CN211934231U

CN211934231U - Lead extraction device

Info

Publication number: CN211934231U
Application number: CN201922487809.2U
Authority: CN
Inventors: 唐闽; 王永胜; 高国庆; 梁良军
Original assignee: Hangzhou Nuomao Medtech Co ltd
Current assignee: Hangzhou Dinova EP Technology Co Ltd
Priority date: 2019-12-30
Filing date: 2019-12-30
Publication date: 2020-11-17
Anticipated expiration: 2029-12-30

Abstract

The utility model provides an extraction device, which is used for extracting a slender structure implanted in a body, and comprises an operation handle, a sheath tube connected with the far end of the operation handle, and an expansion head connected with the far end of the sheath tube, wherein the operation handle comprises a driving piece and a rotating piece, one end of the rotating piece is connected with the near end of the sheath tube, the other end of the rotating piece is connected with the driving piece, and the driving piece is used for driving the rotating piece to rotate in two directions so as to drive the sheath tube and the expansion head to rotate in two directions; not only can the expansion head effectively cut the fiber tissue wrapped around the slender structure, but also can prevent other leads in the blood vessel from being intertwined and prevent the blood vessel wall from being twisted and scratched by the expansion head.

Description

Lead extraction device

Technical Field

The utility model relates to an intervene medical instrument technical field, especially relate to a wire remove device for taking out implant electrode wire in patient's body for a long time.

Background

Various medical treatment and surgical methods require the implantation of elongated structures within the body of a human or veterinary patient. Such elongated structures may include catheters, sheaths, cardiac electrical leads (e.g., pacemaker or defibrillator leads), and a variety of other devices. Wherein the cardiac pacemaker is typically implanted within a subcutaneous tissue pocket within a chest wall of a patient, a plurality of leads of the cardiac pacemaker extending from the pacemaker through veins into a chamber of the patient's heart; the defibrillator leads may be fixed inside or outside the heart.

In some cases, it may be desirable to remove a lead implanted in the patient's body, such as by breaking the lead implanted in the patient and failing to transmit a signal, by forming a large amount of fibrous (or calcified) tissue at the electrode tip that may cause the pacemaker to fail to provide sufficient energy to operate, by infection at the lead site, by clotting or scar tissue that may block the vein, or by other malfunction. Because the long and thin structure is implanted in the patient for a long time, a plurality of fibrous (or calcified) tissues can be attached to the wires, so that the wires can not be directly taken out between a plurality of wires, between the wires and the vessel wall or between the wires and the inner wall of the heart, and the problems of wire breakage, damage to the wires on the periphery and damage to the vessel wall or the inner wall of the heart can be caused when the wires are forcibly taken out. Currently, wire retrieval techniques are accomplished using wire retrieval devices that typically cut the fibrous tissue by a unidirectional rotational motion of a cutting tip along a wire.

However, in order to peel off fibrous tissue growing around a wire, one or more cuts of the cutting tip may be required to be completed, and in the case where the fibrous tissue is not completely separated from the wire, the fibrous tissue is easily caught and wound around the cutting tip by the continuous rotational cutting of the cutting tip in the original direction, and is seriously wound several times. In this case, the stretching of the blood vessel by the fibrous tissue may cause the blood vessel to be twisted and scratched by the dilating head; if a plurality of wires wrapped by fibrous tissues exist in the same blood vessel, other wires are easy to be wound together with the wire due to the traction of the fibrous tissues, so that the difficulty of taking out the electrode wire is greatly increased.

SUMMERY OF THE UTILITY MODEL

The utility model provides an extraction device for take out and implant at internal long and thin structure, extraction device including control the handle, connect in control the sheath pipe of handle distal end, and connect in the expansion head of sheath pipe distal end, wherein, control the handle and include the driving piece and rotate the piece, the one end of rotating the piece is connected the near-end of sheath pipe, the other end of rotating the piece is connected the driving piece, the driving piece is used for the drive rotate piece both-way rotation, in order to drive the sheath pipe reaches expansion head both-way rotation.

Preferably, the driving part comprises a worm, a bidirectional spiral groove is formed in the outer peripheral surface of the worm, and two ends of the bidirectional spiral groove respectively extend in opposite directions in a spiral manner; the rotating part comprises a worm wheel assembly, a through hole for penetrating the worm is formed in the worm wheel assembly, and a guide sliding pin inserted into the bidirectional spiral groove is further arranged on the surface of the worm wheel assembly; in the process that the worm moves along the axial direction, the guide sliding pin slides in the bidirectional spiral groove, and two ends of the bidirectional spiral groove drive the worm wheel assembly to rotate along opposite directions through the guide sliding pin respectively.

Preferably, the guide-slide pin is used for driving the worm gear assembly to rotate in two opposite directions during the process of sliding from the proximal end to the distal end of the bidirectional spiral groove or from the distal end to the proximal end of the bidirectional spiral groove.

Preferably, the bidirectional spiral groove includes a first guide groove disposed on an outer circumferential surface of the worm and a second guide groove communicating with a proximal end of the first guide groove, the first guide groove extends spirally along a first direction, the second guide groove extends spirally along a second direction, and a direction in which the first direction and the second direction extend spirally is opposite to each other.

Preferably, the bidirectional spiral groove includes a steering switching portion connected between the first guide groove and the second guide groove, and the worm drives the worm wheel assembly to rotate in an opposite direction after the guide slide pin passes over the steering switching portion.

Preferably, the worm gear assembly includes: the surface of the rotating wheel is provided with the guide sliding pin; the connecting cylinder is buckled at the edge of the rotating wheel, and the connecting cylinder and the rotating wheel are both provided with the through holes for penetrating the worm in the axial direction; under the drive of the worm, the rotating wheel rotates along two opposite directions, and the connecting cylinder moves synchronously along with the rotating wheel.

Preferably, the connecting cylinder and the rotating wheel are mutually clamped and fixed.

Preferably, the sheath pipe includes sheath pipe joint and interior sheath pipe, the both ends of interior sheath pipe are connected respectively expand the head with the sheath pipe joint, the near-end of sheath pipe joint with worm wheel assembly is connected.

Preferably, the sheath pipe joint is fixedly connected with the connecting cylinder of the worm gear assembly.

Preferably, the proximal end of the sheath connector is nested with the distal end of the connector barrel.

Preferably, the through holes are arranged at the corresponding positions of the proximal end and the distal end of the connecting cylinder; the near-end cover that the sheath pipe connects is located inside the distal end of connecting cylinder, the distal end that the sheath pipe connects passes the through-hole of connecting cylinder distal end extends to the outside of connecting cylinder.

Preferably, a first engaging portion protruding toward the proximal end of the sheath joint is formed at the distal end of the connecting cylinder, a second engaging portion protruding toward the first engaging portion is provided at the proximal end of the sheath joint, and the sheath joint moves synchronously with the connecting cylinder when the first engaging portion and the second engaging portion are engaged with each other.

Preferably, the first engaging portion includes a first rack provided on the connecting cylinder, and the second engaging portion includes a second rack provided on the sheath joint, the first rack being disengageably engaged with the second rack.

Preferably, the sheath joint is fixed in position in the axial direction; when the worm moves along the axial proximal end, the rotating wheel drives the connecting cylinder to move proximally relative to the sheath pipe joint along with the worm, so that the first meshing part and the second meshing part are meshed with each other; when the worm moves along the axial far end, the rotating wheel drives the connecting cylinder to follow the worm to move towards the far end relative to the sheath pipe joint, so that the first meshing part and the second meshing part which are meshed with each other are gradually separated.

Preferably, after the first meshing part and the second meshing part are disengaged from each other, the worm wheel assembly continues to rotate under the driving of the axial movement of the worm.

Preferably, the first and second engagement portions are mutually engaged when the worm moves from the proximal end to the most distal end in its axial range of motion.

Preferably, the rotating wheel comprises a rotating ring and a first elastic member arranged at the far end of the rotating ring, and two ends of the first elastic member are respectively and elastically abutted against the far end of the rotating ring and the near end of the sheath pipe joint along the axial direction, so that the first meshing part and the second meshing part are ensured to be meshed with each other in the process of moving the worm to the near end and when the worm moves to the farthest end in the axial movement range.

Preferably, the control handle is further provided with a second elastic piece which moves synchronously with the worm at the proximal end of the control handle;

when the worm moves towards the near end, the second elastic piece is compressed and generates elastic deformation, and the elastic restoring force generated by the rebound of the compressed second elastic piece is used for pushing the worm to move towards the far end; first elastic component is to the thrust of the directional near-end that the swiveling wheel was applyed is first thrust, the second elastic component passes through the worm is right the thrust of the directional far-end that the swiveling wheel was applyed is the second thrust the in-process that the second elastic component kick-backed, works as first thrust is greater than behind the second thrust, first elastic component promotes the swiveling wheel for sheath pipe head is to the proximal motion, makes first meshing portion with second meshing portion intermeshing.

Preferably, the operating handle further comprises an operating member connected between the worm and the second elastic member, the operating member is configured to receive an external pulling force to drive the worm to slide axially and proximally and compress the second elastic member, and after the external pulling force disappears, the second elastic member rebounds and generates an elastic restoring force for pushing the operating member and the worm to move distally.

Preferably, the manipulation handle further comprises a housing provided with a limiting portion extending toward the axis of the withdrawing device on an inner wall surface thereof, and the limiting portion is used for limiting a movement range of the sheath joint in the axial direction.

Preferably, the sheath pipe joint is provided with a limiting groove corresponding to the limiting part, the limiting part is used for being accommodated in the limiting groove, and the limiting part is used for limiting the radial and axial movement range of the sheath pipe joint.

Preferably, the inner wall of the housing is provided with an accommodating groove, the worm wheel assembly is used for being accommodated in the accommodating groove, two side walls of the accommodating groove are respectively provided with a first reinforcing rib and a second reinforcing rib which are arranged at intervals along the axial direction, the length of the worm wheel assembly in the axial direction is the length of the worm wheel, the engagement length of the first engagement portion and the second engagement portion in the axial direction is the engagement depth, and the axial dimension between the mutually adjacent surfaces of the first reinforcing rib and the second reinforcing rib is larger than the sum of the length of the worm wheel and the engagement depth.

Preferably, the driving member and the rotating member are disposed in the inner cavity of the housing, and the proximal end of the sheath adapter is inserted into the inner cavity of the housing from the distal end of the housing and then connected to the rotating member.

Preferably, the housing is provided with a guide groove penetrating to an inner cavity of the housing, and the guide groove extends along the axial direction;

the operating handle further comprises an operating member connected to the proximal end of the worm, the operating member comprising a first portion and a second portion extending from the first portion to at least one side, the first portion being received in the interior cavity of the housing, the second portion extending through the guide slot to the exterior of the housing, the operating member being slidable along the guide slot.

Preferably, the expansion head and the sheath tube are both provided with threading inner cavities for transmitting the elongated structure, the worm is provided with a threading channel along the axial direction, the shell is provided with a wire outlet hole corresponding to the opening of the threading channel, and the proximal end of the elongated structure sequentially extends out of the taking-out device through the threading inner cavity of the expansion head, the threading inner cavity of the sheath tube, the threading channel and the wire outlet hole.

Preferably, the distal opening of the threading channel opens onto a side wall of the worm, the housing further being provided with a guide extending from an edge of the exit hole into the distal opening of the threading channel, the elongated structure at the distal opening of the threading channel sliding out of the exit hole along the guide.

The control handle of the taking-out device of the utility model can drive the expansion head and the sheath tube to move in the blood vessel of the patient, and the control handle can control the driving piece to drive the rotating piece to rotate bidirectionally, and the bidirectional rotation of the rotating piece can drive the sheath tube and the expansion head to rotate bidirectionally; during the process that the proximal end of the slender structure sequentially passes through the expansion head and the sheath tube and passes out of the extraction device from the control handle to extend outside the body, the expansion head and the sheath tube are pushed towards the distal end in the blood vessel so as to cut fibrous tissues wrapped around the slender structure and separate the slender structure from the inner wall of the blood vessel. Because control the handle through the drive rotate the piece and can drive and drive sheath pipe and expansion head both-way rotation, expand the head again and rotate along the second direction after rotatory along first direction promptly, can not only make the first fibrous tissue of cutting parcel around long and thin structure effectively of expansion, can also reduce other wires intertwine in long and thin structure and the blood vessel, and the vascular wall is because the tractive distortion and the probability of being extended the first scratch.

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 for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a taking-out device according to an embodiment of the present invention.

Fig. 2 is a schematic sectional view of the removing device in fig. 1.

Fig. 3 is an exploded perspective view of the worm and worm gear assembly of fig. 2.

Fig. 4 is an enlarged schematic view of the worm of fig. 3.

Fig. 5 is an enlarged schematic view of the worm gear assembly and sheath adapter of fig. 3.

Fig. 6 is an assembled cross-sectional view of the worm gear assembly, worm and sheath fitting of fig. 3.

Fig. 7 is a partial sectional view of fig. 2.

Fig. 8 is a schematic diagram of a state of the reproduction apparatus in fig. 7.

Fig. 9 is a cross-sectional structural schematic view of another view of the takeout apparatus of fig. 1.

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 in the present invention, all other embodiments obtained by a person skilled 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 direction of the appended figures and, therefore, are used in order to better and more clearly illustrate and understand the present invention without indicating or implying that the device or element so 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. The term "connection of component A to component B" means that component A is directly connected in contact with component B or component A is indirectly connected to component B through another component.

To more clearly describe the structure of the retrieval device, the terms "proximal", "distal" and "axial" as used herein are used as terms commonly used in the interventional medical field. Specifically, "distal" refers to the end of the surgical procedure that is distal to the operator; "proximal" means the end near the operator during a surgical procedure; "axial" refers to the direction of the central axis of the device, and the radial direction is perpendicular to the central axis. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

Referring to fig. 1 and fig. 2, fig. 1 is a schematic structural diagram of a taking-out device 100 according to a first embodiment of the present invention; fig. 2 is a schematic cross-sectional view of the takeout apparatus 100 in fig. 1. The present invention provides an extraction device 100 for extracting elongated structures implanted in a body, which may be, but is not limited to, catheters, sheaths, cardiac pacemakers or defibrillator electrode leads, and a variety of other devices that have been implanted in a patient; while the present application is described with reference to an electrode lead 500 (shown in fig. 9), it is to be understood that the elongate structure may also be other tubular grafts described above for long term implantation into a patient.

The removing device 100 comprises a control handle 20, a sheath tube 50 connected to the distal end of the control handle 20, and an expansion head 80 connected to the distal end of the sheath tube 50; wherein, handle 20, sheath 50 and expansion head 80 are provided with the threading inner chamber 201 that is used for transmitting wire 500 along the axial of remove device 100, the utility model provides an in remove device 100, control handle 20 and can control sheath 50 and expansion head 80 both-way rotation. The distal end of the dilation head 80 has blades for cutting the fibrous tissue surrounding the lead 500 to cut through or otherwise break the obstacles encountered during removal of the lead 500. The bidirectional rotating sheath-finger tube 50 and the expansion head 80 rotate in a first direction and then in a second direction, wherein the first direction is opposite to the second direction. The first direction may be a clockwise or counterclockwise direction when viewed from the proximal end to the distal end of the extractor 100, and the second direction corresponds to a counterclockwise or clockwise direction.

To use the retrieval device 100, the physician inserts the proximal end of the electrode lead 500 inside the patient into the lumen of the expansion head 80. The physician grasps the manipulation handle 20 and pushes the manipulation handle 20 distally so that the sheath 50 and the dilation head 80 are gradually advanced along the electrode lead into the patient's blood vessel. When the resistance force for pushing the manipulation handle 20 to the distal end is large, it means that the dilating tip 80 collides with the tissue around the electrode lead 500, and the sheath 50 and the dilating tip 80 are controlled by the manipulation handle 20 to rotate in both directions, so that the sharp blade of the dilating tip 80 cuts the tissue around the electrode lead, and the separation of the lead from the tissue is realized, thereby facilitating the subsequent lead removing operation. The sheath 50 and the expansion head 80 rotate in both directions, which also reduces the possibility that the guide wire 500 and other guide wires in the blood vessel are twisted and the vessel wall is twisted and scratched by the expansion head 80.

Specifically, the control handle 20 includes a housing 21, a housing 211 for accommodating other components is disposed inside the housing 21, the control handle 20 further includes a driving member and a rotating member disposed in the housing 211, the rotating member is connected to a distal end of the driving member, the control handle 20 further includes an operating member 26 partially accommodated in the housing 211, the sheath tube 50 is partially accommodated at a distal end of the housing 211, wherein the operating member 26 is connected to a proximal end of the driving member and is configured to receive an external pulling force, and an end (proximal end) of the sheath tube 50 away from the expansion head 80 enters the housing 211 through a distal opening of the housing 21 and is connected to the rotating member. The operating member 26 is under external pulling force to drive the driving member to move axially and proximally, and the axial movement of the driving member drives the rotating member to rotate bidirectionally, so as to drive the sheath 50 and the expansion head 80 to rotate bidirectionally.

Referring to fig. 2 to 5, the driving member includes a worm 23, and the worm 23 is axially slidably disposed in the receiving cavity 211 of the housing 21. The proximal end of the worm 23 is fixedly connected to an operating member 26, and the operating member 26 moves in the axial direction to move the worm 23 in the axial direction. In the present embodiment, the worm 23 is fixedly connected to the operating member 26 by a pin. In other embodiments, the proximal end of the worm 23 and the operating member 26 may be fixed by a screw or a snap, so that the worm 23 and the operating member 26 are movably connected together.

The outer circumferential surface of the worm 23 is provided with a bidirectional spiral groove 231, and both ends of the bidirectional spiral groove 231 spirally extend in opposite directions, respectively. The worm 23 includes a rod 230, and the outer surface of the rod 230 is provided with a bidirectional spiral groove 231 and a connecting column 235. The two-way spiral groove 231 is used for driving the rotating member to rotate, the connecting column 235 is used for being fixedly connected to the operating member 26, and the two-way spiral groove 231 is arranged at the far end of the rod body 230 relative to the connecting column 235.

As shown in fig. 4, the bidirectional spiral groove 231 includes a first guide groove 232 extending spirally and provided at a distal end of the outer peripheral surface of the worm 23, and a second guide groove 233 extending spirally and communicating with a proximal end of the first guide groove 232, the first guide groove 232 extending spirally in a first direction, and the second guide groove 233 extending spirally in a second direction, the first direction being opposite to the second direction. In this embodiment, the first direction is clockwise and the second direction is counterclockwise when viewed from the proximal end to the distal end of the extractor device 100. In a modified embodiment, the first direction is a counterclockwise direction and the second direction is a clockwise direction.

Further, the bidirectional spiral groove 231 further includes a rotation direction switching portion 234, the rotation direction switching portion 234 is connected between the first guide groove 232 and the second guide groove 233, and the worm 23 drives the worm wheel assembly 25 to rotate in the opposite direction after the rotation wheel 251 passes over the rotation direction switching portion 234. The distal end of the first guide groove 232 extends to the distal end surface of the rod 230, that is, the first guide groove 232 forms an opening on the distal end surface of the rod 230, and the turning switching part 234 is a transition groove between the first guide groove 232 and the second guide groove 233, and preferably, the switching part 234 is a smooth transition groove.

As shown in fig. 3, the rotating member includes a worm wheel assembly 25, the worm wheel assembly 25 is formed with a through hole for penetrating the worm 23, and the surface of the worm wheel assembly 25 is further provided with a sliding guide pin 2510 for being inserted into the bidirectional spiral groove 231; during the axial movement of the worm 23, the sliding guide pin 2510 slides in the bidirectional spiral groove 231, and the two ends of the bidirectional spiral groove 231 drive the worm wheel assembly 25 to rotate in opposite directions through the sliding guide pin 2510. That is, the bidirectional spiral groove 231 is used for driving the worm wheel assembly 25 to rotate in two opposite directions during the process of sliding the sliding pin 2510 from the proximal end to the distal end of the bidirectional spiral groove 231 or from the distal end to the proximal end of the bidirectional spiral groove 231, that is, the bidirectional spiral groove 231 is used for driving the worm wheel assembly 25 to rotate in two opposite directions in time sharing or time sequence. The proximal end of sheath 50 is inserted into receiving cavity 211 from the distal end of housing 21 (fig. 1) and then connected to worm gear assembly 25, and sheath 50 rotates in the opposite direction with worm gear assembly 25.

The worm gear assembly 25 includes a rotating wheel 251 and a connecting cylinder 255, the rotating wheel 251 is connected to a proximal edge of the connecting cylinder 255, and in this embodiment, the rotating wheel 251 is connected to a proximal end of the inner cavity of the connecting cylinder 255. The rotating wheel 251 is sleeved on the rod body 230 of the worm 23 and is connected with the rod body 230 in a sliding manner, and the connecting cylinder 255 is sleeved on the rotating wheel 251. The proximal end of the sheath 80 fits within the distal end of the connector 255, and the distal end of the sheath 80 extends out of the distal end of the connector and extends to the distal end of the retrieval device 100.

Referring to fig. 4 and fig. 5, the rotating wheel 251 is annular, that is, a through hole is axially formed in the middle of the rotating wheel 251, and the rotating wheel 251 is sleeved on the worm 23 through the through hole. The rotating wheel 251 is provided with at least one sliding guide pin 2510 which is slidably inserted into the bidirectional spiral groove 231 inwards.

The bidirectional spiral groove 231 is used for driving the worm wheel assembly 25 to rotate in two opposite directions in time sharing during the process that the sliding pin 2510 slides from the proximal end to the distal end of the bidirectional spiral groove 231 and slides from the distal end to the proximal end of the bidirectional spiral groove 231.

A bi-directional helical groove 231 extends distally through the distal face of the worm 23. During the axial sliding of the worm 23, the sliding guide pin 2510 of the rotating wheel 251 slides in the bidirectional spiral groove 231, and specifically, the sliding guide pin 2510 can slide into the second guide groove 233 after sliding along the first guide groove 232 and passing over the steering switching portion 234; the rotating wheel 251 slides along the second guide groove 233 and then slides into the first guide groove 232 after passing over the steering switching portion 234, so as to drive the rotating wheel 251 and the connecting cylinder 255 to rotate bidirectionally, and the sheath 50 and the expansion head 80 rotate bidirectionally along with the connecting cylinder 255.

In other embodiments, slide guide pin 2510 may also be disposed at other locations on rotating wheel 251, such as the surface of rotating wheel 251 facing toward or away from sheath 50.

As shown in fig. 5, in the present embodiment, the number of the slide guide pins 2510 is 2 for force balance of the rotor 251, two slide guide pins 2510 are provided on the surface of the rotor 251 so as to face each other and extend into the through hole, and the two slide guide pins 2510 may be located at the same axial position of the rotor 251 or may be located at different axial positions. Two slide guide pins 2510 are slidably inserted into the bidirectional spiral groove 231 of the worm 23. Correspondingly, the surface of the rod body 230 is provided with two bidirectional spiral grooves 231, and each sliding guide pin 2510 is correspondingly accommodated in one bidirectional spiral groove 231; in embodiments where the two sliding guide pins 2510 are axially positioned differently, two sliding guide pins 2510 may be used to insert into the same bidirectional helical slot 231. In an alternative embodiment, a plurality of sliding guide pins 2510 and a plurality of bidirectional spiral grooves 231 may be further provided, and the number of sliding guide pins 2510 and the number of bidirectional spiral grooves 231 may be unequal. In the modified embodiment, the slide guide pin 2510 is formed in a hemispherical shape, or the slide guide pin 2510 is a spirally extending strip protruding from the inner surface of the rotor 251 in the direction of the through hole, and the slide guide pin 2510 is shaped to fit the bidirectional spiral groove 231 so as to be accommodated in the bidirectional spiral groove 231.

The edge of the rotating wheel 251 is fixedly or movably connected with the connecting cylinder 255, that is, the rotating wheel 251 is connected with the connecting cylinder 255 by clamping, bonding or the like. In this embodiment, the outer wall of the rotating wheel 251 is provided with a clamping hole 2512, and the clamping hole 2512 is used for clamping a clamping block 2554 on the connecting cylinder 255. As shown in fig. 2-3 and 5, the distal end of the connecting cylinder 255 is provided with a through hole for passing through the worm 23, and the connecting cylinder 255 rotates around the worm 23 under the driving of the rotating wheel 251. In other embodiments, where the connector 255 is long enough (the handle is long enough), the inner cavity of the connector 255 is configured to receive the shaft 230, and the shaft 230 need not fit over the connector 255.

The connecting tube 255 includes a tube 2551 covering the edge of the rotating wheel 251 and a first engaging portion disposed at a distal end of the tube 2551.

A plurality of clamping blocks 2554 are arranged at the proximal end of the barrel body 2551, and the plurality of clamping blocks 2554 are used for being clamped in the clamping holes 2512 of the rotating wheel 251, so that the rotating wheel 251 and the connecting barrel 255 are connected together.

The first engagement portion includes a connection ring 2553 protruded from an inner surface of the connection cylinder 255 and a first rack 2556 opened on the connection ring 2553. The connecting ring 2553 is annular or partially annular, and a through hole surrounded by the connecting ring 2553 is used for the worm wheel 23 to pass through. The first rack 2556 comprises a series of projections projecting towards the rotary wheel 251.

Referring to fig. 2 and 5, the sheath tube 50 includes a sheath connector 52 connected to the connecting cylinder 255 and an inner sheath tube 54 connected to a distal end of the sheath connector 52. The end of sheath fitting 52 facing away from inner sheath 54 is connected to connector 255.

In the present embodiment, as shown in fig. 2, the sheath joint 52 and the inner sheath 54 are fixed by screwing, specifically, the distal end of the sheath joint 52 is provided with an internal thread, the proximal end of the inner sheath 54 is provided with an external thread, and the internal thread and the external thread are fixed by a thread glue after being assembled in place, so that the sheath joint 52 and the inner sheath 54 are fixed together. The sheath connector 52 and the inner sheath 54 may be fixed by other methods, such as welding, etc.

As shown in fig. 3, the sheath connector 52 has a cylindrical structure and includes a tube 521 inserted into the connection ring 2553 and a second engaging portion protruding from the outer surface of the proximal end of the tube 521.

The second engagement portion includes a snap ring 523 and a second rack 5232 provided on the snap ring 523. A second rack 5232 is provided at the proximal end of the sheath fitting 52 and includes a series of projections that project toward the first rack 2556.

The first engaging portion is adapted to engage with the second engaging portion, and when the first engaging portion is engaged with the second engaging portion, the second engaging portion is engaged with the first rack 2556 of the first engaging portion via the second rack 5232, and the sheath coupling 52 can move synchronously with the rotating wheel 251 and the connecting cylinder 255. Specifically, the first rack 2556 and the second rack 5232 are adapted to be releasably engaged together, i.e., the projections of the first rack 2556 and the second rack 5232 are shaped to match each other and are aligned in the rear-end direction of the assembly.

Further, as shown in fig. 5, the rotating wheel 251 further includes a rotating ring 2511 and a first elastic element 2515 disposed at a distal end of the rotating ring 2511, the rotating ring 2511 is annular, and encloses a through hole for penetrating the worm 23 and is used for bearing the first elastic element 2515, two opposite ends of the first elastic element 2515 respectively axially and elastically abut against the distal end of the rotating ring 2511 and a proximal end of the sheath connector 52, and push the second engaging portion on the sheath connector 52 towards the first engaging portion on the connecting cylinder 255, so that the second engaging portion is engaged with the first engaging portion, and the sheath 50 rotates along with the connecting cylinder 255.

In this embodiment, the first elastic element 2515 comprises a spring and an abutting element for abutting against the sheath adapter 52, the rotating wheel 251 is provided with a connecting slot, the spring is accommodated in the connecting slot, the proximal end of the spring abuts against the bottom wall of the connecting slot, and the distal end of the spring abuts against the abutting element. Preferably, the first resilient member 2515 is a spring loaded plunger.

In this embodiment, for the force balance of the proximal end surface of the sheath 50, the number of the first elastic elements 2515 is 3, and the three first elastic elements 2515 are uniformly arranged along the circumferential direction of the rotating wheel 251, that is, an included angle between a connecting line between every two adjacent first elastic elements 2515 and the axial line of the rotating wheel 251 is 120 degrees.

Referring to fig. 2 and 7, the worm wheel assembly 25 and the sheath connector 52 are rotatably accommodated in the accommodating cavity 211 of the housing 21, except that the worm wheel assembly 25 can move back and forth in the axial direction, the sheath connector 52 is limited in the axial direction so as not to move back and forth, and thus the first engaging portion and the second engaging portion can be engaged with each other in a clutching manner, and when the first engaging portion and the second engaging portion are engaged with each other, the sheath connector 52 rotates synchronously with the worm wheel assembly 25. Specifically, the housing 21 is provided with an accommodating groove 212 for accommodating the worm wheel assembly 25, and is further provided with a second limiting portion 218 and a third limiting portion 219 for limiting the sheath joint 52.

The worm wheel assembly 25 is movably received in the receiving groove 212. The two side walls of the receiving groove 212 are respectively a first rib 214 and a second rib 215 which are arranged at intervals along the axial direction, the first rib 214 is closer to the proximal end than the second rib 215, and the bottom wall of the receiving groove 212 is the housing 21 between the first rib 214 and the second rib 215.

Further, the first rib 214 and the second rib 215 both extend along the circumferential direction of the receiving groove 212 and protrude toward the axis, and in the embodiment, the first rib 214 and the second rib 215 are both annular, but it is understood that the first rib 214 and the second rib 215 may also be polygonal, rectangular, etc. with a through hole at the middle. The receiving groove 212 defines a receiving space 216, and the worm wheel assembly 25 is configured to be received in the receiving space 216 between the first reinforcing rib 214 and the second reinforcing rib 215.

The axial dimension between the mutually adjacent surfaces of the first and second reinforcing

ribs

214 and 215 is larger than the sum of the length of the worm gear assembly 25 extending in the axial direction and the depth of engagement of the first and

second racks

2556 and 5232, so that the worm gear assembly 25 can move back and forth in the axial direction; the radial dimension of the receiving space 216 is slightly larger than that of the worm wheel assembly 25, and the receiving groove 212 is circular in cross section perpendicular to the axial direction (radial direction) so that the worm wheel assembly 25 can rotate about its axis within the receiving groove 212. In the present embodiment, the inner wall of the housing 21 between the first rib 214 and the second rib 215 is used to radially position the worm wheel assembly 25 so that the axial line of the worm wheel assembly 25 coincides with the axial line of the worm 23, and the worm 23, the worm wheel assembly 25, the sheath tube 50, and the expansion head 80 are coaxial with the taking-out device 100.

In a modified embodiment, the inner wall of the housing 21 is provided with a receiving groove along the circumferential direction thereof, the outer circumferential surface of the worm wheel assembly 25 is provided with a protruding ring which is movably received in the receiving groove, the length of the receiving groove extending along the axial direction of the housing 21 is greater than the length of the protruding ring extending along the axial direction of the housing 21, and the protruding ring can slide and rotate along the axial direction in the receiving groove.

In a modified embodiment, a protruding ring is disposed in the inner wall of the housing 21 along the circumferential direction thereof toward the receiving cavity 211, and an accommodating groove is formed in the outer circumferential surface of the worm wheel assembly 25 along the circumferential direction thereof, the protruding ring is movably accommodated in the accommodating groove, and the length of the accommodating groove extending along the axial direction of the housing 21 is greater than the length of the protruding ring extending along the axial direction of the housing 21, so that the protruding ring can slide and rotate in the accommodating groove along the axial direction.

As shown in fig. 2, the inner wall of the housing chamber 211 of the housing 21 is provided with a first stopper 217 for stopping the movement of the worm 23 in the radial direction. The first position-limiting portion 217 is disposed at a proximal end of the receiving cavity 212, and the first position-limiting portion 217 extends from an inner wall of the receiving cavity 211 to the receiving cavity 211. Specifically, the first position-limiting portion 217 is an annular plate disposed on the inner wall of the housing 21. The first limiting portion 217 forms a through hole along the axial direction, the worm 23 is inserted into the through hole of the first limiting portion 217 along the axial direction and then can slide along the axial direction, the axial line of the through hole coincides with the axial line of the worm 23, and the inner diameter of the through hole of the first limiting portion 217 is slightly larger than the outer diameter of the worm 23, so that the worm 23 is limited in the radial direction of the taking-out device 100.

The second stopper 218 is provided on the inner wall of the housing cavity 211 of the housing 21 and stops the sheath joint 52 in the radial direction of the extraction device 100. The second position-limiting portion 218 is disposed at a distal end of the receiving cavity 212, and the second position-limiting portion 218 is a ring plate protruding from an inner wall of the housing 21 toward the receiving cavity 211. The second limiting portion 218 forms a through hole along the axial direction, the sheath joint 52 is inserted into the through hole of the second supporting plate 218, and the inner diameter of the through hole of the second limiting portion 218 is slightly larger than the outer diameter of the corresponding sheath joint 52, so as to limit the sheath joint 52 in the radial direction of the taking-out device 100.

As shown in fig. 2 and 9, a distal end of the inner wall of the receiving cavity 211 of the housing 21 is provided with a third limiting portion 219 for limiting the sheath tube 50 in the radial direction and the axial direction, and the third limiting portion 219 is disposed adjacent to the distal end of the housing 21 with respect to the second limiting portion 218. The third stopper 219 protrudes from the inner wall of the housing 21 toward the receiving cavity 211, and is in the form of a ring plate in this embodiment. The distal end of the sheath joint 52 in the housing 21 is provided with a limiting groove 5212 (fig. 9) corresponding to the third limiting part 219, and the third limiting part 219 is configured to be rotatably received in the limiting groove 5212 to limit the movement range of the proximal end of the sheath 50 in the radial direction and the axial direction, so that the sheath 50 is hardly movable in the axial direction and the radial direction relative to the housing 21, and the sheath 50 can rotate relative to the housing 21.

In an alternative embodiment, the first limiting portion, the second limiting portion and the third limiting portion may adopt the implementation manner of the first reinforcing rib 214 and the second reinforcing rib 215 (fig. 7) as described above, or other limiting manners commonly used in the art to limit the components, which is not described herein again.

Referring to fig. 3 and 6, when assembling the worm 23, the worm wheel assembly 25 and the sheath adapter 52, the rotating wheel 251 is rotatably sleeved outside the rod 230, and specifically, the sliding guide pin 2510 of the rotating wheel 251 is slidably inserted into the first guide groove 232 from the distal end of the rod 230; the end of the tube body 521 of the sheath tube joint 52, which is far away from the snap ring 523, is inserted into the barrel 2551 of the connecting cylinder 255 from the proximal end and penetrates out of the through hole at the distal end of the connecting cylinder 255 until the second rack 5232 of the snap ring 523 is meshed with the first rack 2556 of the connecting ring 2553; the worm 23 and the rotating wheel 251 which are assembled together are installed on the connecting cylinder 255, specifically, one end of the rod body 230, which is provided with the bidirectional spiral groove 231, is inserted into the inner cavity of the sheath tube connector 52 from the proximal end of the sheath tube connector 52, and the rotating wheel 251 is clamped on the connecting cylinder 255, specifically, the clamping blocks 2554 of the connecting cylinder 255 are respectively clamped in the clamping holes 2512 corresponding to the rotating wheel 251, so that the connecting cylinder 255 and the rotating wheel 251 are fixedly connected. At this time, the first elastic element 2515 elastically pushes the snap ring 523 to make the first rack 2556 and the second rack 5232 engage with each other; the distal end of the rod 230 is inserted into the lumen of the sheath connector 52 to drive the worm gear assembly 25 to rotate bi-directionally relative to the worm 23.

As shown in fig. 2, the manipulation handle 20 is further provided at a proximal end thereof with a second elastic member 265 moving synchronously with the worm 23, the second elastic member 265 being for driving the manipulation member 26 to move toward the distal end. Specifically, the second elastic member 265 is accommodated in the accommodating cavity 211 of the housing 21, and two opposite ends of the second elastic member 265 respectively abut against the proximal end of the connecting portion 261 of the operating member 26 and the proximal end boundary of the accommodating cavity 211. The operating member 26 is used for receiving an external pulling force to slide the worm 23 in the axial direction and compress the second elastic member 265, and when the external pulling force disappears, the second elastic member 265 rebounds and generates an elastic restoring force for pushing the operating member 26 and the worm 23 to move towards the far end. In this embodiment, the second elastic member 265 is a spring.

The steering handle is provided with a tubular sheath 267 at the end of the second resilient member 265 adjacent the steering member 26. The sheath 267 includes a tubular main body 2671 and a bent portion 2673 extending from the main body 2671 toward the axis. The main body 2671 is disposed around a distal end of the second elastic element 265, and a distal end of the second elastic element 265 is axially compressible or extendable in the main body 2671. The side surface of the bent portion 2673 facing the proximal end abuts against the distal end of the second elastic member 265, and the side surface of the bent portion 2673 facing the distal end abuts against the proximal end of the operating member 26. The main body 2671 extends axially for a length greater than that of the guide groove 213, and during the synchronous sliding of the sheath 267 and the second elastic member 265 along with the operating member 26, the sheath 267 can prevent the second elastic member 265 from deforming radially into the guide groove 213 or extending out of the housing 21 through the guide groove 213.

As shown in fig. 2, the proximal end of the housing 21 is axially opened with a guide groove 213 communicating with the receiving cavity 211, the operating element 26 includes a first portion and a second portion extending from the first portion to at least one side, the first portion is received in the inner cavity of the housing 20, the second portion extends out of the housing 20 through the guide groove 213, and the operating element 26 can slide along the guide groove 213. In this embodiment, the first portion is a connection portion 261, the second portion is handles 263 disposed at two opposite sides of the connection portion 261, the connection portion 261 is axially slidably received in the casing 20, and the two handles 263 respectively extend out of the housing 21 through the guide groove 213. The worm 23 is connected to the connecting portion 261 at the proximal end, and the connecting portion 261 slides in the axial direction to drive the worm 23 to slide in the axial direction. The guide groove 213 extends in the axial direction and has a length long enough to allow the operating member 26 to slide back and forth in the axial direction along the guide groove 213 and to restrict the range of movement of the operating member 26 in the circumferential direction from rotating about the axial direction. Thus, the operating member 26 can slide the worm 23 in the axial direction along the guide groove 213, and cannot rotate the worm 23 in the circumferential direction.

In this embodiment, the housing 21 is provided with two opposite guide grooves 213, and the operating element 26 is pulled to the proximal end to drive the connecting portion 261 to slide along the guide grooves 213, and the sliding of the connecting portion 261 drives the worm 23 to slide. It will be appreciated that in a modified embodiment, the operating member 26 includes a connecting portion 261 that slides along the guide slot 213 and a handle that extends outwardly from the connecting portion 261 and extends out of the housing 21 through the guide slot 213.

Referring again to fig. 2, 4 and 9, the worm 23 is provided with a threading channel 2301 along the axial direction, the threading channel 2301 is communicated with the threading lumen of the sheath 50, the threading channel 2301 is formed at the proximal end thereof and has a proximal opening on the side wall of the worm 23, and the proximal end of the guide wire 500 passes through the dilating head 80, the threading lumen of the sheath 50 and the threading channel of the worm 23 in sequence and then passes out of the housing 21, so that the operator, such as a surgeon, can take out the guide wire stripped of the fibrous tissue from the control handle 20.

As shown in FIG. 9, the opening in the side wall of housing 21 corresponding to threading channel 2301 has a wire exit 2101 and the proximal end of wire 500 exits threading channel 2301 through wire exit 2101 and extends out of extraction device 100. The outlet opening 2101 is near the proximal end of the operating member 26. The distal opening 2301 of the threading channel extends axially and the proximal end of the lead 500 extends through the distal opening 2301 to the outlet opening 2101.

The housing 21 is also provided with a guide 2105, the guide 2105 extending from the edge of the exit hole 2101 into the distal opening 2301 of the threading channel, the wire 500 at the distal opening 2301 of the threading channel sliding out of the exit hole 2101 along the guide 2105. Preferably, the distal end of the guide 2105 interferes with the boundary of the threading channel away from the distal opening 2301, and when the worm 23 is slid axially proximally, the distal end of the guide 2105 slides within the distal opening 2301, and the guide 2105 seamlessly joins the boundary of the threading channel without obstructing the proximal end of the guidewire 500, and further facilitating the passage of the proximal end of the guidewire 500 through the exit hole 2101 along the guide 2105.

As shown in fig. 2, the housing 21 is a tubular structure sealed at the proximal end, and the housing 21 includes a body 209 and an end block 210 connected to each other. The body 209 extends along the axial direction, the receiving cavity 211, the receiving groove 212, the first limiting portion 217, the second limiting portion 218 and the third limiting portion 219 are all disposed in the body 209, and the end block 210 is connected to the proximal end of the body 209 and has a different extending direction from the body 209. In this embodiment, the end-block 210 is perpendicular to the direction of extension of the body 209, i.e. the end-block 210 extends in a radial direction perpendicular to the axial direction. It will be appreciated that in alternate embodiments, end block 210 extends parallel and perpendicular to body 209. Additionally, end block 210 may extend from the proximal end of body 209, radially to one or both sides, or circumferentially. Specifically, in the present embodiment, the end block 210 is symmetrical with respect to the axial direction (axis), in other words, the end block 210 extends from the proximal end of the body 209 to opposite sides in the radial direction. Further, the end block 210 has a fishtail shape, and the fishtail-shaped end block 210 can increase the contact area with the fingers of the surgeon for convenient operation. In alternate embodiments, end block 210 may take other shapes, such as a bar, a cone, a solid shape including a free-form surface, or other regular or irregular shapes.

The distal end of the shell 21 is provided with a hollow soft rubber nozzle 2107, and the sheath tube 50 is arranged through the soft rubber nozzle 2107; the outer sheath 55 is sleeved on the periphery of the sheath tube 50, and the proximal end of the outer sheath 55 is inserted into the soft rubber nozzle 2107.

As shown in fig. 2, the worm wheel assembly 25, the worm 23 and the sheath joint 52 which are assembled into a whole are installed in the housing 21, specifically, the worm wheel assembly 25 is accommodated in the accommodating space 216 of the housing 21, the connecting column 235 of the worm 23 is connected to the distal end of the connecting portion 261, and the first limiting portion 217 supports the worm 23 so that the worm 23 can slide in the axial direction; the guide portion 2105 is slidably inserted into the chute 2303; the second stopper 218 supports the tube 521 of the sheath adapter 52, and the third stopper 219 is rotatably inserted into the stopper groove 5212 of the tube 521, so that the sheath adapter 52 can rotate with the worm gear assembly 25 and cannot slide in the axial direction. The proximal end of the sheath 50 is fixedly connected to the distal end of the sheath connector 52 by screwing, and at this time, the expansion head 80 is communicated with the threading lumen of the sheath 50, the threading channel of the worm 23 and the outlet hole 2101 (as shown in fig. 9) of the housing 21 to form a continuous threading lumen 201 for the transmission of the wire 500, so as to facilitate the insertion of the wire 500.

Referring to fig. 2, 7 and 9, during the operation of the extraction device 100, the physician inserts a proximal end of a lead 500, such as an electrode lead, in the patient into the threading lumen of the expansion head 80; the physician grasps the manipulation handle 20 and pushes the manipulation handle 20 distally so that the sheath 50 and the expansion head 80 are gradually advanced into the patient's blood vessel along the electrode lead 500; when the resistance to pushing the manipulation handle 20 distally is high, it indicates that the expansion tip 80 interferes with the tissue bound around the guide wire 500.

Pulling the operating member 26 proximally to drive the worm 23 to slide proximally in the axial direction, and the worm 23 drives the worm wheel assembly 25 to move proximally until the proximal end of the rotating wheel 251 abuts against the first rib 214, and the gap between the distal end surface of the connecting cylinder 255 and the second rib 215 increases; the first elastic member 2515 elastically pushes the snap ring 523 to engage the first rack 2556 with the second rack 5232. The worm 23 slides proximally, and the inner surface of the second guiding slot 233 slidably pushes against the sliding guiding pin 2510 of the rotating wheel 251 to rotate the rotating wheel 251 in a first direction (i.e. clockwise when viewed from the proximal end to the distal end of the extracting device 100); since the rotating wheel 251 is fixedly connected to the connecting cylinder 255 and the first rack 2556 is engaged with the second rack 5232, the rotating wheel 251 rotates the sheath connector 52, the sheath 50 and the dilating head 80 in a first direction, so that the sharp blade of the dilating head 80 cuts the tissue around the guide wire 500.

When the operating member 26 is further pulled to the proximal end to further slide the worm 23 axially to the proximal end, the sliding guide pin 2510 of the rotating wheel 251 slides along the second guide slot 233 to pass over the steering switching portion 234, and then the sliding guide pin 2510 of the rotating wheel 251 slides along the first guide slot 232 to rotate the rotating wheel 251 in the second direction (i.e. counterclockwise when viewed from the proximal end to the distal end of the extracting device 100); the rotating wheel 251 drives the sheath connector 52, the sheath 50 and the expansion head 80 to rotate along the second direction, so that the sharp blade of the expansion head 80 cuts the tissue combined around the electrode lead; until the operating member 26 slides proximally along the guide slot 213 until the connecting portion 261 abuts against the proximal end of the bidirectional spiral groove 231.

In the whole process of pulling the operating element 26 to the proximal end, the worm 23 first drives the rotating member and the sheath tube 50 to rotate along the first direction, and after the sliding guide pin 2510 crosses the steering switching portion 234, the worm 23 drives the rotating member and the sheath tube 50 to rotate along the second direction, so that the dilating head 80 can effectively cut the fibrous tissue wrapped around the guide wire 500, and other guide wires in the blood vessel can be prevented from being intertwined with each other and being scratched by the dilating head 80 due to the distortion of the blood vessel wall.

As can be seen from the specific operation process of the above-mentioned taking-out device 100, the operation member 26 includes a first time period and a second time period in the process of compressing the second elastic member 265, in the first time period, the sliding guide pin 2510 slides in the second guide slot 233, that is, the sliding guide pin 2510 slides from the proximal end of the second guide slot 233 to the steering switching portion 234, and rotates clockwise relative to the worm 23 corresponding to the worm wheel assembly 25; in the second period, the sliding guide pin 2510 slides in the first guide groove 232, and the sliding guide pin 2510 slides from the steering switching part 234 to the distal end of the first guide groove 233, corresponding to the worm wheel assembly 25 rotating counterclockwise relative to the worm 23. That is, during the process that the operating member 26 compresses the second elastic member 265, the linear motion of the worm 23 is converted into the rotation of the worm wheel assembly 25, and the worm wheel assembly 25 performs the bidirectional rotation with respect to the worm 23, first the clockwise rotation and then the counterclockwise rotation. In the present embodiment, the sheath 50 is rotated clockwise and counterclockwise by about 280 degrees.

Referring to fig. 2, 8 and 9, during the proximal movement of the worm 23, the second elastic member 265 is compressed to generate elastic deformation, and the elastic restoring force generated by the rebound of the compressed second elastic member 265 is used to push the worm 23 to move distally. When the pulling force on the control handle 20 is released, that is, the operating part 26 of the control handle 20 is released, the elastic force generated by the second elastic part 265 pushes the operating part 26 to the far end to drive the worm 23 to slide towards the far end along the axial direction, the worm 23 drives the worm wheel assembly 25 to move towards the far end until the far end of the rotating part abuts against the second reinforcing rib 215, and the gap between the near end surface of the rotating wheel 251 and the first reinforcing rib 214 is increased; since the sheath connector 52 is axially fixed with respect to the housing 21, the gap between the connection ring 2553 and the snap ring 523 increases until the gap between the first rack 2556 and the second rack 2532 is greater than the maximum depth of engagement therebetween, so that the first rack 2556 and the second rack 5232 are disengaged from each other, i.e., the sheath connector 52 is not snapped to the worm gear assembly 25. After the first engaging portion and the second engaging portion are disengaged from each other, the worm wheel assembly 25 continues to rotate under the driving of the axial movement of the worm 23, and the rotation of the worm wheel assembly 25 does not drive the sheath joint 52, the sheath 50 and the expansion head 80 to rotate.

After the first engaging portion and the second engaging portion are disengaged from each other, the inner surface of the first guiding groove 232 on the worm 23 continuously pushes the sliding guiding pin 2510 of the rotating wheel 251 in a sliding manner, so as to drive the rotating wheel 251 to continuously rotate along the first direction; after the sheath joint 52 and the worm wheel assembly 25 are separated from each other, the sheath joint 52 cannot be driven to rotate by the friction force generated by the first elastic element 2515 of the worm wheel assembly 25 on the sheath joint 52, and therefore, the tail end of the first elastic element 2515 slides along the proximal end face of the clamping ring 523.

Because the rotating wheel 251 is fixedly connected with the connecting cylinder 255, the second elastic member 265 continuously pushes the operating member 26 to slide towards the proximal end, the operating member 26 continuously drives the worm 23 to slide towards the distal end along the axial direction, after the sliding guide pin 2510 of the rotating wheel 251 slides along the first guide groove 232 to pass over the steering switching portion 234, the sliding guide pin 2510 of the rotating wheel 251 slides along the second guide groove 233 to drive the rotating wheel 251 to rotate along the second direction; but the rotating wheel 251 will not rotate the sheath connector 52, the sheath 50 and the expanding head 80.

During the rebound of the second elastic member 265, i.e. after releasing the operating member 26, the sheath 50 and the expansion head 80 do not rotate with the worm gear assembly 25, thereby reducing the load of the rotation of the worm gear assembly 25, facilitating the smooth sliding of the sliding guide pin 2510 of the rotating wheel 251 from the distal end of the first guide groove 232 to the proximal end of the second guide groove 233, and preventing the sliding guide pin 2510 from being stuck in the bidirectional spiral groove 231, particularly in the vicinity of the steering switching portion 234.

When the operating member 26 slides along the guide groove 213 to near the proximal end abutting against the guide groove 213, specifically, the worm 23 moves from the proximal end to the most distal end in its axial movement range, the first rack 2556 and the second rack 5232 are engaged with each other.

As shown in fig. 2 to 3, the first elastic member 2515 applies a first pushing force to the rotation wheel 251, and the second elastic member 265 applies a second pushing force to the rotation wheel 251 through the worm 23. During the rebound of the second elastic member 265, the elastic force is gradually reduced, i.e., the second thrust force is gradually reduced. When the first pushing force is greater than the second pushing force, the first elastic member 2515 pushes the rotating wheel 251 and the connecting cylinder 255 to move proximally relative to the sheath connector 52 until the first rack 2556 is engaged with the second rack 5232, i.e. the first engaging portion and the second engaging portion are engaged with each other, so that the second elastic member 265, the operating member 26, the worm 23 and the worm-gear assembly 25 return to the initial position, and the user can pull the manipulating handle 20 proximally again.

In other embodiments, the first elastic element 2515, the first rack 2556 and the second rack 5232 are omitted from the worm gear assembly 25, and the connecting cylinder 255 is directly and fixedly connected to the sheath connector 52, that is, the distal end of the connecting cylinder 255 is fixedly connected to the proximal end of the sheath connector 52 (for example, the connecting cylinder 255 is integrally formed with the sheath connector 52), and the proximal end of the sheath connector 52 cannot be separated from the worm gear assembly 25. That is, in the present embodiment, the process of moving the worm 23 to the proximal end is the same as that of the above-mentioned embodiment, and during the process of moving the worm 23 to the distal end, the worm wheel assembly 25 drives the sheath joint 52 to rotate synchronously, that is, after the operating member 26 is released, the sheath 50 and the expansion head 80 rotate bidirectionally along with the worm wheel assembly 25.

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

1. The utility model provides an extraction element for take out implant at internal long and thin structure, its characterized in that, extraction element including control handle, connect in the sheath pipe of control handle distal end, and connect in the expansion head of sheath pipe distal end, wherein, control handle includes the driving piece and rotates the piece, the one end of rotating the piece is connected the near-end of sheath pipe, the other end of rotating the piece is connected the driving piece, the driving piece is used for the drive rotate piece both-way rotation, in order to drive the sheath pipe reaches expansion head both-way rotation.

2. The extraction device according to claim 1,

the driving piece comprises a worm, a bidirectional spiral groove is formed in the peripheral surface of the worm, and two ends of the bidirectional spiral groove respectively extend in opposite directions in a spiral mode;

the rotating part comprises a worm wheel assembly, a through hole for penetrating the worm is formed in the worm wheel assembly, and a guide sliding pin inserted into the bidirectional spiral groove is further arranged on the surface of the worm wheel assembly;

in the process that the worm moves along the axial direction, the guide sliding pin slides in the bidirectional spiral groove, and two ends of the bidirectional spiral groove drive the worm wheel assembly to rotate along opposite directions through the guide sliding pin respectively.

3. The extraction device according to claim 2, wherein the sliding guide pin is configured to drive the worm gear assembly to rotate in two opposite directions during sliding from the proximal end to the distal end of the bi-directional helical groove or from the distal end to the proximal end of the bi-directional helical groove.

4. The removing device according to claim 3, wherein the bidirectional spiral groove includes a first guide groove provided on an outer peripheral surface of the worm, the first guide groove spirally extending in a first direction, and a second guide groove communicating with a proximal end of the first guide groove, the second guide groove spirally extending in a second direction, the first direction being opposite to the second direction.

5. The takeout apparatus of claim 4 wherein the bi-directional helical groove includes a turn switch connected between the first guide groove and the second guide groove, the worm driving the worm-gear assembly to rotate in an opposite direction after the guide slide pin passes over the turn switch.

6. The extraction apparatus according to claim 2, wherein said worm gear assembly comprises:

the surface of the rotating wheel is provided with the guide sliding pin; and

the connecting cylinder is buckled at the edge of the rotating wheel, and the connecting cylinder and the rotating wheel are both provided with the through holes for penetrating the worm in the axial direction;

under the drive of the worm, the rotating wheel rotates along two opposite directions, and the connecting cylinder moves synchronously along with the rotating wheel.

7. The takeout device of claim 6 wherein the connector barrel and the rotator wheel are snap-fit to each other.

8. The retrieval device of claim 7, wherein the sheath includes a sheath connector and an inner sheath, both ends of the inner sheath are connected to the expansion head and the sheath connector, respectively, and a proximal end of the sheath connector is connected to the worm gear assembly.

9. The extraction device of claim 8, wherein the sheath fitting is fixedly connected to the connector barrel of the worm gear assembly.

10. The retrieval device of claim 8, wherein the proximal end of the sheath hub is telescoped with the distal end of the connector barrel.

11. The extraction device according to claim 10,

the through holes are formed in the corresponding positions of the near end and the far end of the connecting cylinder;

the near-end cover that the sheath pipe connects is located inside the distal end of connecting cylinder, the distal end that the sheath pipe connects passes the through-hole of connecting cylinder distal end extends to the outside of connecting cylinder.

12. The retrieval device of claim 11, wherein the distal end of the connector barrel is formed with a first engagement portion projecting toward the proximal end of the sheath adapter, the proximal end of the sheath adapter is provided with a second engagement portion projecting toward the first engagement portion, and the sheath adapter follows the connector barrel in a synchronous movement when the first engagement portion and the second engagement portion are engaged with each other.

13. The retrieval device of claim 12, wherein the first engagement portion includes a first rack disposed on the connector barrel and the second engagement portion includes a second rack disposed on the sheath adapter, the first rack being disengageably engageable with the second rack.

14. The extraction device according to claim 12,

the sheath pipe joint is fixed in position in the axial direction;

when the worm moves along the axial proximal end, the rotating wheel drives the connecting cylinder to move proximally relative to the sheath pipe joint along with the worm, so that the first meshing part and the second meshing part are meshed with each other; when the worm moves along the axial far end, the rotating wheel drives the connecting cylinder to follow the worm to move towards the far end relative to the sheath pipe joint, so that the first meshing part and the second meshing part which are meshed with each other are gradually separated.

15. The extraction apparatus according to claim 14 wherein the worm gear assembly continues to rotate upon axial movement of the worm after the first and second engagement portions are disengaged from one another.

16. The extraction apparatus according to claim 14 wherein the first and second engagement portions are interengaged as the worm moves from the proximal end to the distal-most end of its range of axial movement.

17. The takeout apparatus of claim 16 wherein the rotation wheel includes a rotation ring and a first resilient member disposed at a distal end of the rotation ring, both ends of the first resilient member resiliently abutting the distal end of the rotation ring and the proximal end of the sheath adapter in the axial direction, respectively, such that the first engagement portion and the second engagement portion are ensured to be engaged with each other during proximal movement of the worm and when the worm is moved to the distal-most end within the axial movement range thereof.

18. The extraction device according to claim 17, wherein said manipulation handle is further provided at its proximal end with a second elastic member moving synchronously with said worm;

when the worm moves towards the near end, the second elastic piece is compressed and generates elastic deformation, and the elastic restoring force generated by the rebound of the compressed second elastic piece is used for pushing the worm to move towards the far end;

first elastic component is to the thrust of the directional near-end that the swiveling wheel was applyed is first thrust, the second elastic component passes through the worm is right the thrust of the directional far-end that the swiveling wheel was applyed is the second thrust the in-process that the second elastic component kick-backed, works as first thrust is greater than behind the second thrust, first elastic component promotes the swiveling wheel for sheath pipe head is to the proximal motion, makes first meshing portion with second meshing portion intermeshing.

19. The extraction apparatus according to claim 18, wherein the operating handle further comprises an operating member connected between the worm and the second elastic member, the operating member is configured to receive an external pulling force to slide the worm axially and proximally and compress the second elastic member, and when the external pulling force disappears, the second elastic member rebounds and generates an elastic restoring force for pushing the operating member and the worm to move distally.

20. The retrieval device of claim 15, wherein the manipulation handle further comprises a housing provided at an inner wall surface thereof with a stopper portion extending toward the retrieval device axis for limiting a movement range of the sheath fitting in the axial direction.

21. The extraction apparatus as claimed in claim 20, wherein the sheath adapter has a limiting groove corresponding to the limiting portion, the limiting portion is configured to be received in the limiting groove, and the limiting portion is configured to limit a range of movement of the sheath adapter in a radial direction and an axial direction.

22. The removing device according to claim 21, wherein a receiving groove is formed in an inner wall of the housing, the worm wheel assembly is configured to be received in the receiving groove, a first rib and a second rib are respectively formed on two side walls of the receiving groove, the first rib and the second rib are axially spaced apart from each other, a length of the worm wheel assembly in the axial direction is a length of the worm wheel, a length of the first engaging portion and the second engaging portion in the axial direction is an engaging depth, and an axial dimension between mutually adjacent surfaces of the first rib and the second rib is greater than a sum of the length of the worm wheel and the engaging depth.

23. The retrieval device of claim 20, wherein the drive member and the rotational member are disposed within the lumen of the housing, and the proximal end of the sheath hub is coupled to the rotational member after the distal end of the housing is inserted into the lumen of the housing.

24. The extraction device of claim 20,

the shell is provided with a guide groove which penetrates through the inner cavity of the shell, and the guide groove extends along the axial direction;

25. The retrieval device of claim 20, wherein the expansion head and the sheath are each provided with a threading lumen for conveying the elongated structure, the worm axially defines a threading channel, the housing is provided with an exit hole corresponding to an opening of the threading channel, and the proximal end of the elongated structure extends out of the retrieval device through the threading lumen of the expansion head, the threading lumen of the sheath, the threading channel, and the exit hole in that order.

26. The retrieval device of claim 25, wherein the distal opening of the threading channel opens onto a side wall of the worm, the housing further providing a guide extending from an edge of the exit aperture into the distal opening of the threading channel, the elongated structure at the distal opening of the threading channel sliding out of the exit aperture along the guide.