Medical device

Abstract

The present disclosure relates to a medical device for repairing a patient's heart valve. The medical device includes a pad configured to be located between a pair of leaflets of the valve. The pad has a pair of mating surfaces configured to face the pair of leaflets respectively, and as the pair of leaflets move, at least a portion of each mating surface periodically mates with and separates from the leaflet it faces. By means of the pad located between the pair of leaflets, the medical device provided by the present disclosure can improve the closing condition of the valve, enabling the valve to close properly, thereby effectively preventing or reducing blood reflux. In addition, the medical device provided by the present disclosure has less interference with blood flow, so the possibility of stenosis can be reduced. Moreover, the medical device provided by the present disclosure does not affect or less affects the movement of the leaflets, thus not or less bringing adverse effects to the structure and function of the leaflets.

Description

Technical Field

[0001] The present disclosure relates to the technical field of medical devices, and particularly to a medical device for repairing a patient's heart valve. Background Art

[0002] The heart valve refers to the valve between the atrium and the ventricle or between the ventricle and the artery. The valve plays a key role in the never - stopping blood circulation activity of the heart. After the blood flows through, the valve will close, thus preventing the blood from flowing back.

[0003] Several structural factors may affect the proper closing of the heart valve, thus causing blood reflux. Taking the mitral valve as an example, if the mitral valve cannot close properly, it will cause blood to flow from the left ventricle through the mitral valve to the left atrium during systole, thereby damaging the health of the patient. The repair devices provided by the related technologies have a clip - like structure, and this kind of repair device improves the closing condition of the valve by clamping on a pair of leaflets of the valve.

[0004] However, this kind of repair device has many disadvantages. For example, this kind of repair device will cause the effective area of blood flow through the valve to decrease, which may lead to another problem - stenosis. Also, this kind of repair device clamps a pair of leaflets together, making this pair of leaflets unable to naturally appose and separate with the cardiac cycle. Over time, this may cause problems to the structure and function of this pair of leaflets, and even to their related tissues, and even to the structure and function of the entire valve. Summary of the Invention

[0005] In view of this, the present disclosure provides a medical device for repairing a patient's heart valve.

[0006] The medical device provided by the present disclosure includes a pad, the pad is configured to be located between a pair of leaflets of the valve, the pad has a pair of apposing surfaces, the pair of apposing surfaces are configured to face a pair of leaflets respectively, and as the pair of leaflets move, at least a part of each apposing surface periodically apposes and separates from the leaflet it faces.

[0007] Through a pad located between a pair of leaflets, the medical device provided by the present disclosure can improve the closing condition of the valve, enabling the valve to close properly, thereby effectively preventing or reducing blood reflux. In addition, the medical device provided by the present disclosure causes less interference to blood flow, so the possibility of stenosis can be reduced. In addition, the medical device provided by the present disclosure does not affect or less affects the movement of the leaflets, thus not or less bringing adverse effects to the structure and function of the leaflets. That is to say, the valve can be periodically opened and closed through its own movement, and during systole, through the engagement of the pad and the leaflets, the effective closure of the leaflets is increased, so that not only can blood flow from the first chamber into the second chamber autonomously during diastole, but also the reverse flow during systole caused by the poor original apposition of the two leaflets can be effectively prevented.

[0008] In a possible implementation, each of the at least one apposition surface is configured to be recessed in a direction away from the leaflet it faces.

[0009] Configuring the apposition surface to be recessed in a direction away from the leaflet it faces can enable the apposition surface to better match the leaflet, so that the apposition surface can better appose with the leaflet.

[0010] In a possible implementation, the valve is used to allow blood to flow from the first chamber into the second chamber and prevent reverse flow. Each of the at least one apposition surface is configured to gradually extend towards the side where the leaflet it faces is located while tending towards the first chamber.

[0011] In some cases, there may still be a small amount of blood flowing back from the second chamber into the first chamber. Configuring the apposition surface to be recessed in a direction away from the leaflet it faces and gradually extending towards the side where the leaflet is located while tending towards the first chamber can change the flow direction of the blood flowing from the second chamber into the first chamber, guide the blood flow to one side, and avoid the blood flow directly facing the first chamber, thereby reducing the adverse effects of the reflux on the patient's cardiac function.

[0012] In a possible implementation, each of the at least one apposition surface has a first edge portion and a second edge portion respectively located at its opposite ends. The first edge portion is configured to be closer to the first chamber than the second edge portion, and the value range of the included angle formed by the section plane of the first edge portion and the section plane of the second edge portion is greater than or equal to 10 degrees and less than or equal to 45 degrees.

[0013] The larger the included angle formed by the section plane of the first edge portion and the section plane of the second edge portion, the greater the change in the flow direction of the blood flow from the second chamber into the first chamber. Setting the included angle between the two within this range can effectively guide the blood flow from the second chamber into the first chamber to one side on the basis of ensuring good apposition between the leaflet and the apposition surface.

[0014] In a possible implementation, the pad further has a top surface which is configured to face the first chamber and protrude towards the first chamber.

[0015] To better match a pair of leaflets, the thickness of the pad gradually increases towards the first chamber, which may cause blood to accumulate easily on the top of the pad. Configuring the top surface of the pad to protrude towards the first chamber can effectively avoid or reduce the accumulation of blood on the top of the pad.

[0016] In a possible implementation, the top surface is configured to gradually extend towards the second chamber starting from its middle part as it approaches the side where each leaflet is located.

[0017] This configuration of the top surface can effectively avoid or reduce the accumulation of blood on the top of the pad. In addition, this configuration of the top surface can also reduce the blockage of the blood flow from the first chamber to the second chamber by the pad, and better guide the blood flow from the first chamber into the second chamber.

[0018] In a possible implementation, the included angle between the section plane of the middle part of the top surface and the section plane of the edge part near each leaflet of the top surface ranges from greater than or equal to 10 degrees to less than or equal to 45 degrees.

[0019] In this way, the top surface can better guide the blood flow from the first chamber to the second chamber, thereby reducing the blockage of the blood flow from the first chamber to the second chamber.

[0020] In a possible implementation, the medical device further includes a support member which is configured to be located in the first chamber and connected to the pad, so as to position the pad between a pair of leaflets.

[0021] Through the support member placed in the first chamber, the pad can be reliably positioned between a pair of leaflets.

[0022] In a possible implementation, the support member has a main body part and a pair of extending parts which are configured to extend to both sides in the width direction of the pad respectively and be connected to the pad.

[0023] A pair of leaflets are located on both sides in the thickness direction of the pad, the first chamber and the second chamber are located on both sides in the height direction of the pad, and the thickness direction, height direction and width direction of the pad are perpendicular to each other pairwise. When the valve opens, most of the blood will flow along the height direction from both sides in the thickness direction of the pad and finally flow into the second chamber. Since most of the blood will flow from both sides in the thickness direction of the pad, this configuration of the support member can greatly reduce the obstruction of the blood flow by the part where the support member is connected to the pad, thereby reducing the adverse impact of the medical device on the normal physiological functions of the patient.

[0024] In a possible implementation, the pad includes a stretchable wire frame and a cover covering the outside of the wire frame.

[0025] The shape and size of the pad mainly depend on the grid. During the delivery process, the grid can be folded to reduce the overall size of the pad, making the delivery process easier. After the pad is delivered to the target position, the grid can be unfolded so that the pad has the appropriate size and shape. In addition, this structure with the grid enables the doctor to adaptively adjust the shape and size of the pad according to the differences in the valves of different patients, so that the pad can better match the patient's valve. The cover wrapped around the outside of the grid can provide a smooth surface for the pad, on the one hand, avoiding or reducing tissue overgrowth and blood adsorption on the pad, and on the other hand, enabling the pad to fit more closely with the leaflets. Description of the Drawings

[0026] To more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings required for use in the embodiments will be briefly introduced below.

[0027] It should be understood that the following drawings only show some embodiments of the present disclosure, and thus should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

[0028] It should be understood that the same or similar reference numerals are used in the drawings to represent the same or similar elements (components or parts).

[0029] It should be understood that the drawings are only schematic, and the sizes and proportions of the elements (components or parts) in the drawings are not necessarily accurate.

[0030] Figure 1 is a schematic structural diagram of a medical device according to an embodiment of the present disclosure.

[0031] Figure 2 is a schematic structural diagram of a medical device according to another embodiment of the present disclosure.

[0032] Figure 3A and Figure 3B is Figure 2 a schematic structural diagram of the pad of the medical device in

[0033] Figure 4 is Figure 2 an axonometric structural diagram of the medical device in

[0034] Figure 5 is a schematic structural diagram of the pad of a medical device according to another embodiment of the present disclosure. Detailed Description of the Embodiments

[0035] To enable those skilled in the art to better understand the technical solutions in this disclosure, the following will clearly and completely describe the technical solutions in the embodiments of this disclosure in conjunction with the accompanying drawings in the embodiments of this disclosure. Obviously, the described embodiments are only a part of the embodiments of this disclosure, rather than all of the embodiments. Based on the embodiments in this disclosure, all other embodiments obtained by those of ordinary skill in the art shall fall within the scope of protection of this disclosure.

[0036] Figure 1 is a schematic structural diagram of a medical device 10 according to an embodiment of the present disclosure. Figure 1 shows the state where the medical device 10 is placed at the heart valve of a patient.

[0037] In Figure 1 (and other accompanying drawings of the present disclosure), the heart valve is located between a first chamber and a second chamber and is configured to allow blood flow to flow from the first chamber into the second chamber and prevent the reverse flow. The heart valve includes a pair of matching leaflets FL, SL.

[0038] Normally, the leaflets FL, SL can naturally coapt to close the valve and separate to open the valve during the cardiac cycle, thereby allowing blood to flow from the first chamber into the second chamber and preventing the reverse flow. However, for patients with valvular insufficiency, when the valve needs to be closed, the leaflets FL, SL cannot achieve proper coaptation. For example, the amplitude of coaptation is significantly reduced, or there is even a gap between the two, such that blood flow can pass through the valve from the second chamber into the first chamber, resulting in a regurgitation phenomenon during systole.

[0039] Figure 1 (and other accompanying drawings of the present disclosure), the valve can be a mitral valve. Correspondingly, the first chamber is the left atrium, the second chamber is the left ventricle, and one of the leaflets FL, SL is the anterior leaflet and the other is the posterior leaflet. It should be understood that the medical device provided in the present disclosure is not limited to being applied to the mitral valve and can also be applied to other heart valves.

[0040] See Figure 1, the medical device 10 includes a pad 11. When the medical device 10 is placed in a patient's heart, the pad 11 is located between the leaflets FL and SL. The pad 11 has a pair of mating surfaces 111, 112. When the medical device 10 is placed in a patient's heart, the pair of mating surfaces 111, 112 face a pair of leaflets FL, SL respectively, that is, the mating surface 111 faces the leaflet FL and the mating surface 112 faces the leaflet SL. With the change of the cardiac cycle, each of the pair of mating surfaces 111, 112 mates (coaptation) and separates from the leaflet it faces periodically. Specifically, when the valve closes, the mating surface 111 mates with the leaflet FL and the mating surface 112 mates with the leaflet SL to prevent blood from flowing back from the second chamber to the first chamber; when the valve opens, the leaflets FL, SL separate from the mating surfaces 111, 112 respectively to allow blood to flow from the first chamber into the second chamber. In one example, the coaptation length of each mating surface with its corresponding leaflet can range from 6 to 12 millimeters. In one example, the mating surfaces 111, 112 can be smoothly transitioning curved surfaces to reduce the resistance to blood flow.

[0041] In this implementation, through the pad located between a pair of leaflets, the medical device can improve the closing condition of the valve, enabling a pair of leaflets of the valve to mate properly, thereby effectively preventing or reducing blood reflux. In addition, in this implementation, the medical device has less interference with blood flow, so the possibility of stenosis can be reduced. In addition, in this implementation, the medical device does not affect or less affects the movement of the leaflets, thus not causing or less causing problems to the structure and function of the leaflets.

[0042] Refer back to Figure 1 , the medical device 10 may further include a support member 12. When the medical device 10 is placed in a patient's heart, the support member 12 is located in the first chamber and connected to the pad 11, thereby positioning the pad 11 between a pair of leaflets SL, FL. Through the support member 12 placed in the first chamber, the pad 11 can be reliably positioned between a pair of leaflets FL, SL. In one example, the pad 11 can be rigidly connected to the support member 12 to keep the pad 11 in a proper position all the time, avoiding the change of the position of the pad 11 under the influence of blood flow or the leaflets FL, SL. If the pad 11 cannot be kept in a proper position, it cannot be ensured that a pair of leaflets FL, SL can mate well with a pair of mating surfaces 111, 112 every time the valve closes.

[0043] There are various implementation manners of the support member, and the present disclosure does not make specific limitations thereon.

[0044] As an example, refer back to Figure 1, the support member 12 can be annular. When the medical device 10 is installed in a patient's heart, the support member 12 can be disposed at the annulus of the heart. In some embodiments, the support member 12 can have a grid structure. During delivery, the support member 12 can be folded first to reduce its volume, making the delivery process easier; after the support member 12 is delivered to the target position, it can be unfolded again.

[0045] It can be understood that the implementation manner of the support member is not limited to the above, as long as it can achieve positioning the pad between a pair of leaflets of the valve. For example, in some embodiments, the support member can also be semi-annular or partially annular. In some embodiments, the support member can be made of a flexible material so as to deform following the contraction and relaxation of the first chamber, thereby reducing the negative impact on the physiological function of the heart.

[0046] Figure 2 is a schematic structural diagram of a medical device 20 according to another embodiment of the present disclosure. Figure 2 shows the state where the medical device 20 is placed at a patient's heart valve.

[0047] See Figure 2 , the medical device 20 includes a pad 21. In some embodiments, the pad 21 can be configured to gradually increase in thickness towards the first chamber, so as to better match the shape of a pair of leaflets FL, SL and better achieve the closure of the valve.

[0048] When the medical device 20 is disposed in a patient's heart, the pad 21 is located between the first pair of leaflets FL, SL. The pad 21 has a pair of mating surfaces 211, 212. When the medical device 20 is disposed in a patient's heart, the pair of mating surfaces 211, 212 face the pair of leaflets FL, SL respectively, and as the pair of leaflets FL, SL move, each of the pair of mating surfaces 211, 212 periodically mates and separates from the leaflet it faces.

[0049] The mating surfaces 211, 212 can both be concave surfaces. In particular, when the medical device 20 is disposed in a patient's heart, the mating surface 211 can be recessed in a direction away from the leaflet it faces (i.e., leaflet FL); the mating surface 212 can be recessed in a direction away from the leaflet it faces (i.e., leaflet SL).

[0050] In this way, it can enable the mating surface to better match the leaflet it faces, so that the mating surface mates better with the leaflet it faces.

[0051] As an example, referring back to Figure 2 , when the medical device 20 is disposed in a patient's heart, the mating surface 211 can be configured to gradually move towards the first chamber and towards the side where the leaflet FL it faces is located (i.e., Figure 2extends to the left side in [reference]; the apposing surface 212 can be configured to gradually extend towards the first chamber and towards the side where the facing lobule SL is located (i.e., Figure 2 the right side in [reference]).

[0052] In some cases, there may still be a small amount of blood flowing back from the second chamber into the first chamber. Configuring the apposing surface to be concave in the direction away from the facing lobule and gradually extending towards the side where the lobule is located can change the flow direction of the blood flowing from the second chamber to the first chamber, guiding the blood flow to one side and avoiding the blood flow directly facing the first chamber, thereby being able to reduce the direct "impact" of the regurgitation on the patient's atrium and pulmonary veins and reducing the impact on cardiac function.

[0053] Figure 3A is a schematic structural diagram of the pad 21. In Figure 3A it, the thick arrows are used to schematically indicate the changing trend of the flow direction of the blood flowing from the second chamber to the first chamber under the guidance of the apposing surfaces 211, 212.

[0054] See Figure 2 and Figure 3A , the apposing surface 211 has a first edge portion 211a and a second edge portion 211b located at its opposite ends respectively. When the medical device 20 is placed in the patient's heart, the first edge portion 211a is closer to the first chamber than the second edge portion 211b. The section plane of the apposing surface 211 tends towards the first edge portion 211a and the included angle with the section plane at the second edge portion 211b gradually increases. The value range of the included angle (acute angle) α1 formed by the section plane of the first edge portion 211a and the section plane of the second edge portion 211b can be greater than or equal to 10 degrees and less than or equal to 45 degrees. Preferably, the value range of α1 can be greater than or equal to 15 degrees and less than or equal to 30 degrees.

[0055] The apposing surface 212 has a first edge portion 212a and a second edge portion 212b located at its opposite ends respectively. When the medical device 20 is placed in the patient's heart, the first edge portion 212a is closer to the first chamber than the second edge portion 212b. The section plane of the apposing surface 212 tends towards the first edge portion 212a and the included angle with the section plane at the second edge portion 212b gradually increases. The value range of the included angle (acute angle) α2 formed by the section plane of the first edge portion 212a and the section plane of the second edge portion 212b is greater than or equal to 10 degrees and less than or equal to 45 degrees. The included angle α1 and the included angle α2 can be equal or not equal, and the present disclosure does not make specific limitations thereon.

[0056] The larger the included angle formed by the cross-section of the first edge portion and the cross-section of the second edge portion, the greater the change in the flow direction of the blood flow from the second chamber to the first chamber by the mating surface. Setting the included angle between the two within the range of 10 degrees to 45 degrees can effectively guide the blood flow from the second chamber to the first chamber to one side on the basis of ensuring good mating between the leaflets and the mating surface.

[0057] Refer back to Figure 2 , the pad 21 may also have a top surface 213, and the top surface 213 may be a convex surface. In particular, when the medical device 20 is placed in a patient's heart, the top surface 213 of the pad 21 is located at one end of the pad close to the first chamber, and the top surface 213 faces the first chamber and protrudes into the first chamber.

[0058] To better match a pair of leaflets of the valve, the thickness of the pad may be configured to gradually increase towards the first chamber, which may cause blood to accumulate easily at the top of the pad. In the above implementation of the present disclosure, since the pad has a top surface that protrudes (in the direction of the first chamber), it can effectively avoid or reduce the accumulation of blood at the top of the pad.

[0059] In one example, refer back to Figure 2 , when the medical device 20 is placed in a patient's heart, the top surface 213 of the pad 21 may be configured to gradually extend towards the second chamber starting from its middle as it approaches each side where the leaflets FL, SL are located.

[0060] Specifically, as Figure 2 shown, the top surface 213 gradually extends towards the second chamber (i.e., gradually extends downward in Figure 2 the left side in Figure 2 ) starting from its middle as it approaches the side where the leaflet FL is located; and the top surface 213 gradually extends towards the second chamber (i.e., gradually extends downward in Figure 2 the right side in Figure 2 ) starting from its middle as it approaches the side where the leaflet SL is located. That is to say, the top surface 213 has a structure that is high in the middle and low at both ends.

[0061] This structure of the top surface can effectively avoid or reduce the accumulation of blood at the top of the pad. In addition, this structure of the top surface can also reduce the blockage of the blood flow from the first chamber to the second chamber by the pad and better guide the blood flow from the first chamber into the second chamber.

[0062] Figure 3B is a schematic structural diagram of the pad 21. In Figure 3B , the thick arrow is used to schematically indicate the change trend of the flow direction of the blood flow from the first chamber to the second chamber under the guidance of the top surface 213 of the pad 21.

[0063] Refer to Figure 2 and Figure 3B At both ends of the top surface 213 in the thickness direction of the pad 21, there are edge portions 213a and 213b respectively. When the medical device 10 is installed in a patient's heart, the edge portion 213a is closer to the leaflet FL (or closer to the mating surface 211) relative to the edge portion 213b, and the edge portion 213b is closer to the leaflet SL (or closer to the mating surface 212) relative to the edge portion 213a.

[0064] Define the included angle between the section plane at the middle portion 213c of the top surface 213 and the section plane at the edge portion 213a as β1, and define the included angle between the section plane at the middle portion 213c and the section plane at the edge portion 213b as β2. The value ranges of the included angles β1 and β2 can be set to be greater than or equal to 10 degrees and less than or equal to 45 degrees. Preferably, the value range of β1 is greater than or equal to 15 degrees and less than or equal to 30 degrees. In one example, the top surface 213 can be a smoothly transitioning curved surface to reduce the resistance to blood flow.

[0065] This structure of the top surface can better guide the blood flow from the first chamber to the second chamber, thereby reducing the obstruction of the blood flow from the first chamber to the second chamber.

[0066] Figure 4 is an axonometric schematic view of the medical device 20.

[0067] It should be noted that in the drawings of the present disclosure, the arrow X is used to indicate the width direction of the pad, the arrow Y is used to indicate the thickness direction of the pad, and the arrow Z is used to indicate the height direction of the pad.

[0068] Refer to Figure 4 The support member 22 includes a main body portion 221 and a pair of connecting portions 222. As an example, the main body portion 221 can be annular and is configured to be suitable for installation at the valve annulus. Of course, in other examples, the main body portion 221 can also be semi-annular or of other shapes. The pair of connections 222 respectively extend to both sides in the width direction of the pad 21 and are connected to the pad 21.

[0069] A pair of leaflets are located on both sides in the thickness direction of the pad, the first chamber and the second chamber are located on both sides in the height direction of the pad, and the thickness direction, height direction, and width direction of the pad are perpendicular to each other pairwise. When the valve opens, most of the blood will flow through from both sides in the thickness direction of the pad along the height direction and finally flow into the second chamber. Since most of the blood will flow through from both sides in the thickness direction of the pad, this structure of the support member can greatly reduce the obstruction of the part where the support member is connected to the pad to the blood flow, thereby reducing the impact of the medical device on the normal physiological functions of the patient.

[0070] Figure 5 is a schematic view of the structure of the pad 31 of the medical device according to an embodiment of the present disclosure.

[0071] See Figure 5 Figure 5 , the pad 31 includes an extensible grid 31a and a cover 31b covering the grid 31a. A pair of mating surfaces 311, 312 and a top surface 313 can be part of the outer surface of the cover 31b. In one example, the cover 31b can be made of a biocompatible material and have a smooth outer surface to avoid or reduce wear on the leaflets or cause discomfort when mating with the leaflets. Another implementation can be that the cover 31b is only at the top of the pad but does not cover the mating surface. This can allow the mating surface to epithelialize faster and reduce the impact on the leaflet tissue when the leaflets and the mating surface come into contact with each other.

[0072] The shape and size of the pad mainly depend on the grid. During delivery, the grid can be folded to reduce the overall size of the pad, making the delivery process easier. After the pad is delivered to the target location, the grid can be unfolded so that the pad has a suitable size and shape. In addition, this structure with a grid enables the doctor to adaptively adjust the shape and size of the pad according to the differences in the valves of different patients, so that the pad can better match the patient's valve. The cover covering the outside of the grid can provide a smooth surface for the pad, thus on the one hand avoiding or reducing tissue overgrowth and blood adsorption on the pad, and on the other hand enabling the pad to fit more tightly with the leaflets.

[0073] It should be understood that the term "including" and its variants used in this disclosure are open-ended, that is, "including but not limited to". The term "one embodiment" means "at least one embodiment", and the term "another embodiment" means "at least one additional embodiment".

[0074] It should be understood that although terms such as "first" or "second" may be used in this disclosure to describe various elements (such as the first chamber and the second chamber), these elements are not limited by these terms, and these terms are only used to distinguish one element from another.

[0075] It should be noted that for the various specific technical features (elements) described in the above specific embodiments, they can be combined in any appropriate manner without conflict. To avoid unnecessary repetition, this disclosure will not separately describe various possible combination methods.

[0076] It should be understood that multiple components and / or parts can be provided by a single integrated component or part. Alternatively, a single integrated component or part can be divided into separate multiple components and / or parts. The disclosure of "a" or "one" used to describe a component or part does not mean to exclude other components or parts.

[0077] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs. The terms used herein in the specification of this disclosure are for the purpose of describing particular embodiments only and are not intended to limit this disclosure. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0078] As described above, the foregoing are only specific embodiments of this disclosure, but the protection scope of this disclosure is not limited thereto. Any person skilled in the art within the technical scope disclosed by this disclosure can conceive of changes or substitutions, which should be covered within the protection scope of this disclosure. Therefore, the protection scope of this disclosure shall be subject to the protection scope of the claims.

Claims

1. A medical device for repairing a valve of a patient, the valve being for allowing blood to flow from a first chamber into a second chamber and preventing flow in the opposite direction, characterized in that, The medical device includes a pad configured to be located between a pair of leaflets of the valve. The pad has a pair of mating surfaces configured to face the pair of leaflets respectively. As the pair of leaflets move, each mating surface periodically mates with and separates from the leaflet it faces. Each mating surface is configured to be recessed in a direction away from the leaflet it faces and is configured to gradually extend toward the first chamber and toward the side where the leaflet it faces is located.

2. The medical device according to claim 1, wherein Each mating surface has a first edge portion and a second edge portion located at opposite ends thereof respectively. The first edge portion is configured to be closer to the first chamber relative to the second edge portion. The included angle between the section plane of the first edge portion and the section plane of the second edge portion ranges from greater than or equal to 10 degrees to less than or equal to 45 degrees.

3. The medical device according to claim 2, characterized in that, The included angle between the section plane of the first edge portion and the section plane of the second edge portion ranges from greater than or equal to 15 degrees to less than or equal to 30 degrees.

4. The medical device according to claim 1, wherein The valve is configured to allow blood to flow from the first chamber into the second chamber and prevent reverse flow. The pad further has a top surface configured to face the first chamber and protrude toward the first chamber.

5. The medical device according to claim 4, wherein, The top surface is configured to gradually extend toward the second chamber starting from its middle part and toward the side where each leaflet is located.

6. The medical device according to claim 5, wherein the included angle between the section plane of the middle part of the top surface and the section plane of the edge portion of the top surface close to each leaflet ranges from greater than or equal to 10 degrees to less than or equal to 45 degrees.

7. The medical device according to claim 1, characterized in that, The valve is configured to allow blood to flow from the first chamber into the second chamber and prevent reverse flow. The medical device further includes a support member configured to be located in the first chamber and connected to the pad, thereby positioning the pad between the pair of leaflets.

8. The medical device according to claim 7, wherein The support member has a main body portion and a pair of extending portions configured to extend to both sides in the width direction of the pad and be connected to the pad respectively.

9. The medical device according to claim 8, characterized in that, The support member is annular, made of a flexible material, and has a grid structure.

10. The medical device according to claim 1, wherein The pad includes an extensible grid and a cover covering the outside of the grid.

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