Mitral valve clamp device capable of preventing control rod from being broken

Abstract

The invention provides a mitral valve clamp device for preventing a control rod from being broken. The mitral valve clamp device comprises a handle shell; the flexible sheath tube extends from the handle shell to the far end; a control rod extending through the flexible sheath tube, the distal end of the control rod being detachably connected to the valve clip; and a control mechanism connected to the handle housing. Wherein the control mechanism comprises a movable element, a fixed element and a limiting pin, the fixed element comprises a stepped interface, and the limiting pin is provided with a circumferential boss. When the valve clamp clamps the mitral valve leaflet, traction force generated on the valve clamp can be transmitted to the fixing element through the control rod so as to pull the fixing element to axially move towards the far end relative to the limiting pin and the moving element until the circumferential boss abuts against the step interface to lock the limiting pin. Therefore, the limiting pin is prevented from being pulled out in advance before the traction force is released, the huge risk that the control rod is broken due to torsion is finally avoided, the success rate of an operation is increased, and huge damage to the valve leaflet is further avoided.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and in particular to a mitral valve clamp device for preventing control rod breakage. Background Technology

[0002] The mitral valve is a one-way valve located between the left atrium and left ventricle of the heart. A normal, healthy mitral valve controls the flow of blood from the left atrium to the left ventricle, while preventing blood from flowing from the left ventricle to the left atrium. Under normal circumstances, when the left ventricle contracts, the edges of the mitral valve leaflets completely close, preventing blood from flowing back from the left ventricle to the left atrium. However, when the leaflets, chordae tendineae, or annulus of the mitral valve become diseased, the leaflets may not close properly. In this case, when the left ventricle contracts, the mitral valve may not close completely, causing blood to flow back from the left ventricle to the left atrium, resulting in a series of pathological or physiological changes known as "mitral regurgitation."

[0003] Edge-to-edge repair of the mitral valve is an effective treatment for mitral regurgitation. Specifically, it involves fixing the edges of the anterior and posterior leaflets of the mitral valve that cannot properly align together using sutures or clamps, thereby reducing the leaflet gap and creating a double-perforated structure at the mitral valve orifice. This reduces the total area of ​​the mitral valve orifice, thus reducing or eliminating regurgitation. Traditional edge-to-edge mitral valve repair is performed under direct visualization during surgery, usually requiring open-chest surgery and establishing extracorporeal blood circulation, thus carrying a high risk. With advancements in technology, various minimally invasive and interventional procedures have been developed. These procedures only require a small incision in the patient's body, through which a valve clip is delivered to the diseased mitral valve using a delivery device. The valve clip holds and fixes part of the edges of the two leaflets together, creating a double-perforated structure at the mitral valve orifice, thereby reducing regurgitation.

[0004] Valve clips typically employ bilateral clamping arms and bilateral barbed springs to clamp the valve leaflets individually before closing as a whole, holding the edges of the two leaflets together. Existing delivery devices usually use the back-and-forth movement of a control lever to control the opening and closing of the clamping arms. The clamping arms typically need to provide a large clamping force to hold the leaflets tightly, preventing the valve clip from dislodging due to insufficient clamping caused by the rhythmic beating of the heart. After the valve clip has clamped, the control lever is also used to be twisted to release the valve clip. Given that the control lever is generally a slender shaft, if it is still under stress at this point, twisting the control lever can easily cause it to break, further leading to surgical failure or other serious damage. Summary of the Invention

[0005] The purpose of this invention is to provide a mitral valve clip device that prevents the control rod from breaking. It can limit the premature pull-out of the limiting pin, thereby avoiding the huge risk of the control rod breaking due to rotation or torsion. This not only improves the success rate of the operation, but also further avoids the huge damage to the valve leaflet.

[0006] To achieve the above objectives, the present invention provides a mitral valve clamp device for preventing control lever breakage, comprising: Handle casing; A flexible sheath extending distally from the handle housing; A control rod extending through the flexible sheath, the distal end of which is detachably connected to a valve clip; and A control mechanism connected to the proximal end of the handle housing, the control mechanism comprising: A movable element having an axially penetrating first cavity and a radially penetrating second cavity, the second cavity communicating with the first cavity; A fixing element is fixed to the proximal end of the control lever and extends coaxially through the first cavity; the fixing element has a radially penetrating third cavity that communicates with the second cavity; the fixing element includes a stepped interface formed from the proximal inner wall of the third cavity; and A limiting pin is provided, which can be sequentially inserted into the second cavity and the third cavity to lock the moving element and the fixed element. The limiting pin has a circumferential boss at one end located in the third cavity. When the valve clamp clamps the mitral valve leaflet, the traction force generated on the valve clamp can be transmitted to the fixing element through the control rod, thereby pulling the fixing element axially towards the distal end relative to the limiting pin and the moving element until the circumferential boss abuts against the stepped interface, thereby locking the limiting pin to prevent the limiting pin from being pulled out of the third cavity before the traction force is released.

[0007] This invention, by providing a circumferential boss on the limiting pin and a stepped interface on the fixing element, allows the fixing element to move axially distally relative to the limiting pin and the moving element under the tension of the control rod. This forces the stepped interface of the fixing element to limit the circumferential boss of the limiting pin, thus avoiding the significant risk of the limiting pin being prematurely pulled out and ultimately causing the control rod to break. Therefore, the mitral valve clip device provided by this invention not only improves the success rate of surgery but also further avoids significant damage to the valve leaflets. Attached Figure Description

[0008] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0009] Figure 1 A schematic diagram of the mitral valve clamp device in some embodiments is shown.

[0010] Figure 2 It shows Figure 1 A schematic diagram of the interior of the handle casing.

[0011] Figure 3 A three-dimensional structural diagram of the control mechanism is shown.

[0012] Figure 4-5 A schematic diagram of two states of the control mechanism is shown.

[0013] Figure 6 A schematic diagram of the connection structure between the drive element, the handle housing, and the moving element is shown.

[0014] Figure 7 A schematic diagram of the flexible sheath is shown.

[0015] Figure 8-9 A three-dimensional schematic diagram and a cross-sectional view of the fixing element are shown.

[0016] Figure 10 A schematic diagram of the first structure of the limit pin is shown.

[0017] Figure 11-12 A schematic diagram of the second structure of the limit pin is shown.

[0018] Figure 13 It shows Figure 11-12 A schematic diagram of the connecting pin in the middle.

[0019] Figure 14 A schematic diagram of the fixed knob is shown.

[0020] Figure 15 A schematic diagram of the drive element is shown.

[0021] Figure 16-18 The diagram illustrates a scenario where the mitral valve clamp device prevents the control lever from breaking when the valve clamp holds the valve leaflet.

[0022] The following detailed description, in conjunction with the accompanying drawings, will further illustrate the present invention. Detailed Implementation

[0023] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] Furthermore, the following descriptions of the embodiments are made with reference to the accompanying illustrations, which illustrate specific embodiments in which the invention can be implemented. Directional terms used in this invention, such as "up," "down," "front," "rear," "left," "right," "inner," "outer," and "side," are merely directional references to the accompanying illustrations. Therefore, the directional terms used are for better and clearer explanation and understanding of the invention, and are not intended to indicate or imply that the referred device or element must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the invention.

[0025] It should be noted that, in order to more clearly describe the mitral valve clip device for preventing control rod breakage provided by this invention, the limiting terms "proximal" and "distal" used in the specification are conventional terms in the field of interventional medicine. Specifically, "distal" refers to the end away from the operator during the surgical procedure, and "proximal" refers to the end closer to the operator during the surgical procedure; the direction of the rotational axis of an object such as a cylinder or tube is defined as the axial or longitudinal axis; circumferential is the direction around the axis of the object such as a cylinder or tube (perpendicular to the axis and also perpendicular to the cross-sectional radius); radial is the direction along the diameter or radius. It is worth noting that the "end" appearing in terms such as "proximal," "distal," "one end," "the other end," "first end," "second end," "initial end," "end," "both ends," "free end," "upper end," and "lower end" is not limited to the tip, end point, or end face, but also includes the portion extending axially and / or radially from the tip, end point, or end face on the element to which the tip, end point, or end face belongs. Unless otherwise defined, all technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The conventional terminology used in this specification is for the purpose of describing particular embodiments only and should not be construed as limiting the invention.

[0026] The present invention provides a mitral valve clamp device 100 to prevent the control lever 50 from breaking, so as to deliver the valve clamp 200 to the mitral valve of the human heart through a catheter path, so as to clamp the two leaflets of the mitral valve to avoid mitral regurgitation.

[0027] Specifically, such as Figure 1-2As shown, the mitral valve clamp device 100 includes a handle housing 30, a flexible sheath 40 extending distally from the handle housing 30, a control rod 50 extending through the flexible sheath 40, and a control mechanism 60 connected to the proximal end of the handle housing 30. The distal end of the control rod 50 is detachably connected to the valve clamp 200, and the proximal end of the control rod 50 is fixedly connected to the control mechanism 60. The control rod 50 can move axially within the flexible sheath 40 under the control of the control mechanism 60, thereby actuating the valve clamp 200 to open or close.

[0028] Further, please refer to Figure 3-5 As shown, the control mechanism 60 includes a moving element 61, a fixing element 62, and a limiting pin 63. The moving element 61 has an axially penetrating first cavity 611 and a radially penetrating second cavity 612, with the second cavity 612 communicating with the first cavity 611. The fixing element 62 is fixed to the proximal end of the control rod 50 and extends coaxially through the first cavity 611. The fixing element 62 has a radially penetrating third cavity 621, which communicates with the second cavity 612 of the moving element 61. The limiting pin 63 can be sequentially inserted into the second cavity 612 of the moving element 61 and the third cavity 621 of the fixing element 62 to lock the moving element 61 and the fixing element 62. The fixing element 62 includes a stepped interface 623 formed on the proximal inner wall of the third cavity 621, and the limiting pin 63 has a circumferential boss 630 at one end of the third cavity 621. The stepped interface 623 is used to abut against the circumferential boss 630 to prevent the limiting pin 63 from being removed from the third cavity 621 of the fixing element 62.

[0029] Therefore, as Figure 4-5 As shown, when the valve clamp 200 clamps the mitral valve leaflets, the pulling force F1 generated on the valve clamp 200 can be transmitted to the fixing element 62 via the control rod 50, thereby pulling the fixing element 62 axially relative to the limiting pin 63 and the moving element 61, until the circumferential boss 630 abuts against the stepped interface 623; that is, the fixing element 62 is moved from the limiting pin 63 and the moving element 61 to the distal end. Figure 4 Move to the position shown Figure 5 The position shown is used to lock the limiting pin 63, so as to prevent the limiting pin 63 from being pulled out of the third cavity 621 before the tension F1 is released.

[0030] Understandably, given the nature of edge-to-edge repair surgery, after the valve clip 200 is engaged, the operator needs to further pull out or lift the limiting pin 63 to release the constraint on the fixation element 62. At this point, the operator will further rotate the fixation element 62 to drive the connected control rod 50 to rotate, thereby unscrewing the control rod 50 from the valve clip 200 threads to release the valve clip 200. Given that the control rod 50 in the prior art is under significant tensile stress due to the large clamping force of the valve clip 200 on the valve leaflet, meaning the control rod 50 is very taut, there is a high risk that the control rod 50 may break due to synchronous rotation or torsion during the operator's rotation of the fixation element 62 to release the valve clip 200. This could ultimately lead to surgical failure and, in severe cases, further cause significant damage to the valve leaflet.

[0031] The present invention provides a circumferential boss 630 on the limiting pin 63 and a stepped interface 623 on the fixing element 62, so that the fixing element 62 can move axially to the far end relative to the limiting pin 63 and the moving element 61 under a large pulling force F1 of the control rod 50, thereby forcing the stepped interface 623 of the fixing element 62 to limit the circumferential boss 630 of the limiting pin 63, so as to prevent the limiting pin 63 from being prematurely pulled out or lifted.

[0032] Specifically, after the valve clip 200 completes clamping, the mitral valve clip device 100 of the present invention is located as follows: Figure 5 The state shown is as follows. Further manipulation of the mitral valve clamp locking mechanism (not shown) of the mitral valve clamp device 100 drives the locking member of the valve clamp 200 to lock the valve clamp 200; at this time, the valve clamp 200 is locked and cannot be driven to open or close. Therefore, when it is necessary to release the valve clamp 200, all stress or tension F1 of the control lever 50 must first be released, and then the limit pin 63 can be pulled out or lifted. The release of the tension F1 of the control lever 50 is achieved through the axial movement of the moving element 61.

[0033] Specifically, please also refer to Figure 5-6 As shown, the control mechanism 60 also includes a drive element 64. The drive element 64 rotates circumferentially near the proximal end of the handle housing 30 and is threaded onto the movable element 61. The movable element 61 is circumferentially limited by the handle housing 30. The circumferential rotation of the drive element 64 relative to the handle housing 30 drives the movable element 61 to move according to… Figure 5 The moving element 61 moves axially towards the distal end relative to the handle housing 30, as indicated by the middle arrow. This causes the limiting pin 63 to move axially towards the distal end relative to the fixing element 62, forcing the circumferential boss 630 to separate from the stepped interface 623, thereby releasing the locking of the limiting pin 63. That is, the moving element 61 and the limiting pin 63 are moved from... Figure 5 Move to the position shown Figure 4 The position is shown. Alternatively, the drive element 64 can be rotated further until the traction force F1 of the control rod 50 is completely released. Then, the fixation element 62 can be disengaged by pulling out or lifting the limiting pin 63, and the valve clip 200 can be released by rotating or twisting the fixation element 62. Since the traction force F1 of the control rod 50 has been completely released, the torsion transmitted to the control rod 50 via the fixation element 62 will not cause the control rod 50 to break, thus effectively improving the success rate of the surgery.

[0034] In some embodiments, the control lever 50 is a control wire. The flexible sheath 40 is provided with, for example, Figure 7 The axially extending central cavity 400 shown is for the control rod 50 to extend through. The cross-section of the central cavity 400 can be circular, square, or other irregular shapes, preferably circular.

[0035] In some embodiments, such as Figure 8-9 As shown, the third cavity 621 of the fixing element 62 includes an upper cavity 621a and a lower cavity 621b communicating with the upper cavity 621a. The diameter of the upper cavity 621a is adapted to fit the circumferential boss 630 of the limiting pin 63, allowing the circumferential boss 630 to pass through. The lower cavity 621b and the upper cavity 621a are axially misaligned on the proximal inner wall of the third cavity 621 to form a stepped interface 623 of the fixing element 62, and the diameter of the lower cavity 621b is larger than the diameter of the upper cavity 621a, so that the circumferential boss 630 can move axially within the lower cavity 621b. It is understood that the axial misalignment between the lower cavity 621b and the upper cavity 621a refers to a misalignment in the axial direction of the fixing element 62, or in the axial direction of the mitral valve clamp device 100.

[0036] Understandably, please refer to it again. Figure 4-5 As shown, under the action of the tensile force F1, the fixing element 62 drives the stepped interface 623 to move axially to the distal end until the circumferential boss 630 abuts against the stepped interface 623, while the circumferential boss 630 remains positioned within the lower cavity 621b. Under the action of the driving element 64, the moving element 61 drives the limiting pin 63 to move axially to the distal end, thereby driving the circumferential boss 630 to move axially to the distal end within the lower cavity 621b until it disengages from the stepped interface 623.

[0037] It should be noted that in some embodiments, the limiting pin 63a is an independent component, such as a detachable pin 63a. For example, Figure 10 As shown, the detachable pin 63a can be inserted into the moving element 61 and the fixed element 62 under the operator's control to lock them together, or removed from the moving element 61 and the fixed element 62 to release the lock between them.

[0038] Specifically, the detachable pin 63a includes a pin body 631 and a lifting ring 632 connected to one end of the pin body 631, with a circumferential boss 630a located at the other end of the pin body 631. An abutment boss 633 is also provided on the pin body 631 at a position between the circumferential boss 630a and the lifting ring 632. The abutment boss 633 is adjacent to and spaced apart from the circumferential boss 630a, allowing the abutment boss 633 to abut against the outer wall of the moving element 61. At this time, the distance between the abutment boss 633 and the circumferential boss 630a must be greater than the distance from the abutment boss 633 to the stepped interface 623, to ensure that the circumferential boss 630a is always positioned within the lower cavity 621b.

[0039] In other embodiments, the limiting pin 63b is a non-detachable pin and consists of multiple components. Specifically, such as... Figure 11-12 As shown, the non-detachable pin 63b includes a base 634, a lifting knob 635, a connecting pin 636, and a compression spring 637. The base 634 is disposed around the second cavity 612 of the moving element 61 for fixed connection to the moving element 61, for example, by connecting an external thread to an internal thread within the second cavity 612 and securing it with adhesive. One end of the connecting pin 636 extends through the base 634 to connect to the lifting knob 635 located on the base 634; the other end of the connecting pin 636 extends through the second cavity 612 of the moving element 61 and enters the third cavity 621 of the fixing element 62. Specifically, a circumferential boss 630b is provided at the other end of the connecting pin 636, and the circumferential boss 630b is movable in the third cavity 621 to selectively switch between abutting against the stepped interface 623 and disengaging from it. A compression spring 637 is sleeved around the connecting pin 636 and compressed between the base 634 and the connecting pin 636. The compression spring 637 is always in a compressed state to ensure that the lifting knob 635 is always pressed against the base 634 under the elastic force of the compression spring 637, so as to avoid wobbling.

[0040] like Figure 13As shown, the connecting pin 636 is generally a long, thin rod-shaped structure. One end of the connecting pin 636 has a pin hole for pin connection with the lifting knob 635. The other end of the connecting pin 636 has a circumferentially protruding circumferential boss 630b and abutting boss 6361. The abutting boss 6361 and the circumferential boss 630b are spaced apart along the axial direction of the connecting pin 636, and the abutting boss 6361 is positioned between the circumferential boss 630b and the lifting knob 635. The opposite sides of the abutting boss 6361 are used to abut against the base 634 and the compression spring 637, and the compression spring 637 is compressed between the base 634 and the abutting boss 6361. Pulling the lifting knob 635 upwards can drive the connecting pin 636 to compress the compression spring 637 upwards, and cause the circumferential boss 630b to disengage from the third cavity 621 of the fixing element 62, thereby releasing the locking of the fixing element 62.

[0041] It is understandable that the distance S between the circumferential boss 630b and the abutting boss 6361 must be greater than the distance from the abutting boss 6361 to the stepped interface 623, so as to ensure that the circumferential boss 630b can always be positioned in the lower cavity 621b of the fixing element 62 before the limiting pin 63b is removed or lifted.

[0042] Of course, to make it easier for the operator to hold the fixing element 62, such as Figure 14 As shown, the control mechanism 60 also includes a fixing knob 622, which is threaded onto the proximal end of the fixing element 62 for detachable connection. The fixing knob 622 is also provided with anti-slip texture in the circumference for easy grip by the operator.

[0043] In some embodiments, such as Figure 15 As shown, the drive element 64 includes a knob 641, an internally threaded component 642, and a fixed-force gear 643. The internally threaded component 642 is rotatably connected to the handle housing 30 and threadedly engages with the moving element 61. For example, the internal thread of the internally threaded component 642 is threaded onto the external thread of the moving element 61. The fixed-force gear 643 is fixedly fitted onto the external of the internally threaded component 642, and the knob 641 is fitted onto the external of the fixed-force gear 643 and engages with the ratchet and pawl of the fixed-force gear 643. If the driving force of the knob 641 on the fixed-force gear 643 is greater than or equal to a preset force value, the knob 641 will only rotate relative to the fixed-force gear 643, i.e., it will slip and rotate independently. This prevents the valve clamp 200 from over-clamping the leaflets and damaging them, and also avoids the risk of the control lever 50 breaking or being damaged due to excessive tension.

[0044] Please also refer to Figure 16-18As shown, the following detailed explanation illustrates the operation of the mitral valve clamp device 100 by clamping and releasing the valve clamp 200. In the initial state, the lifting ring 632 / lifting knob 635 of the limiting pin 63 is not pulled up. When the valve clamp 200 completes the operation as shown... Figure 16 After the leaflet is captured, the knob 641 is rotated forward to control the moving element 61 and the limiting pin 63 to move axially proximally, and the control lever 50 drives the two clamping arms of the valve clamp 200 to close until the leaflet is clamped. Please see [link to relevant documentation]. Figure 17 At this point, if the knob 641 is rotated forward, the knob 641 will slip in place, and the force can no longer be applied to the control lever 50 through the constant force gear 643 and the internal threaded part 642 to avoid over-clamping the leaflet.

[0045] Understandably, during the clamping process of the valve clip 200 on the leaflet, the tension on the control lever 50 will gradually increase, thereby pulling the fixed element 62, which is fixedly connected to it, to move axially towards the distal end relative to the moving element 61 and the limiting pin 63, so that the circumferential boss 630 of the limiting pin 63 abuts against the stepped interface 623. At this time, the limiting pin 63 is limited by the fixed element 61 and cannot be pulled up, thus reminding the operator to first rotate the knob 641 in the opposite direction to release all the stress on the control lever 50.

[0046] Therefore, when the knob 641 is rotated in the opposite direction to control the moving element 61 and the limiting pin 63 to move axially to the distal end, the fixing element 62 also moves axially to the distal end simultaneously until the circumferential boss 630 disengages from the abutment of the stepped interface surface 623. At this time, as Figure 18 As shown, the limiting pin 63 can disengage from the fixing element 62, thereby unlocking the fixing element 62 from the moving element 61. Next, the fixing knob 622 is rotated to unscrew the valve clip 200 via the control lever 50 thread. At this point, all stress on the control lever 50 is relieved, and the rotation of the fixing knob 622 will not cause the control lever 50 to break.

[0047] Understandably, the mitral valve clamp device 100 can be used for mitral valve repair to clamp the anterior and posterior leaflets of the mitral valve with the valve clamp 200, thereby preventing mitral regurgitation.

[0048] The above are the embodiments of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the embodiments of the present invention, and these improvements and modifications are also considered to be within the protection scope of the present invention.

Claims

1. A mitral valve clamp device for preventing control lever breakage, characterized in that, include: Handle casing; A flexible sheath extending distally from the handle housing; A control rod extends through the flexible sheath, the distal end of which is detachably connected to a valve clip; as well as A control mechanism connected to the proximal end of the handle housing, the control mechanism comprising: A movable element having an axially penetrating first cavity and a radially penetrating second cavity, the second cavity communicating with the first cavity; A fixing element is fixed to the proximal end of the control lever and extends coaxially through the first cavity; the fixing element has a radially penetrating third cavity that communicates with the second cavity; the fixing element includes a stepped interface formed from the proximal inner wall of the third cavity; and A limiting pin is provided, which can be sequentially inserted into the second cavity and the third cavity to lock the moving element and the fixed element. The limiting pin has a circumferential boss at one end located in the third cavity. When the valve clamp clamps the mitral valve leaflet, the traction force generated on the valve clamp can be transmitted to the fixing element through the control rod, thereby pulling the fixing element axially towards the distal end relative to the limiting pin and the moving element until the circumferential boss abuts against the stepped interface, thereby locking the limiting pin to prevent the limiting pin from being pulled out of the third cavity before the traction force is released.

2. The mitral valve clamp device as described in claim 1, characterized in that, The third cavity includes an upper cavity and a lower cavity communicating with the upper cavity; the diameter of the upper cavity is adapted to fit the circumferential boss so that the circumferential boss can pass through; the lower cavity and the upper cavity are axially offset on the proximal inner wall of the third cavity to form the stepped interface, and the diameter of the lower cavity is larger than the diameter of the upper cavity.

3. The mitral valve clamp device as described in claim 2, characterized in that, The control mechanism further includes a drive element that rotates circumferentially at the proximal end of the handle housing and is threaded onto the movable element, which is circumferentially limited by the handle housing. The circumferential rotation of the drive element relative to the handle housing drives the movable element to move axially to the distal end relative to the handle housing, thereby causing the limiting pin to move axially to the distal end relative to the fixed element, so as to force the circumferential boss to separate from the stepped interface to release the locking of the limiting pin.

4. The mitral valve clamp device as described in claim 3, characterized in that, Under the action of the pulling force, the fixing element drives the stepped junction surface to move axially to the distal end until the circumferential boss abuts against the stepped junction surface, and the circumferential boss is always positioned in the lower cavity; under the action of the driving element, the moving element drives the limiting pin to move axially to the distal end, so as to drive the circumferential boss to move axially to the distal end in the lower cavity until it disengages from the stepped junction surface.

5. The mitral valve clamp device as described in claim 4, characterized in that, The limiting pin is a detachable pin; the detachable pin includes a pin body and a lifting ring connected to one end of the pin body, the circumferential boss is provided at the other end of the pin body, and the pin body is also provided with an abutment boss at a position between the circumferential boss and the lifting ring, the abutment boss is adjacent to the circumferential boss and spaced apart from the circumferential boss, and the abutment boss can abut against the outer wall of the moving element.

6. The mitral valve clamp device as described in claim 4, characterized in that, The limiting pin is a non-detachable pin, which includes a base, a lifting knob, a connecting pin, and a compression spring. The base is arranged around the second cavity of the moving element to be fixedly connected to the moving element. One end of the connecting pin extends through the base to connect to the lifting knob located on the base. The other end of the connecting pin extends through the second cavity and enters the third cavity. The circumferential boss protrudes circumferentially from the end of the other end of the connecting pin. The compression spring is sleeved on the connecting pin and compressed between the base and the connecting pin.

7. The mitral valve clamp device as described in claim 6, characterized in that, The other end of the connecting pin is also provided with a circumferentially protruding abutment. The abutment and the circumferential abutment are spaced apart along the axial direction of the connecting pin, and the abutment is positioned between the circumferential abutment and the lifting knob. The compression spring is compressed between the base and the abutment.

8. The mitral valve clamp device as described in claim 5 or 7, characterized in that, The distance between the circumferential boss and the abutting boss / topping boss is greater than the distance from the abutting boss / topping boss to the stepped intersection surface.

9. The mitral valve clamp device as described in claim 8, characterized in that, The control mechanism also includes a fixing knob, which is threaded onto the proximal end of the fixing element for detachable connection to the proximal end of the fixing element; the fixing knob is also provided with anti-slip texture in the circumferential direction to facilitate the operator's grip.

10. The mitral valve clamp device as described in any one of claims 3-4, characterized in that, The driving element includes a knob, an internal threaded component, and a fixed-force gear. The internal threaded component is rotatably connected to the handle housing and threadedly engaged with the moving element. The fixed-force gear is fixedly sleeved on the outside of the internal threaded component. The knob is sleeved on the outside of the fixed-force gear and engages with the ratchet pawl of the fixed-force gear.

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