CN211934162U - Driving conversion type locking device - Google Patents

Abstract

The utility model provides a driving conversion type locking device, which comprises a chuck, a push rod component arranged outside the chuck, and a transmission component connected with the push rod component; the push rod assembly comprises a push rod arranged outside the chuck, the chuck is fixed in axial position and elastic, a locking nail with a suture line is accommodated in the chuck in an initial state, and the part of the chuck close to the push rod is gradually inclined outwards from the near end to the far end; the transmission assembly comprises a threaded transmission part and a flexible inner core fixedly connected with the threaded transmission part, and the threaded transmission part is rotationally connected with the push rod assembly; the flexible inner core rotates to drive the threaded transmission part to rotate, and the rotation of the threaded transmission part drives the push rod assembly to move axially, so that the push rod pushes against the chuck, and the chuck is forced to press the locking nail to deform so as to lock a suture thread penetrating through the locking nail.

Description

Driving conversion type locking device

Technical Field

The utility model relates to the technical field of medical equipment, especially, relate to a drive conversion type locking device.

Background

The operation of knotting and fixing suture is often required in the operation, and the traditional surgical operation is operated under the condition of open vision, and the knotting is usually carried out manually by a doctor. However, with advances in technology, various minimally invasive and interventional procedures are becoming more common, such as laparoscopic procedures, transcatheter interventional procedures, and the like. These procedures require only a small operating window to be cut into 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 procedures, if knotting or fixing of the suture in the patient is required, the operator is usually required to perform operations outside the patient through the small operation window to knot or fix the suture in the patient, which requires the suture locking device.

The existing suture locking device fixes a suture penetrating through the inner cavity of a locking nail through the locking nail with a hollow inner cavity and a clamping head which is matched with the locking nail and applies pressure to the locking nail to force the locking nail to deform. As the suture locking device needs to be inserted into a human body, in order to be matched with the physiological anatomical structure of a human body lumen, a tube body between a chuck and a handle of the suture locking device and parts arranged in the tube body need to have certain flexibility. Generally, prior suture locking devices drive the collet against the locking pin by manipulating the handle to push a flexible member distally and a rigid member fixedly attached to the distal end of the flexible member. However, firstly, the suture thread is locked by directly applying a pushing force to the flexible component, and the flexible component is easy to bend and bend in the process of transmitting the pushing force on the flexible component, so that the pushing force is greatly lost, the pushing force cannot be effectively transmitted to the rigid component at the far end of the flexible component, and the chuck cannot effectively press the locking nail, so that the suture thread cannot be reliably locked by the locking nail; secondly, as the direct pushing force is adopted to drive the chuck to be occluded for carrying out the compression of the locking nail and further locking the suture thread penetrating through the inner cavity of the locking nail, when the pushing force is larger, the flexible component in the bending state is difficult to support the rigid component positioned at the far end of the flexible component (the rigid component pushes against the chuck to promote the chuck to extrude the locking nail, the rigid component can drive the far end part of the flexible component to tend to be straightened, namely, the rigid component can swing or rock relative to the far end of the flexible component, and the situation is easy to tear the suturing point.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model lies in, to prior art's defect, provide a lock knot device, can enough reduce thrust loss, ensure that the stylolite is locked reliably by the locking nail, can avoid tearing to the stitching point again.

In order to solve the technical problem, the utility model provides a driving conversion type locking device, which comprises a chuck, a push rod component arranged outside the chuck, and a transmission component connected with the push rod component; the push rod assembly comprises a push rod arranged outside the chuck, the chuck is fixed in axial position and elastic, a locking nail with a suture line is accommodated in the chuck in an initial state, and the part of the chuck close to the push rod is gradually inclined outwards from the near end to the far end; the transmission assembly comprises a threaded transmission part and a flexible inner core fixedly connected with the threaded transmission part, and the threaded transmission part is rotationally connected with the push rod assembly; the flexible inner core rotates to drive the threaded transmission part to rotate, and the rotation of the threaded transmission part drives the push rod assembly to move axially, so that the push rod pushes or loosens the chuck, and the chuck is forced to press the locking nail to deform so as to lock the suture thread penetrating through the locking nail or release the locking nail.

Preferably, the device also comprises an outer sleeve component which is arranged around the chuck, the push rod component and the transmission component; the outer sleeve assembly comprises a sleeve and a flexible outer tube fixedly connected with the sleeve, the chuck and the push rod assembly are accommodated in the sleeve, the chuck is fixedly connected with the sleeve, and the flexible outer tube is sleeved outside the flexible inner core.

Preferably, the proximal end of the collet is closed and a pin perpendicular to the axial direction is inserted into the proximal end of the collet, both ends of the pin being fixed to the sleeve.

Preferably, the screw transmission member is a transmission screw rod; the screw thread driving medium is fixedly connected with a connecting piece, the connecting piece is connected with the push rod component in a rotating mode, and the screw thread driving medium rotates synchronously and moves axially to drive the push rod component to move axially.

Preferably, the screw transmission member is a transmission screw rod; the screw thread transmission part is directly screwed with the push rod assembly, and the screw thread transmission part only rotates to drive the push rod assembly to move along the axial direction.

Preferably, the outer sleeve component further comprises a connecting cylinder, the connecting cylinder is fixedly connected between the sleeve and the flexible outer pipe, and the connecting cylinder is in threaded connection with the threaded transmission part.

Preferably, the push rod assembly further comprises a base coaxial with the threaded transmission part, the push rod is fixedly connected to the base and extends axially, the connecting piece is rotatably connected to the base, and an axial limiting structure is arranged between the connecting piece and the base.

Preferably, telescopic inner wall corresponds the screw drive spare sets up annular flange, the near-end rotation of screw drive spare is inserted and is located in the flange, the periphery wall of screw drive spare in the distal end of flange sets up the backstop ring, the screw drive spare in the solid fixed ring of the near-end fixed connection of flange, the backstop ring with gu fixed ring encloses into the rotating groove, the flange rotationally accept in the rotating groove, the distal end fixed connection of flexible outer tube telescopic near-end.

Preferably, the push rod assembly further comprises a base coaxial with the threaded transmission member, the push rod is fixedly connected to the base and extends in the axial direction, and the threaded transmission member is directly screwed with the base.

Preferably, the flexible inner core comprises a core rod and a flexible inner tube wound on the core rod.

Preferably, the flexible core comprises a flexible inner core and a thread transmission member, wherein the flexible inner core is fixedly connected with the proximal end of the flexible inner core.

Preferably, the handle is further included, the driving member is rotatably disposed at a proximal end of the handle, a through groove is axially formed in the handle, and the proximal end of the flexible inner core penetrates through the through groove and is fixedly connected to the driving member.

Preferably, a rotation hole is formed in the proximal end face of the handle around the through groove, and a rotation shaft rotatably inserted into the rotation hole is arranged at the distal end of the driving piece.

Preferably, a guide rod is fixedly inserted in the handle, a guide groove is formed in the guide rod along the axial direction, and the near end of the flexible inner core is movably contained in the guide groove.

Preferably, the proximal end of the flexible outer tube is fixedly connected to the distal end of the guide rod.

Preferably, the flexible inner tube is a helical structure or a braided mesh structure.

Preferably, the push rod subassembly still includes tangent line blade, tangent line blade in the offside fixed connection of push rod is in on the base, the chuck is close to one side of tangent line blade sets up the through wires hole and supplies the stylolite to wear out, the chuck oppresses the staple and warp the in-process of locking stylolite, tangent line blade cuts off the stylolite that passes through the through wires hole together.

Preferably, the chuck is provided with a cutting groove or a cutting surface corresponding to the cutting blade, and the cutting edge of the cutting blade is inserted into the cutting groove or abutted against the cutting surface to cut off the suture.

Preferably, the far end of the push rod is provided with an abutting block in an inward protruding mode, and the abutting block presses the locking nail to deform when abutting against the chuck.

The application provides a drive conversion type locking device, through the rotation of flexible inner core and screw thread driving medium drives the push rod and moves to the distal end along the axial for the chuck, and the push rod supports with sliding and pushes away the chuck, makes the chuck take place to warp and oppress the staple and warp to the stylolite in the cavity of lock dress nail is worn to locate in the locking. Firstly, the rotation torque of the flexible inner core and the thread transmission part is converted into axial thrust for driving the push rod to axially move by the thread transmission part so as to drive the push rod to axially and slidably push or loosen the chuck, and the thread transmission part is rigid and has a shorter length than the flexible inner core, so that the thrust is not lost, and the thrust can be smoothly and effectively transmitted to the push rod, so that the chuck can effectively press the locking nail to enable the locking nail to be fully deformed, and a suture line is ensured to be reliably locked by the locking nail; secondly, because the flexible inner core only rotates and is not pushed, the push rod and the chuck cannot swing or rock relative to the flexible inner core, and therefore tearing of the seaming point can be avoided.

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 without creative efforts.

Fig. 1 is a schematic perspective view of a driving conversion type locking device according to a first embodiment of the present invention.

Fig. 2 is a sectional view taken along line II-II in fig. 1.

Fig. 3 is an enlarged view of the portion III in fig. 2.

Fig. 4 is a schematic perspective view of a locking pin pressed by a chuck of a driving conversion type locking device according to a first embodiment of the present invention.

Fig. 5 is a cross-sectional view of the locking pin of fig. 4.

Fig. 6 is a schematic structural view of a collet of the driving switching type locking device of fig. 2.

Fig. 7 is a perspective view illustrating a push rod assembly of the driving switching type hitch of fig. 2.

Fig. 8 is a cross-sectional structural schematic view of the push rod assembly of fig. 7.

Fig. 9 is a sectional view of the push rod assembly, the transmission assembly and the driving member of the driving switching type hitch of fig. 2.

Fig. 10 is an enlarged view of the push rod assembly and a portion of the transmission assembly of fig. 9.

Fig. 11 is a perspective view of the handle and guide bar of fig. 2.

Fig. 12 is an exploded view of the handle and guide bar of fig. 11.

Fig. 13 is a cross-sectional structural schematic view of the handle of fig. 12.

Fig. 14 is a perspective view of the assembled structure of the handle, guide rod, flexible outer tube, connector barrel, sleeve and end cap of fig. 2.

FIG. 15 is a cross-sectional view of the handle, guide rod, flexible outer tube, connector, sleeve and end cap of FIG. 14.

Fig. 16-18 are schematic views of a first embodiment of the present invention for a valve repair procedure of a diseased tricuspid valve.

Fig. 19-21 are schematic views of a driving conversion type locking device for fixing a suture thread to a locking pin according to a first embodiment of the present invention.

Fig. 22 is a partially enlarged view of the driving switching type locking device of fig. 19.

Fig. 23 is a partially enlarged view of the driving switching type locking device of fig. 20.

Fig. 24 is a partially enlarged view of the driving switching type locking device of fig. 21.

Fig. 25 is an enlarged view of the XXV portion in fig. 18.

Fig. 26 is a schematic structural view of a drive switching type locking device according to a second embodiment of the present invention.

Fig. 27 is a schematic view of the driving member and a portion of the transmission assembly of the driving conversion type hitch of fig. 26.

Fig. 28 is a perspective view of the drive screw of the drive member of fig. 27.

Fig. 29 is a perspective view of the push rod assembly of fig. 27.

Fig. 30-31 are schematic views of a second embodiment of the present invention for a drive-converting hitch for securing a suture to a staple.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without any creative effort belong to the protection scope of the present invention.

Furthermore, the following description of the various embodiments refers to the accompanying drawings, which are included to illustrate specific embodiments in which the invention may be practiced. Directional phrases used in this disclosure, such as "upper," "lower," "front," "rear," "left," "right," "inner," "outer," "side," and the like, refer only to the orientation of the attached drawing figures and, thus, are used in a better and clearer sense to describe and understand the present invention rather than to 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 thus should not 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, a first embodiment of the present invention provides a driving conversion type locking device 100 for locking a suture thread and a locking nail 300, wherein the driving conversion type locking device 100 includes a chuck 22, a push rod assembly 40 sleeved outside the chuck 22, a transmission assembly 60 connected to the push rod assembly 40, a driving member 70, and a handle 90 disposed at a proximal end. The distal end of the clamping head 22 is provided with a gap 25 for placing the locking nail 300, the locking nail 300 is provided with a threading cavity 301 along the axial direction, and the threading cavity 301 is used for threading a suture. The push rod assembly 40 comprises a push rod 42 arranged outside the chuck 22, the chuck 22 is fixed in the axial position and has elasticity, in the initial state, a locking nail 300 with a suture thread is accommodated in the chuck 22, and the part of the chuck 22 close to the push rod 42 is gradually inclined outwards from the near end to the far end; the transmission assembly 60 comprises a threaded transmission member 62 and a flexible inner core fixedly connected with the threaded transmission member 62, and the threaded transmission member 62 is rotatably connected with the push rod assembly 40; the flexible core rotates to rotate the screw drive 62, and the rotation of the screw drive 62 drives the push rod assembly 40 to move axially, so that the push rod 42 moves axially to push or release the collet 22, so as to force the collet 22 to press the locking nail 300 to deform and lock the suture passing through the locking nail 300 or release the locking nail 300.

In the driving conversion type locking device 100 provided by the present application, the rotation of the flexible inner core and the screw transmission member 62 drives the push rod 42 to move toward the far end along the axial direction relative to the collet 22, and the push rod 42 pushes the collet 22 along the axial direction in a sliding manner, so as to force the collet 22 to press the locking nail 300 to deform and lock the suture thread passing through the locking nail 300. The rotation of the flexible inner core and the screw transmission member 62 is converted to move the push rod assembly 40 along the axial direction, so that the push rod 42 is pushed against the chuck 22 in an axial sliding manner, and the chuck 22 is deformed to lock the suture, on one hand, the rotation torque of the flexible inner core and the screw transmission member 62 is converted into an axial pushing force by which the screw transmission member 62 drives the push rod 42 to move axially, so as to drive the push rod 42 to push or loosen the chuck 22 in an axial sliding manner, and as the screw transmission member 62 is rigid and has a shorter length than the flexible inner core, the pushing force is not lost, and can be smoothly and effectively transmitted to the push rod 42, so that the chuck 22 can effectively press the locking nail 300 to enable the locking nail 300 to be deformed fully, and the suture can be reliably locked; on the other hand, the flexible inner core only rotates and is not pushed, so that the push rod 42 and the chuck 22 are not caused to swing or shake relative to the flexible inner core, and the tearing of the seam point can be avoided.

As shown in fig. 2 and 3, the driving switching locking device 100 further includes a casing assembly 80 surrounding the chuck 22, the push rod assembly 40 and the transmission assembly 60; the threaded driving member 62 is rotatably connected to the outer sleeve member 80, and the threaded driving member 62 rotates relative to the outer sleeve member 80 to move the push rod 42 in the axial direction. Specifically, the outer sheath assembly 80 includes a connecting cylinder 82, a flexible outer tube 84 fixedly connected to a proximal end of the connecting cylinder 82, a sleeve 86 disposed over the collet 22 and the push rod assembly 40, and an end cap 88 covering a distal end of the sleeve 86, wherein the sleeve 86 is fixedly connected to the flexible outer tube 84 through the connecting cylinder 82. The collet 22 and the pushrod assembly 40 are disposed within the sleeve 86, the collet 22 is fixedly coupled to the sleeve 86 such that the axial position of the collet 22 is fixed, and the flexible outer tube 84 is disposed over the flexible inner core. The screw driving member 62 is rotatably inserted into the connecting cylinder 82, and specifically, the screw driving member 62 and the connecting cylinder 82 are driven by screw fit. In this embodiment, an inner circumferential surface of the connecting cylinder 82 is provided with an inner thread, the screw transmission member 62 is a transmission screw rod matched with the inner thread, a distal end of the screw transmission member 62 is fixedly connected with a connecting member 67, the connecting member 67 is rotatably connected with the push rod assembly 40, and the screw transmission member 62 synchronously rotates and axially moves to drive the push rod assembly 40 to axially move. In this embodiment, the internal thread of the connecting cylinder 82 is a triangular thread, and the transmission screw rod is provided with a triangular thread matching the internal thread of the connecting cylinder 82. Of course, the internal threads of the connecting cylinder 82 and the external threads on the driving screw 621 may also be saw-tooth threads, rectangular threads, trapezoidal threads, etc.

The distal end of flexible outer tube 84 is fixedly connected to the proximal end of connecting cylinder 82, connecting cylinder 82 is fixedly connected between sleeve 86 and flexible outer tube 84, the proximal end of flexible outer tube 84 is fixedly connected to the distal end of handle 90, the lumen of flexible outer tube 84 communicates with the lumen of connecting cylinder 82, and connecting cylinder 82 is in threaded connection with threaded transmission 62. The flexible outer tube 84 is a tube body having a certain supporting force, and is preferably a laser-cut outer tube, a spiral structure, a braided mesh structure, or the like. In this embodiment, the flexible outer tube 84 is laser cut. The flexible outer tube 84 may be made of stainless steel, nickel-titanium alloy, cobalt-chromium alloy, etc., in this embodiment, the flexible outer tube 84 is made of nickel-titanium alloy.

In other embodiments, the flexible outer tube 84 may also be a tube body spirally wound with wire materials having a wire diameter of 0.35mm to 0.6mm, a thread pitch of 0.35mm to 0.6mm, and a wire gap of 0.03mm to 0.1mm between adjacent wire materials.

The sleeve 86 is a hollow tube, the proximal end of the sleeve 86 is provided with a clamping ring groove around the inner cavity thereof, and the distal end of the connecting cylinder 82 is fixedly connected with the clamping ring groove of the sleeve 86; the distal end of the sleeve 86 projects distally around its lumen with a snap ring for securing an end cap 88. The peripheral wall of the sleeve 86 is provided with a threading slot 860 near the collet 22, and the threading slot 860 is used for threading out a suture thread which is threaded in the lock nail 300.

The distal end of the end cap 88 defines a suture access opening 880 in communication with the interior cavity of the sleeve 86, and the locking pin 300 can be inserted into the interior cavity of the sleeve 86 through the suture access opening 880. Specifically, the end cap 88 includes a circular cover plate 881 and an annular coupling plate 883 disposed around a periphery of the cover plate 881, the coupling plate 883 securing a distal end of the coupling sleeve 86, and the suture inlet 880 opening axially in a central portion of the cover plate 881.

Referring to fig. 4 and 5, the threading cavity 301 of the locking nail 300 axially penetrates through two opposite ends of the locking nail 300, and the threading cavity 301 is used for accommodating and passing a suture. The locking pin 300 can be collapsed when subjected to mechanical external forces to secure the suture in the threading lumen 301 of the locking pin 300. The locking pin 300 may be of various shapes, e.g., cylindrical, prismatic, oval, etc., so long as it has a threaded cavity 301 for receiving a suture. In this embodiment, the locking pin 300 is formed in a hollow cylindrical shape to reduce the resistance to pressure and to prevent scratching of human tissue. The area of the cross section of the distal end of the locking nail 300 is larger than the area of the cross section of the middle part of the locking nail 300, namely, the outer wall of the distal end of the locking nail 300 is radially provided with an annular truncated cone 303 in a protruding mode. The distal opening of the threading lumen 301 of the locking nail 300 smoothly transitions with the distal surface of the locking nail 300 to avoid the junction therebetween cutting the suture or scratching the internal tissue of the patient. The proximal edge and the distal edge of the outer peripheral surface of the circular truncated cone 303 are both provided with chamfers to prevent the proximal edge and the distal edge of the circular truncated cone 300 from scratching internal tissues of the body of a patient. Preferably, the proximal edge and the distal edge of the outer peripheral surface of the circular truncated cone 303 are rounded. The locking pin 300 is made of a biocompatible material such as stainless steel, pure titanium, nickel titanium, cobalt chromium alloy, and preferably pure titanium or stainless steel.

In other embodiments, in order to improve the coupling force between the crimped nail 300 and the suture, at least one pair of interlocking structures may be disposed in the threading cavity 301 of the nail 300, for example, a convex locking platform and a concave locking hole may be disposed at two positions opposite to the threading cavity 301, when the nail 300 is subjected to external crimping force and begins to deform, the convex locking platform is pressed into the concave locking hole, and when the nail 300 continues to deform, the locking platform and the locking hole are simultaneously deformed until they cannot be separated, and at this time, the suture is firmly fixed in the threading cavity 301 of the nail 300.

In order to improve the coupling force between the crimped lock pin 300 and the suture, an anti-slip structure may be further provided on the inner circumferential surface of the threading cavity 301, for example, an anti-slip pattern or a roughening treatment may be provided on the inner circumferential surface of the threading cavity 301, so that after the lock pin 300 is deformed by external crimping force, the friction force between the suture and the inner circumferential surface of the threading cavity 301 is increased, and the suture is more firmly fixed in the threading cavity 301 of the lock pin 300.

Referring to fig. 6, the chuck 22 includes a first chuck 221 and a second chuck 223 formed integrally and oppositely, and a gap 25 is formed between the first chuck 221 and the second chuck 223. When the driving member 70 drives the screw transmission member 62 to rotate, because the position of the connecting cylinder 82 is fixed, the screw transmission member 62 rotates and moves axially to push the push rod 42 to move axially, i.e. the rotation of the screw transmission member 62 is converted into the axial movement of the push rod 42, so that the push rod 42 pushes the first chuck 221 and the second chuck 223 of the chuck member 22 to move closer to each other, and the first chuck 221 and the second chuck 223 can press the locking nail 300 to deform the locking nail 300 and fix the suture.

In this embodiment, the first collet 221 and the second collet 223 are integrally formed by an elastic hard material, and when the push rod 42 moves axially toward the distal end to slidably push the first collet 221, the first collet 221 elastically deforms and moves toward the second collet 223 to press the locking pin 300. The proximal end of the collet 22 is closed and a pin 24 is disposed perpendicular to the axial direction through the proximal end of the collet 22, with opposite ends of the pin 24 secured to the sleeve 86. Specifically, the pin 24 is inserted into the proximal end of the gap 25, and the two opposite ends of the pin 24 are respectively and fixedly connected to the sleeves 86; the sleeve 86 is provided with two opposite connecting holes along the radial direction, two opposite ends of the pin 24 are fixedly inserted into the two connecting holes respectively, and the pin 24 positions the chuck 22 to prevent the chuck 22 from moving along the axial direction.

As shown in fig. 6, the first and second collets 221 and 223 are disposed in spaced-apart opposition and have their proximal ends connected to each other. A gap 25 is defined between the first clamping head 221 and the second clamping head 223, a pin hole 2211 is formed in the gap 25 adjacent to the connection position of the first clamping head 221 and the second clamping head 223, the pin 24 is inserted into the pin hole 2211, and preferably, the central angle corresponding to the pin hole 2211 is larger than 180 degrees so as to prevent the clamping head 22 from moving towards the near end or the far end along the axial direction. The side of the first clamping head 221 facing away from the second clamping head 223 is provided with an inclined slide guiding surface 2213, and the slide guiding surface 2213 is located at the distal end of the first clamping head 221 and extends obliquely towards the side far away from the gap 25. Specifically, the distal end of the first collet 221 is provided with a protrusion protruding into the gap 25, the side of the protrusion facing the second collet 223 is provided with a first clamping tooth 2215, specifically, the first clamping tooth 2215 is located at the distal end of the side of the first collet 221 facing the second collet 223, the first clamping tooth 2215 includes a plurality of tooth grooves, and each tooth groove extends along a direction substantially perpendicular to the axial direction.

The second jaw 223 is provided with a second clamping tooth 2235 adjacent to the distal end on the side of the first jaw 221 facing the gap 25, and in particular, the second clamping tooth 2235 is located adjacent to the distal end on the side of the second jaw 223 facing the gap 25, and the second clamping tooth 2235 includes a plurality of tooth slots, and each tooth slot of the second clamping tooth 2235 extends in the same direction as the tooth slot of the first clamping tooth 2215. When the first cartridge 221 and the second cartridge 223 are moved toward each other along the pin 24, the first teeth 2215 of the first cartridge 221 and the second teeth 2235 of the second cartridge 223 are misaligned and engaged with each other, so that the first cartridge 221 is elastically deformed toward the second cartridge 223, and the first teeth 2215 and the second teeth 2235 press the locking pin 300 placed in the gap 25 into a shape having a curvature. The proximal end of the side of the second cartridge 223 facing away from the first cartridge 221 is provided with a horizontal slide-guiding surface 2236. Specifically, the sliding guide surface 2236 is provided with a threading hole 2237 communicating with the gap 25, and the threading hole 2237 is adjacent to the proximal end of the second clamping tooth 2235, so that the suture thread passing through the locking nail 300 can pass through the threading hole 2237. A positioning block 2233 is convexly arranged at the far end of the side surface of the second chuck 223 departing from the first chuck 221, the near end surface of the positioning block 2233 is close to the threading hole 2237, and the near end surface of the positioning block 2233 is a tangential surface 2238.

In other embodiments, the proximal surface of the positioning block 2233 defines cutting grooves that extend through opposite sides of the second collet 223 in a direction perpendicular to the axial direction.

Referring to fig. 3 and 7-8, the push rod assembly 40 further includes a base 44 coaxial with the screw transmission member 62 and a tangent blade 46 fixedly connected to the base 44, the push rod 42 is fixedly connected to the base 44 and extends along the axial direction, the connecting member 67 is rotatably connected to the base 44, and an axial limiting structure is disposed between the connecting member 67 and the base 44. The cutting blade 46 is disposed opposite to the push rod 42 at a distance, and the cutting blade 46 slides on the slide guide surface 2236 in the axial direction. The base 44 is axially slidably received in the sleeve 86, and the push rod 42 axially slidably abuts against the guide-slide surface 2213 of the first cartridge 221. In this embodiment, the base 44 is a cylindrical rod, and the tangent blade 46 is fixedly connected to the base 44 at the opposite side of the push rod 42. A stepped hole 440 is axially formed in the middle of the base 44, two opposite ends of the stepped hole 440 respectively penetrate through the proximal end face and the distal end face of the base 44, and the stepped hole 440 includes a large hole 441 located at the distal end of the base 44 and a small hole 443 located at the distal end of the base 44; the pedestal 44 forms a step surface 445 between the large hole 441 and the small hole 443. The outer peripheral wall of the base 44 is provided with two fixing grooves 446 at opposite sides of the stepped hole 440, and the proximal end of the push rod 42 and the proximal end of the tangent blade 46 are fixed to the two fixing grooves 446, respectively.

The end of the push rod 42 facing the tangent blade 46 away from the base 44 is provided with an arc-shaped slide-assisting surface 420, and the slide-assisting surface 420 is used for slidably abutting against the slide-guiding surface 2213 of the first clamping head 221. The distal end of the push rod 42 is provided with a pushing block 421, and the pushing block 421 is used for pressing the lock pin 300 to deform when pushing the chuck 22; specifically, an abutting block 421 is convexly disposed on one side of the pushing rod 42 away from the base 44 toward the cutting blade 46, the sliding-assistant surface 420 is disposed on a side surface of the abutting block 421 facing the cutting blade 46, and a cutting edge 461 is disposed at a distal end of the cutting blade 46. In this embodiment, the outer side of the pushrod 42 is coplanar with the outer side of the pedestal 44; the outer side of the tangent blade 46 is coplanar with the outer side of the base 44. During the process of elastically deforming the jaw member 22 to press the locking nail 300 to be deformed to lock the suture, the thread cutting blade 46 slides with respect to the jaw member 22 until the blade edge 461 presses against the thread cutting surface 2238 to cut the suture passing through the threading hole 2237.

Referring to fig. 2 and 9-10, the driving assembly 60 further includes a flexible inner tube 64 connected to the proximal end of the screw driving element 62 and a stem 66 inserted into the inner cavity of the flexible inner tube 64, and a connecting element 67 is connected between the distal end of the screw driving element 62 and the push rod assembly 40. A flexible inner tube 64 is wrapped around a core rod 66, the flexible inner tube 64 and the core rod 66 together forming the flexible inner core. The screw transmission member 62 includes a transmission screw 621 located at a distal end and a connecting portion 623 disposed at a proximal end of the transmission screw 621, and the transmission screw 621 is screwed to the internal thread of the connecting cylinder 82. The middle part of the far end face of the transmission screw 621 is provided with a positioning hole 624 along the axial direction, and the near end face of the connecting part 623 is provided with a connecting hole 626. The distal end of the flexible inner tube 64 is fixedly connected to the threaded driving member 62, the proximal end of the flexible inner tube 64 is fixedly connected to the driving member 70, and the driving member 70 is used for driving the flexible inner tube 64 and the threaded driving member 62 to rotate. Specifically, the distal end of the flexible inner tube 64 is fixed to the connecting hole 626 of the connecting portion 623. The flexible inner tube 64 is a tube body having a certain supporting force, preferably a tube body of a spiral structure or a woven mesh structure; the flexible inner tube 64 may be made of stainless steel, nitinol, cobalt chrome, or the like. The flexible inner tube 64 is a tube body spirally wound by adopting wire materials to form a spiral structure, the outer diameter of the flexible inner tube 64 is smaller than the inner diameter of the flexible outer tube 84, and the parameters of the flexible inner tube 64 are as follows: the wire diameter of the wire is 0.2 mm-0.5 mm, the thread pitch is 0.2 mm-0.55 mm, and the wire clearance between adjacent wires is 0 mm-0.15 mm. The wall thickness of the flexible inner tube 64 is at least the thickness of one layer of wire, in this embodiment, the wire of the flexible inner tube 64 is stainless steel wire, and the wall thickness of the flexible inner tube 64 is the thickness of two layers of wires stacked. Rotation of the flexible inner tube 64 relative to the connector barrel 82 rotates and moves the screw drive 62 axially.

The core rod 66 is inserted into the inner cavity of the flexible inner tube 64, the core rod 66 is a core rod with certain flexibility, and preferably, the core rod 66 may be made of stainless steel, nickel-titanium alloy, cobalt-chromium alloy, and the like. In this embodiment, the core rods 66 are made of stainless steel, the distal end of each core rod 66 is fixedly connected to the connecting portion 623, and the proximal end of each core rod 66 is fixedly connected to the driving member 70. The provision of the core rod 66 facilitates the winding of the wire thereon to form the flexible inner tube 64 and enhances the twist control of the flexible inner core.

In this embodiment, the connecting member 67 is a connecting pin, and the connecting member 67 includes a connecting rod 672 inserted into the small hole 443 and the positioning hole 624 of the stepped hole 440, and a stopper 674 disposed at a distal end of the connecting rod 672 and received in the large hole 441 of the stepped hole 440. The connecting rod 672 is fixedly connected to the positioning hole 624, the connecting rod 672 is rotatably inserted into the small hole 443, the stopper 674 is rotatably accommodated in the large hole 441, the stopper 674 stops on the stepped surface 445, and the axial limiting structure between the connecting piece 67 and the base 44 refers to the stepped hole 440 and the stopper 674. The drive screw 621 rotates and moves axially to rotate the connecting member 67 in the stepped hole 440, and simultaneously the distal end of the drive screw 621 pushes the push rod assembly 40 to move axially toward the distal end, or the stopper 674 pulls the push rod assembly 40 to move axially toward the proximal end.

In other embodiments, the connecting member 67 may also be fixedly connected to the push rod assembly 40, the connecting member 67 is rotatably connected to the screw driver 62, and a limiting structure for preventing the connecting member 67 from moving axially relative to the screw driver 62 is disposed between the connecting member 67 and the screw driver 62, for example, the screw driver 62 is provided with an annular limiting groove along the circumferential direction on the inner circumferential wall of the positioning hole 624, and the outer circumferential wall of the connecting rod 672 is convexly provided with a limiting ring rotatably received in the limiting groove, so that the connecting member 67 is rotatably connected to the screw driver 62.

As shown in fig. 2 and 9, the driving member 70 is connected to the proximal end of the transmission assembly 60, specifically, the driving member 70 is a rotating member rotatably disposed at the proximal end of the handle 90, and the proximal ends of the flexible inner tube 64 and the core rod 66 are fixedly connected to the driving member 70. The middle part of the far end surface of the driving element 70 is provided with a rotating shaft 72 in a protruding mode along the axial direction, the edge of the far end surface of the driving element 70 is provided with an annular flange 74 along the axial direction, the extending length of the rotating shaft 72 is larger than that of the flange 74, and an annular accommodating groove 75 is defined between the rotating shaft 72 and the flange 74. The driving member 70 has a central through hole 76 formed in the axial direction, the through hole 76 is located in the central portion of the rotating shaft 72, and the through hole 76 is used for passing the flexible inner tube 64 and the proximal end of the core rod 66. The proximal end face of the driving member 70 is provided with a positioning hole 77 around the through hole 76, a positioning block 78 is fixed in the positioning hole 77, the proximal ends of the flexible inner tube 64 and the core bar 66 penetrate through the through hole 76 and then are fixedly connected to the positioning block 78, and the rotation of the driving member 70 drives the flexible inner tube 64 and the core bar 66 to rotate together through the positioning block 78. The outer wall of the driving member 70 is provided with an anti-slip mechanism 79, and the driving member 70 can be conveniently rotated by holding the anti-slip mechanism 79 by hand.

Referring to fig. 1-2 and 11-13, the driving member 70 is rotatably connected to the proximal end of the handle 90, the handle 90 is axially provided with a through slot 910, and the proximal end of the flexible core is fixedly connected to the driving member 70 through the through slot 910. The handle 90 comprises a shell 91 and a guide rod 96 inserted in the shell 91, wherein the guide rod 96 is used for positioning the flexible inner core. In this embodiment, the cross section of the housing 91 is a polygonal rod-shaped structure, a rotation hole 93 is formed around the through slot 910 on the proximal end surface of the housing 91, the rotation hole 93 is used for rotatably connecting the distal end of the driving member 70, and specifically, the rotation shaft 72 of the driving member 70 is rotatably inserted into the rotation hole 93. The distal end face of the handle 90 is provided with a positioning hole 95 around the through groove 910, the guide rod 96 is inserted into the positioning hole 95, the guide rod 96 is provided with a guide groove 962 along the axial direction, the proximal end of the flexible inner core is movably accommodated in the guide groove 962, and the proximal end of the flexible inner core is prevented from being twisted and warped when rotating. The distal end of the guide 96 is provided with a cover plate 964. A connecting pipe 966 is convexly arranged in the middle of the distal end face of the cover plate 964, the guide groove 962 is communicated with the inner cavity of the connecting pipe 966 after penetrating through the cover plate 964, and the proximal end of the flexible inner core is connected to the driving member 70 after penetrating through the connecting pipe 966, the guide groove 962 and the through groove 910; the proximal end of flexible outer tube 84 is fixedly attached to a connecting tube 966. The proximal end of the outer peripheral wall of the guide rod 96 is provided with at least one fixing hole 967, the outer peripheral wall of the housing 91 is provided with a connecting hole 913 communicated with the positioning hole 95, after the guide rod 96 is inserted into the positioning hole 95, the cover plate 964 is attached to the distal end surface of the housing 91, the fixing hole 967 of the guide rod 96 corresponds to the connecting hole 913 of the housing 91, and the locking rod is inserted into the connecting hole 913 and the fixing hole 967, so that the guide rod 96 is fixedly connected with the housing 91. In other embodiments, the cross-section of the housing 91 may be a rod-like structure with a circular, oval, rectangular or irregular shape.

The handle 90 is provided with at least one length scale 915 along the axial direction adjacent to the driving member 70, and the at least one length scale 915 is used for displaying the displacement amount of the driving member 70 moving along the axial direction. Specifically, a plurality of length scales 915 are disposed at the proximal end of the outer peripheral surface of the housing 91, and the plurality of length scales 915 are arranged in a circle along the circumference of the housing 91 so as to facilitate observation of the displacement of the driving member 70 moving along the axial direction. When the distal face of flange 74 of driver 70 is aligned with 0 on length scale 915, first and second collets 221 and 223 of collet 22 are in a fully open state, and push rod 42 does not exert an axial pushing force on collet member 22; when the driving member 70 rotates and moves axially until the distal end surface of the flange 74 is aligned with a certain scale value, such as 5, on the length scale 915, the push rod 42 pushes the collet 22, and the first collet 221 and the second collet 223 of the collet 22 press the locking nail 300 to deform and fix the suture thread passing through the locking nail 300. The above-mentioned certain scale value refers to the scale value that the first clamping head 221 and the second clamping head 223 squeeze the locking nail 300 to deform so as to realize that the locking nail 300 firmly fixes the suture line, and the certain scale value can be set by itself according to the actual needs. The driving member 70 rotates to rotate the flexible core and the screw driving member 62, the screw driving member 62 is screwed to the internal thread of the connecting cylinder 82, and the connecting cylinder 82 is fixed in the axial position, so that the screw driving member 62 rotates and moves axially, and the push rod 42, the flexible core and the driving member 70 move axially accordingly, when the driving member 70 moves axially until the distal end surface of the flange 74 faces the certain scale, the collet 22 has pressed the locking nail 300 to deform and fix the suture thread passing through the locking nail 300, and at this time, the driving member 70 can be stopped from rotating. The outer peripheral surface of the handle 90 is provided with an anti-slip mechanism 917 for easy gripping.

Referring to fig. 1-3 and 14-15, when the driving conversion type locking device 100 is assembled, the guide rod 96 is inserted into the positioning hole 95 of the handle 90, such that the guide slot 962 faces the through slot 910, the fixing hole 967 faces the connecting hole 913, and the locking rod is inserted into the connecting hole 913 and the fixing hole 967; the rotating shaft 72 of the driving member 70 is rotatably inserted into the rotating hole 93 of the handle 90; the proximal end of the flexible inner core sequentially passes through the connecting pipe 966, the guide groove 962, the through groove 910 and the through hole 76 and is fixed in the positioning hole 77 of the driving member 70 through the positioning block 78; fixing the distal end of the flexible inner core to the connecting hole 626 of the screw driver 62, and sleeving the flexible outer tube 84 outside the screw driver 62 and the flexible inner tube 64; after the transmission screw 621 of the screw transmission member 62 is screwed into the internal thread of the connecting cylinder 82, the distal end of the flexible outer tube 84 is fixedly connected to the proximal end of the sleeve 86 through the connecting cylinder 82, and the proximal end of the flexible outer tube 84 is fixedly connected to the connecting tube 966; placing the push rod assembly 40 at the distal end of the connecting cylinder 82 so that the proximal end face of the push rod assembly 40 faces the distal end face of the connecting cylinder 82, inserting the connecting rod 672 of the connecting member 67 into the stepped hole 440 of the base 44 and then fixedly connecting the connecting rod 672 to the positioning hole 624 of the screw driver 62; securing the collet 22 to the distal end of the sleeve 86 such that the threadable bore 2237 of the second collet 223 is aligned with the threadable slot 860 of the sleeve 86 and the opposite ends of the pin 24 are secured to the sleeve 86; sleeving the sleeve 86 outside the push rod assembly 40, wherein the proximal end of the sleeve 86 is fixedly connected to the distal end of the connecting cylinder 82, so that the collet 22 is located between the push rod 42 and the tangent blade 46, the push rod 42 contacts the first collet 221, and the cutting edge 461 of the tangent blade 46 faces the tangent plane 2238; the end cap 88 is then placed over the distal end of the sleeve 86 such that the proximal end of the end cap 88 is fixedly attached to the distal end of the sleeve 86 and the suture inlet 880 of the end cap 88 is positioned over the void 25.

Referring to fig. 16 to 25, the procedure of using the driving conversion type locking device 100 provided by the present invention is described below by taking a valve repair of a tricuspid valve 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 anterior leaflet, the posterior leaflet and the septal leaflet are well closed, thereby ensuring that blood flows 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, the tricuspid valve cannot be restored to a completely closed state as in a normal state, but an incomplete closing phenomenon occurs, and the impulse of blood flow further causes the valve leaflets to fall into the right atrium, so that blood backflow is caused. To tricuspid valve regurgitation, can adopt the intervention mode to implant the stylolite to each leaflet, then use the utility model provides a lock knot device is in the same place the seam on each leaflet and line lock knot to implement reason to reason and repair, specific process is as follows:

the first step is as follows: as shown in fig. 16, firstly, one or more sutures 500 with elastic pads 501 are respectively implanted into the anterior leaflet, the posterior leaflet and the septal leaflet of the tricuspid valve of a patient, and the point contact between the sutures 500 and the leaflets is converted into the surface contact between the elastic pads 501 and the leaflets, so that the risk of tearing the leaflets can be effectively reduced;

the second step is that: as shown in fig. 17, 19 and 22, a plurality of sutures 500 on three leaflets are all threaded into the threading cavity 301 of the locking nail 300 of the driving conversion type locking device 100 outside the patient, and the proximal ends of the sutures 500 are sequentially threaded through the threading cavity 301 of the locking nail 300, the gap 25 between the first clamping head 221 and the second clamping head 223 and the threading hole 2237 and then pass out of the threading groove 860 of the sleeve 86;

the third step: pushing the distal end of the driven conversion type locking device 100 into the right atrium of the heart through the femoral vein by means of a bending sheath (not shown), moving the proximal end towards the valve leaflets of the tricuspid valve, and simultaneously pulling the suture thread 500 until the distal end of the driven conversion type locking device 100 reaches a preset position in the right atrium;

the fourth step: adjusting the tightness of the three leaflet sutures 500 of the anterior, posterior and septal leaflets, respectively, while determining the state of the tricuspid valve with the lightest regurgitation by ultrasound, and when this state is reached, stopping adjusting and maintaining the tightness of the three sets of sutures 500, i.e. maintaining the relative positions between the anterior, posterior and septal leaflets of the tricuspid valve;

the fifth step: as shown in fig. 20 and 23, the driving member 70 on the handle 90 is rotated, and the rotation of the driving member 70 drives the flexible core and the screw driving member 62 to rotate, because the screw driving member 62 is screwed to the internal thread of the connecting cylinder 82, and the connecting cylinder 82 is fixed in the axial position, so that the screw driving member 62 rotates and moves axially, thereby driving the driving member 70, the flexible core and the screw driving member 62 to move axially and distally along the rotating edge, the screw driving member 62 pushes the push rod assembly 40 to move axially and distally, during the axial distal movement of the push rod assembly 40, the push rod 42 moves distally relative to the collet 22, the sliding-assistant surface 420 of the push rod 42 continuously presses the sliding-guide surface 2213 on the collet member 22, so that the first collet 221 of the collet 22 approaches the second collet 223, and the first clamping tooth 2215 and the second clamping tooth 2235 press the locking pin 300 accommodated in the gap 25 until the locking pin 300 deforms, the three groups of sutures 500 in the locking nail 300 are locked together, meanwhile, the cutting edge 461 of the cutting blade 46 is pressed against the tangent plane 2238 of the second clamping head 223, the cutting blade 46 smoothly cuts off the three groups of sutures 500 at the proximal side of the locking nail 300, and then the three groups of redundant sutures 500 are drawn out of the patient;

and a sixth step: as shown in fig. 18, 21 and 24, the driving member 70 of the driving handle 90 rotates in a reverse direction, the reverse rotation of the driving member 70 drives the flexible core and the screw driving member 62 to rotate in a reverse direction, so that the driving member 70, the flexible core and the screw driving member 62 move axially and proximally simultaneously, the screw driving member 62 pulls the push rod assembly 40 through the connecting member 67 to move axially and proximally, and the sliding-assistant surface 420 of the push rod 42 continuously releases the pressing force from the sliding-guide surface 2213 of the collet member 22 during the axial and proximal movement of the push rod assembly 40 until the collet 22 returns to the initial position by its own elastic resilience. The deformed locking pin 300 is released from the distal end of the sheath member 80 from the space 25 of the collet 22, and separated from the driving conversion type locking device 100;

the seventh step: as shown in fig. 18 and 25, the driving conversion type knotting device 100 is withdrawn from the patient, and the locking nail 300 is left in the patient, at which time the locking nail 300 fixes the three groups of suture threads 500 passing through the anterior leaflet, the posterior leaflet, and the septal leaflet, respectively, and the anterior leaflet, the posterior leaflet, and the septal leaflet of the tricuspid valve are repaired.

It can be understood that, the above description only describes the use process of the driving conversion type locking device by taking the driving conversion type locking device as an example for performing the intervention type tricuspid valve repair process, and the driving conversion type locking device of the present invention can also be used for locking and fixing the suture thread in other operation processes.

The utility model discloses a drive conversion type locking device 100 is particularly useful for following scene, if:

performing an interventional mitral valve repair procedure via a path of femoral vein-right atrium-interatrial septum-left atrium-mitral valve;

performing an interventional mitral valve repair procedure via a femoral artery-aortic arch-aortic valve-left ventricle-mitral valve pathway;

interventional mitral valve repair procedures are performed via the jugular vein-right atrium-interatrial septum-left atrium-mitral valve pathway.

The following scenario applies as well: (interventional tricuspid valve repair procedure is performed via the jugular vein-right atrium-tricuspid valve approach. by way of minimally invasive intervention, the driving transfix apparatus 100 is operated outside the patient's body to secure the suture 500 implanted on the leaflets by the locking staples 300.

In other embodiments, the pushrod assembly 40 is connected to the sleeve 86 by axially extending guide slots and bars to ensure that the pushrod assembly 40 only slides axially within the sleeve 86 without rotating; specifically, the outer wall of the push rod 42 is provided with a guide bar extending along the axial direction, and the inner circumferential surface of the sleeve 86 is provided with a guide groove corresponding to the guide bar; alternatively, the outer wall of the push rod 42 is provided with a guide groove extending along the axial direction, and the inner circumferential surface of the sleeve 86 is provided with a guide bar corresponding to the guide groove, and the guide bar can slide along the axial direction in the guide groove.

Referring to fig. 26 to fig. 29, a driving conversion type locking device according to a second embodiment of the present invention has a structure similar to that of the first embodiment, except that: the structure of the push rod assembly 40a and the screw transmission member 62a in the second embodiment is slightly different from that in the first embodiment, and the connection structure of the push rod assembly 40a and the screw transmission member 62a is slightly different from that in the first embodiment, as follows:

the driving conversion type locking device in the second embodiment also includes a chuck 22, a push rod assembly 40a, a transmission assembly and an outer casing assembly 80a, the screw transmission member 62a is rotatably connected to the outer casing assembly 80a, the screw transmission member 62a is in screw-fit transmission with the push rod assembly 40a, the screw transmission member 62a only rotates, and the rotation of the screw transmission member 62a is converted into the axial movement of the push rod 42 through the screw transmission between the screw transmission member 62a and the push rod assembly 40 a.

As shown in fig. 26 to 30, the screw driver 62a includes a driving screw 621 at a distal end and a connecting rod 625 extending axially from a proximal end of the driving screw 621, and a stop ring 627 is radially disposed on an outer wall of the proximal end of the driving screw 621. The base 44a of the push rod assembly 40a in the second embodiment is formed by replacing the stepped hole of the base 44 with a screw hole 444 on the basis of the structure of the push rod assembly 40 in the first embodiment, and the transmission screw 621 and the screw hole 444 can be matched in a threaded manner.

As shown in fig. 26, the outer sheath assembly 80a omits the connecting cylinder 82 of the outer sheath assembly 80 in the first embodiment, an annular flange 862 is disposed on the inner wall of the sleeve 86 corresponding to the screw driver 62a, the proximal end of the screw driver 62a is rotatably inserted into the flange 862, a stop ring 627 is disposed on the outer peripheral wall of the screw driver 62a at the distal end of the flange 862, the screw driver 62a is fixedly connected to a fixing ring 68 at the proximal end of the flange 862, the stop ring 627 and the fixing ring 68 define a rotation groove, the flange 862 is rotatably received in the rotation groove, the distal end of the flexible outer tube 84 is fixedly connected to the proximal end of the sleeve 86, and a through hole 864 extending in the axial direction is formed in the middle of the.

Referring to fig. 26-27, the driving screw 621 is screwed into the screw hole 444 from the proximal end of the push rod assembly 40 a; the proximal end of the connecting rod 625 is fixedly connected with the distal end of the flexible inner tube 64 through the fixing ring 68 after passing through the through hole 864 of the flange 862; at this time, the stop ring 627 and the fixing ring 68 enclose a rotation slot, the flange 862 is rotatably accommodated in the rotation slot, the stop ring 627 is stopped at a distal end face of the flange 862, and the fixing ring 68 is stopped at a proximal end face of the flange 862 to limit the connecting rod 625 to only rotate in the through hole 864, so as to prevent the connecting rod 625 from moving in the axial direction; then the collet 22 is mounted at the distal end of the inner cavity of the sleeve 86, so that the threading hole 2237 of the second collet 223 is opposite to the threading groove 860 of the sleeve 86, the two opposite ends of the pin 24 are respectively fixed to the sleeve 86, the collet 22 is located between the push rod 42 and the thread cutting blade 46, the push rod 42 contacts the first collet 221, and the cutting edge 461 of the thread cutting blade 46 is opposite to the thread cutting surface 2238; the end cap 88 is then placed over the distal end of the sleeve 86 such that the proximal end of the end cap 88 is fixedly attached to the distal end of the sleeve 86 and the suture inlet 880 of the end cap 88 is positioned over the void 25.

In this embodiment, the connecting tube 82 is omitted and the driving screw 621 of the screw driving element 62a directly drives the base 44a of the push rod assembly 40a through screw-fitting, so that the space is saved.

The driving switching type locking device of the second embodiment is used similarly to the first embodiment, and the specific process is as follows:

the first step is as follows: as shown in fig. 16, firstly, one or more sutures 500 with elastic pads 501 are respectively implanted into the anterior leaflet, the posterior leaflet and the septal leaflet of the tricuspid valve of a patient, and the point contact between the sutures 500 and the leaflets is converted into the surface contact between the elastic pads 501 and the leaflets, so that the risk of tearing the leaflets can be effectively reduced;

the second step is that: as shown in fig. 30, a plurality of sutures 500 on three valve leaflets are all threaded into the threading cavity 301 of the locking nail 300 outside the patient, and the proximal ends of the sutures 500 pass through the threading cavity 301 of the locking nail 300, the gap 25 between the first clamping head 221 and the second clamping head 223 and the threading hole 2237 in sequence and then pass out of the threading groove 860 of the sleeve 86;

the third step: pushing the distal end of the actuated switching locking device into the right atrium of the heart via the femoral vein by means of a bending sheath (not shown), moving closer towards the leaflets of the tricuspid valve while pulling the suture 500 until the distal end of the actuated switching locking device reaches a predetermined position in the right atrium;

the fourth step: adjusting the tightness of the three leaflet sutures 500 of the anterior, posterior and septal leaflets, respectively, while determining the state of the tricuspid valve with the lightest regurgitation by ultrasound, and when this state is reached, stopping adjusting and maintaining the tightness of the three sets of sutures 500, i.e. maintaining the relative positions between the anterior, posterior and septal leaflets of the tricuspid valve;

the fifth step: as shown in fig. 31, rotation of the driving member on the handle rotates the flexible core and the threaded drive member 62, i.e., the connecting rod 625 is rotated in situ within the bore 864, causing the seat 44a to move axially distally, during the axial distal movement of the push rod assembly 40a, the push rod 42 moves distally relative to the collet piece 22, the slide-aid surface 420 of the push rod 42 continuously presses the slide-guide surface 2213 on the collet piece 22, the first clamping head 221 of the clamping head piece 22 is close to the second clamping head 223, the first clamping teeth 2215 and the second clamping teeth 2235 press the locking nail 300 in the gap 25 until the locking nail 300 is deformed, the suture 500 in the locking nail 300 is locked together, meanwhile, the cutting edge 461 of the cutting blade 46 abuts against the cutting surface 2238 of the second collet 223, the cutting blade 46 smoothly cuts the three groups of sutures 500 at the proximal side of the locking nail 300, and then the three groups of redundant sutures 500 are drawn out of the patient;

and a sixth step: the driver 70 on the drive handle 90 is rotated in the opposite direction, and the opposite rotation of the driver 70 drives the flexible core and screw driver 62 to rotate in the opposite direction, i.e., the connecting rod 625 rotates in the through hole 864, so that the base 44a moves axially and proximally, and during the axial and proximal movement of the push rod assembly 40a, the slide-aid surface 420 of the push rod 42 continuously releases the pressing force from the slide-guide surface 2213 on the collet piece 22 until the collet piece 22 is resilient to the initial position by its own elastic force. The deformed locking pin 300 is released from the gap 25 of the collet 22 and the distal end of the outer sleeve member 80, and separated from the driving conversion type locking device;

the seventh step: the driving transformation type locking device is withdrawn from the patient, the locking nail 300 is left in the patient, and at this time, the locking nail 300 fixes the three groups of suture threads 500 which respectively pass through the anterior leaflet, the posterior leaflet and the septal leaflet together, and the anterior leaflet, the posterior leaflet and the septal leaflet of the tricuspid valve are repaired.

The above is an implementation manner of the embodiments of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements and decorations can be made without departing from the principles of the embodiments of the present invention, and these improvements and decorations are also considered as the protection scope of the present invention.

Claims (19)

1. A driving conversion type locking device is characterized by comprising a chuck, a push rod assembly arranged outside the chuck and a transmission assembly connected with the push rod assembly; the push rod assembly comprises a push rod arranged outside the chuck, the chuck is fixed in axial position and elastic, a locking nail with a suture line is accommodated in the chuck in an initial state, and the part of the chuck close to the push rod is gradually inclined outwards from the near end to the far end; the transmission assembly comprises a threaded transmission part and a flexible inner core fixedly connected with the threaded transmission part, and the threaded transmission part is rotationally connected with the push rod assembly; the flexible inner core rotates to drive the threaded transmission part to rotate, and the rotation of the threaded transmission part drives the push rod assembly to move axially, so that the push rod pushes against the chuck, and the chuck is forced to press the locking nail to deform so as to lock a suture thread penetrating through the locking nail.

2. The drive conversion type locking device according to claim 1, further comprising an outer jacket assembly surrounding the chuck, the push rod assembly and the transmission assembly; the outer sleeve assembly comprises a sleeve and a flexible outer tube fixedly connected with the sleeve, the chuck and the push rod assembly are accommodated in the sleeve, the chuck is fixedly connected with the sleeve, and the flexible outer tube is sleeved outside the flexible inner core.

3. The drive conversion type locking device as claimed in claim 2, wherein the proximal end of the collet is closed and a pin perpendicular to the axial direction is inserted into the proximal end of the collet, both ends of the pin being fixed to the sleeve.

4. The drive converting hitch apparatus of claim 2, wherein said threaded drive member is a drive screw; the screw thread driving medium is fixedly connected with a connecting piece, the connecting piece is connected with the push rod component in a rotating mode, and the screw thread driving medium rotates synchronously and moves axially to drive the push rod component to move axially.

5. The drive converting hitch apparatus of claim 2, wherein said threaded drive member is a drive screw; the screw thread transmission part is directly screwed with the push rod assembly, and the screw thread transmission part only rotates to drive the push rod assembly to move along the axial direction.

6. The drive-converting hitch apparatus of claim 4, wherein said outer sleeve assembly further comprises a connector barrel fixedly connected between said sleeve and said flexible outer tube, said connector barrel being threadably engaged with said threaded drive member.

7. The drive conversion type knotting apparatus of claim 6, wherein the push rod assembly further comprises a base coaxial with the screw transmission member, the push rod is fixedly connected to the base and extends axially, the connecting member is rotatably connected to the base, and an axial limiting structure is disposed between the connecting member and the base.

8. The drive conversion type knotting apparatus of claim 5, wherein the inner wall of the sleeve is provided with an annular flange corresponding to the screw driver, the proximal end of the screw driver is rotatably inserted into the flange, the outer peripheral wall of the screw driver is provided with a stop ring at the distal end of the flange, the screw driver is fixedly connected to a fixed ring at the proximal end of the flange, the stop ring and the fixed ring form a rotation groove, the flange is rotatably received in the rotation groove, and the distal end of the flexible outer tube is fixedly connected to the proximal end of the sleeve.

9. The drive conversion latch according to claim 8, wherein the push rod assembly further comprises a base coaxial with the threaded drive member, the push rod is fixedly attached to the base and extends axially, and the threaded drive member is directly threadedly engaged with the base.

10. The drive-converting knotting apparatus of claim 1, wherein the flexible core comprises a core rod and a flexible inner tube wound around the core rod.

11. The drive conversion type knotting apparatus of any one of claims 2 to 10, further comprising an actuating member for driving the flexible core and the threaded drive member to rotate, the actuating member being fixedly attached to the proximal end of the flexible core.

12. The drive conversion type knotting apparatus of claim 11, further comprising a handle, wherein said driving member is rotatably disposed at a proximal end of said handle, said handle is axially open with a through slot, and a proximal end of said flexible core is fixedly connected to said driving member through said through slot.

13. The drive conversion type locking device as claimed in claim 12, wherein a rotation hole is formed around the through groove on the proximal end surface of the handle, and a rotation shaft rotatably inserted into the rotation hole is provided on the distal end of the driving member.

14. The drive conversion type knotting apparatus of claim 13, wherein a guide rod is fixedly inserted into the handle, the guide rod has a guide groove along an axial direction, and a proximal end of the flexible inner core is movably received in the guide groove.

15. The drive-converting knot device of claim 14, wherein a proximal end of the flexible outer tube is fixedly attached to a distal end of the guide rod.

16. The drive-converting knotting apparatus of claim 10, wherein the flexible inner tube is a helical structure or a braided mesh structure.

17. The device of claim 7 or 9, wherein the push rod assembly further comprises a thread cutting blade, the thread cutting blade is fixedly connected to the base at an opposite side of the push rod, a thread hole is formed in a side of the collet adjacent to the thread cutting blade for the thread to pass through, and the thread cutting blade cuts the thread passing through the thread hole when the collet presses the locking nail to deform and lock the thread.

18. The drive-converting hitch device of claim 17, wherein said collet is provided with a cutting slot or a cutting surface corresponding to said cutting blade, and wherein a cutting edge of said cutting blade is inserted into said cutting slot or abutted against said cutting surface to cut said suture.

19. The device of claim 1, wherein the pushing rod has a distal end protruding inward to form a pushing block, and the pushing block pushes the collet to deform the locking pin.

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