Snare

Abstract

The utility model relates to a snare. The snare comprises a sheathing canal assembly for limiting the axial far-end direction and the axial near-end direction; the sheath tube assembly comprises an inner sheath and an outer sheath arranged on the inner sheath in a sleeving mode. The water injection connecting piece is communicated with the sheath tube assembly; the loop is arranged in the inner sheath in a penetrating manner, and the loop is provided with a first near-end position and a first far-end position which are opposite to the inner sheath in the axial far-end direction and the axial far-end direction; the cutting part is fixed at the far end of the loop and is provided with an infusion hole; when the ring sleeve is located at the first near end position, the cutting part abuts against the sheath tube assembly in the axial far and near end direction; when the snare is in the first distal position, the snare protrudes out of the distal end of the sheath assembly. The snare can achieve multiple functions of safe insertion, safe extraction, marking, liquid injection, cutting and the like.

Description

Technical Field

[0001] This application relates to the field of endoscopic equipment technology, and in particular to snare devices. Background Technology

[0002] Endoscopic devices can enter narrow orifices or cavities and are increasingly widely used in the medical field.

[0003] To perform surgery, various instruments with different functions are often required. However, due to the small size of the cavity or incision, only one instrument can be inserted at a time. Limited by size, each instrument often performs a relatively simple function, requiring instruments to be inserted or removed one by one to perform different actions. For example, to remove a polyp or tumor, a snare is first inserted for marking. After marking, the snare is withdrawn from the endoscope, and then an injection needle is inserted to cause mucosal bulging. After injection, the needle is withdrawn, and then the snare is reinserted into the endoscope to dissect the tissue.

[0004] Alternating the use of instruments can affect surgical efficiency and prolong surgical time. Utility Model Content

[0005] Therefore, it is necessary to provide a snare device to address at least one of the aforementioned technical problems.

[0006] This application provides a snare device comprising: a sheath assembly defining an axial proximal-distal direction; the sheath assembly including an inner sheath and an outer sheath fitted over the inner sheath; a water inlet connector communicating with the sheath assembly; a snare inserted through the inner sheath, the snare having a first proximal position and a first distal position relative to the inner sheath along the axial proximal-distal direction; and a cutting portion fixed to the distal end of the snare, having an infusion port; when the snare is in the first proximal position, the cutting portion abuts against the sheath assembly along the axial proximal-distal direction; when the snare is in the first distal position, the snare protrudes beyond the distal end of the sheath assembly.

[0007] By setting an inner sheath and an outer sheath, the cutting part can be positioned in different ways. The snare of this application embodiment can realize multiple functions such as safe insertion, safe withdrawal, marking, fluid injection, and cutting. By setting a water injection connector, fluid can be injected through the infusion hole of the cutting part when the snare is in the corresponding position; in addition, when adjusting the infusion position, the cutting part can cooperate with the outer sheath without moving, which helps to efficiently and accurately determine the infusion position. The snare realizes multiple combined functions, and after a single insertion, it can efficiently and quickly perform various required actions.

[0008] This application provides a snare comprising: a sheath assembly defining an axial proximal-distal direction; the sheath assembly including an inner sheath and an outer sheath fitted onto the inner sheath, the outer sheath having a second proximal position and a second distal position relative to the inner sheath in the axial proximal-distal direction; a snare inserted into the inner sheath, the snare having a first proximal position and a first distal position relative to the inner sheath in the axial proximal-distal direction; a cutting portion fixed to the distal end of the snare; and a locking mechanism for locking the outer sheath at the second proximal position or the second distal position; wherein, when the snare is in the first proximal position and the outer sheath is in the second distal position, the outer sheath is fitted onto the cutting portion; when the snare is in the first distal position, the snare protrudes from the sheath assembly.

[0009] By setting a locking mechanism, the inner and outer sheaths can be locked in the desired positions, which helps to ensure that the snare performs the required operations in a predetermined posture. For example, locking the extended position of the outer sheath can ensure the safety of inserting and withdrawing the endoscope and avoid damage to the endoscopic lumen and gastrointestinal tract; while locking the retracted position of the outer sheath helps to ensure the stable realization of the core functions of the snare and prevent operational errors caused by instrument instability.

[0010] This application provides a method for controlling a snare. The snare includes: a sheath assembly defining an axial proximal-distal direction; the sheath assembly includes an inner sheath and an outer sheath fitted over the inner sheath; a water injection connector communicating with the sheath assembly; a snare passing through the inner sheath, the snare having a first proximal position and a first distal position relative to the inner sheath along the axial proximal-distal direction; and a cutting portion fixed to the distal end of the snare, having an infusion port. The method includes: controlling the snare in the first proximal position, the cutting portion abutting against the sheath assembly along the axial proximal-distal direction, so that the infusion port communicates with the sheath assembly, and infusing fluid into the infusion port through the water injection connector; adjusting the snare to the first distal position, so that the snare protrudes from the sheath assembly; and adjusting the snare from the first distal position to the first proximal position, thereby performing a cutting.

[0011] The method for controlling the snare according to the embodiments of this application can operate the snare to achieve multiple postures and can realize infusion and cutting functions.

[0012] This application provides a method for controlling a snare. The snare includes: a sheath assembly defining an axial proximal-distal direction; the sheath assembly includes an inner sheath and an outer sheath fitted onto the inner sheath, the outer sheath having a second proximal position and a second distal position relative to the inner sheath in the axial proximal-distal direction; a snare inserted into the inner sheath, the snare having a first proximal position and a first distal position relative to the inner sheath in the axial proximal-distal direction; a cutting portion fixed to the distal end of the snare; and a locking mechanism for locking the outer sheath at the second proximal position or the second distal position. The method includes: controlling the snare to be in the first proximal position and the outer sheath to be in the second distal position, such that the outer sheath is fitted onto the cutting portion; adjusting the snare to the first distal position, such that the snare protrudes from the sheath assembly; and adjusting the snare from the first distal position to the first proximal position, thereby performing a cutting.

[0013] The method for controlling the snare according to the embodiments of this application can operate the snare to achieve multiple postures and can maintain the posture of the outer sheath relative to the cutting part. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of a snare according to one or more embodiments;

[0015] Figure 2 A schematic structural diagram of a snare according to one or more embodiments;

[0016] Figure 3 A schematic diagram of a snare in a first state according to one or more embodiments;

[0017] Figure 4 A schematic diagram of a snare in a second state according to one or more embodiments;

[0018] Figure 5 This is a schematic diagram of the structure of a water injection assembly according to one or more embodiments;

[0019] Figure 6 A schematic diagram of a snare in a third state according to one or more embodiments;

[0020] Figure 7 This is a schematic diagram of the snare assembly and sheath assembly according to one or more embodiments;

[0021] Figure 8 This is a schematic diagram of the snare assembly and the limiting part according to one or more embodiments;

[0022] Figure 9 This is a schematic diagram of the structure of the limiting part according to one or more embodiments;

[0023] Figure 10A schematic flowchart of a method for controlling a snare according to one or more embodiments;

[0024] Figure 11 A schematic cutting process diagram of a snare according to one or more embodiments;

[0025] Figure 12 A schematic liquid injection process diagram of a snare according to one or more embodiments;

[0026] Figure 13 A schematic snare installation process diagram according to one or more embodiments;

[0027] Figure 14 A schematic isometric view of the distal end of a snare according to one or more embodiments;

[0028] Figure 15 This is a schematic diagram of the cutting portion according to one or more embodiments;

[0029] Figure 16 for Figure 15 A schematic sectional view at section AA;

[0030] Figure 17 This is a schematic diagram of the cutting portion according to one or more embodiments;

[0031] Figure 18 for Figure 17 A schematic sectional view at section BB;

[0032] Figure 19 This is a schematic diagram of the cutting portion according to one or more embodiments;

[0033] Figure 20 for Figure 19 A schematic sectional view at the CC section;

[0034] Figure 21 A schematic diagram of a snare in a fourth state according to one or more embodiments;

[0035] Figure 22 A schematic diagram of a snare in its fifth state according to one or more embodiments;

[0036] Figure 23 A schematic diagram of a snare in a sixth state according to one or more embodiments;

[0037] Figure 24 This is a schematic structural diagram of a sleeve and a water injection connector according to one or more embodiments;

[0038] Figure 25This is a schematic diagram of the structure of a first locking mechanism according to one or more embodiments;

[0039] Figure 26 This is a schematic diagram of the structure of a first locking mechanism according to one or more embodiments;

[0040] Figure 27 This is a schematic diagram of the structure of a second locking mechanism according to one or more embodiments;

[0041] Figure 28 This is a schematic diagram of the structure of a second locking mechanism according to one or more embodiments;

[0042] Figure 29 This is a schematic diagram of a third locking structure according to one or more embodiments;

[0043] Figure 30 This is an isometric schematic diagram of a fourth locking mechanism according to one or more embodiments;

[0044] Figure 31 This is a structural schematic diagram of a fourth locking mechanism according to one or more embodiments;

[0045] Figure 32 A schematic flowchart of a method for controlling a snare according to one or more embodiments;

[0046] Figure 33 This is a schematic diagram of the structure of a handle assembly according to one or more embodiments;

[0047] Figure 34 for Figure 33 A schematic enlarged view of point I in the middle;

[0048] Figure 35 This is a schematic diagram of the electrode and ring assembly process according to one or more embodiments;

[0049] Figure 36 This is a schematic diagram showing the electrode and ring according to one or more embodiments;

[0050] Figure 37 This is a schematic diagram of the structure of a handle assembly according to one or more embodiments;

[0051] Figure 38 for Figure 37 A schematic sectional view at section DD;

[0052] Figure 39 This is a schematic diagram showing the installation state of the electrodes and the ring according to one or more embodiments.

[0053] Explanation of reference numerals in the attached drawings: 1. Handle assembly; 101. Handle; 102. Finger ring; 1021. Limiting post; 1022. Support post; 1023. Anti-rotation part; 1024. Anti-expansion part; 1025. Electrode mounting groove; 103. Push-pull rod; 104. Electrode; 1041. Spring buckle; 1042. Limiting boss; 1043. Clamping groove; 1044. Step; 105. Fixing sleeve; 2. Water injection assembly; 20. Locking mechanism; 201. Water injection connector; 2010. Locked part; 2011. First toothed part; 202. Sleeve; 2020. Locking part; 203. Fixing part; 204. Sealing part; 205. Reset part; 206. Press 1. Button; 207. Operating part; 2071. Second toothed part; 208. Slide groove; 209. Elastic buckle; 2091. Buckle tooth; 2092. Protrusion controlled part; 3. Sheath assembly; 301. Heat shrink tubing; 302. Torque rope; 303. Outer sheath; 304. Sealing ring; 305. Inner sheath; 306. Limiting part; 4. Sleeve assembly; 401. Cutting part; 4011. Infusion port; 4012. Side fixing hole; 4013. Conical protrusion; 4014. Blade edge; 4015. Wedge structure; 4016. Side blade structure; 4017. Needle knife; 402. Sleeve; 4021. Electrode wire; 403. Connecting part; 1000. Sleeve device. Detailed Implementation

[0054] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0055] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0056] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0057] Furthermore, the terms "first," "second," and "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. For example, a first latching portion may also be referred to as a second latching portion, and a second latching portion may also be referred to as a first latching portion. A second proximal position may also be referred to as a first proximal position, and a first proximal position may also be referred to as a second proximal position. In the description of this application, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0058] In this application, unless otherwise expressly specified and limited, the terms "connected," "linked," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; a flexible connection or a rigid connection along at least one direction; a mechanical connection or an electrical connection; a direct connection or an indirect connection through an intermediate medium, or a direct connection with an intermediate medium present; and they can also refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. The terms "installed," "set," "fixed," etc., can be broadly understood as connection. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0059] It should be noted that, in this application, the terms "distal" and "proximal" are used with the operator as the reference point. The end closer to the operator is the proximal end or proximal portion, and the end farther from the operator is the distal end or distal portion. The side facing the operator is the proximal side or proximal side, and the side away from the operator is the distal side or distal side. Furthermore, "distal direction" and "proximal direction" represent two directions; the proximal-distal direction is parallel to both the distal and proximal directions, and does not specifically refer to forward or reverse directions. The axial proximal-distal direction is along the axial direction of the main component, the sheath assembly. The axial direction of the branch components may intersect the axial direction of the sheath assembly.

[0060] refer to Figure 1 , Figure 1 A snare device according to an embodiment of this application is shown. (In conjunction with...) Figure 2 As shown, in an exemplary embodiment, the snare 1000 may include a handle assembly 1. The handle assembly 1 can be held and operated by hand, and the snare 1000 may be a manually operated device. The snare 1000 may also be an automated device.

[0061] The snare 1000 may include a water injection assembly 2. The water injection assembly 2 may be connected to an external water pump. The water injection assembly 2 may be connected to the distal end of the handle assembly 1.

[0062] The snare 1000 may include a sheath assembly 3. The sheath assembly 3 defines an axial proximal-distal direction, which may be parallel to the X-axis direction shown in the figure. The sheath assembly 3 includes an inner sheath 305 and an outer sheath 303 sleeved on the inner sheath 305. The outer sheath 303 is slidably connected to the inner sheath 305 and may have multiple relative positions. (Reference) Figure 3 and Figure 4 The outer sheath 303 has a second distal position and a second proximal position relative to the inner sheath 305 in the axial proximal-distal direction.

[0063] The snare 1000 may include a snare assembly 4. The snare assembly 4 may be a monopolar snare assembly capable of tissue cutting by electrical current. The snare assembly 4 is disposed on the sheath assembly 3 and can be extended from or retracted from the sheath assembly 3 under the control of the handle assembly 1.

[0064] refer to Figures 1 to 5 In some embodiments, the snare 1000 includes a water injection connector 201, which can be used to form a water injection assembly 2. In the water injection assembly 2, the water injection connector 201 is connected to the sheath assembly 3.

[0065] The snare 1000 also includes a snare 402 and a cutting portion 401. The snare 402 and the cutting portion 401 can be used to form a snare assembly 4. The snare 402 passes through an outer sheath 303; exemplarily, the snare 402 passes through an inner sheath 305. (See reference) Figure 4 and Figure 6 The snare 402 has a first proximal position and a first distal position relative to the inner sheath 305 along the axial proximal-distal direction. Figure 1 As shown, the cutting part 401 is fixed to the distal end of the loop 402. The cutting part 401 may have an infusion hole 4011.

[0066] The positions of the snare 402 and the outer sheath 303 relative to the inner sheath 305 are adjustable, allowing the snare 1000 to assume various postures. The relative positions of the snare 402 and the outer sheath 303 can be set by adjusting the length and positioning of each component.

[0067] refer to Figure 4 and Figure 1For example, when the snare 402 is in the first proximal position and the outer sheath 303 is in the second proximal position, the cutting portion 401 protrudes from the outer sheath 303 and also from the sheath assembly 3. By designing the first proximal position of the snare 402, the snare 402 can protrude a shorter section, with most of it remaining inside the outer sheath 303.

[0068] refer to Figure 3 When the snare 402 is in the first proximal position and the outer sheath 303 is in the second distal position, the outer sheath 303 engages with the cutting part 401, so that the infusion port 4011 is connected to the water injection connector 201. The second distal position of the outer sheath 303 is designed, or the outer sheath 303 is set to engage with... Figure 3 The position of the cut portion 401 at the location is the second distal position. In other embodiments, the outer sheath 303 may also be moved further away.

[0069] refer to Figure 6 When the snare 402 is in the first distal position, the snare 402 can protrude from the outer sheath 303. The outer sheath 303 can be in a second proximal position or a second distal position. In other cases, the outer sheath 303 can be in other different positions.

[0070] refer to Figure 7 , Figure 8 and Figure 1 In some embodiments, the snare 1000 further includes a connecting portion 403, which can be used to form the snare assembly 4. The connecting portion 403 is fixed to the proximal end of the snare 402. The snare 402 may include two electrode wires 4021 to form a ring structure, and the connecting portion 403 ensures that the snare 402 structure is robust.

[0071] The snare 1000 also includes a limiting portion 306. The limiting portion 306 can be used to form the sheath assembly 3, and is fixed to the inner sheath 305. The limiting portion 306 can abut against the connecting portion 403 in the axial proximal-distal direction, so that the snare 402 is in a first proximal position relative to the inner sheath 305. The limiting portion 306 can be fitted into a predetermined position within the inner sheath 305, protruding from the inner wall of the inner sheath 305; it can also be an integral structure. The limiting portion 306 ensures that the snare 402 is in the first proximal position.

[0072] The snare 1000 also includes a torque cord 302, which may be disposed within an inner sheath 305. The torque cord may be part of the sheath assembly 3, transmitting the control force from the handle assembly 1 to the snare assembly 4; in other cases, the torque cord 302 may be considered as constituting the handle assembly 1. The distal end of the torque cord 302 is fixed to a connecting portion 403. The torque cord 302 may be a metal cord, which may be directly electrically connected to the snare 402, or indirectly electrically connected to the snare 402 via the metal connecting portion 403. The torque cord 302 is used to control the movement of the snare 402 between a first proximal position and a first distal position.

[0073] refer to Figure 9 The limiting portion 306 may have an opening. When the water injection connector 201 is connected to the inner sheath 305, liquid flows through the limiting portion 306. The outer diameter of the torque rope 302 may be smaller than the inner diameter of the limiting portion 306, and the outer diameter of the connecting portion 403 may be smaller than the inner diameter of the inner sheath 305. Figure 7 and Figure 1 When the snare 402 is in the first proximal position, the connecting part 403 abuts against the limiting part 306, and the infusion hole 4011 can be connected to the water injection connector 201 through the opening.

[0074] refer to Figure 1 , Figure 3 , Figure 4 and Figure 6 The snare 1000 may also include a sealing ring 304. The sealing ring 304 is disposed on the outer sheath 303 and can be used to form the sheath assembly 3. (Reference) Figure 3 A sealing ring 304 is used to seal the contact cutting part 401. The distal end of the sealing ring 304 may be a groove, and the cutting part 401 is at least partially embedded in the groove to achieve a sealed contact. The infusion port 4011 can be connected to the outer sheath 303 through the inner hole of the sealing ring 304, and then connected to the water injection connector 201. When the outer sheath 303 is used for infusion, it ensures that the liquid is output primarily from the infusion port 4011, preventing leakage from other locations. (Reference) Figure 6 The snare 402 can extend from the sealing ring 304 to the distal end. By configuring the positions of the outer sheath 303 and the limiting part 306, it can be ensured that the cutting part 401 extends a fixed distance from the outer sheath 303, and the snare 402 can effectively support the cutting part 401.

[0075] The snare 1000 of this application embodiment can perform multiple functions such as safe insertion, safe withdrawal, marking, injection, and cutting. The snare 1000 can be inspected, operated, and used in surgery.

[0076] refer to Figure 10This application provides a method S2000 for controlling a snare. The method S2000 for controlling a snare can use the aforementioned snare 1000. The method S2000 for controlling a snare may include at least one step from steps S220 to S250.

[0077] For example, the method S2000 for controlling the snare may include step S210, controlling the snare 402 to be in a first proximal position and the outer sheath 303 to be in a second distal position. The cutting portion 401 is completely enclosed by the outer sheath 303, thereby avoiding the risk of cutting due to exposure of the cutting portion 401, and enabling safe movement of the snare 1000. For example, in surgery, this can prevent scratching of cavity tissues.

[0078] Step S220: Control the snare 402 to be in the first proximal position and the outer sheath 303 to be in the second proximal position. (Reference) Figure 11 In step S220, the cutting part 401 protrudes from the outer sheath 303. The snare 1000 in this position can be cut using the cutting part 401, and can also be flushed with intravenous fluids. During surgery, the cutting part 401 can be used to make incisions at predetermined locations on the tissue mucosa.

[0079] Step S230: Control the snare 402 to be in the first proximal position. (As...) Figure 3 In the illustrated embodiment, the outer sheath 303 may be located at the second distal end position, and the outer sheath 303 of the sheath assembly 3 engages with the cutting portion 401. (See reference) Figure 12 The cut section 401, after cutting, does not need to be pulled out or subjected to large-scale movements; it can remain at the incision site while the outer sheath 303 is adjusted. When adjusting the infusion posture, the cut section 401 can engage with the outer sheath 303 without movement, facilitating efficient and accurate determination of the infusion position. The sealing ring 304 of the outer sheath 303 prevents liquid leakage, ensuring that the infusion port 4011 is connected to the water injection connector 201.

[0080] Step S230 may further include: administering fluid to the infusion port 4011 through the water infusion connector 201. During surgery, the fluid output through the infusion port 4011, such as saline, can be injected into the tissue mucosa, causing local tissue bulging.

[0081] For example, step S210 can be performed multiple times before or after different steps, such as when the snare 1000 needs to be moved.

[0082] Step S240: Adjust the snare 402 to the first distal position, so that the snare 402 protrudes beyond the distal end of the sheath assembly 3. For example... Figure 6 In the illustrated embodiment, when the outer sheath 303 extends further than the inner sheath 305, the snare 402 can still remain completely outside the outer sheath 303. (See reference) Figure 13The snare 402 can be placed on the tissue to be removed. The snare 402 can extend completely or partially.

[0083] In step S250, the snare 402 is adjusted from the first distal position to the first proximal position. The snare 402 can be energized for cutting. Energizing the snare 402 while tightening it ensures contact between the snare 402 and the tissue, facilitating cutting. Exemplarily, energizing may not be applied at the beginning of tightening and during the final stage.

[0084] The S2000 method for controlling the snare is easy to execute, allows for small movements, and offers short operation time and high efficiency. Utilizing the snare 1000, a complex set of functions can be implemented, enabling efficient and rapid execution of various required actions after a single insertion.

[0085] refer to Figure 14 The cutting part 401 has two side fixing holes 4012, which can be located on both sides of the infusion port 4011. The electrode wire 4021 can be fixed in the corresponding side fixing hole 4012, for example, by welding.

[0086] refer to Figure 15 and Figure 16 For example, the distal end of the cutting portion 401 includes a tapered protrusion 4013. The tapered protrusion 4013 may be centrally located. The tapered protrusion 4013 facilitates cutting the mucosa.

[0087] refer to Figure 17 and Figure 18 For example, the distal end of the cutting portion 401 includes a wedge-shaped structure 4015, which may be approximately equal in width in the Y-axis direction and have two bevels in the Z-axis direction. The wedge-shaped structure 4015 facilitates cutting the mucosa. The distal end of the cutting portion 401 may also be configured as other shapes such as a pyramid.

[0088] The proximal end of the cutting section 401 may include a cutting edge 4014. The cutting edge 4014 is located between the two electrode wires 4021 of the loop 402, and its cutting edge extends along the parallel direction of the two electrode wires 4021. The cutting edge can be substantially close to the side fixing hole 4012. Towards the end of the cutting process of the loop 402, when the distance between the two electrode wires 4021 is difficult to reduce further, the cutting edge 4014 allows for clean removal of tissue.

[0089] refer to Figure 16 and Figure 18 The two inlets of the infusion port 4011 are located on both sides of the cutting edge, enabling efficient fluid intake within a compact space. The outlet of the infusion port 4011 is located at the conical protrusion 4013, or correspondingly at the wedge-shaped structure 4015. The outlet of the infusion port 4011 may be located at the center of the cutting section 401.

[0090] refer to Figure 19 The proximal end of the cutting section 401 may include a side cutting edge structure 4016, the cutting edge of the side cutting edge structure 4016 may be inclined relative to the X-axis direction, and the two cutting edges may form an angle, which helps to cleanly remove tissue.

[0091] The outer periphery of the cutting section 401 can be circular. (Reference) Figure 19 and Figure 20 The outer periphery of the cutting section 401 can be star-shaped, which is beneficial for cutting, such as cutting the mucosa.

[0092] refer to Figure 1 , Figure 14 , Figure 16 and Figure 18 An infusion port 4011 communicates with the inner sheath 305. The ratio of the cross-sectional area of ​​the infusion port 4011 to the effective distal cross-sectional area of ​​the inner sheath 305 ranges from 1:8 to 1:30, for example, 1:10, 1:15, or 1:20. Compared to the inner sheath 305, the smaller infusion port 4011 can increase the outflow pressure, facilitating fluid injection into the tissue. The effective distal cross-sectional area of ​​the inner sheath 305 can be calculated by subtracting the area occupied by components penetrating at the distal end of the inner sheath 305 from the distal cross-sectional area of ​​the inner sheath 305. The infusion port 4011 extends from the proximal end of the cutting section 401 to the distal end of the cutting section 401. The cross-sectional area of ​​the infusion port 4011 can refer to the cross-sectional area of ​​the outlet of the infusion port 4011.

[0093] For example, the cross-sectional area of ​​the outlet of the infusion port 4011 is 0.05 mm. 2 The distal cross-sectional area of ​​the inner sheath 305 is 1.13 mm². 2 The cross-sectional area of ​​the torque rope 302 can be 0.37mm². 2 Subsequently, the effective cross-sectional area of ​​the distal end of the inner sheath 305 is 0.76 mm. 2 The ratio of the cross-sectional area of ​​the infusion port 4011 to the effective cross-sectional area of ​​the distal end of the inner sheath 305 is 1:15.2. The radial dimension of the sheath assembly 3 is small, the water injection force is good, and the cutting part 401 is easy to process.

[0094] In other embodiments, the water injection assembly 2 is connected to the outer sheath 303, and the cutting section 401 can be connected to the water injection assembly 2 through the outer sheath 303. The outlet of the infusion port 4011 can be located at other positions of the cutting section 401.

[0095] refer to Figure 1 , Figure 21 , Figure 22 and Figure 23 In an exemplary embodiment, the snare 1000 may include a sheath assembly 3, a water injection connector 201, a snare 402, and a cutting section 401.

[0096] The water inlet connector 201 is connected to the sheath assembly 3. The loop 402 passes through the inner sheath 305 of the sheath assembly 3, and the cutting part 401 is fixed to the distal end of the loop 402. When the loop 402 is in the first proximal position relative to the inner sheath 305, the cutting part 401 abuts against the sheath assembly 3. The infusion port 4011 of the cutting part 401 is connected to the sheath assembly 3.

[0097] refer to Figure 21 and Figure 22 The cutting portion 401 abuts against the inner sheath 305, for example, the proximal end of the cutting portion 401 abuts against the distal end of the inner sheath 305. The abutment surface can be sealed; it can be a plane or a conical surface. Exemplarily, the proximal radius of the cutting portion 401 is larger than the distal radius of the inner sheath 305. When the loop 402 is in the first proximal position, the proximal end of the cutting portion 401 can abut against the distal end of the inner sheath 305, allowing the infusion port 4011 to communicate with the inner sheath 305. The sheath assembly 3 has a simple and compact structure and can be manufactured to be thinner or have a coarser orifice.

[0098] refer to Figure 23 When the snare 402 is in the first distal position relative to the inner sheath 305, the snare 402 can protrude from the distal end of the sheath assembly 3. After the sheath assembly 3 of the snare 1000 of this application is inserted, it can perform operations such as cutting and water injection. The snare 1000 has a compact structure and the radial space can be designed and utilized more freely.

[0099] refer to Figure 21 and Figure 22 The cutting section 401 includes a needle blade 4017. The needle blade 4017 extends a predetermined distance away from the contact surface along the axial proximal-posterior direction, for example, longer than the thickness of the mucosa to be cut. The distal blade of the needle blade 4017 may be wider than the blade body, facilitating tissue insertion after the incision is made. An infusion port 4011 penetrates the needle blade 4017, enabling fluid injection into the incision. (Reference) Figure 22 When the outer sheath 303 is in the second proximal position, the cutting portion 401 may protrude from both the outer sheath 303 and the inner sheath 305. (Reference) Figure 21 When the outer sheath 303 is in the second distal position, the cutting part 401 can be completely retracted into the outer sheath 303. The outer sheath 303 can both protect the cutting part 401 and prevent the cutting part 401 from scratching foreign objects.

[0100] refer to Figure 2 and Figure 5 The water injection connector 201 is connected to the inner sheath 305. The outer interface of the water injection connector 201 can be set at an angle, and the torque rope 302 can be threaded through the water injection connector 201 along the axial direction of the proximal and distal ends.

[0101] The snare 1000 also includes a seal 204. The seal 204 is disposed in a sealing fit at the proximal end of the inner sheath 305. The seal 204 may be a sealing ring fitted onto the torque rope 302. The seal 204 may be disposed on the water injection connector 201. Exemplarily, the snare 1000 also includes a retainer 203, which may be interference-fitted with the seal 204 to the water injection connector 201, and the retainer 203 may be interlocked with the water injection connector 201 to abut against the seal 204.

[0102] The snare 1000 also includes a sleeve 202. The sleeve 202 is fixed to the outer sheath 303 and is easily gripped by hand, used to adjust the relative position of the outer sheath 303 and the inner sheath 305 along the axial proximal-distal direction. The sleeve 202 is slidably connected to the water injection connector 201 to prevent radial sway. The sheath assembly 3 may also include a heat shrink tubing 301, which is fixed to the outer sheath 303 and to the sleeve 202. The heat shrink tubing 301 helps to strengthen the connection.

[0103] refer to Figures 24 to 26 The snare 1000 also includes a locking mechanism 20. The locking mechanism 20 may include a locking part 2020 and a locked part 2010, which can cooperate with each other. Optionally, the locking part 2020 is disposed on the outer sheath 303, and the locked part 2010 is fixed to the inner sheath 305. The locking mechanism 20 is used to lock the outer sheath 303 in a second proximal position or a second distal position.

[0104] For example, the locking part 2020 is disposed on the sleeve 202; the locked part 2010 is disposed on the water injection connector 201. The cooperation between the sleeve 202 and the water injection connector 201 helps to ensure a reliable engagement between the locking part 2020 and the locked part 2010. Optionally, the locking part 2020 is disposed on the water injection connector 201, and the locked part 2010 is disposed on the sleeve 202.

[0105] The locking part 2020 may include at least two sets of slots spaced apart along the axial proximal-rear direction, each set of slots including at least one slot. The locked part 2010 may include at least one latch. The latch can be selectively engaged with different sets of slots. The locking part 2020 may have a symmetrical structure to facilitate installation, and the latch can be engaged with the corresponding slot. The sleeve 202 may be fitted onto the locked part 2010, and the slot may be a radial through hole, exposing the latch radially outward. Figure 25 As shown, the locking part 2020 is locked to a more distal position relative to the locked part 2010, at which time the outer sheath 303 can be locked to the second distal position. Figure 26 As shown, the buckle engages in a set of slots biased towards the proximal side, and the locking part 2020 is locked in the biased proximal position. At this time, the outer sheath 303 can be locked in the second proximal position.

[0106] refer to Figure 27 and Figure 28 This application provides a locking mechanism. The locking mechanism 20 is used to control the sheath assembly 3 to cooperate with the cutting part 401 and the snare 402.

[0107] In an exemplary embodiment, the snare 1000 includes a sheath assembly 3, a snare 402, a cutting portion 401, and a locking mechanism 20. The snare 402 passes through the inner sheath 305 of the sheath assembly 3. The locking mechanism 20 can lock the outer sheath 303 in at least one position relative to the inner sheath 305. When the snare 402 is in a first proximal position and the outer sheath 303 is in a second distal position, the outer sheath 303 is fitted onto the cutting portion 401. When the snare 402 is in the first distal position, the snare 402 protrudes from the sheath assembly 3. The snare 1000 of this embodiment is easy to adjust and convenient to operate after adjustment.

[0108] For example, when the snare 402 is in the first proximal position and the outer sheath 303 is in the second proximal position, the cutting part 401 protrudes from the outer sheath 303, and the cutting part 401 may be without the infusion hole 4011.

[0109] refer to Figure 27 and Figure 28 The locking mechanism 20 of this application embodiment includes a locking part 2020 and a locked part 2010. The locked part 2010 includes a first toothed part 2011. Specifically, the first toothed part 2011 can be integrally formed with the water injection connector 201 and indirectly fixed to the inner sheath 305. The locking part 2020 may include a reset part 205, an operating part 207, and a second toothed part 2071. The locking part 2020 can be disposed on the sleeve 202 to indirectly dispose of the outer sheath 303.

[0110] Optionally, the locking part 2020 is disposed on the outer sheath 303, the first toothed part 2011 is fixed to the inner sheath 305, and the outer sheath 303 can be sleeved on the first toothed part 2011. The first toothed part 2011 can face inward and radially towards the torque rope 302; or it can be offset from the torque rope 302 in the YZ plane. The outer peripheral surface of the water injection connector 201 can be basically smooth to avoid wear of the first toothed part 2011 or its influence by foreign objects.

[0111] The second toothed portion 2071 may extend into the outer sheath 303 to engage the first toothed portion 2011. At least one of the second toothed portion 2071 and the first toothed portion 2011 may include a plurality of teeth, for example, the first toothed portion 2011 may be a rack. In some embodiments, the first toothed portion 2011 is provided with teeth only at the locking positions at both ends, with the middle position left empty.

[0112] The operating part 207 controls the second toothed portion 2071 to disengage from the first toothed portion 2011, allowing the outer sheath 303 to slide relative to the inner sheath 305 in the axial proximal-distal direction. The operating part 207 may extend to the outside of the outer sheath 303 or the sleeve 202. The reset part 205 may be a spring, such as a compression spring. One end of the reset part 205 is supported on the sleeve 202 or the outer sheath 303, and the other end may be welded to the operating part 207, for example. Figure 27 and Figure 28 As shown, the reset part 205 moves upward via the drive operation part 207, which drives the second toothed part 2071 to engage with the first toothed part 2011, thereby locking the outer sheath 303 in the axial proximal-distal direction to the inner sheath 305. The internal structure of the sleeve 202 is simple and compact. After the operator presses the operation part 207, the outer sheath 303 can be slid to adjust the relative position of the outer sheath 303 with respect to the snare 402, so as to realize the function of the snare device 1000.

[0113] The locking mechanism 20 may also include a button 206, which may be a rubber part covering the operating part 207 and the reset part 205. In some embodiments, the button 206 is fixed to the operating part 207 to form a T-shaped structure, and the reset part 205 can abut against the button 206 to indirectly drive the operating part 207 and the second toothed part 2071.

[0114] refer to Figure 28 The second toothed portion 2071 is wider than the operating portion 207, and both sides protrude from the operating portion 207. The locking mechanism 20 is subjected to balanced forces and can be ingeniously combined to achieve its function.

[0115] refer to Figure 29 In some embodiments, in the locking mechanism 20, the locked part 2010 may include a first toothed part 2011, and the locking part 2020 includes an operating part 207, a sliding groove 208, and an elastic buckle 209.

[0116] The first toothed portion 2011 can be integrally formed with the water injection connector 201, and the first toothed portion 2011 can face outwards, radially away from the torque rope 302. The groove 208 includes a first position and a second position, and the groove 208 can extend along the axial proximal-distal direction. The groove 208 can also be a circumferential annular groove. The operating part 207 can slide between the first position and the second position. The body of the elastic buckle 209 is elastic and can drive the buckle teeth 2091 to disengage from the first toothed portion 2011. The elastic buckle 209 may include a protruding controlled portion 2092 protruding into the groove 208, which can be squeezed by the operating part 207; in another embodiment, the operating part 207 may include a protruding control portion protruding into the groove 208 from the inner side of the outer sheath 303 to squeeze the elastic buckle 209.

[0117] When the operating unit 207 is in Figure 29In the first position shown, the operating part 207 can release the elastic buckle 209, allowing the outer sheath 303 to slide relative to the inner sheath 305 along the axial proximal-distal direction. When the operating part 207 is in the second position, it drives the elastic buckle 209 to engage with the first toothed portion 2011, locking the outer sheath 303 to the inner sheath 305 along the axial proximal-distal direction. It can be locked in different positions as needed.

[0118] With the operating part 207 disengaged from the elastic buckle 209 in a relaxed state, the elastic buckle 209 can be in a free state, eliminating the need for constant finger pressure and making the snare 1000 easy to operate. The elastic buckle 209 is axially positioned, and the locking mechanism 20 has a compact radial structure, allowing for a thinner design that is easier to grip. The body of the elastic buckle 209 can be considered a reset part, and the buckle teeth 2091 can be referred to as the second toothed part.

[0119] refer to Figure 30 and Figure 31 In the locking mechanism 20, the reset part 205 can be an elastic cantilever fixed to the sleeve 202 or the outer sheath 303. The distal end of the elastic cantilever is the root, and the proximal end is the end part. The second toothed part 2071 is provided at the end part of the elastic cantilever. The operating part 207 can be provided approximately in the middle of the elastic cantilever, or it can be provided at the end part. Specifically, it can be provided protrudingly on the outside for pressing, and is used to control the second toothed part 2071 to disengage from the first toothed part 2011. The first toothed part 2011 can be divided into two racks. The second toothed part 2071 is wider than the reset part 205. The locking mechanism 20 is shorter in length along the axial direction from the proximal end to the distal end. The elastic cantilever can ensure that the second toothed part 2071 engages with the first toothed part 2011.

[0120] In other embodiments, the first toothed portion 2011 is coaxially arranged with the reset portion 205, the second toothed portion 2071 extends out to a longer position, and the elastic cantilever can be designed to be wider.

[0121] When the operating part 207 is pressed, the end of the elastic cantilever can drive the second toothed part 2071 to move downward, disengaging from the first toothed part 2011. Subsequently, the outer sheath 303 can slide relative to the inner sheath 305 in the axial proximal-distal direction. After the operating part 207 is released, the second toothed part 2071 is driven by the reset part 205 to engage with the first toothed part 2011, thereby locking the outer sheath 303 in the axial proximal-distal direction to the inner sheath 305.

[0122] refer to Figure 30 and Figure 31 The sleeve 202 and the water injection connector 201 are connected along the axial direction from the proximal end to the distal end. The two can be locked together to prevent separation. Multiple slide rails can be provided between the two, with the buckle acting as a slider.

[0123] The locking mechanism between the sleeve 202 and the water injection connector 201 is simple and requires few parts. The sleeve 202 can be a one-piece structure, which can be directly inserted into the one-piece water injection connector 201 during installation, making it easy to assemble and manufacture; the structure is simple and reliable.

[0124] like Figures 27 to 31 The first toothed portion 2011 is a rack, and the second toothed portion 2071 meshes with the first toothed portion 2011, thereby achieving precise control of the position of the outer sheath 303 relative to the inner sheath 305. There is often a large gap between the torque rope 302 and the inner sheath 305, resulting in idle travel during the pulling of the snare 402 by the torque rope 302. The gap may also differ in different specifications and models of the snare 1000. Therefore, by designing the locking mechanism 20 to include a rack, this solution can achieve near-stepless locking control, and the arbitrarily specified locking position can absorb the idle travel, thus adapting to different specifications and models of the snare 1000.

[0125] refer to Figure 32 This application provides a method S3000 for controlling a snare, wherein the snare 1000 used in this method may include the aforementioned locking mechanism 20. The snare 1000 may include: a sheath assembly 3 defining an axial proximal-distal direction; the sheath assembly 3 includes an inner sheath 305 and an outer sheath 303 sleeved on the inner sheath 305, the outer sheath 303 having a second proximal position and a second distal position relative to the inner sheath 305 along the axial proximal-distal direction; a snare 402 passing through the inner sheath 305, the snare 402 having a first proximal position and a first distal position relative to the inner sheath 305 along the axial proximal-distal direction; a cutting portion 401 fixed to the distal end of the snare 402; and a locking mechanism 20 for locking the outer sheath 303 at the second proximal position or the second distal position.

[0126] The method S3000 for controlling the snare may include at least one of steps S310 to S340.

[0127] In step S310, the control loop 402 is positioned at the first proximal end and the outer sheath 303 is positioned at the second distal end, with the outer sheath 303 fitted onto the cutting section 401. Specifically, the outer sheath 303 can be locked using the locking mechanism 20.

[0128] Step S320: Control the outer sheath 303 to the second proximal position. Exemplarily, the snare 402 can be held in the first proximal position, such that the cutting portion 401 protrudes from the sheath assembly 3, for example, from the outer sheath 303. (See reference...) Figure 4 and Figure 22 The positions of the outer sheath 303 and the inner sheath 305 can be determined according to the design dimensions; they can be flush or one can protrude further towards the distal end.

[0129] In order to switch the position of the outer sheath 303, the outer sheath 303 can be unlocked by locking mechanism 20 first; then, depending on the position of the outer sheath 303, the outer sheath 303 can be locked again by locking mechanism 20.

[0130] In step S330, the snare 402 is adjusted to the first distal position, so that the snare 402 protrudes from the sheath assembly 3. At least a portion of the snare 402 can be used for application. The position of the outer sheath 303 can be maintained or adjusted so that the sheath assembly 3 can be used in conjunction with the snare 402.

[0131] In step S340, the snare 402 is adjusted from the first distal position to the first proximal position. The snare 402 can be energized. The snare 402 can perform electrical cutting, and can be substantially or completely retracted into the sheath assembly 3. The final stage can be completed using the cutting edge 4014 of the cutting section 401.

[0132] For example, the snare 402 can be used with an external electrode plate, or it can be made into a bipolar snare.

[0133] The method S3000 for controlling the snare can lock the outer sheath 303 using the locking mechanism 20, which is easy to operate and keeps the snare 1000 in good position.

[0134] refer to Figure 33 and Figure 2 In an exemplary embodiment, the snare 1000 includes a ring 102, an electrode 104, and a push-pull rod 103. The ring 102, electrode 104, and push-pull rod 103 can be used to form a handle assembly 1. The handle assembly 1 may also include a handle 101 disposed on the water injection connector 201 to be fixed to the inner sheath 305. The handle assembly 1 can be used to control the aforementioned snare assembly 4.

[0135] The ring 102 is slidably mounted on the handle 101, which enables the ring 102 to be slidably connected to the sheath assembly 3 along the axial proximal-rear direction.

[0136] refer to Figure 34 , Figure 35 and Figure 36 The ring 102 includes an electrode mounting groove 1025. The ring 102 may include a ring body and a mounting portion, and the electrode mounting groove 1025 may be formed in the mounting portion, for example, extending along the Y-axis direction. An electrode 104 passes through and is mounted in the electrode mounting groove 1025. The electrode 104 is used for external power supply. The electrode 104 is fixed to a push-pull rod 103. After installation, the push-pull rod 103 is positioned along the X-axis direction.

[0137] The push-pull rod 103 can be a hollow rod used to sleeve and connect the torque rope 302. The torque rope 302 can be directly electrically connected to the electrode 104, or it can be electrically connected to the electrode 104 through the metal push-pull rod 103.

[0138] Electrode 104 includes an electrode post, a first latching portion, and a second latching portion. For example... Figure 34 As shown, exemplarily, the first latching portion may be a limiting boss 1042, and the second latching portion may be a step 1044 based on the electrode post. In other embodiments, the second latching portion may be another set of limiting bosses.

[0139] The first and second locking portions are spaced apart along the electrode post and protrude from the sidewall of the electrode post to clamp the two ends of the electrode mounting groove 1025, locking the electrode 104 to the ring 102. The ring 102 moves along the X-axis, and the mounting direction of the electrode 104 intersects the X-axis, for example, perpendicularly, to ensure that the electrode 104 is securely mounted.

[0140] refer to Figure 34 The push-pull rod 103 can be threaded along the X-axis through the upper end of the electrode 104 as shown in the figure. The push-pull rod 103 can be fixed to the electrode 104 on both sides of its connection point with the electrode 104 by a flattening process, which also ensures a secure connection between the push-pull rod 103 and the torque rope 302. When assembling the handle assembly 1 and the snare 1000, the push-pull rod 103 and the electrode 104 can be installed first, and the ring 102 can be left uninstalled on the handle 101 initially.

[0141] refer to Figure 35 and Figure 36 The electrode mounting groove 1025 is an elliptical groove. Figure 35 The major axis of the elliptical groove's cross-section is along the Z-axis, and the minor axis is along the X-axis. (Reference) Figure 35 The first engaging portion can be inserted into the elliptical groove in a manner aligned with the major axis of the elliptical groove's cross-section. The two limiting protrusions 1042 are positioned opposite each other, preventing interference between the electrode 104 and the elliptical groove at other circumferential positions. (Reference) Figure 36 When the first locking part deflects around the elliptical groove, for example, by 90°, the first and second locking parts respectively clamp the two ends of the elliptical groove, locking the electrode 104 to the ring 102. The dimensions of the two limiting bosses 1042 are longer than the minor axis of the elliptical groove, and the step 1044 is at least... Figure 34 The outer diameter shown is larger than the size of the short axis. For a stable connection, the diameter of the electrode post can be approximately equal to the size of the short axis, so that the position of electrode 104 is substantially defined.

[0142] In other embodiments, the electrode mounting groove 1025 is, for example, teardrop-shaped, rhomboid, or other non-circular shapes.

[0143] In other embodiments, the long axis of the cross section can be along other directions within the XZ plane. Correspondingly, the push-pull rod 103 and the limiting boss 1042 are deflected circumferentially. When the limiting boss 1042 is locked substantially along the short axis of the cross section, the push-pull rod 103 rotates to the axial proximal and distal end directions.

[0144] refer to Figure 37 The snare 1000 may further include a fixing sleeve 105. The fixing sleeve 105 is fixed to the proximal end of the push-pull rod 103 and can be fixed by crimping or welding. The fixing sleeve 105 has a larger outer diameter, which can lock onto the electrode 104 and prevent the push-pull rod 103 from being pulled out of the electrode 104 in the distal direction. The ring 102 may include a limiting post 1021, which is spaced apart from the electrode 104 on both sides of the fixing sleeve 105. When the ring 102 is pushed or pulled in the distal direction, the limiting post 1021 contacts the fixing sleeve 105 and drives the fixing sleeve 105 and the push-pull rod 103 to move in the distal direction.

[0145] The ring 102 may also include a support post 1022. The support post 1022 is located on the distal side of the electrode 104 and can support the electrode 104. When the ring 102 moves in the proximal direction, the push-pull rod 103 can apply a force in the distal direction to the electrode 104 by, for example, friction and by, for example, the fixing sleeve 105, while the support post 1022 can apply a force in the proximal direction to the electrode 104. The forces on both sides of the electrode 104 are balanced, which helps to prevent the electrode 104 from bending.

[0146] The handle assembly 1 with the fixed sleeve 105 is easy to assemble, which is conducive to realizing automated assembly and improving production efficiency.

[0147] refer to Figure 37 , Figure 38 and Figure 39 For example, the first locking part is a spring-loaded buckle 1041, such as two spring-loaded buckles 1041 arranged opposite each other. The spring-loaded buckle 1041 can pass through one end of the electrode mounting groove 1025 and exit from the other end of the electrode mounting groove 1025 and spring open. The second locking part can also be a limiting boss 1042. The limiting boss 1042 and the spring-loaded buckle 1041 respectively clamp the two ends of the electrode mounting groove 1025, locking the electrode 104 to the ring 102.

[0148] The ring 102 may also include an anti-expansion portion 1024. The anti-expansion portion 1024 is radially spaced within the electrode mounting groove 1025 to limit the spring clip 1041. During use, when the cable is inserted into the ring 102 of the handle assembly 1, the electrode 104, when connected to the cable, is subjected to pressure along the Y-axis, causing the spring clip 1041 to deform outwards. This can lead to the spring clip 1041 losing its limiting effect, causing the electrode 104 and push-pull rod 103 to move, resulting in a deviation in the position of the distal loop assembly 4. The anti-expansion portion 1024 prevents the spring clip 1041 from expanding outwards, ensuring the mechanism's sensitivity and accuracy.

[0149] Electrode 104 may include a clamping groove 1043, and push-pull rod 103 can be inserted into the electrode through the clamping groove 1043.

[0150] refer to Figure 39 The ring 102 may also include an anti-rotation portion 1023, which may be a protrusion and has a slot for engaging the snap 1041. For example, based on the XZ plane, the anti-rotation portion 1023 can restrict the snap 1041 circumferentially, thereby preventing the electrode 104 from rotating relative to the ring 102.

[0151] The technical features of the above-disclosed embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0152] In the embodiments disclosed above, unless otherwise explicitly specified and limited, the execution order of each step is not restricted. For example, they can be executed in parallel or sequentially in different orders. The sub-steps of each step can also be executed alternately. Various forms of processes described above can be used, and steps can be reordered, added, or deleted, as long as the desired result of the technical solution provided in this application can be achieved, and this application does not impose any restrictions here.

[0153] The embodiments disclosed above merely illustrate several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of patent protection of this application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the scope of patent protection claimed by this application. Therefore, the scope of patent protection of this application should be determined by the appended claims.

Claims

1. A snare, characterized in that, include: A sheath assembly defining an axial proximal-distal direction; the sheath assembly includes an inner sheath and an outer sheath fitted over the inner sheath; Water injection connector, connected to the sheath assembly; A snare is inserted into the inner sheath, the snare having a first proximal position and a first distal position relative to the inner sheath along the axial proximal-distal direction; as well as The cutting section is fixed to the distal end of the ring and has an infusion port. When the snare is in the first proximal position, the cutting part abuts against the sheath assembly along the axial proximal-distal direction, so that the infusion port is connected to the sheath assembly; When the snare is in the first distal position, the snare protrudes from the distal end of the sheath assembly.

2. The snare device according to claim 1, characterized in that, The proximal radius of the cutting portion is greater than the distal radius of the inner sheath. When the loop is in the first proximal position, the proximal end of the cutting portion abuts against the distal end of the inner sheath, so that the infusion hole is connected to the inner sheath.

3. The snare device according to claim 1, characterized in that, The outer sheath has a second proximal position and a second distal position relative to the inner sheath along the axial proximal-distal direction; When the snare is at the first proximal position and the outer sheath is at the second proximal position, the cutting portion protrudes from the outer sheath; When the snare is in the first proximal position and the outer sheath is in the second distal position, the cutting portion is housed within the outer sheath.

4. The snare device according to claim 1, characterized in that, The outer sheath has a second proximal position and a second distal position relative to the inner sheath along the axial proximal-distal direction; Wherein, when the snare is at the first proximal position and the outer sheath is at the second proximal position, the cutting portion protrudes from the distal end of the outer sheath; When the snare is in the first proximal position and the outer sheath is in the second distal position, the proximal end of the cutting portion abuts against the distal end of the outer sheath, so that the infusion port is connected to the sheath assembly; When the snare is in the first distal position and the outer sheath is in the second distal position, the snare protrudes from the distal end of the sheath assembly.

5. The snare device according to claim 4, characterized in that, It also includes a connecting part, a limiting part, and a torque rope. The connecting part is fixed to the proximal end of the snare, the distal end of the torque rope is fixed to the connecting part and electrically connected to the snare, the torque rope passes through the inner sheath, the limiting part is fixed to the inner sheath, and the limiting part can abut against the connecting part to position the snare at the first proximal end position.

6. The snare device according to claim 5, characterized in that, The limiting part has an opening, and the infusion hole can be connected to the water injection connector through the opening.

7. The snare device according to claim 4, characterized in that, It also includes a sealing ring disposed at the distal end of the outer sheath for sealing contact with the cutting portion.

8. The snare device according to claim 1, characterized in that, The water injection connector is connected to the inner sheath; The snare also includes a seal for preventing liquid from flowing out of the proximal end of the water inlet connector.

9. The snare device according to claim 1, characterized in that, The proximal end of the cutting section includes a cutting edge, which is located between the two electrode wires of the loop, and the cutting edge of the cutting edge extends along the parallel direction of the two electrode wires.

10. The snare device according to claim 9, characterized in that, The distal end of the cutting section is provided with a conical protrusion; the two inlets of the infusion hole are located on both sides of the cutting edge, and the outlet of the infusion hole is located on the conical protrusion.

11. The snare according to claim 1, characterized in that, It also includes a sleeve, which is fixed to the outer sheath and used to adjust the relative position of the outer sheath and the inner sheath along the axial direction.

12. The snare according to claim 1, characterized in that, It also includes a locking mechanism, which includes a locking part and a locked part; the locking part is disposed on the outer sheath, and the locked part is fixedly connected to the inner sheath; the locking mechanism is used to lock the outer sheath at a second proximal position or a second distal position relative to the inner sheath.

13. The snare device according to claim 12, characterized in that, The locking part includes two slots spaced apart along the axial direction, and the locked part includes a buckle for engaging with the slots.

14. The snare according to claim 12, characterized in that, The locked portion includes a first toothed portion, and the locking portion includes a reset portion, an operating portion, and a second toothed portion; the reset portion is used to drive the second toothed portion to engage with the first toothed portion, thereby locking the outer sheath to the inner sheath along the axial proximal-rear direction; the operating portion is used to control the second toothed portion to disengage from the first toothed portion, so that the outer sheath can slide relative to the inner sheath along the axial proximal-rear direction.

15. The snare device according to claim 12, characterized in that, The locked portion includes a first toothed portion, and the locking portion includes an elastic cantilever, an operating portion, and a second toothed portion. The second toothed portion is connected to the outer sheath via the elastic cantilever. The elastic cantilever is used to drive the second toothed portion to engage with the first toothed portion, thereby locking the outer sheath to the inner sheath along the axial proximal-posterior direction. The operating portion is disposed on the elastic cantilever. The operating portion drives the second toothed portion to disengage from the first toothed portion, so that the outer sheath can slide relative to the inner sheath along the axial proximal-posterior direction.

16. The snare according to claim 12, characterized in that, The locked portion includes a first toothed portion, and the locking portion includes an operating portion, a sliding groove, and an elastic buckle. The sliding groove includes a first position and a second position. The operating portion is slidable between the first position and the second position. When the operating portion is in the first position, the outer sheath is slidable relative to the inner sheath along the axial proximal-posterior direction. When the operating portion is in the second position, the operating portion drives the elastic buckle to engage with the first toothed portion, thereby locking the outer sheath to the inner sheath along the axial proximal-posterior direction.

17. The snare according to any one of claims 14 to 16, characterized in that, The water injection connector is fixed to the inner sheath, and the first toothed portion is fixed to the water injection connector.

18. The snare device according to claim 12, characterized in that, It also includes a sleeve, which is fixed to the outer sheath, and the locking part is disposed on the sleeve.

19. The snare device according to claim 1, characterized in that, It also includes a ring, electrodes, and a push-pull rod; The ring is slidably connected to the sheath assembly along the axial direction from the proximal end, and the ring includes an electrode mounting groove; The electrode is fixed to the push-pull rod; The electrode includes an electrode post, a first locking part, and a second locking part. The first locking part and the second locking part are spaced apart along the electrode post and protrude from the side wall of the electrode post to clamp the two ends of the electrode mounting groove and lock the electrode to the ring.

20. The snare device according to claim 19, characterized in that, The electrode mounting groove is an elliptical groove; The first locking part can be inserted into the elliptical groove in a manner that is aligned with the long axis of the cross-section of the elliptical groove. When the first locking part deflects around the elliptical groove, the first locking part and the second locking part respectively clamp the two ends of the elliptical groove, locking the electrode to the ring.

21. The snare device according to claim 19, characterized in that, The first snap-fit ​​part is a spring buckle; the spring buckle enters from one end of the electrode mounting groove and exits from the other end of the electrode mounting groove and springs open, and together with the second snap-fit ​​part, clamps the two ends of the electrode mounting groove, locking the electrode to the ring.

22. A snare, characterized in that, include: A sheath assembly defining an axial proximal-distal direction; the sheath assembly includes an inner sheath and an outer sheath sleeved on the inner sheath, the outer sheath having a second proximal position and a second distal position relative to the inner sheath along the axial proximal-distal direction; A snare is inserted into the inner sheath, the snare having a first proximal position and a first distal position relative to the inner sheath along the axial proximal-distal direction; The cutting section is fixed to the distal end of the snare. as well as A locking mechanism for locking the outer sheath in the second proximal position or the second distal position; Wherein, when the snare is at the first proximal position and the outer sheath is at the second distal position, the outer sheath is fitted onto the cutting portion; When the snare is in the first distal position, the snare protrudes from the sheath assembly.

23. The snare according to claim 22, characterized in that, When the snare is in the first proximal position and the outer sheath is in the second proximal position, the cutting portion protrudes from the sheath assembly.

24. The snare according to claim 22, characterized in that, The proximal radius of the cutting portion is greater than the distal radius of the inner sheath. When the snare is in the first proximal position, the proximal end of the cutting portion abuts against the distal end of the inner sheath.

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