A multi-functional snare structure capable of single and bipolar switching and a snare

Abstract

The present invention discloses a multi-functional snare structure capable of single and bipolar switching and a snare device, relating to the technical field of medical devices, and can solve the problems that the snare structure of the existing snare device has a single function and cannot perform single and bipolar function switching. An embodiment of the present invention discloses a multi-functional snare structure capable of single and bipolar switching, which includes a first monofilament and a second monofilament both having the ability of elastic deformation, and an insulating connecting plate; the first monofilament and the second monofilament are both arranged in the sheath tube and are slidably connected thereto, and the ends of the first monofilament and the second monofilament both extend out of the sheath tube; the end of the first monofilament is fixedly connected to the insulating connecting plate; a marked end is provided at one end of the second monofilament extending out of the sheath tube, and the insulating connecting plate is slidably connected to the second monofilament and is located between the marked end and the sheath tube.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and particularly to a multi-functional snare structure and a snare that can be switched between monopolar and bipolar modes. Background Art

[0002] Snares are widely used in endoscopic surgeries, mainly for removing polyps or other diseased tissues. Among them, the snare structure is an important part of the snare. The snare structure of existing snares is usually made of a single metal wire, in a circular or oval shape. After the snare structure extends out of the sheath of the snare, the circular or oval snare structure can enclose the polyp or diseased tissue, and then power is applied to remove the polyp or diseased tissue.

[0003] There are still many defects in the snare structure of existing snares. For example:

[0004] First, the range of its size change is relatively fixed, and the size is fixed after the snare structure is made; second, the snare structure is either a single electrode or a double electrode, and cannot be converted into each other, so the application scenarios are relatively narrow; third, the function of the snare structure is relatively single, and it can only remove polyps and diseased tissues. During the process of removing polyps and diseased tissues, other medical devices are also needed for cooperation, such as water injection for elevation and marking, resulting in the need to replace and use multiple instruments during the entire polyp removal process, which makes the surgical process troublesome and has high instrument costs and time costs.

[0005] Based on the above background, the inventor designed a multi-functional snare structure and a snare that can be switched between monopolar and bipolar modes to solve at least one of the above problems. Thus, this application is proposed. Summary of the Invention

[0006] The purpose of this application is to provide a multi-functional snare structure and a snare that can be switched between monopolar and bipolar modes, so as to solve the problems of the single function of the snare structure of existing snares and the inability to switch between monopolar and bipolar functions.

[0007] To solve the above technical problems, the present invention adopts the following solutions:

[0008] On the one hand, this application provides a multi-functional snare structure that can be switched between monopolar and bipolar modes, including a first single wire and a second single wire both having the ability of elastic deformation, and an insulating connecting plate;

[0009] Both the first single wire and the second single wire are arranged in the sheath and are slidably connected thereto, and the ends of the first single wire and the second single wire both extend out of the sheath;

[0010] The end of the first single wire is fixedly connected to the insulating connecting plate;

[0011] A marking end is provided at one end of the second monofilament extending out of the sheath tube, and the insulating connection plate is slidably connected to the second monofilament and is located between the marking end and the sheath tube.

[0012] Optionally, a partition plate for dividing the internal channel of the sheath tube into a first channel and a second channel is provided in the sheath tube, and the partition plate is arranged parallel to the central axis of the sheath tube;

[0013] The first monofilament is arranged in the first channel and is slidably connected thereto;

[0014] The second monofilament is arranged in the second channel and is slidably connected thereto.

[0015] Optionally, the first monofilament, the second monofilament, and the marking end are all good conductors made of a metal material;

[0016] A sliding hole is provided on the insulating connection plate, and the second monofilament is slidably connected to the insulating connection plate through the sliding hole.

[0017] Optionally, a first liquid inlet channel is provided in the first monofilament;

[0018] An outlet for liquid is provided on the insulating connection plate and is communicated with the first liquid inlet channel.

[0019] Optionally, a second liquid inlet channel is provided in the second monofilament;

[0020] A liquid spraying port communicated with the second liquid inlet channel is provided in the marking end, and the size of the liquid spraying port is smaller than the size of the second liquid inlet channel.

[0021] On the other hand, the present application provides a multifunctional snare that can be switched between single and bipolar modes, including a multifunctional snare structure that can be switched between single and bipolar modes as described in any one of the above, and a handle body, and further includes;

[0022] A first slider and a second slider slidably connected to the handle body, and a first electrode connector and a second electrode connector respectively fixedly connected to the first slider and the second slider;

[0023] The first slider is fixedly connected to one end of the first monofilament away from the insulating connection plate through the first electrode connector, and the first electrode connector is fixedly connected to the first monofilament in an electrically conductive manner;

[0024] The second slider is fixedly connected to one end of the second monofilament away from the marking end through the second electrode connector, and the second electrode connector is fixedly connected to the second monofilament in an electrically conductive manner.

[0025] Optionally, a first liquid inlet channel is provided in the first monofilament;

[0026] It further includes a first liquid receiving head and a first liquid receiving pipe connected to the first liquid receiving head, and one end of the first liquid receiving pipe away from the first liquid receiving head is communicated with the first liquid inlet channel of the first monofilament.

[0027] Optionally, a second liquid inlet channel is provided in the second monofilament;

[0028] It further includes a second liquid receiving head and a second liquid receiving pipe connected to the second liquid receiving head. One end of the second liquid receiving pipe away from the second liquid receiving head is communicated with the second liquid inlet channel of the second monofilament.

[0029] Optionally, buckling chutes are provided on both sides of the handle body;

[0030] Both the first slider and the second slider are buckled on the handle body through the buckling chutes provided on both sides of the handle body and are slidably connected thereto;

[0031] A first chute and a second chute parallel to each other, and a damping plate located between the first chute and the second chute are further provided in the handle body;

[0032] A first sliding rod located in the first chute is provided on the first slider;

[0033] A second sliding rod located in the second chute is provided on the second slider;

[0034] In the state where the first slider is buckled on the handle body, the first sliding rod presses against the damping plate;

[0035] In the state where the second slider is buckled on the handle body, the second sliding rod presses against the damping plate.

[0036] Optionally, a plurality of damping holes distributed along the sliding direction of the first slider and the second slider are further provided on the damping plate;

[0037] The free ends of both the first sliding rod and the second sliding rod have arc-shaped curved surfaces, and the sizes of the free ends of the first sliding rod and the second sliding rod are both larger than the size of the damping holes.

[0038] Advantages of the present invention:

[0039] First, the present application can flexibly select to only extend the first monofilament or / and the second monofilament according to the actual scenario and requirements, realizing flexible switching of the single and bipolar functions, so that one instrument can be adapted to multiple specific application scenarios.

[0040] Second, a second liquid inlet channel is provided in the second monofilament in the present application, so that the instrument can not only be marked by the marking end provided at the end of the second monofilament, but also have the function of water injection swelling. And a first liquid inlet channel is provided in the first monofilament, so that the instrument of the present application also has the function of spraying a liquid containing drug particles.

[0041] III. Based on the damping holes provided on the damping plate of the handle body, this application achieves an obvious in-place clamping point feel at the positions of the damping holes, realizes flexible adjustment and control of the size of the snare structure, and enables one instrument to be adapted to polyps and diseased tissues of multiple sizes. Description of the Drawings

[0042] Figure 1 It is a schematic cross-sectional structure diagram of Embodiment 1 of this application in the retracted state.

[0043] Figure 2 It is a schematic cross-sectional structure diagram of Embodiment 1 of this application in the snare state with the monopole extended.

[0044] Figure 3 It is a schematic cross-sectional structure diagram of Embodiment 1 of this application in the marked state with the monopole extended.

[0045] Figure 4 It is a schematic cross-sectional structure diagram of Embodiment 2 of this application in the retracted state.

[0046] Figure 5 It is a schematic three-dimensional structure diagram of the snare structure of Embodiment 3 of this application in the retracted state.

[0047] Figure 6 It is a schematic cross-sectional structure diagram of the snare structure of Embodiment 3 of this application in the retracted state.

[0048] Figure 7 It is Figure 6 a partial enlarged structure diagram of the position A in

[0049] Figure 8 It is a schematic three-dimensional structure diagram of the snare structure of Embodiment 3 of this application in the snare state with the monopole extended.

[0050] Figure 9 It is a schematic three-dimensional structure diagram of the snare structure of Embodiment 3 of this application in the marked state with the monopole extended.

[0051] Figure 10 It is a schematic three-dimensional structure diagram of the snare structure of Embodiment 4 of this application in the retracted state.

[0052] Description of the Reference Numerals:

[0053] 1 - Sheath tube, 11 - Partition plate, 101 - First channel, 102 - Second channel, 2 - Snare structure, 21 - First monofilament, 211 - First liquid inlet channel, 22 - Second monofilament, 221 - Marked end, 222 - Second liquid inlet channel, 223 - Reduced diameter section, 224 - Liquid spraying port, 23 - Insulating connection plate, 231 - Sliding hole, 232 - Liquid outlet, 3 - Handle body, 301 - Buckling chute, 31 - Damping plate, 311 - Damping hole, 32 - First chute, 33 - Second chute, 41 - First slider, 411 - First slide bar, 42 - Second slider, 421 - Second slide bar, 51 - First electrode connector, 52 - Second electrode connector, 61 - First liquid receiving head, 611 - First liquid receiving pipe, 62 - Second liquid receiving head, 621 - Second liquid receiving pipe. Detailed implementation mode

[0054] The following combines the embodiments and the attached drawings to further elaborate on the present invention in detail, but the implementation modes of the present invention are not limited thereto.

[0055] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "longitudinal", "lateral", "horizontal", "inner", "outer", "front", "rear", "top", "bottom", etc. is based on the orientation or positional relationship shown in the attached drawings, or the orientation or positional relationship in which the product of this invention is usually placed during use. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention.

[0056] In the description of the present invention, it should also be noted that unless otherwise clearly specified and defined, the terms "set", "provided with", "installed", "connected", "connected to" 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 directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0057] The following details the present invention by referring to the attached drawings and combining with embodiments.

[0058] Embodiment 1:

[0059] As Figures 1 to 4 shown, this embodiment provides a multi-functional snare structure 2 that can be switched between single-pole and bipolar, including a first monofilament 21 and a second monofilament 22 both having the ability of elastic deformation, and an insulating connection plate 23;

[0060] Both the first monofilament 21 and the second monofilament 22 are arranged inside the sheath tube 1 and are slidably connected thereto, and the ends of the first monofilament 21 and the second monofilament 22 both extend outside the sheath tube 1;

[0061] The end of the first monofilament 21 is fixedly connected to the insulating connection plate 23;

[0062] One end of the second monofilament 22 extending out of the sheath tube 1 is provided with a marking end 221, and the insulating connection plate 23 is slidably connected to the second monofilament 22 and is located between the marking end 221 and the sheath tube 1.

[0063] In this embodiment, by providing the first monofilament 21 and the second monofilament 22 that can both freely extend, fixedly connecting the insulating connection plate 23 to the end of the first monofilament 21, providing the marking end 221 at the end of the second monofilament 22, and the insulating connection plate 23 being slidably connected to the second monofilament 22, and at the same time both the first monofilament 21 and the second monofilament 22 having the function of elastic deformation, the instrument of this embodiment:

[0064] When the first monofilament 21 slides forward while the second monofilament 22 remains stationary, due to the limitation of the marking end 221 at the end of the second monofilament 22, the insulating connection plate 23 cannot move forward, causing the first monofilament 21 to bend and deform, forming a variable-size snare structure 2 composed of the first monofilament 21, the insulating connection plate 23, and the second monofilament 22. At this time, the snare structure 2 of the instrument in this embodiment is in the state as Figure 2 shown;

[0065] When the first monofilament 21 remains stationary and the second monofilament 22 slides forward, since the insulating connection plate 23 is fixed to the end of the first monofilament 21 and is slidably connected to the second monofilament 22, only the second monofilament 22 can freely extend forward for the instrument. At this time, by making the second monofilament 22 conductive, the marking function can be realized by using the marking end 221 of the second monofilament 22. At this time, the snare structure 2 of the instrument in this embodiment is in the state as Figure 3 shown;

[0066] Therefore, in this embodiment, by providing the marking end 221 at the end of the second monofilament 22, providing the insulating connection plate 23 that is fixedly connected to the first monofilament 21 and is slidably connected to the second monofilament 22, and then through the functional cooperation of the elastic deformation of the first monofilament 21 and the second monofilament 22, the snare structure 2 of this embodiment has the marking and snare functions. In addition, due to the insulating property of the insulating connection plate 23, after the first monofilament 21 and the second monofilament 22 are simultaneously conductive, the current will not directly form a conductive path through the insulating connection plate 23, but will form a conductive path through the polyp wound surface or diseased tissue in contact with the first monofilament 21 and the second monofilament 22, and the coagulation treatment function after cutting the polyp or diseased tissue can be realized.

[0067] Therefore, the core concept of this embodiment lies in that, through the completely separated and freely slidable first monofilament 21 and second monofilament 22, as well as the marking end 221 provided at the end of the second monofilament 22, and the insulating connecting plate 23 fixed to the end of the first monofilament 21 and slidably connected to the second monofilament 22, an instrument can perform monopolar energized marking, snare cutting, and bipolar energized coagulation, realizing the advantage of integrating multiple functions required for endoscopic surgery into one.

[0068] Specifically, in this embodiment, as Figure 1 shown, a partition plate 11 for dividing the internal channel of the sheath tube 1 into a first channel 101 and a second channel 102 is provided inside the sheath tube 1, and the partition plate 11 is arranged parallel to the central axis of the sheath tube 1;

[0069] The first monofilament 21 is arranged in the first channel 101 and is slidably connected thereto;

[0070] The second monofilament 22 is arranged in the second channel 102 and is slidably connected thereto.

[0071] Due to the characteristics of endoscopic surgery, the length of the sheath tube 1 is generally long and is in a freely bendable state. In an actual working scenario, such as colonoscopy, the sheath tube 1 needs to be bent at least twice to be completely examined. And in this embodiment, by setting the partition plate 11, the first monofilament 21 and the second monofilament 22 can slide in the first channel 101 and the second channel 102 respectively, avoiding interference between the first monofilament 21 and the second monofilament 22 during the bending process of the sheath tube 1 and affecting the functional stability of the snare structure 2.

[0072] Specifically, in this embodiment, the first monofilament 21, the second monofilament 22, and the marking end 221 are all good conductors made of metal materials;

[0073] A sliding hole 231 is provided on the insulating connecting plate 23, and the second monofilament 22 is slidably connected to the insulating connecting plate 23 through the sliding hole 231. The first monofilament 21 and the second monofilament 22 in this embodiment are both monofilaments made of stainless steel, having good elastic deformation ability and metal conductivity. Those skilled in the art can select other materials according to needs, and no further examples will be given here.

[0074] Embodiment 2:

[0075] As Figure 4 shown, in this embodiment, a first liquid inlet channel 211 is provided inside the first monofilament 21;

[0076] The insulating connection plate 23 is provided with a liquid outlet 232 communicating with the first liquid inlet channel 211, enabling this embodiment to have the function of spraying a liquid containing drug particles. After cutting the diseased tissue or polyp, the liquid medicine, such as anti-inflammatory liquid medicine, can be accurately sprayed onto the wound surface through the first liquid inlet channel 211 and the liquid outlet 232 of the insulating connection plate 23, accelerating the recovery of the wound surface.

[0077] As Figure 4 shown, in this embodiment, a second liquid inlet channel 222 is provided inside the second monofilament 22;

[0078] The marking end 221 is provided with a liquid spraying port 224 communicating with the second liquid inlet channel 222, and the size of the liquid spraying port 224 is smaller than that of the second liquid inlet channel 222. By setting the liquid spraying port 224 in this embodiment, the instrument can not only use the marking end 221 provided at the end of the second monofilament 22 for marking, but also has the function of water injection and swelling. When the doctor performs the cutting operation, there is no need to switch to another instrument for marking and water injection and swelling, effectively saving the operation time, improving the operation efficiency, and at the same time reducing the number of instruments and the operation cost.

[0079] In this embodiment, a reduced diameter section 223 is further provided between the liquid spraying port 224 and the second liquid inlet channel 222, so that the liquid in the second liquid inlet channel 222 can be pressurized and sprayed out from the liquid spraying port 224 to form a high-pressure water beam and be injected into the polyp or diseased tissue to make it swell, facilitating the subsequent cutting process.

[0080] The remaining structures of this embodiment are the same as those of the above-mentioned Embodiment 1 and will not be elaborated here.

[0081] Embodiment 3:

[0082] As Figures 5 to 9 shown, this embodiment provides a multifunctional snare that can be switched between monopolar and bipolar, including a multifunctional snare structure 2 that can be switched between monopolar and bipolar described in the above-mentioned Embodiment 1, and a handle body 3, and further includes;

[0083] A first slider 41 and a second slider 42 slidably connected to the handle body 3, and a first electrode connector 51 and a second electrode connector 52 respectively fixedly connected to the first slider 41 and the second slider 42;

[0084] The first slider 41 is fixedly connected to one end of the first monofilament 21 away from the insulating connection plate 23 through the first electrode connector 51, and the first electrode connector 51 is conductively fixedly connected to the first monofilament 21;

[0085] The second slider 42 is fixedly connected to one end of the second monofilament 22 away from the marking end 221 through the second electrode connector 52, and the second electrode connector 52 is conductively fixedly connected to the second monofilament 22.

[0086] In the embodiment, by only driving the second slider 42 to slide forward on the handle body 3, the second monofilament 22 can be made to extend forward out of the sheath 1. At this time, the first slider 41 is kept stationary. Then, by only conducting electricity to the second monofilament 22 through the second electrode connector 52, the marking end 221 at the end of the second monofilament 22 can be used to mark the position of the polyp or diseased tissue. At this time, the state of the instrument in this embodiment is as Figure 9 shown.

[0087] In this embodiment, by driving the first slider 41 to slide forward on the handle body 3, the first monofilament 21 can be made to extend forward out of the sheath 1. At this time, the second slider 42 is kept stationary, which will cause the first monofilament 21 to continuously deform during the forward extension process to form a snare structure 2, realizing the snare function. Then, by respectively conducting electricity to the first monofilament 21 and the second monofilament 22 through the first electrode connector 51 and the second electrode connector 52, the functions of electrocautery and blood coagulation can be realized. At this time, the state of the instrument in this embodiment is as Figure 8 shown.

[0088] In this embodiment, according to the size of the polyp or diseased tissue, the distance that the first slider 41 slides out can be flexibly driven to adjust the size of the snare structure 2 to adapt to the size of the polyp or diseased tissue.

[0089] In some embodiments, the first monofilament 21 or the second monofilament 22 can be selected to be made of shape memory alloy, that is, its natural state after extension is semi-circular. When the first monofilament 21 and the second monofilament 22 are simultaneously pushed out, after the first slider 41 and the second slider 42 move forward to the end limit, the maximum size of the snare structure 2 can be obtained to adapt to polyps and diseased tissues of more sizes. The distances that the first slider 41 and the second slider 42 can slide forward can be set by those skilled in the art according to needs, which will not be elaborated here.

[0090] Specifically, in this embodiment, as Figure 5 shown, snap-in chutes 301 are provided on both sides of the handle body 3;

[0091] Both the first slider 41 and the second slider 42 are snap-fitted on the handle body 3 through the snap-in chutes 301 provided on both sides of the handle body 3 and are slidably connected thereto;

[0092] A first chute 32 and a second chute 33 that are parallel to each other, and a damping plate 31 located between the first chute 32 and the second chute 33 are further provided inside the handle body 3;

[0093] A first slide bar 411 located in the first chute 32 is provided on the first slider 41;

[0094] A second slide bar 421 located in the second chute 33 is provided on the second slider 42;

[0095] In the state where the first slider 41 is latched onto the handle body 3, the first sliding rod 411 presses against the damping plate 31;

[0096] In the state where the second slider 42 is latched onto the handle body 3, the second sliding rod 421 presses against the damping plate 31.

[0097] By providing the latching chute 301, and with both the first sliding rod 411 and the second sliding rod 421 pressing against the damping plate 31, there is a certain frictional resistance between the first sliding rod 411 and the damping plate 31, and between the second sliding rod 421 and the damping plate 31. This enables the doctor to conveniently adjust and pause when moving the positions of the first slider 41 and the second slider 42, thereby flexibly adjusting the extended lengths of the first monofilament 21 and the second monofilament 22.

[0098] Specifically, in this embodiment, as Figure 6 and Figure 7 shown, a plurality of damping holes 311 are further provided on the damping plate 31 of the handle body 3, which are equally spaced along the sliding direction of the first slider 41 and the second slider 42;

[0099] The free ends of both the first sliding rod 411 and the second sliding rod 421 have arc-shaped curved surfaces, and the sizes of the free ends of the first sliding rod 411 and the second sliding rod 421 are both larger than the size of the damping hole 311.

[0100] The damping holes 311 provided on the damping plate 31 of the handle body 3 in this embodiment achieve an obvious sense of a stop point in place at the positions of the damping holes 311, enabling flexible adjustment and control of the size of the snare structure 2, and making one instrument adaptable to polyps and diseased tissues of multiple sizes.

[0101] The remaining structures of this embodiment are the same as those of the above-mentioned Embodiment 1 and will not be elaborated here.

[0102] Embodiment 4:

[0103] As Figure 10 shown, on the basis of the above-mentioned Embodiments 2 and 3, in this embodiment, a first liquid inlet channel 211 is provided inside the first monofilament 21;

[0104] It further includes a first liquid receiving head 61 and a first liquid receiving pipe 611 connected to the first liquid receiving head 61. One end of the first liquid receiving pipe 611 away from the first liquid receiving head 61 is communicated with the first liquid inlet channel 211 of the first monofilament 21. Through the first liquid receiving head 61 and the first liquid receiving pipe 611, the instrument of this embodiment can accurately spray a liquid medicine, such as an anti-inflammatory liquid medicine, onto the wound surface through the first liquid receiving pipe 611, the first liquid inlet channel 211, and the liquid outlet 232 of the insulating connection plate 23, accelerating the recovery of the wound surface.

[0105] Specifically, in this embodiment, as Figure 10 shown, a second liquid inlet channel 222 is provided in the second monofilament 22;

[0106] It further includes a second liquid receiving head 62 and a second liquid receiving pipe 621 connected to the second liquid receiving head 62. One end of the second liquid receiving pipe 621 away from the second liquid receiving head 62 communicates with the second liquid inlet channel 222 of the second monofilament 22. By providing the second liquid receiving head 62 and the second liquid receiving pipe 621, the instrument of this embodiment can also eject a high-pressure liquid beam through the second liquid receiving pipe 621, the second liquid inlet channel 222 and the liquid spraying port 224 on the marking end 221 to achieve the swelling of polyps or diseased tissues. In this embodiment, the liquid introduced into the second liquid receiving head 62 is usually water.

[0107] The remaining structures of this embodiment are the same as those of the above-mentioned Embodiment 3 and will not be described in detail here.

[0108] It can be understood that the above embodiments are merely exemplary embodiments adopted to illustrate the principle of the present invention. However, the present invention is not limited thereto. For those of ordinary skill in the art, various deformations and improvements can be made without departing from the spirit and essence of the present invention, and these deformations and improvements are also regarded as the protection scope of the present invention.

Claims

1. A multifunctional trap structure capable of single-pole and bipolar switching, characterized in that: It comprises a first monofilament (21) and a second monofilament (22) both having elastic deformation capability, and an insulating connecting plate (23); The first monofilament (21) and the second monofilament (22) are both arranged in the sheath tube (1) and slidably connected thereto, and the ends of the first monofilament (21) and the second monofilament (22) can both extend out of the sheath tube (1); The end of the first monofilament (21) is fixedly connected to the insulating connecting plate (23); One end of the second monofilament (22) that can extend out of the sheath tube (1) is provided with a marking end (221), the insulating connecting plate (23) is slidably connected to the second monofilament (22), and the insulating connecting plate (23) is restricted by the marking end (221) at the end of the second monofilament (22) and cannot move forward, so that the first monofilament (21) is bent and deformed; The first monofilament (21), the second monofilament (22), and the marking end (221) are all good conductors made of metal material.

2. A multifunctional trap structure capable of single-pole and bipolar switch according to claim 1, characterized in that: The sheath tube (1) is provided with a partition plate (11) for partitioning its internal channel into a first channel (101) and a second channel (102), and the partition plate (11) is arranged parallel to the central axis of the sheath tube (1); The first monofilament (21) is disposed in the first channel (101) and is slidably connected thereto; The second monofilament (22) is disposed in the second channel (102) and is slidably connected thereto.

3. A multifunctional trap structure capable of single-pole and bipolar switch according to claim 1, characterized in that: The insulating connecting plate (23) is provided with a sliding hole (231), and the second monofilament (22) is slidably connected to the insulating connecting plate (23) through the sliding hole (231).

4. A multifunctional trap structure capable of single-pole and bipolar switch according to claim 1, characterized in that: A first liquid inlet channel (211) is provided in the first monofilament (21); The insulating connecting plate (23) is provided with a liquid outlet (232) which is in communication with the first liquid inlet channel (211).

5. The multifunctional trap structure capable of single-pole and bipolar switch according to claim 1, characterized in that: A second liquid inlet channel (222) is provided in the second monofilament (22); The marking end (221) is provided with a liquid spraying port (224) in communication with the second liquid inlet channel (222); the size of the liquid spraying port (224) is smaller than the size of the second liquid inlet channel (222).

6. A multifunctional snare capable of switching between single and double poles, characterized in that: It comprises a multifunctional snare structure (2) capable of switching between single and double poles as claimed in any one of claims 1 to 5, and a handle body (3), and further comprises: A first sliding block (41) and a second sliding block (42) slidably connected to the handle body (3), and a first electrode connector (51) and a second electrode connector (52) respectively fixedly connected to the first sliding block (41) and the second sliding block (42); The first slider (41) is fixedly connected to an end of the first monofilament (21) away from the insulating connecting plate (23) via a first electrode connector (51), and the first electrode connector (51) is conductively and fixedly connected to the first monofilament (21); The second slider (42) is fixedly connected to an end of the second monofilament (22) away from the marking end (221) via a second electrode connector (52), and the second electrode connector (52) is conductively and fixedly connected to the second monofilament (22).

7. The multifunctional snare capable of switching between single and double poles according to claim 6, characterized in that: A first liquid inlet channel (211) is provided in the first monofilament (21); It also comprises a first liquid receiving head (61) and a first liquid receiving pipe (611) connected to the first liquid receiving head (61); one end of the first liquid receiving pipe (611) away from the first liquid receiving head (61) is in communication with a first liquid inlet channel (211) of the first monofilament (21).

8. The multifunctional snare capable of switching between single and double poles according to claim 6, characterized in that: A second liquid inlet channel (222) is provided in the second monofilament (22); It also comprises a second liquid receiving head (62) and a second liquid receiving pipe (621) connected to the second liquid receiving head (62); one end of the second liquid receiving pipe (621) away from the second liquid receiving head (62) is connected to the second liquid inlet channel (222) of the second monofilament (22).

9. The multifunctional snare capable of switching between single and double poles according to claim 6, characterized in that: The handle body (3) is provided with buckling sliding grooves (301) on both sides; The first sliding block (41) and the second sliding block (42) are both buckled onto the handle body (3) through buckling sliding grooves (301) provided on both sides of the handle body (3) and are slidably connected thereto; A first sliding groove (32) and a second sliding groove (33) which are parallel to each other, and a damping plate (31) located between the first sliding groove (32) and the second sliding groove (33) are also provided in the handle body (3); The first sliding block (41) is provided with a first sliding rod (411) located in the first sliding groove (32); The second sliding block (42) is provided with a second sliding rod (421) located in the second sliding groove (33); When the first sliding block (41) is buckled onto the handle body (3), the first sliding bar (411) presses against the damping plate (31); When the second sliding block (42) is buckled onto the handle body (3), the second sliding bar (421) presses against the damping plate (31).

10. The multifunctional snare capable of switching between single and double poles according to claim 9, characterized in that: The damping plate (31) is further provided with a plurality of damping holes (311) distributed along the sliding direction of the first sliding block (41) and the second sliding block (42); The free ends of the first sliding rod (411) and the second sliding rod (421) both have arc-shaped curved surfaces, and the sizes of the free ends of the first sliding rod (411) and the second sliding rod (421) are both larger than the sizes of the damping hole (311).

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