A valve clip device with a plugging function

Abstract

The present invention discloses a valve clip with a plugging function, which includes an upper clip assembly, a lower clip assembly, a base, a locking mechanism, a connecting rod arm and a plugging mesh; the upper clip assembly and the lower clip assembly are equal in number and are matched in opening and closing to form a clamping part. The lower part of the upper clip assembly is fixedly arranged on one side of the locking mechanism, and the lower clip assembly is movably connected to the locking mechanism and is located below the upper clip assembly; the plugging mesh is arranged on the other side of the locking mechanism, that is, on both sides of the clamping part; when the upper clip assembly and the lower clip assembly are clamped, the plugging mesh is in an open state to plug the gaps on both sides of the clamping part. The valve clip effectively prevents the residual backflow leakage beside the clips after the edge-to-edge valve clip repair by arranging the plugging mesh on both sides of the clamping part, and plays a better role in reducing mitral regurgitation; through the application of the clip, the operation time can be effectively shortened, and the operation difficulty, operation risk and medical cost are reduced.

Description

Technical Field

[0001] The present invention relates to the field of medical devices, and particularly to a valve clip with a blocking function. Background Art

[0002] The mitral valve, i.e., the left atrioventricular valve, also known as the "mitral valve", is attached to the left fibrous atrioventricular ring. A normal mitral valve consists of an annulus, leaflets, chordae tendineae, and papillary muscles. The integrity of the mitral valve function requires that the size of the mitral valve annulus is appropriate, the leaflet structure is intact, the papillary muscles contract to pull the chordae tendineae to play a supporting role for the leaflets, the left ventricular muscle contraction generates an appropriate closing force, and the ventricular shape and function are normal. These factors together determine the integrity of the mitral valve, and any abnormality in any one factor will lead to mitral regurgitation. Therefore, mitral regurgitation (MR) is the most common heart valve disease.

[0003] In recent years, with the development of technology, domestic and foreign medical device manufacturers have developed a batch of interventional devices for the treatment of mitral regurgitation. The corresponding treatment or repair techniques mainly include edge-to-edge repair technique, annuloplasty, annuloplasty, chordae tendineae implantation technique, etc. Among them, the edge-to-edge repair technique has a long history and better safety, and currently leads other repair techniques. Abbott MitraClip and Edwards PASCAL are typical representatives. MitraClip is inserted through a transcatheter femoral vein puncture and through an atrial septum puncture, and the clip is sent from the atrium down to near the mitral valve, and the free edges of the anterior and posterior leaflets are clamped and fixed. The mitral valve is clipped into a double orifice with the clip, so that the leaflets are well apposed at the end of systole, reducing regurgitation. Edwards PASCAL also performs a femoral vein puncture and a transcatheter atrial septum puncture, and uses a clip to clip the mitral valve into a double orifice, but has a unique ability to separately capture the leaflets. Another example is a retrievable valve clip and a valve clip retrieval system disclosed in Chinese Patent CN 211325891 U, both of which are used for the surgical treatment of the mitral valve or tricuspid valve.

[0004] However, due to the limited clamping range of a single clip, and the mitral regurgitation range of patients is often relatively wide, there will still be regurgitation leakage problems on both sides of the clip after using the edge-to-edge repair techniques of MitraClip, PASCAL and Chinese Patent CN211325891U to clamp the mitral valve. Therefore, multiple clips are often used clinically to achieve good results, which increases the surgical difficulty and risk, and also increases the medical cost. Summary of the Invention

[0005] In order to overcome the deficiencies of the prior art, the purpose of the present invention is to provide a new type of auxiliary device to reduce the difficulty and risk of mitral valve surgery, and specifically provide a valve clip with a blocking function, which can solve the problem of regurgitation leakage on both sides existing in traditional clips.

[0006] The object of the present invention is achieved by the following technical solutions:

[0007] A valve clip, the valve clip comprising an upper clip assembly, a lower clip assembly, a base, a locking mechanism and a blocking braided net; the number of the upper clip assembly and the lower clip assembly is equal and they are opened and closed in a matching manner to form a clamping part; the base comprises a base body and base support rods, and the base support rods are vertically arranged on the upper surface of the base body; the locking mechanism is movably sleeved on the base support rods and the bottom is supported on the upper surface of the base body; the lower part of the upper clip assembly is fixedly arranged on one side surface of the locking mechanism, and the lower clip assembly is movably connected to the locking mechanism and is located below the upper clip assembly; the blocking braided net is arranged adjacent to the upper clip assembly on the other side surface of the locking mechanism, that is, on both sides of the clamping part; when the upper clip assembly and the lower clip assembly are clamped, the blocking braided net is in an open state to block the gaps on both sides of the clamping part.

[0008] Preferably, the upper clip assembly comprises an elastic upper clip plate with shape memory function, at least one threading hole is opened on the plate body of the elastic upper clip plate, and a rough structure is arranged on the surface of the elastic upper clip plate facing the lower clip assembly, and the rough structure comprises a tooth-shaped structure, a barbed structure or a convex structure.

[0009] Preferably, the upper clip assembly further comprises an upper clip connecting bottom plate, one elastic upper clip plate is arranged at each end of the upper clip connecting bottom plate, the upper clip connecting bottom plate and the elastic upper clip plates at both ends are integrally arranged in a concave structure, and an upper clip through hole is opened in the middle of the upper clip connecting bottom plate, upper clip guiding and limiting holes are opened through the lower parts of the two elastic upper clip plates, the upper surface of the upper clip connecting bottom plate is attached to the bottom surface of the locking mechanism, and the inner side surfaces of the lower parts of the two elastic upper clip plates are attached to the outer side surfaces of the locking mechanism.

[0010] Preferably, the elastic upper clip plate with shape memory function has a preset expansion angle α, and α = 30 - 135°, preferably 90°.

[0011] Preferably, the lower clip assembly comprises a lower clip bottom plate and lower clip side plates vertically arranged on both sides of the lower clip bottom plate, and a receiving cavity for cooperating with the upper clip assembly is formed by the lower clip bottom plate and the lower clip side plates; the lower parts of the lower clip side plates are connected with an outer expansion plate and a hinge plate, and the hinge plate after expansion is movably connected to the locking mechanism.

[0012] Preferably, a hinge hole is opened through the hinge plate for connecting the lower clip assembly and the locking mechanism; a linkage hole is opened on the outer expansion plate; a bottom plate leakage port is opened on the lower clip bottom plate.

[0013] Preferably, the valve clip also includes a connecting rod arm, which includes a connecting rod bottom plate and a connecting rod side plate vertically arranged perpendicular to the side of the connecting rod bottom plate. The lower part of the connecting rod side plate is movably connected to the base body of the base, and the upper part of the connecting rod side plate is movably connected to the linkage hole of the lower clip assembly, thereby forming a four-bar linkage mechanism, and the accommodation groove formed by the connecting rod bottom plate and the connecting rod side plate is accommodated and matched with the lower outer contour of the lower clip assembly.

[0014] Preferably, the upper edges inside of the lower clip bottom plate and the lower clip side plate are rounded or flanged with an outward arc extension.

[0015] Preferably, the locking mechanism includes a locking seat, a control elastic member, a locking elastic piece, and a locking flat plate. A hollow locking accommodation cavity is opened at the lower part of the locking seat. An inclined surface boss is obliquely protruded into the cavity on a side wall of the locking accommodation cavity. The inclined surface boss is used to accommodate the locking flat plate. The bottom surface of the locking elastic piece abuts against the upper surface of the locking flat plate. The bottom of the control elastic member is embedded in the locking accommodation cavity, and the upper part of the control elastic member extends upward along the periphery of the locking seat.

[0016] Preferably, an expandable sealing body is provided inside and / or on the surface of the sealing braid. The sealing body fills or covers the sealing braid during the opening process of the sealing braid, so as to fill the gap of the valve clip to block or cut off the backflow.

[0017] Preferably, the sealing braid is made of a nickel-titanium material with a memory function, and the pores of the sealing body when the sealing braid is opened are smaller than the outer diameter of the backflow fluid.

[0018] Preferably, the upper clip assembly includes two elastic upper clip plates and is relatively arranged on both sides of the locking mechanism. Two lower clip assemblies are correspondingly arranged. The sealing braid is arranged on both sides of the middle connection of the two elastic upper clip plates or the lower clip assemblies, and the sealing braid presents shapes including but not limited to an 8-shaped, oval, triangular, ingot-shaped, pillow-shaped, saddle-shaped, spherical, trumpet-shaped, or irregular shape.

[0019] Preferably, the sealing braid is connected to the lower clip assembly and / or the base, and the connection methods include but are not limited to riveting, welding, and threaded connection; wherein, the sealing braid is an alloy with a shape memory function or a biodegradable polymer material.

[0020] Preferably, the alloy includes but is not limited to nickel-titanium alloy and magnesium alloy with a shape memory function, and the polymer material includes biodegradable poly-L-lactic acid.

[0021] Preferably, a biocompatible coating film is coated on the outer surfaces of the upper clip assembly, the lower clip assembly, the base, and the locking mechanism.

[0022] Preferably, the rough structure is a row of saw teeth or barbs obliquely cut from two side edges of the elastic upper splint body.

[0023] It should be noted that in this solution, the concepts of "end part", "upper part", and "lower part" all refer to the relative positions with respect to the surgical operator during the valve operation, judged according to their positions during normal use. The preset expansion angle, etc. refer to the shape or angle presented by the structure in its natural state without external force after pre - processing. The so - called "elasticity" refers to a material that deforms when a force is applied and returns to its original shape after the acting force is removed.

[0024] There are also existing optional technical means such as a coupling mechanism, a delivery sheath, a push rod, etc. that are adapted to the structure of the clamp body of this solution, which will not be elaborated in detail in this solution.

[0025] Compared with the prior art, the beneficial effects of the present invention are as follows: By arranging a sealing device structure on both sides of the clip, the valve clip effectively prevents residual backflow leakage on both sides of the clip after edge - to - edge valve clip repair, achieving a better effect of reducing mitral regurgitation; the clip can be implanted through the atrial septum via the femoral vein in a minimally invasive manner to repair the mitral valve and complete the operation in a state of non - cardiopulmonary bypass, forming an effective double - orifice structure; through the application of this clip, the operation time can be effectively shortened, the degree of trauma can be reduced, and the operation difficulty, operation risk, and medical cost can be reduced. At the same time, this clip can also be used for tricuspid regurgitation. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of a valve clip in an initial state with the occlusive braid being ellipsoidal;

[0027] Figure 2 It is for Figure 1 a top view of the closed state of the valve clip in use;

[0028] Figure 3 It is a schematic diagram of a valve clip in an initial state with the occlusive braid being triangular;

[0029] Figure 4 It is a schematic diagram of a valve clip in an initial state with the occlusive braid being a cylindrical or trumpet - shaped structure with different thicknesses;

[0030] Figure 5 It is a schematic diagram of the initial state structure of a valve clip with an open - state occlusive braid;

[0031] Figure 6 It is for Figure 5 a schematic diagram of the structure after removing the lower clip assembly and the occlusive braid on one side;

[0032] Figure 7 It is for Figure 5Schematic diagram of the structure for removing the plugging woven net, lower clamping assembly and connecting rod arm;

[0033] Figure 8 Is the upward view of the base;

[0034] Figure 9 Is Figure 5 Exploded view of the structure of;

[0035] Figure 10 Schematic diagram of the upper clamping assembly opened to a state close to 90°;

[0036] Figure 11 Schematic diagram of the structure where the plugging woven net is spherical;

[0037] Figure 12 Schematic diagram of the structure where the plugging woven net is conical or triangular;

[0038] Figure 13 Schematic diagram of the plugging woven net being pillow-shaped. Specific implementation manners

[0039] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0040] A valve clip, see Figures 1-13 , comprising an upper clamping assembly 1, a lower clamping assembly 2, a base 3, a locking mechanism 4, a plugging woven net 5 and a connecting rod arm 6.

[0041] Among them, the lower clamping assembly 2, the base 3, the locking mechanism 4 and the connecting rod arm 6 form a four-bar linkage mechanism, making the opening and closing of the valve clip easier to operate.

[0042] Among them, the number of the upper clamping assembly 1 and the lower clamping assembly 2 is equal and their opening and closing are matched. Preferably, two sets of the upper clamping assembly 1 and the lower clamping assembly 2 are respectively provided and symmetrically and movably connected to both sides of the locking mechanism 4. Of course, multiple sets can also be set according to actual needs.

[0043] Among them, the base 3 includes a base body 31 and a base support rod 32. The base support rod 32 is vertically arranged on the upper surface of the base body 31. Two base connection holes 33 are arranged on the side surface of the base body 31, and a base threaded hole 34 is arranged on the bottom surface of the base 31.

[0044] The locking mechanism 4 is sleeved on the base support rod 32 and its bottom is supported on the upper surface of the base body 31; the lower part of the upper clamping assembly 1 is fixedly arranged on one side of the locking mechanism 4, and the lower clamping assembly 2 is movably connected to the locking mechanism 4 and is located below the upper clamping assembly 1.

[0045] The blocking braid net 5 is arranged adjacent to the upper clamping assembly 1 on the other side of the locking mechanism 4, that is, on two sides of the four-bar linkage mechanism; when the upper clamping assembly 1 and the lower clamping assembly 2 are clamped, the blocking braid net 5 is in an open state to block the gaps on both sides of the four-bar linkage.

[0046] The upper clamping assembly 1 includes an elastic upper clamping plate 11 with shape memory function. At least one threading hole 12 is opened on the plate body of the elastic upper clamping plate 11. A rough structure 14 is arranged on the surface of the elastic upper clamping plate 11 facing the lower clamping assembly 2. The rough structure includes a tooth-shaped structure, a barbed structure or a convex structure.

[0047] Among them, the threading hole 12 is used for threading a wire (not introduced here) for fine adjustment during the operation, etc.

[0048] In one embodiment, the rough structure 14 is a row of sawteeth or a row of barbs obliquely cut from two side edges of the plate body of the elastic upper clamping plate 11. The rough structure 14 is used to improve the clamping force on the target tissue during clamping and enhance the stability during the operation.

[0049] The protrusions of the rough structure 14 can increase in length, decrease in length, remain unchanged, etc. successively from bottom to top, or can be arranged in an alternating long and short pattern at intervals.

[0050] The upper clamping assembly 1 further includes an upper clamping connection bottom plate 13. One elastic upper clamping plate 11 is arranged at each end of the upper clamping connection bottom plate 13. The upper clamping connection bottom plate 13 and the elastic upper clamping plates 11 at both ends are integrally arranged in a concave structure. An upper clamping through hole 15 is opened in the middle of the upper clamping connection bottom plate 13. Upper clamping guiding and limiting holes 16 are opened through the lower parts of the two elastic upper clamping plates 11. The upper surface of the upper clamping connection bottom plate 13 is attached to the bottom surface of the locking mechanism 4, and the inner side surfaces of the lower parts of the two elastic upper clamping plates 11 are attached to the outer side surface of the locking mechanism 4.

[0051] Furthermore, the elastic upper clamping plate 11 with shape memory function has a preset expansion angle α. When the upper clamping assembly 1 is compressed outward and downward from the contracted state close to the lower clamping assembly 2, the preset expansion angle α gradually becomes smaller. Generally, the preset expansion angle α is 30-135°, preferably 90°.

[0052] Among them, the lower clamping assembly 2 includes a lower clamping bottom plate 21 and lower clamping side plates 22 vertically arranged on both sides of the lower clamping bottom plate 21. An accommodation cavity for cooperating with the upper clamping assembly 1 is formed by the lower clamping bottom plate 21 and the lower clamping side plates 22; the lower part of the lower clamping side plate 22 is connected to an outwardly expanding plate 23 and a hinged plate 24, and is movably connected to the locking mechanism 4 through the outwardly expanded hinged plate 24.

[0053] Furthermore, the inner edges of the upper edges of the lower clamping bottom plate 21 and the lower clamping side plates 22 are rounded or turned over with an outward arc extension to reduce the damage to tissues by the plate edges or ends.

[0054] A hinged hole 25 is penetrated through the hinged plate 24 for connecting the lower clamping assembly 2 and the locking mechanism 4; a linkage hole 26 is formed on the outwardly expanding plate 23; a bottom plate leakage port 27 is formed on the lower clamping bottom plate 21.

[0055] In the accommodation cavity, protrusions in the form of strips or the like can be provided to make the clamping more stable.

[0056] The valve clamp also includes a connecting rod arm 6. The connecting rod arm 6 includes a connecting rod bottom plate 61 and connecting rod side plates 62 vertically arranged perpendicular to the side edges of the connecting rod bottom plate 61. The lower part of the connecting rod side plates 62 is movably connected to the base body 31 of the base 3, and the upper part of the connecting rod side plates 62 is movably connected to the linkage hole 26 of the lower clamping assembly 2, thereby forming a four-bar linkage mechanism, and the accommodation groove formed by the connecting rod bottom plate 61 and the connecting rod side plates 62 is accommodated and matched with the lower outer contour of the lower clamping assembly 2.

[0057] The connecting rod arm 6 further includes a connecting rod hinged hole 63 formed in the lower part of the connecting rod side plates 62, a connecting rod linkage hole 64 formed in the upper part of the connecting rod side plates 62, and a connecting rod leakage port 65 formed on the connecting rod bottom plate 61.

[0058] The lower parts of the two connecting rod side plates 62 are movably connected to the two base connection holes 33 of the base 3 through the connecting rod hinged hole 63, such as hinged connection, pivot connection, etc.

[0059] Similarly, the inner edges of the upper edges of the connecting rod bottom plate 61 and the connecting rod side plates 62 of the connecting rod arm 6 are rounded or turned over with an outward arc extension to reduce the damage to tissues by the plate edges or ends.

[0060] Among them, the above-mentioned bottom plate leakage port 27 and connecting rod leakage port 65 are designed for the purpose of saving consumables and weight reduction. Of course, in other embodiments, the relevant leakage ports may not be provided.

[0061] The locking mechanism 4 includes a locking base 41, a control elastic member 42, a locking elastic piece 43, and a locking flat plate 44. A hollow locking accommodation cavity is formed in the lower part of the locking base 41. An inclined surface boss 45 is obliquely protruded into the cavity on a side wall of the locking accommodation cavity. The inclined surface boss 45 is used to accommodate the locking flat plate 44. The bottom surface of the locking elastic piece 43 abuts against the upper surface of the locking flat plate 44. The bottom of the control elastic member 42 is embedded in the locking accommodation cavity, and the upper part of the control elastic member 42 extends upward along the periphery of the locking base 41.

[0062] Wherein, notches are provided at both ends of the locking elastic piece 43 and the locking flat plate 44 to be engaged with the accommodating parts in the locking accommodation cavity of the locking base 41. The accommodating parts include but are not limited to grooves, protruding blocks, etc.

[0063] Furthermore, a coupling channel is vertically and penetratingly formed in the locking base 41. The base support rod 32 of the base 3 is inserted into the coupling channel through the bottom plate hole 411 at the bottom of the locking base 41.

[0064] The shape of the base body 31 of the base 3 can be a hemispherical body, a spherical crown, a warhead shape, a symmetrically flattened tip, etc.

[0065] Furthermore, a locking hinge hole 412 is formed in the side surface of the locking base 41 adjacent to the side surface of the mounting upper clip assembly 1 for the hinge plate 24 of the lower clip assembly 2 to be movably connected to the corresponding side surface of the locking base 41.

[0066] The above-mentioned movable connection includes but is not limited to hinge connection, pivot connection, etc.

[0067] Wherein, an expandable blocking body is provided inside and / or on the surface of the blocking braid 5. The blocking body fills or covers the blocking braid 5 during the opening process of the blocking braid 5 to fill the gaps of the blocking braid to block or cut off the backflow.

[0068] The pores of the blocking body when the blocking braid 5 is opened are smaller than the outer diameter of the backflow fluid. The blocking braid 5 presents shapes including but not limited to an 8-shaped, oval / ellipsoidal ( Figure 1 and Figure 2 ), triangular or conical ( Figure 3 and Figure 12 ), ingot-shaped, pillow-shaped ( Figure 13 ), saddle-shaped, spherical ( Figure 11 ), trumpet-shaped ( Figure 4 ) or irregular shape.

[0069] Furthermore, the blocking braid 5 is connected to the lower clip assembly 2 and / or the base 3, and the connection methods include but are not limited to riveting, welding, and threaded connection.

[0070] Mesh material: The blocking mesh 5 is made of an alloy with shape memory function or a degradable polymer material. Among them, the alloy includes but is not limited to nickel-titanium alloy and magnesium alloy with shape memory function, and the polymer material includes but is not limited to degradable poly-L-lactic acid.

[0071] In one embodiment, the upper clamping assembly 1 includes two elastic upper clamping plates 11 which are relatively arranged on both sides of the locking mechanism 4, and correspondingly two lower clamping assemblies 2 are arranged. The blocking mesh 5 is arranged on both sides of the middle connection of the two elastic upper clamping plates 11 or the lower clamping assemblies 2.

[0072] Furthermore, a biocompatible coating film is coated on the outer surfaces of the upper clamping assembly 1, the lower clamping assembly 2, the base 3, and the locking mechanism 4.

[0073] In another embodiment, at least part of the upper clamping assembly 1, the lower clamping assembly 2, the base 3, the locking mechanism 4, the blocking mesh 5, and the connecting rod arm 6 are made of biocompatible materials such as polyester, silicone resin, stainless steel, cobalt alloy, nickel-titanium, cobalt-chromium alloy, or titanium alloy, preferably stainless steel or cobalt-chromium alloy.

[0074] In another embodiment, the upper clamping assembly 1, the lower clamping assembly 2, the base 3, the locking mechanism 4, and the connecting rod arm 6 are made of a metal material or a metal alloy, and the metal material or alloy is selected from common implant metals such as stainless steel, cobalt alloy, cobalt-chromium alloy, titanium alloy, or nickel-titanium alloy.

[0075] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A valve clip with a plugging function, characterized in that: The valve clip includes an upper clip assembly (1), a lower clip assembly (2), a base (3), a locking mechanism (4), a sealing mesh (5), and a link arm (6); The number of the upper clip assembly (1) and the lower clip assembly (2) is equal and their opening and closing are matched to form a clamping part; The base (3) includes a base body (31) and a base support rod (32), and the base support rod (32) is vertically arranged on the upper surface of the base body (31); The locking mechanism (4) is movably sleeved on the base support rod (32) and its bottom abuts against and supports the upper surface of the base body (31); The lower part of the upper clip assembly (1) is fixedly arranged on one side of the locking mechanism (4), and the lower clip assembly (2) is movably connected to the locking mechanism (4) and is located below the upper clip assembly (1); The lower clip assembly (2), the base (3), the locking mechanism (4), and the link arm (6) form a four-bar linkage mechanism, which facilitates the opening and closing operation of the valve clip; The sealing mesh (5) is arranged adjacent to the upper clip assembly (1) on the other side of the locking mechanism (4), that is, on both sides of the clamping part; when the upper clip assembly (1) clamps with the lower clip assembly (2), the sealing mesh (5) is in an open state to seal the gaps on both sides of the clamping part; The upper clip assembly (1) includes an elastic upper clip plate (11) with shape memory function, and the elastic upper clip plate (11) has a preset expansion angle α; An expandable sealing body is arranged inside and / or on the surface of the sealing mesh (5), and the sealing body fills or covers the sealing mesh (5) during the opening process of the sealing mesh (5) to fill the gaps of the sealing mesh holes for sealing or cutting off the backflow.

2. The valve clip according to claim 1, characterized in that: At least one threading hole (12) is opened on the plate body of the elastic upper clip plate (11), and a rough structure (14) is arranged on the surface of the elastic upper clip plate (11) facing the lower clip assembly (2), and the rough structure is a convex structure.

3. The valve clip according to claim 2, characterized in that: The upper clip assembly (1) further includes an upper clip connecting bottom plate (13), and one elastic upper clip plate (11) is arranged at each end of the upper clip connecting bottom plate (13). The upper clip connecting bottom plate (13) and the elastic upper clip plates (11) at both ends are integrally arranged in a concave structure, and an upper clip through hole (15) is opened in the middle of the upper clip connecting bottom plate (13). Upper clip guiding and limiting holes (16) are opened through the lower parts of the two elastic upper clip plates (11). The upper surface of the upper clip connecting bottom plate (13) is attached to the bottom surface of the locking mechanism (4), and the inner side surfaces of the lower parts of the two elastic upper clip plates (11) are attached to the outer side surfaces of the locking mechanism (4).

4. The valve clip according to claim 2 or 3, characterized in that: The range of the preset expansion angle α of the elastic upper clip plate (11) is: α = 30~135°; 5. The valve clip according to claim 4, characterized in that: The lower clip assembly (2) includes a lower clip bottom plate (21) and lower clip side plates (22) vertically arranged on both sides of the lower clip bottom plate (21), and a receiving cavity for cooperating with the upper clip assembly (1) is formed by the lower clip bottom plate (21) and the lower clip side plates (22); The lower part of the lower clamping side plate (22) is connected to the outward expansion plate (23) and the hinge plate (24), and is movably connected to the locking mechanism (4) through the outward-expanded hinge plate (24).

6. The valve clip according to claim 5, characterized in that: A hinge hole (25) is penetrated and opened on the hinge plate (24) for connecting the lower clamping assembly (2) and the locking mechanism (4); a linkage hole (26) is opened on the outward expansion plate (23); a bottom plate leakage port (27) is opened on the lower clamping bottom plate (21).

7. The valve clip according to claim 5, characterized in that: The upper edges of the inner sides of the lower clamping bottom plate (21) and the lower clamping side plate (22) are rounded or flanged with an outward arc extension.

8. The valve clip according to claim 4, characterized in that: The locking mechanism (4) includes a locking seat (41), a control elastic member (42), a locking elastic piece (43) and a locking flat plate (44). A hollow locking accommodation cavity is opened at the lower part of the locking seat (41). An inclined surface boss (45) is obliquely protruded into the cavity on a side wall of the locking accommodation cavity. The inclined surface boss (45) is used to accommodate the locking flat plate (44). The bottom surface of the locking elastic piece (43) abuts against the upper surface of the locking flat plate (44). The bottom of the control elastic member (42) is embedded in the locking accommodation cavity, and the upper part of the control elastic member (42) extends upward along the periphery of the locking seat (41).

9. The valve clip according to claim 1, characterized in that: The plugging woven net (5) is made of a nickel-titanium material with a memory function, and the pores of the plugging body when the plugging woven net (5) is opened are smaller than the outer diameter of the backflow fluid.

10. The valve clip according to claim 1, characterized in that: The upper clamping assembly (1) includes two elastic upper clamping plates (11) which are oppositely arranged on both sides of the locking mechanism (4). Correspondingly, two lower clamping assemblies (2) are provided. The plugging woven net (5) is arranged at the middle gap between the two elastic upper clamping plates (11) or the lower clamping assemblies (2), and the plugging woven net (5) presents shapes including an 8-shape, an ellipse, a triangle, a horn shape, a sphere or an irregular shape.

11. The valve clip according to claim 10, characterized in that: The plugging woven net (5) is connected to the lower clamping assembly (2) and / or the base (3), and the connection methods include riveting, welding and threaded connection; wherein, the plugging woven net (5) is an alloy with a shape memory function or a degradable polymer material.

12. The valve clip according to claim 11, characterized in that: The alloy includes a nickel-titanium alloy and a magnesium alloy with a shape memory function, and the polymer material includes degradable polylactic acid.

13. The valve clip according to claim 2, characterized in that: The rough structure (14) is a row of barbs obliquely cut from two side edges of the plate body of the elastic upper clamping plate (11).

14. The valve clip according to claim 6, characterized in that: The connecting rod arm (6) includes a connecting rod bottom plate (61) and a connecting rod side plate (62) vertically arranged perpendicular to the side edge of the connecting rod bottom plate (61). The lower part of the connecting rod side plate (62) is movably connected to the base body (31) of the base (3), and the upper part of the connecting rod side plate (62) is movably connected to the linkage hole (26) of the lower clamping assembly (2), thereby forming a four-bar linkage mechanism, and the accommodation groove formed by the connecting rod bottom plate (61) and the connecting rod side plate (62) is accommodated and matched with the lower outer contour of the lower clamping assembly (2).

15. The valve clip according to claim 1, characterized in that: A biocompatible coating film is coated on the outer surfaces of the upper clamping assembly (1), the lower clamping assembly (2), the base (3) and the locking mechanism (4).

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