CN114305551A - Medical hasp and medical locking device - Google Patents

Abstract

The invention provides a medical lock catch and a medical locking device. The medical lock catch comprises a lock catch main body, a wire locking piece, a push rod and a position locking structure. The wire locking piece is movably arranged in the lock catch main body; the distal end of the push rod abuts the wire locking member. The push rod drives the wire locking piece to move in the lock catch main body so that the medical wire is clamped between the lock catch main body and the wire locking piece, the position locking structure can keep abutting against or drawing the push rod, the far end of the push rod abuts against the wire locking piece, therefore, the relative position of the wire locking piece and the lock catch main body can be prevented from changing, a gap between the wire locking piece and the lock catch main body for clamping the medical wire is kept, the medical wire is effectively prevented from loosening from the position between the wire locking piece and the lock catch main body, and therefore firm locking of the medical wire is achieved.

Description

Medical hasp and medical locking device

Technical Field

The invention relates to the technical field of medical instruments, in particular to a medical lock catch and a medical locking device with the medical lock catch.

Background

The operation steps of knotting and fixing medical wires (such as suture lines, repair wires used as artificial chordae tendineae, repair wires for performing edge-to-edge repair on valves and the like) are often required in the operation, and the traditional surgical operation is operated under the condition of open-cut direct vision, and is usually knotted manually by a doctor. However, with the advance of technology, various minimally invasive and interventional procedures, such as laparoscopic procedures, transcatheter interventional procedures, etc., are becoming more common, which require a small operating window to be cut in the patient's body, whereby an instrument, such as an endoscope or interventional catheter, is inserted into the patient's body to a predetermined site for treatment. In such a surgery, if knotting or fixing operation of the medical thread in the patient is required, an operator is usually required to perform remote operation outside the patient through a small operation window to knot the medical thread in the patient.

The prior art discloses a medical lock catch, wherein a hollow inner cavity is arranged in a lock catch main body, and a locking pin moves along the axial direction of the inner cavity, so that a gap between the locking pin and the inner surface of the inner cavity is gradually reduced to fix a suture thread penetrating through the inner cavity. However, since the suture thread is formed by gradually reducing the gap between the locking pin and the inner surface of the inner cavity and pressing the suture thread to complete locking between the locking pin and the inner surface of the inner cavity, the suture thread is continuously pulled during and after the operation, so that the locking pin and the locking buckle body are easily moved relatively, the gap between the locking pin and the inner surface of the inner cavity is increased, the locking force on the suture thread is reduced, and even the suture thread is loosened from the locking buckle and falls off from the locking buckle, thereby causing a certain risk to the human body.

Disclosure of Invention

The invention aims to solve the technical problem of providing a medical lock catch and a medical locking device with the medical lock catch aiming at the defects of the prior art.

In order to solve the technical problem, the invention firstly provides a medical lock catch for locking a medical wire, which comprises a lock catch main body, a wire locking piece, a push rod and a position locking structure; the wire locking piece is movably arranged in the lock catch main body, and the far end of the push rod is abutted against the wire locking piece so as to drive the wire locking piece to move in the lock catch main body, so that the medical wire is clamped between the lock catch main body and the wire locking piece; under the state that the medical wire is clamped, the position locking structure pushes or pulls the push rod so as to keep the relative position of the wire locking piece and the lock catch main body.

The invention also provides a medical locking device, which at least comprises the medical lock catch and an operation and control assembly, wherein the operation and control assembly is detachably connected with the near end of the push rod and is used for controlling the action of the push rod, and the operation and control assembly is separated from the near end of the push rod after the relative position of the push rod and the lock catch main body is kept unchanged.

According to the medical lock catch and the medical locking device with the medical lock catch, due to the arrangement of the position locking structure, after the push rod drives the wire locking piece to move in the lock catch main body so that the medical wire is clamped between the lock catch main body and the wire locking piece, the position locking structure can keep abutting against or pulling the push rod, the far end of the push rod abuts against the wire locking piece, therefore, the relative position of the wire locking piece and the lock catch main body can be prevented from changing, a gap between the wire locking piece and the lock catch main body for clamping the medical wire is kept, the medical wire is effectively prevented from loosening from the space between the wire locking piece and the lock catch main body, and the medical wire is firmly locked.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is a schematic structural view of a first embodiment of the medical knotting device of the present invention.

Fig. 2 is a schematic perspective view of a first embodiment of the locking buckle of fig. 1.

Fig. 3 is a perspective exploded view of the medical fastener of fig. 2.

Fig. 4 is a perspective view of the latch body of fig. 3.

Fig. 5 is a cross-sectional view of the latch body and stop of fig. 3.

Fig. 6 is a schematic view of the end structure of the medical lock of fig. 2 with the stopper omitted.

Fig. 7 is a side view of the medical lock of fig. 2 in an initial state.

Fig. 8 is a side view of the locked state of the medical fastener of fig. 2.

Fig. 9 is a sectional view of the medical fastener of fig. 2 in an initial state.

Fig. 10 is a sectional view showing a locked state of the medical fastener of fig. 2.

Fig. 11 is a perspective view of a handle housing of the medical knotting device of fig. 1.

Fig. 12 is a perspective view of the handle shell of fig. 11 with the upper shell removed.

Fig. 13 is a cross-sectional view taken along line XIII-XIII in fig. 1.

Fig. 14 is a cross-sectional view of the steering assembly of fig. 12.

Fig. 15 is a perspective view of the stop assembly of fig. 12.

Fig. 16 is a perspective view of the medical fastener of fig. 13 and a portion of the first core and a portion of the second core.

Fig. 17-26 are schematic views illustrating a procedure of using the medical locking device according to the first embodiment of the present invention, wherein fig. 17 is a schematic view illustrating a suture sewn on the tricuspid valve; FIG. 19 is an enlarged, cross-sectional view of the distal portion of the keying device of FIG. 18; fig. 20 illustrates the medical stapling device approaching the tricuspid valve along a suture; FIG. 22 is an enlarged cross-sectional view of the distal portion of the keying device of FIG. 21; FIG. 24 is an enlarged, cross-sectional view of the distal portion of the keying device of FIG. 23; fig. 26 is an enlarged schematic view at XXVI in fig. 25.

Fig. 27 is a perspective view of a second embodiment of the medical fastener of the present invention.

Fig. 28 is an exploded perspective view of the medical fastener of fig. 27.

Fig. 29 is a side view of the medical fastener of fig. 27 in an initial state.

Fig. 30 is a side view of the locked state of the medical fastener of fig. 27.

Fig. 31 is a sectional view of the medical fastener of fig. 27 in an initial state.

Fig. 32 is a sectional view showing a locked state of the medical fastener of fig. 27.

Fig. 33-38 are schematic views illustrating a process of using the medical locking device according to the second embodiment of the present invention; wherein fig. 34, fig. 36, fig. 38 illustrate the state of the distal end of the medical locking device, and fig. 33, fig. 35, fig. 37 illustrate the operation state on the handle case corresponding to fig. 34, fig. 36, fig. 38, respectively.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without any inventive step, are within the scope of the present invention.

Furthermore, the following description of the various embodiments refers to the accompanying drawings, which illustrate specific embodiments in which the invention may be practiced. Directional phrases used in this disclosure, such as, for example, "upper," "lower," "front," "rear," "left," "right," "inner," "outer," "side," and the like, refer only to the orientation of the appended drawings and are, therefore, used herein for better and clearer illustration and understanding of the invention, and do not indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.

Orientation definition: for clarity of description, the end of the surgical procedure that is closer to the operator will be referred to hereinafter as the "proximal end" and the end that is further from the operator will be referred to hereinafter as the "distal end"; the axial direction is parallel to the direction of the connection line of the center of the far end and the center of the near end of the medical instrument; the foregoing definitions are for convenience only and are not to be construed as limiting the present invention.

Referring to fig. 1 to 3 and 7 to 10, amedical locking device 100 according to a first embodiment of the present invention includes amedical lock 20, ahandle housing 40, acontrol assembly 50, asupport tube assembly 70, and a position-limitingassembly 80. Themedical lock 20 is used for locking the medical thread 300 (themedical thread 300 may be a suture thread used for suturing an incision or a laceration, or a suture thread used for performing edge-to-edge repair on a heart valve, a repair thread used as an artificial chordae tendineae, or a suture thread implanted in internal tissues of a human body such as an annulus, etc., the material of themedical thread 300 includes but is not limited to PTFE, e-PTFE, PET, UHMWPE, etc.), themedical lock 20 includes a lockmain body 21, athread locking piece 23, apush rod 25 and aposition locking structure 27, thethread locking piece 23 is movably arranged in the lockmain body 21, the distal end of thepush rod 25 abuts against thethread locking piece 23, and thecontrol assembly 50 controls thepush rod 25 to act to drive thethread locking piece 23 to move in the lockmain body 21, so that themedical thread 300 is clamped between the lockmain body 21 and thethread locking piece 23; theposition locking structure 27 is engaged with thepush rod 25, and in a state that themedical wire 300 is clamped by the latchmain body 21 and thewire locking member 23, theposition locking structure 27 abuts against thepush rod 25 to keep the relative position of thewire locking member 23 and the latchmain body 21 unchanged. The distal end of the manipulatingmember 50 is detachably connected to the proximal end of thepush rod 25, the proximal end extends out of thehandle housing 40, and the manipulatingmember 50 is separated from thepush rod 25 after the relative position of thelocking wire member 23 and the lockingmain body 21 is maintained. Thesupport tube assembly 70 extends distally from thehandle housing 40 for receiving themedical fastener 20, thesteering assembly 50 and thestop assembly 80. The distal end of thelimiting component 80 is detachably connected to thelatch body 21, and the proximal end extends out of thehandle housing 40 for cooperating with a limiting structure provided on thelatch body 21 to prevent thelatch body 21 from moving during the process that thepush rod 25 drives thewire locking member 23 to move in thelatch body 21.

According to themedical lock 20 and themedical locking device 100, due to the arrangement of theposition locking structure 27, after thepush rod 25 drives thewire locking piece 23 to move in the lockmain body 21 so that themedical wire 300 is clamped between the lockmain body 21 and thewire locking piece 23, theposition locking structure 27 can keep abutting against thepush rod 25, the far end of thepush rod 25 abuts against thewire locking piece 23, even if themedical wire 300 is pulled, the relative position of thewire locking piece 23 and the lockmain body 21 can be prevented from changing, the lockmain body 21 and thewire locking piece 23 cannot loosen, a gap between thewire locking piece 23 and the lockmain body 21 for clamping themedical wire 300 is kept, themedical wire 300 is effectively prevented from being loosened from thelock wire piece 23 and the lockmain body 21, and therefore themedical wire 300 is firmly locked.

Specifically, referring to fig. 2 to 4, thelock catch body 21 is provided with anaccommodating space 210 and athreading groove 211 communicating with theaccommodating space 210, thethreading member 23 includes apressing roller 230 movably accommodated in theaccommodating space 210, and themedical thread 300 is threaded between thethreading groove 211 and thepressing roller 230; during the movement of thepush rod 25 from the proximal end of the lockingmain body 21 to the distal end of the lockingmain body 21, thedriving pressure roller 230 moves in theaccommodating space 210 to change the position relative to the lockingmain body 21, so that the gap between the outer circumferential surface of thepressure roller 230 and the bottom surface of thethreading groove 211 is gradually reduced until themedical thread 300 threaded in the gap is clamped.

Thelatch body 21 includes adistal end surface 212, aproximal end wall 213, and two oppositefirst side walls 214 and two oppositesecond side walls 215 located between thedistal end surface 212 and theproximal end wall 213, wherein outer surfaces of the twofirst side walls 214 are parallel and opposite planes, and outer surfaces of the twosecond side walls 215 are opposite arc surfaces. Theaccommodating space 210 is defined by twofirst sidewalls 214, twosecond sidewalls 215 and aproximal end wall 213, and a distal end of theaccommodating space 210 penetrates through adistal end surface 212 of thelatch body 21. Thethreading groove 211 is communicated with theaccommodating space 210, specifically, thethreading groove 211 is recessed downward from an inner surface of one of the second sidewalls 215 (shown in fig. 4), andsupport platforms 2150 are respectively disposed at two opposite sides of thethreading groove 211 in thelatch body 21. Thethreading groove 211 extends along the axial direction, one end of thethreading groove 211 penetrates through thedistal end surface 212 of the lock catchmain body 21, the other end of thethreading groove 211 penetrates through thenotch 216 arranged at the near end of the lock catchmain body 21, and themedical thread 300 extends out of thenotch 216 after passing through thethreading groove 211.

In this embodiment, the lockmain body 21 is provided with twoguide grooves 2140 aligned with each other corresponding to the twofirst sidewalls 214, and theguide grooves 2140 extend from a side of the proximal end of theaccommodating space 210 away from thenotch 216 to the distal end of theaccommodating space 210 and gradually approach to the bottom surfaces of thesupport platform 2150 and thethreading groove 211. Thewire locking member 23 further includes aroller 232 connected to thepressing roller 230, and theroller 232 is fitted into theguide groove 2140. Further, theguide channel 2140 intersects the distal end of thesupport platform 2150 and extends distally along thesupport platform 2150 and through thedistal face 212 of thelatch body 21. The contour of theguide groove 2140 is preferably curved toward the side where thethreading groove 211 is located. The shape of thepressing roller 230 is generally cylindrical, thepressing roller 230 is fixedly sleeved in the middle of theroller 232, thepressing roller 230 and theroller 232 have a coaxial axis, that is, two opposite ends of theroller 232 extend out of two opposite end faces of thepressing roller 230 along the axial direction of thepressing roller 230. The opposite ends of theroller 232 are respectively connected with a blockingpiece 234, and the radial dimension of theblocking piece 234 along theroller 232 is larger than the width of the guidinggroove 2140, so as to prevent thewire locking member 23 from greatly swaying in theaccommodating space 210 of the lockingmain body 21.

In some other embodiments, since the diameter of thepressing roller 230 is larger than the width of the guidinggroove 2140, the blockingpieces 234 at the opposite ends of theroller 232 can be omitted.

In some other embodiments, the side wall of thelocking body 21 corresponding to theaccommodating space 210 may be provided with a guide rail (not shown) instead of theguide groove 2140, the guide rail extends from the proximal end of theaccommodating space 210 to the distal end of theaccommodating space 210 and gradually approaches the bottom surface of thethreading groove 211, and theroller 23 is adapted to the guide rail. Further, two opposite guide rails are disposed on the twofirst sidewalls 214 of thelocking device body 21, and each guide rail extends from a side of the proximal end of theaccommodating space 210 away from thenotch 216 to the distal end of theaccommodating space 210 and gradually approaches thethreading slot 211. The two opposite ends of theroller 232 can be respectively arranged on the two guide rails in a rolling manner, theroller 232 rolls along the guide rails to drive thecompression roller 230 to roll, and thecompression roller 230 is gradually close to the bottom surface of the threadinggroove 211, so that themedical thread 300 passing through the threadinggroove 211 is clamped between thecompression roller 230 and the bottom surface of the threadinggroove 211.

Referring to fig. 5 and 6 together, the diameter value of thepressing roller 230, the diameter value of themedical thread 300, the height value of the distal end of theguide groove 2140, and the maximum height value of the bottom surface of thethread passing groove 211 from the distal end of theguide groove 2140 satisfy: h is not less than 0₁-H₂/2-D₁/2≤D₂Wherein H is₁Represents the maximum height value, H, of the bottom surface of the threadinggroove 211 from the distal end of theguide groove 2140₂Indicates a height value, D, of the distal end of theguide groove 2140₁Representing the diameter value of the press roll, D₂Representing a diameter value of the medical wire. In particular, the amount of the solvent to be used,when thepressing roller 230 clamps themedical thread 300 with the bottom surface of the threadinggroove 211, a gap a between a portion of the outer circumferential surface of thepressing roller 230 closest to the bottom surface of the threadinggroove 211 and the bottom surface of the threadinggroove 211 is equal to 1/2, which is a value obtained by subtracting a height value of the distal end of theguide groove 2140 from a maximum height value of the bottom surface of the threadinggroove 211 from the distal end of theguide groove 2140, and 1/2, which is a value of the diameter of thepressing roller 230, i.e., a ═ H₁-H₂/2-D₁2; in order to firmly clamp themedical wire 300 threaded in the gap a between the outer circumferential surface of thepressing roller 230 and the bottom surface of the threadinggroove 211, the diameter of the gap a cannot be larger than the diameter of themedical wire 300. The length value W of thepress roll 230 in the axial direction thereof₁Width W less than or equal to thethreading groove 211₂So that thepressing roller 230 can be freely introduced into the threadinggroove 211. When thepush rod 25 pushes thepressing roller 230 axially and distally, theroller 232 is guided by theguide groove 2140 to approach the bottom surface of the threadinggroove 211 while rolling in theguide groove 2140, and drives thepressing roller 230 to approach the bottom surface of the threadinggroove 211 until themedical thread 300 in thethreading groove 211 is locked between the outer circumferential surface of thepressing roller 230 and the bottom surface of the threadinggroove 211.

As shown in fig. 2, fig. 3, fig. 5, fig. 9 and fig. 10, in the present embodiment, theproximal end wall 213 of the lockingmain body 21 is provided with a lockingscrew hole 2131 and a limitingscrew hole 2133 which are spaced apart from each other, the lockingscrew hole 2131 is closer to the middle position of theproximal end wall 213 than the limitingscrew hole 2133, and preferably, the lockingscrew hole 2131 is coaxial with the lockingmain body 21. The lockingscrew hole 2131 and the limitingscrew hole 2133 extend axially, and the lockingscrew hole 2131 is communicated with theaccommodating space 210. Thepush rod 25 includes arod body 251 and aradial protrusion 253 disposed at a distal end of therod body 251, the diameter of theradial protrusion 253 is larger than that of therod body 251, atransmission thread 255 is disposed on therod body 251, and thetransmission thread 255 is screwed with the lockingscrew hole 2131 of the lockingmain body 21. When thepush rod 25 is rotated, thetransmission thread 255 spirally moves in the lockingscrew hole 2131, thepush rod 25 synchronously and axially moves relative to the lock catchmain body 21, thepress roller 230 is pushed to move towards the far end, and thepress roller 230 gradually approaches to the bottom surface of the threadinggroove 211 until themedical thread 300 between thepress roller 230 and the threadinggroove 211 is pressed by the two; after that, the rotation of thepush rod 25 is stopped, the far end of thepush rod 25 is pressed against thepress roller 230 to receive the axial acting force of thepress roller 230 on the push rod, so that thetransmission thread 255 on thepush rod 25 and the thread on the lockingscrew hole 2131 are mutually extruded to realize self-locking, the relative position of thepress roller 230 and the threadinggroove 211 can be kept, even if themedical thread 300 is pulled, the position of thepress roller 230 cannot be changed, the gap between thepress roller 230 and the threadinggroove 211 for clamping themedical thread 300 is kept, themedical thread 300 is prevented from being loosened, and themedical thread 300 is kept firmly locked. That is, in the present embodiment, theposition locking structure 27 includes a lockingscrew hole 2131 of the lockmain body 21 and a drivingscrew 255 of thepush rod 25.

Theposition locking structure 27 further includes astopper 29 to define a distal limit position of thewire locking member 23, stopping thewire locking member 23 from being disengaged from thelocker body 21. As shown in fig. 2 and 3, thestopper 29 includes a blockingplate 291 and two catchingblocks 293 protruding from two opposite sides of a proximal end surface of the blockingplate 291, the proximal end surface of the blockingplate 291 abuts against thedistal end surface 212 of the lockmain body 21, the two catchingblocks 293 are respectively caught in distal openings of twoguide grooves 2140 of the lockmain body 21, the catchingblocks 293 are used for stopping theroller 232 from continuously rolling distally in theguide grooves 2140, and the blockingplate 291 is used for limiting a distal limit position of thepressing roller 230. Furthermore, athreading hole 295 is formed in thebaffle 291, thethreading hole 295 is communicated with the threadinggroove 211 of the lock catchmain body 21, and themedical thread 300 is threaded in thethreading groove 211 through thethreading hole 295.

Further, as shown in fig. 3, afirst connector 28 is further connected to the proximal end of thepush rod 25, and thefirst connector 28 is exposed outside thelatch body 21 after thepush rod 25 is mounted to thelatch body 21. Specifically, the proximal end face of thepush rod 25 is provided with a fixinghole 256 for fixedly connecting the first joint 28. The first joint 28 includes a connectingportion 281 and a fixingpost 283 disposed at a distal end of the connectingportion 281, and the fixingpost 283 and the fixinghole 256 may be fixedly connected by screwing, welding, or the like. The connectingportion 281 is detachably connected to a distal end of thefirst core 51 in the manipulatingassembly 50 described later. In other embodiments, thefirst connector 28 and thepush rod 25 may be integrally formed.

The limitingscrew hole 2133 on the lock catchmain body 21 and the twofirst side walls 214 form a limiting structure, wherein the limitingscrew hole 2133 is in threaded connection with a limitingscrew 83 at the distal end of a limitingassembly 80, which will be described later, so as to prevent the lock catchmain body 21 from moving axially in the process that thepush rod 25 drives thewire locking piece 23 to move in the lock catchmain body 21; the flat surfaces of the twofirst side walls 214 are engaged with corresponding flat surfaces in the inner cavity of thesleeve 71 of thesupport tube assembly 70, which will be described later, to prevent thelatch body 21 from rotating during the movement of thewire locking member 23 in thelatch body 21 driven by thepush rod 25.

Referring to fig. 7 to 10, when themedical lock buckle 20 is used, a group ofmedical wires 300 is threaded between the outer circumferential surface of thepressing roller 230 and the bottom surface of the threadinggroove 211, the first joint 28 is driven to rotate, so that thepush rod 25 moves axially and distally relative to the rotation edge of the lockingscrew hole 2131, theradial protrusion 253 of thepush rod 25 pushes thepressing roller 230 to drive thethreading locking piece 23 to move along theguide groove 2140 toward thebaffle 291 and the bottom surface of the threadinggroove 211, and the gap between the outer circumferential surface of thepressing roller 230 and the bottom surface of the threadinggroove 211 is gradually reduced until themedical wires 300 are clamped between the outer circumferential surface of thepressing roller 230 and the bottom surface of the threadinggroove 211; thereafter, due to the screw locking between the drivingscrew 255 of thepush rod 25 and the lockingscrew hole 2131, the relative position between the lockingmain body 21 and thewire locking member 23 can be prevented from changing, and themedical wire 300 can be prevented from being loosened from between thewire locking member 23 and the lockingmain body 21.

In this embodiment, thelocking device body 21, thewire locking member 23 and thepush rod 25 can be made of, but not limited to, a biocompatible metal material such as stainless steel, nickel titanium, pure titanium, etc.

As shown in fig. 11 and 12, thehandle case 40 includes anupper case 41 and alower case 42 which are engaged with each other, and afront screw 43 which is screw-engaged with theupper case 41 and thelower case 42. An outertube fixing member 44 is fixedly installed in the inner cavity of thelower shell 42, and the proximal end of theouter tube 75 in thesupport tube assembly 70 is fixedly connected with the outertube fixing member 44. Thehandle case 40 is provided with first andsecond shutters 46 and 47 provided at intervals, and third andfourth shutters 48 and 49 provided at intervals. Specifically, thefirst baffle 46 and thesecond baffle 47 are disposed in the middle of the proximal end of the inner cavity of thelower shell 42, and thethird baffle 48 and thefourth baffle 49 are disposed in the proximal end of the inner cavity of thelower shell 42 near the middle.

Please refer to fig. 1, and fig. 11 to 16: the lock catchmain body 21 is movably arranged at the far end of the supportingtube component 70 in a penetrating way; the distal end of thesteering assembly 50 is detachably connected to thepush rod 25, and the proximal end extends out of thehandle housing 40; the distal end of thestop assembly 80 is threadably engaged with thelatch body 21 and the proximal end extends out of thehandle shell 40.

Specifically, thesupport tube assembly 70 includes asleeve 71, a connectingcylinder 73, and anouter tube 75 connected in this order from the distal end to the proximal end. The lockingmain body 21 is movably arranged in thesleeve 71 in a penetrating manner, two opposite sides of thesleeve 71 are provided with planes attached to the outer surfaces of the two first side walls 14 of the lockingmain body 21, and the planes of the first side walls 14 are attached to the planes in thesleeve 71, so that the lockingmain body 21 is prevented from rotating in the process that thepush rod 25 drives thewire locking piece 23 to move in the lockingmain body 21. Thesleeve 71 has aninner cavity 711 extending axially through its distal and proximal faces, thelatch body 21 being disposed in theinner cavity 711 of thesleeve 71 and being only axially slidable in theinner cavity 711. Athread outlet notch 713 is formed in the proximal end of the outer peripheral wall of thesleeve 71 corresponding to thethreading groove 211, and themedical thread 300 in thethreading groove 211 extends out of the supportingtube assembly 70 from thethread outlet notch 713. The distal end surface of the connectingcylinder 73 is fixedly attached to the proximal end surface of thesleeve 71, the connectingcylinder 73 is provided with a first throughgroove 731 and a second throughgroove 733 at intervals along the axial direction, the first throughgroove 731 is located in the middle of the connectingcylinder 73 and aligned with thepush rod 25, and the second throughgroove 733 is aligned with thelimit screw hole 2133 of thelock catch body 21. The proximal end of theconnector barrel 73 is fixedly attached to the distal end of theouter tube 75. In this embodiment, theouter tube 75 is a flexible tube that has a supporting effect and can be bent to facilitate insertion into a lumen of a human body.

The steeringassembly 50 includes a firstinner core 51 and a connectingrod 52 connected to a distal end of the firstinner core 51. Specifically, the firstinner core 51 is movably inserted into theouter tube 75, and in order to meet the requirement of human intervention, in this embodiment, the firstinner core 51 is flexible and bendable; the distal end of the connectingrod 52 is provided with a second joint 521, the second joint 521 is detachably connected with the first joint 28 of thepush rod 25, and further, the first joint 28 and the second joint 521 are respectively provided with a concave-convex structure with a complementary shape, such as a Z shape, an S shape, a tooth shape or a wave shape. When the first joint 28 is connected with the second joint 521 and is inserted into the first throughgroove 731 of the connectingcylinder 73, the connection relationship between the two is maintained; when the first joint 28 and the second joint 521 lose the envelope of the first throughgroove 731 on the periphery, such as when the distal end of thesleeve 71 is exposed, the second joint 521 and the first joint 28 can be disengaged to release the connection therebetween.

As shown in fig. 14, the operatingassembly 50 further includes afirst operating button 54 exposed from the proximal end of thehandle housing 40 and afirst barrel 55 detachably connected to thefirst operating button 54, wherein thefirst operating button 54 is disposed at the proximal end of thefirst barrel 55. The proximal end of the firstinner core 51 is movably inserted through theouter tube 75 and the outertube fixing member 44 and then fixedly connected to thefirst manipulation knob 54. When thefirst barrel part 55 is locked with thefirst operating button 54, thefirst barrel part 55 can rotate with thefirst operating button 54 and move axially together with thefirst operating button 54; when thefirst barrel member 55 is unlocked from thefirst operating button 54, thefirst operating member 55 is axially movable relative to thefirst barrel member 55. Specifically, thefirst operation button 54 includes ahollow housing 541, aconnection column 543 axially extending inside thehousing 541, and anend cap 545 disposed at a proximal end of thehousing 541 and fixedly connected to theconnection column 543. An annularslide guide groove 546 is disposed between the connectingcolumn 543 and thehousing 541, and the proximal end of thefirst barrel 55 is slidably inserted into theslide guide groove 546 along the axial direction. The distal end of thefirst barrel 55 is provided with aguide rod 551 in an axially protruding manner, the middle of the proximal end surface of thefirst barrel 55 is provided with aslide guiding hole 553 in an axially protruding manner, and the connectingcolumn 543 is slidably inserted into theslide guiding hole 553. The proximal end of the firstinner core 51 extends axially through thefirst barrel member 55 and is fixedly attached to theend cap 545.Guide rod 551 is movably embedded in the notches respectively arranged onfirst baffle 46 andsecond baffle 47, first retainingring 555 protruding along the circumferential direction is arranged onguide rod 551,first retaining ring 555 is positioned betweenfirst baffle 46 andsecond baffle 47, so thatfirst barrel part 55 can rotate relative tofirst baffle 46 andsecond baffle 47 and can axially move betweenfirst baffle 46 andsecond baffle 47, i.e. first retainingring 555 can be stopped betweenfirst baffle 46 andsecond baffle 47. Thehousing 541 has ascrew hole 547 formed along a radial direction thereof to communicate with theguide groove 546, and thefirst operating button 54 further includes afastening screw 548 screwed into thescrew hole 547, such that when thefastening screw 548 is tightened, thefirst barrel member 55 and thefirst operating button 54 are fixed together to be synchronously operated, and conversely, when thefastening screw 548 is loosened, thefirst barrel member 55 and thefirst operating button 54 are respectively operated. Preferably, thefirst barrel 55 is further provided with a displacement mark on its outer peripheral surface for displaying the amount of movement of thefirst manipulation knob 54 in the axial direction relative to thefirst barrel 55.

As shown in fig. 12, 13 and 15, the distal end of the limitingmember 80 is detachably connected to the lockingmain body 21, the limitingmember 80 is engaged with the limitingscrew hole 2133 formed on the lockingmain body 21 to prevent the lockingmain body 21 from moving axially during the process of thepush rod 25 driving thewire locking member 23 to move in the lockingmain body 21, and the limitingmember 80 is separated from the lockingmain body 21 before the manipulatingmember 50 is separated from the proximal end of thepush rod 25 so as not to hinder themedical lock 20 from being pushed out of thesleeve 71. Specifically, the limitingassembly 80 includes a secondinner core 81 and a limitingscrew 83 connected to a distal end of the secondinner core 81, and the secondinner core 81 is movably inserted into theouter tube 75. In order to adapt to the requirement of human body intervention, in this embodiment, the secondinner core 81 is flexible and bendable. Thelimit screw 83 is movably inserted into the second throughgroove 733 of the connectingcylinder 73, and thelimit screw 83 can be screwed with thelimit screw 2133 of the lockingmain body 21. When thelimit screw 83 is screwed in thelimit screw hole 2133, thelimit screw 83 can prevent the lock catchmain body 21 from moving in the axial direction; after thelimit screw 83 is released from thelimit screw hole 2133, thelatch body 21 can be moved in the axial direction by thepush rod 25.

Thestop assembly 80 further includes asecond knob 84 exposed out of the proximal end of thehandle housing 40 and asecond barrel 85 fixedly connected to thesecond knob 84, thesecond knob 84 being located at the proximal end of thesecond barrel 85. The proximal end of the secondinner core 81 is movably inserted through theouter tube 75 and the outertube fixing member 44 and then fixedly connected to thesecond barrel 85 or thesecond operating button 84. Thesecond cylinder 85 is movably inserted into the notches of thethird baffle 48 and thefourth baffle 49, thesecond cylinder 85 is provided with asecond retaining ring 86 protruding along the circumferential direction, and thesecond retaining ring 86 is located between thethird baffle 48 and thefourth baffle 49.Second cartridge 85 is rotatable relative tothird baffle 48 andfourth baffle 49 and is axially movable betweenthird baffle 48 andfourth baffle 49, i.e.,second stop 86 can be stopped betweenthird baffle 48 andfourth baffle 49.

Referring to fig. 17 to 26, a procedure of using themedical locking device 100 according to the first embodiment of the present invention is described below by taking a valve repair of a tricuspid valve of a heart as an example.

The tricuspid valve is a one-way "valve" between the Right Atrium (RA) and the Right Ventricle (RV), which ensures blood flow from the right atrium to the right ventricle. A normal healthy tricuspid valve has a plurality of chordae tendineae. The valve leaves of the tricuspid valve are divided into an anterior leaf, a posterior leaf and a septal lobe, when the right ventricle is in a diastole state, the three are in an open state, and blood flows from the right atrium to the right ventricle; when the right ventricle is in a contraction state, the chordae tendineae are stretched to ensure that the valve leaflets are not flushed to the atrium side by blood flow, and the valve leaflets close well, so that blood is ensured to flow from the right ventricle to the pulmonary artery through the Pulmonary Valve (PV). If the tricuspid valve is diseased, when the right ventricle is in a contracted state, each valve leaflet is not closed completely, and the impulse of blood flow further causes the valve leaflets to fall into the right atrium, so that the blood flows back.

As shown in fig. 17, before using themedical locking device 100, a plurality of medical wires (which may be referred to as sutures) 300 withelastic spacers 310 are implanted into the anterior leaflet, the posterior leaflet, and the septal leaflet of the tricuspid valve, respectively, so that the point contact between thesutures 300 and the leaflets is converted into the surface contact between theelastic spacers 310 and the leaflets, which can effectively reduce the risk of tearing of the leaflets; the free end of thesuture 300 extends out of the body.

The first step is as follows: as shown in fig. 18 and 19, a plurality ofsutures 300 are threaded through the threadingslots 211 from the threading holes 295 and out of the threadingnotches 713 outside the patient's body. At this time, thepressing roller 230 is close to the proximal end of thelocker body 21; the first joint 28 and the second joint 521 are inserted into the first throughgroove 731 of the connectingcylinder 73; thelimit screw 83 is in threaded connection with thelimit screw hole 2133; thefastening screw 548 is tightened, and thefirst barrel member 55 is fixed to thefirst operating knob 54; thefirst retainer ring 555 is attached to thefirst baffle 46; thesecond retainer 86 is attached to thethird baffle 48.

The second step is that: as shown in fig. 20, and with reference to fig. 21 and 22, with the guidance of the suture 300, the distal end of the support tube assembly 70 is advanced into the right atrium of the heart via an interventional pathway (e.g., femoral vein, inferior vena cava), moved closer to the leaflets of the tricuspid valve, simultaneously, the tightness of the suture 300 on each valve leaflet is adjusted, simultaneously the state of the tricuspid valve with the lightest regurgitation is determined by the ultrasound, when the state is reached, the first operating button 54 is rotated to drive the first core 51, the connecting rod 52 and the push rod 25 to rotate, so that the radial protrusion 253 at the distal end of the push rod 25 pushes against the press roller 230, the roller 232 moves along the guide groove 2140 toward the bottom surface of the retaining plate 291 and the threading groove 211, the gap between the outer circumferential surface of the pressing roller 230 and the bottom surface of the threading groove 211 is gradually reduced until the suture 300 is clamped between the outer circumferential surface of the pressing roller 230 and the bottom surface of the threading groove 211, and self-locking is formed between the transmission thread 255 on the push rod 25 and the locking screw hole 2131 of the lock catch main body 21; at this point, the first retainer 555 of the first barrel member 55 moves axially from the first stop 46 to abut the second stop 47, indicating that the medical fastener 20 has locked the suture 300. During this step, thelimit screw 83 is screwed into thelimit screw hole 2133 to prevent thelock body 21 from moving axially and distally.

The third step: referring to fig. 21 and 22, thesecond operating button 84 is rotated to rotate thesecond core 81, and thesecond core 81 drives thelimit screw 83 to rotate relative to thelatch body 21 until thelimit screw 83 is disengaged from thelimit screw hole 2133. At this time, thesecond shutter 86 moves from thethird shutter 48 to abut against thefourth shutter 49.

The fourth step: as shown in fig. 23 and 24, thefastening screw 548 is unscrewed to release the relative locking between thefirst operating button 54 and thefirst barrel 55, thefirst operating button 54 is pushed to the distal end to drive the firstinner core 51 to move to the distal end along the axial direction, the firstinner core 51 pushes thepush rod 25 and the entiremedical lock 20 to expose out of thesleeve 71, the outer envelopes of the first joint 28 and the second joint 521 disappear, and the connection between the first joint 28 and the second joint 521 is released.

Thereafter, theknot device 100 is withdrawn and the cutting device is used to cut thesuture 300 out of themedical lock 20. As shown in fig. 25 and 26, the lockingdevice 20 and the lockedsuture 300 are left in the heart, and the leaflets of the tricuspid valve are pulled toward each other by the plurality ofsutures 300, completing the edge-to-edge repair.

It is understood that the above only describes the use of the medical lock and medical locking device with the edge-to-edge repair of the tricuspid valve as an example. The medical latch and the medical locking device can also be used for locking and fixing the medical thread in other operation processes such as tricuspid chordae repair (the medical thread is used as an artificial chordae, one end of the medical thread is sewed on the valve leaflet, the other end of the medical thread is arranged on an anchor which is anchored on the ventricular wall or papillary muscle in a penetrating way and is locked by the medical latch), mitral valve edge opposite edge repair, mitral chordae repair, annuloplasty (a plurality of anchors are anchored into annulus tissue, the medical thread is connected with the near end of each anchor in series, and the medical latch is used for locking after the medical thread is tightened to reduce the area of the orifice of the valve), simple incision or broken suture and the like.

Referring to fig. 27 to 32, the structure of themedical fastener 20a according to the second embodiment of the invention is similar to that of the first embodiment, but the structure of theposition locking structure 27a of themedical fastener 20a in the second embodiment is slightly different from that of theposition locking structure 27 in the first embodiment. Referring to fig. 33 to 38, the manipulatingmember 50a of the second embodiment of the medical knotting apparatus has a slightly different structure from the manipulatingmember 50 of the first embodiment.

Specifically, as shown in fig. 27 to 32, in the second embodiment, theposition locking structure 27a includes a throughhole 2135 axially penetrating through the latchmain body 21a for thepush rod 25a to move through, aradial protrusion 253 disposed on the distal end of thepush rod 25a, and a compressionelastic member 275 sleeved on thepush rod 25a, and two ends of the compressionelastic member 275 abut against theradial protrusion 253 and a portion of the latchmain body 21a located on the periphery of the throughhole 2135, respectively. Aradial projection 253 surrounds the distal end of therod 251 of thepushrod 25a, theradial projection 253 having an outer diameter greater than the diameter of therod 251. The throughhole 2135 axially penetrates through theproximal end wall 213 of thelatch body 21a and communicates with theaccommodating space 210, the diameter of the throughhole 2135 is larger than or equal to the diameter of therod 251 but smaller than the diameter of theradial protrusion 253, so that therod 251 can be movably inserted into the throughhole 2135, and theradial protrusion 253 can be stopped by the throughhole 2135 to prevent thethrust rod 25a from being disengaged from thelatch body 21a from the throughhole 2135. In this embodiment, the compressionelastic member 275 preferably compresses a spring. When the proximal end of thepush rod 25a is not pulled by external force, thecompression spring 275 automatically springs open, theradial protrusion 253 at the distal end of the self-drivenpush rod 25a pushes against thepressing roller 230 to drive thethread locking piece 23 to move towards thebaffle 291 and the bottom surface of the threadinggroove 211 along theguide groove 2140, and the gap between the outer circumferential surface of thepressing roller 230 and the bottom surface of the threadinggroove 211 is gradually reduced until themedical thread 300 is clamped between the outer circumferential surface of thepressing roller 230 and the bottom surface of the threadinggroove 211; thereafter, since theradial protrusion 253 at the distal end of thepush rod 25a is always pressed by the compression spring toward the distal end, the relative position between the lockingmain body 21a and thelocking wire 23 can be prevented from changing, and themedical wire 300 can be prevented from being released from between the lockingwire 23 and the lockingmain body 21 a.

As shown in fig. 33, 35 and 37, the distance between thefirst baffle 46 and thesecond baffle 47 at the proximal end and the distal end of thefirst retainer 555 of the manipulatingassembly 50a is smaller than the distance between thefirst baffle 46 and thesecond baffle 47 in the first embodiment. Specifically, the distance between thefirst baffle 46 and thesecond baffle 47 in the second embodiment is equal to or slightly larger than the axial thickness of thefirst retaining ring 555, and thefirst baffle 46 and thesecond baffle 47 are used for axially positioning thefirst retaining ring 555 to prevent thefirst barrel member 55 from being carried along to move axially when thecompression spring 275 is sprung open. The firstcylindrical member 55 is provided with displacement marks 557 on the outer peripheral surface thereof, and the displacement marks 557 include numerals "0", "1", and "2" in the order from the proximal end to the distal end.

As shown in fig. 33 and 34, when the medical locking device of the second embodiment is in the initial state, the numbers "0", "1" and "2" on thedisplacement indicator 557 are exposed outside thefirst operating button 54. In the initial state, thefastening screw 548 is tightened, thefirst barrel member 55 and thefirst operating button 54 are fixed together, thecompression spring 275 is in a compressed state, and thewire locking member 23 is located at the proximal end of theguide groove 2140.

As shown in fig. 35 and 36, when the medical lock catch in the second embodiment is in the wire locking state, thefastening screw 548 is unscrewed, the compressionelastic member 275 automatically pops open, thefirst operating button 54 is driven to move axially and distally, the number "0" on thedisplacement mark 557 is covered by thefirst operating button 54, the numbers "1" and "2" are exposed outside thefirst operating button 54, the compressionelastic member 275 pushes thepressing roller 230 to lock themedical wire 300 from the drivingrod 25, and the compressionelastic member 275 continuously keeps elastically pushing against thepressing roller 230.

As shown in fig. 37 and 38, thefirst operating button 54 is continuously pushed to the far end until the number "1" on thedisplacement mark 557 is covered by thefirst operating button 54, and the number "2" is exposed, thefirst operating button 54 drives the firstinner core 51 to move to the far end along the axial direction, the firstinner core 51 pushes thepush rod 25a and the wholemedical lock 20a to expose out of thesleeve 71, the outer envelopes of the first joint 28 and the second joint 521 disappear, and the connection between the first joint 28 and the second joint 521 can be released.

In other embodiments, the position between thefirst operating button 54 and thefirst barrel 55 can be relatively limited or not limited by the cooperation between the positioning rod and the positioning hole; specifically, the outer peripheral surface of thefirst barrel 55 is provided with a first positioning hole along the radial direction, the outer peripheral surface of thefirst operating button 54 is provided with a second positioning hole corresponding to the first positioning hole, and when the positioning rod is inserted into the first positioning hole and the second positioning hole, the position between thefirst operating button 54 and thefirst barrel 55 is relatively limited; when the positioning rod inserted into the first positioning hole and the second positioning hole is pulled out, thefirst manipulation button 54 can move in the axial direction relative to thefirst barrel 55.

It will be appreciated that in other embodiments, a tensile resilient member such as a tension spring may be used instead of the compressionresilient member 275 of the second embodiment described above. Referring to fig. 29 to fig. 32, when the elastic member is used, the elastic member is not disposed in the receivingspace 210 of thelatch body 21a, but disposed outside the receivingspace 210, one end of the elastic member still abuts against a portion of thelatch body 21a located at the periphery of the throughhole 2135, and the other end extends to the proximal end and is connected to the proximal end of thepush rod 25a, for example, by welding. When thepush rod 25a is acted upon by an external force toward the proximal end, the tensile elastic member is stretched; when the external force applied to thepush rod 25a is removed, the stretching elastic member automatically contracts, the distal end of the self-drivenpush rod 25a pushes thepressing roller 230 to drive thethread locking member 23 to move towards thebaffle 291 and the bottom surface of thethread passing groove 211 along theguide groove 2140, and the gap between the outer circumferential surface of thepressing roller 230 and the bottom surface of thethread passing groove 211 is gradually reduced until themedical thread 300 is clamped between the outer circumferential surface of thepressing roller 230 and the bottom surface of thethread passing groove 211; thereafter, since the proximal end of thepush rod 25a is always pulled by the stretching elastic member toward the distal end, the relative position between the lockingmain body 21a and thewire locking member 23 can be prevented from changing, and themedical wire 300 can be prevented from being released from between thewire locking member 23 and the lockingmain body 21 a. That is, in this embodiment, in a state where the medical wire is clamped, the position locking structure pulls thepush rod 25a to maintain the relative position of thewire locking member 23 and thelocker body 21 a.

The foregoing is illustrative of embodiments of the present invention, and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the embodiments of the present invention and are intended to be within the scope of the present invention.

Claims (17)

1. A medical hasp for locking medical line, its characterized in that includes:

a lock catch main body;

the wire locking piece is movably arranged in the lock catch main body;

the far end of the push rod abuts against the wire locking piece so as to drive the wire locking piece to move in the lock catch main body, and the medical wire is clamped between the lock catch main body and the wire locking piece;

and the position locking structure is used for propping or pulling the push rod under the state that the medical wire is clamped, so as to keep the relative position of the wire locking piece and the lock catch main body.

2. The medical lock catch according to claim 1, wherein an accommodating space and a threading groove communicating with the accommodating space are formed in the lock catch main body, the threading member comprises a pressing roller movably accommodated in the accommodating space, and the medical thread is arranged between the threading groove and the pressing roller in a penetrating manner; and in the process that the push rod moves from the near end of the lock catch main body to the far end of the lock catch main body, the press roller is driven to move in the accommodating space, so that the gap between the press roller and the bottom surface of the threading groove is gradually reduced.

3. The medical lock catch as claimed in claim 2, wherein a guide rail or a guide groove is provided on a side wall of the lock catch body corresponding to the accommodating space, the guide rail or the guide groove extends from a proximal end of the accommodating space to a distal end of the accommodating space and gradually approaches to a bottom surface of the threading groove; the wire locking piece further comprises rolling shafts connected to two sides of the pressing roller, and the rolling shafts are matched with the guide rails or the guide grooves.

4. The medical lock of claim 3, wherein the diameter value of the compression roller, the diameter value of the medical thread, the height value of the distal end of the guide groove or the guide rail, and the maximum height value of the bottom surface of the thread passing groove from the distal end of the guide groove or the guide rail satisfy: h is not less than 0₁-H₂/2-D₁/2≤D₂Wherein H is₁Represents the maximum height value H of the bottom surface of the threading groove from the far end of the guide groove or the guide rail₂Representing a height value, D, of the distal end of the channel₁Representing the diameter value of the press roll, D₂Representing a diameter value of the medical wire.

5. The medical latch of claim 1 wherein the proximal end of the pushrod is coupled to a first connector, the first connector being exposed outside of the latch body.

6. The medical lock catch as claimed in claim 1, wherein the lock catch body is provided with a limiting structure, and the limiting structure is used for preventing the lock catch body from moving during the process that the push rod drives the wire locking member to move in the lock catch body.

7. The medical fastener of any one of claims 1-6, wherein said position locking structure comprises a threaded hole axially through said fastener body, and a driving thread provided on at least a portion of an outer surface of said push rod, said driving thread being adapted to said threaded hole.

8. The medical latch of claim 7 wherein the position locking structure further comprises a stop connected to the distal end of the latch body, the stop defining an extreme position of the distal end of the wire locking member.

9. The medical lock catch as claimed in any one of claims 1 to 6, wherein the position locking structure comprises a through hole axially penetrating through the lock catch body for the push rod to movably pass through, and an elastic member sleeved on the push rod, wherein one end of the elastic member abuts against the periphery of the through hole, and the other end abuts against the distal end of the push rod or is connected with the proximal end of the push rod.

10. The medical latch of claim 9 wherein the position locking structure further comprises a stop connected to the distal end of the latch body, the stop defining an extreme position of the distal end of the wire locking member.

11. A medical locking device, comprising the medical lock of any one of claims 1 to 10 and a manipulating member, wherein the manipulating member is detachably connected to the proximal end of the pushing rod, the manipulating member is used for controlling the action of the pushing rod, and the manipulating member is separated from the proximal end of the pushing rod after the relative position of the pushing rod and the lock body is kept unchanged.

12. The medical locking device of claim 11, further comprising a limiting component detachably connected to the locking body, wherein the limiting component cooperates with a limiting structure disposed on the locking body to prevent the locking body from moving axially during the process of the push rod driving the wire locking member to move in the locking body, and the limiting component is separated from the locking body before the manipulating component is separated from the proximal end of the push rod.

13. The medical locking device according to claim 12, further comprising a support tube assembly, wherein the locking device body is movably disposed in the distal end of the support tube assembly, and the control assembly and the limiting assembly are movably disposed in the support tube assembly and extend out of the proximal end of the support tube assembly.

14. The medical knot device of claim 13, wherein the support tube assembly comprises a sleeve, a connecting cylinder and an outer tube connected in sequence from a distal end to a proximal end; the lock catch main body is movably arranged in the sleeve in a penetrating mode, and the sleeve is matched with a limiting structure arranged on the lock catch main body so as to prevent the lock catch main body from rotating in the process that the push rod drives the wire locking piece to move in the lock catch main body; a lumen is disposed within the connector barrel surrounding a distal end of the steering assembly.

15. The medical knot device of claim 14, wherein the manipulation assembly comprises a first inner core and a connecting rod connected to a distal end of the first inner core, a distal end of the connecting rod being detachably connected to a proximal end of the push rod; the limiting assembly comprises a second inner core and a limiting screw connected to the far end of the second inner core, the limiting structure arranged on the lock catch main body comprises a limiting screw hole arranged along the axial direction, and the limiting screw is in threaded connection with the limiting screw hole.

16. The medical knot device of claim 15, wherein the manipulation assembly further comprises a first manipulation knob fixedly connected to the proximal end of the first inner core, and a first barrel member sleeved outside the first inner core and detachably connected to the first manipulation knob; the limiting assembly further comprises a second control button fixedly connected with the near end of the second inner core and a second barrel part sleeved outside the second inner core and fixedly connected with the second control button.

17. The medical knot device of claim 16, further comprising a handle shell, wherein the proximal end of the outer tube is fixedly attached within the handle shell, and wherein the first and second inner cores extend within the handle shell;

the first barrel part is partially arranged in the handle shell, a first retaining ring is arranged on the first barrel part, a first baffle plate and a second baffle plate are arranged in the handle shell at intervals, and the first retaining ring is positioned between the first baffle plate and the second baffle plate;

the part of the second cylinder piece is arranged in the handle shell, a second retainer ring is arranged on the second cylinder piece, a third baffle and a fourth baffle are arranged in the handle shell at intervals, and the second retainer ring is positioned between the third baffle and the fourth baffle.

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