Adjustable bendable suture locking device

Abstract

The application provides a suture locking device with adjustable bending, which comprises a clamp head, a locking pin accommodated in the distal end of the clamp head, a push rod assembly arranged outside the clamp head, an outer support tube assembly sleeved outside the push rod assembly, and a bending adjusting mechanism; the outer support tube assembly comprises an adjustable bending section and a flexible outer tube connected to the proximal end of the adjustable bending section; the adjustable bending section comprises a plurality of unit sections, and each two adjacent unit sections are rotationally connected; the bending adjusting mechanism comprises at least a traction member connected to the adjustable bending section, and the traction member is axially pulled to make the adjustable bending section bend to the side where the traction member is located. The adjustable bending section has good torsional resistance in the bent state, which is sufficient to resist the force generated on the adjustable bending section when the push rod is driven to make the clamp head close or open, so as to prevent the adjustable bending section from being twisted or swung, thereby avoiding the misalignment of the locking pin and the locking point and the pulling of the suture.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and in particular to an adjustable suture locking device. Background Technology

[0002] In surgery, tying and securing sutures is a frequent procedure. Traditional surgery is performed under direct visualization, and the knots are usually tied manually by the surgeon. However, with technological advancements, minimally invasive and interventional surgeries are becoming increasingly common, such as laparoscopic surgery and transcatheter interventional procedures. These surgeries only require a small incision in the patient's body to insert instruments such as endoscopes or interventional catheters to reach the intended treatment site. In these procedures, tying or securing sutures within the patient's body typically requires the operator to perform the procedure from outside the patient's body through the small incision. This necessitates the use of suture locking devices.

[0003] An existing suture locking device includes a locking pin with a hollow inner cavity, a clamp that matches the locking pin and applies pressure to the locking pin to force it to deform, a push rod connected to the clamp and providing driving force to the clamp, and an outer tube sleeved over the push rod. The push rod is pushed forward to drive the clamp to compress the locking pin. After compression, the push rod is pulled backward to release the force applied to the clamp, thereby releasing the locking pin. Because it needs to be inserted into the human body, the outer tube must have a certain degree of flexibility to conform to the physiological and anatomical structure of the body's lumens. However, the distal end of the flexible outer tube can only passively enter the body along the suture to reach the predetermined site. In addition, the bending angle required at the distal end of the flexible outer tube is usually large. When the push rod inside is driven, the distal end of the flexible outer tube cannot provide sufficient support to counteract the effect of the push rod's movement on the distal end of the flexible outer tube. This can cause the distal end of the flexible outer tube to twist or swing, easily leading to misalignment of the locking pin and the locking point, suture pulling, and other abnormal phenomena, posing a risk of damaging the patient's internal tissues and blood vessels. Summary of the Invention

[0004] The purpose of this invention is to provide an adjustable suture knotting device to address the shortcomings of existing technologies.

[0005] The adjustable suture locking device provided by the present invention includes a clamp, a locking pin housed at the distal end of the clamp, a push rod assembly disposed outside the clamp, an outer support tube assembly sleeved outside the push rod assembly, and an adjusting mechanism; the outer support tube assembly includes an adjustable bending section and a flexible outer tube connecting the proximal end of the adjustable bending section; the adjustable bending section includes multiple unit sections, and each pair of adjacent unit sections is rotatably connected; the adjusting mechanism includes at least one traction member connected to the adjustable bending section, and axially pulls the traction member to bend the adjustable bending section toward the side where the traction member is located.

[0006] The adjustable bending suture locking device provided in this application connects the adjustable bending segment to the distal end of the flexible outer tube. The adjustable bending segment is composed of multiple unit sections connected in series. Each pair of adjacent unit sections is rotatably connected. The bending mechanism can drive the adjustable bending segment to bend towards the side where the traction member is located and maintain it at the required bending angle. Each unit section limits and supports each other, so that the adjustable bending segment has good anti-torsion performance, which is sufficient to resist the force generated on the adjustable bending segment when the drive push rod causes the clamp to close or open, preventing the adjustable bending segment from twisting or swinging, thereby avoiding the phenomenon of misalignment between the locking pin and the locking point, and pulling of the suture. Attached Figure Description

[0007] 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 from these drawings without creative effort.

[0008] Figure 1 This is a schematic diagram of the overall structure of an adjustable suture locking device provided in an embodiment of the present invention.

[0009] Figure 2 yes Figure 1 Enlarged view of the distal portion of the adjustable bend suture locking device.

[0010] Figure 3 yes Figure 1 Enlarged cross-sectional view of the proximal portion of the adjustable-bend suture locking device.

[0011] Figure 4 This is a three-dimensional structural diagram of the adjusting mechanism and the adjustable bending section in an adjustable suture locking device provided in an embodiment of the present invention.

[0012] Figure 5 yes Figure 4 A three-dimensional structural diagram of the traction and transmission components of the bending mechanism.

[0013] Figure 6 yes Figure 4 A sectional view of the adjustable bending section.

[0014] Figure 7 yes Figure 4 A three-dimensional structural diagram of one of the snake-bone-shaped unit sections of the adjustable bending segment.

[0015] Figure 8 yes Figure 4 The front view of several snake-shaped unit sections of the adjustable bending segment.

[0016] Figure 9 yes Figure 4 The front view of the bending state of the adjustable bend segment.

[0017] Figure 10 yes Figure 2 A cross-sectional view of the locking pin.

[0018] Figure 11 yes Figure 10 A schematic diagram of the structure after the locking pin is compressed and deformed.

[0019] Figure 12 yes Figure 2 A cross-sectional view of the clamp in the diagram.

[0020] Figure 13 yes Figure 12 A schematic diagram of the deformation state of the chuck in the middle.

[0021] Figure 14 yes Figure 2 A three-dimensional structural diagram of the push rod assembly in the diagram.

[0022] Figure 15 yes Figure 14 A cross-sectional view of the push rod assembly.

[0023] Figure 16 yes Figure 2 Enlarged view of the push rod assembly and some transmission components.

[0024] Figure 17 yes Figure 1 A three-dimensional structural diagram of the guide rod and outer support tube assembly.

[0025] Figure 18 - Figure 20 This is a schematic diagram of the process of repairing a diseased tricuspid valve using an adjustable suture locking device provided in an embodiment of the present invention.

[0026] Figure 21 yes Figure 20 Enlarged view of the XXI section.

[0027] Figure 22 - Figure 27 This is a schematic diagram illustrating the process of locking the suture thread within a locking pin using an adjustable suture locking device according to an embodiment of the present invention; wherein... Figure 23 yes Figure 22 Enlarged view of the distal portion of the adjustable-bend suture locking device. Figure 25 yes Figure 24 Enlarged view of the distal portion of the adjustable-bend suture locking device. Figure 27 yes Figure 26 Enlarged view of the distal portion of the adjustable bend suture locking device. Detailed Implementation

[0028] 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 some embodiments of the present invention, and not all 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.

[0029] Furthermore, the following descriptions of the embodiments are made with reference to the accompanying illustrations to 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; therefore, they should not be construed as limitations on the invention.

[0030] Orientation definition: For clarity of description, the end of the instrument closer to the operator during the operation is referred to as the "proximal end" and the end farther from the operator is referred to as the "distal end"; the axis refers to the direction parallel to the line connecting the center of the distal end and the center of the proximal end of the medical device; the above definitions are only for convenience of expression and should not be construed as limiting the present invention.

[0031] Please see Figures 1 to 3 The adjustable suture locking device 100 of the present invention is used for locking sutures to locking pins 300. One embodiment of the adjustable suture locking device 100 includes a clamp 22 disposed at the distal end for pressing the locking pin 300 to deform it, a push rod assembly 40 disposed outside the clamp 22 for controlling the opening and closing of the clamp 22, a transmission assembly 50 connected to the push rod assembly 40, an outer support tube assembly 80 sleeved outside the clamp 22, the push rod assembly 40 and the transmission assembly 50, a bending mechanism 60, and a handle 90 disposed at the proximal end.

[0032] The locking pin 300 is housed at the distal end of the clamp 22, which has a fixed axial position and is elastic. Specifically, the distal end of the clamp 22 is provided with a gap 25 for placing the locking pin 300, and the locking pin 300 is provided with a thread-passing cavity 301 along the axial direction for passing a suture thread.

[0033] The outer support tube assembly 80 includes a sleeve 82 for accommodating the clamp 22 and the push rod assembly, an adjustable bend 83 connected to the proximal end of the sleeve 82, and a flexible outer tube 85 connected to the proximal end of the adjustable bend 83.

[0034] The bending mechanism 60 includes at least one traction member 62 connected to the adjustable bending section 83, such that the adjustable bending section 83 bends toward the side where the traction member 62 is located.

[0035] The push rod assembly 40 includes a push rod 42 disposed outside the chuck 22.

[0036] The transmission assembly 50 includes a threaded transmission element 52 and a flexible inner core 53 with a certain axial length fixedly connected to the threaded transmission element 52. The distal end of the threaded transmission element 52 is rotatably connected to the push rod assembly 40. The flexible inner core 53 rotates to drive the threaded transmission element 52 to rotate, and the rotation of the threaded transmission element 52 drives the push rod assembly 40 to move axially.

[0037] When using the adjustable bending push-release suture locking device 100, the adjustable bending section 22 is bent to the ideal state by operating the bending adjustment mechanism 60 and its traction member 62, so that the sleeve 82 and the clamp 22 inside it approach the tissue to be sutured; the rotation of the flexible inner core 53 drives the threaded transmission member 52 to rotate, driving the push rod assembly 40 to move, so that the push rod 42 moves axially and acts on the clamp 22, thereby forcing the clamp 22 to compress the locking pin 300 to deform and lock the suture passing through the locking pin 300, or making the clamp 22 at least partially recover its deformation, so as to release the locking pin 300.

[0038] like Figure 1 and Figure 2As shown, the chuck 22 and push rod assembly 40 are housed within the sleeve 82. The outer support tube assembly 80 also includes an end cap 88 fixed to the distal end of the sleeve 82 and a connecting tube 84 fixed to the proximal end of the sleeve 82. The distal end of the adjustable bend 83 is fixedly connected to the proximal end of the connecting tube 84, and the proximal end of the adjustable bend 83 is connected to the distal end of the flexible outer tube 85. The inner cavity of the sleeve 82 houses the chuck 22 and push rod assembly 40. The chuck 22 is fixedly connected to the sleeve 82 so that the axial position of the chuck 22 is fixed. The flexible outer tube 85 and the adjustable bend 83 are sleeved outside the flexible inner core 53. The threaded transmission component 52 is rotatably connected to the connecting tube 84. Specifically, the threaded transmission component 52 and the connecting tube 84 are driven by a threaded engagement. In this embodiment, the threaded transmission component 52 is a transmission screw, and the inner cavity of the connecting tube 84 is provided with a threaded hole that engages with the transmission screw, and the transmission screw is screwed into the threaded hole. A connecting part 57 is provided at the distal end of the threaded transmission component 52. The connecting part 57 is rotatably connected to the push rod assembly 40. The threaded transmission component 52 rotates synchronously and moves axially to drive the push rod assembly 40 to move axially.

[0039] Furthermore, such as Figure 1 and Figure 2 As shown, the outer support tube assembly 80 also includes a connecting tube 86. The distal end of the connecting tube 86 is fixedly connected to the proximal end of the connecting cylinder 84. The distal end of the adjustable bend 83 is fixedly connected to the proximal end of the connecting tube 86. The proximal end of the adjustable bend 83 is fixedly connected to the distal end of the flexible outer tube 85. The proximal end of the flexible outer tube 85 is fixedly connected to the distal end of the handle 90. The inner cavities of the flexible outer tube 85, the adjustable bend 83, the connecting tube 86, and the connecting cylinder 84 are interconnected. The flexible outer tube 85 is preferably a laser-cut outer tube, a spiral structure, or a braided mesh structure. The material can be stainless steel, nickel-titanium alloy, cobalt-chromium alloy, etc. In this embodiment, the flexible outer tube 85 is preferably made of nickel-titanium alloy.

[0040] The sleeve 82 is hollow, with its proximal end fixedly connected to the distal end of the connecting sleeve 84, and its distal end fixedly connected to the end cap 88. A thread-passing groove 820 is formed on the peripheral wall of the sleeve 82 near the clamp 22, allowing the suture thread inserted within the locking pin 300 to pass through. A suture inlet 880, communicating with the inner cavity of the sleeve 82, is formed at the distal end of the end cap 88, through which the locking pin 300 is inserted into the inner cavity of the sleeve 82.

[0041] Please refer to the following: Figures 4 to 6In this embodiment, the traction member 62 is preferably a traction wire, which is axially movably inserted into the side wall of the adjustable bend section 83 and connected to the distal end of the adjustable bend section 83. Specifically, the distal end of the traction member 62 is fixed to the distal end of the adjustable bend section 83, and the traction member 62 can slide relative to the adjustable bend section 83 except for the distal end; when the traction member 62 is pulled towards the proximal end, the adjustable bend section 83 bends toward the side where the traction member 62 is located. The traction wire can be made of stainless steel, nickel-titanium alloy wire, or polymer material wire such as nylon or polytetrafluoroethylene.

[0042] In this embodiment, the adjustable bending section 83 is preferably a snake-shaped tube, which includes several interconnected snake-shaped unit sections 830. Each pair of adjacent snake-shaped unit sections 830 is rotatably connected, allowing the snake-shaped tube to bend towards the side where the traction member 62 is located. Each snake-shaped unit section 830 has an axially penetrating thread hole 835 in its sidewall for the traction wire to pass through. A stop block 621 is provided at the distal end of the traction wire. When the traction wire is pulled towards the proximal end, the stop block 621 stops at the distal end face of the farthest snake-shaped unit section 830 of the adjustable bending section 83. The traction wire slides within the thread hole 835 of the adjustable bending section 83, driving the adjustable bending section 83 to bend towards the side where the traction wire is located to obtain a suitable bending angle. The bending angle obtained by the adjustable bending section 83 varies depending on the degree of pulling of the traction wire.

[0043] Preferably, such as Figures 7 to 9As shown, adjacent snake-shaped unit segments 830 are nested and connected, and multiple snake-shaped unit segments 830 are connected in series to form an adjustable curved section 83. Specifically, each snake-shaped unit segment 830 has a convex circular structure 831 and a concave circular structure 832 at its distal and proximal ends, respectively. Adjacent snake-shaped unit segments 830 are connected by the convex circular structure 831 being embedded in the corresponding concave circular structure 832 to achieve a rotatable connection between adjacent snake-shaped unit segments 830. Each snake-shaped unit segment 830 includes a main body cylinder 833, the convex circular structure 831 being a fitting piece protruding from one end of the main body cylinder 833, and the concave circular structure 832 being a fitting hole at the opposite end of the main body cylinder 833. The fitting piece is rotatably embedded in the fitting hole. In this embodiment, one end of the main body cylinder 833 of each snake-bone unit section 830 is provided with two opposing convex circular structures 831, and the other end of the main body cylinder 833 of each snake-bone unit section 830 is provided with two opposing concave circular structures 832. In two adjacent snake-bone unit sections 830, the two convex circular structures 831 of one snake-bone unit section 830 are respectively nested within the two concave circular structures 832 of the other snake-bone unit section 830, and there is an axial gap between the two adjacent snake-bone unit sections 830 except at the joint between the convex circular structure 831 and the concave circular structure 832, so as to provide rotation space for the two adjacent snake-bone unit sections 830, allowing the corresponding convex circular structure 831 to rotate within the concave circular structure 832, which facilitates the bending of the entire adjustable bending section 83.

[0044] like Figure 8 As shown, further, in the straight-turn state, the included angle k between the adjacent end faces of two adjacent snake-shaped unit sections 830 of the adjustable bending section 83 is greater than or equal to 1.5 degrees, so that the axial gap between each pair of adjacent snake-shaped unit sections 830 gradually increases radially to provide sufficient space for the adjustable bending section 83 to bend. Preferably, the angle range of the central angle θ1 corresponding to the convex circular structure 831 and the central angle θ2 corresponding to the concave circular structure 832 is both greater than 180 degrees and less than 330 degrees, and the angle of the central angle θ1 corresponding to the convex circular structure 831 is greater than or equal to the angle of the central angle θ2 corresponding to the concave circular structure 832. This can prevent the convex circular structure 831 from separating from the concave circular structure 832, and also ensure that the root of the convex circular structure 831 has sufficient strength and does not deform. The root of the convex circular structure 831 is the intersection of the convex circular structure 831 and the corresponding main body cylinder 833.

[0045] In this embodiment, the snake-bone type unit segment 830 is preferably made of rigid materials such as stainless steel, nickel-titanium alloy, or cobalt-chromium alloy. Figure 9As shown, in the adjustable bending section 83, due to the nesting of the convex circular structure 831 and the concave circular structure 832, the adjacent two serpentine unit sections 830 mutually limit and support each other, which has good anti-torsion performance. It is sufficient to resist the force generated on the adjustable bending section 83 when the flexible inner core 53 inside the adjustable bending section 83 drives the push rod 42 to close or open the clamp 22, thereby preventing the adjustable bending section 83 from twisting or swinging. At the same time, with the pulling of the traction member 62, the adjustable bending section 83 can be maintained at the required bending angle and bending state.

[0046] It is understood that in other embodiments of the present invention, the adjustable bending section 83 may also be selected from other structures besides the snake-shaped tube, as long as the adjustable bending section 83 includes multiple unit sections, each adjacent two unit sections are rotatably connected, the adjustable bending section 83 can be driven to bend toward the side where the traction member 62 is located by the bending adjustment mechanism 60, and each unit section can limit and support each other.

[0047] like Figures 3 to 5 As shown, the bending mechanism 60 also includes a first driving member 63 and a transmission member 65 movably connected to the first driving member 63. The proximal end of the traction member 62 is connected to the transmission member 65. The first driving member 63 drives the transmission member 65 to move axially, thereby causing the traction member 62 to move axially, so that the adjustable bending section 83 bends.

[0048] Specifically, the first driving member 63 is rotatably disposed at the far end of the handle 90, and the transmission member 65 is threadedly connected to the first driving member 63. The rotation of the first driving member 63 can drive the transmission member 65 to move axially, thereby driving the traction member 62 to move axially, so that the adjustable bending section 83 bends toward the side where the traction member 62 is located.

[0049] In this embodiment, the first driving member 63 is a rotating cylinder with an internal thread 631 on its inner circumferential surface, and the rotating cylinder is rotatably disposed at the far end of the handle 90; the transmission member 65 is a slider with an external thread 651 screwed into the internal thread 631 of the first driving member 63; the handle 90 is provided with a guide groove 901 extending axially, and the transmission member 65 is slidably accommodated in the guide groove 901. When the first driving member 63 is rotated in the first direction, the transmission member 65, which is threadedly engaged with the first driving member 63, pulls the traction member 62 to move towards the proximal end along the guide groove 901. The stop block 621 at the distal end of the traction member 62 pulls the distal end of the adjustable bending section 83, causing the adjustable bending section 83 to bend. When the first driving member 63 is rotated in the second direction, which is opposite to the second direction, the transmission member 65 and the traction member 62 move axially towards the distal end. The force exerted by the stop block 621 at the distal end of the traction member 62 on the distal end of the adjustable bending section 83 is released, and the adjustable bending section 83 tends to return to its axial position under the force of the flexible inner core 53.

[0050] A first operating ring 633 is provided at the distal end of the outer peripheral surface of the first driving member 60. The first driving member 60 is rotated relative to the handle 90 by operating the first operating ring 633. The outer surface of the first operating ring 633 is provided with anti-slip texture to facilitate the rotation of the first driving member 63.

[0051] Please see Figure 10 and Figure 11 The locking pin 300 includes a locking cylinder 302 and a frustum 303 located at the distal end of the locking cylinder 302. The outer diameter of the frustum 303 of the locking pin 300 is larger than the outer diameter of the locking cylinder 302. A threading cavity 301 of the locking pin 300 passes axially through both opposite ends of the locking pin 300, and the threading cavity 301 is used to receive and pass sutures. When the locking cylinder 302 is subjected to mechanical force, it can be compressed to fix the suture in the threading cavity 301 of the locking pin 300. The locking pin 300 can be of various shapes, such as cylindrical, prismatic, elliptical, etc., as long as it has a threading cavity 301 for receiving sutures. The distal opening of the threading cavity 301 of the locking pin 300 has a smooth transition with the distal end face of the locking pin 300, avoiding cutting the suture or scratching the patient's internal tissues at the connection point. The locking pin 300 can be made of biocompatible materials such as stainless steel, pure titanium, nickel-titanium, and cobalt-chromium alloy, with pure titanium or stainless steel being preferred.

[0052] In this embodiment, as Figure 10 As shown, when the locking pin 300 is not compressed by external force, the initial height h1 of the middle part of the locking pin 300 is equal to the outer diameter of the locking cylinder 302 of the locking pin 300; as Figure 11 As shown, when the locking cylinder 302 of the locking pin 300 is crushed under the action of mechanical external force, the suture is fixed in the thread-passing cavity 301 of the locking pin 300. At this time, the height h2 of the locking pin 300 after being crushed is less than the initial height h1.

[0053] To improve the connection between the locking pin 300 and the suture after being gripped, an anti-slip structure can be provided on the inner circumferential surface of the threading cavity 301, such as anti-slip texture or roughening treatment. After the locking pin 300 is deformed by external gripping force, the friction between the suture and the inner circumferential surface of the threading cavity 301 increases, making the suture more firmly fixed in the threading cavity 301 of the locking pin 300.

[0054] Please refer to the description in the background section. Existing suture locking devices generally drive the clamp to press the locking pin by pushing a push rod forward. After pressing, the force on the clamp is released by pulling the push rod backward, thus releasing the locking pin. This causes another significant technical problem: because the direction of the force on the push rod pressing the locking pin is opposite to the direction of the force on the released locking pin, the force on the push rod is discontinuous, and the force curve has abrupt jumps in both directions. There is a violent jump at the moment when the push rod is pulled back and the clamp releases the locking pin, which can forcefully pull on the tissue and increase the risk of tissue tearing. To solve this technical problem, the present invention makes structural improvements to the clamp 22 and the push rod 42: a protrusion 220 is provided on the side of the clamp 22 facing the push rod 42, and a recess 420 corresponding to the protrusion 220 is provided on the side of the push rod 42 facing the clamp 22.

[0055] Specifically, please refer to Figure 12 and Figure 13 The chuck 22 includes an integrally formed first clamping portion 221 and a second clamping portion 223 disposed opposite to each other. A protrusion 220 is provided on the side of the first clamping portion 221 opposite to the second clamping portion 223. A gap 25 is formed between the first clamping portion 221 and the second clamping portion 223. When the threaded drive member 52 rotates, since the position of the connecting cylinder 84 is fixed, the threaded drive member 52 rotates and moves axially, pushing the push rod 42 to move axially. That is, the rotation of the threaded drive member 52 is converted into the axial movement of the push rod 42, so that the push rod 42 slides against the protrusion 220 of the chuck 22, thereby driving the first clamping portion 221 and the second clamping portion 223 to move towards each other and squeeze the locking pin 300, so that the locking pin 300 deforms and is fixed to the sewing line.

[0056] In this embodiment, the first clamping part 221 and the second clamping part 223 are integrally formed from a rigid material with elasticity. The proximal end of the chuck 22 is closed, and a pin 24 perpendicular to the axial direction passes through the proximal end of the chuck 22. Both ends of the pin 24 are fixed to the sleeve 82. The pin 24 positions the chuck 22 and prevents the chuck 22 from moving axially. The solid portion connecting the proximal ends of the first clamping part 221 and the second clamping part 223 provides support and power for the rebound of the first clamping part 221.

[0057] In this embodiment, the protrusion 220 is located at the distal end of the first clamping portion 221 on the side opposite to the second clamping portion 223. The protrusion 220 includes intersecting first outer inclined surface 2201 and second outer inclined surface 2203. The first outer inclined surface 2201 and the second outer inclined surface 2203 intersect on the side away from the second clamping portion 223. The first outer inclined surface 2201 gradually rises from its proximal end to its distal end, and the second outer inclined surface 2203 gradually decreases from its proximal end to its distal end. Figure 2 and Figure 13As shown, the first outer inclined surface 2201 corresponds to the side of the protrusion 220 that gradually rises. The distal end of the push rod 42 slides axially against the first outer inclined surface 2201 to compress the first clamping part 221 towards the second clamping part 223, thereby pressing the locking pin 300. The push rod 42 is pushed further until the protrusion 220 is gradually accommodated within the recess 420. The chuck 22 springs back, the first clamping part 221 moves away from the second clamping part 223, and the gap between the first clamping part 221 and the second clamping part 223 increases to a height h2 greater than the compressed height of the locking pin 300, thus releasing the locking pin 300. Further, the distal end of the first clamping part 221 has a first clamping tooth 2215 on the side facing the gap 25. The first clamping tooth 2215 includes several grooves, each extending approximately perpendicular to the axial direction.

[0058] like Figure 13 The first outer inclined surface 2201 is located at the proximal end of the protrusion 220, and extends gradually from its proximal end toward the distal end, inclined away from the second clamping portion 223. The second outer inclined surface 2203 is located at the distal end of the protrusion 220, and extends gradually from its proximal end toward the distal end, inclined toward the side closer to the second clamping portion 223. The first outer inclined surface 2201 and the second outer inclined surface 2203 of the protrusion 220 form an angle α, preferably 120° ≤ α < 180°. Furthermore, when the chuck 22 is in its initial state (or natural state, which refers to the state before the chuck 22 is pushed by the push rod 42), the slope of the first outer inclined surface 2201 is less than the slope of the second outer inclined surface 2203. Specifically, the angle range of the first included angle a1 between the first outer inclined surface 2201 and the vertical plane L perpendicular to the axial direction is 70°≤a1<90°, and the angle range of the second included angle a2 between the second outer inclined surface 2203 and the vertical plane L perpendicular to the axial direction is 50°≤a2<90°. The sum of the first included angle a1 and the second included angle a2 is equal to the included angle α between the first outer inclined surface 2201 and the second outer inclined surface 2203. It is worth noting that a2 < a1, or in other words, the slope of the first outer inclined surface 2201 is less than the slope of the second outer inclined surface 2203. The slope of the first outer inclined surface 2201 is relatively gentle, which helps to reduce the driving force of pushing the push rod 42 to push and press the chuck 22, allowing the chuck 22 to gradually deform.

[0059] like Figure 12 and Figure 13 As shown, the height difference H1 between the distal and proximal ends of the first outer bevel 2201 is greater than or equal to the diameter of the inner hole of the locking cylinder 302 of the locking pin 300, i.e., the thread-passing cavity 301, and less than the outer diameter of the locking cylinder 302 of the locking pin 300. This allows the first clamping part 221 and the second clamping part 223 to fully press the locking pin 300 when the push rod 42 pushes against the distal end of the first outer bevel 2201, so as to lock the suture thread passing through the locking pin 300.

[0060] Please refer to the following: Figure 12 and Figure 13 The height difference between the highest point of the protrusion 220 before deformation of the first clamping part 221 and after deformation and springback is less than the difference between the initial height h1 and the collapsed height h2 of the locking pin 300. Specifically, the vertical length between the highest point of the protrusion 220 before deformation of the first clamping part 221 and the axial plane of the axis of the pin 24 is H2 (e.g., Figure 12 As shown), after the first clamping part 221 is compressed and rebounds, the protrusion 220 is housed in the recess 420 of the push rod 42. At this time, the vertical length between the highest point of the protrusion 220 and the axial plane of the pivot pin 24 is H3 (as shown). Figure 13 As shown), H2 minus H3 yields the height difference. The height difference is less than the difference between the initial height h1 of the locking pin 300 before pressing and the height h2 of the locking pin 300 after being flattened, so as to facilitate the locking pin 300 to smoothly disengage from the gap 25 of the clamp 22. When the height difference is 0, the first clamping part 221 is completely restored to the initial state.

[0061] The intersection of the first outer inclined surface 2201 and the second outer inclined surface 2203 is rounded to facilitate the smooth passage of the push rod 42 across the intersection of the first outer inclined surface 2201 and the second outer inclined surface 2203, thus facilitating the smooth sliding of the push rod 42 from the first outer inclined surface 2201 to the second outer inclined surface 2203.

[0062] The second clamping part 223 has a second clamping tooth 2235 near its distal end on the side facing the first clamping part 221. The second clamping tooth 2235 includes a plurality of grooves, and the extension direction of each groove of the second clamping tooth 2235 is the same as the extension direction of the groove of the first clamping tooth 2215. When the first clamping part 221 and the second clamping part 223 approach each other, the first clamping tooth 2215 of the first clamping part 221 and the second clamping tooth 2235 of the second clamping part 223 are misaligned and can mesh with each other. The first clamping tooth 2215 and the second clamping tooth 2235 compress the locking pin 300 placed in the gap 25 into a curved shape. A horizontal guide surface 2236 is provided near the proximal end of the side of the second clamping part 223 away from the first clamping part 221. A thread hole 2237 communicating with the gap 25 is opened on the guide surface 2236 to facilitate the suture thread passing through the locking pin 300 to exit through the thread hole 2237. A positioning block 2233 is protruding from the far end of the side opposite to the first clamping part 221 of the second clamping part 223. The proximal end face of the positioning block 2233 is close to the wire hole 2237, and the proximal end face of the positioning block 2233 is a tangent surface 2238.

[0063] Please refer to the following: Figure 2 and Figure 14 - Figure 15The push rod assembly 40 also includes a base 44 axially movably inserted into the sleeve 82 and a tangent blade 46 fixedly connected to one side of the base 44. The proximal end of the push rod 42 is fixedly connected to the other side of the base 44 opposite to the tangent blade 46, and the push rod 42 extends axially to the distal end. A connecting part 57 is rotatably connected to the base 44, and an axial limiting structure is provided between the connecting part 57 and the base 44. The tangent blade 46 and the push rod 42 are spaced apart and opposite to each other, and the tangent blade 46 slides axially on the guide surface 2236.

[0064] A recess 420 is provided on the side of the push rod 42 close to the first clamping portion 221 and near the distal end of the push rod 42. The recess 420 includes an intersecting first inner inclined surface 4201 and a second inner inclined surface 4203, with the first inner inclined surface 4201 being further away from the distal end face of the push rod 42 than the second inner inclined surface 4203. When the protrusion 220 is accommodated within the recess 420, the first outer inclined surface 2201 corresponds to the first inner inclined surface 4201, and the second outer inclined surface 2203 corresponds to the second inner inclined surface 4203.

[0065] like Figure 15 As shown, the first inner inclined surface 4201 extends gradually from its proximal end to the distal end, tilting away from the first clamping part 221, while the second inner inclined surface 4203 extends gradually from its proximal end to the distal end, tilting towards the side closer to the first clamping part 221. The distal edge of the second outer inclined surface 4203 is rounded to allow the push rod 42 to slide smoothly against the second outer inclined surface 2203; the distal surface of the push rod 42 and the surface of the push rod 42 close to the clamp 22 are also rounded to allow the push rod 42 to slide smoothly against the first outer inclined surface 2201.

[0066] The angle b between the first inner inclined surface 4201 and the second inner inclined surface 4203 of the recess 420 is greater than or equal to the angle a between the first outer inclined surface 2201 and the second outer inclined surface 2203 of the protrusion 220, so that the protrusion 220 can be accommodated within the recess 420. Preferably, the third angle b1 between the first inner inclined surface 4201 and the vertical surface O perpendicular to the axial direction is greater than or equal to the first angle a1, and the fourth angle b2 between the second inner inclined surface 4203 and the vertical surface O perpendicular to the axial direction is greater than or equal to the second angle a2; the sum of the third angle b1 and the fourth angle b2 is equal to the angle b between the first inner inclined surface 4201 and the second inner inclined surface 4203.

[0067] like Figure 15As shown, the maximum depth H4 of the recess 420 is the vertical length between the highest point of the recess 420 and the surface of the push rod 42 close to the chuck 22. The maximum depth H4 is greater than or equal to the height difference H1 between the far end and the near end of the first outer inclined surface 2201, or the maximum height of the protrusion 220, to ensure that the protrusion 220 can be completely contained within the recess 420, providing sufficient rebound space for the chuck 22. When the protrusion 220 is contained within the recess 420, the height of the gap 25 is greater than the height h2 of the locking pin 300 after it is compressed, so as to facilitate the release of the locking pin 300.

[0068] The distal end of the tangent blade 46 is provided with a cutting edge 461. When the protrusion 220 is fully accommodated in the recess 420, the cutting edge 461 abuts against the tangent surface 2238 to cut the suture thread passing through the thread hole 2237.

[0069] It is understood that in other embodiments, the protrusion 220 may also be a protrusion in the shape of a hemisphere, a frustum, a cone, etc., and the recess 420 may also be a groove or gap in the shape of a hemisphere, a frustum, a cone, etc., that is adapted to the protrusion 220.

[0070] By providing a protrusion 220 on the clamp 22 and a recess 420 on the push rod 42, during the continuous axial pushing of the push rod 42 towards the distal end, the push rod 42 first abuts against the side of the gradually rising protrusion 220 of the clamp 22, forcing the clamp 22 to compress and deform the locking pin 300 to lock the suture thread passing through the locking pin 300. Then, the protrusion 220 gradually accommodates the recess 420, and the clamp 22 at least partially recovers its deformation to release the locking pin 300. That is, by continuously pushing the push rod 42 to perform the compression and release of the locking pin 300, the continuous pushing ensures the continuity of force on the push rod 42 and the clamp 22, which can avoid the violent jumping of the clamp 22 when releasing the locking pin 300 and prevent the clamp 22 and the locking pin 300 from tearing the sutured tissue, thereby greatly reducing the risk of tissue tearing.

[0071] Furthermore, as the push rod 42 is pushed axially towards the distal end to push against the gradually rising side of the protrusion 220 of the clamp 22, the resistance gradually increases during the pressing of the locking stud 300, and the driving force required by the push rod 42 increases accordingly. When the push rod 42 continues to be pushed axially towards the distal end and passes the highest point of the protrusion 220, the protrusion 220 is gradually accommodated in the recess 420, the resistance gradually decreases, and the driving force required by the push rod 42 decreases accordingly. Thus, the operator can know whether the locking stud 300 has been pressed and whether the suture has been locked by the perception of the operating feel.

[0072] Please refer to the following: Figure 2 , Figure 3 and Figure 16The flexible inner core 53 includes a flexible inner tube 54 connected to the proximal end of the threaded transmission member 52 and a core rod 56 inserted into the inner cavity of the flexible inner tube 54. A connecting part 57 connects the distal end of the threaded transmission member 52 to the base 44 of the push rod assembly 40. The flexible inner tube 54 is wound around the core rod 56, and the flexible inner tube 54 and the core rod 56 together constitute the flexible inner core 53. The distal end of the flexible inner core 53 is fixedly connected to the threaded transmission member 52. The flexible inner tube 54 is a tube with a certain supporting force, preferably a spiral structure or a braided mesh structure, and can be made of materials such as stainless steel, nickel-titanium alloy, or cobalt-chromium alloy. The outer diameter of the flexible inner tube 54 is smaller than the inner diameter of the flexible outer tube 85. The rotation of the flexible inner core 53 relative to the connecting cylinder 84 can drive the threaded transmission member 52 to rotate and move axially. The core rod 56 is inserted into the inner cavity of the flexible inner tube 54. The core rod 56 is a flexible mandrel. Preferably, the core rod 56 can be made of materials such as stainless steel, nickel-titanium alloy, or cobalt-chromium alloy. The core rod 56 facilitates the winding of wires to form the flexible inner tube 54 and enhances the torsional control of the flexible inner core 53.

[0073] The threaded transmission component 52 includes a transmission screw 521, which is screwed onto the internal thread of the connecting cylinder 84. The transmission screw 521 rotates and moves axially to drive the connecting part 57 to rotate relative to the base 44. At the same time, the distal end of the transmission screw 521 pushes against the base 44, the push rod 42, and the tangent blade 46, which move axially toward the distal end.

[0074] In other embodiments, the connecting part 57 may also be fixedly connected to the push rod assembly 40, but the connecting part 57 is rotatably connected to the threaded transmission member 52, and a limiting structure is provided between the connecting part 57 and the threaded transmission member 52 to prevent the connecting part 57 from moving axially relative to the threaded transmission member 52.

[0075] In this invention, the rotational torque of the flexible inner core 53 and the threaded transmission component 52 is converted into an axial thrust that drives the push rod 42 to move axially, thereby driving the push rod 42 to advance axially to the far end. Since the threaded transmission component 52 is rigid and short in length, the thrust loss is minimal, and the thrust can be smoothly and effectively transmitted to the push rod 42 to push the clamp 22. Thus, the clamp 22 can effectively compress the locking pin 300, causing the locking pin 300 to deform sufficiently, ensuring that the suture is reliably locked by the locking pin 300.

[0076] like Figure 1 and Figure 3As shown, the adjustable suture locking device 100 further includes a second driving member 70 for driving the flexible inner core 53 and the threaded transmission member 52 to rotate. The second driving member 70 is fixedly connected to the proximal end of the flexible inner core 53. The second driving member 70 can drive the flexible inner core 53 and the threaded transmission member 52 to rotate. In this embodiment, the second driving member 70 is a rotating member rotatably disposed at the proximal end of the handle 90, and the rotation of the second driving member 70 drives the flexible inner core 53 to rotate. The outer wall of the second driving member 70 is provided with an anti-slip mechanism 79, which facilitates the rotation of the second driving member 70 by gripping the anti-slip mechanism 79.

[0077] Please refer to the following: Figures 1 to 3 The second drive member 70 is rotatably connected to the proximal end of the handle 90. At least one length scale 915 is axially provided on the handle 90 near the second drive member 70, indicating the axial displacement of the second drive member 70. When the distal end face of the second drive member 70 is aligned with 0 on the length scale 915, the first clamping portion 221 and the second clamping portion 223 of the chuck 22 are fully open, and the push rod 42 does not apply any axial thrust to the chuck 22. When the second drive member 70 rotates and moves axially until its distal end face aligns with a certain scale value on the length scale 915, such as "6", the push rod 42 pushes against the highest point of the protrusion 220 of the chuck 22, and the first clamping portion 221 and... The second clamping part 223 compresses and deforms the locking pin 300 to fix the suture thread passing through the locking pin 300; when the second driving member 70 continues to rotate in the same direction and moves axially until its far end face is aligned with another scale value on the length scale 915, such as "7.5", the protrusion 220 on the chuck 22 is accommodated in the recess 420 of the push rod 42, and the first clamping part 221 of the chuck 22 elastically resets and moves away from the second clamping part 223, which facilitates the release of the locking pin 300.

[0078] Please refer to the following: Figure 1 , Figure 3 and Figure 17 The handle 90 also includes a guide rod 93. The first driving member 63 and the second driving member 70 are rotatably disposed at the distal and proximal ends of the handle 90, respectively. The proximal end of the flexible outer tube 85 is fixed to the distal end of the guide rod 93. Specifically, the guide rod 93 includes a guide post 931 fixedly inserted into the inner cavity of the first driving member 63 and a positioning plate 933 disposed at the distal end of the guide post 931, which covers the distal end of the first driving member 63. The outer surface of the guide post 931 is provided with a guide groove 901 along its length, and the transmission member 65 is slidably accommodated in the guide groove 901. The middle part of the handle 90 is provided with a through hole 903 along the axial direction. The through hole 903 passes through the positioning plate 933 and connects to the guide groove 901. The proximal end of the flexible inner core 53 is fixedly connected to the second driving member 70 after passing through the through hole 903, and the proximal end of the traction member 62 is fixedly connected to the transmission member 65 after passing through the through hole 903.

[0079] Please see Figures 18 to 27 The following uses tricuspid valve repair surgery as an example to illustrate the use of the adjustable suture locking device 100 provided by the present invention.

[0080] The tricuspid valve is a one-way valve between the right atrium (RA) and the right ventricle (RV), ensuring blood flows from the right atrium to the right ventricle. A normal, healthy tricuspid valve has multiple chordae tendineae. The leaflets of the tricuspid valve are divided into anterior, posterior, and septal leaflets. When the right ventricle is in diastole, all three leaflets are open, allowing blood to flow from the right atrium to the right ventricle. When the right ventricle is in systole, the chordae tendineae are stretched, preventing the leaflets from being pushed into the atrium by the blood flow. The anterior, posterior, and septal leaflets close properly, ensuring blood flows from the right ventricle through the pulmonary valve (PV) to the pulmonary artery. If the tricuspid valve is diseased, when the right ventricle is in systole, the tricuspid valve cannot return to a fully closed state normally, resulting in incomplete closure. The force of the blood flow can further cause the leaflets to dislodge into the right atrium, causing blood regurgitation. For tricuspid regurgitation, sutures can be implanted into each leaflet via interventional procedures. Then, the locking device described in this invention is used to lock the sutures together on each leaflet to achieve edge-to-edge repair. The specific process is as follows:

[0081] Step 1: As Figure 18 As shown, one or more sutures 500 with elastic pads 501 are first implanted into the anterior leaflet, posterior leaflet and septal leaflet of the patient's tricuspid valve. The point contact between the suture 500 and the leaflet is changed to the surface contact between the elastic pad 501 and the leaflet, which can effectively reduce the risk of leaflet tear.

[0082] Step 2: Outside the patient's body, insert all the multiple sutures 500 on the three leaflets into the threading cavity 301 of the locking pin 300 of the adjustable suture locking device 100, and pass the proximal end of the suture 500 through the threading cavity 301 of the locking pin 300, the gap 25 between the first clamping part 221 and the second clamping part 223 and the threading hole 2237 in sequence, and exit from the threading groove 820 of the sleeve 82;

[0083] Step 3: As Figure 19 , Figure 22 and Figure 23 As shown, the distal end of the suture locking device 100 is pushed into the right atrium of the heart via the femoral vein, approaching the leaflet of the tricuspid valve. The first drive member 63 of the bending adjustment mechanism 60 is rotated as needed, and the transmission member 65 pulls the traction member 62 to move axially proximally. The bending angle of the adjustable bending section 83 at the distal end of the suture locking device 100 is adjusted appropriately until the distal end of the adjustable suture locking device 100 reaches the predetermined position in the right atrium.

[0084] Step 4: Adjust the tightness of the three leaflet sutures 500mm apart, namely the anterior, posterior and septal leaflets. At the same time, use ultrasound to determine the state of the mildest tricuspid regurgitation. When this state is reached, stop adjusting and maintain the tightness of the three sets of sutures 500mm apart, that is, maintain the relative position between the anterior leaflet, posterior leaflet and septal leaflet of the tricuspid valve.

[0085] Step 5: As Figure 24 and Figure 25 As shown, the second drive member 70 on the rotating handle 90 drives the flexible inner core 53 and the threaded transmission member 52 to rotate and move axially to the far end. The threaded transmission member 52 pushes the push rod assembly 40 to move axially to the far end. During the process of the push rod assembly 40 moving axially to the far end, the push rod 42 moves relative to the chuck 22 to the far end. The far end of the push rod 42 continuously pushes and squeezes the first outer inclined surface 2201 on the first clamping part 221 until it reaches the highest point of the protrusion 220, so that the first clamping part 221 moves closer to the second clamping part 223. The first clamping tooth 2215 and the second clamping tooth 2235 grip the locking pin 300 contained in the gap 25 until the locking pin 300 is deformed, locking the three sets of stitching threads 500 in the locking pin 300 together.

[0086] Step 6: As Figure 26 and Figure 27 As shown, the second drive member 70 on the handle 90 continues to rotate in the same direction of rotation, the threaded transmission member 52 continues to move axially to the distal end, and the drive push rod 42 continues to move distally until the protrusion 220 on the first clamping part 221 enters the recess 420 of the push rod 42, the clamp 22 releases the locking pin 300, the suture blade 46 cuts the suture 500, and the locking pin 300 is released from the gap 25 of the clamp 22; then the excess suture 500 is pulled out of the patient's body;

[0087] Step 7: Remove the adjustable suture locking device 100 from the patient's body. During this process, the first drive member 63 of the adjusting mechanism 60 is rotated in the opposite direction, and the transmission member 65 and the traction member 62 move axially to the distal end, so that the adjustable section 83 tends to return to its original position, so as not to interfere with or compress blood vessels and tissues.

[0088] like Figure 20 , Figure 21 As shown, after the suture locking device 100 is removed from the patient's body, the locking pin 300 remains in the patient's body. At this time, the locking pin 300 fixes the three sets of sutures that pass through the anterior leaflet, posterior leaflet and septum leaflet respectively together, and the anterior leaflet, posterior leaflet and septum leaflet of the tricuspid valve are repaired.

[0089] The above description uses tricuspid valve repair as an example to illustrate the use of the suture locking device 100 of this application. It is understood that the suture locking device 100 can also be used for locking and fixing sutures during other interventional procedures.

[0090] 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. An adjustable bendable suture locking device, characterized by, The device comprises a clamp, a locking pin accommodated in the distal end of the clamp, a push rod assembly arranged outside the clamp, an outer support tube assembly sleeved outside the push rod assembly, and a bending adjusting mechanism; the push rod assembly comprises a push rod, and the outer support tube assembly comprises a flexible outer tube connected to the proximal end of the adjustable bending section; the adjustable bending section is a snake-shaped tube, which comprises a plurality of snake-shaped unit segments connected in series, and each adjacent two snake-shaped unit segments are rotationally connected, and are limited and supported to each other, so as to resist the force generated by the flexible inner core arranged in the adjustable bending section when the flexible inner core drives the push rod to close or open the clamp; the bending adjusting mechanism comprises at least a traction member connected to the adjustable bending section, and the traction member is axially pulled to bend the adjustable bending section to the side where the traction member is located.

2. The adjustable bend suture locking device of claim 1, wherein, The bending adjusting mechanism further comprises a first driving member and a transmission member movably connected to the first driving member, and the proximal end and the distal end of the traction member are connected to the transmission member and the adjustable bending section respectively, and the first driving member drives the transmission member to move axially to drive the traction member to move axially.

3. The adjustable bend suture lock of claim 2, wherein, The first driving member and the transmission member are connected through threaded transmission, and the first driving member rotates relative to the transmission member to drive the transmission member to move axially.

4. The adjustable bend suture lock of claim 2, wherein, The traction member is a traction wire, which is movably arranged in the side wall of the adjustable bending section in the axial direction and connected to the distal end of the adjustable bending section.

5. The adjustable bend suture lock of claim 1 or 4, wherein, The traction wire is movably arranged in the side wall of each snake-shaped unit segment.

6. The adjustable bend suture lock of claim 5, wherein, The distal end and the proximal end of each snake-shaped unit segment are respectively provided with convex circular structures and concave circular structures; the convex circular structures of the adjacent two snake-shaped unit segments are embedded in the corresponding concave circular structures, and the adjacent two snake-shaped unit segments have an axial gap.

7. The adjustable bend suture lock of claim 6, wherein, The angle range of the central angle of the convex circular structure and the central angle of the concave circular structure of each snake-shaped unit segment is greater than 180 degrees and less than 330 degrees, and the angle of the central angle of the convex circular structure is greater than or equal to the angle of the central angle of the concave circular structure.

8. The adjustable bend suture lock of claim 6, wherein, In the straight state of the adjustable bending section, the included angle between the adjacent two end faces of the adjacent two snake-shaped unit segments is greater than or equal to 1.5 degrees.

9. The adjustable bend suture lock of claim 1, wherein, The clamp itself has elasticity; the side of the push rod facing the clamp is provided with a recess, and the side of the clamp facing the push rod is provided with a corresponding protrusion.

10. The adjustable bend suture lock of claim 9, wherein, The protrusion comprises a first outer inclined surface and a second outer inclined surface intersecting with the first outer inclined surface; the first outer inclined surface gradually rises from the proximal end to the distal end, and the second outer inclined surface gradually decreases from the proximal end to the distal end.

11. The adjustable bend suture lock of claim 10, wherein, The included angle between the first outer inclined surface and the second outer inclined surface of the protrusion is greater than or equal to 120 degrees and less than 180 degrees.

12. The adjustable bend suture lock of claim 11, wherein, The slope of the first outer inclined surface is smaller than the slope of the second outer inclined surface.

13. The adjustable bend suture lock of claim 10, wherein, The recess is arranged at the distal end of the push rod, and the recess comprises a first inner inclined surface and a second inner inclined surface intersecting with the first inner inclined surface; when the protrusion is accommodated in the recess, the first outer inclined surface corresponds to the first inner inclined surface, and the second outer inclined surface corresponds to the second inner inclined surface.

14. The adjustable bend suture lock of claim 13, wherein, The included angle between the first inner inclined surface and the second inner inclined surface of the recess is greater than or equal to the included angle between the first outer inclined surface and the second outer inclined surface of the protrusion; and the maximum depth of the recess is greater than or equal to the maximum height of the protrusion.

15. The adjustable bend suture lock of claim 9, wherein, The transmission assembly further comprises a flexible inner core fixedly connected with the threaded transmission member, the flexible inner core movably penetrating the flexible outer tube and the adjustable bending section, and the threaded transmission member is rotationally connected with the push rod assembly; the rotation of the flexible inner core drives the rotation of the threaded transmission member, and the threaded transmission member drives the axial movement of the push rod.

16. The adjustable bend suture lock of claim 1, wherein, The outer support tube assembly further comprises a sleeve accommodating the collet and the push rod assembly, and the proximal end of the sleeve is connected with the distal end of the adjustable bending section; and the collet is fixedly connected with the sleeve.

17. The adjustable bend suture lock of claim 15, wherein, The second driving member is fixedly connected with the proximal end of the flexible inner core.

18. The adjustable bend suture lock of claim 15, wherein, The push rod assembly further comprises a tangent blade arranged at the opposite side of the push rod.

19. The adjustable bend suture lock of claim 3, wherein, The first driving member is rotationally arranged on the handle.

20. The adjustable bend suture lock of claim 17, wherein, The second driving member is rotationally arranged on the handle.

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