial heart valve provided in the present application, as shown in Figure 7, the present application provides a surgical artificial heart valve, which includes a first valve and a second valve connected in turn along the long axis direction;

[0043] The first valve includes a first support seat 110, three first valve leaflets 120 arranged on the outflow side of the first support seat 110, and a first valve leaflet 130 attached to the three first valve leaflets 120; The three first valve leaflets 120 are evenly distributed on the outflow side of the first support seat 110;

[0044] The second valve includes a second support seat 210, three second valve leaflets 220 arranged on the outflow side of the second support seat 210, and a second valve leaflet 230 attached to the three second valve leaflets 220; The three second valve leaflets 220 are evenly distributed on the outflow side of the second support seat 210;

[0045] Among the three first valve leaflets 120 and the three second valve leaflets 220, the distance between the closest first valve leaflet 120 and the second valve leaflet 220 is a, and a≤3mm; the distance between any one of the other two first valve leaflets 120 and the closest second valve leaflet 220 is b1mm, the distance between the other first valve leaflet 120 and the closest second valve leaflet 220 is b2mm, the inner diameter of the first support base 110 is d1mm, and the inner diameter of the second support base 210 is d2mm, then d1<b1<2d1, and d2<b2<2d2.

[0046] Since patients with mitral valve disease have compensatory hypertrophy of ventricular muscle, the valve leaflets of conventional structural surgical artificial heart valves have the defect of limiting the movement of the valve leaflets when they are in contact with the anterior and posterior walls of the ventricle. The present application makes one of the three first valve leaflets and one of the three second valve leaflets close to each other, while the other two first valve leaflets and the other two second valve leaflets are both more than the inner diameter of the first support base or the second support base, so that when the valve leaflets interfere with the muscle tissue, the two valve leaflets can form a face that blocks the myocardial tissue from pressing the outflow opening of the valve from both sides of the long axis direction, ensuring the effective opening area of the valve.

[0047] In some embodiments, the material of the first support base 110 includes any one or a combination of at least two of polyethylene terephthalate (PET), cobalt-chromium-nickel alloy, or stainless steel; the stainless steel includes 316L stainless steel or 317L stainless steel.

[0048] The connection mode of the first support base 110, the first valve leaflet 130, and the first valve leaflet 120 in the present application can be set according to actual needs. For example, the first support base 110, the first valve leaflet 130, and the first valve leaflet 120 are connected by a fabric layer.

[0049] For example, the material of the fabric layer includes polyester and / or polytetrafluoroethylene (PTFE).

[0050] In some embodiments, the material of the second support base 210 includes any one or a combination of at least two of PET, cobalt-chromium-nickel alloy, or stainless steel; the stainless steel includes 316L stainless steel or 317L stainless steel.

[0051] The connection mode of the second support seat 210, the second leaflet 230 and the second valve cusp 220 in the present application can also be set according to actual needs. For example, the second support seat 210, the second leaflet 230 and the second valve cusp 220 are connected through a fabric layer.

[0052] For example, the material of the fabric layer includes polyester and / or PTFE.

[0053] In some embodiments, the value of d1 is 15-25, for example, it can be 15, 16, 18, 20, 21, 24 or 25, and the remaining values in the numerical range are also applicable.

[0054] In some embodiments, the value of d2 is 15-25, for example, it can be 15, 16, 18, 20, 21, 24 or 25, and the remaining values in the numerical range are also applicable.

[0055] In some embodiments, b1 and b2 satisfy the following relationship: b1 = b2.

[0056] Optionally, when the relationship between b1 and b2 satisfies b1 = b2, in the overhead view of the surgical artificial heart valve, one first valve cusp 120 in the first valve and one second valve cusp 220 in the second valve are closest, and the other two first valve cusps 120 in the second valve and the other two second valve cusps 220 in the second valve form a rectangle, at this time, the opening area of the surgical artificial heart valve can be effectively guaranteed, and the situation that the effective opening area is reduced due to the muscle tissue surrounding the cusp can be greatly avoided.

[0057] In some embodiments, the first support seat 110 of the first valve is connected with the second support seat 210 of the second valve.

[0058] In some embodiments, the connection mode of the first support seat 110 and the second support seat 210 includes any one or a combination of at least two of welding, riveting or buckle connection.

[0059] In some embodiments, when the connection mode of the first support seat 110 and the second support seat 210 is buckle connection, the buckle includes a resilient portion.

[0060] The native mitral valve annulus is saddle-shaped, and in three-dimensional space, the anterior leaflet and the posterior leaflet are higher than the junction. During the process of heart contraction and diastole, the mitral valve annulus also moves, and the junctions of the anterior and posterior leaflets on the inside and outside will fold downward along the anterior and posterior diameters of the mitral valve. Through the setting of the resilient portion, the surgical artificial heart valve can still have the condition of movement after implantation, and the ability of muscle tissue contraction and diastole is maximally retained.

[0061] Exemplarily, the elastic part can include a spring or a flexible connector, as long as the relative movement of the first valve and the second valve in a certain space can be realized.

[0062] In some embodiments, as shown in FIG. 8, the first support base 110 is provided with a first arc-shaped band 140 away from one side of the second support base 210;

[0063] and / or,

[0064] The second support base 210 is provided with a second arc-shaped band 240 away from one side of the first support base 110.

[0065] The present application can effectively prevent the muscle tissue in the ventricle from interfering with the normal operation of the surgical artificial heart valve by providing the first arc-shaped band 140 and / or the second arc-shaped band 240. The arc-shaped bands provided on both sides of the long axis direction of the surgical artificial heart valve form a channel on the outflow side, which can effectively optimize the hemodynamics and reduce the formation of thrombus.

[0066] In some embodiments, the first arc-shaped band 140 includes a first starting point 141 and a first ending point 142;

[0067] The second arc-shaped band 240 has a second starting point 241 closest to the first starting point 141 and a second ending point 242 closest to the first ending point 142;

[0068] The distance between the first starting point 141 and the second starting point 241 is c1 mm, and c1 satisfies: 20≤c1≤40, for example, it can be 25, 25, 30, 35 or 40, and the remaining values in the numerical range are also applicable;

[0069] The distance between the first ending point 142 and the second ending point 242 is c2 mm, and c2 satisfies: 20≤c2≤40, for example, it can be 25, 25, 30, 35 or 40, and the remaining values in the numerical range are also applicable

[0070] In some embodiments, the distance between the first starting point 141 and the second starting point 241 is c1 mm, and c1<1.5d1, and optionally c1=0.5d1;

[0071] The distance between the first ending point 142 and the second ending point 242 is c2 mm, and c2<1.5d2, and optionally c2=0.5d2.

[0072] In some embodiments, c1 and c2 satisfy the following relationship: c1=c2.

[0073] In some embodiments, the material of the first arc-shaped band 140 and the second arc-shaped band 240 comprises a polymer material.

[0074] In the present application, the material of the first arc-shaped band 140 and the second arc-shaped band 240 is a polymer material. The polymer material has certain hardness, flexibility and elasticity, which can effectively reduce the extension rate of scar tissue, prevent the endothelialization of the first leaflet and the second leaflet, and improve the durability of the surgical artificial heart valve.

[0075] For example, the polymer material comprises any one of polypropylene (PP), polyphenylene sulfone (PPSU) or PET, or a combination of at least two of them. For example, the polymer material can be PET.

[0076] In some embodiments, the height of the first arc-shaped band 140 and / or the second arc-shaped band 240 is less than the height of the first valve leaflet 120 and the height of the second valve leaflet 220.

[0077] In some embodiments, the first arc-shaped band 140 is a continuous arc-shaped band from the first starting point 141 to the first ending point 142, or a spaced arc-shaped band formed by a plurality of segments with intervals.

[0078] In some embodiments, the second arc-shaped band 240 is a continuous arc-shaped band from the second starting point 241 to the second ending point 242, or a spaced arc-shaped band formed by a plurality of segments with intervals.

[0079] In some embodiments, the edges of the non-stitched portions of the first leaflets are sequentially butted and joined to form a first valve structure, the first valve structure forms a small hole at the center of the first valve, and the convex surface of each first leaflet faces the same side.

[0080] The edges of the non-stitched portions of the second leaflets are sequentially butted and joined to form a second valve structure, the second valve structure forms a small hole at the center of the second valve, and the convex surface of each second leaflet faces the same side.

[0081] In the present application, the structure of the first leaflet and the second leaflet is a conventional structure in the art. For example, the material of the first leaflet and the second leaflet comprises an elastic material, which comprises a biological tissue material or a polymer material. Optionally, the biological tissue material comprises bovine pericardium or porcine pericardium.

[0082] Comparative Example 1

[0083] The present comparative example provides a surgical artificial heart valve, the top view of which is shown in FIG. 1, which comprises a first valve and a second valve connected in sequence along the long axis direction.

[0084] The first valve comprises a first support base (316L stainless steel, inner diameter 20 mm), three first valve legs arranged on the outflow side of the first support base, and a first valve leaflet (pig pericardium) attached to the three first valve legs; the three first valve legs are evenly distributed on the outflow side of the first support base, and one of the first valve legs (named outermost first valve leg 1) is distributed on the outermost side away from the second valve in the long axis direction; the first support base, the first valve leaflet, and the first valve leg are connected by a PTFE fabric layer;

[0085] The second valve comprises a second support base (316L stainless steel, inner diameter 20 mm), three second valve legs arranged on the outflow side of the second support base, and a second valve leaflet (pig pericardium) attached to the three second valve legs; the three second valve legs are evenly distributed on the outflow side of the second support base, and one of the second valve legs (named outermost second valve leg 2) is distributed on the outermost side away from the first valve in the long axis direction; the second support base, the second valve leaflet, and the second valve leg are connected by a PTFE fabric layer;

[0086] The first support base and the second support base are connected by welding.

[0087] The edges of the non-sewn parts of the first valve leaflets are sequentially butted and joined to form a first valve structure, a small hole is formed in the center of the first valve, and the convex surface of each first valve leaflet faces the same side;

[0088] The edges of the non-sewn parts of the second valve leaflets are sequentially butted and joined to form a second valve structure, a small hole is formed in the center of the second valve, and the convex surface of each second valve leaflet faces the same side.

[0089] When the surgical artificial heart valve provided by the comparative example is used, the myocardial tissue around the valve leg interferes with it, that is, the myocardial tissue around the valve leg is squeezed, and then the valve leg is surrounded, thereby blocking the opening on the outflow side of the surgical artificial heart valve, reducing the effective opening area of the valve (as shown in FIG. 2, the shadow represents the surrounding myocardial tissue).

[0090] Example 1

[0091] The surgical artificial heart valve provided by the example comprises a first valve and a second valve connected in sequence along the long axis direction, as shown in the top view of FIG. 3.

[0092] The first valve comprises a first support base (316L stainless steel, inner diameter 20mm), three first valve legs (first valve leg A, first valve leg B 3 and first valve leg C 4) arranged on the outflow side of the first support base, and first valve leaflets (porcine pericardium) attached to the three first valve legs; the first support base, the first valve leaflets and the first valve legs are connected by a PTFE fabric layer;

[0093] The second valve comprises a second support base (316L stainless steel, inner diameter 20mm), three second valve legs (second valve leg A, second valve leg B 5 and second valve leg C 6) arranged on the outflow side of the second support base, and second valve leaflets (porcine pericardium) attached to the three second valve legs; the second support base, the second valve leaflets and the second valve legs are connected by a PTFE fabric layer;

[0094] Among the three first valve legs and the three second valve legs, the distance between the closest first valve leg A and the closest second valve leg A is a, and a is 0mm; the distance between the first valve leg B 3 and the closest second valve leg B 5 is 30mm, and the distance between the first valve leg C 4 and the closest second valve leg C 6 is 30mm.

[0095] The connection mode of the first support base and the second support base is welding.

[0096] The edges of the non-sewn parts of the first valve leaflets are successively butted and joined to form a first valve structure, a small hole is formed in the center of the first valve structure, and the convex surface of each first valve leaflet faces the same side;

[0097] The edges of the non-sewn parts of the second valve leaflets are successively butted and joined to form a second valve structure, a small hole is formed in the center of the second valve structure, and the convex surface of each second valve leaflet faces the same side.

[0098] When the surgical artificial heart valve provided in the embodiment is used, the myocardial tissue around the valve legs interferes with the valve legs, but the four valve legs (first valve leg B 3, first valve leg C 4, second valve leg B 5 and second valve leg C 6) on both sides of the long axis direction form a surface that blocks the myocardial tissue from pressing the surgical artificial heart valve, thereby improving the effective opening area (see FIG. 4, the shadow represents the surrounding myocardial tissue).

[0099] Example 2

[0100] The embodiment provides a surgical artificial heart valve, as shown in Figure 5, which is different from that of the embodiment 1, and the first arc-shaped band 10 made of PET is arranged on the side of the first support base away from the second support base, and the second arc-shaped band 20 made of PET is arranged on the side of the second support base away from the first support base;

[0101] The first arc-shaped band 10 comprises a first starting point and a first terminal point;

[0102] The second arc-shaped band 20 comprises a second starting point and a second terminal point, wherein the end point closest to the first starting point is the second starting point, and the end point closest to the second terminal point is the second terminal point;

[0103] The first arc-shaped band 10 is a continuous arc-shaped band from the first starting point to the first terminal point, and the second arc-shaped band 20 is a continuous arc-shaped band from the second starting point to the second terminal point;

[0104] The distance between the first starting point and the second starting point is 10mm;

[0105] The distance between the first terminal point and the second terminal point is 10mm.

[0106] Compared with the embodiment 1, the surgical artificial heart valve provided by the embodiment can effectively prevent the muscle tissue in the ventricle from interfering with the normal work of the surgical artificial heart valve, the arc-shaped bands arranged on both sides of the long axis direction of the surgical artificial heart valve form a channel on the outflow side, and the blood flow dynamics can be effectively optimized, and the formation of thrombus is reduced.

[0107] Moreover, by making the materials of the first arc-shaped band 10 and the second arc-shaped band 20 respectively independent high molecular materials, the extension rate of the scar tissue can be effectively reduced, the endothelialization of the first valve leaflet and the second valve leaflet is prevented, and the durability of the surgical artificial heart valve is improved.

[0108] Embodiment 3

[0109] The embodiment provides a surgical artificial heart valve, as shown in Figure 6, which is different from that of the embodiment 1, and the first arc-shaped band 10 made of PET is arranged on the side of the first support base away from the second support base, and the second arc-shaped band 20 made of PET is arranged on the side of the second support base away from the first support base;

[0110] The first arc-shaped band 10 comprises a first starting point and a first terminal point;

[0111] The second arc-shaped band 20 comprises a second starting point and a second terminal point, wherein the end point closest to the first starting point is the second starting point, and the end point closest to the second terminal point is the second terminal point;

[0112] The first arc-shaped band 10 is an interval arc-shaped band from a first starting point to a first ending point; and the second arc-shaped band 20 is an interval arc-shaped band from a second starting point to a second ending point.

[0113] The distance between the first starting point and the second starting point is 10 mm.

[0114] The distance between the first ending point and the second ending point is 10 mm.

[0115] Compared with the embodiment 1, the surgical artificial heart valve provided in the embodiment can further effectively prevent the muscle tissue in the ventricle from interfering with the normal work of the surgical artificial heart valve, and the arc-shaped bands arranged on both sides of the long axis direction of the surgical artificial heart valve form a channel on the outflow side, which can effectively optimize the hemodynamics and reduce the formation of thrombus.

[0116] Moreover, by making the materials of the first arc-shaped band 10 and the second arc-shaped band 20 be high molecular materials respectively, the extension rate of the scar tissue can be effectively reduced, the endothelialization of the first leaflet and the second leaflet can be prevented, and the durability of the surgical artificial heart valve can be improved.

[0117] Embodiment 4

[0118] The embodiment provides a surgical artificial heart valve, which is different from the embodiment 1 in that the connection mode of the first support seat and the second support seat is buckle connection, and the buckle comprises a spring elastic part.

[0119] The native mitral valve annulus is saddle-shaped, and in the three-dimensional space, the position of the anterior leaflet and the posterior leaflet is higher than that of the junction. In the process of heart contraction and diastole, the mitral valve annulus also moves, and the junctions of the anterior and posterior leaflets on the inner side and the outer side will fold downward along the anterior and posterior diameters of the mitral valve. The surgical artificial heart valve provided in the embodiment can still have the condition of movement after implantation through the arrangement of the elastic part, and the ability of muscle tissue contraction and diastole is maximally reserved.

[0120] In summary, the surgical artificial heart valve provided in the embodiment makes the distance between one of the three valve feet of the first valve and one of the three valve feet of the second valve close, and the distance between the other two valve feet of the first valve and the other two valve feet of the second valve all exceeds the inner diameter of the first support seat or the second support seat, so that when the valve feet interfere with the muscle tissue, the two valve feet can form a face for blocking the myocardial tissue from extruding the outflow opening of the valve from the two sides of the long axis direction, and the effective opening area of the valve is ensured.

Claims

1. A surgical artificial heart valve comprising a first valve and a second valve connected in sequence along a long axis direction; the first valve comprising a first support seat, three first valve posts arranged on the outflow side of the first support seat, and first valve leaflets attached to the three first valve posts; the three first valve posts are evenly distributed on the outflow side of the first support seat; the second valve comprising a second support seat, three second valve posts arranged on the outflow side of the second support seat, and second valve leaflets attached to the three second valve posts; the three second valve posts are evenly distributed on the outflow side of the second support seat; of the three first valve posts and the three second valve posts, the distance between the closest first valve post and the closest second valve post is a, and a≤3mm; the distance between any one of the other two first valve posts and the closest second valve post to the first valve post is b1mm, the distance between the other first valve post and the closest second valve post to the first valve post is b2mm, the inner diameter of the first support seat is d1mm, and the inner diameter of the second support seat is d2mm, then d1<b1<2d1, and d2<b2<2d2.

2. The surgical prosthetic heart valve of claim 1, wherein, The value of d1 is 15-25; The value of d2 is 15-25.

3. The surgical prosthetic heart valve of claim 1, wherein, The b1 and the b2 satisfy the following relationship: b1=b2.

4. The surgical prosthetic heart valve of claim 1, wherein, The first support seat of the first valve is connected to the second support seat of the second valve.

5. The surgical prosthetic heart valve of claim 4, wherein, The connection mode of the first support seat and the second support seat includes any one or a combination of at least two of welding, riveting or buckle connection. 6.The surgical artificial heart valve according to any one of claims 1-5, further comprising at least one of the following: a first arc-shaped band is arranged on the side of the first support seat away from the second support seat; or, a second arc-shaped band is arranged on the side of the second support seat away from the first support seat.

7. The surgical prosthetic heart valve of claim 6, wherein, The first arc-shaped band comprises a first starting point and a first ending point. In the second arc-shaped band, the end point closest to the first starting point is a second starting point, and the end point closest to the first ending point is a second ending point. The distance between the first starting point and the second starting point is c1mm, and c1 satisfies: 20≤c1≤40. The distance between the first ending point and the second ending point is c2mm, and c2 satisfies: 20≤c2≤40.

8. The surgical prosthetic heart valve of claim 7, wherein, The distance between the first starting point and the second starting point is c1mm, and c1<1.5d1. The distance between the first ending point and the second ending point is c2mm, and c2<1.5d2.

9. The surgical prosthetic heart valve of claim 7 or 8, wherein, The c1 and the c2 satisfy the following relationship: c1=c2.

10. The surgical prosthetic heart valve of claim 1, wherein, The edges of the unstitched parts of the first valve leaflets are sequentially butted and jointed to form a first valve structure, the first valve structure forms a small hole at the center of the first valve, and the convex surface of each first valve leaflet faces the same side; The edges of the unstitched parts of the second valve leaflets are sequentially butted and jointed to form a second valve structure, the second valve structure forms a small hole at the center of the second valve, and the convex surface of each second valve leaflet faces the same side.

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