Implant capture extraction deviceTechnical Field
The invention relates to the technical field of medical instruments, in particular to an implant capturing and taking-out device.
Background
In the implantation intervention operation, it is sometimes necessary to implant implants such as fasteners, valve clamps and the like into human organs, and make these implants stay in the patient permanently or for a period of time, which plays a key role in the health and recovery of the patient. However, if the implant is not accurately positioned or angled, or if the implant is loosened or displaced by the influence of the blood flow of the human body after being implanted in the patient, or if the implant fails due to aging or the like, the implant needs to be taken out of the patient.
However, since the shape and the specification of the implant are different, the existing implant taking-out apparatus mainly has two types, namely, a connecting piece which is consistent with the shape and the size of the end part of the implant is arranged at the front end of a pipe body of the apparatus, for example, a sleeve with internal threads is arranged for a fastening nail, and the sleeve is connected with the end part of the fastening nail in a threaded manner and then taken out;
In addition, the implant often generates endothelialization with organ tissues of a patient after being implanted into the patient for a period of time, and at the moment, when the implant is taken out by adopting an implantation intervention mode, the implant pulls the organ tissues of the patient, so that the problems of high taking-out difficulty and great wound to the patient are caused.
Disclosure of Invention
It is an object of the present invention to provide an implant capture extraction device that at least alleviates at least one of the above-mentioned technical problems of the prior art.
In order to achieve the above purpose, the embodiment of the present invention adopts the following technical scheme:
embodiments of the present invention provide an implant capture retrieval device comprising an outer tube assembly and an inner tube assembly;
The outer tube assembly comprises an outer tube handle and an outer tube, wherein the proximal end of the outer tube is fixedly connected to the inside of the outer tube handle;
The inner tube assembly comprises an inner tube, an inner tube handle, a jaw handle and a push-pull mechanism, wherein the proximal end of the inner tube is fixedly connected with the inner tube handle, the distal end of the inner tube is hinged with at least three groups of jaw arms which are arranged at intervals along the circumferential direction of the inner tube, the jaw handle is movably arranged on the inner tube handle, one end of the push-pull mechanism is in transmission connection with each group of jaw arms, and the other end of the push-pull mechanism is connected with the jaw handle;
The inner tube passes through the outer tube, the inner tube handle is arranged at the proximal end side of the outer tube handle, and the inner tube handle can axially and relatively slide with the outer tube handle so that the at least three groups of claw arms extend out of or retract into the distal end of the outer tube.
In an alternative technical scheme of the embodiment of the invention, the inner tube comprises a main body inner tube section and a distal inner tube section which are fixedly or integrally connected;
the push-pull mechanism comprises a central hinging block and a push-pull piece, and the central hinging block is suspended at the far end side of the far-end inner pipe section;
The clamping arms are respectively in a bending shape protruding from the inner side to the outer side, the proximal ends of the fixed arms are fixedly connected to the edge area of the distal end face of the distal inner pipe section, the proximal ends of the hinged arms are hinged with the distal ends of the fixed arms, the distal ends of the clamping arms are suspended, the proximal ends of the clamping arms are hinged with connecting convex parts arranged on the outer wall of the central hinging block, and the positions of the clamping arms close to the proximal ends are hinged with the distal ends of the hinged arms;
The push-pull piece penetrates through the inner tube, the far end of the push-pull piece is fixedly connected with the central hinging block, and the near end of the push-pull piece is fixedly or in transmission connection with the claw handle;
The jaw handle is movable relative to the inner tube handle, and the push-pull member can be pulled in a proximal direction relative to the inner tube under a first working condition, so that distal ends of the clamping arms of the at least three groups of jaw arms are closed inwards along the radial direction of the distal inner tube section, and the push-pull member is pushed in a distal direction relative to the inner tube under a second working condition, so that distal ends of the clamping arms of the at least three groups of jaw arms are opened outwards along the radial direction of the distal inner tube section.
Further alternatively, the push-pull member is a push-pull wire, and the push-pull mechanism further comprises a return spring;
The inner tube further comprises a tube seat, wherein the distal end of the inner tube section of the main body is connected with the proximal end of the tube seat, the proximal end of the inner tube section of the distal end is connected with the distal end of the tube seat, and an axial through hole is formed in the tube seat;
the push-pull wire sequentially passes through the main body inner pipe section, the axial through hole of the pipe seat and the end plate perforation of the distal inner pipe section, and a stop block is fixedly connected to the part, which is positioned inside the distal inner pipe section and is close to the end plate, of the push-pull wire;
The device comprises a tube seat, a stopper, a return spring, a push-pull wire, a pull wire and at least three groups of claw arms, wherein the tube seat is arranged in the tube seat, the return spring is arranged in the tube seat in the distal end inner tube section and is positioned between the tube seat and the stopper, the return spring is configured to always push the stopper in the distal end direction relative to the tube seat in order to enable the distal ends of the clamping arms of the at least three groups of claw arms to open outwards along the radial direction of the tube seat in the distal end inner tube section, and the push-pull wire is pulled in the proximal end direction relative to the inner tube to drive the stopper to compress the return spring in the proximal end direction so as to enable the distal ends of the clamping arms of the at least three groups of claw arms to close inwards along the radial direction of the tube seat in the tube seat.
Optionally, the claw handle is a knob handle, the axial direction of the inner tube is the axial direction of the inner tube handle, and the claw handle is coaxial with the inner tube handle, is axially limited to the inner tube handle, and can rotate circumferentially relative to the inner tube handle;
The push-pull part is a push-pull wire or push-pull rod, the push-pull mechanism further comprises a transmission rod, the transmission rod is circumferentially limited and axially slidably arranged in the inner pipe handle, the claw handle is sleeved outside the transmission rod and is in threaded connection with the transmission rod, and the proximal end of the push-pull part is fixedly connected with the transmission rod.
Optionally, each set of the jaw arms further comprises a catch clip, respectively;
the capturing clamping piece comprises a clamping piece body and a mounting block;
The clamping piece body is provided with a length direction, a width direction and a thickness direction, two opposite side surfaces in the thickness direction of the clamping piece body are respectively a clamping piece inner surface and a clamping piece outer surface, and at least the side line of the clamping piece inner surface on a section formed by cutting the clamping piece body along the width direction and the thickness direction is an arc line with the middle part protruding towards the clamping piece outer surface direction;
The mounting block is fixedly or integrally connected to the outer surface of the clamping piece, the mounting block is rotatably mounted at the far end of the clamping arm through a hinge shaft, the edge line of the inner surface of the clamping piece on the section formed by cutting the capturing clamping piece in the width direction and the thickness direction is parallel to the circumferential line of the far-end inner pipe section, and the extending direction of the hinge shaft is parallel to the tangent line of the circumferential line of the far-end inner pipe section.
Still alternatively, each group of jaw arms further includes a clip spring, a spring mounting portion is further provided on an outer surface of the clip, one end of the clip spring is connected to the spring mounting portion, the other end of the clip spring is connected to the gripping arm, the clip spring is configured to enable the capturing clip to always have a movement tendency of rotating to an initial state about the hinge shaft relative to the gripping arm, in the initial state, the clip body is located at a side of the gripping arm facing an axis of the distal inner pipe section, and an inclined surface of the clip inner surface is located at an outer side of the proximal end.
Alternatively, the edges of the outer surface of the clip and the inner surface of the clip on the cross section of the clip body cut in the width direction and the thickness direction are parallel to each other.
In an alternative technical scheme of the embodiment of the invention, the outer tube assembly further comprises a middle tube, a middle tube knob and a screw-in and screw-out transmission assembly;
The middle tube knob is arranged on the outer tube handle in a way of being coaxial with the outer tube handle, axially limited on the outer tube handle and capable of rotating relative to the outer tube handle in a circumferential direction; the screw-in screw-out transmission assembly is arranged in the outer tube handle, the middle tube passes through the outer tube, and the proximal end of the middle tube is connected with the middle tube knob through the screw-in screw-out transmission assembly; the rotary knob of the middle tube is rotated relative to the handle of the outer tube, and the rotary knob of the middle tube can drive the rotary transmission assembly to drive the middle tube to axially slide while rotating circumferentially relative to the outer tube, so that the cutter can be screwed out of the outer tube towards the distal direction or is retracted back towards the proximal direction;
the inner tube passes through the middle tube, and the inner tube handle and the outer tube handle can axially and relatively slide so that the at least three groups of claw arms extend out of or retract into the distal end of the middle tube.
Further alternatively, the cutter comprises a proximal section, an inclined section and a distal section which are sequentially connected from the proximal end of the middle tube to the distal end, wherein the inclined section gradually inclines outwards along the radial direction of the distal section from the proximal end to the distal end, and the distal cutting edge and the side cutting edge are arranged in the distal area of the distal section.
Optionally, the precession-rotation-withdrawal type transmission assembly comprises a proximal limit tube, a distal limit tube and a rotary sleeve;
One end of the proximal limiting tube is integrally connected or fixedly connected or axially and circumferentially limited and connected to the middle tube knob, and the other end of the proximal limiting tube is axially limited and circumferentially rotatably arranged in the outer tube handle;
The distal end of the distal end limiting tube is fixedly or integrally connected with the proximal end of the middle tube, and at least part of the distal end limiting tube axially slides through the proximal end limiting tube;
The rotary sleeve is axially limited and circumferentially rotatably arranged in the outer tube handle, the rotary sleeve is sleeved outside the proximal limiting tube, a spiral groove which circumferentially rotates around the rotary sleeve and spirally extends from one end of the rotary sleeve to the other end of the rotary sleeve is formed in the peripheral wall of the rotary sleeve, and the spiral groove penetrates through the rotary sleeve along the radial direction of the rotary sleeve;
The limiting bulge of the distal limiting tube passes through the axial sliding groove of the proximal limiting tube and the spiral groove of the rotating sleeve;
the middle tube knob is rotated relative to the outer tube handle, the proximal end limiting tube can be driven to rotate, the limiting protrusion is driven to axially slide along the spiral groove while rotating, and accordingly the middle tube is driven to do precession type or precession type movement relative to the outer tube handle and the outer tube.
The embodiment of the invention at least has the following beneficial effects:
The implant capturing and taking-out device provided by the embodiment of the invention is simple to operate, and at least three groups of claw arms are arranged to be matched with the claw handles and the push-pull mechanism to capture the implant in a grabbing manner, so that the implant capturing and taking-out device is not limited by the shape and the specification of the implant, the implant is not easy to fall off in the taking-out process, different types of implants can be quickly positioned and taken out from a patient, the operation efficiency is improved, and the operation reliability is high.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
FIG. 1 is an isometric view of the overall structure of an implant capture extraction device according to an embodiment of the present invention;
FIG. 2 is an enlarged view of a partial structure of the area A in FIG. 1;
FIG. 3 is a partial cross-sectional view of region A of FIG. 1;
FIG. 4 is an enlarged view of a portion of the structure of the area B in FIG. 1;
FIG. 5 is an isometric view of a structure with a jaw arm at the distal end of an inner tube in an implant capture extraction device according to an embodiment of the present invention;
FIG. 6 is a schematic illustration of an axial structure of a capture clip in an implant capture extraction device according to an embodiment of the present invention;
FIG. 7 is an axial cross-sectional view of the overall structure of an implant capture extraction device provided in an embodiment of the present invention;
FIG. 8 is an enlarged view of a portion of the structure of region C of FIG. 7;
Fig. 9 is an enlarged view of a partial structure of the region D in fig. 7.
The icons are 11-outer tube handle, 111-middle tube knob, 12-outer tube, 13-middle tube, 131-cutter, 1311-proximal section, 1312-inclined section, 1313-distal section, 13101-distal blade, 13102-side blade;
21-inner tube handles, 211-jaw handles, 22-inner tubes, 221-main body inner tube sections, 222-far end inner tube sections, 223-tube seats, 23-jaw arms, 231-fixed arms, 232-hinged arms, 233-clamping arms, 24-clamping clips, 241-clip bodies, 2401-clip inner surfaces, 2402-clip outer surfaces, 242-mounting blocks, X-length directions, Y-width directions, Z-thickness directions, 243-spring mounting parts and 25-clip springs;
31-a central hinge block, 311-a connecting convex part, 32-a push-pull piece, 321-a stop block, 33-a return spring, 34-a transmission rod and 341-a circumferential limit bulge;
4-screw-in and screw-out type transmission components, 41-proximal limit pipes, 411-axial sliding grooves, 42-distal limit pipes, 421-limit protrusions, 43-rotating sleeves and 431-spiral grooves;
5-bending adjusting handle, 51-bending adjusting knob, 52-bending adjusting screw, 53-bending adjusting slide block and 531-slide block bulge.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that like reference numerals and letters refer to like items in the drawings, and thus once an item is defined in one drawing, no further definition or explanation thereof is necessary in subsequent drawings.
In describing the present invention, it should be noted that:
Unless specifically stated or limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected, or may be directly connected, or may be indirectly connected through intervening media, or may be in communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
The terms "proximal," "distal," "circumferential," "axial," "radial," "inner," "outer," and the like refer to an orientation or positional relationship based on that shown in the drawings, or that is conventionally laid down in the use of the inventive product, merely for convenience in describing the invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the invention.
In the following, some embodiments of the present invention will be described in detail with reference to the accompanying drawings, wherein the end of the medical device close to the operator during operation is the proximal end of the medical device, the end of the medical device entering the blood vessel of the patient is the distal end of the medical device (the front end of the medical device is the distal end, and the rear end of the medical device is the proximal end). The following examples and features of the various alternative implementations of the examples may be combined with one another without conflict.
The present embodiment provides an implant capture extraction device, referring to fig. 1-9, that includes an outer tube assembly and an inner tube assembly. Wherein the outer tube assembly comprises at least an outer tube handle 11 and an outer tube 12 having a proximal end fixedly connected to the interior of the outer tube handle 11. The inner tube assembly at least comprises an inner tube 22, an inner tube handle 21, a claw handle 211 and a push-pull mechanism, wherein the proximal end of the inner tube 22 is fixedly connected with the inner tube handle 21, at least three groups of claw arms 23 are hinged at the distal end of the inner tube 22, the claw arms 23 are arranged at intervals along the circumferential direction of the inner tube 22, for example and without limitation, as shown in fig. 1, 4, 5, 7 and 9, four groups of claw arms 23 are arranged at intervals along the circumferential direction of the inner tube 22, the claw handle 211 is movably arranged on the inner tube handle 21, one end of the push-pull mechanism is in transmission connection with each group of claw arms 23, the other end of the push-pull mechanism is connected with the claw handle 211, the claw handle 211 can be driven to control the distal ends of the claw arms 23 to open or close inwards along the radial direction of the inner tube 22, and the claw handle 211 can be locked on the inner tube handle 21 to lock the open and close states of the claw arms 23. The inner tube 22 passes through the outer tube 12, the inner tube handle 21 is provided on the proximal end side of the outer tube handle 11, and the inner tube handle 21 is axially slidable relative to the outer tube handle 11 so that the claw arms 23 extend or retract into the distal end of the outer tube 12.
When an implant is removed from a patient using an implantation intervention, the implant has not yet been severely endothelialized with or separated from the organ tissue of the patient:
The distal end of the outer tube 12 and the distal end of the inner tube 22 of this embodiment are fed along the guide wire to the end of the implant, the outer tube handle 11 is withdrawn in the proximal direction relative to the inner tube handle 21 to withdraw the outer tube 12 relative to the inner tube 22 (or the inner tube handle 21 is pushed forward in the distal direction relative to the outer tube handle 11 to push the inner tube 22 forward relative to the outer tube 12) such that the jaw arms 23 of the distal end (front end) of the inner tube 22 are exposed to the distal end (front end) of the outer tube 12, then the jaw handle 211 is moved relative to the inner tube handle 21, the push-pull mechanism is driven to control the distal ends of the jaw arms 23 to open radially outward and close inward of the inner tube 22 such that the jaw arms 23 grip the end of the implant, after which the jaw handle 211 is locked to the inner tube handle 21, the outer tube handle 11 is pushed forward relative to the inner tube handle 21 in the distal direction to push the outer tube 12 forward relative to the inner tube handle 11 (or the inner tube handle 21 is pushed rearward relative to withdraw the inner tube handle 21 relative to the outer tube 12) such that at least the gripped end of the jaw arms 23 and the implant are received inside the outer tube 12, and the implant extraction device is withdrawn from the patient.
The implant capturing and taking out device provided by the embodiment is simple to operate, and the implant is captured in a capturing manner by arranging at least three groups of claw arms 23 and matching with the claw handles 211 and the push-pull mechanism, so that the implant is not limited by the shape and the specification of the implant, the implant is not easy to fall off in the taking out process, different types of implants can be rapidly positioned and taken out from the body of a patient, the operation efficiency is improved, and the operation reliability is high.
With continued reference to fig. 1-9, in an alternative embodiment of the present example, the inner tube 22 comprises a main body inner tube section 221 and a distal inner tube section 222 fixedly or integrally connected, the push-pull mechanism comprises a central hinge block 31 and a push-pull member 32, the central hinge block 31 being suspended on the distal side of the distal inner tube section 222, and the jaw arms 23 being circumferentially arranged around the central hinge block 31. Each group of claw arms 23 comprises a respective fixing arm 231, an articulated arm 232 and a clamping arm 233, wherein one side of each clamping arm 233 facing the axis of the distal inner pipe section 222 is taken as the respective inner side, one side of each clamping arm 233 facing away from the axis of the distal inner pipe section 222 is taken as the respective outer side, each clamping arm 233 is in a bending shape protruding from the respective inner side to the respective outer side, the proximal end of the fixing arm 231 is fixedly connected to the distal end surface edge area of the distal inner pipe section 222, the proximal end of the articulated arm 232 is articulated with the distal end of the fixing arm 231, the distal end of the clamping arm 233 is suspended, the proximal end of the clamping arm 233 is articulated with the distal end of the articulated arm 232 by a connecting convex part 311 arranged on the outer wall of the central articulated block 31, the proximal end of the clamping arm 233 passes through the inner pipe 22, the distal end of the push-pull piece 32 is fixedly connected to the central articulated block 31, and the proximal end of the push-pull piece 32 is fixedly or in transmission connection with the claw handle 211. The movable jaw handle 211 relative to the inner tube handle 21 is capable of pulling the push-pull member 32 in a proximal direction relative to the inner tube 22 under a first condition such that the distal ends of the gripping arms 233 of the jaw arms 23 are closed radially inwardly of the distal inner tube segment 222, and pushing the push-pull member 32 in a distal direction relative to the inner tube 22 such that the distal ends of the gripping arms 233 of the jaw arms 23 are opened radially outwardly of the distal inner tube segment 222 under a second condition.
In the above-described structure, an alternative structure of the claw arm 23 in the present embodiment is exemplified, in which the claw arm 23 includes the fixing arm 231, the hinge arm 232 and the gripping arm 233, the opening and closing of the plurality of claw arms 23 are controlled by the central hinge block 31 hinged with the gripping arm 233, and the gripping arm 233 is made to have a curved shape protruding from the inner side to the outer side, so that when the claw arms 23 are closed, the end portion of the implant can be gathered in the "drum-shaped" space formed by surrounding the plurality of gripping arms 233, on the one hand, a larger implant end portion accommodating space is provided to accommodate implants of different shape and size, on the other hand, the component force applied to the end portion of the implant by the distal end of each gripping arm 233 in the radial direction of the implant after the closing of the claw arm 23 is increased, and the reliability of gripping the implant is greatly improved.
In this embodiment, for the push-pull member 32, a hard rod structure or a relatively soft wire structure is used, for example, with continued reference to fig. 1 to 9, in some alternative implementations of this embodiment, the push-pull member 32 is a push-pull wire, the push-pull mechanism further includes a return spring 33 in addition to the central hinge block 31 and the push-pull member 32, the inner tube 22 further includes a tube seat 223, the distal end of the main inner tube section 221 is connected to the proximal end of the tube seat 223, the proximal end of the distal inner tube section 222 is connected to the distal end of the tube seat 223, an axial through hole is formed inside the tube seat 223, an end plate is fixedly or integrally connected to the distal end surface of the distal inner tube section 222, an end plate through hole is formed in the middle of the end plate, and the push-pull wire sequentially passes through the axial through hole of the main inner tube section 221, the tube seat 223 and the end plate through hole of the distal inner tube section 222, and the push-pull wire is located inside the distal inner tube section 222 and is fixedly connected to the stopper 321 near the end plate. The return spring 33 is disposed inside the distal inner tube segment 222 and between the tube seat 223 and the stop 321, the return spring 33 is configured to always have a movement tendency to push the stop 321 in a distal direction relative to the distal inner tube segment 222 so that the distal ends of the gripping arms 233 of the jaw arms 23 open radially outwardly of the distal inner tube segment 222, and to pull the push-pull wire in a proximal direction relative to the inner tube 22 so as to drive the stop 321 to compress the return spring 33 in a proximal direction so that the distal ends of the gripping arms 233 of the jaw arms 23 close radially inwardly of the distal inner tube segment 222.
For the specific structural form of the jaw handle 211, including but not limited to, the jaw handle 211 is axially slidably mounted on the inner tube handle 21 (the jaw handle 211 is pushed forward or pulled backward by pushing the push-pull member 32 forward or pulled backward), or in some optional implementations of this embodiment, the jaw handle 211 is a knob handle, the axial direction of the inner tube 22 is the axial direction of the inner tube handle 21, the jaw handle 211 is coaxial with the inner tube handle 21 and axially limited on the inner tube handle 21 and can rotate circumferentially relative to the inner tube handle 21, the push-pull member 32 is a push-pull wire or push-pull rod, the push-pull mechanism further includes a transmission rod 34 which is circumferentially limited and axially slidably mounted inside the inner tube handle 21 (the specific mounting mode includes, but is not limited to, a sliding groove extending axially is formed in the inner wall of the inner tube handle 21, a circumferential limiting protrusion 341 is formed in the outer peripheral wall of the transmission rod 34), the jaw handle 211 is sleeved outside the transmission rod 34 and is in threaded connection with the transmission rod 34, the proximal end of the push-pull member 32 is fixedly connected to the transmission rod 34, and when the inner tube handle 21 rotates relative to the inner tube handle 21, the jaw handle 211 is axially limited by the transmission rod 21 and is axially limited by the transmission rod 34, and the forward or pull member can be axially limited by the transmission rod 21.
In addition, in order to further enhance the pressure applied to the implant in the radial direction when the plurality of jaw arms 23 are closed, thereby further enhancing the grasping reliability of the implant, in some alternative implementations of the present embodiment, as shown in fig. 1,4, 5, 6, 7 and 9, each set of jaw arms 23 further includes a grasping jaw 24, respectively, the grasping jaw 24 includes a jaw body 241 and a mounting block 242, the jaw body 241 has a length direction X, a width direction Y and a thickness direction Z, with opposite side surfaces in the thickness direction Z of the jaw body 241 being a jaw inner surface 2401 and a jaw outer surface 2402, respectively, at least edges of the jaw inner surface 2401 in a cross section of the jaw body 241 cut in the width direction Y and the thickness direction Z being an arc with a middle portion protruding toward the jaw outer surface 2402, edges of the jaw outer surface 2402 in a cross section of the jaw body 241 cut in the width direction Y and the thickness direction Z being not particularly limited, but for ease of manufacture, and reducing the radial dimension of the distal side structure of the inner tube 22 during the endovascular delivery, preferably such that the jaws inner surface 241 and the jaws inner surface 2401 are cut in the width direction Y and the cross section 2401 parallel to each other. The mounting block 242 is fixedly or integrally connected to the outer surface 2402 of the clip, and the mounting block 242 is rotatably mounted on the distal end of the gripping arm 233 by a hinge shaft, wherein an edge line of the inner surface 2401 of the clip on a cross section of the capturing clip 24 cut along the width direction Y and the thickness direction Z is parallel to a circumferential line of the distal inner pipe section 222, and an extending direction of the hinge shaft is parallel to a tangent line of the circumferential line of the distal inner pipe section 222.
In this structure, through the distal end articulated clamping piece 24 that catches arm 233, can utilize the clamping piece 24 self-adaptation centre gripping in the global of implant, increase the clamping arm 233 press from both sides the area of contact between the peripheral face of implant when getting the implant tip, increase two frictional forces to further anti-drop, in addition, the curved surface design of clamping piece 24's clamping piece internal surface 2401, the implant that holds that can be better reaches more reliable and more stable clamping effect.
In order to further improve the gripping efficiency, in the above embodiment with the capturing clip 24, further optionally, each set of the jaw arms 23 further includes a clip spring 25, the clip outer surface 2402 is further provided with a spring mounting portion 243, one end of the clip spring 25 is connected to the spring mounting portion 243, the other end is connected to the capturing arm 233, and the clip spring 25 is configured such that the capturing clip 24 always has a movement tendency of rotating around the hinge shaft relative to the capturing arm 233 to an initial state, in the initial state, the clip body 241 is located on a side of the capturing arm 233 facing the axis of the distal inner tube section 222, and the clip inner surface 2401 is an inclined surface with a distal end located on an outer side of the proximal end, which can be used as a guiding surface during capturing, so as to rapidly pick up the implant.
In addition, aiming at the problem that endothelialization is often generated between the implant and organ tissues of a patient after the implant is implanted into the patient for a period of time in the prior art, when the implant is taken out in an implantation intervention mode, the implant pulls the organ tissues of the patient, the problem that the taking out difficulty is high and the wound to the patient is large is solved, and the following further improvement is made in the embodiment:
With continued reference to fig. 1-9, in some alternative implementations of the present embodiment, the outer tube assembly further includes a middle tube 13, a middle tube knob 111, and a screw-in and screw-out drive assembly 4. The middle tube knob 111 is mounted to the outer tube handle 11 coaxially with the outer tube handle 11, axially restrained to the outer tube handle 11, and rotatable circumferentially relative to the outer tube handle 11, with the outer tube 12 being axially of the outer tube handle 11. The screw-in and screw-out transmission assembly 4 is arranged inside the outer tube handle 11, the middle tube 13 passes through the outer tube 12, the proximal end of the middle tube 13 is connected with the middle tube knob 111 through the screw-in and screw-out transmission assembly 4, at least one cutting groove which radially penetrates through the wall of the middle tube 13 is arranged on the distal end face of the middle tube 13, the rest part of the distal end of the middle tube 13 except the cutting groove forms a cutter 131, and each cutter 131 is provided with a distal cutting edge 13101 and a side cutting edge 13102 respectively. The rotation of the middle tube knob 111 relative to the outer tube handle 11 can drive the screw-in and screw-out transmission assembly 4 to rotate circumferentially and simultaneously slide axially relative to the outer tube 12 with the middle tube 13 so that the cutter 131 screws out of the outer tube 12 in the distal direction or screws back into the outer tube 12 in the proximal direction. The inner tube 22 passes through the middle tube 13 and the inner tube handle 21 is axially slidable relative to the outer tube handle 11 to extend or retract the jaw arms 23 from the distal end of the middle tube 13.
When the device is used, for an implant which has endothelialized with organ tissues of a patient, the cutter 131 can be screwed into the outer tube 12 towards the distal direction so as to separate the implant from surrounding human tissues by rotary cutting through the cutter 131, then the cutter 131 is screwed back into the middle tube 13 towards the proximal direction, and then the claw arm 23 at the distal end of the inner tube 22 is used for capturing the implant, so that the problem can be solved.
In this alternative embodiment, further alternatively, the cutter 131 includes a proximal section 1311, an inclined section 1312, and a distal section 1313 sequentially connected by the proximal end of the middle tube 13 in the distal direction, the inclined section 1312 gradually inclining radially outwardly of the distal section 1313 from the proximal end to the distal end direction to avoid the click-on arms 23, and the distal blade 13101 and the side blade 13102 are provided in the distal region of the distal section 1313.
For the specific arrangement of the above-mentioned screw-and-spin-back type transmission assembly 4, for example, but not limited to, a combined structure of a screw and a slider or other structures are adopted, wherein, optionally, as shown in fig. 3, in order to improve the stability of the transmission, the screw-and-spin-back type transmission assembly 4 includes a proximal end limiting tube 41, a distal end limiting tube 42 and a rotating sleeve 43, one end of the proximal end limiting tube 41 is integrally connected or fixedly connected or axially and circumferentially limited to the middle tube knob 111, the other end of the proximal end limiting tube 41 is axially limited and circumferentially rotatably mounted inside the outer tube handle 11, and an axial sliding slot 411 extending axially and penetrating the proximal end limiting tube 41 radially is arranged on a tube wall of the proximal end limiting tube 41 located inside the outer tube handle 11. The distal end of the distal end limiting tube 42 is fixedly or integrally connected to the proximal end of the middle tube 13, at least part of the distal end limiting tube 42 axially slidably penetrates through the proximal end limiting tube 41, and a limiting protrusion 421 is fixedly or integrally connected to the outer tube 12 wall of the distal end limiting tube 42. The rotary sleeve 43 is axially limited and circumferentially rotatably mounted inside the outer tube handle 11, and the rotary sleeve 43 is sleeved outside the proximal limit tube 41, a spiral groove 431 which circumferentially rotates around the rotary sleeve 43 and extends spirally from one end of the rotary sleeve 43 to the other end is provided on the peripheral wall of the rotary sleeve 43, and the spiral groove 431 penetrates the rotary sleeve 43 in the radial direction of the rotary sleeve 43. The limit projection 421 of the distal limit tube 42 passes through the axial slide slot 411 of the proximal limit tube 41 and the spiral slot 431 of the rotation sleeve 43. The rotation of the middle tube knob 111 relative to the outer tube handle 11 can drive the proximal stop tube 41 to rotate, with the stop tab 421 rotating along the helical groove 431 while sliding axially, thereby driving the middle tube 13 to move in a precession or a precession relative to the outer tube handle 11 and the outer tube 12.
In addition, in order to better adapt to the bending state of the blood vessel, avoid the problem that the device is not easy to pass through the blood vessel of the patient when the bending sheath tube is additionally used, and further simplify the operation steps, in some alternative implementations of the present embodiment, a bending assembly may be further provided on the outer tube handle 11 and the inner tube handle 21, respectively, where the bending assembly includes a bending handle 5 connected to the respective handles, a bending knob 51 coaxially and rotatably mounted on the bending handle 5, a bending screw 52 provided inside the bending handle 5 and fixedly connected to the bending knob 51, a bending slider 53 provided inside the bending handle 5 and screwed on the outside of the bending screw 52, and a bending wire having one end connected to the bending slider 53 and the other end connected to the outer tube 12 or the distal end side of the inner tube 22, a slider protrusion 531 provided on the outer circumferential surface of the bending slider 53, and a sliding rail extending along the axial direction of the bending screw 52 provided on the inner circumferential surface of the bending slider 53, where the slider protrusion 531 is engaged with the sliding rail, and the bending screw 52 is rotated relative to the bending handle 5, so that the bending slider 53 is released or pulled by the bending screw 52 along the axial direction of the bending screw 52, thereby pulling or pulling the distal end of the outer tube 22.
It should be noted that the above embodiments and the optional embodiments thereof in the present specification are only for illustrating the technical solution of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that the technical solution described in the foregoing optional embodiments may be modified or some or all of the technical features may be equivalently replaced, and these modifications or substitutions do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the present invention, and in addition, it is emphasized again that the features of the embodiments and the optional embodiments in the present specification may be mutually combined without conflict.