Electrode structure and radio frequency ablation tip

Abstract

The utility model relates to an electrode structure and radio frequency ablation cutter head. The electrode structure, including the insulating seat, electrode piece, with the insulating seat top surface is opposite, along the axial through opening has the suction hole and the limiting slot, the limiting slot is along the radial outward opening and forms the sharp angle between the limiting slot inner wall and the electrode piece outer peripheral surface, and electrode wire, two ends along the axial through the limiting slot to with the insulating seat fixed, to hold the electrode piece and limit between self and the insulating seat, because the electrode piece is held and limited through the electrode wire and the insulating seat, will not cause the loosing due to the pin corrosion, effectively improved the stability of the motor structure of the application, in addition, on one hand, the sharp angle structure can make the charge concentrate in the limiting slot edge, to realize directional ablation, ensure that the scrap is directional ablation as small particle, avoid the blockage, on the other hand, the limiting slot has the limiting effect to the electrode wire and directional ablation effect, improved the ablation efficiency of electrode structure whole.

Description

Technical Field

[0001] This utility model relates to the technical field of radiofrequency ablation blades, and in particular to an electrode structure and a radiofrequency ablation blade. Background Technology

[0002] With the continuous advancement of medical technology, radiofrequency ablation technology has been widely used in the medical field.

[0003] Existing radiofrequency ablation tips mostly use tungsten / molybdenum alloy electrode structures, relying on protruding small balls or pins to hang electrode plates (such as bent pins). However, in high-voltage radiofrequency environments, the contact area between the electrode plate and the fixing component may gradually wear down due to continuous erosion, eventually causing the electrode plate to fall off.

[0004] In addition, the electrode plates in the existing radiofrequency ablation head electrode structure have a dispersed charge distribution and poor ablation directionality, which makes the suction hole easy to be blocked by large tissue debris. Utility Model Content

[0005] Therefore, it is necessary to provide an electrode structure and radiofrequency ablation head that is stable, reliable, and less prone to clogging, addressing the issues of electrode plates easily detaching and clogging in current radiofrequency ablation head electrode structures.

[0006] This application first provides an electrode structure, including

[0007] Insulating base;

[0008] The electrode sheet abuts against the top surface of the insulating base and has a suction hole and a limiting groove through it along the axial direction. The limiting groove opens outward in the radial direction and the inner wall of the limiting groove forms a sharp angle with the outer peripheral surface of the electrode sheet.

[0009] The electrode wire extends axially through the limiting groove at both ends and is fixed to the insulating seat to confine the electrode sheet between itself and the insulating seat.

[0010] In one embodiment, the electrode structure includes two electrode wires, and four limiting grooves are equally spaced along the circumference on the electrode sheet, with each electrode wire having two ends corresponding to and passing through two different limiting grooves.

[0011] In one embodiment, each of the electrode wires includes an ablation section and fixed sections located at both ends of the ablation section. The ablation section is located on the side of the electrode sheet away from the insulating base, and the fixed sections extend axially through the limiting groove to be fixed to the insulating base.

[0012] The axial projections of the ablation segments of the two electrode wires are parallel or intersecting.

[0013] In one embodiment, at least one of the ablation segments is projected axially through the suction hole.

[0014] In one embodiment, at least one of the ablation segments is bent and the projection of the bend angle along the axial direction is located within the suction hole.

[0015] In one embodiment, each of the limiting grooves is distributed circumferentially around the suction hole, and the inner wall of the suction hole includes a plurality of first sidewalls corresponding one-to-one with each of the limiting grooves. Each first sidewall is contoured to the inner wall of the corresponding limiting groove, and at least one sharp corner is provided between two adjacent first sidewalls.

[0016] In one embodiment, the inner wall of the suction hole further includes a second sidewall, and two adjacent first sidewalls are connected by the second sidewall, with a sharp angle formed between the first sidewall and the second sidewall.

[0017] In one embodiment, the insulating base includes a base and a plurality of protrusions protruding from the top surface of the base. The electrode sheet abuts against the top surface of each of the protrusions to form a lateral absorption port between the electrode sheet and the base, which communicates inward with the suction hole and outward with the outside.

[0018] In one embodiment, the axial projection of the limiting groove is located within the protrusion, and the electrode wire passes through the limiting groove into the protrusion.

[0019] This application also provides a radiofrequency ablation tip, including a reinforcement tube, a suction passage, a first insulating tube, a second insulating tube, a handle, and the aforementioned electrode structure. The insulating base has a through hole corresponding to the suction hole along the axial direction.

[0020] One end of the first insulating tube is connected to the insulating base, and the other end is connected to the handle;

[0021] The suction passage is located inside the first insulating tube, with one end connected to the through hole and the other end extending into the handle;

[0022] One end of the electrode wire passes through the insulating base and the first insulating tube to the handle, and the portion of the electrode wire located inside the first insulating tube is also fitted with the second insulating tube;

[0023] The reinforcing tube is made of metal and is sleeved on the outside of the first insulating tube and fixed to the insulating base;

[0024] The handle is electrically connected to the electrode wire and the electrode sheet.

[0025] The above-mentioned electrode structure clamps and fixes the electrode sheet by cooperating with the electrode wire and the insulating seat. Since the fixing point of the electrode wire is located inside the insulating seat, it will not loosen due to corrosion, which effectively improves the stability of the motor structure of this application.

[0026] The limiting groove opens radially outwards, and the inner wall of the limiting groove forms a sharp angle with the outer peripheral surface of the electrode sheet. On the one hand, the sharp angle structure can concentrate the charge at the edge of the limiting groove, thereby achieving directional ablation and ensuring that the debris is directionally ablated into small particles to avoid blockage. On the other hand, the limiting groove has both the limiting effect on the electrode wire and the directional ablation effect, which improves the overall ablation efficiency of the electrode structure. Attached Figure Description

[0027] Figure 1 This is a perspective view of one embodiment of the electrode structure of this application;

[0028] Figure 2 for Figure 1 Front view of the middle electrode plate;

[0029] Figure 3 for Figure 1 A schematic diagram of one of the electrode wires;

[0030] Figure 4 This is a perspective view of another embodiment of the electrode structure of this application;

[0031] Figure 5 This is a perspective view of another embodiment of the electrode structure of this application;

[0032] Figure 6 This is a front view of the electrode sheet according to another embodiment of the electrode structure of this application;

[0033] Figure 7 for Figure 4 A 3D view of the area behind the hidden electrode sheet;

[0034] Figure 8 This is a schematic diagram showing the radiofrequency ablation tip of this application after concealing the first insulating tube and the FEP heat shrink tubing.

[0035] Figure 9 This is an oblique cross-sectional view of the radiofrequency ablation tip of this application.

[0036] Reference numerals: 10, insulating base; 11, base; 12, protrusion; 13, lateral absorption port; 20, electrode plate; 21, suction hole; 211, first side wall; 212, second side wall; 22, limiting groove; 30, electrode wire; 31, ablation section; 32, fixing section; 200, reinforcing tube; 300, suction passage pipe; 400, first insulating tube; 500, second insulating tube; 600, FEP heat shrink tubing. Detailed Implementation

[0037] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model 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 utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0038] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "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 are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to 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 utility model.

[0039] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0040] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0041] In this utility model, unless otherwise explicitly 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.

[0042] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0043] Please combine Figure 1 as well as Figure 2 As shown, this application first provides an electrode structure, including an insulating base 10; an electrode sheet 20, which abuts against the top surface of the insulating base 10, and has a suction hole 21 and a limiting groove 22 that are axially through it, the limiting groove 22 opening outward in the radial direction and the inner wall of the limiting groove 22 forming a sharp angle with the outer peripheral surface of the electrode sheet 20; and an electrode wire 30, with both ends axially passing through the limiting groove 22 to be fixed to the insulating base 10, so as to clamp and limit the electrode sheet 20 between itself and the insulating base 10.

[0044] In this application, the electrode wire 30 and the insulating seat 10 are used to clamp the limiting electrode piece 20. Since the fixing point of the electrode wire 30 is located inside the insulating seat 10, it will not loosen due to corrosion, which effectively improves the stability of the motor structure of this application.

[0045] The limiting groove 22 opens outward in the radial direction and forms a sharp angle between the inner wall of the limiting groove 22 and the outer peripheral surface of the electrode plate 20. On the one hand, the sharp angle structure can concentrate the charge at the edge of the limiting groove 22, thereby achieving directional ablation and ensuring that the debris is directionally ablated into small particles to avoid clogging.

[0046] On the other hand, since the limiting groove 22 can limit the electrode wire 30 while also independently achieving directional ablation, multi-position ablation can be achieved by combining the suction hole 21 and the limiting groove 22, which improves the overall ablation efficiency of the electrode structure and further reduces the possibility of blockage.

[0047] It is worth mentioning that in traditional electrode structures, the electrode wire 30 and the electrode sheet 20 are mostly fixed by hanging points or clamping points. The fixing effect will gradually fail as the hanging points or clamping points continue to erode. Therefore, the connection position of the electrode wire 30 and the electrode sheet 20 in traditional electrode structures usually needs to avoid charge concentration.

[0048] In this application, the electrode sheet 20 is clamped and limited by the electrode wire 30 and the insulating seat 10. In other words, the electrode sheet 20 and the electrode wire 30 are not fixed by hanging points or locking points. Therefore, the continuous ablation between the electrode wire 30 and the electrode sheet 20 caused by the high voltage radio frequency environment will not affect the fixation effect. This allows the application to utilize the limiting groove 22 through which the electrode wire 30 passes, and to increase the overall ablation efficiency of the electrode structure by forming a sharp corner in the limiting groove 22.

[0049] Specifically, the electrode wire 30 is fixed to the insulating base 10 by adhesive dots or other commonly used fixing methods; more specifically, the electrode wire 30 is made of tungsten wire with a diameter of 0.35mm; the electrode sheet 20 is made of pure tungsten material with a thickness of 0.25mm~0.35mm; the use of tungsten wire and tungsten sheet materials results in a longer service life and easier control of the position and intensity of charge concentration, enabling directional ablation, which is beneficial for instrument practice and surgical error tolerance, while also having a longer service life and a higher instrument yield rate; of course, the materials and dimensions of the electrode wire 30 and the insulating base 10 can be adjusted according to actual needs, which will not be listed in detail here.

[0050] In some embodiments, the inner wall of the limiting groove 22 is a smooth curved surface. On the one hand, the charge distribution on the smooth curved surface is more dispersed, which can further concentrate the charge at the sharp corner of the inner wall of the limiting groove 22. On the other hand, it can also reduce the possibility of deformation or damage to the inner wall of the limiting groove 22 caused by the collision between the electrode wire 30 and the inner wall of the limiting groove 22. Preferably, the inner wall of the limiting groove 22 is an arc surface.

[0051] In some embodiments, the size of the outward opening of the limiting groove 22 is larger than the diameter of the electrode wire 30, so that the electrode wire 30 can be installed into the limiting groove 22 through the lateral opening, thereby reducing the assembly difficulty of the electrode structure of this application.

[0052] Please combine Figure 1 as well as Figure 2 As shown, in some embodiments, the electrode structure includes two electrode wires 30, and four limiting grooves 22 are equally spaced along the circumference on the electrode sheet 20. The two ends of each electrode wire 30 correspond to and pass through two different limiting grooves 22.

[0053] It is easy to understand that, compared to a single electrode wire 30, two electrode wires 30 can avoid the tilting or deflection of the electrode plate 20 caused by single-point fixation, thus improving the fixation stability of the electrode plate 20.

[0054] The circumferentially spaced limiting grooves 22 ensure that the electrode sheet 20 is subjected to symmetrical and uniform force, avoiding damage or even breakage of the electrode sheet 20 due to excessive local stress. In addition, since each limiting groove 22 has a sharp corner structure, the circumferentially spaced limiting grooves 22 also ensure that the edge of the electrode sheet 20 is uniformly arranged with sharp corner structures, thereby ensuring that tissue debris can be uniformly dissolved into small particles by each sharp corner structure, reducing the risk of blockage.

[0055] Of course, in some other embodiments, the number of electrode wires 30 and corresponding limiting grooves 22 can be adjusted according to actual needs, which will not be listed here.

[0056] Please combine Figure 1 , Figure 3 as well as Figure 4 As shown, in some embodiments, each electrode wire 30 includes an ablation section 31 and a fixing section 32 located at both ends of the ablation section 31. The ablation section 31 is located on the side of the electrode sheet 20 away from the insulating base 10, and the fixing section 32 passes through the limiting groove 22 along the axial direction to be fixed to the insulating base 10. The axial projections of the ablation sections 31 of the two electrode wires 30 are parallel or intersecting.

[0057] Specifically, when the projections of the ablation segments 31 of the two electrode wires 30 along the axial direction are parallel, the charge distribution of the two ablation segments 31 is relatively uniform, and the energy is dispersed to the two ablation segments 31 to reduce the possibility of single-point overload, thereby extending the service life of the electrode structure of this application.

[0058] More specifically, in some embodiments, the projections of the two electrode wires 30 along the axial direction both pass through the suction hole 21, so that the suction hole 21 is divided into three ablation zones by the two electrode wires 30. The tissue debris ablated and cut by the two electrode wires 30 and the edge of the suction hole 21 can be directly absorbed by the opposite suction hole 21, so as to improve the suction efficiency of the electrode structure of this application.

[0059] Furthermore, when the ablation sections 31 of the two electrode wires 30 intersect along the axial direction, a high-intensity arc zone can be formed at the intersection of the two electrode wires 30, achieving a highly efficient and precise ablation effect.

[0060] Furthermore, in some embodiments, the axial projection of the intersection of the two electrode wires 30 is located within the suction hole 21, so that the suction hole 21 is divided into four ablation zones by the two electrode wires 30. The two electrode wires 30, together with the edge of the suction hole 21, can ablate large tissue into tiny fragments in four directions and absorb them through the suction hole 21, thereby improving the cutting ability of the electrode structure of this application to tissue fragments and further reducing the possibility of blockage.

[0061] Please combine Figure 1as well as Figure 4 As shown, in some embodiments, at least one ablation segment 31 is projected axially through the suction hole 21.

[0062] Since the edge of the suction hole 21 can also release energy and have an ablation effect, the projection of the ablation segment 31 along the axial direction through the suction hole 21 can form at least two closed ablation zones with the projection of the edge of the suction hole 21 along the vertical direction, so as to ablate and cut large tissues into smaller tissue fragments along the edge of the ablation zone, reducing the possibility of blockage.

[0063] In addition, each ablation zone is directly aligned with the suction port 21 along the axial direction, so the tissue debris after ablation and cutting can be directly sucked into the suction port 21 through the shortest path under the action of suction, thereby further reducing the possibility of blockage.

[0064] Please refer to Figure 5 As shown, in some embodiments, at least one ablation segment 31 is bent, and the projection of the bend along the axial direction lies within the suction port 21. It should be understood that the charge is more concentrated at the bend location, making it easier to initiate and ablate.

[0065] By bending the ablation section 31 to form an angle, on the one hand, the ablation effect at the angle position can adapt to the large blockage caused by the attraction force during the electrode's unactivated process. When tissue accumulates on the surface of the electrode sheet 20 or is slightly inserted into the suction hole 21, the electrode structure can cut and remove the tissue after activation, thereby improving the ablation efficiency of the electrode structure of this application.

[0066] On the other hand, with the position of the limiting groove 22 fixed, the area of ​​each ablation zone can be controlled by adjusting the position and angle of the bend, so that the projected area of ​​each ablation zone along the axial direction is closer, thereby realizing the ablation and cutting of large tissues into tissue fragments of uniform size, avoiding the blockage caused by the excessive volume of the cut tissue fragments.

[0067] Preferably, the projection of the angle of the ablation segment 31 along the axial direction is located at the center of the suction hole 21.

[0068] Please combine Figure 2 as well as Figure 6 As shown, in some embodiments, each limiting groove 22 is distributed around the suction hole 21 in the circumferential direction. The inner wall of the suction hole 21 includes a plurality of first sidewalls 211 that correspond one-to-one with each limiting groove 22. Each first sidewall 211 corresponds to the inner wall of the corresponding limiting groove 22 in a contoural manner. At least one sharp corner is provided between two adjacent first sidewalls 211.

[0069] Each limiting groove 22 is distributed around the suction hole 21 in the circumferential direction. The inner wall of the suction hole 21 includes a plurality of first sidewalls 211 that correspond one-to-one with each limiting groove 22. Each first sidewall 211 corresponds to the inner wall of the corresponding limiting groove 22 in the contour. A sharp corner is formed between two adjacent first sidewalls 211. Two adjacent first sidewalls 211 are directly connected, or the inner wall of the suction hole 21 also includes a second sidewall 212, and two adjacent first sidewalls 211 are connected through the second sidewall 212.

[0070] The first sidewall 211 is contoured to correspond to the inner wall of the corresponding limiting groove 22, meaning that the first sidewall 211 is arc-shaped and the bending direction is the same as the inner wall of the corresponding limiting groove 22. It should be understood that the contoured design of the first sidewall 211 enables this application to obtain a relatively larger suction hole 21 area on an electrode sheet 20 with a certain area, thereby maximizing absorption efficiency and reducing the possibility of blockage. The sharp corner formed between the two first sidewalls 211 can concentrate the charge, thereby improving the ablation effect of the suction hole 21.

[0071] Specifically, when two adjacent first sidewalls 211 are directly connected, the included angle between the two first sidewalls 211 is smaller, the charge accumulation effect is more obvious, and thus a more significant ablation effect can be obtained.

[0072] In some embodiments, the inner wall of the suction hole 21 further includes a second sidewall 212, and two adjacent first sidewalls 211 are connected by the second sidewall 212, forming a sharp angle between the first sidewall 211 and the second sidewall 212.

[0073] When two adjacent first sidewalls 211 are connected by a second sidewall 212, more angles can be formed between the two adjacent first sidewalls 211, that is, more ablation points can be formed to ablate and cut large tissues into smaller tissue fragments.

[0074] Preferably, the first sidewall 211 is bent toward the center of the suction hole 21 so that the included angle formed between adjacent first sidewalls 211 is smaller.

[0075] Please combine Figure 4 as well as Figure 7 As shown, in some embodiments, the insulating base 10 includes a base 11 and a plurality of protrusions 12 protruding from the top surface of the base 11. The electrode sheet 20 abuts against the top surface of each protrusion 12 to form a lateral absorption port 13 between the electrode sheet 20 and the base 11, which communicates inward with the suction hole 21 and outward with the outside.

[0076] Specifically, each lateral absorption port 13 is distributed circumferentially and communicates inward with the suction hole 21 and outward with the outside world; so that multi-position absorption can be achieved through the suction hole 21 and each lateral absorption port 13, thereby improving the absorption range and absorption effect of the electrode structure of this application on tissue debris.

[0077] More specifically, the sharp-angled structures of each limiting groove 22 located at the edge of the electrode sheet 20 ablate and cut the tissue, and the resulting tissue debris can be simultaneously sucked in by the suction hole 21 and the nearby lateral absorption port 13, so as to improve the absorption capacity of the electrode structure of this application for tissue debris.

[0078] Please combine Figure 4 as well as Figure 7 As shown, in some embodiments, the projection of the limiting groove 22 along the axial direction is located inside the protrusion 12, and the electrode wire 30 passes through the limiting groove 22 into the protrusion 12 to increase the volume of the electrode wire 30 inserted into the insulating seat 10 and increase the fixation reliability between the electrode wire 30 and the insulating seat 10.

[0079] Please combine Figure 8 as well as Figure 9 As shown, this application also provides a radiofrequency ablation tip, including a reinforcing tube 200, a suction passage 300, a first insulating tube 400, a second insulating tube 500, a handle, and the aforementioned electrode structure. The insulating base 10 has a through hole corresponding to the suction hole 21 extending through it axially. One end of the first insulating tube 400 is connected to the step of the through hole of the insulating base 10, and the other end is located inside the handle and connected to the handle. The suction passage 300 is located inside the first insulating tube 400, with one end communicating with the through hole and the other end extending into the handle. One end of the electrode wire 30 passes through the insulating base 10, the first insulating tube 400, and into the handle, and the portion of the electrode wire 30 located inside the first insulating tube 400 is also fitted with the second insulating tube 500. The reinforcing tube 200 is made of metal, is fitted outside the first insulating tube 400, and is fixed to the insulating base 10. The handle is electrically connected to the electrode wire 30 and the electrode plate 20.

[0080] For details, please refer to Figure 3 As shown, the electrode wire 30 is U-shaped, with one fixed section 32 inserted into the insulating base 10 and the other fixed section 32 passing through the insulating base 10 and the first insulating tube 400 until it is electrically connected to the handle; more specifically, the two electrode wires 30 are connected together by a crimping tube and can be crimped or welded to the cable, and a second insulating tube 500 is then sleeved on the outer layer for insulation and barrier.

[0081] In addition, the reinforcing tube 200 is used to stably connect the electrode structure to the handle and form an AC circuit; preferably, the reinforcing tube 200 is a stainless steel tube, which not only reinforces the insulating base 10 but is also not prone to corrosion and can better control the creepage distance.

[0082] In some embodiments, the first insulating tube 400 and the second insulating tube 500 are made of polymer materials with high insulation properties. The second insulating tube 500 is used to block the tungsten wire, and the first insulating tube 400 blocks any accidental connection that may exist between the inner wall of the reinforcing tube 200 and the active electrode. Double insulation is achieved through the cooperation of the first insulating tube 400 and the second insulating tube 500.

[0083] In some embodiments, the first insulating tube 400 is further covered with a layer of FEP (perfluoroethylene propylene) heat shrink tubing 600.

[0084] The technical features of the above 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.

[0085] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. An electrode structure, characterized in that, include Insulating base (10); The electrode sheet (20) abuts against the top surface of the insulating base (10) and has a suction hole (21) and a limiting groove (22) through it along the axial direction. The limiting groove (22) opens outward in the radial direction and forms a sharp angle between the inner wall of the limiting groove (22) and the outer peripheral surface of the electrode sheet (20). And the electrode wire (30), with both ends passing through the limiting groove (22) along the axial direction to be fixed to the insulating seat (10), so as to limit the electrode sheet (20) between itself and the insulating seat (10).

2. The electrode structure according to claim 1, characterized in that, The electrode structure includes two electrode wires (30), and four limiting grooves (22) are equally spaced along the circumference on the electrode sheet (20). The two ends of each electrode wire (30) correspond to and pass through two different limiting grooves (22).

3. The electrode structure according to claim 2, characterized in that, Each of the electrode wires (30) includes an ablation section (31) and a fixing section (32) located at both ends of the ablation section (31). The ablation section (31) is located on the side of the electrode sheet (20) away from the insulating seat (10). The fixing section (32) passes through the limiting groove (22) axially to be fixed to the insulating seat (10). The ablation segments (31) of the two electrode wires (30) are parallel or intersecting along the axial direction.

4. The electrode structure according to claim 3, characterized in that, At least one of the ablation segments (31) is projected axially through the suction hole (21).

5. The electrode structure according to claim 4, characterized in that, At least one of the ablation segments (31) is bent and the projection of the bend angle along the axial direction is located within the suction hole (21).

6. The electrode structure according to claim 1, characterized in that, Each of the limiting grooves (22) is distributed around the suction hole (21) in the circumferential direction. The inner wall of the suction hole (21) includes a plurality of first sidewalls (211) that correspond one-to-one with each of the limiting grooves (22). Each first sidewall (211) corresponds to the inner wall of the corresponding limiting groove (22) in a contour. At least one sharp corner is provided between two adjacent first sidewalls (211).

7. The electrode structure according to claim 6, characterized in that, The inner wall of the suction hole (21) also includes a second sidewall (212), and two adjacent first sidewalls (211) are connected by the second sidewall (212), forming a sharp angle between the first sidewall (211) and the second sidewall (212).

8. The electrode structure according to claim 1, characterized in that, The insulating base (10) includes a base (11) and a plurality of protrusions (12) protruding from the top surface of the base (11). The electrode plate (20) abuts against the top surface of each of the protrusions (12) to form a lateral absorption port (13) between the electrode plate (20) and the base (11) that communicates inward with the suction hole (21) and outward with the outside.

9. The electrode structure according to claim 8, characterized in that, The projection of the limiting groove (22) along the axial direction is located inside the protrusion (12), and the electrode wire (30) passes through the limiting groove (22) into the protrusion (12).

10. A radiofrequency ablation tip, characterized in that, It includes a reinforcing tube (200), a suction passage pipe (300), a first insulating tube (400), a second insulating tube (500), a handle, and an electrode structure as described in any one of claims 1 to 9. The insulating base (10) has a through hole corresponding to the suction hole (21) through it along the axial direction. One end of the first insulating tube (400) is connected to the insulating base (10), and the other end is connected to the handle; The suction passage (300) is located inside the first insulating tube (400), with one end connected to the through hole and the other end extending into the handle; One end of the electrode wire (30) passes through the insulating base (10), the first insulating tube (400) and into the handle, and the portion of the electrode wire (30) located inside the first insulating tube (400) is also fitted with the second insulating tube (500). The reinforcing tube (200) is made of metal, is sleeved on the outside of the first insulating tube (400) and fixed to the insulating seat (10); The handle is electrically connected to the electrode wire (30) and the electrode sheet (20).

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