Recovery device

Abstract

This invention relates to a retrieval device, comprising: a capture assembly including a locking wire, a first capture wire and a second capture wire in an annular shape, the locking wire being attached to the first capture wire and axially movable relative to the first capture wire; and a control assembly connected to the capture assembly and used to control the capture assembly to switch between an initial state and a locked state. In the initial state, the distal end of the first capture wire, together with the distal end of the locking wire, is radially separated from the second capture wire, forming a capture space with an opening between the first and second capture wires. In the locked state, the locking wire and the first capture wire extend from the inside of the second capture wire to the outside of the second capture wire, and at least the locking wire intersects with the distal end of the second capture wire, closing the opening of the capture space. The retrieval device according to this invention can efficiently and securely capture electrode wires, significantly reducing surgical time and improving the success rate of surgery.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and more particularly to a recycling device. Background Technology

[0002] With the increasing number of implanted cardiac medical devices such as pacemakers, implantable cardioverter defibrillators, and cardiac resynchronization therapy, related complications such as lead breakage and lead wear are also increasing year by year, leading to a rapid increase in the demand for lead retrieval. Currently, there are two main methods for lead retrieval: the first is to remove the lead through open-chest surgery, which has disadvantages such as high surgical costs and significant trauma. The second method is intravenous interventional lead retrieval. Under angiographic conditions, the retrieval device is delivered intravenously to the lead location, then captures and loads the lead to be retrieved. Finally, the lead is withdrawn from the body along with the retrieval device, completing the lead retrieval. While this method has advantages such as low cost and minimal trauma, the continuous heartbeat during the procedure often causes the lead to move with the heartbeat, making it difficult for the retrieval device to efficiently and securely capture the lead. Summary of the Invention

[0003] The purpose of this invention is to at least solve the problem of recycling devices struggling to efficiently and securely capture electrode wires. To address the shortcomings of existing technologies, a recycling device is provided.

[0004] The technical problem solved by this invention is achieved through the following technical solution:

[0005] This invention provides a recovery device for capturing and recovering target objects within a biological body. The recovery device includes: a capture assembly comprising a locking wire, a first capture wire, and a second capture wire, the first and second capture wires being respectively annular in structure, the locking wire being attached to the first capture wire and axially movable relative to the first capture wire; and a control assembly connected to the capture assembly and used to control the capture assembly to switch between an initial state and a locked state. In the initial state, the distal end of the first capture wire, together with the distal end of the locking wire, is radially separated from the second capture wire, forming a capture space with an opening between the first and second capture wires. In the locked state, the locking wire and the first capture wire extend from the inside of the second capture wire to the outside of the second capture wire, and at least the locking wire intersects with the distal end of the second capture wire, closing the opening of the capture space.

[0006] In some embodiments of the present invention, the locking wire includes a first segment and a second segment extending axially, the distal end of the first segment extending from one side of the first capturing wire to the other side of the first capturing wire, and the second segment connecting to the distal end of the first segment and folding towards the proximal end to wrap the first capturing wire between the first segment and the second segment.

[0007] In some embodiments of the present invention, in the initial state, the distal end of the locking wire is connected to the first capture wire; in the locked state, the distal end of the locking wire is separated from the first capture wire, and along the axial direction, the distal end of the locking wire is spaced apart from the first capture wire and the second capture wire, respectively, and the distal end of the locking wire is closer to the distal end of the retrieval device than the first capture wire and the second capture wire.

[0008] In some embodiments of the present invention, the capture assembly further has a closed state between the initial state and the locked state. In the closed state, the distal end of the locking wire is connected to the first capture wire, and the locking wire and the first capture wire pass through from the inside of the second capture wire to the outside of the second capture wire. The distal ends of the locking wire and the first capture wire cross the distal end of the second capture wire together, thus closing the opening of the capture space. The control assembly is also used to control the capture assembly to switch between the initial state, the closed state, and the locked state.

[0009] In some embodiments of the present invention, the circumference of the first capture wire is greater than or equal to the circumference of the second capture wire; in the locked state, the distal end of the first capture wire intersects with the distal end of the second capture wire to close the opening of the capture space, and the first segment or the second segment is clamped between the distal ends of the first capture wire and the distal ends of the second capture wire along the radial direction.

[0010] In some embodiments of the present invention, the circumference of the first capture wire is smaller than the circumference of the second capture wire; in the locked state, the distal ends of the first capture wire and the distal ends of the second capture wire are spaced apart along the axial direction, and the locking wire closes the opening of the capture space.

[0011] In some embodiments of the present invention, the distal end of the first capture wire is provided with a curved section, the curved section being recessed into the interior of the first capture wire, and the distal end of the locking wire is wrapped around the curved section; and / or, the first capture wire includes a first core wire and a second core wire, the distal end of the first core wire being connected to the distal end of the second core wire, the first core wire having a first concave portion, the second core wire having a second concave portion, the first concave portion and the second concave portion being recessed towards the inner side of the first capture wire along the radial direction.

[0012] In some embodiments of the present invention, a locking ring sleeve is further included, the locking ring sleeve being fixed to the first capture wire, the locking wire passing through the locking ring sleeve and being slidable relative to the locking ring sleeve along the axial direction; the capture assembly also has a closed state between the initial state and the locked state, in which the distal end of the locking wire is connected to the first capture wire, the locking wire and the first capture wire passing through from the inside of the second capture wire to the outside of the second capture wire, the distal ends of the locking wire and the first capture wire crossing the distal end of the second capture wire together and closing the opening of the capture space; when in the closed state, the distal end of the locking ring sleeve is flush with the distal end of the second capture wire, or, when in the closed state, the distal end of the second capture wire is closer to the proximal end of the retrieval device than the distal end of the locking ring sleeve.

[0013] In some embodiments of the invention, along the axial direction and from the proximal end to the distal end, the first capture wire includes a first portion and a second portion connected together, the maximum radial dimension of the first portion being greater than the maximum radial dimension of the second capture wire, the maximum radial dimension of the second portion being less than the maximum radial dimension of the second capture wire, and the dimension of the second portion gradually decreasing along the radial direction from the proximal end to the distal end.

[0014] In some embodiments of the present invention, the diameter of the second portion is smaller than the diameter of the first portion, or the diameter of the second portion is greater than or equal to the diameter of the first portion; and / or the length of the first capture wire along the axial direction is smaller than the length of the second capture wire along the axial direction.

[0015] In some embodiments of the present invention, the control component includes: a pusher, the distal end of which is connected to the first capture wire and the second capture wire respectively; a sheath movably sleeved outside the pusher; wherein the first segment and the second segment are movably inserted inside the sheath, and the free ends of the first segment and the second segment are exposed outside the proximal end of the sheath.

[0016] According to the recovery device proposed in this invention, the capture assembly, due to its locking state, can confine the target object within the capture space between it and the object. The size of this capture space is adjustable. By reducing the size of the capture space, the first and second capture wires can form a clamping force on the target object, thereby firmly confining the target object between the first and second capture wires. The locking wire intersects with the distal end of the second capture wire, causing the locking wire to close the opening of the capture space. The locking wire further shares the resistance exerted on the recovery device by the target object when recovering it, so that the first, second, and locking wires pull the electrode wires together, achieving a firm capture.

[0017] It should also be noted that, since the distal end of the locking wire is attached to the first capture wire, when the first capture wire and the second capture wire cross, the first capture wire will drive the locking wire to cross with the second capture wire together. Therefore, after the crossing is completed, it is only necessary to push the locking wire to the distal end to successfully lock the wire, thus improving the success rate of the operation.

[0018] Therefore, the recovery device of the present invention can efficiently and firmly capture the electrode wires, greatly reducing the operation time and improving the success rate of the operation. Attached Figure Description

[0019] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. Wherein:

[0020] Figure 1a This is a schematic diagram of the recycling device in its initial state from the main viewpoint of Embodiment 1 of the present invention;

[0021] Figure 1b This is a partial structural schematic diagram of the recycling device in a closed state from the main viewpoint of Embodiment 1 of the present invention;

[0022] Figure 1c This is a partial structural schematic diagram of the recycling device in the locked state from the main viewpoint of Embodiment 1 of the present invention;

[0023] Figure 2a This is a top-view schematic diagram of a partial structure of the recovery device in its initial state according to Embodiment 1 of the present invention.

[0024] Figure 2b This is a partial structural schematic diagram of the recovery device in the closed state from a top view of Embodiment 1 of the present invention;

[0025] Figure 2c This is a partial structural schematic diagram of the recovery device in the locked state from a top view of Embodiment 1 of the present invention;

[0026] Figure 3a This is a partial structural diagram of the recovery device in its initial state, viewed from the upper left corner, according to Embodiment 1 of the present invention.

[0027] Figure 3b This is a partial structural schematic diagram of the recovery device in a closed state, viewed from the upper left corner, according to Embodiment 1 of the present invention.

[0028] Figure 3c This is a partial structural schematic diagram of the recovery device in the locked state from the upper left perspective of Embodiment 1 of the present invention;

[0029] Figure 4 It shows Figure 1a Schematic diagram of the cross-sectional structure of the middle BB section;

[0030] Figure 5a This is a schematic diagram of the recycling device in its initial state from the main viewpoint of Embodiment 2 of the present invention;

[0031] Figure 5b This is a partial structural schematic diagram of the recycling device in a closed state from the main viewpoint of Embodiment 2 of the present invention;

[0032] Figure 5c This is a partial structural schematic diagram of the recycling device in the locked state from the main viewpoint of Embodiment 2 of the present invention;

[0033] Figure 6a This is a partial structural diagram of the recovery device in its initial state, viewed from the lower left corner, according to Embodiment 2 of the present invention.

[0034] Figure 6b This is a partial structural schematic diagram of the recovery device in a closed state, viewed from the upper left corner, according to Embodiment 2 of the present invention.

[0035] Figure 7a This is a partial structural diagram of the recovery device in its initial state from a bottom-view perspective according to Embodiment 2 of the present invention;

[0036] Figure 7b This is a partial structural diagram of the recovery device in a closed state from a bottom-view perspective according to Embodiment 2 of the present invention;

[0037] Figure 8a It shows Figure 5a A schematic diagram of the cross-sectional structure of the CC section;

[0038] Figure 8b It shows Figure 5b A schematic diagram of the cross-sectional structure of the DD section;

[0039] Figure 9a This is a partial structural diagram of the recycling device in its initial state from the main viewpoint of Embodiment 3 of the present invention;

[0040] Figure 9b This is a partial structural schematic diagram of the recycling device in the locked state from the main viewpoint of Embodiment 3 of the present invention;

[0041] Figure 10a This is a top-view schematic diagram of the partial structure of the recovery device in its initial state according to Embodiment 3 of the present invention;

[0042] Figure 10bThis is a partial structural schematic diagram of the recovery device in the locked state from a top view of Embodiment 3 of the present invention;

[0043] Figure 11 This is a partial structural diagram of the recovery device in its initial state, viewed from the upper left corner, according to Embodiment 3 of the present invention.

[0044] Figure 12a This is a partial structural diagram of the recycling device in its initial state from the main viewpoint of Embodiment 4 of the present invention;

[0045] Figure 12b This is a partial structural schematic diagram of the recycling device in the locked state from the main viewpoint of Embodiment 4 of the present invention;

[0046] Figure 13 This is a top-view schematic diagram of a partial structure of the recovery device in its initial state according to Embodiment 4 of the present invention;

[0047] Figure 14a This is a partial structural diagram of the recovery device in its initial state, viewed from the upper left corner, according to Embodiment 4 of the present invention.

[0048] Figure 14b This is a partial structural diagram of the recovery device in the locked state from the upper left perspective of Embodiment 4 of the present invention;

[0049] Figure 15a This is a partial structural diagram of the recycling device in its initial state from the main viewpoint of Embodiment 5 of the present invention;

[0050] Figure 15b This is a partial structural schematic diagram of the recycling device in a closed state from the main viewpoint of Embodiment 5 of the present invention;

[0051] Figure 15c This is a partial structural schematic diagram of the recycling device in the locked state from the main viewpoint of Embodiment 5 of the present invention.

[0052] The labels in the attached diagram are as follows:

[0053] 100. Retrieval device; 101. Capture space; 102. First capture space; 103. Second capture space;

[0054] 10. Capture assembly; 11. Locking wire; 111. First segment; 112. Second segment;

[0055] 12. First capture wire; 121. First core wire; 1211. First segment; 1212. Second segment; 1213. Third segment; 1214. Fourth segment; 1215. First concave portion; 122. Second core wire; 1221. Second concave portion; 123. First part; 124. Second part; 1201. First through hole; 1202. Bent segment;

[0056] 13. Second capture wire; 131. Third core wire; 134. Fourth core wire; 1301. Second through hole;

[0057] 20. Control component; 21. Pushing component; 22. Sheath; 26. Fixing sleeve; 261. Guide section;

[0058] 31. Locking ring sleeve;

[0059] 200. Wire. Detailed Implementation

[0060] Exemplary embodiments of the invention will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the invention are shown in the drawings, it should be understood that the invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the invention and to fully convey the scope of the invention to those skilled in the art.

[0061] It should be understood that the terminology used herein is for the purpose of describing particular exemplary embodiments only and is not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms “a,” “an,” and “described” as used herein may also include the plural forms. The terms “comprising,” “including,” “containing,” and “having” are inclusive and therefore indicate the presence of the stated features, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein are not construed as requiring them to be performed in a particular order described or illustrated unless the order of performance is explicitly indicated. It should also be understood that additional or alternative steps may be used.

[0062] Although terms such as first, second, third, etc., may be used in this document to describe multiple elements, components, regions, layers, and / or segments, these elements, components, regions, layers, and / or segments should not be limited by these terms. These terms may be used only to distinguish one element, component, region, layer, or segment from another. Unless the context clearly indicates otherwise, terms such as "first," "second," and other numerical terms used herein do not imply order or sequence. Therefore, the first element, component, region, layer, or segment discussed below may be referred to as the second element, component, region, layer, or segment without departing from the teachings of the exemplary embodiments.

[0063] For ease of description, spatial relative terms may be used in the text to describe the relationship of one element or feature relative to another element or feature, as shown in the figure. These relative terms include, for example, "inside," "outside," "middle," "outer," "below," "below," "above," "over," etc. Such spatial relative terms are intended to include different orientations of the device in use or operation, other than those depicted in the figure. For example, if the device in the figure rotates, then an element described as "below other elements or features" or "below other elements or features" will subsequently be oriented "above other elements or features" or "above other elements or features." Therefore, the example term "below" can include both upper and lower orientations.

[0064] It should be noted that the terms "distal" and "proximal" are used as directional terms, which are commonly used in the field of interventional medical devices. "Distal" refers to the end furthest from the operator during the procedure, while "proximal" refers to the end closest to the operator. Axial direction refers to the direction parallel to the line connecting the center of the distal and proximal ends of the medical device; radial direction refers to the direction perpendicular to the aforementioned axial direction.

[0065] In this embodiment, combined with Figure 1a , Figure 1b and Figure 1c As shown, according to an embodiment of the present invention, a retrieval device 100 is provided. The retrieval device 100 can be used to remove elongated target objects, such as wires 200, guide wires, etc., from a living organism. For ease of understanding, this embodiment uses a wire 200 of a cardiac implantable medical device as an example of the target object.

[0066] The retrieval device 100 includes a capture assembly 10 and a control assembly 20. The capture assembly 10 includes a locking wire 11, a first capture wire 12, and a second capture wire 13. The control assembly 20 includes a pusher 21 and a sheath 22. Specifically, the sheath 22 has a hollow tubular structure, a proximal port, a distal port, and an internal cavity connecting the proximal and distal ports. The pusher 21 is a solid rod-shaped member or a hollow tubular member. The distal end of the pusher 21 is connected to the first capture wire 12 and the second capture wire 13, respectively. The sheath 22 is movably sleeved on the pusher 21. The first capture wire 12 and the second capture wire 13 are each annular in structure. The locking wire is attached to the first capture wire and can move axially relative to the first capture wire. By driving the pusher 21 to move relative to the sheath 22 in the axial direction, the pusher 21 can cause the distal ends of the first capture wire 12, the second capture wire 13 and the locking wire 11 to be released from the sheath 22, or to be stored inside the sheath 22.

[0067] Specifically, the locking wire 11, the first capturing wire 12, and the second capturing wire 13 are all made of wire-like devices with a certain degree of flexibility and strength. The first capturing wire 12 and the second capturing wire 13 are made of shape memory metal or polymer materials, such as nickel-titanium alloy or polymer materials with shape memory function, to ensure that they can stably maintain their shape under different conditions and can switch shapes. That is, the capturing assembly 10 has radial expansion capability, can achieve radial contraction under external force, and after the external force is removed, it self-expands or recovers to its naturally unfolded shape (also known as a fully unfolded shape) through mechanical expansion and maintains this naturally unfolded shape.

[0068] The control component 20 can control the capture component 10 to switch between an initial state (i.e., a naturally unfolded shape) and a locked state. In the initial state, the distal end of the first capture wire 12, together with the distal end of the locking wire 11, is radially separated from the second capture wire 13, forming a capture space 101 with an opening between the first capture wire 12 and the second capture wire 13, allowing the wire 200 to enter the capture space 101 through the opening. In the locked state, the locking wire 11 and the first capture wire 12 pass from the inside to the outside of the second capture wire 13, and at least the distal ends of the locking wire 11 and the second capture wire 13 intersect, closing the opening of the capture space 101, thereby locking the wire 200 inside the closed capture space 101.

[0069] It should be noted that since the distal end of the locking wire 11 is attached to the first capture wire 12, when the first capture wire 12 and the second capture wire 13 cross, the first capture wire 12 will drive the locking wire 11 to cross with the second capture wire 13. After the crossing is completed, the locking wire 11 only needs to be pushed to the distal end to successfully lock the wire, thus improving the success rate of the operation.

[0070] The connection method of the locking wire 11 to the first capture wire 12 can be configured in various ways. For example, the first capture wire 12 can have an axially extending through hole, and the locking wire 11 can extend axially and slidably pass through the through hole; another example is to use a connector with an axially sliding structure to attach the locking wire 11 to the first capture wire 12, with the connector fixedly disposed on the first capture wire 12, and the locking wire 11 extending axially and slidably connected to the slide rail structure; or, the locking wire 11 can be attached to the first capture wire 12 by wrapping it around the first capture wire 12. The following describes the solution of the present invention with reference to more specific embodiments.

[0071] Please refer to 1a to 1b. Figure 1c and Figure 3aThe locking wire 11 includes a first segment 111 and a second segment 112 extending axially, which are movably inserted into the sheath 22. Understandably, by driving the locking wire 11 to move axially relative to the pusher 21 and the sheath 22, the movement of the locking wire 11 can cause the first capturing wire 12 connected to the locking wire 11 to bend and deform relative to the pusher 21 and the second capturing wire 13, thereby changing the state of the capturing assembly 10. Alternatively, by driving the pusher 21 to move relative to the sheath 22, a radially inward compressive force can be applied to the first capturing wire 12 and the second capturing wire 13 through the distal end of the sheath 22, which can also change the shape and structure of the capturing assembly 10, thereby changing the state of the capturing assembly 10.

[0072] In this regard, please combine Figure 2a , Figure 2b and Figure 2c As shown, both the first capture wire 12 and the second capture wire 13 are configured as a ring structure. Both ends of the first capture wire 12 are fixedly connected to the pusher 21, and both ends of the second capture wire 13 are also fixedly connected to the pusher 21, making the first capture wire 12 and the second capture wire 13 and the pusher 21 a single unit. In this embodiment, the first capture wire 12 and the second capture wire 13 are located on opposite sides of the axis of the pusher 21. The direction of the first capture wire 12 and the second capture wire 13 towards the axis of the pusher 21 is defined as the direction towards the radially inward side, and the direction of the first capture wire 12 and the second capture wire 13 away from the axis of the pusher 21 is defined as the direction towards the radially outward side.

[0073] In this regard, please combine Figure 3a , Figure 3b and Figure 3c As shown, the annular structure of the first capture wire 12 encloses the first through hole 1201, and the annular structure of the second capture wire 13 encloses the second through hole 1301. The locking wire 11 is composed of a first segment 111 and a second segment 112 extending axially. The distal end of the first segment 111 can pass through one side of the first capture wire 12 and exit from the other side. That is, the first segment 111 is inserted into the first through hole 1201, and the second segment 112 is connected to the distal end of the first segment 111 and then folded towards the proximal end, thereby tightly wrapping the first capture wire 12 between the first segment 111 and the second segment 112.

[0074] In this embodiment, please refer to Figure 3a , Figure 3b and Figure 3cAs shown, the design of the distal end of the first segment 111 being able to enter from one side of the first capture wire 12 and exit from the other side includes two methods: one is that the distal end of the first segment 111 can enter from the inside of the first capture wire 12 and exit from the outside; the other is that the distal end of the first segment 111 can enter from the outside of the first capture wire 12 and exit from the inside.

[0075] In detail, the capture assembly 10 has an initial state and a locked state, and the control assembly 20 can control the capture assembly 10 to switch between the initial state and the locked state. The initial state is the naturally unfolded state of the capture assembly 10 after it is released from the sheath 22 and exposed at the distal end of the sheath 22, and is not subjected to external force.

[0076] When the capture assembly 10 is in its initial state, at least one distal segment of the first capture wire 12 and the second capture wire 13 exists, and this distal segment is an axial region of the capture assembly 10 (e.g., Figure 2a Region A in the diagram is an axial region that is closer to the distal end of the capture assembly 10 than the proximal ends of the first capture wire 12 and the second capture wire 13. In the first state, the distal sections of the first capture wire 12 and the second capture wire 13 are radially spaced apart and separated from each other. For example, the capture assembly 10 has at least one axial plane (i.e., a plane parallel to the central axis; in this invention, the virtual central axis of the pusher 21 is used as the central axis of the capture assembly 10). Within the distal section, the first capture wire 12 and the second capture wire 13 are located on opposite radial sides of this axial plane, thereby forming a capture space 101 with an opening between the first capture wire 12 and the second capture wire 13. During the capture of the wire 200, the first capture wire 12 and the second capture wire 13 are first released from the sheath 22 to bring the capture assembly 10 to its initial state, allowing the wire 200 to enter the capture space 101 through the opening.

[0077] When the capture assembly 10 is in the locked state, the distal ends of the locking wire 11 and the first capture wire 12 pass through the inside of the second capture wire 13 to the outside of the second capture wire 13. That is, the first segment 111, the second segment 112, and the first capture wire 12 are simultaneously passed through the second through hole 1301, so that the first capture wire 12 and the second capture wire 13 cross each other. The first segment 111 and the second segment 112 pass through the inside of the second capture wire 13 to the outside of the second capture wire 13, and the distal ends of the locking wire 11 and the second capture wire 13 cross each other. The opening of the capture space 101 is closed by the locking wire 11, or the opening of the capture space 101 is closed by the crossing of the distal ends of the first capture wire 12 and the second capture wire 13 and the crossing of the distal ends of the locking wire 11 and the second capture wire 13, thereby firmly locking the wire 200 inside the capture space 101. By utilizing the locking wire 11 to further reduce the resistance exerted on the retrieval device 100 by the target object during retrieval, the first grasping wire 12, the second grasping wire 13, and the locking wire 11 work together to pull the electrode wire 200, achieving a secure capture. Therefore, the retrieval device 100 of this invention can efficiently and securely capture the electrode wire 200, greatly reducing surgical time and improving the success rate of the surgery.

[0078] The recovery device 100 proposed in this invention has a capture space 101 with an opening in its initial state, which facilitates the entry of target objects and improves the success rate of capture. Compared with some traditional capture devices, it does not require very precise initial positioning to attempt to capture target objects, thus improving capture efficiency. In the locked state, the special structural relationship between the locking wire 11 and the first capture wire 12 and the second capture wire 13 forms a stable locking structure, making it difficult for the target object to escape from the capture space 101 after being captured. Even if it encounters certain resistance or tissue interference within the organism during the retraction process, it can still ensure the stable capture of the target object, improving the safety and reliability of the recovery process. Since the capture wire and locking wire 11 can be made of shape memory material, the recovery device 100 can adapt to target objects of different shapes and positions. Whether it is a straight electrode wire 200 or other target objects with a certain degree of curvature, it can be effectively captured and recovered through the shape adjustment of the capture wire and the action of the locking structure, thus broadening the application range of the device.

[0079] In some embodiments, please combine Figure 3a , Figure 3b and Figure 3cAs shown, when the capture assembly 10 is in the initial state, the distal end of the locking wire 11 is connected to the first capture wire 12. With this configuration, when the first capture wire 12 is bent and deformed radially toward the central axis under the action of external force and passes through the inner side of the second capture wire 13 to the outer side of the second capture wire 13, since the distal end of the locking wire 11 is connected to the first capture wire 12, the distal end of the locking wire 11 can pass through the second through hole 1301 together with the first capture wire 12 from the inner side to the outer side of the second capture wire 13.

[0080] When the capture assembly 10 is in the locked state, the distal end of the locking wire 11 is separated from the first capture wire 12, and along the axial direction, the distal end of the locking wire 11 is spaced apart from the first capture wire 12 and the second capture wire 13, and the distal end of the locking wire 11 is closer to the distal end of the recovery device 100 than the first capture wire 12 and the second capture wire 13. Understandably, after the locking wire 11 passes from the inside of the second capture wire 13 to the outside of the second capture wire 13, by pushing the locking wire 11 to move towards the distal end, the distal end of the locking wire 11 moves towards the more distal end after passing through the second through hole 1301 of the second capture wire 13, and increases the distance between the distal end of the locking wire 11 and the distal end of the second capture wire 13. This prevents the electrode wire 200 from bending and deforming under the tension of the guide wire when the wire 200 is pulled, thus effectively improving the strength of the locking structure formed between the first capture wire 12, the second capture wire 13 and the locking wire 11.

[0081] Please refer to this again. Figure 2a and Figure 4 As shown, in the first state, the first capture wire 12 and / or the second capture wire 13, viewed from the side, are both curved structures that are concave away from the central axis of the capture assembly 10 (in this invention, the virtual central axis of the pusher 21 is used as the central axis of the capture part), i.e., curved structures that are concave outward. The purpose of this arrangement is that when the first capture wire 12 and the second capture wire 13 are gradually compressed into the outer sheath 22 from the proximal end to the distal end, the portions located outside the outer sheath 22 can more easily approach each other in the radial direction to form an intersecting shape.

[0082] Furthermore, the capture assembly 10 also has a closed state between an initial state and a locked state. The closed state is a transitional form between the initial state and the locked state. When the capture assembly 10 is in the closed state, the distal end of the locking wire 11 is connected to the first capture wire 12. The locking wire 11 and the first capture wire 12 pass through the inside of the second capture wire 13 to the outside of the second capture wire 13. The distal ends of the locking wire 11 and the first capture wire 12 cross the distal end of the second capture wire 13 together, closing the opening of the capture space 101. Understandably, the capture assembly 10 can switch from the initial state to the closed state in two ways.

[0083] For example, in some embodiments, please combine Figure 3a , Figure 3b and Figure 3c As shown, the drive locking wire 11 moves relative to the pusher 21, and the locking wire 11 pulls the first capture wire 12 in the direction of the proximal end to change the shape of the annular structure of the first capture wire 12, so that the first capture wire 12 bends and deforms in the direction of the second capture wire 13, thereby changing the position of the distal ends of the first capture wire 12 and the second capture wire 13, thereby precisely controlling the relative position of the distal ends of the first capture wire 12 and the second capture wire 13, so that the capture assembly 10 changes from the initial state to a closed state in which the distal ends of the first capture wire 12 and the second capture wire 13 can cross. In this embodiment, it is necessary to ensure that the first segment 111 of the locking wire 11 passes from the inside of the first capture wire 12 to the outside of the first capture wire 12, and the part of the locking wire 11 extending inside the sheath 22 is located on both sides of the central axis of the pusher 21. The part of the locking wire 11 extending outward from the distal end of the sheath 22 first passes from the outside of the second capture wire 13 to the inside of the second capture wire 13. As the locking wire 11 continues to extend toward the distal end, the first segment 111 of the locking wire 11 passes from the inside of the first capture wire 12 to the outside of the first capture wire 12, while the second segment 112 does not pass through the first through hole 1201. The distal end of the second segment 112 bypasses the distal end of the first capture wire 12 and connects with the distal end of the first segment 111, so that the locking wire 11 wraps around the first capture wire 12. This configuration allows the locking wire 11 to apply a pulling force toward the proximal end to the first catching wire 12, with the pulling force having a radial component toward the inward (i.e. toward the central axis of the catching assembly 10) component, causing the first catching wire 12 to bend radially inward, ultimately achieving the intersection of the distal ends of the locking wire 11 and the first catching wire 12 with the distal end of the second catching wire 13.

[0084] For example, in some other embodiments, please refer to... Figure 10a , Figure 10b and Figure 11As shown, by controlling the relative position of the capture assembly 10 and the sheath 22, a closed state can be formed when the proximal portions of the first capture wire 12 and the second capture wire 13 are compressed into the outer sheath 22. In the closed state, the target object can be confined within the capture space 101 between the first capture wire 12 and the second capture wire 13, and the size of the capture space 101 is adjustable. By reducing the size of the capture space 101, the first capture wire 12 and the second capture wire 13 can form a clamping force on the target object, thereby firmly confining the target object between the first capture wire 12 and the second capture wire 13, achieving a secure capture. Furthermore, when in the closed state, by gradually compressing the first capture wire 12 and the second capture wire 13 into the interior of the sheath 22, the capture space 101 is gradually reduced, thereby allowing the first capture wire 12 and the second capture wire 13 to cooperate in locking the target object and preventing the electrode wire 200 from dislodging. Therefore, the electrode wire 200 can be captured efficiently and securely, greatly reducing the operation time and improving the success rate of the operation. In this embodiment, since the locking wire 11 does not actively apply tension to the first capturing wire 12 during the process of the capturing component 10 changing from the initial state to the closed state, the distal end of the locking wire 11 passes through the second through hole 1301 under the drive of the first capturing wire 12. Therefore, the part extending inside the sheath 22 where the locking wire 11 is located and the part extending outside the sheath 22 where the locking wire 11 is located can be arbitrarily set, without any restrictions. It is only necessary to satisfy that the first segment 111 of the locking wire 11 passes through the first through hole 1201, and the second segment 112 bypasses the distal end of the first capturing wire 12 and connects to the distal end of the first segment 111.

[0085] The control assembly 20 further includes a handle and a first control element (not shown) and a second control element (not shown) disposed on the handle (not shown in the figure). The distal end of the handle is connected to the proximal end of the sheath 22 (e.g., by welding, bonding, heat fusion, or other fixed connection methods). The handle is used for convenient gripping by the operator and for performing related control operations. The first and second control elements are respectively disposed on the handle, and both the first and second control elements are axially movable relative to the handle. The first control element is connected to the proximal end of the pusher 21. By driving the first control element to move axially on the handle, the pusher 21 can be moved axially relative to the sheath 22, thereby releasing the capture assembly 10 from inside the sheath 22 to outside the sheath 22, or retracting the capture assembly 10 from outside the sheath 22 back into the sheath 22. The second control member is connected to the proximal end of the locking wire 11. By driving the second control member to move axially toward the proximal end on the handle, the locking wire 11 can be moved axially toward the proximal end relative to the sheath 22. This movement of the locking wire 11 toward the proximal end applies a tension toward the proximal end to the first grasping wire 12, thereby switching the grasping assembly 10 from the initial state to the closed state. By driving the second control member to move axially toward the distal end on the handle, the locking wire 11 can be moved axially toward the distal end relative to the sheath 22, separating the distal end of the locking wire 11 from the first grasping wire 12, thereby switching the grasping assembly 10 from the closed state to the locked state.

[0086] The technical solution of the present invention will be further described in detail below with reference to specific embodiments.

[0087] Example 1

[0088] In this embodiment, combined with Figure 1a Figure 1b and Figure 1cAs shown, the circumference of the first capture wire 12 is greater than or equal to the circumference of the second capture wire 13. That is, the two ring structures formed by the first capture wire 12 and the second capture wire 13 are arranged radially with one larger and one smaller. Furthermore, the distal end of the locking wire 11 is connected to the distal end of the first capture wire 12. During the process of the capture assembly 10 changing from the initial state to the closed state, the locking wire 11 needs to be driven to move axially relative to the pusher 21 towards the proximal end, thereby applying force towards the distal end of the first capture wire 12 using the locking wire 11. The tension on the proximal side causes the first capture wire 12 to bend and deform under the pull of the locking wire 11, causing the distal end of the first capture wire 12 to move axially toward the proximal side and radially toward the second capture wire 13. This guides the distal end of the first capture wire 12 to pass through the second through hole 1301 from the inside of the second capture wire 13 and exit from the outside of the second capture wire 13, so that the distal ends of the first capture wire 12 and the second capture wire 13 intersect and close the opening of the capture space 101. It should also be noted that the distal end of the locking wire 11, along with the first capture wire 12, passes through the second through hole 1301 from the inside of the second capture wire 13 and exits from the outside of the second capture wire 13, so that the distal end of the locking wire 11 also intersects with the distal end of the second capture wire 13 and closes the opening of the capture space 101.

[0089] After the capture assembly 10 is switched to the closed state, the drive locking wire 11 moves axially relative to the pusher 21 toward the distal end, so that the distal end of the locking wire 11 is separated from the first capture wire 12. In the axial direction, the distal end of the locking wire 11 is spaced apart from the first capture wire 12 and the second capture wire 13, and the distal end of the locking wire 11 is closer to the distal end than the first capture wire 12 and the second capture wire 13. Furthermore, the pusher 21 is moved towards the proximal end relative to the sheath 22, causing the capture assembly 10 to be gradually retracted into the sheath 22 under the pull of the pusher 21. When the first capture wire 12 and the second capture wire 13 are gradually compressed into the outer sheath 22 from the proximal end to the distal end, the distal end of the sheath 22 applies a radially inward squeezing force to the first capture wire 12 and the second capture wire 13, causing the first capture wire 12 and the second capture wire 13 to continue moving towards each other in the radial direction. The capture space 101 gradually shrinks, causing the first capture wire 12 and the second capture wire 13 to clamp the wire 200 together, thereby firmly locking the wire 200 in the capture space 101. Finally, the capture assembly 10 switches from the closed state to the locked state.

[0090] Among them, in its naturally unfolded state, such as Figure 1a , Figure 2a , Figure 3a and Figure 4As shown, the maximum radial dimension of the first capture wire 12 is greater than the maximum radial dimension of the second capture wire 13, and the axial length dimension of the first capture wire 12 is greater than the axial length dimension of the second capture wire 13. Here, the radial dimension refers to the length dimension along the radial direction of the capture assembly, from the first side to the second side, that is, the dimension in the width direction.

[0091] In the closed state, such as Figure 1b , Figure 2b and Figure 3b As shown, when the first capture wire 12 is inserted into the second through hole 1301, the second capture wire 13 applies an inward squeezing force to the first capture wire 12. The interaction force between the first capture wire 12 and the second capture wire 13 is configured such that, during the process of pushing the locking wire 11 to the distal end to switch the capture assembly 10 from the closed state to the locked state, the first capture wire 12 and the second capture wire 13 can remain in the closed state and relatively stationary, so that the locking wire 11 can be smoothly pushed to the distal end, extending from the inside to the distal end of the second capture wire 13 through the second through hole 1301 of the second capture wire 13.

[0092] It should be noted that in the locked state, such as Figure 1c , Figure 2c and Figure 3c As shown, the second segment 112 is radially clamped between the distal end of the first capture wire 12 and the distal end of the second capture wire 13. If a certain resistance or tissue interference within the organism is encountered during the retraction process, causing the wire 200 to exert a large pulling force on the capture assembly 10, the second segment 112, being inserted between the distal ends of the first capture wire 12 and the second capture wire 13, can prevent the distal end of the first capture wire 12 from re-exiting from the second through hole 1301. This ensures that the distal ends of the first capture wire 12 and the second capture wire 13 remain in a crossed state, improving the stability of the capture assembly 10 in the locked state.

[0093] Furthermore, to ensure the stability of the connection between the locking wire 11 and the distal end of the first capture wire 12, the distal end of the first capture wire 12 is provided with a curved section 1202, which is recessed inwards towards the interior of the first capture wire 12, and the distal end of the locking wire 11 is wrapped around the curved section 1202. The concave direction of the curved section 1202 is, in the axial direction, from the distal end to the proximal end, and in the radial direction, from the outer side to the inner side of the first capture wire 12. Because the locking wire 11 has a U-shaped structure with a closed distal end and an open proximal end, and the portion of the locking wire 11 extending inside the sheath 22 is located on both sides of the central axis of the pusher 21, the portion of the locking wire 11 extending outward from the distal end of the sheath 22 first passes through the outer side of the second capture wire 13 to the inner side of the second capture wire 13. As the locking wire 11 continues to extend toward the distal end, the first segment 111 of the locking wire 11 passes through the inner side of the first capture wire 12 to the outer side of the first capture wire 12, while the second segment 112 does not pass through the first through hole 1201. The distal end of the second segment 112 bypasses the distal end of the first capture wire 12 and connects with the distal end of the first segment 111, so that the locking wire 11 is wrapped around the curved section 1202. This configuration ensures that when the pull wire 11 applies tension to the first capture wire 12, the tension applied by the pull wire 11 to the curved section 1202 is consistent with the concave direction of the curved section 1202. This keeps the distal end of the pull wire 11 within the concave structure formed by the curved section 1202, preventing the distal end of the pull wire 11 from slipping off the distal end of the first capture wire 12 and ensuring the stability of the connection between the distal ends of the pull wire 11 and the first capture wire 12.

[0094] like Figure 3a and Figure 4 As shown, the first capture wire 12 includes a first core wire 121 and a second core wire 122 arranged symmetrically on an axis. The distal end of the first core wire 121 is connected to the distal end of the second core wire 122, and the proximal ends of the first core wire 121 and the second core wire 122 are respectively connected to the pusher 21. The second capture wire 13 includes a third core wire 131 and a fourth core wire 134 arranged symmetrically on an axis. The distal end of the third core wire 131 is connected to the distal end of the fourth core wire 134, and the proximal ends of the third core wire 131 and the fourth core wire 134 are respectively connected to the pusher 21.

[0095] Reference Figure 2a and Figure 4 For example, from the proximal end to the distal end, the first core filament 121 extends in a direction away from each other and then bends to extend in a direction closer to each other, and converges at the distal end to form a petal-shaped or teardrop-shaped ring structure. From the proximal end to the distal end, the second core filament 122 and the fourth core filament 134 extend in a direction away from each other and then bends to extend in a direction closer to each other, and converge at the distal end to form a petal-shaped or teardrop-shaped ring structure.

[0096] In other embodiments, the first capturing wire 12 and the second capturing wire 13 can be formed into any other suitable shape, such as an ellipse, a circle, a rhombus, or a triangle. The third core wire 131 and the fourth core wire 134 can be formed into any other suitable shape, such as an ellipse, a circle, a rhombus, or a triangle. The first capturing wire 12 and the second capturing wire 13 are made of solid or hollow wire, which can be made of shape memory metal materials (e.g., nickel-titanium alloy, nickel-titanium-tantalum alloy, etc.) and / or shape memory polymer materials, or of materials with developing function, such as platinum core nickel-titanium wire. The wire can be made of a single wire or multiple wires wound together. In other embodiments, the wire can be made of materials such as stainless steel or other elastic materials. The first capturing wire 12 and the second capturing wire 13 are integrally formed. In other embodiments, the first capturing wire 12 and the second capturing wire 13 can be made separately and then jointly installed at the distal end of the pusher 21.

[0097] The annular structures of the first capture wire 12 and the second capture wire 13 can be the same or different. For example, in the initial state, the distal end of the first capture wire 12 is arranged in a roughly W-shape, and the distal end of the second capture wire 13 is arranged in a roughly inverted U-shape. This arrangement makes it easier for the distal end of the first capture wire 12 to be inserted into the second capture wire 13 under the pulling action of the locking wire 11.

[0098] In this embodiment, as Figure 1b As shown, the retrieval device 100 also includes a fixing sleeve 26, which is sleeved around the pusher 21 and located at the distal end of the pusher 21. The proximal ends of the first capture wire 12 and the second capture wire 13 are clamped and fixed between the fixing sleeve 26 and the pusher 21, thereby realizing the connection between the first capture wire 12 and the second capture wire 13 and the pusher 21. The proximal end of the fixing sleeve 26 is provided with a guide portion 261. The diameter of the guide portion 261 gradually decreases from the distal end to the proximal end, so as to facilitate the smoother retraction of the fixing sleeve 26, together with the first capture wire 12 and the second capture wire 13, into the sheath tube 22 during the retraction of the pusher 21.

[0099] It should be emphasized that, in this embodiment, as Figure 1c , Figure 2c and Figure 3cAs shown, the first capture wire 12 and the second capture wire 13 work together to lock onto the target object, and the first segment 111 of the locking wire 11 passes between the distal end of the first capture wire 12 and the distal end of the second capture wire 13, ensuring that the capture assembly 10 remains locked, thereby preventing the target object from escaping. Therefore, during retraction, the three components—the first capture wire 12, the second capture wire 13, and the locking wire 11—jointly pull the wire 200 to form a stable three-dimensional capture structure. The first capture wire 12 and the second capture wire 13 restrict the wire 200 from different directions. By utilizing the combined force of the two capture wires and the locking wire, the first capture wire 12, the second capture wire 13, and the locking wire 11 can distribute the pulling force, avoiding the situation where the first or second capture wire breaks due to the pulling force being concentrated on a certain device. It can also ensure that the wire 200 is firmly grasped during the pulling process from multiple angles, which greatly enhances the stability of the capture, efficiently and firmly captures the electrode wire 200, greatly reduces the operation time, and improves the success rate of the operation.

[0100] Example 2

[0101] The differences between Example 2 and Example 1 will be described below. The similarities or similarities between Example 2 and Example 1 will not be repeated here.

[0102] Please combine Figure 5a , Figure 5b , Figure 5c and Figure 6a As shown, the first core wire 121 has a first concave portion 1215, and the second core wire 122 has a second concave portion 1221. The first concave portion 1215 and the second concave portion 1221 are respectively recessed radially toward the inner side of the first capture wire 12. When the capture assembly 10 is in the closed state, the third core wire 131 of the second capture wire 13 is inserted into the first concave portion 1215, and the fourth core wire 134 of the second capture wire 13 is inserted into the second concave portion 1221. When the locking wire 11 is released and the first capture wire 12 loses the tension of the locking wire 11, the first capture wire 12 can be held in place by the first concave portion 1215 and the second concave portion 1221, so that the first capture wire 12 and the second capture wire 13 remain in a distal cross state, thereby ensuring that the capture assembly 10 can maintain the stability of its overall shape in the closed state. When the first capture wire 12 and the second capture wire 13 are kept in the closed state, the distal ends of the first capture wire 12 and the distal ends of the second capture wire 13 are arranged radially apart, thereby ensuring that when the locking wire 11 is pushed to the distal end, the first segment 111 of the locking wire 11 can pass through the gap between the distal ends of the first capture wire 12 and the distal ends of the second capture wire 13, so that the capture assembly 10 completes the transition from the closed state to the locked state.

[0103] In this embodiment, please refer to Figure 8a and Figure 8bAlong the radial direction, the capture assembly 10 has a first side and a second side located on both sides of the central axis of the capture assembly 10. The first capture wire 12 and the second capture wire 13 include a left-side section extending radially from the central axis of the capture assembly 10 to the first side. The first capture wire 12 and the second capture wire 13 also include a right-side section extending radially from the central axis of the capture assembly 10 to the second side. The first core wire 121 and the third core wire 131 are located in the left-side region, and the second core wire 122 and the fourth core wire 134 are located in the right-side region. In the initial state, the first core wire 121 and the third core wire 131 are separated radially, and the second core wire 122 and the fourth core wire 134 are separated radially.

[0104] Please combine Figure 6a , Figure 6b , Figure 7a , Figure 7b , Figure 8a and Figure 8b As shown, from the proximal end to the distal end, the first core wire 121 includes a first segment 1211, a second segment 1212, a third segment 1213 and a fourth segment 1214 connected in sequence. The proximal end of the first segment 1211 is connected to the pusher 21. From the proximal end to the distal end, the first segment 1211 extends from the central axis of the grasping assembly 10 in a direction away from the right side region, and the first segment 1211 also extends in a direction away from the second grasping wire 13. The second segment 1212 and the third segment 1213 together define the aforementioned first recess 1215. Specifically, the proximal end of the second segment 1212 is connected to the distal end of the first segment 1211. From proximal to distal, the second segment 1212 extends from the central axis of the capture assembly 10 towards the right-hand region, and also extends towards the second capture wire 13. This causes the second segment 1212 to bend relative to the first segment 1211 towards the side closer to the second capture wire 13 and towards the first through-hole 1201 of the first capture wire 12. The proximal end of the third segment 1213 is connected to the distal end of the second segment 1212. From proximal to distal, the third segment 1213 extends from the central axis of the capture assembly 10 towards the right-hand region, and also causes the second segment 1212 to extend away from the second capture wire 13. This causes the third segment 1213 to bend relative to the fourth segment 1214 towards the side away from the second capture wire 13. The proximal end of the fourth segment 1214 is connected to the distal end of the third segment 1213, and the distal end of the fourth segment 1214 is connected to the second segment 112. The structure of the second core wire 122 is the same as that of the first core wire 121, and will not be described again here.

[0105] Please see Figure 7a and Figure 8aAs shown, the first capture wire 12 is divided into two connected parts along the axial direction. The first part 123 includes a first segment 1211 and a second segment 1212, and the second part 124 includes a third segment 1213 and a fourth segment 1214. The maximum radial dimension of the first part 123 is greater than the maximum radial dimension of the second part 124, resulting in a structure where the second part 124 at the distal end is narrow and the first part 123 at the proximal end is wide. Here, the radial dimension refers to the length along the radial direction of the capture assembly, from the first side to the second side, i.e., in the width direction.

[0106] This configuration gives the recycling device 100 proposed in this invention several advantages: First, during the transition from the initial state to the closed state, it facilitates the smoother passage of the distal end of the first capturing wire 12 (i.e., the second part 124) through the second through hole 1301 of the second capturing wire 13, allowing the distal ends of the first capturing wire 12 and the second capturing wire 13 to intersect; Second, a first recess 1215 and a second recess 1221 are formed in the region where the first part 123 and the second part 124 are connected. When in the closed state, the first... The second capture wire 13 will be engaged in the first recess 1215 and the second recess 1221, thereby maintaining the stability of the capture assembly 10 in the closed state; third, when the locking wire 11 is pushed to move to the far end, so that the capture assembly 10 changes from the closed state to the locked state, since the first part 123 has a large radial dimension, the first part 123 is constrained by the inner diameter of the second capture wire 13, which can prevent the first capture wire 12 from continuing to move towards the far end relative to the second capture wire 13 under the drive of the locking wire 11.

[0107] Furthermore, the diameter of the second part 124 is smaller than the diameter of the first part 123, meaning the diameters of the fourth segment 1214 and the third segment 1213 are smaller than the diameters of the second segment 1212 and the first segment 1211. Since the second core wire 122 has the same structure as the first core wire 121, the distal portion of the first capturing wire 12 (i.e., the second part 124) is more flexible than the proximal portion (i.e., the first part 123), while the first part 123 provides better support than the second part 124. This configuration allows the second part 124 of the first capturing wire 12 to bend and deform more easily during the transition from the initial state to the closed state of the capturing assembly 10, smoothly entering the second through hole 1301 and crossing the distal end of the second capturing wire 13. The good support performance of the first part 123 helps the first capturing wire 12 and the second capturing wire 13 maintain stability in the closed state.

[0108] In other embodiments, the diameter of the second portion 124 is greater than or equal to the diameter of the first portion 123, and the flexibility of the second portion 124 is greater than that of the first portion 123. In this embodiment, the second portion 124 may be made of a different material than the first portion 123 to make the flexibility of the second portion 124 greater than that of the first portion 123. Alternatively, a grooved structure or a hollow structure may be provided in the second portion 124 to make the flexibility of the second portion 124 greater than that of the first portion 123. The purpose is to make the second portion 124 of the first grasping wire 12 more easily bend and deform during the process of the grasping assembly 10 switching from the initial state to the closed state, and smoothly pass into the second through hole 1301 and cross the distal end of the second grasping wire 13. The good support performance of the first portion 123 helps the first grasping wire 12 and the second grasping wire 13 remain stable in the closed state.

[0109] Example 3

[0110] The differences between Example 3 and Examples 1 and 2 will be described below. The similarities or similarities between Example 3 and Examples 1 and 2 will not be repeated here.

[0111] Please combine Figure 9a , Figure 9b , Figure 10a , Figure 10b and Figure 11 As shown, along the axial direction and from the proximal end to the distal end, the first capture wire 12 includes a connected first portion 123 and a second portion 124. In this embodiment, as shown in FIG10, the maximum radial dimension of the first portion 123 is greater than the maximum radial dimension of the second portion 124, resulting in a structure where the second portion 124 at the distal end is narrow and the first portion 123 at the proximal end is wide. Here, the radial dimension refers to the length dimension along the radial direction of the capture assembly from the first side to the second side, i.e., the dimension in the width direction.

[0112] The maximum radial dimension of the first part 123 is greater than the maximum radial dimension of the second capture wire 13, and the maximum radial dimension of the second part 124 is less than the maximum radial dimension of the second capture wire 13. Furthermore, the radial dimension of the second part 124 gradually decreases from the proximal end to the distal end. This arrangement facilitates the smoother passage of the distal end of the first capture wire 12 (i.e., the second part 124) through the second through-hole 1301 of the second capture wire 13 during the transition from the initial state to the closed state, allowing the distal ends of the first capture wire 12 and the second capture wire 13 to intersect. Furthermore, as the locking wire 11 moves to the distal end to change the capture assembly 10 from a closed state to a locked state, the first part 123 has a larger radial dimension and is constrained by the inner diameter of the second capture wire 13, thus better maintaining the crossed shape. In addition, the circumference of the first capture wire 12 can be longer than that of the second capture wire 13, which not only allows for better interlocking but also enables the first capture wire 12 to also function as the locking wire 11 after interlocking, thereby improving the overall strength of the device.

[0113] Furthermore, the process of the capture assembly 10 changing from the initial state to the closed state requires the drive push rod to move towards the proximal end relative to the sheath 22, so that the first capture wire 12 and the second capture wire 13 are gradually retracted into the sheath 22 under the drive of the pusher 21. That is, by controlling the relative position of the capture assembly 10 and the sheath 22, when the proximal part of the first capture wire 12 and the proximal part of the second capture wire 13 are compressed into the outer sheath 22, the capture assembly 10 switches from the initial state to the closed state.

[0114] In this embodiment, the distal end of the first capture wire 12 does not have a curved section 1202, making the distal end of the first capture wire 12 a U-shaped structure bulging towards the distal end. Furthermore, the axial length of the first capture wire 12 is smaller than the axial length of the second capture wire 13, such that the distal end of the first capture wire 12 is radially opposite to the second through hole 1301 of the second capture wire 13. With this configuration, when the sheath 22 compresses and bends the first capture wire 12 and the second capture wire 13 radially inward, since the distal end of the first capture wire 12 is opposite to the second through hole 1301 of the second capture wire 13, the distal end of the first capture wire 12 can directly pass through the second through hole 1301, allowing the distal ends of the first capture wire 12 and the second capture wire 13 to intersect. Furthermore, as... Figure 9b and Figure 10bAs shown, since the circumference of the first capture wire 12 is greater than that of the second capture wire 13, when both the first capture wire 12 and the second capture wire 13 are in a compressed state, the axial length of the first capture wire 12 is greater than that of the second capture wire 13. This allows the distal end of the first capture wire 12 to pass through the second through hole 1301 and extend towards the distal end when the first capture wire 12 and the second capture wire 13 are in a crossed state. Furthermore, the distal end of the first capture wire 12 is closer to the distal end than the distal end of the second capture wire 13, thus maintaining a good crossed state between the first capture wire 12 and the second capture wire 13 and reducing the probability of the first capture wire 12 coming out of the second through hole 1301.

[0115] Example 4

[0116] The differences between Example 4 and Examples 1, 2 and 3 will be described below. The similarities or similarities between Example 4 and Examples 1, 2 and 3 will not be repeated here.

[0117] In this embodiment, please refer to Figure 12a , 12b, Figure 13 , Figure 14a and Figure 14b As shown, the circumference of the first capture wire 12 is smaller than that of the second capture wire 13. That is, the two annular structures formed by the first and second capture wires 12 and 13 are radially separated, one larger and one smaller. Furthermore, since the annular structure of the first capture wire 12 is smaller than that of the second capture wire 13, and in the initial state, the axial length of the first capture wire 12 is less than the axial length of the second capture wire 13, the distal end of the first capture wire 12 is radially aligned with the second through hole 1301. Therefore, it is not necessary to pull the locking wire 11 and apply tension to the first capture wire 12 to achieve the crossing of the first and second capture wires 13. The crossing can be achieved by driving the push rod relative to the sheath. 22 moves towards the proximal end so that the first capture wire 12 and the second capture wire 13 are gradually retracted into the sheath tube 22 under the drive of the pusher 21. That is, by controlling the relative position of the capture assembly 10 and the sheath tube 22, when the proximal part of the first capture wire 12 and the proximal part of the second capture wire 13 are compressed into the outer sheath tube 22, the compression of the sheath tube 22 causes the first capture wire 12 and the second capture wire 13 to bend and deform radially inward. Since the annular structure of the first capture wire 12 is smaller than the annular structure of the second capture wire 13, the distal end of the first capture wire 12 can directly pass through the second through hole 1301 so that the distal end of the first capture wire 12 and the distal end of the second capture wire 13 can cross.

[0118] After the capture assembly 10 is switched to the closed state, the drive locking wire 11 moves axially relative to the pusher 21 toward the distal end, so that the distal end of the locking wire 11 is separated from the first capture wire 12. In the axial direction, the distal end of the locking wire 11 is spaced apart from the first capture wire 12 and the second capture wire 13, and the distal end of the locking wire 11 is closer to the distal end than the first capture wire 12 and the second capture wire 13. Furthermore, the pusher 21 is moved towards the proximal end relative to the sheath 22, causing the capture assembly 10 to be gradually retracted into the sheath 22 under the pull of the pusher 21. When the first capture wire 12 and the second capture wire 13 are gradually compressed into the outer sheath 22 from the proximal end to the distal end, the distal end of the sheath 22 applies a radially inward squeezing force to the first capture wire 12 and the second capture wire 13, causing the first capture wire 12 and the second capture wire 13 to continue moving towards each other in the radial direction. The capture space 101 gradually shrinks, causing the first capture wire 12 and the second capture wire 13 to clamp the wire 200 together, thereby firmly locking the wire 200 in the capture space 101. Finally, the capture assembly 10 switches from the closed state to the locked state.

[0119] It should be noted that in this embodiment, please refer to... Figure 12b and Figure 14b As shown, since the first capture wire 12 is a small loop and the second capture wire 13 is a large loop, in the locked state, the distal end of the first capture wire 12 is located at the waist of the second capture wire 13, causing the distal end of the first capture wire 12 to intersect with the waist region of the second capture wire 13. That is, the distal end of the first capture wire 12 is axially spaced from the distal end of the second capture wire 13. This creates a first capture space 102 between the first capture wire 12 and the second capture wire 13 in the capture assembly 10, and a second capture space 103 between the locking wire 11 and the second capture wire 13. Furthermore, the first capture space 102 is nested within the second capture space 103, allowing the wire 200 to be captured in any region of either the first capture space 102 or the second capture space 103.

[0120] Specifically, when the wire 200 is captured in the first capture space 102, in the closed state, the target object can be confined within the first capture space 102 between the first capture wire 12 and the second capture wire 13. The size of the capture space 101 is adjustable. By reducing the size of the capture space 101, the first capture wire 12 and the second capture wire 13 can form a clamping force on the target object, thereby firmly confining the target object between the first capture wire 12 and the second capture wire 13, achieving a firm capture. In addition, when in the closed state, by gradually compressing the first capture wire 12 and the second capture wire 13 into the interior of the sheath tube 22, the first capture space 102 is gradually reduced, thereby allowing the first capture wire 12 and the second capture wire 13 to cooperate in locking the target object and preventing the target object from escaping.

[0121] If the resistance when pulling the wire 200 is too great, causing the wire 200 to come out of the first capture space 102, the wire 200 will enter the second capture space 103, where the second capture wire 13 and the locking wire 11 will pull the wire 200 together, thereby further reducing the probability of the wire 200 coming out of the capture assembly 10.

[0122] In this embodiment, since the locking wire 11 does not actively apply tension to the first capturing wire 12 during the process of the capturing component 10 changing from the initial state to the closed state, the distal end of the locking wire 11 passes through the first through hole 1201 under the drive of the first capturing wire 12. Therefore, the part extending inside the sheath tube 22 where the locking wire 11 is located and the part extending outside the sheath tube 22 where the locking wire 11 is located can be arbitrarily set, and there is no restriction here. It is only necessary to satisfy that the first segment 111 of the locking wire 11 passes through the first through hole 1201, and the second segment 112 bypasses the distal end of the first capturing wire 12 and is connected to the distal end of the first segment 111.

[0123] Example 5

[0124] The differences between Example 5 and Examples 1, 2, 3 and 4 will be described below. The similarities or similarities between Example 5 and Examples 1, 2, 3 and 4 will not be repeated here.

[0125] In this embodiment, please refer to Figure 15a , Figure 15b and Figure 15c As shown, the distal end of the first capture wire 12 does not have a curved section 1202. The first core wire 121 and the first core wire 121 extend in a direction away from each other and then bend and extend in a direction closer to each other, and meet and connect at the distal end to form a petal-shaped or teardrop-shaped ring structure. The distal end of the first capture wire 12 is roughly arranged in an inverted U-shape. The shape and structure of the second capture wire 13 are similar to those of the first capture wire 12.

[0126] The recovery device 100 also includes a locking ring sleeve 31, which is sleeved around the first segment 111 and the first capture wire 12. The first segment 111 is connected to the first capture wire 12 through the locking ring sleeve 31. Specifically, the locking ring sleeve 31 is fixedly disposed on the first capture wire 12 and is located near the distal end of the first capture wire 12. The second segment 112 of the locking wire 11 is slidably inserted into the locking ring sleeve 31, and the locking wire 11 is connected to the first capture wire 12 through the locking ring sleeve 31. In this embodiment, by using the locking ring sleeve 31 to constrain the connection position between the locking wire 11 and the first capture wire 12, the position where the locking wire 11 is connected to the first capture wire 12 is close to the far end of the first capture wire 12. Thus, when the first capture wire 12 passes through the second through hole 1301 of the second capture wire 13, it can be ensured that the locking wire 11 can pass through the second through hole 1301 of the second capture wire 13 together with the first capture wire 12. This avoids the locking wire 11 from slipping from the far end of the first capture wire 12 to other positions of the first capture wire 12 (such as the near end of the first capture wire 12), which would prevent the locking wire 11 from passing through the second through hole 1301 of the second capture wire 13, thus ensuring that the capture assembly 10 can perform effective capture. In this embodiment, effective capture means that, in the locked state, the locking wire 11 can pass through the inside of the second capture wire 13 to the outside of the second capture wire 13, and the second segment 112 is clamped between the far end of the first capture wire 12 and the far end of the second capture wire 13.

[0127] Understandably, when the capture assembly 10 switches from the initial state to the closed state, since the second segment 112 of the locking wire 11 is slidably inserted into the locking ring sleeve 31, the locking wire 11 can be pushed to the far end so that the locking wire 11 moves as a whole toward the far end, thereby causing the capture assembly 10 to change from the closed state to the locked state.

[0128] For example, in other embodiments, the locking ring sleeve 31 may also completely fix the second segment 112 to the first capture wire 12. When the capture assembly 10 switches from the initial state to the closed state, during the process of switching from the closed state to the locked state, the first segment 111 of the locking wire 11 is pushed to the distal end. Since the second segment 112 is fixedly connected to the locking ring sleeve 31 and the first capture wire 12, the position of the second segment 112 in the axial direction remains unchanged, and the first segment 111 moves toward the distal end, thereby causing the capture assembly 10 to change from the closed state to the locked state.

[0129] When in the closed state, the distal end of the locking ring sleeve 31 is flush with the distal end of the second grasping wire 13, or the distal end of the second grasping wire 13 is closer to the proximal end of the retrieval device 100 than the distal end of the locking ring sleeve 31. This arrangement allows the locking wire 11 to be pushed more smoothly to the distal end to successfully lock, forming a locked state after the lock is closed. It should be emphasized that the technical solution of this embodiment can be combined with any one of embodiments 1, 2, 3, and 4, and any technical solution that can be combined with any one of embodiments 1, 2, 3, and 4 is also covered within the protection scope of this invention.

[0130] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A recovery device for capturing and recovering target objects within a living organism, characterized in that, The recycling device includes: The capture assembly includes a locking wire, a first capture wire, and a second capture wire. The first capture wire and the second capture wire are respectively in a ring structure. The locking wire is attached to the first capture wire and can move axially relative to the first capture wire. A control component, connected to the capture component, is used to control the capture component to switch between an initial state and a locked state; In the initial state, the distal end of the first capture wire, together with the distal end of the locking wire, is radially separated from the second capture wire, forming a capture space with an opening between the first capture wire and the second capture wire; in the locked state, the locking wire and the first capture wire pass through from the inside of the second capture wire to the outside of the second capture wire, and at least the locking wire crosses the distal end of the second capture wire, closing the opening of the capture space.

2. The recycling device according to claim 1, characterized in that, The locking wire includes a first segment and a second segment extending axially. The distal end of the first segment passes from one side of the first capture wire to the other side of the first capture wire. The second segment is connected to the distal end of the first segment and folded towards the proximal end to wrap the first capture wire between the first segment and the second segment.

3. The recycling device according to claim 2, characterized in that, In the initial state, the distal end of the locking wire is connected to the first capture wire; in the locked state, the distal end of the locking wire is separated from the first capture wire, and along the axial direction, the distal end of the locking wire is spaced apart from the first capture wire and the second capture wire, respectively, and the distal end of the locking wire is closer to the distal end of the retrieval device than the first capture wire and the second capture wire.

4. The recycling device according to claim 3, characterized in that, The capture assembly also has a closed state between the initial state and the locked state. In the closed state, the distal end of the locking wire is connected to the first capture wire. The locking wire and the first capture wire pass through from the inside of the second capture wire to the outside of the second capture wire. The distal ends of the locking wire and the first capture wire cross the distal end of the second capture wire together and close the opening of the capture space. The control component is also used to control the capture component to switch between the initial state, the closed state, and the locked state.

5. The recycling device according to claim 3, characterized in that, The circumference of the first capture wire is greater than or equal to the circumference of the second capture wire; In the locked state, the distal end of the first capture wire crosses the distal end of the second capture wire to close the opening of the capture space, and the first segment or the second segment is clamped between the distal ends of the first capture wire and the distal ends of the second capture wire along the radial direction.

6. The recycling device according to claim 1, characterized in that, The circumference of the first capture wire is smaller than the circumference of the second capture wire; In the locked state, the distal ends of the first capture wire and the distal ends of the second capture wire are spaced apart along the axial direction, and the locking wire closes the opening of the capture space.

7. The recycling device according to claim 1, characterized in that, The distal end of the first capture wire is provided with a curved section, the curved section is recessed into the interior of the first capture wire, and the distal end of the locking wire is wrapped around the curved section. And / or, the first capture wire includes a first core wire and a second core wire, the distal end of the first core wire is connected to the distal end of the second core wire, the first core wire has a first concave portion, the second core wire has a second concave portion, and the first concave portion and the second concave portion are respectively recessed inward toward the inner side of the first capture wire along the radial direction.

8. The recycling device according to claim 1, characterized in that, It also includes a locking ring sleeve, which is fixed to the first capture wire, the locking wire passing through the locking ring sleeve and being able to slide relative to the locking ring sleeve along the axial direction; The capture assembly also has a closed state between the initial state and the locked state. In the closed state, the distal end of the locking wire is connected to the first capture wire. The locking wire and the first capture wire pass through from the inside of the second capture wire to the outside of the second capture wire. The distal ends of the locking wire and the first capture wire cross the distal end of the second capture wire together and close the opening of the capture space. When in the closed state, the distal end of the locking ring sleeve is flush with the distal end of the second capture wire, or, when in the closed state, the distal end of the second capture wire is closer to the proximal end of the retrieval device than the distal end of the locking ring sleeve.

9. The recycling apparatus according to any one of claims 1 to 8, characterized in that, Along the axial direction and from the proximal end to the distal end, the first capture wire includes a first portion and a second portion connected together, the maximum radial dimension of the first portion being greater than the maximum radial dimension of the second capture wire, the maximum radial dimension of the second portion being less than the maximum radial dimension of the second capture wire, and the dimension of the second portion gradually decreasing along the radial direction from the proximal end to the distal end.

10. The recycling device according to claim 9, characterized in that, The diameter of the second part is smaller than the diameter of the first part, or the diameter of the second part is greater than or equal to the diameter of the first part; And / or, the length of the first capture wire along the axial direction is smaller than the length of the second capture wire along the axial direction.

11. The recycling apparatus according to any one of claims 2 to 8, characterized in that, The control component includes: The pusher is connected at its distal end to the first capture wire and the second capture wire, respectively. The sheath is movably fitted over the pusher; The first segment and the second segment are movably inserted into the sheath, and the free ends of the first segment and the second segment are exposed outside the proximal end of the sheath.

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