Snare

Abstract

The utility model relates to the technical field of medical instruments, in particular to a snare which comprises a fixed handle and an outer sheathing canal, one end of the outer sheathing canal is rotatably connected with the butt joint end of the fixed handle, a semi-annular groove is formed in the peripheral wall of the outer sheathing canal, a rotating shaft is slidably arranged in the semi-annular groove, one end of the rotating shaft is located in a mounting cavity, and the other end of the rotating shaft is located in the mounting cavity. A chain wheel is arranged at one end in the mounting cavity, and a chain is arranged on the chain wheel; the inner sheath tube is arranged in the mounting cavity in a sleeving manner and is concentrically and rotatably arranged with the outer sheath tube; the end, away from the butt joint end, of the inner sheath tube is sleeved with a snake bone structure, the end, away from the inner sheath tube, of the snake bone structure is suspended, two rows of threading holes are oppositely formed in the peripheral wall of the snake bone structure, and the two free ends of the chain correspondingly penetrate through the two rows of threading holes to be connected with the edge of the suspended end of the snake bone structure. Pathological tissues can be cut off in any direction, the flexibility of the whole device in the using process is improved, and efficient operation is guaranteed.

Description

Technical Field

[0001] The present application relates to the technical field of medical devices, and in particular to a snare. Background Art

[0002] The snare is a medical device mainly used for endoscopic excision of diseased tissue with or without high-frequency electricity. At present, when using the snare, the diseased tissue is first found under the endoscope, the snare is inserted through the biopsy channel of the endoscope, the wire cutting ring is moved to the lesion position, and the handle is held while pushing the movable handle forward to open the wire cutting ring, and then the tissue is trapped, and the movable handle is pulled back to tighten the wire cutting ring to tighten the tissue and cut off the diseased tissue, or the tissue is cauterized by connecting the electrode to high-frequency electricity to cut off the diseased tissue. At present, when using a snare with this structure to excise diseased tissue, when the lesion is in an unfavorable position, the lesion is flat, or the tissue is small, it is difficult to snare or cannot reach the target site to completely excise the diseased tissue.

[0003] At present, some snares for gastroenteroscopy can rotate the wire cutting loop, but the front end cannot be bent. The exit of the front biopsy channel of the existing gastroenteroscopy is located below the front end of the scope (mostly at 5 to 7 o'clock at the front end of the insertion part). When the snare is used, it is located below the front field of view when it is extended from the front biopsy channel of the endoscope. When the snare is above the field of view, the technical difficulty of completely snare the lesion is relatively high by combining measures such as rotating the wire cutting loop angle, inhaling to reduce the gastrointestinal lumen, rotating and bending the front end of the endoscope. In particular, when the front end of the scope is located in the curved part of the digestive tract lumen, such as the duodenal bulb, descending duodenum, sigmoid colon, and ileocecal part, the front end of the endoscope is not easy to maintain stability. It is difficult to use the wire cutting loop to remove the lesion above the field of view by rotating and bending the front end of the endoscope, which is inconvenient for clinical use. Utility Model Content

[0004] In order to solve the above technical problem or partially solve the above technical problem, the present application provides a snare.

[0005] The present application provides a snare, comprising:

[0006] A fixed handle, comprising a pull ring end and a butt end; a receiving cavity is provided inside the fixed handle, and the receiving cavity opens at the end surface of the butt end;

[0007] An outer sheath tube, one end of which is rotatably connected to the butt end of the fixed handle, a mounting cavity is provided inside the outer sheath tube, and the mounting cavity is communicated with the accommodating cavity; a semi-annular groove is provided on the outer peripheral wall of the outer sheath tube, a rotating shaft is slidably provided in the semi-annular groove, one end of the rotating shaft is located inside the mounting cavity, and the other end is located outside the mounting cavity, a sprocket is provided on the end located inside the mounting cavity, and a chain is provided on the sprocket;

[0008] An inner sheath tube is sleeved in the installation cavity and is coaxially rotatably arranged with the outer sheath tube; a snake-bone structure is sleeved on one end of the inner sheath tube away from the butt end, and the snake-bone structure is suspended at one end away from the inner sheath tube; two rows of threading holes are arranged on the outer peripheral wall of the snake-bone structure; the two free ends of the chain pass through the two rows of threading holes and are connected to the edge of the suspended end of the snake-bone structure, and the two connections are symmetrical to each other; an insulating sleeve is coaxially arranged inside the inner sheath tube, and the end of the insulating sleeve away from the butt end passes through the inside of the snake-bone structure;

[0009] A rotating sleeve is provided at one end of the inner sheath tube away from the snake-bone structure, and the rotating shaft sleeve is arranged in the rotating sleeve and rotates with the rotating sleeve;

[0010] A movable handle is slidably mounted on the fixed handle along the axial direction of the fixed handle; a guide wire control rod is provided in the accommodating cavity, one end of the guide wire control rod is connected to the movable handle, and the other end is provided with a traction guide wire, and the end of the traction guide wire away from the guide wire control rod passes through the installation cavity and the insulating sleeve; a wire cutting ring is provided at the end of the traction guide wire passing through the insulating sleeve.

[0011] Optionally, an annular groove is provided on the end surface of the docking end of the fixed handle, and a clamping ring is provided on the end surface of one end of the outer sheath tube close to the docking end; the clamping ring is inserted into the annular groove and rotatably cooperates with the annular groove.

[0012] Optionally, a threaded hole is radially provided in the fixed handle, the threaded hole is communicated with the annular groove, and a top screw is screwed into the threaded hole; an annular cavity is provided on the outer peripheral wall of the clamping ring, and the annular cavity is limitedly matched with the top screw.

[0013] Optionally, a rotating disk is provided at one end of the rotating shaft located outside the outer sheath tube.

[0014] Optionally, a threading groove is provided on the outer wall of the inner sheath tube along the axial direction of the inner sheath tube for the chain to pass through.

[0015] Optionally, the inner sheath tube includes a sleeve ring, which is arranged at an end of the inner sheath tube away from the butt end, and the snake-bone structure is sleeved in the sleeve ring.

[0016] Optionally, the accommodating cavity is arranged to radially penetrate the fixed handle, and a conductive core is provided at one end of the guide wire control rod away from the movable handle, and the conductive core is electrically connected to the guide wire control rod.

[0017] Optionally, the insulating sleeve is made of insulating material.

[0018] Compared with the prior art, the technical solution provided by the embodiments of the present application has the following advantages:

[0019] In the present application, when encountering some complex scenarios, the rotating disk is rotated to drive the rotating shaft to rotate, and the sprocket on the rotating shaft rotates to drive the chain to move, and finally drives the bending of the snake-bone structure. The bending of the snake-bone structure enables the wire-cutting ring to complete the bending, so as to achieve the extraction of the diseased tissue. At the same time, by controlling the axial movement of the movable handle relative to the fixed handle, the diseased tissue can be removed. In addition, in this process, the rotating shaft can move laterally in the semi-annular groove relative to the outer sheath, so that the snake-bone structure can bend in different directions, so that the wire-cutting ring can extract the diseased tissue in different directions. When the fixed handle and the movable handle are controlled to rotate relative to the outer sheath, the plane where the wire-cutting ring is located will rotate with the traction guide wire position as the axis. For example, when the diseased tissue is located on the left side of the wire-cutting ring, the plane where the wire-cutting ring is located can be directed toward the diseased tissue for subsequent bending and extraction. The entire device has high flexibility and can more conveniently deal with some complex diseased tissues and scenarios where the diseased tissue is flat or small. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0021] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0022] Figure 1 This is an exploded schematic diagram of the overall structure of the snare according to the embodiment of the present application;

[0023] Figure 2 This is a cross-sectional view of the overall structure of the snare described in the embodiment of the present application;

[0024] Figure 3 It is a partial enlarged schematic diagram of the interior of one end of the fixed handle of the snare according to the embodiment of the present application where the fixed handle is connected to the outer sheath;

[0025] Figure 4 This is a schematic diagram of the lower structure of the outer sleeve of the snare in a three-dimensional state according to an embodiment of the present application;

[0026] Figure 5 It is a partial enlarged schematic diagram of the position of the sprocket in the snare described in the embodiment of the present application;

[0027] Figure 6 This is a schematic diagram of the cross-sectional structure of the snake bone structure in the snare according to the embodiment of the present application;

[0028] Figure 7 Schematic diagram of the snake bone structure in the snare described in the embodiment of the present application;

[0029] Figure 8 It is a schematic diagram of the state of the wire cutting ring in the snare described in the embodiment of the present application when it is bent on the snake bone structure;

[0030] Fig. 9 This is a schematic diagram of the state of the wire cutting ring in the snare described in the embodiment of the present application when the snake bone structure is horizontal;

[0031] Fig.10 This is a schematic diagram of the state of the wire cutting ring in the snare described in the embodiment of the present application when the snake bone structure is bent downward;

[0032] Fig.11 This is a schematic structural diagram of the wire cutting ring of the snare according to the embodiment of the present application when it is in a downwardly bent state;

[0033] Fig.12 This is a structural schematic diagram of the wire cutting ring of the snare according to the embodiment of the present application when it is bent to the left;

[0034] Fig.13 This is a schematic structural diagram of the wire cutting ring of the snare according to the embodiment of the present application when it is in an upwardly bent state;

[0035] Fig.14 This is a schematic structural diagram of the wire cutting ring of the snare described in an embodiment of the present application when it is bent to the right.

[0036] in,

[0037] 1. Fixed handle; 10. Threaded hole; 11. Accommodating cavity; 12. Guidewire control rod; 120. Conductive insert; 13. Annular groove; 2. Movable handle; 3. Outer sheath; 30. Rotating shaft; 31. Rotating disk; 32. Sprocket; 33. Snap ring; 330. Annular cavity; 35. Semi-annular groove; 36. Rotating sleeve; 37. Connecting rod; 4. Wire cutting ring; 5. Pulling guidewire; 6. Insulating sleeve; 7. Inner sheath; 70. Sleeve ring; 71. Threading groove; 8. Snake bone structure; 80. Threading hole; 81 Sleeve connection part; 9. Chain. DETAILED DESCRIPTION

[0038] In order to more clearly understand the above-mentioned purposes, features and advantages of the present application, the scheme of the present application will be further described below. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0039] In the following description, many specific details are set forth to facilitate a full understanding of the present application, but the present application may also be implemented in other ways different from those described herein; obviously, the embodiments in the specification are only part of the embodiments of the present application, rather than all of the embodiments.

[0040] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0041] In the description of the embodiments of the present application, technical terms such as "first" and "second" are only used to distinguish different objects and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features.

[0042] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0043] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0044] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0045] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0046] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0047] Reference Figures 1 to 7 As shown, a snare provided in this embodiment includes: a fixed handle 1, including a pull ring end and a butt end; an accommodating cavity 11 is provided inside the fixed handle 1, and the accommodating cavity 11 is open at the end surface of the butt end.

[0048] The fixed handle 1 is a columnar structure as a whole. In this embodiment, one end of the fixed handle 1 is recorded as a pull ring end, and the other end is recorded as a docking end. The pull ring end is provided with an annular pull ring for the convenience of the operator.

[0049] A receiving cavity 11 is provided inside the fixed handle 1 to reduce the weight of the entire device and provide installation locations for other components; the receiving cavity 11 is open at the end face of the docking end of the fixed handle 1 to allow for components passing through the receiving cavity 11.

[0050] It also includes an outer sheath tube 3 and an inner sheath tube 7, one end of the outer sheath tube 3 is rotatably connected to the docking end of the fixed handle 1, an installation cavity is provided inside the outer sheath tube 3, and the installation cavity is communicated with the accommodating cavity 11; a semi-annular groove 35 is provided on the outer peripheral wall of the outer sheath tube 3, a rotating shaft 30 is movably provided in the semi-annular groove 35, one end of the rotating shaft 30 is located inside the installation cavity, and the other end is located outside the installation cavity, a sprocket 32 ​​is provided on the end located inside the installation cavity, and a chain 9 is provided on the sprocket 32; the inner sheath tube 7 is sleeved in the installation cavity, and can be It rotates concentrically relative to the outer sheath tube 3; a serpentine structure 8 is sleeved on one end of the inner sheath tube 7 away from the butt end, and the end of the serpentine structure 8 away from the inner sheath tube 7 is suspended, and two rows of threading holes 80 are relatively arranged on the outer peripheral wall of the serpentine structure 8, and the two free ends of the chain 90 respectively pass through the two rows of threading holes 80 and are connected to the edge of the suspended end of the serpentine structure 8, and the two connections are symmetrical to each other; an insulating sleeve 6 is concentrically arranged inside the inner sheath tube 7, and the end of the insulating sleeve 6 away from the butt end passes through the interior of the serpentine structure 8.

[0051] The outer sheath tube 3 is in a tubular structure, and one end thereof, namely the end facing the fixed handle 1 , is rotatably connected to the butt end of the fixed handle 1 . In addition, in the present embodiment, the outer sheath tube 3 is concentrically arranged with the fixed handle 1 .

[0052] An installation cavity is provided inside the outer sheath tube 3 , and the installation cavity is a columnar structure. When the outer sheath tube 3 is rotatably connected with the inner sheath tube 7 , the accommodating cavity 11 and the installation cavity will be communicated with each other.

[0053] Reference Figures 8 to 10 As shown, a semi-annular groove 35 is provided on the outer peripheral wall of the outer sheath tube 3, and a rotating shaft 30 is provided in the semi-annular groove 35, that is, one end of the rotating shaft 30 is located inside the mounting cavity, and the other end is located outside the mounting cavity. At the same time, a sprocket 32 ​​is provided on the end of the rotating shaft 30 located inside the mounting cavity, and a chain 9 is provided on the sprocket 32. The two free ends of the chain 9 respectively pass through two opposite rows of threading holes 80 on the serpentine structure 8, and are connected to the edge of one end of the serpentine structure 80 that is suspended. When the rotating disk 31 is rotated, the sprocket 32 ​​rotates through the conduction of the rotating shaft 30, so that the serpentine structure 8 connected to the chain 9 is bent, and when the rotating shaft 30 rotates in different directions, the serpentine structure 8 bends in opposite directions.

[0054] During this process, since the rotating shaft 30 is rotatably connected to the rotating sleeve 36 at the right end of the inner sheath tube 7, and the rotating sleeve 36 is connected to the inner sheath tube 7 through the connecting rod 37, when the rotating shaft 30 is moved to move laterally in the semi-annular groove 35, the connecting rod 37 drives the inner sheath tube 7 to rotate concentrically relative to the outer sheath tube 3, thereby causing the sprocket 32, chain 9, and snake bone structure 8 to rotate synchronously.

[0055] In this embodiment, the semi-annular groove 35 can be 180°. Since the snake-bone structure 8 can be bent in two directions, when the snake-bone structure 8 itself can rotate 180°, the snake-bone structure 8 can bend in any direction within 360°.

[0056] The snake-bone structure 8 is made of an insulating non-metallic material, or a metal material coated with an insulating material, to ensure that when the snare is powered on, it will not conduct electricity and burn surrounding tissues. The snake-bone structure 8 is relatively common in the mechanical field and is a prior art. When it does not rotate circumferentially, under the action of the chain, one end of it will bend relative to the other end, and there are only two opposite bending directions, that is, if it can bend relatively to the right, it can also bend relatively to the left, and if it can bend relatively forward, it can also bend relatively backward, thereby ensuring the controllability of the bending of the snake-bone structure 8.

[0057] In this embodiment, it is preferred that the maximum angle at which the snake-bone structure 8 can be bent on one side is 120°, and the angle can be kept stable in the bent state.

[0058] An insulating sleeve 6 is arranged inside the inner sheath tube 7. The insulating sleeve 6 can be bent freely, and the end away from the butt end passes through the inside of the snake-bone structure 8. When the snake-bone structure 8 is bent under the action of the chain 9, the snake-bone structure 8 will synchronously drive the insulating sleeve 6 inside it to bend.

[0059] It also includes a movable handle 2, which is axially slidably sleeved on the fixed handle 1; a guide wire control rod 12 is provided in the accommodating cavity 11, one end of the guide wire control rod 12 is connected to the movable handle 2, and the other end is provided with a traction guide wire 5, and the end of the traction guide wire 5 away from the guide wire control rod 12 passes through the installation cavity and the insulating sleeve 6; the end of the traction guide wire 5 passing through the insulating sleeve 6 is provided with a wire cutting ring 4.

[0060] The movable handle 2 moves relative to the fixed handle 1, that is, the movable handle 2 is sleeved on the fixed handle 1, and can move along the axial direction of the fixed handle 1 under the action of external force; a side wall of the movable handle 2 facing the docking end is connected to one end of the guide wire control rod 12, and the other end of the guide wire control rod 12 is connected to a traction guide wire 5, and the end of the traction guide wire 5 away from the guide wire control rod 12 passes through the installation cavity and the insulating sleeve 6, and a wire cutting ring 4 is provided on this end.

[0061] When the movable handle 2 is controlled to move axially relative to the fixed handle 1, the wire cutting ring 4 will extend out of the end of the inner sheath 7 away from the docking end or retract into the inner sheath 7. During this process, the wire cutting ring 4 will be acted upon by the snake-bone structure 8 on the inner sheath 7, which will cause the ring opening of the wire cutting ring 4 to become smaller, thereby removing the lesion.

[0062] The guide wire control rod 12 does not contact the inner wall of the accommodating chamber 11, and is a rod-shaped structure, which can transmit the thrust brought by the movable handle 2 without being restricted.

[0063] The sprocket 32 ​​and the rotating shaft 30 can be offset relative to the center of the outer sheath 3 to allow the guide wire 5 to pass through.

[0064] like Figures 11 to 14As shown, in the present application, when encountering some complex scenes, the bending of the serpentine structure 8 can be achieved by rotating the rotating disk 31 to rotate the rotating shaft 30, so that the wire cutting ring 4 can be bent to achieve the sleeve of the diseased tissue, and at the same time, by controlling the axial movement of the movable handle 2 relative to the fixed handle 1, the removal of the diseased tissue can be achieved. In addition, in this process, the rotating shaft 30 can move laterally relative to the outer sheath tube 3 in the semi-annular groove 35, and then drive the inner sheath tube 7 to rotate concentrically relative to the outer sheath tube 3 through the connecting rod 37, so that the sprocket 32, the chain 9, and the serpentine structure 8 rotate synchronously, so that The serpentine structure 8 can be bent in different directions to facilitate the cutting ring 4 to extract the diseased tissue in different directions; and when the outer sheath 3 is fixed and the fixed handle 1 and the movable handle 2 are controlled to rotate in the annular groove 13, the plane of the cutting ring 4 can rotate relative to the serpentine structure 8. For example, when the diseased tissue is located on the left side of the cutting ring 4, the plane of the cutting ring 4 can be made to face the diseased tissue for subsequent bending and extraction. The whole device has high flexibility and can more conveniently deal with some complexly located diseased tissues and scenarios where the diseased tissues are flat or small.

[0065] It should be noted that, in this embodiment, the outer sheath 3, the inner sheath 7, the traction guidewire 5 and the insulating sleeve 6 are all flexible to a certain extent and can be bent.

[0066] In some embodiments, an annular groove 13 is provided on the end surface of the docking end of the fixed handle 1, and a clamping ring 33 is provided on the end surface of the outer sheath tube 3 close to the docking end; the clamping ring 33 is inserted into the annular groove 13 and rotatably cooperates with the annular groove 13.

[0067] An annular groove 13 is provided on the end surface of the butt end and extends toward the pull ring end, and a clamping ring 33 is provided on the end surface of the outer sheath tube 3 near the butt end. The clamping ring 33 cooperates with the annular groove 13 to achieve rotational cooperation between the fixed handle 1 and the outer sheath tube 3.

[0068] In some embodiments, a threaded hole 10 is radially provided in the fixed handle 1, the threaded hole 10 is connected to the annular groove 13, and a top screw is screwed into the threaded hole 10; an annular cavity 330 is provided on the outer peripheral wall of the clamping ring 33, and the annular cavity 330 cooperates with the top screw to limit the position.

[0069] In order to ensure the axial cooperation between the fixed handle 1 and the outer sheath tube 3, a threaded hole 10 is radially arranged in the fixed handle 1, and a top screw is screwed into the threaded hole 10. At the same time, an annular cavity 330 is arranged on the outer peripheral wall of the clamping ring 33. When the clamping ring 33 is inserted into the annular groove 13, the top screw is rotated so that the top screw is fed toward the center of the fixed handle 1, so that it is just clamped in the annular cavity 330 in the clamping ring 33, thereby avoiding axial separation of the two while ensuring the normal rotation of the fixed handle 1 and the outer sheath tube 3.

[0070] In some embodiments, a rotating disk 31 is provided at one end of the rotating shaft 30 located outside the outer sheath tube 3. The rotating disk 31 is used to increase the convenience of rotation.

[0071] In some embodiments, a threading groove 71 is provided on the outer wall of the inner sheath tube 7 along the axial direction of the inner sheath tube 7 for the chain 9 to pass through.

[0072] In order to prevent the chain 9 from shaking or being disturbed, a threading groove 71 is provided on the outer wall of the inner sheath tube 7 . The threading groove 71 extends along the axial direction of the inner sheath tube 7 for the chain 9 to pass through.

[0073] The two rows of threading holes 80 on the snake-bone structure 8 correspond to the two threading grooves 71 on the inner sheath tube 7 .

[0074] In some embodiments, the inner sheath 7 includes a sleeve ring 70 , which is disposed at one end of the inner sheath 7 away from the butt end, and the snake structure 8 is sleeved in the sleeve ring 70 through a sleeve portion 81 .

[0075] The inner sheath tube 7 further comprises a sleeve ring 70 , which is integrally arranged with the inner sheath tube 7 , specifically arranged at one end of the inner sheath tube 7 away from the docking end. The outer diameter of the sleeve ring 70 is smaller than the outer diameter of the inner sheath tube 7 , and is used for sleeve connection of the snake bone structure 8 .

[0076] In some embodiments, the accommodating cavity 11 is radially arranged to penetrate the fixed handle 1 , and a conductive plug 120 is provided at one end of the guidewire control rod 12 away from the movable handle 2 , and one end of the conductive plug 120 is sleeved on the guidewire control rod 12 to achieve a sliding electrical connection with the guidewire control rod 12 .

[0077] The accommodating cavity 11 radially penetrates the fixed handle 1, and the conductive core 120 is arranged on the end of the guide wire control rod 12 away from the movable handle 2 to meet the maximum moving distance of the movable handle 2 relative to the fixed handle 1 and ensure that the conductive core 120 and the end of the accommodating cavity 11 close to the docking end will not interfere with each other.

[0078] The conductive core 120 is used to energize the traction guide wire 5 so that the wire cutting ring 4 can burn the diseased tissue under the action of high-frequency electricity to achieve auxiliary resection. The structure and principle of the conductive core 120 are relatively common and are prior art, and will not be repeated in this embodiment.

[0079] In some embodiments, the insulating sleeve 6 is made of insulating material and is resistant to high temperatures.

[0080] The above is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments described herein, but will conform to the widest scope consistent with the principles and novel features applied for herein.

Claims

1. A snare, characterized in that: include: A fixed handle (1) comprises a pull ring end and a butt end; a receiving cavity (11) is provided inside the fixed handle (1), and the receiving cavity (11) opens at the end surface of the butt end; An outer sheath tube (3), one end of the outer sheath tube (3) being rotatably connected to the butt end of the fixed handle (1), a mounting cavity being provided inside the outer sheath tube (3), and the mounting cavity being communicated with the accommodating cavity (11); a semi-annular groove (35) being provided on the outer peripheral wall of the outer sheath tube (3), a rotating shaft (30) being slidably provided in the semi-annular groove (35), one end of the rotating shaft (30) being located inside the mounting cavity, and the other end being located outside the mounting cavity, a sprocket (32) being provided on the end located inside the mounting cavity, and a chain (9) being provided on the sprocket (32); The inner sheath tube (7) is sleeved in the installation cavity and is arranged to rotate coaxially with the outer sheath tube (3); the end of the inner sheath tube (7) away from the butt end is sleeved with a snake bone structure (8), and the end of the snake bone structure (8) away from the inner sheath tube (7) is suspended, and two rows of threading holes (80) are arranged on the outer peripheral wall of the snake bone structure (8), and the two free ends of the chain (9) respectively pass through the two rows of threading holes (80) and are connected to the edge of the suspended end of the snake bone structure (8), and the two connection points are symmetrical to each other; the inner sheath tube (7) is coaxially provided with an insulating sleeve (6), and the end of the insulating sleeve (6) away from the butt end passes through the interior of the snake bone structure (8); A rotating sleeve (36) is provided at one end of the inner sheath tube (7) away from the snake bone structure (8), and the rotating shaft (30) is sleeved in the rotating sleeve (36) and rotates in cooperation with the rotating sleeve (36); A movable handle (2) is slidably sleeved on the fixed handle (1) along the axial direction of the fixed handle (1); a guide wire control rod (12) is provided in the accommodating cavity (11); one end of the guide wire control rod (12) is connected to the movable handle (2), and the other end is provided with a traction guide wire (5); the end of the traction guide wire (5) away from the guide wire control rod (12) passes through the installation cavity and the insulating sleeve (6); the end of the traction guide wire (5) passing through the insulating sleeve (6) is provided with a wire cutting ring (4).

2. The snare according to claim 1, characterized in that An annular groove (13) is provided on the end surface of the butt end of the fixed handle (1), and a clamping ring (33) is provided on the end surface of one end of the outer sheath tube (3) close to the butt end; the clamping ring (33) is inserted into the annular groove (13) and rotatably cooperates with the annular groove (13).

3. The snare according to claim 2, characterized in that: A threaded hole (10) is radially provided in the fixed handle (1), the threaded hole (10) and the annular groove (13) are communicated with each other, and a top screw is screwed into the threaded hole (10); an annular cavity (330) is provided on the outer peripheral wall of the clamping ring (33), and the annular cavity (330) is limitedly matched with the top screw.

4. The snare according to claim 1, characterized in that A rotating disk (31) is provided at one end of the rotating shaft (30) located outside the outer sheath tube (3).

5. The snare according to claim 1, characterized in that: A threading groove (71) is provided on the outer wall of the inner sheath tube (7) along the axial direction of the inner sheath tube (7) for the chain (9) to pass through.

6. The snare according to claim 1, characterized in that The inner sheath tube (7) comprises a sleeve ring (70), the sleeve ring (70) being arranged at an end of the inner sheath tube (7) away from the butt end, and the snake bone structure (8) being sleeved in the sleeve ring (70).

7. The snare according to claim 1, characterized in that The accommodating cavity (11) is arranged to radially penetrate the fixed handle (1), and a conductive core (120) is provided at one end of the guidewire control rod (12) away from the movable handle (2), and the conductive core (120) is electrically connected to the guidewire control rod (12).

8. The snare according to claim 1, characterized in that The insulating sleeve (6) is made of insulating material.

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