Leaflet extension device

Abstract

The application provides a valve leaflet extension device, which comprises a delivery catheter, a first clamping arm, a second clamping arm, an opening and closing rod and a locking assembly, the first clamping arm is fixedly arranged at the distal end of the delivery catheter, the second clamping arm is rotationally connected to the proximal end of the first clamping arm, the opening and closing rod is connected to the proximal end of the second clamping arm and is used for opening or closing the second clamping arm, and the locking assembly comprises a blocking piece and a push rod connected with the blocking piece, and the push rod is used for driving the blocking piece to move to block the opening of the second clamping arm. The valve leaflet extension device of the application is provided with the opening and closing rod and the locking assembly, the push rod drives the blocking piece to move to block the opening of the second clamping arm, and the technical problem that the second clamping arm is pried up and tilted during the puncture process and causes the failure of the operation is solved.

Description

Technical Field

[0001] This invention belongs to the field of medical device technology, specifically relating to a leaflet elongation device. Background Technology

[0002] This section provides only background information relevant to this disclosure and is not necessarily prior art.

[0003] Mitral regurgitation is one of the most common valvular heart diseases today. The main causes include rheumatic heart disease, mitral myxoid degeneration, ischemic heart disease, and cardiomyopathy, leading to lesions in the mitral valve structure, including the annulus, leaflets, chordae tendineae, and papillary muscles, resulting in the inability of the mitral valve leaflets to close completely. Surgical treatment is one of the effective methods for treating mitral regurgitation; however, due to the significant trauma involved, it is not suitable for elderly patients or those with multiple comorbidities. Currently, minimally invasive interventional surgery is the preferred treatment for most heart diseases. In some cases, for mitral regurgitation, an artificial leaflet can be fixed to the native leaflet to increase the overall length of the mitral valve leaflet, thus addressing the problem of insufficient leaflet occlusion height and incomplete closure. However, during the process of adding an artificial leaflet to the native leaflet, there is a risk that the clamping arm may be stretched open and tilted during the puncture, leading to surgical failure. Summary of the Invention

[0004] This invention provides a valve leaflet lengthening device, aiming to at least solve the technical problem of surgical failure caused by the clamp arm being stretched and tilted during puncture. This objective is achieved through the following technical solution:

[0005] The leaflet elongation device provided by the present invention includes:

[0006] Delivery conduit;

[0007] The first clamping arm is fixed to the distal end of the delivery conduit;

[0008] The second clamping arm is rotatably connected to the proximal end of the first clamping arm;

[0009] An opening / closing lever is connected to the proximal end of the second clamping arm and is used to open or close the second clamping arm;

[0010] The locking assembly includes a blocking member and a push rod connected to the blocking member, the push rod being used to drive the blocking member to prevent the second clamping arm from opening.

[0011] The leaflet lengthening device of the present invention, by setting up a delivery catheter, a first clamping arm, a second clamping arm, an opening and closing rod and a locking component, enables the second clamping arm to be locked by the locking component before puncturing the original leaflet after the first and second clamping arms have successfully captured it. This solves the technical problem that the second clamping arm will not be stretched open and tilted up by external force during the puncture process, which would lead to surgical failure.

[0012] In addition, the leaflet elongation device according to an embodiment of the present invention may also have the following additional technical features:

[0013] In some embodiments of the present invention, the second clamping arm includes a pushing portion connected to the opening and closing rod, and a rotating portion extending from one side of the pushing portion toward the proximal end, the blocking member being used to prevent the rotating portion from rotating to prevent the second clamping arm from opening.

[0014] In some embodiments of the present invention, the distal end of the blocking member is tapered and has an inclined surface.

[0015] In some embodiments of the present invention, a first fixing member and a second fixing member having a certain distance from the first fixing member are fixedly provided at the proximal end of the opening and closing rod. A first sliding block is sleeved on the opening and closing rod. The first sliding block is disposed between the first fixing member and the second fixing member and can move axially on the opening and closing rod. A first elastic member is also sleeved on the opening and closing rod. The first elastic member is disposed between the first fixing member and the first sliding block.

[0016] In some embodiments of the present invention, a third fixing member and a fourth fixing member having a certain distance from the third fixing member are fixedly provided at the proximal end of the push rod, a second sliding block is sleeved on the push rod, the second sliding block is disposed between the third fixing member and the fourth fixing member and can move axially on the push rod, and a second elastic member is also sleeved on the push rod, the second elastic member being disposed between the fourth fixing member and the second sliding block.

[0017] In some embodiments of the present invention, the blocking member includes a locking block and a push block for pushing the locking block to move. The push rod is disposed at the proximal end of the push block. A boss is provided on the push block. A groove is provided on the locking block for the boss to move. The boss moves in the groove, thereby driving the locking block to move. The second clamping arm includes a pushing part connected to the opening and closing rod, and a rotating part extending from one side of the pushing part to the proximal end. The locking block is used to prevent the pushing part from rotating to prevent the second clamping arm from opening.

[0018] In some embodiments of the present invention, the push block includes a first sub-push block and a second sub-push block integrally formed with the first sub-push block, the boss protruding from the second sub-push block, and the locking block includes a first sub-locking block and a second sub-locking block integrally formed with the first sub-locking block, the sum of the thicknesses of the second sub-locking block and the second sub-push block being equal to the thickness of the first sub-push block.

[0019] In some embodiments of the present invention, the first sub-lock block has a first inclined surface facing the pushing part, the first sub-lock block also has a second inclined surface connected to the first inclined surface, the pushing part has a third inclined surface opposite to the first inclined surface, the first inclined surface and the third inclined surface are parallel, and the second inclined surface and the third inclined surface form a certain angle.

[0020] In some embodiments of the present invention, the leaflet extension device further includes a plate fastener, which can control the opening and closing rod and the push rod to move in opposite directions.

[0021] In some embodiments of the present invention, the leaflet elongation device includes a first control member and a second control member, wherein the first control member controls the opening and closing rod to move proximally or distally, and the second control member controls the push rod to move proximally or distally. Attached Figure Description

[0022] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings.

[0023] In the attached diagram:

[0024] Figure 1 This diagram illustrates the overall structure of the leaflet extension device of the present invention.

[0025] Figure 2 This diagram illustrates the exploded structure of the leaflet elongation device of the present invention.

[0026] Figure 3 This diagram illustrates the structure of the components controlling the opening and closing of the second clamping arm in the leaflet extension device of the present invention.

[0027] Figure 4 This diagram illustrates the structure of the relevant components controlling the movement of the blocking member in the leaflet extension device of the present invention.

[0028] Figure 5 This diagram illustrates the structure of the implanted anchor, artificial leaflet, artificial tendineae, and fasteners in the leaflet extension device of the present invention.

[0029] Figure 6 This diagram illustrates the structure of the valve leaflet extension device of the present invention before puncture, and before the fastening member moves toward the implantation anchor.

[0030] Figure 7 This diagram illustrates the structure of the leaflet extension device of the present invention after the fastening element moves toward the implantation anchor, i.e., after puncture.

[0031] Figure 8 This diagram illustrates the structure after the artificial leaflet is connected to the native leaflet.

[0032] Figure 9 This diagram illustrates the structure of the second clamping arm in the leaflet extension device of the present invention, which is locked and cannot be opened after being fully closed.

[0033] Figure 10 This diagram illustrates the structure of the leaflet extension device of the present invention, where the second clamping arm is fully opened after being unlocked.

[0034] Figure 11 This diagram illustrates the structure of the leaflet extension device of the present invention, where the second clamping arm is locked after being fully closed when the first clamping arm and the second clamping arm clamp the original leaflet.

[0035] Figure 12 This diagram illustrates the structure of the leaflet extension device of the present invention, where the second clamping arm is locked after being closed when the first and second clamping arms clamp a thicker original leaflet.

[0036] Figure 13 This diagram illustrates the structure of the second clamping arm being locked after being closed in another embodiment of the leaflet extension device of the present invention;

[0037] Figure 14 This diagram illustrates the structure of the locking block in the leaflet extension device of the present invention.

[0038] Figure 15 This is a schematic diagram illustrating the structure of the pusher block in the leaflet extension device of the present invention from one perspective.

[0039] Figure 16 This is a schematic diagram illustrating the structure of the pusher block in the leaflet extension device of the present invention from another perspective;

[0040] Figure 17 This is a schematic diagram of the structure of the leaflet extension device of the present invention, showing the locking block extending from the first clamping arm to prevent the second clamping arm from rotating from one perspective.

[0041] Figure 18 for Figure 17 Enlarged structural diagram at point A;

[0042] Figure 19This is a schematic diagram of the structure of the leaflet extension device of the present invention, showing the locking block extending from the first clamping arm to prevent the second clamping arm from rotating.

[0043] Figure 20 This is a schematic diagram illustrating one perspective of the structure of the leaflet extension device of the present invention, in which the locking block retracts into the first clamping arm to unlock the second clamping arm so that the second clamping arm can rotate.

[0044] Figure 21 This is a schematic diagram illustrating another perspective of the structure of the leaflet extension device of the present invention, showing the locking block retracting into the first clamping arm to unlock the second clamping arm so that the second clamping arm can rotate.

[0045] Figure 22 for Figure 21 A magnified structural diagram at point B in the middle.

[0046] The markings in the attached diagram are as follows:

[0047] 1. Leaflet extension device; 10. First clamping arm; 11. First receiving groove; 20. Second clamping arm; 21. Through hole; 22. Pushing part; 221. Third inclined surface; 23. Rotating part; 24. Second receiving groove; 30. Opening and closing rod; 40. Blocking member; 41. Inclined surface; 42. Locking block; 421. Groove; 422. First sub-locking block; 4221. First inclined surface; 4222. Second inclined surface; 423. Second sub-locking block; 43. Push block; 431. Boss; 432. 1. Push block; 433. Second push block; 50. Push rod; 60. First fixing member; 61. Second fixing member; 62. First sliding block; 63. First elastic member; 64. Third fixing member; 65. Fourth fixing member; 66. Second sliding block; 67. Second elastic member; 70. Plate fastener; 71. Release rod; 72. Fastening member; 73. Implant anchor; 74. Drive rod; 75. Drive unit; 80. Delivery catheter; 2. Artificial leaflet; 3. Artificial chordae tendineae; 4. Native leaflet. Detailed Implementation

[0048] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

[0049] It should be understood that the terminology used herein is for the purpose of describing particular exemplary embodiments only and is not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms “a,” “an,” and “described” as used herein may also mean including the plural forms. The terms “comprising,” “including,” “containing,” and “having” are inclusive and therefore indicate the presence of the stated features, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof.

[0050] Although terms such as first, second, third, etc., may be used in this document to describe multiple elements, components, regions, layers, and / or segments, these elements, components, regions, layers, and / or segments should not be limited by these terms. These terms may be used only to distinguish one element, component, region, layer, or segment from another. Unless the context clearly indicates otherwise, terms such as "first," "second," and other numerical terms used herein do not imply order or sequence. Therefore, the first element, component, region, layer, or segment discussed below may be referred to as the second element, component, region, layer, or segment without departing from the teachings of the exemplary embodiments.

[0051] For ease of description, spatial relative terms may be used in the text to describe the relationship of one element or feature relative to another element or feature, as shown in the figure. These relative terms include, for example, "inside," "outside," "middle," "outer," "below," "below," "above," "over," etc. Such spatial relative terms are intended to include different orientations of the device in use or operation, other than those depicted in the figure. For example, if the device in the figure is flipped, an element described as "below other elements or features" or "below other elements or features" would subsequently be oriented as "above other elements or features" or "above other elements or features." Therefore, the example term "below" can include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions), and the spatial relative descriptors used in the text will be interpreted accordingly.

[0052] It should be noted that the terms "distal" and "proximal" are used as directional terms, which are commonly used in the field of interventional medical devices. "Distal" refers to the end furthest from the operator during the procedure, while "proximal" refers to the end closest to the operator. The direction of the rotational axis of objects such as cylinders and tubes is defined as the axial direction, and the radial direction refers to the direction perpendicular to the axial direction (along the cross-sectional radius).

[0053] Please see Figures 1 to 8The leaflet elongation device 1 of the present invention includes a delivery guide 80, a first clamping arm 10, a second clamping arm 20, an opening and closing rod 30, and a locking assembly. The first clamping arm 10 is fixed to the distal end of the delivery guide 80, the second clamping arm 20 is rotatably connected to the proximal end of the first clamping arm 10, and the opening and closing rod 30 is connected to the proximal end of the second clamping arm 20 and is used to open or close the second clamping arm 20. The locking assembly includes a blocking member 40 and a push rod 50 connected to the blocking member 40. The push rod 50 is used to drive the blocking member 40 to move to prevent the second clamping arm 20 from opening.

[0054] The first clamping arm 10 has a first receiving groove 11 for receiving the fastening member 72; the second clamping arm 20 has a second receiving groove 24 for receiving the implantation anchor 73, on which an artificial leaflet 2 is pre-connected; the leaflet extension device 1 also includes a release rod 71, which passes through the delivery conduit 80 and can move within the delivery conduit 80. The distal end of the release rod 71 is used to insert into the implantation anchor 73 to secure the implantation anchor 73. The leaflet lengthening device 1 is fixed within the second receiving groove 24 of the second clamping arm 20. It also includes a drive rod 74 and a drive part 75 located at the distal end of the drive rod 74. The drive rod 74 and drive part 75 can move within the delivery catheter 80 and the first clamping arm 10. The drive part 75 has a limiting groove for limiting the fastening member 72. The drive part 75 is used to move the fastening member 72 towards the implantation anchor 73 under the drive of the drive rod 74, thereby fixing the fastening member 72 to the implantation anchor 73. The process of lengthening the native leaflet 4 using the leaflet lengthening device 1 is roughly as follows: 1. The leaflet lengthening device 1 enters the heart and, when it reaches the vicinity of the target position, opens the second clamping arm 20. The first clamping arm 10 and the second clamping arm 20 capture the native leaflet 4. After capture, the second clamping arm 20 closes; 2. ... Figure 6 The image shows the state after the first clamping arm 10 and the second clamping arm 20 capture the native leaflet 4 and then the second clamping arm 20 is closed. At this point, the release rod 71 has fixed the implantation anchor 73 within the second receiving groove 24. Then, the drive rod 74 is driven to move proximally. The drive rod 74 is fixedly connected to the drive unit 75, causing the drive unit 75 to move proximally as well. Figure 7In this state, the fastening member 72 is inserted into the implantation anchor 73, so that the fastening member 72 and the implantation anchor 73 fix the original leaflet 4 and the artificial leaflet 2 together; 3. After the fastening member 72 and the implantation anchor 73 are fixed together, the release rod 71 is driven to move proximally, so that the release rod 71 is withdrawn from the implantation anchor 73. The implantation anchor 73 is no longer restricted by the release rod 71 and is confined in the second receiving groove 24. Then the second clamping arm 20 is opened. At this time, the implantation anchor 73 is dislodged from the second receiving groove 24, and the fastening member 72 can also be dislodged from the first receiving groove 11, so that the implantation anchor 73 and the fastening member 72 remain on the original leaflet 4 and the artificial leaflet 2. Then the second clamping arm 20 and the first clamping arm 10 are slowly withdrawn from the body. In this way, the artificial leaflet 2 can be connected to the original leaflet 4. Figure 8 As shown, the length of the original leaflet 4 has been increased, which can be used to avoid insufficient leaflet closure height caused by insufficient leaflet length.

[0055] During the movement of the fastening member 72 in the leaflet lengthening device 1 toward the implantation anchor 73, there is a problem that the second clamping arm 20 may be pried open and tilted during the process of the fastening member 72 puncturing the original leaflet 4 and the artificial leaflet 2 into the implantation anchor 73, resulting in the inability to accurately insert the fastening member 72 into the implantation anchor 73 and thus causing surgical failure. To address this problem, the leaflet lengthening device 1 is equipped with a locking component, which includes a blocking member 40 and a push rod 50 connected to the blocking member 40. The push rod 50 is used to drive the blocking member 40 to move in order to prevent the second clamping arm 20 from opening. Specifically, after the first clamping arm 10 and the second clamping arm 20 successfully capture the original leaflet 4, before the fastening member 72 moves toward the implantation anchor 73, the push rod 50 drives the blocking member 40 to move to the position that prevents the second clamping arm 20 from opening, thus ensuring that the second clamping arm 20 will not be tilted up during the puncture process and improving the success rate of the surgery.

[0056] Artificial chordae tendineae 3 can be pre-connected to the artificial leaflet 2. This allows the artificial leaflet 2 to achieve better opening and closing during the contraction and expansion phases after the original chordae tendineae in the human body have ruptured and lost their function. There are no restrictions on how the artificial chordae tendineae 3 is attached to the artificial leaflet 2. It can be knotted on the artificial leaflet 2 or other connection methods, as long as the artificial chordae tendineae 3 can be pre-connected to the artificial leaflet 2.

[0057] Specifically, the delivery catheter 80 has a distal end and a proximal end. A protective head may be formed at the distal end of the delivery catheter 80. To prevent tissue damage during insertion into the body, the distal surface of the protective head is preferably a smooth, rounded surface. A first clamping arm 10 is fixed to the distal end of the delivery catheter 80. This can mean that the first clamping arm 10 is fixedly connected to the distal end of the delivery catheter 80, or that the first clamping arm 10 is formed at the distal end of the delivery catheter 80. In this application, the artificial leaflet 2 can be understood as an artificial valve, and the native leaflet 4 can also be understood as a native valve. The native leaflet 4 can refer to the mitral valve, tricuspid valve, pulmonary valve, aortic valve, etc.

[0058] Please refer to one or more embodiments of this application. Figure 3 , Figures 9 to 12 The second clamping arm 20 includes a pushing part 22 connected to the opening / closing lever 30, and a rotating part 23 extending proximally from one side of the pushing part 22. A blocking member 40 is used to prevent the rotating part 23 from rotating, thus preventing the second clamping arm 20 from opening. A through hole 21 is provided at the junction of the pushing part 22 and the rotating part 23. A rotating shaft can be provided within the through hole 21, and the second clamping arm 20 can rotate around this rotating shaft to open or close the second clamping arm 20. Please refer to... Figure 4 The blocking member 40 is roughly rectangular, and the figure shows only one example. The blocking member 40 can also be a cylinder, prism, etc. There are no restrictions on it, as long as the blocking member 0 can prevent the rotating part 23 from rotating when it moves to a certain position, thereby preventing the second clamping arm 20 from opening.

[0059] Furthermore, in one embodiment, the distal end of the blocking member 40 is tapered and has an inclined surface 41. When the thickness of the original leaflet 4 held by the first clamping arm 10 and the second clamping arm 20 is relatively thin, such as Figure 11As shown, the second clamping arm 20 can be closed relatively horizontally. At this time, the inclined surface 41 of the blocking member 40 is not in contact with the rotating part 23, and the blocking member 40 moves a relatively long distance to the far end. However, the thickness of each native leaflet is different, and some native leaflets are thicker. In order to adapt to native leaflets of different thicknesses and effectively capture them without causing compression or damage, when the native leaflet 4 held by the second clamping arm 20 is thicker, the second clamping arm 20 can be closed at a certain angle to the horizontal. This avoids the second clamping arm 20 maintaining a horizontal clamping effect when holding a thicker native leaflet 4, which could easily damage the native leaflet 4. By providing an inclined surface 41 at the distal end of the blocking member 40, when the blocking member 40 blocks the rotating part 23, the inclined surface 41 of the blocking member 40 blocks the rotating part 23, that is, the rotating part 23 abuts against the inclined surface 41, thereby ensuring that the second clamping arm 20 can maintain a certain angle, while ensuring stable clamping of the original leaflet 4, and ensuring that the second clamping arm 20 will not be further lifted during the puncture process, thus improving the success rate of the operation.

[0060] Please refer to one or more embodiments of this application. Figure 3 The opening / closing rod 30 has a first fixing member 60 and a second fixing member 61 fixed at a certain distance from the first fixing member 60. A first sliding block 62 is sleeved on the opening / closing rod 30, located between the first fixing member 60 and the second fixing member 61, and can move axially on the opening / closing rod 30. A first elastic member 63 is also sleeved on the opening / closing rod 30, located between the first fixing member 60 and the first sliding block 62. The first elastic member 63 can be a compressible silicone part or a compression spring, etc. There are no strict restrictions on the specific structure of the first elastic member 63, as long as it can be compressed and can return to its original shape after compression. Figure 3As shown, the leaflet extension device 1 also includes a plate fastener 70, which is connected to the first sliding block 62. The figure shows that the plate fastener 70 is indirectly connected to the first sliding block 62 through other connecting parts. The plate fastener 70 can control the movement of the first sliding block 62, thereby driving the opening and closing rod 30 to move towards the proximal or distal end. Before the second clamping arm 20 is opened, the blocking member 40 moves proximally into the delivery conduit 80 under the action of the push rod 50 without obstructing the opening of the second clamping arm 20. Then, the plate fastener 70 rotates, causing the first sliding block 62 to move distally. The first sliding block 62 is mounted on the opening and closing rod 30, which in turn moves the opening and closing rod 30 distally, thus opening the second clamping arm 20. This is then used to clamp the original leaflets 4 of different thicknesses. When the second clamping arm 20 is closed, the plate fastener 70 rotates, causing the first sliding block 62 to move proximally, which in turn moves the opening and closing rod 30 proximally, thus closing the second clamping arm 20. When the thickest original leaflet 4 is clamped, the second clamping arm 20 can clamp at a certain angle to the horizontal direction (e.g., ...). Figure 12 As shown, because of the first elastic element 63, the first sliding block 62 can compress the first elastic element 63 so that the first sliding block 62 can move between the first fixing element 60 and the second fixing element 61, without driving the opening and closing rod 30 to continue to move towards the proximal end. By providing the first elastic element 63, it is avoided that when the second clamping arm 20 clamps the thick original leaflet 4, it will still close the second clamping arm 20 to the horizontal state and press the original leaflet 4 too hard, thus avoiding damage to the original leaflet 4.

[0061] In one or more embodiments, please refer to Figure 4 ,as well as Figures 9 to 12 The push rod 50 has a third fixing member 64 fixed at its proximal end and a fourth fixing member 65 at a certain distance from the third fixing member 64. A second sliding block 66 is sleeved on the push rod 50, located between the third fixing member 64 and the fourth fixing member 65 and axially movable on the push rod 50. A second elastic member 67 is also sleeved on the push rod 50, located between the fourth fixing member 65 and the second sliding block 66. The second elastic member 67 can be a compressible silicone part or a compression spring, etc. There are no strict restrictions on the specific structure of the second elastic member 67, as long as it can be compressed and can return to its original shape after compression. The leaflet extension device 1 may include a control member, which controls the movement of the second sliding block 66, thereby driving the push rod 50 to move towards the distal or proximal end. When the second clamping arm 20 clamps the original leaflet 4 of normal thickness, the second sliding block 66 moves towards the distal end, driving the push rod 50 and the blocking member 40 to move to the farthest position, such as... Figure 11At the position shown, the second clamping arm 20 is holding the original leaflet 4 of normal thickness. The rotating part 23 exerts no pressure on the blocking part 40, allowing the blocking member 40 to be positioned at the farthest point to prevent the second clamping arm 20 from tilting up during puncture. When the second clamping arm 20 clamps the thicker original leaflet 4, the second sliding block 66 moves distally, driving the push rod 50 and the blocking member 40 to move distally. At this time, because the original leaflet 4 held by the second clamping arm 20 is thicker, the second clamping arm 20 has a certain angle with the horizontal direction, and the second clamping arm 20 will slightly open, such as... Figure 12 As shown, at this time, the rotating part 23 of the second clamping arm 20 exerts a certain compressive force on the blocking member 40. After this compressive force is greater than the pre-installed force of the second elastic member 67, the second elastic member 67 is compressed, causing the blocking member 40 to move a certain distance proximally, so that the rotating part 23 abuts against the inclined surface 41 of the blocking member 40. In this way, when the second clamping arm 20 clamps the thicker original leaflet 4, due to the setting of the second elastic member 67, the blocking member 40 is adaptively retracted a certain distance proximally, avoiding the blocking member 40 forcibly blocking the second clamping arm 20 to a horizontal position, and also avoiding the second clamping arm 20 forcibly pressing the original leaflet 4, thus avoiding the original leaflet 4 being squeezed and damaged. At the same time, the blocking member 40 also maintains the blocking effect on the second clamping arm 20, preventing the second clamping arm 20 from opening and tilting up during the puncture process.

[0062] In another embodiment, please refer to Figures 13 to 22 The blocking member 40 includes a locking block 42 and a push block 43 for moving the locking block 42. A push rod 50 is located at the proximal end of the push block 43. A boss 431 protrudes from the push block 43. A groove 421 for the boss 431 to move is formed on the locking block 42. The boss 431 moves within the groove 421, thereby moving the locking block 42. The second clamping arm 20 includes a pushing part 22 connected to the opening / closing rod 30, and a rotating part 23 extending from one side of the pushing part 22 towards the proximal end. The locking block 42 is used to prevent the pushing part 22 from rotating, thereby preventing the second clamping arm 20 from opening. Figure 13 and Figure 19The diagram shows the state where the second clamping arm 20 is blocked from rotating. After the locking block 42 extends from the first clamping arm 10, it prevents the pushing part 22 from rotating, thus preventing the second clamping arm 20 from rotating. This ensures that after the first clamping arm 10 and the second clamping arm 20 successfully capture the original leaflet 4, before the fastening member 72 moves towards the implantation anchor 73, the locking block 42 prevents the second clamping arm 20 from rotating. This ensures that the second clamping arm 20 will not be pried open and tilted during the puncture process, improving the success rate of the surgery. The locking block 42 extends from the first clamping arm 10 by the protrusion 431 on the push block 43 moving within the groove 421 of the locking block 42, thereby causing the locking block 42 to extend from and retract from the first clamping arm 10. This achieves the effect that when the locking block 42 extends from the first clamping arm 10, it can prevent the second clamping arm 20 from rotating, and when it retracts into the first clamping arm 10, it can allow the second clamping arm 20 to rotate and open smoothly. The movement of push block 43 can be driven by the movement of push rod 50. Push rod 50 and push block 43 can be integrally formed or fixedly connected to each other.

[0063] Furthermore, the push block 43 includes a first sub-push block 432 and a second sub-push block 433 integrally formed with the first sub-push block 432, and a boss 431 protrudes from the second sub-push block 433. The locking block 42 includes a first sub-locking block 422 and a second sub-locking block 423 integrally formed with the first sub-locking block 422. The sum of the thicknesses of the second sub-locking block 423 and the second sub-push block 433 is equal to the thickness of the first sub-push block 432. To better coordinate the locking block 42 and the push block 43, a first sub-push block 432, a second sub-push block 433, a first sub-locking block 422, and a second sub-locking block 423 are provided. The first sub-locking block 422 mainly serves to prevent the second clamping arm 20 from rotating. The groove 421 of the locking block 42 is formed on the second sub-locking block 423. The protrusion 431 on the second sub-push block 433 moves within the groove 421 on the second sub-locking block 423, thereby driving the entire locking block 42 to move, so as to achieve the effect of blocking the second clamping arm 20, i.e., locking the second clamping arm 20, or unlocking the second clamping arm 20 so that it can be opened smoothly. The sum of the thicknesses of the second sub-locking block 423 and the second sub-push block 433 is equal to the thickness of the first sub-push block 432. This ensures that after the boss 431 is placed in the groove 421, i.e. after the second sub-push block 433 and the second sub-locking block 423 are stacked, the thicknesses of the second sub-push block 433 and the second sub-locking block 423 are the same as the thickness of the first sub-push block 432. Alternatively, the thicknesses of the second sub-push block 433 and the second sub-locking block 423 can also be the same as the thickness of the first sub-locking block 422, making the overall thickness of the push block 43 and the lock block 42 uniform. This facilitates installation and allows for sufficient space within the first clamping arm 10 to place the push block 43 and the lock block 42, saving space and reducing the overall volume of the leaf extension device 1. Figures 20 to 22 When the locking block 42 is not blocking the second clamping arm 20, the locking block 42 retracts into the first clamping arm 10, and at this time the push block 43 moves to the farthest position. Figures 17 to 19 When the locking block 42 blocks the second clamping arm 20, the locking block 42 extends from the first clamping arm 10, thereby blocking the rotation of the pushing part 22 and the second clamping arm 20. At this time, the push block 43 moves to the closest position. The locking and unlocking states of the locking block 42 can be achieved by pushing the push block 43 under the action of the push rod 50.

[0064] Furthermore, the first sub-lock block 422 has a first inclined surface 4221 facing the pushing part 22, and the first sub-lock block 422 also has a second inclined surface 4222 connected to the first inclined surface 4221. The pushing part 22 has a third inclined surface 221 opposite to the first inclined surface 4221. The first inclined surface 4221 and the third inclined surface 221 are parallel, and the second inclined surface 4222 and the third inclined surface 221 form a certain angle. That is, the second inclined surface 4222 of the first sub-lock block 422 is gradually tapered in the direction away from the second sub-lock block 423. By providing a first inclined surface 4221 and a second inclined surface 4222 to the first sub-locking block 422, and setting the first inclined surface 4221 parallel to the third inclined surface 221, and the second inclined surface 4222 forming a certain angle with the third inclined surface 221, the first sub-locking block 422 can extend to different degrees when it extends from the first clamping arm 10. When it extends, only the second inclined surface 4222 is exposed from inside the first clamping arm 10. At this time, the second inclined surface 4222 of the first sub-locking block 422 blocks the pushing part 22 because the second inclined surface... The first clamping block 4222 and the third inclined plane 221 have a certain angle, which allows the pushing part 22 to rotate slightly, thus slightly opening the second clamping arm 20. This prevents the second clamping arm 20 from forcibly compressing the thicker primary leaflet 4 when the first clamping arm 10 and the second clamping arm 20 are clamped, avoiding damage to the primary leaflet 4. When the second clamping arm 20 is closed, it has a certain angle with the horizontal direction, meaning it is slightly open, preventing excessive pressure on the thicker primary leaflet 4. Simultaneously, in this state, the first locking block 422 still blocks the second clamping arm 20, ensuring that it will not be lifted during puncture, thus improving the success rate of the surgery. When a native leaflet 4 of normal thickness is clamped, the first sub-locking block 422 extends from the first clamping arm 10, allowing the first inclined surface 4221 and the second inclined surface 4222 to simultaneously protrude from within the first clamping arm 10. At this time, the first inclined surface 4221 of the first sub-locking block 422 blocks the pushing part 22. The first inclined surface 4221 is parallel to the third inclined surface 221 of the pushing part 22, preventing the pushing part 22 from rotating in this state. When the second clamping arm 20 is closed, it can achieve a horizontally closed state, ensuring the capture effect of the native leaflet 4 of normal thickness. By providing the first inclined surface 4221 and the second inclined surface 4222 on the first sub-locking block 422, the leaflet extension device 1 can clamp native leaflets 4 of different thicknesses, greatly improving the applicability of the device. In this embodiment, the proximal end of the push rod 50 may also be provided with the third fixing member 64, the fourth fixing member 65, the second sliding block 66 and the second elastic member 67 as described in the above embodiments, so as to achieve the same effect as in the above embodiments, which will not be described again here.

[0065] In one or more embodiments of this application, the leaflet extension device 1 further includes a plate fastener 70, which controls the opening / closing rod 30 and the push rod 50 to move in opposite directions. Figure 3 and Figure 4 As shown, when controlling the movement of the opening / closing rod 30 and the push rod 50, the plate fastener 70 can be connected to both the first sliding block 62 and the second sliding block 66. This allows the opening / closing rod 30 and the push rod 50 to move simultaneously when the plate fastener 70 is rotated. Since the opening / closing rod 30 is used to open the second clamping arm 20 and the push rod 50 is used to block the second clamping arm 20 from opening, their movements are set in opposite directions. This ensures that when the opening / closing rod 30 opens the second clamping arm 20, the push rod 50 moves to a position that does not block the second clamping arm 20 from opening, and when the second clamping arm 20 closes, the push rod 50 moves to a position that blocks the second clamping arm 20 from opening.

[0066] In one or more embodiments of this application, the leaflet elongation device 1 includes a first control member and a second control member. The first control member controls the opening / closing rod 30 to move proximally or distally, and the second control member controls the push rod 50 to move proximally or distally. To facilitate operation and avoid confusion regarding the movement directions of the opening / closing rod 30 and the push rod 50, the first and second control members can be separately provided to control the movement of the opening / closing rod 30 and the push rod 50, respectively, to achieve the effect of opening the second clamping arm 20 or preventing the second clamping arm 20 from opening.

[0067] The above are merely preferred embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A leaflet elongation device, characterized in that, The leaflet elongation device includes: Delivery conduit; The first clamping arm is fixed to the distal end of the delivery conduit; The second clamping arm is rotatably connected to the proximal end of the first clamping arm; An opening / closing lever is connected to the proximal end of the second clamping arm and is used to open or close the second clamping arm; A locking assembly includes a blocking member and a push rod connected to the blocking member, the push rod being used to drive the blocking member to prevent the second clamping arm from opening; The blocking member includes a locking block and a push block for moving the locking block. The push rod is located at the proximal end of the push block. The push block has a protruding boss. The locking block has a groove for the boss to move. The boss moves in the groove, thereby driving the locking block to move. The second clamping arm includes a pushing part connected to the opening and closing rod, and a rotating part extending from one side of the pushing part to the proximal end. The locking block is used to prevent the pushing part from rotating so as to prevent the second clamping arm from opening.

2. The leaflet elongation device according to claim 1, characterized in that, The second clamping arm includes a pushing part connected to the opening and closing rod, and a rotating part extending from one side of the pushing part toward the proximal end. The blocking member is used to prevent the rotating part from rotating to prevent the second clamping arm from opening.

3. The leaflet elongation device according to claim 2, characterized in that, The distal end of the blocking member is tapered to form an inclined surface.

4. The leaflet elongation device according to claim 1, characterized in that, The opening and closing rod is fixed with a first fixing member and a second fixing member at a certain distance from the first fixing member. A first sliding block is sleeved on the opening and closing rod. The first sliding block is located between the first fixing member and the second fixing member and can move axially on the opening and closing rod. A first elastic member is also sleeved on the opening and closing rod. The first elastic member is located between the first fixing member and the first sliding block.

5. The leaflet elongation device according to claim 1, characterized in that, The push rod has a third fixing member fixed at its proximal end and a fourth fixing member at a certain distance from the third fixing member. A second sliding block is sleeved on the push rod. The second sliding block is located between the third fixing member and the fourth fixing member and can move axially on the push rod. A second elastic member is also sleeved on the push rod. The second elastic member is located between the fourth fixing member and the second sliding block.

6. The leaflet elongation device as described in claim 1, characterized in that, The push block includes a first sub-push block and a second sub-push block integrally formed with the first sub-push block. The boss protrudes from the second sub-push block. The locking block includes a first sub-locking block and a second sub-locking block integrally formed with the first sub-locking block. The sum of the thicknesses of the second sub-locking block and the second sub-push block is equal to the thickness of the first sub-push block.

7. The leaflet elongation device as described in claim 6, characterized in that, The first sub-lock block has a first inclined surface facing the pushing part, and the first sub-lock block also has a second inclined surface connected to the first inclined surface. The pushing part has a third inclined surface opposite to the first inclined surface. The first inclined surface and the third inclined surface are parallel, and the second inclined surface and the third inclined surface form a certain angle.

8. The leaflet elongation device as described in claim 1, characterized in that, The leaflet extension device also includes a plate fastener, which can control the opening and closing rod and the push rod to move in opposite directions.

9. The leaflet elongation device as described in claim 1, characterized in that, The leaflet extension device includes a first control element and a second control element. The first control element controls the opening and closing rod to move towards the proximal end or the distal end, and the second control element controls the push rod to move towards the proximal end or the distal end.

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