CN219847856U - Intracorporeal implant recovery device - Google Patents

Abstract

The utility model provides an internal implant recovery device, which comprises a capturing part, a control part and a locking piece, wherein the capturing part comprises a first capturing piece and a second capturing piece which can move relatively, the first capturing piece and the second capturing piece are separated from each other to form a first state for a target to enter an opening between the first capturing piece and the second capturing piece, and a second state for limiting the target is formed by approaching to each other, and at least one through hole is formed in the first capturing piece and the second capturing piece which are approaching to each other under the second state; the control part is connected with the capturing part and used for controlling the first capturing part and the second capturing part to switch between the first state and the second state; the locking piece can move relative to the capturing part and is provided with a locking space which is inserted into at least one through hole and forms a target object containing space between the first capturing piece and/or the second capturing piece. The first capturing piece and the second capturing piece can be matched with the locking piece in the second state to limit the target object in the locking space to achieve capturing.

Description

Intracorporeal implant recovery device

Technical Field

The utility model relates to the field of medical equipment, in particular to an in-vivo implant recovery device through a inferior vena cava approach.

Background

With the increase of the implantation amount of heart implantation medical instruments such as domestic annual cardiac pacemakers, buried cardiac transfer defibrillators, cardiac resynchronization treatments and the like and the increase of the duty ratio of elderly patients, the related long-term complications and problems such as electrode lead fracture, electrode abrasion and the like are also increased year by year, so that the demand for electrode lead recovery is rapidly increased. The current method for recycling electrode wires mainly comprises two methods: the first is to take out the electrode lead from the body through surgical open chest operation, which has the defects of high operation cost, large wound and the like. The second is to recover the electrode wire through vein intervention, under the condition of radiography, deliver the recovery device to the electrode wire position through vein, then capture and load the electrode wire to be recovered through the recovery device, finally withdraw the electrode wire along with the recovery device outside the body, and complete the recovery of the electrode wire. Although the method has the advantages of low cost, small wound and the like, the electrode lead to be recovered and implanted for a long time often adheres seriously in blood vessels and heart chambers in the operation process, and the recovery device is difficult to capture and separate the electrode lead efficiently and firmly due to the movement along with the beating of the heart, so that the electrode lead is finally safely removed. At present, a solid electrode lead is put into clinical application in China from 2011, the number of the solid electrode lead is increased in tens of thousands of cases, the clinical problem of long-term removal is also increased gradually, and the lead is relatively safe to remove from the inferior vena cava approach, but an effective and safe removing tool is not yet available.

Disclosure of Invention

The object of the present utility model is to overcome the drawbacks and deficiencies of the prior art by providing an intracorporeal implant retrieval device via the inferior vena cava route that can efficiently and securely capture and remove spent electrode leads. The technical scheme adopted by the utility model is as follows:

the present utility model provides an intracorporeal implant retrieval device accessible via the inferior vena cava, comprising: the capturing part comprises a first capturing part and a second capturing part which can move relatively, the first capturing part and the second capturing part are in a first state of being separated from each other to form an opening for a target object to enter between the first capturing part and the second capturing part, the first capturing part and the second capturing part are close to each other to form a second state of limiting the target object, and in the second state, at least one through hole is formed in the first capturing part and the second capturing part which are close to each other;

the control part is connected with the capturing part and used for controlling the first capturing part and the second capturing part to switch between the first state and the second state;

the locking piece is movable relative to the capturing part and is provided with a locking space which is inserted into at least one through hole and forms a target object containing space between the first capturing piece and/or the second capturing piece.

Specifically, at least one of the first capturing element and the second capturing element can be provided with an annular structure, when the first capturing element is in a first state, the distal end sections of the first capturing element and the second capturing element are separated in the radial direction, a capturing space with an opening at the distal end is formed between the first capturing element and the second capturing element, and when the second capturing element is in a second state, the distal end sections of the first capturing element and the second capturing element are mutually close in the radial direction and are arranged in a crossing manner; the locking piece can move relative to the capturing part in the axial direction and can penetrate through at least one annular structure.

Further, the first capturing element and the second capturing element both comprise two segments of capturing wires, in the same capturing element, the two segments of capturing wires extend towards the direction far away from each other from the near end, then extend towards the direction close to each other through bending, and are connected in a crossing way at the far end; in the first state, a distance between the distal end of the first capture member and the distal end of the second capture member is greater than a distance between the proximal end of the first capture member and the proximal end of the second capture member.

Further, when in the first state, the capturing wires are arranged in an inverted V shape at the distal end of the first capturing member, and the two capturing wires are arranged in an inverted U shape at the distal end of the second capturing member; or the two sections of the catching wires are arranged in an inverted U shape at the far end of the first catching member, and the two sections of the catching wires are arranged in an inverted V shape at the far end of the second catching member; or, the two segments of capturing wires are arranged in an inverted V shape or inverted U shape at the distal end of the first capturing piece and the distal end of the second capturing piece.

Preferably, the catheter further comprises a catheter tube, wherein the catheter tube is provided with a first inner cavity extending along the axial direction; the control part comprises a pushing part which is arranged in the first inner cavity in a penetrating way and can move relative to the catheter along the axial direction, and the distal end of the pushing part is connected with the capturing part;

under the driving action of the pushing piece, the capturing part can deform under the action of the acting force of the guide pipe (namely, the capturing part gradually retracts into the guide pipe), and the guide pipe is driven by the pushing piece to axially move so as to control the first capturing piece and the second capturing piece to switch between the first state and the second state.

Preferably, the through hole comprises a first through hole arranged on the first capturing piece and a second through hole arranged on the second capturing piece, when the first capturing piece and the second capturing piece are in a second state, the first through hole and the second through hole are at least partially overlapped to form a third through hole, and the locking piece penetrates through the third through hole.

Preferably, when the first capturing element and the second capturing element are in the second state, the distal end section of the first capturing element penetrates into the second through hole, so that the distal end section of the first capturing element is at least partially located outside the second capturing element to form a first out-of-reach section, and/or the distal end section of the second capturing element is at least partially sleeved outside the first capturing element to form a second out-of-reach section.

Preferably, the first and/or second catch element has a convex structure facing away from the central axis of the catch element, and the convex structure is at least partially located in the distal section of the first and/or second catch element.

Preferably, the first and second catch members are at least partially formed of a shape memory material.

Preferably, the locking piece is of an elongated structure and penetrates into the first inner cavity or penetrates into a second inner cavity extending along the axial direction in the pushing piece, and the locking piece can slide relative to the capturing part in the axial direction; the locking piece also comprises a pushing part and a guiding part connected with the distal end of the pushing part, wherein the guiding part is at least partially made of elastic materials. Further, the bending stiffness of the guide portion is less than the bending stiffness of the pushing portion, the guide portion includes a spring structure, and the pitch of the spring structure is substantially equal; alternatively, the pitch of the spring structure increases gradually from the proximal end to the distal end.

Further, the distal end of the guide part is further provided with a convex structure, and the convex structure is one or more of spherical, hemispherical and drop-shaped.

Preferably, the control part further includes a locking unit; when the first capturing piece and the second capturing piece are in a second state, the locking unit locks the pushing piece so that the pushing piece cannot slide in the axial direction, and when the locking unit releases the locking of the pushing piece, the pushing piece can slide in the axial direction. The specific arrangement may be as follows: the control main body is provided with a control hole, the control hole penetrates through the side wall of the control main body, a first thread is arranged in the control hole, the locking unit penetrates through the control hole and is provided with a second thread matched with the first thread, when the locking unit rotates in a first direction, the locking unit can move towards a direction close to the handle and can mutually abut against the outer surface of the handle until the locking unit locks mutually, and when the locking unit rotates in a second direction, the locking unit can move towards a direction far away from the handle.

Preferably, the developing device is further provided with a developing part, two ends of the developing part are respectively connected with the first capturing part and the second capturing part, when the first capturing part and the second capturing part are in a first state, the developing part is in a straight line shape, and when the developing part is acted by axial external force, the developing part is in a non-straight line shape.

The beneficial effects of the utility model are as follows: the first capturing piece and the second capturing piece are in the second state, so that the first capturing piece and the second capturing piece can cooperate with the locking piece to limit a target object in a fixed space to achieve capturing; the size of the locking space can be adjusted by matching the guide pipe with the pushing piece and the capturing part, and the first capturing piece and the second capturing piece can form clamping force on the target object by reducing the size of the locking space, so that the target object is limited between the first capturing piece and the second capturing piece to be captured.

Drawings

In order to more clearly illustrate the embodiments of the utility model or the technical solutions of the prior art, the drawings which are required in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the utility model, and that it is within the scope of the utility model to one skilled in the art to obtain other drawings from these drawings without inventive faculty.

FIG. 1 is a schematic view of a recycling apparatus according to an embodiment of the present utility model;

FIG. 2 is a partial cross-sectional view of the recovery device of FIG. 1;

FIG. 3 is a schematic view of the capturing portion in a first state according to an embodiment of the present utility model;

FIG. 4 is a top view of the catch of FIG. 3;

FIG. 5 is a schematic view of the capturing portion in a second state according to the embodiment of the present invention;

FIG. 6 is a top view of the catch of FIG. 5;

FIG. 7 is a schematic view of the loop structure of the capturing portion of FIG. 3;

FIG. 8 is a schematic view of a locking member according to an embodiment of the present invention;

FIG. 9 is a schematic structural diagram of a control assembly according to an embodiment of the present invention;

FIG. 10 is a partial cross-sectional view of the steering assembly of FIG. 9;

FIG. 11 is a schematic diagram illustrating an assembly of a steering assembly according to an embodiment of the present invention;

fig. 12a to 12e are schematic views illustrating a process of recovering electrode wires by the recovery device according to an embodiment of the present invention.

Detailed Description

In order that the above objects, features and advantages of the invention will be readily understood, a more particular description of the invention will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The present invention may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit of the invention, whereby the invention is not limited to the specific embodiments disclosed below.

In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present invention, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

It will be understood that when an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like are used herein for illustrative purposes only and are not meant to be the only embodiment.

In the field of interventional medical devices, the end of a medical device implanted in a human or animal body closer to an operator is generally referred to as a "proximal end", the end farther from the operator is generally referred to as a "distal end", and the "proximal end" and the "distal end" of any component of the medical device are defined according to this principle. "axial" generally refers to the longitudinal direction of a medical device when delivered, and "radial" generally refers to the direction of the medical device perpendicular to its "axial" direction, and defines the "axial" and "radial" directions of any component of the medical device in accordance with this principle.

Referring to fig. 1, the present embodiment provides a recovery device 100, and the recovery device 100 can be used to remove an elongated target object, such as a guide wire, etc., from a living body. For ease of understanding, the present embodiment is illustrated with the lead wire of the cardiac implantable medical device as the target object.

Referring to fig. 2, the recovery device 100 of the present embodiment includes a catheter 10, a capturing portion 20, a control portion 30, and a locking member 40.

Catheter 10 includes a hollow tubular member having a proximal port, a distal port, and a first lumen communicating the proximal port and the distal port, the first lumen extending along the length of catheter 10.

The control part 30 comprises a pushing member (31) and a control assembly, wherein the pushing member 31 is a hollow tubular member, and is provided with a distal end port and a second inner cavity communicated with the distal end port, and the second inner cavity extends along the length direction of the pushing member 31. The pushing member 31 is disposed through the first inner cavity of the catheter 10 and is movable relative to the catheter 10 in the axial direction. The distal end of the pushing member 31 is connected to the capturing portion 20, the capturing portion 20 is also axially movable relative to the catheter 10, and the steering assembly is connected to the catheter 10 and the pushing member 31 for changing the relative positional relationship between the catheter 10 and the pushing member 31, i.e. the relative positional relationship between the catheter 10 and the capturing portion 20.

The capturing section 20 is for capturing a target object in a living body. The catching part 20 has a radial expansion capability, can be radially contracted by an external force, and is self-expanded or restored to a natural expanded shape (also referred to as a fully expanded shape) by mechanical expansion after the external force is removed and maintains the natural expanded shape. The capturing portion 20 can be completely accommodated in the catheter 10 by manipulating the assembly, and the capturing portion 20 can be released and unfolded from the catheter 10.

Referring to fig. 3, the capturing portion 20 includes a first capturing member 21 and a second capturing member 22. The first capturing element 21 and the second capturing element 22 each have a proximal end (proximal end for short) and a distal end (distal end for short), and the proximal ends of the first capturing element 21 and the second capturing element 22 are connected to the pushing element 31. In this embodiment, the proximal end of the first capturing element 21 and the proximal end of the second capturing element 22 are fixedly connected with the distal end of the pushing element 31, and the fixed connection manner includes direct fixed connection in a manner of welding, bonding, winding, clamping, threaded connection, or fixed connection through intermediate elements such as a sleeve, a fixing wire, and a buckle, and the fixed connection manner is detachable fixed connection or non-detachable fixed connection. The distal ends of the first catch member 21 and the second catch member 22 are free ends, so that the distal ends of the first catch member 21 and the second catch member 22 are relatively movable therebetween. In other embodiments, the proximal end of the first catch member 21 and the proximal end of the second catch member 22 may be movably coupled to the pusher member 31.

The first catch member 21 and the second catch member 22 have a first state and a second state that are switchable to each other. Fig. 3 and 4 show the first capturing element 21 and the second capturing element 22 in an expanded state (i.e., the first state of the present embodiment) when they are released from the catheter 10. The first and second catches 21, 22 have at least one distal section, which is an axial region of the catch 20 (as indicated by region a in fig. 3, 5) that is closer to the distal end of the catch 20 than the proximal ends of the first and second catches 21, 22, i.e. comprises the first and second catches 21, 22 sections and the first and second out-going sections 21a, 22a forming said locking space 20 a. In the first state, the distal end sections of the first capturing element 21 and the second capturing element 22 are arranged at a radial distance from each other, for example, the capturing portion 20 has at least one axial plane (i.e. a plane parallel to the central axis, the virtual central axis of the catheter 10 being the central axis of the capturing portion 20 in the present invention), and in the distal end sections, the first capturing element 21 and the second capturing element 22 are arranged on both radial sides of the axial plane. In this embodiment, the first capturing element 21 and the second capturing element 22 have an inner side and an outer side, respectively, when the first capturing element 21 and the second capturing element 22 are defined as inner sides and the first capturing element 21 and the second capturing element 22 are defined as outer sides, respectively. As can be seen from fig. 3 and 4, when in the first state, the distal end of the first capturing member 21 is located inside the second capturing member 22, and likewise, the distal end of the second capturing member 22 is located inside the first capturing member 21, and a locking space 20a having a distal opening is formed between the first capturing member 21 and the second capturing member 22, the locking space 20a being for accommodating a target object. In order to make it easier for the target object to enter the locking space 20a from the distal opening in the first state, the distance between the distal end of the first capturing member 21 and the distal end of the second capturing member 22 of the present embodiment is larger than the distance between the proximal end of the first capturing member 21 and the proximal end of the second capturing member 22.

Referring to fig. 5, when in the second state, the distal end sections of the first and second catches 21 and 22 are radially adjacent to each other and are disposed crosswise. It will be understood that the intersection herein refers to a spatial intersection, staggering, and does not mean that there is necessarily a point of contact between the first catch member 21 and the second catch member 22.

Referring to fig. 3, both the first capturing element 21 and the second capturing element 22 have annular structures, wherein the annular structure of the first capturing element 21 has a first through hole 23 therein, and the annular structure of the second capturing element 22 has a second through hole 24 therein. Referring to fig. 5 and 6, when in the second state, at least a partial region of the first capturing element 21 penetrates from the inner side of the second capturing element 22 through the second through hole 24 and penetrates from the outer side of the second capturing element 22, such that a portion of the first capturing element 21 (e.g., the distal end of the first capturing element 21) is located at the outer side of the second capturing element 22 to form a first protruding section 21a, while another portion is located at the inner side of the second capturing element 22. At least a partial region of the second capturing element 22 is sleeved outside the first capturing element 21, so that a part of the second capturing element 22 (for example, the distal end of the second capturing element 22) is located outside the first capturing element 21 to form a second out-of-reach section 22a, and another part of the second capturing element is located inside the first capturing element 21. The first through hole 23 and the second through hole 24 intersect and have a common area, the first out-going section 21a and the second out-going section 22a are combined to form a third axial through hole 25 at a side of the far end of the common area, and the locking piece 40 can move from the near end to the far end of the capturing part 20 and penetrate through the third through hole 25. It will be appreciated that in other embodiments, the first capturing member 21 does not necessarily have to be inserted into the annular structure of the second capturing member 22, as long as a cross configuration can be formed in the second state, such that a locking space 20a with a distal end having a limiting function is formed between the first capturing member 21 and the second capturing member 22.

Referring to fig. 3 again, in the first state, the shapes of the first capturing element 21 and the second capturing element 22 are all curved structures that are concave in a direction away from the central axis of the capturing portion 20 (the virtual central axis of the catheter 10 is taken as the central axis of the capturing portion 20 in the present invention) as a whole in a side view, that is, curved structures that are concave in an outer direction. The effect of this arrangement is: as the first and second capturing elements 21, 22 are progressively compressed into the catheter 10 from the proximal end in the distal direction, the portions located outside the catheter 10 can more readily radially approach each other to form a cross-over configuration. In other embodiments, one of the first capturing element 21 and the second capturing element 22 has a curved structure recessed toward the outside, and the other is substantially linear when viewed from the side, and the whole is located on the same plane.

In the first state, the annular structure of the first catch member 21 and the annular structure of the second catch member 22 are arranged radially opposite each other, the apertures of the first through hole 23 and the second through hole 24 are radially opposite (i.e. facing each other), and the first through hole 23 and the second through hole 24 are at least partially located in the distal section. The annular structure is formed by extending wires from the proximal end to the distal end, bending and extending the wires to the proximal end, so that a structure with a closed distal end is formed, and the proximal end can be closed or opened. In other embodiments, only one of the first catch member 21 or the second catch member 22 may have an annular structure.

Referring to fig. 7, the first capturing element 21 and the second capturing element 22 each include two capturing wires 211, and in the first state and in the same capturing element, the two capturing wires 211 extend in a direction away from each other from the proximal end to the distal end, then extend in a direction approaching each other through bending, and are connected at the distal end in a converging manner to form a petal-shaped or water drop-shaped ring structure. In other embodiments, it may be oval, circular, diamond, triangular, or any other suitable shape. The capture wire 211 is made of a solid or hollow wire that may be made of a shape memory metal material (e.g., nitinol, etc.) and/or a shape memory polymer material, may be a single wire or a wire wound with multiple wires, and in other embodiments may be made of a material such as stainless steel or other elastic material. The two segments of capturing filaments 211 are integrally formed, and in other embodiments, the two segments of capturing filaments 211 may be separately fabricated and then spliced together.

The loop structures formed by the two segments of capturing threads 211 in the first capturing member 21 and the second capturing member 22 may be the same or different. For example, when in the first state, the two lengths of capture wire 211 are generally inverted V-shaped at the distal end of the first capture member 21, and the two lengths of capture wire 211 are generally inverted U-shaped at the distal end of the second capture member 22, such that the distal end of the first capture member 21 is more easily threaded into the second capture member 22; alternatively, the two segments of capture wire 211 are generally inverted U-shaped at the distal end of the first capture member 21, and the two segments of capture wire 211 are generally inverted V-shaped at the distal end of the second capture member 22; alternatively, the two lengths of capture wire 211 are each generally inverted V-shaped or inverted U-shaped at the distal end of the first capture member 21 and the distal end of the second capture member 22.

The bending rigidity of the capturing wires 211 in the same capturing member in the axial direction may be the same or different, for example, the capturing wires 211 may be divided into a proximal section and a distal section in the axial direction, and the bending rigidity of the proximal section is greater than that of the distal section, and since the distal section is more deformable, it is easier to lock the target object in cooperation with the locking member 40. In other embodiments, the bending stiffness of the proximal section is less than the bending stiffness of the distal section, reducing the sheath holding force of the catch 20 to some extent.

In this embodiment, the proximal ends of two segments of capturing wires 211 in the same capturing member are both fixedly connected to the pushing member 31 as the proximal ends of the capturing member. In other embodiments, the distal ends of the two capture wires 211 are joined, wherein the proximal end of the first capture wire 211 is fixedly connected directly to the pusher 31 as the proximal end of the capture member, and the proximal end of the second capture wire 211 is fixedly connected to the first capture wire 211 without continuing to extend proximally. In other embodiments, the proximal ends and distal ends of the two lengths of capture wire 211 are joined together to form an annular structure, and the proximal ends of the two lengths of capture wire 211 are connected to the pusher 31 by other capture wires 211. This advantageously reduces the radial compression dimension of the proximal end of the capture portion 20, making the capture portion 20 easier to compress into the catheter 10.

In the present embodiment, in the first state, the distal end of the first capturing element 21 is axially closer to the proximal end of the recovery device 100 than the distal end of the second through hole 24. This arrangement allows the first catch member 21 to pass more easily through the second catch member 22 to form the second condition.

Further, in the first state, with reference to any cross section perpendicular to the axial direction and simultaneously cutting the first capturing piece 21, the second capturing piece 22, and the second through hole 24, the width of the first capturing piece 21 on the cross section is smaller than the width of the second through hole 24 on the cross section. In other embodiments, the width of the first capturing element 21 in the cross section may be smaller than the width of the second through hole 24 in the cross section, with reference to any cross section perpendicular to the axial direction and simultaneously cutting the first capturing element 21, the second capturing element 22 and the second through hole 24, only in the distal section. The arrangement is such that the second catch member 22 provides a larger space within the loop to facilitate passage of the first catch member 21 within the loop of the second catch member 22 and in the second condition a third through hole 25 of a larger size is formed.

Referring to fig. 1, 2 and 8, in the present embodiment, the locking member 40 has an elongated structure. The locking member 40 is disposed through the second lumen of the pushing member 31 and is axially movable relative to the pushing member 31, the capturing portion 20 and the catheter 10, and the distal end of the locking member 40 is extendable from the distal end port of the pushing member 31. Referring to fig. 12c and 12d, when the first capturing element 21 and the second capturing element 22 are in the second state, the locking element 40 may move from the proximal end of the capturing portion 20 to the distal end and penetrate into the first capturing element 21 and/or the second capturing element 22 to form a distal closed locking space in cooperation with the first capturing element 21 and/or the second capturing element 22, and the locking space may enclose the target object in the locking space to prevent the target object from falling out from between the first capturing element 21 and the second capturing element 22.

Referring to fig. 8 again, in the present embodiment, the locking member 40 includes: a pushing portion 41 and a flexible guide portion 42 connected to the distal end of the pushing portion 41. The pushing part 41 and the guiding part 42 may be of an integral structure, or may be separately manufactured and then spliced and fixed. Wherein the distal end of the guide 42 is the distal end of the locking element 40. Under the same external force, compared with the pushing part 41, the guiding part 42 is easier to deform, the bending rigidity of the guiding part 42 is smaller than that of the pushing part 41, and in the process that the locking piece 40 moves distally and penetrates the first capturing piece 21 and/or the second capturing piece 22 (refer to fig. 12c and 12 d), if touching a target object, the guiding part 42 which is easier to deform can more easily bypass the target object to move distally, so that the capturing efficiency is improved.

In this embodiment, the guiding portion 42 includes a spring structure, and the proximal end of the spring structure and the distal end of the pushing section may be fixedly connected together by bonding, welding, heat shrinking, or film coating. The spring structure may be formed by winding a wire (e.g., a nickel-titanium alloy, stainless steel, tungsten, tantalum, etc.) having a wire diameter of 0.05-0.5 mm. The pitch of the spring structures may or may not be substantially uniform, e.g. the pitch of the spring structures increases gradually from the proximal end towards the distal end, so that the distal end of the spring structures more easily bypasses the target object 200 (see fig. 12 d).

In other embodiments, the spring structure may be replaced by a cut structure that is a tubular structure with cut grooves, e.g., the cut grooves may be helical, dumbbell-shaped, elongated, corrugated, etc., and may be obtained by laser cutting, etc. The bending stiffness of each region of the guide portion 42 can be varied by adjusting the pitch, number and cutting width of the slits, for example, the guide portion 42 can be made to have a first region and a second region located at the proximal end of the first region, the bending stiffness of the first region being smaller than the bending stiffness of the second region.

The distal (or head) end of the guide 42 is also provided with a raised formation 43. The material used for the bump structure 43 may be one or more selected from metal, polymer or inorganic nonmetallic materials, for example, nickel-titanium alloy, ceramic, PTFE, PET and other harder materials, and silica gel and other soft materials may be used. The raised structures 43 may be directly attached to the guides 42 by welding, heat staking, entanglement, bonding, or the like. The raised structures 43 may be spherical, hemispherical, drop-shaped, etc., with rounded distal ends. To facilitate the bypassing of the guide 42 around the target object, the distal end of the raised structure 43 may be provided with a smooth outer surface by polishing, coating with a biocompatible smooth coating, or the like. In addition, the protruding structure 43 may be a solid structure or a hollow structure, and the hollow structure is beneficial to reducing the weight of the head end and preventing the head end of the guiding portion 42 from being excessively inclined compared with the pushing section due to excessive weight.

In other embodiments, the protrusion 43 may be rotatably coupled to the guide 42 to further enhance the ability of the guide 42 to bypass an obstruction. Illustratively, the distal end of the guide 42 defines a receiving slot (not shown) for receiving the projection 43 and is rotatable in a plurality of directions within the receiving slot after it is snapped into the receiving slot, the projection 43 having a diameter greater than the opening diameter of the receiving slot to prevent the projection 43 from falling out of the receiving slot but being free to rotate within the receiving slot.

The pushing part 41 is an elongated rod or an elongated wire, and the material used may be one or more of metal and polymer. For example, nickel-titanium alloy, stainless steel, polyester, silica gel, etc. may be selected. The pushing portion 41 may be a hollow structure or a solid structure.

In other embodiments, the guide section and/or the projection 43 may be omitted, and the pushing portion 41 may have a first section and a second section located at the proximal end of the flexible section, the first section having a bending stiffness less than the second section.

It will be appreciated that the present invention is not limited to the number of locking elements 40, and may be one or more, and when there are a plurality of locking elements 40, a plurality of second lumens may be provided within the pushing element 31, each of which accommodates one locking element 40 therein, so that the plurality of locking elements 40 may be threaded out from different positions of the distal opening of the pushing element 31, thereby improving the efficiency of forming a locking space with the first capturing element 21 and/or the second capturing element 22. In other embodiments, the locking member 40 may not be disposed in the second lumen, but may be slidably disposed in the first lumen.

Referring to fig. 9, the steering assembly includes a handle 32, a first control member 33, a second control member 34, and a grip 35. The first control member 33 is connected with the pushing member 31 and can drive the pushing member 31 and the capturing portion 20 to move axially relative to the catheter 10, and the second control member 34 is connected with the locking member 40 and can drive the locking member 40 to move axially relative to the catheter 10 and the capturing portion 20.

The distal end of the handle 32 is connected to the proximal end of the catheter 10 (e.g., by an adhesive, heat staking, or the like) and the proximal end of the handle 32 is fixedly connected to the grip 35. The handle 35 is used for facilitating the gripping by the operator and performing the relevant control operations.

Referring to fig. 10 and 11, the handle 32 has a housing cavity 321 therein, and two sliding grooves 36 (see fig. 1) communicating the housing cavity 321 with the outside are formed in a side wall of the housing cavity, and the two sliding grooves 36 extend in the axial direction of the handle 32 and are disposed at intervals in the circumferential direction of the handle 32.

Both the first control member 33 and the second control member 34 are slidably connected to the handle 32, the first control member 33 being closer to the distal end of the retrieval device 100 than the second control member 34. Wherein, the first control member 33 and the second control member 331 each comprise a control member 331, a connecting member 333, and a locking unit 37.

The control body 331 is sleeved on the outer peripheral surface of the handle 32 and can slide relative to the handle 32. The outer contour of the cross section of the control body 331 (i.e., the cross section perpendicular to the axial direction) is substantially circular, and in other embodiments, the outer contour of the cross section of the control body 331 may also be elliptical, quadrilateral, or any other suitable shape. For convenience of operation, the control body 331 is further provided with a recess unit 332, and the recess unit 332 forms an annular groove along the circumference of the control body 331, the annular groove is recessed toward the direction close to the handle 32, and the operator can conveniently place the hand in the recess area to slide the control body 331. In other embodiments, the recessed region 332 may be a groove of other shapes, for example, the recessed region 332 may form an arcuate groove along the circumference of the control body 331, or any other suitable shape. In other embodiments, the number of the recess units 332 is not limited to one, and may be plural.

The first control member 33 and the second control member 34 of the present embodiment each include two connecting members 333, and each connecting member 333 is disposed in a corresponding sliding slot 36 in a penetrating manner, and is slidable along the corresponding sliding slot 36 relative to the handle 32. One end of the connecting member 333 of the first control member 33 is connected (e.g., fixedly connected) to the control body 331, and the other end is located in the accommodating cavity 321 and connected (e.g., fixedly connected) to the pushing member 31. When the control body 331 of the first control member 33 is subjected to an axial external force, the pushing member 31 is driven by the connecting member 333 to move in a proximal or distal direction relative to the handle 32 and the catheter 10. The connecting member 333 of the second control member 34 has one end connected (e.g., fixedly connected) to the control body 331 and the other end located in the accommodating cavity 321 and connected (e.g., fixedly connected) to the locking member 40 penetrating from the pushing member 31. When the control body 331 of the second control member 34 is subjected to an axial external force, the locking member 40 is driven by the connecting member 333 to move in a proximal or distal direction relative to the handle 32, the pushing member 31 and the catheter 10. In the present embodiment, the second control member 34 further includes a slider 334 disposed in the accommodating cavity 321, the slider is substantially cylindrical, and the slider 334 is respectively connected (e.g. fixedly connected) with the locking member 40 and the connecting member 333, and the slider 334 is disposed to facilitate driving the locking member 40 to slide smoothly.

It will be appreciated that in other embodiments, the number of connectors 333 may be one or greater than two. In addition, the pushing member 31 and the connecting member 333 may be connected to each other by a slider 334 in the first control member 33. In other embodiments, the slider 334 in the second control member 34 may be omitted and the catheter 10 may be directly connected to the connector 333.

The control main body 331 is provided with a control hole, the control hole penetrates through the side wall of the control main body 331, the control hole is provided with an inner orifice positioned on the inner surface of the control main body 331 and an outer orifice positioned on the outer surface of the control main body 331, and a first thread is arranged in the control hole. The locking unit 37 includes an operation section 371 and a locking section 372, and the operation section 371 has a substantially disk shape, and may have any suitable shape such as a circular shape, an elliptical shape, a triangular shape, a quadrangular shape, and the like in cross section. The maximum width of the operation section 371 (i.e., the dimension in the direction perpendicular to the length direction of the locking unit 37) is larger than the width of the outer aperture. The locking segment 372 is approximately cylindrical, one end of the locking segment 372 is fixedly connected with the operating segment 371, the other end of the locking segment 372 is a locking end and is arranged in the control hole, and a second thread matched with the thread is arranged on the locking segment 372. The operator can move the locking unit 37 along the control hole relative to the control body 331 by rotating the operation section 371, the locking end can move toward the handle 32 when the operation section 371 is rotated in the first direction, and the locking end can move away from the handle 32 when the operation section 371 is rotated in the second direction. When the locking end is moved to abut against the outer surface of the handle 32, and the abutting force is formed to be sufficiently large, the control body 331 and the handle 32 are locked (or locked) with each other, the control body 331 cannot axially move relative to the handle 32, and when the locking end is separated from the handle 32, the locking relationship (or unlocked) of the control body 331 and the handle 32 is released, and the control body 331 can axially move relative to the handle 32. In other embodiments, the first thread and the second thread may be omitted, one or more limiting holes may be formed in the handle 32, when the locking end is inserted into the limiting hole, the control body 331 and the handle 32 are locked to each other, the control body 331 cannot move axially relative to the handle 32, and when the locking end is separated from the limiting hole, the locking relationship between the control body 331 and the handle 32 is released.

When the locking unit 37 of the first control member 33 is locked, the first control member 33 cannot drive the pushing member 31 and the capturing portion 20 to move axially relative to the catheter 10. When the capturing portion 20 is in the second state, the locking unit 37 of the first control member 33 may be locked, so that the second state may be maintained to facilitate the subsequent control locking member 40 to be inserted into the first capturing member 21 and/or the second capturing member 22 to lock the target object. When the locking unit 37 of the second control member 34 is locked, the second control member 34 cannot drive the locking member 40 to move axially relative to the catheter 10, the pushing member 31 and the capturing portion 20, so as to facilitate maintaining the locking member 40 penetrating the first capturing member 21 and/or the second capturing member 22. It will be appreciated that in other embodiments, the locking unit 37 within the first control member 33 and/or the second control member 34 described above may be omitted.

Referring to fig. 12a to 12e, a method for recovering an electrode lead 200 of a cardiac implantable medical device using the recovery device 100 of the present embodiment is specifically described below, and includes:

step one: the recovery device 100 is placed in a loading state in which the first control member 33 and the second control member 34 are located at the initial positions, and the first control member 33 and the second control member 34 are both locked with the handle 32, and the catching portion 20 and the locking member 40 are both located within the catheter 10.

Step two: the capturing portion 20 is delivered to a position close to the electrode lead 200 through the catheter 10, the locking of the first control member 33 and the handle 32 is released, and the first control member 33 is controlled to slide distally until the first capturing member 21 and the second capturing member 22 of the capturing portion 20 are in the first state.

Step three: the movement of the first control member 33 is continuously controlled so that the electrode wire 200 is positioned between the first catching member 21 and the second catching member 22.

Step four: the first control member 33 is controlled to slide proximally so that the first capturing member 21 and the second capturing member 22 are gradually compressed into the catheter 10 from the proximal end to the distal end, and the first capturing member 21 and the second capturing member 22 are pressed by the opening of the catheter 10 so that the portions located outside the catheter 10 are close to each other until the first capturing member 21 and the second capturing member 22 form a crossing configuration, and at this time, the first capturing member 21 and the second capturing member 22 are in the second state, thereby preventing the electrode lead 200 from being pulled out from the distal end of the capturing portion 20. To maintain this second state, the first control member 33 is locked with the handle 32. In other embodiments, the first control member 33 and the second control member 34 may be unlocked relative to the handle 32, and the first control member 33 and the second control member 34 may be kept stationary to push the catheter 10 distally, so that the first capturing member 21 and the second capturing member 22 may be gradually compressed into the catheter 10 from the proximal end to the distal end.

Step five: the second control member 34 is unlocked from the handle 32, and the second control member 34 is controlled to move towards the distal end of the chute 36, so that the locking member 40 is driven to move towards the distal end until penetrating into the first capturing member 21 and/or the second capturing member 22 to form a locking space with the first capturing member 21 and/or the second capturing member 22, and the electrode wire 200 is enclosed in the locking space, and is in a third state at this time, in the third state, the distal end of the locking member 40 is further away from the distal end of the catheter 10 than the distal end of the capturing portion 20.

Step six: the locking of the first control member 33 and the handle 32 is released, the first control member 33 and the second control member 34 are controlled to move toward the proximal end of the chute 36 until the capturing portion 20, the locking member 40 and the electrode wire 200 are completely loaded into the catheter 10, and then the recovery device 100 is withdrawn from the body to complete the recovery of the electrode wire 200.

It will be appreciated that the recycling methods may vary with the structure of the recycling apparatus 100, and those skilled in the art may select an appropriate recycling method according to the specific application scenario and the structure of the recycling apparatus 100.

The first capturing element 21 and the second capturing element 22 of the recycling device 100 of the present embodiment have the second state, so that the target object can be limited in the locking space 20a therebetween, the size of the locking space 20a is adjustable, and the first capturing element 21 and the second capturing element 22 can form a clamping force on the target object by reducing the size of the locking space 20a, so that the target object can be firmly limited between the first capturing element 21 and the second capturing element 22, and firm capturing can be realized; in addition, when in the second state, the locking member 40 can more conveniently and efficiently penetrate through at least one of the first capturing member 21 and the second capturing member 22, so as to be matched with the first capturing member 21 and/or the second capturing member 22 to lock the target object, particularly in the second state, the distal ends of the first capturing member 21 and the second capturing member 22 are surrounded to form a third through hole 25, and when the locking member 40 penetrates through the third through hole 25 in the axial direction, the locking member 40 can be simultaneously penetrated into the first capturing member 21 and the second capturing member 22 and can be matched with the first capturing member 21 and the second capturing member 22 to lock the target object. Therefore, the recovery device 100 of the present embodiment can capture the electrode lead 200 efficiently and firmly, thereby greatly reducing the operation time and improving the success rate of the operation.

In another embodiment, the capturing part 20 includes a plurality of pairs of first capturing pieces 21 and second capturing pieces 22, the plurality of pairs of first capturing pieces 21 and second capturing pieces 22 being arranged in the circumferential direction, each pair of first capturing pieces 21 and second capturing pieces 22 being disposed opposite to each other in the radial direction. This is advantageous to further increase the efficiency of the locking member 40 in cooperation with the first capturing member 21 and/or the second capturing member 22 for locking the target object. Further, when in the first state, the axial lengths of the first capturing element 21 and the second capturing element (the axial length of the object refers to the distance between the radial plane where the proximal end of the object is located and the radial plane where the distal end of the object is located) are not equal; and/or, when in the second state, the crossing position of each pair of the first catch member 21 and the second catch member 22 in the axial direction (i.e., the position where the common area of the first through hole 23 and the second through hole 24 is located in the second state) is different. The arrangement makes the capturing portion 20 suitable for capturing target objects with various widths (or diameters), and is beneficial to shortening the withdrawing stroke required by the capturing portion 20 to form the clamping force on the target object, so as to improve the capturing efficiency.

In another embodiment, the capturing part 20 includes one first capturing element 21 and a plurality of second capturing elements 22 paired with the same first capturing element 21; alternatively, the capturing section 20 includes one second capturing piece 22 and a plurality of first capturing pieces 21 paired with the same second capturing piece 22; alternatively, the capturing portion 20 includes a plurality of first capturing pieces 21 and a plurality of second capturing pieces 22, and any of the first capturing pieces 21 can be paired with any of the second capturing pieces 22. In the first state, when there are a plurality of first catching pieces 21, the inclination angles of the respective first catching pieces 21 with respect to the central axis of the catching part 20 are the same or different, and when there are a plurality of second catching pieces 22, the inclination angles of the respective second catching pieces 22 with respect to the central axis of the catching part 20 are the same or different. The above-mentioned inclination angle refers to the angle between the line connecting the proximal end and the distal end of the capturing element and the central axis of the capturing portion 20. When the inclination angles of the plurality of first capturing members and/or the plurality of second capturing members 22 are different, the capturing portion 20 can be suitable for capturing target objects with various widths (or diameters), and is beneficial to shortening the retracting stroke required by the capturing portion 20 to form the clamping force on the target object, thereby improving the capturing efficiency.

In another embodiment, the capturing portion 20 further includes a third capturing member located on the same side in the radial direction as the first capturing member 21, the third capturing member includes an annular structure having a fourth through hole, the fourth through hole is disposed opposite to the orifice of the second through hole 24 in the radial direction when in the first state, the second capturing member 22 penetrates from one side of the fourth through hole, and the distal end of the second capturing member 22 penetrates from the other side of the fourth through hole when in the second state, so that the crossing position of the third capturing member and the second capturing member 22 located at the most distal end is closer to the distal end of the capturing portion 20 than the crossing position of the first capturing member 21 and the second capturing member 22 located at the most distal end. The arrangement makes the capturing portion 20 suitable for capturing target objects with various widths (or diameters), and is beneficial to shortening the withdrawing stroke required by the capturing portion 20 to form the clamping force on the target object, so as to improve the capturing efficiency.

In another embodiment, the first state and the second state may be switched by other means. This embodiment differs from the previous embodiment in that when the capturing portion 20 is completely released from the catheter 10 in the second state, the control portion 30 further comprises a pull wire connected to the capturing portion 20, and the pull wire can drive the first capturing member 21 and/or the second capturing member 22 to move so that the first capturing member 21 and the second capturing member 22 in the second state are separated from each other and are switched to the first state. In this embodiment, the pushing member 31 may be omitted, the capturing portion 20 may be connected to the distal end of the catheter 10, and the capturing portion 20 may be pushed by the catheter 10 to the vicinity of the target object.

In another embodiment, at least one deformable developing member is provided between the first catch member 21 and the second catch member 22, as compared to the previous embodiments. Illustratively, the developing member is a long strip-shaped structure having two ends, and is made of a developable metal material or polymer material, for example, one metal or alloy material of gold, tantalum, platinum, tungsten, iridium, iron, magnesium, a polyester material containing a developable compound such as iohexol, iopatanol, diatrizamine, or the like. The two ends of the developing member are respectively connected with the first capturing member 21 and the second capturing member 22, when the developing member is in the first state, the whole developing member is in a straight line shape, and when a certain position between the two ends of the developing member is acted by an axial external force, the whole developing member is in a non-straight line shape. Alternatively, the developing member may be curved in a manner to project distally as a whole when in the first state, and may be curved in a manner to project proximally as a whole when an axially outward force is applied at a position between the opposite ends of the developing member. The advantage of this arrangement is that even if the current contrast angle is as shown in fig. 7, it can be determined whether the target object is captured between the first capturing element 21 and the second capturing element 22 by the shape change of the developing element, and no switching to other contrast angles is required, which is advantageous for improving capturing efficiency.

Further, when in the first state, both end portions of the developing member may be located on the same cross section of the catching portion 20, or both end portions of the developing member may not be located on the same cross section of the catching portion 20, and when both end portions of the developing member are located on different cross sections of the catching portion 20, it may be easier for an operator to recognize a change in shape of the developing member.

Further, the developing member has an elastic section, which may be formed by spatial spiral or planar folding of single or multi-strand wires, for example. The elastic section can be directly connected with the first capturing element 21 and the second capturing element 22, and can also be connected with the first capturing element 21 and the second capturing element 22 through the connecting section, and the bending rigidity of the elastic section is smaller than that of the connecting section, so that the developing element can be well deformed when being pressed by a target object, and can well maintain the initial form even if being impacted by blood when not being pressed by the target object.

The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The above examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention.

Claims (10)

1. An intracorporeal implant retrieval device, characterized by: the device comprises a capturing part, a control part and a locking piece, wherein the capturing part comprises a first capturing piece and a second capturing piece which can move relatively, the first capturing piece and the second capturing piece are in a first state of being separated from each other to form an opening for a target object to enter between, the first capturing piece and the second capturing piece are close to each other to form a second state of limiting the target object, and at least one through hole is formed in the first capturing piece and the second capturing piece which are close to each other in the second state;

the control part is connected with the capturing part and used for controlling the first capturing part and the second capturing part to switch between the first state and the second state;

the locking piece is movable relative to the capturing part and is provided with a locking space which is inserted into at least one through hole and forms a target object containing space between the first capturing piece and/or the second capturing piece.

2. The intracorporeal implant retrieval device of claim 1, wherein: also included is a catheter having a first lumen extending in an axial direction; the control part comprises a pushing part which is arranged in the first inner cavity in a penetrating way and can move relative to the catheter along the axial direction, and the distal end of the pushing part is connected with the capturing part;

under the driving action of the pushing piece, the capturing part can deform under the action of the acting force of the catheter, and the pushing piece drives the catheter to axially move so as to control the first capturing piece and the second capturing piece to switch between the first state and the second state.

3. An intracorporeal implant retrieval device according to claim 1, wherein: the through holes comprise a first through hole arranged on the first capturing piece and a second through hole arranged on the second capturing piece, when the first capturing piece and the second capturing piece are in a second state, the first through hole and the second through hole are at least partially overlapped to form a third through hole, and the locking piece penetrates through the third through hole.

4. An intracorporeal implant retrieval device according to claim 1, wherein: the through holes comprise second through holes arranged on the second capturing pieces, when the first capturing pieces and the second capturing pieces are in a second state, the distal end sections of the first capturing pieces penetrate into the second through holes, so that the distal end sections of the first capturing pieces are at least partially positioned on the outer sides of the second capturing pieces to form first out-of-reach sections, and/or the distal end sections of the second capturing pieces are at least partially sleeved outside the first capturing pieces to form second out-of-reach sections.

5. An intracorporeal implant retrieval device according to claim 1, wherein: the first capturing piece and/or the second capturing piece are/is provided with a convex structure which is far away from the central axis direction of the capturing part, and the convex structure is at least partially positioned at the far end section of the first capturing piece and/or the second capturing piece.

6. An intracorporeal implant retrieval device according to any one of claims 1-5, wherein: the first and second catch members are at least partially constructed of a shape memory material.

7. An intracorporeal implant retrieval device according to claim 2, wherein: the locking piece is of an elongated structure and penetrates through the first inner cavity or penetrates through the second inner cavity extending along the axial direction in the pushing piece, and the locking piece can slide relative to the capturing part in the axial direction.

8. An intracorporeal implant retrieval device according to claim 7, wherein: the locking piece comprises a pushing part and a guiding part connected with the distal end of the pushing part, and the guiding part is at least partially made of elastic materials.

9. An intracorporeal implant retrieval device according to claim 2, wherein: the control part also comprises a locking unit; when the first capturing piece and the second capturing piece are in the second state, the locking unit locks the pushing piece so that the pushing piece cannot slide in the axial direction, and when the locking unit releases the locking of the pushing piece, the pushing piece can slide in the axial direction.

10. An intracorporeal implant retrieval device according to claim 1, wherein: the developing device is characterized by further comprising a developing piece, wherein two ends of the developing piece are respectively connected with the first capturing piece and the second capturing piece, when the first capturing piece and the second capturing piece are in a first state, the developing piece is in a straight line shape, and when the developing piece is acted by axial external force, the developing piece is in a non-straight line shape.