A valve clamp

Abstract

The present invention discloses a valve clamp, comprising a fixing seat, a clamping assembly, a driving assembly, a locking member and an elastic member. The clamping assembly comprises two proximal arms and two distal arms, and the two proximal arms are respectively used to cooperate with the two distal arms to clamp the leaflets. The driving assembly comprises a driving rod and two connecting arms, and the driving rod is used to drive the two connecting arms to rotate so as to drive the two distal arms to move closer to each other and fold or move away from each other and unfold. The locking member can slide between a first position and a second position along the axial direction of the driving rod to clamp the driving rod and release the driving rod; the elastic member drives the locking member to move from the second position to the first position. The present invention can improve the locking reliability.

Description

Technical Field

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

[0002] Surgical repair of body tissue often involves clamping the tissue to improve closure. When the tissue being repaired is a valve, the valve can be clamped using a clamp to improve valve closure. Take the common mitral valve repair as an example. The mitral valve is a part of the heart that sits between the left atrium and the left ventricle. Blood is pumped from the left atrium into the left ventricle, and when the left ventricle contracts to pump blood to the body, the mitral valve closes to prevent blood from being pumped back into the left atrium. In some patients, whether due to a genetic malformation, disease, or injury, the mitral valve does not close properly, resulting in a condition called regurgitation, in which blood is pumped into the atria every time the heart muscle contracts.

[0003] Mitral regurgitation is one of the most common valvular diseases today. The main causes include mitral annular dilatation, chordae tendineae insufficiency, myxomatous mitral valve degeneration, leaflet prolapse, rheumatic valvular heart disease, and ischemic lesions. Open mitral valvuloplasty and prosthetic valve replacement are the most effective treatments for mitral regurgitation. However, because the surgery requires extracorporeal circulation, it is relatively traumatic and carries a high incidence of complications and mortality in elderly patients and those with multiple comorbidities. Therefore, in recent years, the exploration of mitral valve repair techniques has led to the main interventional treatment being valve clipping. Valve clipping involves delivering an implantable clip to the vicinity of the mitral valve through a specific pathway, clamping and securing the free edges of the anterior and posterior leaflets, ensuring good coaptation of the leaflets at end-systole and reducing regurgitation.

[0004] As the implantable part, the valve clamp itself must have a safe locking capability. Currently, the clamps in related technologies mostly have lever-type, thread-type and sleeve-type locking methods. These locking methods all have the risk of locking failure and poor locking reliability. Summary of the Invention

[0005] In view of the above-mentioned defects or deficiencies in the prior art, the present invention provides a valve clamp to improve locking reliability.

[0006] One aspect of the present invention provides a valve clamp, comprising: a fixing seat; a clamping assembly, comprising two proximal arms and two distal arms, the proximal arm being connected to the fixing seat, the distal arm being rotatably connected to the fixing seat, the two proximal arms being respectively used to cooperate with the two distal arms to clamp the leaflet between the proximal arm and the distal arms; a driving assembly, comprising a driving rod and two connecting arms, one end of the two connecting arms being rotatably connected to the two distal arms respectively, the other ends of the two connecting arms being rotatably connected to the driving rod, the driving rod being connected to the fixing seat and being able to rotate relative to the fixing seat along a certain direction. Its axial movement is used to drive the two connecting arms to rotate so as to drive the two distal arms to move closer to each other and fold or away from each other and unfold; a locking member is slidably connected to the fixing seat and is sleeved on the driving rod, and the locking member can slide along the axial direction of the driving rod between a first position and a second position. In the first position, the locking member clamps the driving rod to prevent the driving rod from moving, and in the second position, the locking member releases the driving rod to allow the driving rod to move; an elastic member connects the fixing seat and the locking member, and the elastic member drives the locking member to move from the second position to the first position.

[0007] In some embodiments, the locking member includes a first movable block and a second movable block, and the first movable block is movably connected to the second movable block; wherein, when the locking member moves from the first position to the second position, the first movable block and the second movable block move away from each other to release the driving rod, and when the locking member moves from the second position to the first position, the first movable block and the second movable block move close to each other to clamp the driving rod.

[0008] In some embodiments, the driving rod has a conical surface; in the first position, the first movable block and the second movable block both abut against the conical surface; wherein the distance between the axis of the conical surface and the busbar gradually decreases from the distal end to the proximal end.

[0009] In some embodiments, the first movable block includes a first clamping surface, the second movable block includes a second clamping surface opposite to the first clamping surface, and both the first clamping surface and the second clamping surface abut against the tapered surface.

[0010] In some embodiments, when the locking member moves from the first position to the second position, the conical surface drives the first movable block and the second movable block to move away from each other.

[0011] In some embodiments, the fixed seat is provided with a receiving groove and a sliding groove, the driving rod is slidably set in the sliding groove and passes through the receiving groove, and the locking member is set in the receiving groove; wherein, the receiving groove has two first inclined surfaces arranged opposite to each other, the first movable block also includes a second inclined surface, the second inclined surface and the first clamping surface are respectively located on opposite sides of the first movable block; the second movable block also includes a third inclined surface, the third inclined surface and the second clamping surface are respectively located on opposite sides of the second movable block, and the second inclined surface and the third inclined surface are respectively slidably connected with the two first inclined surfaces.

[0012] In some embodiments, the elastic member is disposed in the accommodating groove, and the driving rod passes through the elastic member; wherein, one end of the elastic member along the axial direction of the driving rod abuts against the fixing seat, and the other end abuts against the first movable block and the second movable block.

[0013] In some embodiments, the first movable block includes a first main body and a first protrusion, the first clamping surface and the second inclined surface are respectively formed on opposite sides of the first main body, and the first main body is also formed with a first groove; the second movable block includes a second main body and a second protrusion, the second clamping surface and the third inclined surface are formed on opposite sides of the second main body, and the second main body is formed with a second groove; wherein, the first protrusion extends into the second groove and is slidably connected to the second groove, and the second protrusion extends into the first groove and is slidably connected to the first groove.

[0014] In some embodiments, at least one of the tapered surface, the first clamping surface, the second clamping surface, the first inclined surface, the second inclined surface, and the third inclined surface is provided with a concave-convex structure.

[0015] In some embodiments, the valve clamp further includes: a pull ring connected to the locking member, for driving the locking member to move from the first position to the second position.

[0016] In some embodiments, the driving assembly further includes a fixing block, the distal end of the driving rod is fixed to the fixing block, and the other ends of the two connecting arms are rotatably connected to the fixing block.

[0017] The valve clamp provided by the present invention has at least the following beneficial effects:

[0018] The locking member moves between a first position and a second position. In the second position, the locking member releases the drive rod to move the drive rod to drive the clamping assembly to clamp the leaflet. In the first position, the locking member prevents the drive rod from moving so that the clamping assembly remains in a state of clamping and locking the leaflet. The structure of the valve clamp itself is utilized to achieve locking, which greatly reduces the risk of locking failure and improves locking reliability.

[0019] The distance between the axis of the cone and the busbar gradually increases from the distal end to the proximal end, making the cone in the shape of an inverted cone. The closer the cone is to the proximal end, the larger the outer diameter is. When the locking piece is in the first position to lock the drive rod, the drive rod faces greater resistance to movement toward the distal end when impacted by blood flow, that is, the two movable blocks can "lock" the drive rod and prevent the drive rod from moving toward the distal end, greatly reducing the possibility of the two distal arms opening. As a result, the two distal arms can firmly cooperate with the two proximal arms to clamp the leaflets, further improving the locking reliability.

[0020] Since the first protrusion extends into the second groove and is slidably connected to the second groove, and the second protrusion extends into the first groove and is slidably connected to the first groove, the two movable blocks can move up and down at the same time without separating, and cleverly utilize their own structure instead of adding additional components, thereby greatly reducing the risk of locking failure. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Other features, objects and advantages of the present invention will become more apparent upon reading the detailed description of non-limiting embodiments made with reference to the following drawings:

[0022] Figure 1 A schematic diagram of a valve clamp provided by one embodiment of the present invention in an implanted state;

[0023] Figure 2 A schematic structural diagram of a valve clamp provided by one embodiment of the present invention;

[0024] Figure 3 A schematic cross-sectional view of a valve clamp provided by one embodiment of the present invention, wherein hatching is omitted for clarity of illustration;

[0025] Figure 4 A schematic diagram of a portion of the structure of a valve clamp provided by one embodiment of the present invention, wherein hatching is omitted for clarity of illustration;

[0026] Figure 5 A schematic diagram of the structure of a valve clamp provided by one embodiment of the present invention, wherein the drive rod is omitted;

[0027] Figure 6 A schematic diagram of the structure of a valve clamp provided by one embodiment of the present invention;

[0028] Figure 7 A schematic diagram of the partial structural decomposition of a valve clamp provided in one embodiment of the present invention.

[0029] icon:

[0030] Valve clamp 100; interventional tool 200; leaflet 300; fixing seat 10; clamping assembly 20; driving assembly 30; locking member 40; elastic member 50; pull ring 60; accommodating groove 11; sliding groove 12; proximal arm 21; distal arm 22; driving rod 31; connecting arm 32; fixing block 33; conical surface 311; first movable block 41; second movable block 42; first clamping surface 411; second clamping surface 421; first inclined surface 111; second inclined surface 412; first protrusion 413; first groove 414; third inclined surface 422; second protrusion 423; second groove 424; axis L1; busbar L2. DETAILED DESCRIPTION

[0031] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0032] The terms used in the embodiments of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The singular forms "a", "the" and "the" used in the embodiments of the present invention are also intended to include plural forms, unless the context clearly indicates other meanings.

[0033] It should be understood that although the terms first, second, third, etc. may be used to describe the acquisition modules in the embodiments of the present invention, the acquisition modules should not be limited to these terms. These terms are only used to distinguish the acquisition modules from each other.

[0034] The word "if," as used herein, may be interpreted as "at the time of" or "when" or "in response to determining" or "in response to detecting," depending on the context. Similarly, the phrases "if it is determined" or "if (stated condition or event) is detected" may be interpreted as "when it is determined" or "in response to the determination" or "when detecting (stated condition or event)" or "in response to detecting (stated condition or event)," depending on the context.

[0035] It should be noted that the directional terms such as "upper," "lower," "left," and "right" described in the embodiments of the present invention are described from the perspectives shown in the accompanying drawings and should not be construed as limiting the embodiments of the present invention. Furthermore, in the context, it should be understood that when an element is referred to as being formed "on" or "under" another element, it can be formed not only directly "on" or "under" the other element, but also indirectly "on" or "under" the other element through an intermediate element.

[0036] Surgical repair of body tissue often involves clamping the tissue to improve closure. When the tissue being repaired is a valve, a clamp can be used to clamp the valve to improve closure. For example, in the common mitral valve repair procedure, the clamps currently used in related technologies mostly use lever-type or threaded locking methods, both of which carry the risk of locking failure and poor locking reliability.

[0037] 1. Lever locking method: the card and the center rod are locked by the friction between the card edges and the center rod. The card edges are easy to wear, and the friction coefficient decreases after wear, and the friction force decreases, which increases the risk of locking failure.

[0038] 2. The thread locking method causes multiple vibrations of the thread when the clamp arm moves, which can easily lead to locking failure.

[0039] In view of this, the present invention provides a valve clamp 100 that utilizes the structures of the clamps themselves to cooperate with each other for locking, thereby greatly reducing the risk of locking failure.

[0040] The valve clamp 100 of the present invention can be used for mitral valve repair, tricuspid valve repair, etc. In the following embodiments, the valve clamp 100 is used for mitral valve repair as an example for description.

[0041] Reference Figures 1 to 7 An embodiment of the present invention provides a valve clamp 100 for being implanted into the atrium through an interventional tool 200 (which may be an interventional catheter) to clamp a valve leaflet 300 .

[0042] In the present embodiment, "proximal" refers to the side closer to the operator, while "distal" refers to the side farther from the operator. With respect to the mitral valve, the proximal end refers to the atrial or upstream side of the leaflet 300, while the distal end refers to the ventricular or downstream side of the leaflet 300.

[0043] The valve clamp 100 includes a fixing seat 10 , a clamping assembly 20 , a driving assembly 30 , a locking member 40 and an elastic member 50 .

[0044] The clamping assembly 20 includes two proximal arms 21 and two distal arms 22. The proximal arm 21 is connected to the fixed seat 10, and the distal arm 22 is rotatably connected to the fixed seat 10. The two proximal arms 21 are respectively used to cooperate with the two distal arms 22 to clamp the leaflet 300 between the proximal arm 21 and the distal arm 22.

[0045] Each proximal arm 21 can be a flexible, elastic element, and the two proximal arms 21 have a tendency to deform away from each other toward the distal side, so that when released, the two proximal arms 21 unfold and cooperate with the distal arm 22 to clamp the leaflet 300. The two proximal arms 21 can be an integrally molded part. The proximal arms 21 can be cutting spring arms.

[0046] The driving assembly 30 includes a driving rod 31 and two connecting arms 32. One end of the two connecting arms 32 is rotatably connected to the two distal arms 22 respectively, and the other end of the two connecting arms 32 is rotatably connected to the driving rod 31. The driving rod 31 is connected to the fixed base 10 and can move axially relative to the fixed base 10, and is used to drive the two connecting arms 32 to rotate to drive the two distal arms 22 to move closer to each other and fold or move away from each other and unfold.

[0047] The connecting arm 32 may be directly rotatably connected to the driving rod 31 , or may be rotatably connected to the driving rod 31 via a fixing block 33 .

[0048] As an example, see Figure 2 The drive assembly 30 further includes a fixing block 33. The distal end of the drive rod 31 is fixed to the fixing block 33. The other ends of the two connecting arms 32 are rotatably connected to the fixing block 33. One end of the two connecting arms 32 can be rotatably connected to the two distal arms 22 via a pin, and the other end of the two connecting arms 32 can be rotatably connected to the fixing block 33 via a pin.

[0049] For example, the distal arm 22 may be a large arm, and the connecting arm 32 may be a small arm smaller in size than the distal arm 22 .

[0050] When the driving rod 31 moves toward the distal side along its axial direction relative to the fixing seat 10, the two connecting arms 32 rotate to drive the two distal arms 22 to rotate away from each other and unfold. The two unfolded distal arms 22 support the leaflets 300, that is, hold the leaflets 300. At the same time, the two proximal arms 21 are released, and through the action of their own elastic force, the two proximal arms 21 unfold away from each other and cooperate with the two distal arms 22 to clamp the leaflets 300.

[0051] The locking member 40 is slidably connected to the fixing seat 10 and is sleeved on the driving rod 31. The locking member 40 can slide along the axial direction of the driving rod 31 between a first position and a second position. In the first position, the locking member 40 clamps the driving rod 31 to prevent the driving rod 31 from moving. In the second position, the locking member 40 releases the driving rod 31 to allow the driving rod 31 to move.

[0052] The locking member 40 can clamp the drive rod 31 to prevent the drive rod 31 from moving by friction therebetween. The locking member 40 can release the drive rod 31 so that the friction therebetween is insufficient to prevent the drive rod 31 from moving relative to the locking member 40. The locking member 40 can also release the drive rod 31 so that a gap exists between the drive rod 31 and the lock member 40, allowing the drive rod 31 to move freely relative to the locking member 40. In other words, when the locking member 40 releases the drive rod 31, the two can be in contact or non-contact.

[0053] The elastic member 50 connects the fixing base 10 and the locking member 40 , and the elastic member 50 drives the locking member 40 to move from the second position to the first position.

[0054] The elastic member 50 connects the fixing base 10 and the locking member 40, and one end of the elastic member 50 abuts against the fixing base 10, and the other end abuts against the locking member 40. The elastic member 50 can be a spring, a spring, etc.

[0055] The locking member 40 can be moved from the first position to the second position by an external force, so that the locking member 40 releases the driving rod 31. For example, by pulling the ring 60 ( Figure 7 The pull ring 60 is connected to the locking member 40 (as shown), and drives the locking member 40 from the first position to the second position. The pull ring 60 can be mounted on the locking member 40. As an example, the first position can be closer to the distal end than the second position. Of course, if necessary, the first position can be designed to be closer to the proximal end than the second position.

[0056] The locking member 40 moves from the first position to the second position, and the locking member 40 releases the drive rod 31. The intervention tool 200 can be used to drive the drive rod 31 to move toward the distal side, so that the two distal arms 22 are unfolded. At the same time, the two proximal arms 21 are unfolded and respectively cooperate with the two distal arms 22 to clamp and fix the leaflets 300. Then, the intervention tool 200 drives the drive rod 31 to move toward the proximal side, so that the angle of the two distal arms 22 is reduced, that is, the two distal arms 22 are tightened so that the proximal arms 21 and the distal arms 22 clamp the leaflets 300. Then, the pull ring 60 is released, and the elastic member 50 is used to move the locking member 40 from the second position to the first position. The locking member 40 clamps the drive rod 31 to prevent the drive rod 31 from moving, so that the proximal arms 21 and the distal arms 22 firmly clamp the leaflets 300. Then, the intervention tool 200 is withdrawn to complete the implantation of the valve clamp 100.

[0057] The locking member 40 moves between a first position and a second position. In the second position, the locking member 40 releases the driving rod 31 so that the driving rod 31 moves to drive the clamping assembly 20 to clamp the leaflet 300. In the first position, the locking member 40 prevents the driving rod 31 from moving so that the clamping assembly 20 maintains the state of clamping and locking the leaflet 300. The structure of the valve clamp 100 itself is utilized to achieve locking, which greatly reduces the risk of locking failure and improves locking reliability.

[0058] In some embodiments, the locking member 40 includes a first movable block 41 and a second movable block 42, and the first movable block 41 is movably connected to the second movable block 42; wherein, when the locking member 40 moves from the first position to the second position, the first movable block 41 and the second movable block 42 move away from each other to release the drive rod 31, and when the locking member 40 moves from the second position to the first position, the first movable block 41 and the second movable block 42 move close to each other to clamp the drive rod 31.

[0059] The first movable block 41 and the second movable block 42 move closer to each other in the radial direction of the drive rod 31 to clamp the drive rod 31 and prevent the drive rod 31 from moving. The first movable block 41 and the second movable block 42 move farther away from each other in the radial direction of the drive rod 31 to release the drive rod 31 and allow the drive rod 31 to move, thereby expanding or contracting the two distal arms 22.

[0060] The locking member 40 clamps and releases the driving rod 31 by moving the two movable blocks closer to or farther away from each other, thereby improving the reliability of restricting the movement of the driving rod.

[0061] In some embodiments, the driving rod 31 has a tapered surface 311 ( Figure 6 In the first position, the first movable block 41 and the second movable block 42 are in contact with the tapered surface 311 to clamp the drive rod 31. The distance between the axis L1 of the tapered surface 311 and the generatrix L2 gradually increases from the distal end to the proximal end.

[0062] The distance between the axis L1 of the conical surface 311 and the busbar L2 gradually increases from the distal end to the proximal end, so that the conical surface 311 is an inverted cone. The closer the conical surface 311 is to the proximal end, the larger the outer diameter is. When the locking member 40 is in the first position to lock the drive rod 31, the resistance to the movement of the drive rod 31 toward the distal end when impacted by the blood flow is greater, that is, the two movable blocks can "lock" the drive rod 31 and prevent the drive rod 31 from moving toward the distal end, thereby greatly reducing the possibility of the two distal arms 22 opening. As a result, the two distal arms 22 can firmly cooperate with the two proximal arms 21 to clamp the leaflets, further improving the locking reliability.

[0063] In some embodiments, the first movable block 41 includes a first clamping surface 411, and the second movable block 42 includes a second clamping surface 421 opposite the first clamping surface 411. Both the first clamping surface 411 and the second clamping surface 421 abut against the tapered surface. When the locking member 40 moves from the first position to the second position, the tapered surface 311 drives the first movable block 41 and the second movable block 42 away from each other.

[0064] The locking member 40 moves from the first position to the second position, and the conical surface 311 drives the first movable block 41 and the second movable block 42 to move away from each other to release the driving rod 31. At this time, the first clamping surface 411 and the second clamping surface 421 can both contact the conical surface of the driving rod 31, but there is almost no clamping force.

[0065] By having the tapered surface 311 of the driving rod 31 , the structure of the driving rod 31 is utilized to drive the first movable block 41 and the second movable block 42 to move away from each other without adding too many parts, thereby further reducing the risk of locking failure.

[0066] In some embodiments, continue to refer to Figure 6The fixed seat 10 is provided with a receiving groove 11 and a sliding groove 12, the driving rod 31 is slidably set in the sliding groove 12 and passes through the receiving groove 11, and the locking member 40 is arranged in the receiving groove 11; wherein, the receiving groove 11 has two first inclined surfaces 111 arranged opposite to each other, the first movable block 41 also includes a second inclined surface 412, the second inclined surface 412 and the first clamping surface 411 are respectively located on the opposite sides of the first movable block 41; the second movable block 42 also includes a third inclined surface 422, the third inclined surface 422 and the second clamping surface 421 are respectively located on the opposite sides of the second movable block 42, the second inclined surface 412 and the third inclined surface 422 are respectively slidably connected with the two first inclined surfaces 111.

[0067] When the locking member 40 moves from the first position to the second position, the conical surface 311 drives the first movable block 41 and the second movable block 42 to slide along the first inclined surface 111 and move away from each other, thereby improving the stability of the two movable blocks during movement.

[0068] For example, the distance between the two first inclined surfaces 111 gradually increases from the distal end to the proximal end.

[0069] Thus, the risk of the locking member 40 being loosened in the first position can be reduced, so that the first movable block 41 and the second movable block 42 can clamp the driving rod 31 more reliably.

[0070] The angle between the first inclined surface 111 and the axis L1 of the conical surface 311 can be equal to the angle between the axis L1 of the conical surface 311 and the busbar L2, or greater than the angle between the axis L1 of the conical surface 311 and the busbar L2, or less than the angle between the axis L1 of the conical surface 311 and the busbar L2.

[0071] For example, the angle between the first inclined surface 111 and the axis L1 of the tapered surface 311 is smaller than the angle between the axis L1 of the tapered surface 311 and the generatrix L2. The pull ring 60 pulls the movable block (e.g., the first movable block 41) toward the proximal end. Once the movable block reaches the second position, the drive rod 31 can move toward the proximal end or distal end, thereby releasing and retracting the clamp. During this time, the pull ring 60 remains in a tensioned state (necessitating the elastic force of the elastic member 50 to overcome it). When the pull ring 60 is released, the movable block is elastically activated by the elastic member 50, springing upward, locking the drive rod 31 and, consequently, the clamp.

[0072] In some embodiments, the elastic member 50 is disposed in the accommodating groove 11, and the driving rod 31 passes through the elastic member 50; wherein, one end of the elastic member 50 along the axial direction of the driving rod 31 abuts against the fixed seat 10, and the other end abuts against the first movable block 41 and the second movable block 42.

[0073] The elastic member 50 is disposed in the accommodating groove 11 , which can save space and help the valve clamp to be more miniaturized.

[0074] In some embodiments, the first movable block 41 includes a first main body and a first protrusion 413, a first clamping surface 411 and a second inclined surface 412 are respectively formed on opposite sides of the first main body, and the first main body is further formed with a first groove 414; the second movable block 42 includes a second main body and a second protrusion 423, a second clamping surface 421 and a third inclined surface 422 are formed on opposite sides of the second main body, and the second main body is formed with a second groove 424 ( Figure 6 As shown); wherein, the first protrusion 413 extends into the second groove 424 and is slidably connected to the second groove, and the second protrusion 423 extends into the first groove 414 and is slidably connected to the first groove 414.

[0075] Since the first protrusion 413 extends into the second groove 424 and is slidably connected to the second groove, and the second protrusion 423 extends into the first groove 414 and is slidably connected to the first groove 414, the two movable blocks can move up and down at the same time without separating, and cleverly utilize their own structure instead of adding additional components, thereby greatly reducing the risk of locking failure.

[0076] In some embodiments, at least one of the tapered surface 311, the first clamping surface 411, the second clamping surface 421, the first inclined surface 111, the second inclined surface 412, and the third inclined surface 422 is provided with a concave-convex structure. The concave-convex structure may be formed in a sawtooth shape, a thread shape, or the like.

[0077] The concave-convex structure can increase friction to increase the locking force.

[0078] The above description is merely a preferred embodiment of the present invention. Those skilled in the art should understand that the scope of the present invention is not limited to technical solutions formed by specific combinations of the above-mentioned technical features. It also encompasses other technical solutions formed by any combination of the above-mentioned technical features or their equivalents, without departing from the above-mentioned disclosure. For example, a technical solution formed by replacing the above-mentioned features with (but not limited to) technical features with similar functions disclosed in this invention.

Claims

1. A valve clamp, characterized in that: include: Fixed seat; a clamping assembly comprising two proximal arms and two distal arms, wherein the proximal arms are connected to the fixing base, and the distal arms are rotatably connected to the fixing base, and the two proximal arms are respectively used to cooperate with the two distal arms to clamp the leaflet between the proximal arms and the distal arms; The drive assembly includes a drive rod and two connecting arms, one end of each of the connecting arms being rotatably connected to the two distal arms, and the other end of each of the connecting arms being rotatably connected to the drive rod. The drive rod is connected to the fixing seat and can move axially relative to the fixing seat, and is used to drive the two connecting arms to rotate so as to drive the two distal arms to move closer to each other for folding or farther away from each other for unfolding. The fixing seat is provided with a receiving groove and a sliding groove, and the drive rod is slidably provided in the sliding groove and passes through the receiving groove. a locking member disposed in the receiving groove, the locking member being slidably connected to the fixing seat and sleeved on the driving rod, the locking member being capable of sliding along the axial direction of the driving rod between a first position and a second position, wherein in the first position, the locking member clamps the driving rod to prevent the driving rod from moving, and in the second position, the locking member releases the driving rod to allow the driving rod to move; an elastic member connecting the fixing seat and the locking member, wherein the elastic member drives the locking member to move from the second position to the first position; The locking member includes a first movable block and a second movable block, wherein the first movable block is movably connected to the second movable block; When the locking member moves from the first position to the second position, the first movable block and the second movable block move away from each other to release the driving rod; when the locking member moves from the second position to the first position, the first movable block and the second movable block move toward each other to clamp the driving rod; The driving rod has a tapered surface; In the first position, the first movable block and the second movable block abut against the conical surface; The distance between the axis of the cone surface and the generatrix gradually increases from the distal end to the proximal end.

2. The valve clamp according to claim 1, characterized in that: The first movable block includes a first clamping surface, and the second movable block includes a second clamping surface opposite to the first clamping surface, and the first clamping surface and the second clamping surface both abut against the tapered surface; When the locking member moves from the first position to the second position, the conical surface drives the first movable block and the second movable block to move away from each other.

3. The valve clamp according to claim 2, characterized in that: The receiving groove has two first inclined surfaces arranged opposite to each other, and the first movable block further includes a second inclined surface, and the second inclined surface and the first clamping surface are respectively located on opposite sides of the first movable block; The second movable block further includes a third inclined surface. The third inclined surface and the second clamping surface are respectively located on two opposite sides of the second movable block. The second inclined surface and the third inclined surface are respectively slidably connected to the two first inclined surfaces.

4. The valve clamp according to claim 3, characterized in that: The elastic member is disposed in the receiving groove, and the driving rod passes through the elastic member; Wherein, one end of the elastic member along the axial direction of the driving rod abuts against the fixing seat, and the other end abuts against the first movable block and the second movable block.

5. The valve clamp according to claim 3, characterized in that: The first movable block includes a first main body and a first protruding portion, the first clamping surface and the second inclined surface are respectively formed on opposite sides of the first main body, and the first main body is further formed with a first groove; The second movable block includes a second main body and a second protruding portion, the second clamping surface and the third inclined surface are formed on opposite sides of the second main body, and the second main body is formed with a second groove; The first protrusion extends into the second groove and is slidably connected to the second groove, and the second protrusion extends into the first groove and is slidably connected to the first groove.

6. The valve clamp according to claim 3, characterized in that: At least one of the tapered surface, the first clamping surface, the second clamping surface, the first inclined surface, the second inclined surface, and the third inclined surface is provided with a concave-convex structure.

7. The valve clamp according to claim 1, characterized in that: The valve clamp further comprises: A pull ring is connected to the locking member and is used to drive the locking member to move from the first position to the second position.

8. The valve clamp according to claim 1, characterized in that: The driving assembly further comprises a fixing block, the distal end of the driving rod is fixed to the fixing block, and the other ends of the two connecting arms are rotatably connected to the fixing block.

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