Adjustable seam lock buckle

Abstract

The present invention provides an adjustable suture lock buckle, which includes a fixed base and a lock core detachably connected to the fixed base, the fixed base is provided with a threading channel for threading sutures, the lock core and the fixed base are relatively fixed or movable to lock or loosen the sutures threaded in the threading channel. Therefore, in the process of locking the sutures, the lock core and the fixed base do not deform, thus avoiding damage to the lock buckle and sutures, and improving the service life and safety of the device; and the length of the sutures threaded in the threading channel can be adjusted by the movement or fixation between the lock core and the fixed base, so as to perform secondary adjustment according to the real-time situation.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and in particular to an adjustable suture lock buckle. Background Art

[0002] During surgery, it is often necessary to tie and fix the sutures. Traditional surgical operations are performed under direct vision, and the doctor usually ties the knots manually. However, with the advancement of technology, various minimally invasive and interventional surgeries are becoming increasingly common, such as laparoscopic surgery and transcatheter interventional surgery. These surgeries only require a small operating window to be cut in the patient's body, so that instruments such as endoscopes or interventional catheters can be inserted into the patient's body to reach the predetermined site for treatment. In this type of surgery, if the sutures in the patient's body need to be knotted or fixed, the operator is usually required to perform remote operations outside the patient's body through a small operating window.

[0003] The prior art discloses a suture locking device, which fixes the suture in the inner cavity of the locking nail by squeezing the locking nail to deform it. However, the deformed locking nail is easy to damage the suture, causing the suture to break; and once the suture is locked, the length and tightness of the suture cannot be adjusted again. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide an adjustable suture buckle which avoids damage to the buckle and suture and can adjust the suture length multiple times in view of the defects of the prior art.

[0005] In order to solve the above technical problems, the present invention provides an adjustable suture lock, which includes a fixed base and a lock core detachably connected to the fixed base, the fixed base is provided with a threading channel for threading sutures, and the lock core and the fixed base are relatively fixed or movable to lock or loosen the sutures threaded in the threading channel.

[0006] The fixed base of the adjustable suture lock buckle provided by the present invention is provided with a threading channel for inserting sutures. When the lock core is fixed relative to the fixed base, it can lock the sutures inserted in the threading channel. Neither the lock core nor the fixed base is deformed, thereby avoiding damage to the lock buckle and the sutures, thereby increasing the service life of the lock buckle and the sutures and improving the safety of the device. When the lock core is movable relative to the fixed base, it can loosen the sutures inserted in the threading channel to facilitate adjustment of the length and tightness of the sutures, thereby performing secondary adjustments according to real-time conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] In order to more clearly illustrate the technical solution of the embodiment of the present invention, the drawings required for use in the implementation mode will be briefly introduced below. Obviously, the drawings described below are some implementation modes of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0008] Figure 1 Schematic diagram of the structure of the suture locking device provided in the first embodiment of the present invention.

[0009] Figure 2 yes Figure 1 Schematic diagram of the three-dimensional structure of the adjustable suture lock buckle of the middle suture locking device.

[0010] Figure 3 yes Figure 2 Exploded view of the adjustable seam lock in .

[0011] Figure 4 yes Figure 3 Schematic diagram of the three-dimensional structure of the fixed base of the adjustable seam lock.

[0012] Figure 5 yes Figure 4 Cross-sectional view of the fixed base in FIG.

[0013] Figure 6 yes Figure 3 Schematic diagram of the three-dimensional structure of the lock core of the adjustable stitch lock buckle

[0014] Figure 7 yes Figure 5 Side view of the lock cylinder in FIG.

[0015] Figure 8 Schematic diagram of the thread locking state of the suture locking device provided in the first embodiment of the present invention.

[0016] Fig. 9 yes Figure 8 Schematic diagram of the locking state of the adjustable suture locking buckle of the suture locking device.

[0017] Fig.10 It is a schematic diagram of the three-dimensional structure of the adjustable suture lock buckle provided in the second embodiment of the present invention.

[0018] Fig.11 yes Fig.10 Exploded view of the adjustable seam lock in .

[0019] Fig.12 yes Fig.11 Schematic diagram of the three-dimensional structure of the fixed base.

[0020] Fig.13 yes Fig.12Cross-sectional view of the fixed base in FIG.

[0021] Fig.14 It is a schematic diagram of the thread locking state of the adjustable suture lock buckle provided by the second embodiment of the present invention.

[0022] Fig.15 Schematic diagram of the structure of a suture locking device provided in the third embodiment of the present invention.

[0023] Fig.16 yes Fig.15 Schematic diagram of the three-dimensional structure of the adjustable stitch lock.

[0024] Fig.17 yes Fig.14 Schematic diagram of the three-dimensional exploded view of the adjustable seam lock.

[0025] Fig.18 Schematic diagram of the thread locking state of the adjustable suture lock buckle provided in the third embodiment of the present invention. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] In addition, the following descriptions of the embodiments are with reference to the attached drawings to illustrate specific embodiments in which the present invention may be implemented. The directional terms mentioned in the present invention, such as "upper", "lower", "front", "back", "left", "right", "inner", "outer", "side", etc., are only with reference to the directions of the attached drawings. Therefore, the directional terms used are for better and clearer description and understanding of the present invention, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention.

[0028] Definition of orientation: For the sake of clarity, the end closer to the operator during surgery is referred to as the "proximal end" and the end farther from the operator is referred to as the "distal end"; the axial direction refers to the direction parallel to the line connecting the distal center and the proximal center of the medical device; the above definition is only for the convenience of expression and should not be construed as a limitation on the present invention.

[0029] See also Figures 1 to 3The present invention provides a suture locking device 100, which includes an adjustable suture lock buckle 20 and a lock buckle pushing mechanism 50. The adjustable suture lock buckle 20 includes a fixed base 22 and a lock core 24 detachably connected to the fixed base 22. The fixed base 22 is provided with a suture 300 (such as Fig. 9 The threading channel 220 (as shown), the lock core 24 and the fixed base 22 are relatively fixed or movable to lock or release the suture 300 installed in the threading channel 220.

[0030] In this embodiment, the adjustable suture lock buckle 20 is implanted into the patient's body through the push mechanism 50, and the push mechanism 50 drives the lock core 24 and the fixed base 22 to be relatively fixed or movable to lock or loosen the suture 300. The push mechanism 50 includes a bendable delivery tube 52 with a certain axial length and a control handle 54 arranged at the proximal end of the delivery tube 52, and the adjustable suture lock buckle 20 is accommodated at the distal end of the delivery tube 52; when using the suture locking device 100, the distal end of the delivery tube 52 is inserted into the patient's body through a small incision, and then the relative movement between the lock core 24 and the fixed base 22 is driven by the control handle 54 to fix the suture implanted in the tissue on the tissue. For example, the suture locking device 100 provided in this embodiment can reach the vicinity of the heart through the apex, femoral vein and atrial septum, and fix the suture 300 implanted in the valve leaflet on the papillary muscle, apex or ventricular wall as an artificial tendon.

[0031] The fixed base 22 of the adjustable suture lock buckle 20 provided by the present invention is provided with a threading channel 220 for inserting the suture 300. When the lock core 24 is fixed relative to the fixed base 22, it can lock the suture 300 inserted in the threading channel 220. Since the lock core 24 and the fixed base 22 do not deform, damage to the adjustable suture lock buckle 20 and the suture 300 is avoided, thereby improving the service life of the adjustable suture lock buckle 20 and the suture 300 and improving the safety of the device; when the lock core 24 moves relative to the fixed base 22, it can loosen the suture 300 inserted in the threading channel 220 to facilitate adjustment of the length and tightness of the suture 300, thereby performing secondary adjustments in real time according to clinical needs.

[0032] like Figure 2 and Figure 3As shown, in this embodiment, the adjustable suture lock buckle 20 also includes a fixing pin 26 connected between the lock core 24 and the fixed base 22. The fixing pin 26 is a smooth cylinder, and the material of the fixing pin 26 can be implantable silicone, PC or PEEK material. The lock core 24 is inserted into the fixed base 22 and is in clearance with the fixed base 22. At this time, the lock core 24 can move relatively axially in the fixed base 22. When the suture 300 passes through the inner cavity of the fixed base 22 and the threading channel 220, and the lock core 24 moves axially toward the distal end of the fixed base 22, the relative gap between the two is reduced, and the suture 300 can be squeezed. When the suture 300, the lock core 24 and the fixed base 22 cannot move further, the adjustable suture lock buckle 20 reaches a locked state, and at this time, the fixing pin 26 is radially inserted into the fixed base 22 and the lock core 24 in sequence, so that the lock core 24 is fixed in the fixed base 22, and the suture 300 is fixed in the adjustable suture lock buckle 20. After the adjustable suture lock buckle 20 is locked, the lock core 24 and the fixed base 22 are loosened again, and the doctor adjusts the length of the suture 300 by manually pulling, thereby realizing the adjustable function.

[0033] Please also read Figure 2 - Figure 5 The fixed base 22 is provided with a locking channel 222 along the axial direction, and the threading channel 220 passes through the locking channel 222. The fixed base 22 forms an abutment portion 223 at the intersection of the locking channel 222 and the threading channel 220. The suture 300 is passed through the threading channel 220 and the locking channel 222 and covered by the abutment portion 223. The lock core 24 is inserted into the locking channel 222 until the lock core 24 abuts against the abutment portion 223 to lock the suture 300.

[0034] The fixing base 22 is used to fit the tissue to fix the suture 300 to the papillary muscle, the apex, the ventricular wall and other parts. The fixing base 22 includes an anchoring portion 224 located at the distal end and a fixing portion 226 located at the proximal end. The inner cavities of the anchoring portion 224 and the fixing portion 226 are connected, that is, the locking channel 222 axially penetrates the anchoring portion 224 and the fixing portion 226. Specifically, the locking channel 222 of the fixing base 22 includes a locking cavity 2221 located at the distal end and a connecting cavity 2223 located at the proximal end. The threading channel 220 is connected to the locking cavity 2221; the locking cavity 2221 penetrates the anchoring portion 224, and the connecting cavity 2223 penetrates the fixing portion 226. In this embodiment, the anchoring portion 224 is roughly disc-shaped, and the anchoring portion 224 extends radially from the distal end of the fixing portion 226; the fixing portion 226 is roughly cylindrical, and the fixing portion 226 is located in the middle of the anchoring portion 224; the anchoring portion 224 is provided with at least one through hole 2241 around the fixing portion 226 for suturing the anchoring portion 224 to the tissue surface.

[0035] In other embodiments, the cross section of the fixing portion 226 parallel to the radial direction may be a rhombus, an ellipse, a polygon, etc.; the anchoring portion 224 may be an elliptical disk, a waist-shaped disk, or a polygonal disk, etc. The side wall of the fixing portion 226 is provided with at least one through threading channel 220 along the radial direction. The inner cavity at the distal end of the fixing portion 226 is a conical surface 2261 whose diameter gradually decreases from the proximal end to the distal end. Specifically, the cross section of the locking cavity 2221 through the axial centerline is conical, and the radial dimension of the locking cavity 2221 gradually decreases from the proximal end to the distal end, that is, the inner cavity of the locking cavity 2221 is the conical surface 2261; the connecting cavity 2223 is a circular cavity. The threading channel 220 is connected to the locking channel 222 and passes through the outer surface of the fixed base 22. Preferably, the threading channel 220 is connected with the locking channel 222 at the conical surface 2261, that is, the abutment portion 223 is located on the conical surface 2261; the distal end of the lock core 24 is a cone with a diameter gradually decreasing from the proximal end to the distal end, and the conical surface 2261 at the distal end of the inner cavity of the fixing portion 226 is adapted to the cone at the distal end of the lock core 24. Each threading channel 220 can be used to thread at least one suture 300, and the suture 300 covers the abutment portion 223. When the cone at the distal end of the lock core 24 abuts against the abutment portion 223, the suture 300 can be clamped and fixed. Specifically, when the lock core 24 is accommodated in the locking channel 222 of the fixed base 22, the cone at the distal end of the lock core 24 cooperates with the conical surface 2261 to squeeze the suture 300, thereby achieving the purpose of fixing the suture 300. Preferably, the taper range of the conical surface 2261 of the locking cavity 2221 is 30° to 40°.

[0036] In this embodiment, the height of the fixed base 22 along the axial direction is less than or equal to 4 mm, and the surface is smooth to avoid damaging the pericardial tissue. The inner wall of the fixed portion 226 is provided with a guide groove 2264 extending along the axial direction, that is, the guide groove 2264 is arranged on the inner wall of the connecting cavity 2221, the distal end of the guide groove 2264 extends to the adjacent threading channel 220, and the proximal end of the guide groove 2264 passes through the proximal surface of the fixed portion 226. The fixed base 22 is provided with smooth fillets at the contact position with the suture 300 to avoid damaging the suture. Specifically, the contact position of the abutment portion 223 with the suture 300 is provided with smooth fillets. The fixed base 22 is made of a biocompatible material, preferably a polymer material, such as implantable silicone, PC or PEEK. Preferably, in order to ensure the reliability of the fixed base 22, the hardness of the material used to make the fixed base 22 should be slightly greater than the hardness of the material used to make the lock core 24.

[0037] like Figure 5As shown, further, a clamping reinforcement piece 227 is provided on the inner surface of the fixed base 22 to increase the friction between the fixed base 22 and the lock core 24, and improve the locking force of the lock buckle on the suture 300. Specifically, in this embodiment, the clamping reinforcement piece 227 is a friction pad, which is attached to the surface of the abutment portion 223, and the lock core 24 squeezes the friction pad to deform it until the outer surface of the lock core 24, the clamping reinforcement piece 227, the suture 300 and the inner surface of the fixed base 22 (that is, the surface of the abutment portion 223) reach a friction balance to fix the suture 300.

[0038] In other embodiments, the clamping reinforcement 227 may also be one or a combination of two or more structures such as a rough surface, tiny ridges, bosses or other irregularly distributed protrusions protruding from the inner surface of the fixed base 22 (i.e., the surface of the abutment portion 223).

[0039] like Figure 3 As shown, the fixing pin 26 is detachably inserted into the fixing base 22 and the lock core 24 in the radial direction, so that the fixing base 22 and the lock core 24 are relatively fixed. Specifically, the fixing base 22 is provided with a first through hole 2266 penetrating the locking channel 222 in the radial direction, that is, the first through hole 2266 is opened on the side wall of the fixing portion 226, and the opposite ends of the first through hole 2266 pass through the outer peripheral surface of the fixing portion 226. The first through hole 2266 is located on both sides of the guide groove 2264; preferably, the axis of the first through hole 2266 is perpendicular to the center line of the two guide grooves 2264.

[0040] like Figure 5 As shown, in order to enhance the anchoring force between the fixed base 22 and the tissue, the anchoring portion 224 includes a fitting surface in contact with the tissue, which refers to the distal end surface of the anchoring portion 224 in this embodiment. Preferably, the fitting surface is at least partially anti-slip. Specifically, an anti-slip pad 228 (e.g., a felt sheet) is provided on the fitting surface to increase the friction between the fixed base 22 and the tissue to prevent the adjustable suture lock 20 from sliding. Active drugs can also be applied to the fitting surface to promote the endothelial cells of the tissue to crawl and grow on the fitting surface. A polymer coating made of a biocompatible material can also be covered on the fitting surface to enhance the biocompatibility between the fixed base 22 and the tissue. The fitting surface can also be provided with a plurality of through holes 2241 to reduce the overall weight of the adjustable suture lock 20, thereby preventing the overweight adjustable suture lock 20 from slipping or damaging the tissue, and at least one of the through holes 2241 can be used to fix the adjustable suture lock 20 on the tissue surface.

[0041] Please also read Figure 2 - Figure 3 and Figure 6 - Figure 7The lock core 24 includes a locking portion 242 at the distal end and a connecting portion 245 disposed at the proximal end of the locking portion 242. The locking portion 242 is a frustum, that is, the diameter of the locking portion 242 gradually decreases from the proximal end to the distal end; the connecting portion 245 is a cylinder. The connecting portion 245 of the lock core 24 can be detachably inserted into the connecting cavity 2221 of the fixed base 22. Since the threading channel 220 is connected to the locking cavity 2221, the locking portion 242 can be accommodated in the locking cavity 2221 of the fixed base 22 and abut against the abutting portion 223 to lock the suture 300. Preferably, the taper range of the locking portion 242 is 30 degrees to 40 degrees, so as to increase the matching length of the tapered surface of the lock core 24 and the fixed base 22, and enhance the locking force of the suture 300. More preferably, the taper of the locking line portion 242 is greater than the taper of the locking cavity 2221 , thereby increasing the locking force and preventing the lock core 24 from falling off from the locking channel 222 of the fixed base 22 .

[0042] The locking portion 242 and the connecting portion 245 have a smooth transition, and the two can be integrally formed or separately manufactured and then fixedly connected by welding, bonding, snapping, etc. In this embodiment, the locking portion 242 and the connecting portion 245 are preferably integrally formed.

[0043] At least one stopper 2452 is convexly provided on the outer circumference of the connecting portion 245, and the stopper 2452 can be slidably received in the guide groove 2264 of the fixed base 22 to limit the radial movement between the lock core 24 and the fixed portion 226, so that the lock core 24 can only move axially in the fixed portion 226. In this embodiment, the stopper 2452 is a convex block, and two stoppers 2452 are symmetrically convexly provided on the outer circumference of the connecting portion 245, and the two stoppers 2452 can be slidably received in the two guide grooves 2264 of the fixed base 22, respectively.

[0044] The connecting portion 245 is provided with a second through hole 2454 in the radial direction. When the lock core 24 is inserted into the locking channel 222 of the fixed base 22, the limiting member 2452 of the lock core 24 can move toward the distal end in the guide groove 2264 corresponding to the fixed base 22 until the second through hole 2454 is directly opposite to the first through hole 2266 of the fixed base 22, and the fixing pin 26 can be detachably installed in the first through hole 2266 and the second through hole 2454 to fix the lock core 24 in the fixed base 22; at this time, the locking wire portion 242 is fixedly abutted against the abutting portion 223.

[0045] Preferably, the contacting parts of the lock core 24 and the suture 300 are all provided with smooth rounded corners to avoid damaging the suture 300. The lock core 24 is made of a biocompatible material, preferably a polymer material, such as implantable silicone, PC or PEEK.

[0046] Preferably, a clamping reinforcement 2420 is provided on the outer surface of the thread locking portion 242 to increase the friction between the fixed base 22 and the lock core 24, and to improve the locking force of the lock buckle on the suture 300. Specifically, in this embodiment, the clamping reinforcement 2420 is a friction gasket, which is attached to the outer peripheral surface of the thread locking portion 242, and the lock core 24 squeezes the friction gasket to deform it until the friction balance is reached between the thread locking portion 242, the clamping reinforcement 2420, the suture 300 and the inner surface of the fixed base 22, so as to fix the suture 300.

[0047] In other embodiments, the clamping reinforcement member 2420 may also be one or a combination of two or more structures such as a rough surface, tiny ridges, bosses or other irregularly distributed protrusions protruding from the outer surface of the locking portion 242.

[0048] Please also read Figure 1 and Figure 8 - Fig. 9 The following uses the mitral valve repair surgery as an example to illustrate the use of the suture locking device 100 and the adjustable suture locking buckle 20 provided by the present invention.

[0049] The mitral valve is a one-way "valve" between the left atrium (LA) and the left ventricle (LV), which ensures that blood flows from the left atrium to the left ventricle. A normal and healthy mitral valve has multiple tendons. When the left ventricle is in diastole, the mitral valve leaflets are open, and blood flows from the left atrium to the left ventricle; when the left ventricle is in contraction, the tendons are stretched to ensure that the valve leaflets are not washed to the atrial side by the blood flow, and the mitral valve leaflets are well closed, thereby ensuring that blood flows from the left ventricle through the aortic valve (AV) to the aorta. See Figure 8 The leaflets of the mitral valve are divided into anterior leaflet 401 and posterior leaflet 403. If the mitral valve is diseased, when the left ventricle is in a contracted state, the anterior leaflet 401 and the posterior leaflet 403 cannot return to a closed state as in a normal state, and the force of blood flow will further cause the anterior leaflet 401 and the posterior leaflet 403 to dislodge into the left atrium, causing blood reflux.

[0050] The suture locking device 100 and the adjustable suture locking buckle 20 provided in the first embodiment of the present invention can be used for artificial chordal implantation of the mitral valve, and the use process is as follows:

[0051] Step 1: First, at least one group of sutures 300 with elastic gaskets 301 are implanted into the anterior leaflet 401 of the mitral valve. Each group of sutures 300 has one or more sutures. Since the sutures 300 are provided with elastic gaskets 301, the point contact between the sutures 300 and the leaflet can be transformed into surface contact between the elastic gaskets 301 and the leaflet, which can effectively reduce the risk of leaflet tearing.

[0052] Step 2: Outside the patient's body, the ends of the suture 300 implanted in the anterior leaflet 401 are respectively inserted into the threading channels 220 of the adjustable suture lock buckle 20 of the suture lock knot device 100, that is, the ends of the suture 300 are respectively led out from the threading channels 220 between the fixed base 22 and the lock core 24, and the suture lock knot device 100 is introduced into the patient's body through the apex of the heart, and the control handle 54 of the pushing mechanism 50 of the suture lock knot device 100 is operated to drive the conveying member 52 to drive the distal end surface of the fixed base 22 to be placed on the outer surface of the apex of the heart, so as to maintain the relative position between the adjustable suture lock buckle 20 and the heart;

[0053] Step 3: Pull the suture 300 toward the proximal end. A group of sutures 300 may be pulled at the same time, or a single suture 300 may be pulled for fine adjustment. Meanwhile, the regurgitation of the mitral valve may be observed through medical imaging such as ultrasound.

[0054] Step 4: When the slightest reflux is observed, it indicates that the length of the suture 300 is appropriate. At this time, the lock core 24 can be inserted into the fixed portion 226 of the fixed base 22. The lock core 24 and the fixed base 22 gradually push the suture 300 until the lock core 24 cannot move forward any further.

[0055] Step 5: insert the fixing pin 26, that is, insert the fixing pin 26 into the first through hole 2266 of the fixing base 22 and the second through hole 2454 of the lock core 24 to fix the lock core 24 in the fixing base 22. At this time, the suture 300 is fixed in the lock buckle 20;

[0056] Step 6: Cut the end of the suture 300 or tie it in a surgical knotting manner, and sew the fixing base 22 to the ventricular wall. At this time, the suture 300 acts as an artificial tendon to pull the anterior leaflet 301.

[0057] When the length of the artificial chord needs to be adjusted after a period of time, the fixing pin 26 can be pulled out, and then the length of the suture 300 can be adjusted, and then the lock core 24 can be pushed again until it cannot move forward, and then the lock core 24 and the fixed base 22 can be fixed.

[0058] The adjustable suture lock buckle 20 of the present invention has a simple structure, and the lock core 24 and the fixed base 22 do not deform, thereby avoiding damage to the adjustable suture lock buckle 20 and the suture 300, thereby increasing the service life of the adjustable suture lock buckle 20 and the suture 300 and improving the safety of the device; in the process of locking the suture 300 to the bottom, the length of the suture 300 can be adjusted in real time and in multiple levels for multiple times, thereby ensuring the implantation effect of the suture 300 and improving the success rate of the operation; after locking the suture, if the suture length needs to be adjusted again, the lock core 24 and the fixed base 22 can be loosened again, and the locking part 242 of the lock core 24 and the abutment part 223 of the fixed base 22 can be released to lock the suture 300, so as to facilitate the adjustment of the length of the suture 300 again.

[0059] Please also read Figures 10 to 14 The structure of the adjustable suture lock buckle 20a provided in the second embodiment of the present invention is similar to that of the first embodiment, except that: in the second embodiment, no fixing pin is required, and the lock core 24a and the fixed base 22a are fixed by the clamping connection between the protrusion and the positioning groove. Specifically, a positioning groove 2267 is circumferentially provided at the distal end of the guide groove 2264, and the limit member 2452 is rotated circumferentially at the distal end of the guide groove 2264 until it is clamped into the positioning groove 2267, so that the lock core 24a and the fixed base 22a can be detachably fixed relative to each other.

[0060] Specifically, a stopper 2452 is convexly provided on the outer circumference of the lock core 24a. In this embodiment, two stoppers 2452 are symmetrically convexly provided on the outer circumference of the lock core 24a. The proximal surface of the lock core 24a has a square groove 2455, which cooperates with the pushing mechanism 50 to rotate the lock core 24a clockwise or counterclockwise. The guide groove 2264 on the inner wall of the fixed portion 226 of the fixed base 22 is adapted to the stopper 2452 of the lock core 24a, and the distal end of each guide groove 2264 extends circumferentially on the inner wall of the fixed portion 226 to form a recessed positioning groove 2267, which is adapted to the shape of the stopper 2452 and is used to fix the lock core 24a. In this embodiment, the lock core 24a is fixed in the following manner: by pushing the limit piece 2452 of the lock core 24a along the guide groove 2264 toward the far end of the fixed base 22, the relative gap between the lock thread portion 242 and the abutment portion 223 is reduced accordingly. When the lock core 24a, the suture 300 and the fixed base 22a can no longer move, the lock core 24a is rotated in the first direction so that the limit piece 2452 is inserted into the corresponding positioning groove 2267 until the lock core 24a can no longer move. At this time, the suture 300 is locked between the lock thread portion 242 and the abutment portion 223.

[0061] After a period of time after the artificial tendon chord is implanted, if the length of the artificial tendon chord needs to be adjusted, the push mechanism 50 cooperates with the square slot 2455 to rotate the lock core 24a in the second direction, which is opposite to the first direction, so that the limiter 2452 withdraws from the engagement with the positioning slot 2267, and then the length of the suture 300 is adjusted, and then the lock core 24a is rotated in the first direction again to engage the limiter 2452 in the corresponding positioning slot 2267 again, so as to fix the lock core 24a and the fixed base 22a, and re-lock the suture 300. The adjustable suture locker 20a in this embodiment has a simple structure, is safe to use, and is conducive to quickly locking the suture 300.

[0062] Please also read Figures 15 to 18The structure of the suture locking device 100b provided in the third embodiment of the present invention is similar to that of the first embodiment, except that: in the third embodiment, the structure of the adjustable suture lock buckle 20b is different from that of the adjustable suture lock buckle 20 of the first embodiment, that is, the lock core 24b is screwed into the locking channel 222 of the fixed base 22a and can rotate relative to the fixed base 22a; specifically, the outer surface of the lock core 24b is provided with an external thread 2456, and the inner wall of the locking channel 222 of the fixed base 22b is provided with an internal thread 2267, and the lock core 24b is threadedly connected with the fixed base 22b to form an interlocking, which has the effect of preventing loosening.

[0063] like Fig.15 As shown, the conveying member 52 of the pushing mechanism 50 includes a mandrel 55 and a push rod 56 movably sleeved outside the mandrel 55, and a handle 54 is connected to the proximal ends of the mandrel 55 and the push rod 56. The adjustable suture locker 20b is accommodated in the distal end of the push rod 56 and is detachably connected to the distal end of the mandrel 55, that is, the distal end of the mandrel 55 is detachably inserted into the square groove 2455. The handle 54 can drive the relative movement between the push rod 56 and the mandrel 55. When the mandrel 55 rotates clockwise, the lock core 24b moves toward the distal end relative to the fixed base 22b. When the lock core 24b cannot move further, it indicates that the adjustable suture lock buckle 20b has locked the suture 300. At this time, the push rod 56 and the mandrel 55 can be withdrawn, and the connection between the mandrel 55 and the lock core 24b can be released, so that the adjustable suture lock buckle 20b is separated from the pushing mechanism 50, and the adjustable suture lock buckle 20b is implanted in the patient's body and fixes the suture 300. When the length of the artificial tendon cord needs to be adjusted, the pushing mechanism 50 can be sent into the patient's body and docked with the proximal end of the lock core 24b, and then the mandrel 55 is rotated counterclockwise to open the lock core 24b. At this time, the suture 300 is in a loose state. After adjusting the length of the suture 300 to an appropriate length again, the lock core 24b is rotated again to fix the suture 300, and then separated from the pushing mechanism 50 to complete the secondary adjustment of the tendon cord length.

[0064] It can be understood that the above description only uses the adjustable suture lock and lock push mechanism for the mitral valve repair process as an example to illustrate the use of the present invention. The adjustable suture lock and lock push mechanism of the present invention can also be used to lock and fix sutures in other surgical procedures.

[0065] The above is an implementation of the embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the embodiment of the present invention. These improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. An adjustable suture lock buckle, characterized in that: It comprises a fixed base and a lock core detachably connected to the fixed base, the fixed base is provided with a threading channel for threading sutures, the lock core and the fixed base are relatively fixed or movable to lock or release the sutures threaded in the threading channel; The suture is used as an artificial tendon, one end of which is implanted in the valve leaflet and the other end passes through the threading channel; the distal end of the fixed base is provided with an anchoring portion extending radially, and the anchoring portion includes a fitting surface; the fitting surface is provided with at least one through hole, and the through hole can be used to fix the adjustable suture lock buckle on the outer surface of the apex; The bonding surface is provided with active drugs to promote the crawling and growth of endothelial cells on the bonding surface; The fixed base is provided with a locking channel along the axial direction, the threading channel passes through the locking channel, the fixed base forms an abutment portion at the intersection of the locking channel and the threading channel, the suture covers the abutment portion, and the lock core is inserted into the locking channel until the lock core abuts against the abutment portion to lock the suture; The lock core includes a locking portion at a distal end and a connecting portion disposed at a proximal end of the locking portion, the locking channel of the fixed base includes a locking cavity at a distal end and a connecting cavity at a proximal end, the threading channel communicates with the locking cavity, the connecting portion of the lock core is detachably inserted into the connecting cavity of the fixed base, the locking portion of the lock core is accommodated in the locking cavity of the fixed base and abuts against the abutting portion to lock the suture; The cross section of the locking cavity along the axis is conical, and the radial dimension of the locking cavity gradually decreases from the proximal end to the distal end; the cross section of the locking wire portion along the axis is conical, and the radial dimension of the locking wire portion gradually decreases from the proximal end to the distal end; The taper of the locking wire portion is greater than the taper of the locking cavity; The hardness of the fixed base is greater than the hardness of the lock core.

2. The adjustable seam lock according to claim 1, characterized in that: The threading channel is radially arranged on the fixed base, and the threading channel is connected to the locking channel and passes through the outer surface of the fixed base.

3. The adjustable seam locker according to claim 1, characterized in that: The taper angle of the locking wire portion ranges from 30 degrees to 40 degrees.

4. The adjustable seam locker according to claim 1, characterized in that: A surface of the abutment portion and / or an outer surface of the wire locking portion is provided with a clamping reinforcement piece.

5. The adjustable seam locker according to claim 1, characterized in that: The adjustable suture lock buckle also includes a fixing pin, which is detachably inserted into the fixing base in the radial direction to fix the lock core in the fixing base.

6. The adjustable seam locker according to claim 5, characterized in that: The fixing base is provided with a first through hole penetrating the connecting cavity in the radial direction, the lock core is provided with a second through hole in the radial direction, and the fixing pin is detachably installed in the first through hole and the second through hole.

7. The adjustable seam locker according to claim 1, characterized in that: At least one guide groove is concavely provided on the inner wall of the fixed base along the axial direction, and at least one limiting member is convexly provided on the outer peripheral surface of the lock core, and the limiting member is slidably received in the guide groove.

8. The adjustable seam locker according to claim 7, characterized in that: A positioning groove is provided at the distal end of the guide groove along the circumferential direction, and the limiting member is rotated at the distal end of the guide groove until it is inserted into the positioning groove.

9. The adjustable seam locker according to claim 1, characterized in that: The lock core is threaded in the fixed base and can rotate relative to the fixed base.

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