Ablation electrode

Abstract

The invention relates to the technical field of medical instruments, and particularly discloses an ablation electrode which comprises a needle tube, an ablation mechanism and a driving mechanism, the ablation mechanism is connected to the far end of the needle tube and provided with a plurality of ablation ends capable of moving in the radial direction of the needle tube, electrode plates are arranged at the ablation ends, and the electrode plates are evenly distributed in the circumferential direction of the needle tube at intervals; the driving mechanism drives the ablation mechanism to be switched between an opening state and a closing state, and in the opening state, the electrode slices protrude outwards to form an annular ablation area. The electrode plates are annularly distributed after being expanded, the attaching distance between the electrode plates and the blood vessel wall can be flexibly adjusted according to the inner diameter of the renal artery, the problem that non-coplanar electrode plates cannot adapt to blood vessels with different tube diameters is solved, meanwhile, the annularly distributed electrode plates can form complete energy coverage on the same radial section, ablation gaps are avoided, and the ablation efficiency is improved. Therefore, the sympathetic nerve fiber is comprehensively blocked, and the long-term effectiveness of blood pressure control is improved.

Description

Technical Field

[0001] This application relates to the field of medical device technology, and in particular to an ablation electrode. Background Technology

[0002] Hypertension, a prevalent chronic cardiovascular disease worldwide, has become a major risk factor for serious complications such as stroke, myocardial infarction, and renal failure, posing a significant threat to human health. For patients with refractory hypertension who do not respond well to drug treatment or cannot tolerate multiple antihypertensive drugs, renal artery sympathetic nerve ablation has gradually become an important minimally invasive treatment method. Its core principle is to release energy (such as radiofrequency or ultrasound) through an ablation needle to selectively destroy the sympathetic nerve fibers on the renal artery wall, blocking the blood pressure regulation disorder caused by excessive sympathetic nerve excitation, thereby achieving long-term stable blood pressure reduction.

[0003] The renal artery ablation needle is a key instrument in renal artery sympathetic nerve ablation, and its electrode design directly determines the efficiency of ablation energy distribution and the effectiveness of nerve blockade. Currently, most ablation needles use spiral electrodes, with a retractable spiral electrode ring to expand the coverage area. However, because the electrodes are non-coplanarly distributed along the spiral trajectory, it is difficult to form a continuous circular ablation zone, resulting in some sympathetic nerve fibers not being effectively destroyed. This makes postoperative nerve conduction function more likely to recover, thus affecting the long-term effectiveness of blood pressure control. Summary of the Invention

[0004] To address the aforementioned problems, this application provides an ablation electrode.

[0005] To achieve the above objectives, this application adopts the following technical solution: According to one aspect of this application, an ablation electrode is provided, comprising: syringe; An ablation mechanism is connected to the distal end of the needle tube. The ablation mechanism has multiple ablation ends that can move radially along the needle tube. Each ablation end is provided with an electrode plate, and the electrode plates are evenly spaced apart in the circumferential direction of the needle tube. A driving mechanism is disposed on the needle tube. The driving mechanism drives the ablation mechanism to switch between an open state and a closed state. In the open state, each electrode sheet protrudes outward to form an annular ablation area.

[0006] In one embodiment, the ablation mechanism includes a plurality of ablation lines, each of the ablation lines constituting an ablation end, or each of the ablation lines is provided with at least one ablation end.

[0007] In one embodiment, the ablation conduit includes a first arm tube, an intermediate arm tube, and a second arm tube connected in sequence, and the electrode pad is disposed on the intermediate arm tube; When the ablation mechanism is in its retracted state, the first arm tube, the intermediate arm tube, and the second arm tube are all long tubular shapes. When switching from the retracted state to the extended state, the first arm tube and the second arm tube undergo bending deformation, thereby driving the intermediate arm tube on which the electrode plate is disposed to move outward at least radially along the needle tube.

[0008] In one embodiment, a needle is also included, the ablation mechanism is connected to the needle and the needle tube, and the drive mechanism is connected to the needle to switch the state of the ablation mechanism by driving the movement of the needle.

[0009] In one embodiment, the driving mechanism includes a pulling member movably disposed within the needle tube and connected to the needle tip. The distance between the needle tip and the needle tube is adjusted by the movement of the pulling member to move the ablation tubing.

[0010] In one embodiment, a handle is further included, with one end of the needle away from the ablation mechanism disposed on the handle. The drive mechanism further includes a moving component disposed on the handle, the moving component comprising: Rotary teeth are rotatably mounted on the handle, and the rotary teeth at least partially protrude from the handle; A connecting seat is movably disposed within the handle along the axial direction of the needle tube. The first end of the connecting seat passes through the middle of the rotating tooth and is threadedly engaged with the rotating tooth. The end of the pulling member away from the needle tip is connected to the connecting seat.

[0011] In one embodiment, an elastic buffer mechanism is also included, which is disposed in the transmission path of the drive mechanism and configured such that when the electrode pad is attached to the blood vessel wall, continued operation of the drive mechanism can cause additional deformation of the elastic buffer mechanism, while the displacement of the pulling member remains substantially unchanged.

[0012] In one embodiment, a status indication mechanism is also included, which is linked to the elastic buffer mechanism and configured to provide a visual indication that the electrode pad has formed an effective contact with the blood vessel wall in response to the additional deformation of the elastic buffer mechanism.

[0013] In one embodiment, the needle tube has a fluid flow channel through which physiological saline flows, the ablation tubing has a tubing channel that communicates with the fluid flow channel, and the electrode plate has multiple through holes that communicate with the corresponding tubing channels.

[0014] In one embodiment, at least two pull members are provided, the needle tube has an inner wall surface and an outer wall surface, the inner wall surface surrounds to form the liquid flow channel, and the space between the inner wall surface and the outer wall surface is a wall portion. Each of the pull members is symmetrically arranged inside the needle tube and passes through the wall portion of the needle tube.

[0015] According to the ablation electrode provided in this application embodiment, each electrode sheet protrudes outward in an extended state to form a ring-shaped ablation area, and the movement path of the electrode sheet is defined, so that the electrode sheet can flexibly adjust the contact distance with the blood vessel wall according to the inner diameter of the renal artery. This solves the problem that existing non-coplanar electrode sheets cannot adapt to blood vessels of different diameters. At the same time, the ring-shaped electrode sheets can form a complete energy coverage in the same radial cross section, avoiding the generation of ablation gaps, thereby ensuring that the sympathetic nerve fibers are completely blocked and improving the long-term effectiveness of blood pressure control. Attached Figure Description

[0016] Figure 1 This illustration shows a schematic diagram of the structure of an ablation electrode provided in an embodiment of this application; Figure 2 Show Figure 1 Exploded view; Figure 3 Show Figure 1 The main view; Figure 4 Show Figure 3 Enlarged view of section B; Figure 5 Show Figure 3 Sectional view along the AA direction; Figure 6 This illustration shows a schematic diagram of the ablation mechanism in an ablation electrode according to an embodiment of this application. Figure 7 This illustration shows a schematic diagram of the ablation mechanism in an ablation electrode according to another embodiment of this application; Figure 8 This illustration shows a schematic diagram of the ablation conduit in an ablation electrode according to an embodiment of this application; Figure 9 This illustration shows a structural schematic diagram of a conversion element in an ablation electrode according to an embodiment of this application; Figure 10 This image shows a perspective view of a conversion element in an ablation electrode according to an embodiment of this application; Figure 11 This illustration shows a schematic diagram of the needle tube in an ablation electrode provided in an embodiment of this application; Figure 12 This illustration shows a schematic diagram of the handle in an ablation electrode according to an embodiment of this application; Figure 13This diagram illustrates the structure of a driving mechanism in an ablation electrode according to an embodiment of this application. Figure 14 This illustration shows a structural schematic diagram of a moving component in an ablation electrode according to an embodiment of this application; Figure 15 Show Figure 14 The main view; Figure 16 Show Figure 15 A cross-sectional view along the CC direction; Figure 17 An exploded view of a moving component in an ablation electrode provided in an embodiment of this application is shown.

[0017] Explanation of reference numerals in the attached figures: 1. Syringe; 11. Fluid flow channel; 12. Inner wall surface; 13. Outer wall surface; 14. Wall portion; 2. Ablation mechanism; 21. Electrode plate; 22. Through hole; 23. Ablation tubing; 231. First arm tube; 232. Intermediate arm tube; 233. Second arm tube; 24. Tubing channel; 25. Conversion component; 3. Drive mechanism; 31. Pulling component; 32. Moving part; 321. Rotating gear; 322. Connecting seat; 4. Needle; 5. Handle; 51. Operating arc; 52. Operating hole; 6. Visual panel; 7. Elastic buffer mechanism; 71. First pull seat; 711. Seat body; 712. Baffle; 72. Second pull seat; 721. Receiving groove; 73. Elastic element; 74. Connecting element; 75. Blocking seat; 8. Status indicator mechanism; 81. Clearance hole; 82. Observation hole. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0019] It should be noted that the illustrations provided in this embodiment are only schematic representations of the basic concept of this application. Therefore, the drawings only show the components related to this application and are not drawn according to the number, shape and size of the components in actual implementation. In actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0020] The structures, proportions, sizes, etc., shown in the accompanying drawings of this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed in the specification, and are not intended to limit the implementation conditions of this application. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size should still fall within the scope of the technical content disclosed in this application, provided that they do not affect the effects and purposes that this application can produce.

[0021] The orientations or positional relationships indicated by terms such as "upper," "lower," "left," "right," "middle," "longitudinal," "lateral," "horizontal," "inner," "outer," "radial," and "circumferential" used in this specification are based on the orientations or positional relationships shown in the accompanying drawings and are used only for the purpose of simplifying the description. They 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 limiting this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0022] like Figures 1-7 As shown, this embodiment provides an ablation electrode, including a needle tube 1, an ablation mechanism 2, and a driving mechanism 3. The ablation mechanism 2 is connected to the distal end of the needle tube 1 and has multiple ablation ends that can move radially along the needle tube 1. Each ablation end is provided with an electrode plate 21, and the electrode plates 21 are evenly spaced in the circumferential direction of the needle tube 1. The driving mechanism 3 is disposed on the needle tube 1 and drives the ablation mechanism 2 to switch between an open state and a closed state. In the open state, each electrode plate 21 protrudes outward to form an annular ablation area.

[0023] By forming an annular ablation area with each electrode pad 21 in an expanded state and limiting the movement path of the electrode pad 21, the electrode pad 21 can flexibly adjust its contact distance with the blood vessel wall according to the inner diameter of the renal artery. This solves the problem that existing non-coplanar electrode pads 21 cannot adapt to blood vessels of different diameters. At the same time, the annularly distributed electrode pads 21 can form a complete energy coverage in the same radial cross section, avoiding the generation of ablation gaps, thereby ensuring that sympathetic nerve fibers are completely blocked and improving the long-term effectiveness of blood pressure control.

[0024] The ablation ends are provided in multiple ways, preferably three to six. The uniform spacing of the multiple ablation ends can further ensure that the ring energy coverage formed by the electrode sheet 21 is seamless. The electrode sheet 21 is made of a biocompatible conductive material, which not only ensures energy conduction efficiency but also avoids triggering human immune response, thereby further improving the safety of treatment.

[0025] Combination Figure 8In some embodiments, the ablation mechanism 2 includes a plurality of ablation conduits 23, each of the ablation conduits 23 constituting an ablation end. The ablation conduit 23, as an integral unit, moves at least radially when the ablation mechanism 2 switches states. Its drive is direct and stable, ensuring that a stable and reliable electrical contact is formed between the electrode pad 21 and the blood vessel wall.

[0026] Alternatively, each ablation conduit 23 may be provided with at least one ablation end. When the ablation mechanism 2 switches states, the outward protrusion of the ablation end on the ablation conduit 23 can drive the movement of the electrode plate 21 located thereon to form an annular ablation area. When there are two or more ablation ends on the ablation conduit 23, the ablation efficiency can be improved compared to having only one ablation end. Alternatively, when the ablation mechanism 2 switches states, the ablation conduit 23 as a whole deforms, causing the ablation end to protrude outward, thereby driving the movement of the electrode plate 21 located thereon to form an annular ablation area.

[0027] Optionally, the ablation conduit 23 includes a first arm tube 231, an intermediate arm tube 232 and a second arm tube 233 connected in sequence, and the electrode plate 21 is disposed on the intermediate arm tube 232.

[0028] In the retracted state, the first arm tube 231, the intermediate arm tube 232, and the second arm tube 233 of the ablation mechanism 2 are all elongated tubular shapes, including straight tubes, spiral tubes, corrugated tubes, or variable-diameter tubes, etc. When switching from the retracted state to the extended state, the first arm tube 231 and the second arm tube 233 undergo bending deformation, thereby driving the intermediate arm tube 232, on which the electrode plate 21 is provided, to move outward at least radially along the needle tube 1. The outward convex directions of each ablation channel 23 are different, thus forming a cage-like structure in the extended state of the ablation mechanism 2 to ensure the ablation effect.

[0029] By setting the ablation conduit 23 as a long tube, the overall outer diameter of the ablation mechanism 2 is small when it is in the retracted state, which facilitates the smooth insertion of the needle 1 into the renal artery without damaging the vascular intima. The bending deformation of the first arm tube 231 and the second arm tube 233 allows the two to work together to drive the intermediate arm tube 232 to move smoothly radially. Compared with a rigid telescopic structure, this flexible deformation can adapt to the complex environment inside the blood vessel and avoid causing hard impact to the blood vessel wall. At the same time, the intermediate arm tube 232, as the ablation end, ensures that the electrode pad 21 always maintains a stable posture as it moves with the intermediate arm tube 232. This ensures that each electrode pad 21 remains in the same radial section during the expansion process, achieving coplanar ablation and solving the problem of dispersed energy distribution of existing axial or spirally arranged electrodes.

[0030] In other words, in the expanded state, all the ablation ends are located in the same tangential plane, which is a plane perpendicular to the axis of the needle tube 1. Since the renal artery sympathetic nerve is not a single nerve bundle, but rather a neural network that surrounds the adventitia of the renal artery, by setting multiple ablation ends and placing them in the expanded state in the same tangential plane perpendicular to the axis of the needle tube 1, in the expanded state of the ablation mechanism 2, each electrode 21 on the multiple ablation ends can simultaneously contact multiple points in the circumferential direction of the blood vessel wall to form a ring-shaped area. This allows a single energy release to form a continuous, ring-shaped ablation zone, ensuring that the sympathetic nerve fibers on this section are ablated synchronously, greatly reducing the possibility of hypertension recurrence due to missed nerves.

[0031] It is understood that during the switching between the retracted and expanded states of the ablation mechanism 2, the ablation end moves at least in the radial direction of the needle tube 1. This includes the ablation end moving only in the radial direction of the needle tube 1, or moving in both the radial and axial directions of the needle tube 1, or moving in the radial, axial, and circumferential directions of the needle tube 1. Preferably, the ablation end moves synchronously in the axial and radial directions of the needle tube 1, which allows for better control of the ablation area of ​​the electrode pad 21. After completing the ablation work in one area, the position of the electrode pad 21 in the blood vessel can be changed by moving the handle 5, thereby performing the ablation work in the next area.

[0032] Reference Figure 7 In some embodiments, the ablation electrode further includes a needle 4. The ablation mechanism 2 connects the needle 4 and the needle tube 1. The end of the first arm tube 231 away from the intermediate arm tube 232 is connected to the needle 4. The driving mechanism 3 is connected to the needle 4 and switches the state of the ablation mechanism 2 by driving the movement of the needle 4. Controlling the state of the ablation mechanism 2 by driving the movement of the needle 4 reduces the direct force on the electrode pads 21 and the ablation ends compared to directly driving the ablation conduit 23, preventing the electrode pads 21 from falling off or being damaged due to excessive local force. At the same time, the axial movement of the needle 4 can achieve synchronous opening or closing of each ablation end through the linkage of the first arm tube 231 and the second arm tube 233, ensuring the consistency of movement of multiple electrode pads 21, thereby ensuring uniform contact pressure between each electrode pad 21 and the blood vessel wall, avoiding energy concentration or coverage omissions caused by the displacement of a single electrode pad 21, and improving the stability of the ablation effect.

[0033] like Figures 1-11As shown, in some embodiments, the needle tube 1 has a fluid flow channel 11, and the proximal end of the needle tube 1 is provided with an inlet connected to the fluid flow channel 11. The inlet is used to deliver physiological saline into the fluid flow channel 11. The ablation tubing 23 has a tubing channel 24, which communicates with the fluid flow channel 11. The electrode plate 21 has multiple through holes 22, which communicate with the corresponding tubing channels 24. By setting up an independent ablation tubing 23 and opening tubing channels 24, physiological saline can be stably delivered to the ablation end. At the same time, this split design not only simplifies the structure of the fluid flow channel 11, but also facilitates the independent manufacturing and maintenance of the ablation mechanism 2, improving the modularity and maintainability of the device.

[0034] By incorporating a fluid flow channel 11 within the needle tube 1 and circulating physiological saline, the saline can uniformly seep from the surface of the electrode pad 21 into the ablation area. This effectively reduces the risk of tissue carbonization during ablation, while simultaneously improving ablation efficiency and ensuring the uniformity and controllability of the ablation effect. Furthermore, the saline continuously moistens the interface between the electrode pad 21 and the tissue during ablation, effectively preventing tissue adhesion and electrode pad contamination, increasing instrument durability, and enhancing surgical safety. It also ensures sufficient contact between the electrode pad 21 and the tissue, thereby improving the transmission efficiency of radiofrequency energy and reducing tissue damage caused by local overheating.

[0035] The ablation end is moved radially by the drive mechanism 3, ensuring reliable contact between the electrode pad 21 on the ablation end and the blood vessel wall. Because the renal arteries are distributed in a network, the ablation conduit 23 deforms during state switching of the ablation mechanism 2, causing the ablation end to bulge outwards, thus moving the electrode pad 21 to form a ring-shaped ablation area. This effectively prevents the electrode pad 21 from contacting the center of the network, which could lead to insufficient ablation energy and ineffective treatment. The movement of the electrode pad 21 allows for adjustment of the ablation range, enhancing the adaptability and operational flexibility of the ablation needle, ensuring precise coverage of the target nerve area, and improving the success rate and treatment effect.

[0036] Physiological saline is an excellent conductive medium. After injection, it can increase the conductivity of local tissue, helping to deliver radiofrequency current more evenly to the target area and reducing energy loss due to tissue drying or carbonization. Saline perfusion electrodes can continuously moisten the tissue surface, reducing impedance rise and ensuring more controllable ablation depth and range.

[0037] Meanwhile, the heat generated by radiofrequency current may cause excessively high local tissue temperatures, leading to carbonization and even the risk of thrombosis. Injecting saline solution can reduce the risk of damage to surrounding healthy tissues due to high temperatures by dissipating heat locally, while also preventing the formation of a carbonized layer on the surface of the ablation area due to excessive drying. It is known that a carbonized layer can hinder the conduction of heat to deeper tissues, affecting the ablation effect.

[0038] Furthermore, saline solution can form a liquid isolation zone, reducing the risk of heat diffusion to non-target areas through physical separation and heat absorption buffering, thus minimizing complications and providing isolation and protection for vital organs. After saline injection, the hypertonic environment can alter local tissue osmotic pressure, expanding the ablation range and allowing heat to diffuse more evenly, thereby improving lesion clearance rates.

[0039] In summary, saline solution can enter the tubing channel 24 through the fluid flow channel 11, and then flow out through the through hole 22 of the electrode pad 21 to the contact area between the electrode pad 21 and the blood vessel wall. On the one hand, the saline solution can absorb the excess heat released by the electrode pad 21, avoiding excessive damage to the vascular endothelium caused by excessive local temperature, and reducing the risk of renal artery stenosis and thrombosis. On the other hand, the flowing saline solution can flush the surface of the electrode pad 21, preventing blood components from coagulating on the electrode pad 21 to form thrombi, ensuring the energy conduction efficiency of the electrode pad 21. At the same time, the wetting effect of the saline solution can also reduce the contact resistance between the electrode pad 21 and the blood vessel wall, so that the radiofrequency energy can be transmitted to the sympathetic nerve fibers more efficiently, improving the energy utilization efficiency.

[0040] Combination Figure 7 and Figure 8 Furthermore, the via 22 on the electrode 21 is located on the side of the electrode 21 away from the central axis of the needle tube 1. The side of the electrode 21 away from the central axis of the needle tube 1 is the direct contact area between the electrode 21 and the blood vessel wall. By setting the via 22 here, physiological saline can be directly sprayed onto the contact interface, maximizing the cooling and flushing effects. Compared with the via being located on the side of the electrode 21 facing the central axis of the needle tube 1, this avoids the physiological saline flowing into the blood first, which would reduce the cooling efficiency. At the same time, the physiological saline directly acting on the contact interface can form a liquid film, which reduces frictional damage between the electrode 21 and the blood vessel wall, and the energy distribution is more uniform through the conduction of the liquid film, further improving the safety and effectiveness of ablation.

[0041] Combination Figure 11The electrode 21 is connected to a wire that provides power to it. One end of the wire is connected to the electrode 21, and the other end passes through the tubing channel 24 and the fluid flow channel 11 to extend out to the handle 5 for connection to the main unit, ensuring a stable power supply. Alternatively, one end of the wire can be connected to the electrode 21, and the other end can be attached to the outer wall of the ablation tubing 23 and the outer wall 13 of the needle tube 1, extending to the other end of the needle tube 1, and then connected to the main unit to ensure a stable power supply.

[0042] like Figures 1-11 As shown, in some embodiments, the end of the needle tube 1 is provided with a conversion element 25. One end of the conversion element 25 is connected to the fluid flow channel 11, and the other end of the conversion element 25 is connected to each of the ablation channels 23. Each ablation channel 23 is provided with an electrode plate 21 at its ablation end. By providing multiple electrode plates 21, multiple ablation areas can be formed during ablation, thereby covering the neural network as large an area as possible and ensuring the ablation effect. In addition, compared with single-point ablation, it can improve ablation efficiency, shorten operation time, reduce operation steps, and reduce the risk of mechanical damage to the vascular wall caused by repeated instrument movements.

[0043] The conversion element 25 allows saline solution located in the fluid channel 11 to flow simultaneously to multiple ablation lines 23, which can stably deliver saline solution to the ablation area of ​​each electrode 21 at the same time, ensuring the ablation effect.

[0044] In addition, the conversion element 25 can provide a pressure balance buffer for the saline solution flowing into each ablation line 23. After initial equalization is achieved here, it enters each ablation line 23 synchronously, which greatly reduces the pressure loss difference caused by the asymmetry of the flow path and ensures that the pressure and flow rate of the saline solution at each electrode 21 are basically the same, thus ensuring a uniform and stable ablation effect.

[0045] Because the overall length of the needle tube 1 is relatively long, by placing the conversion element 25 at the end of the needle tube 1, it can be ensured that the saline solution reaches the conversion element 25 at the highest possible pressure before being delivered to it. Afterwards, the saline solution is diverted through the conversion element 25 to each ablation tubing 23, thereby minimizing pressure loss along the route and locally, and ensuring pumping pressure.

[0046] The conversion component 25 is connected to the needle tube 1 by bonding, welding, or integral molding. By employing bonding, welding, or integral molding, a secure connection and seal between the conversion component 25 and the needle tube 1 are ensured, preventing leakage of saline solution during delivery. In this embodiment, the conversion component 25 and the needle tube 1 are fixedly connected by bonding.

[0047] The conversion component 25 is connected to the ablation tubing 23 by adhesive bonding or welding. Connecting the conversion component 25 and the ablation tubing 23 by adhesive bonding or welding ensures the sealing and mechanical strength of the connection, preventing leakage of saline solution during delivery. In this embodiment, the conversion component 25 and the ablation tubing 23 are fixedly connected by adhesive bonding.

[0048] like Figures 1-4 As shown, in some embodiments, the driving mechanism 3 includes a pulling member 31, which is movably disposed within the needle tube 1 and connected to the needle tip 4. The movement of the pulling member 31 adjusts the distance between the needle tip 4 and the needle tube 1, thereby causing the ablation conduit 23 to move. Adjusting the relative distance between the needle tip 4 and the needle tube 1 directly controls the movement of the ablation end, achieving control over the displacement of the ablation end. This enhances the intuitiveness and response speed of the operation, facilitating adjustments to the ablation position based on actual conditions. It also ensures the accuracy and repeatability of the ablation end displacement, making the ablation range controllable and improving the precision and safety of the surgery.

[0049] The pulling member 31 can be a pull rod or a pull rope or metal wire with a certain degree of rigidity. In this embodiment, the pulling member 31 is made of metal wire, which can ensure that the pulling member 31 occupies a small space in the ablation electrode, and at the same time ensure that it can stably pull the needle 4 to move after being subjected to force, thereby ensuring the stable deformation of the ablation mechanism 2.

[0050] Combination Figure 13 Of course, the movement of the pulling member 31 can be driven manually or mechanically. That is, the pulling member 31 can be moved by manually pulling it, thereby realizing the relative movement of the needle 4. Alternatively, the needle tube 1 is provided with a moving member 32, the movable end of the moving member 32 reciprocates along the axial direction of the needle tube 1, and the end of the pulling member 31 away from the needle 4 is connected to the movable end of the moving member 32; therefore, the reciprocating movement of the movable end of the moving member 32 drives the reciprocating movement of the needle 4, thereby realizing the movement of the ablation end.

[0051] The moving component 32 includes a structure that combines a cylinder, an electric push rod, a motor, and a lead screw.

[0052] Furthermore, a single pull member 31 can be provided, with one end of the pull member 31 connected to the middle of the needle 4 and the other end of the pull member 31 passing through the middle of the needle tube 1, thereby ensuring a stable supply of force for the state switching of the ablation mechanism 2.

[0053] Of course, at least two pulling members 31 can be provided, with each pulling member 31 evenly spaced apart, which enhances the stability of the ablation end movement and prevents deviation or jamming that may occur with single-point drive. In this embodiment, two pulling members 31 are provided, and the two pulling members 31 are symmetrically distributed.

[0054] Combination Figure 11 Furthermore, the needle tube 1 has an inner wall surface 12 and an outer wall surface 13. The inner wall surface 12 encloses and forms the fluid flow channel 11. The space between the inner wall surface 12 and the outer wall surface 13 is a wall portion 14. Each of the pulling members 31 passes through the wall portion 14 of the needle tube 1. By passing each pulling member 31 through the wall portion 14 of the needle tube 1, the space of the wall portion 14 of the needle tube 1 is effectively utilized, interference with the fluid flow channel 11 is avoided, and the stable delivery of physiological saline is ensured. At the same time, a compact layout of the drive mechanism 3 is achieved, improving the overall integrity and operational reliability of the device.

[0055] This ensures that the tension on the needle 4 is balanced, preventing the needle 4 from deviating during movement, thus ensuring that the opening angle of each ablation end is consistent, and ensuring that the circumferential spacing of the electrode pads 21 is uniform, forming a regular annular energy coverage area. Compared with a single pulling member 31, it can effectively prevent uneven contact between the electrode pads 21 and the blood vessel wall caused by the deviation of the needle 4. At the same time, the pulling member 31 is inserted into the wall 14 of the needle tube 1, which can avoid occupying the internal space of the fluid flow channel 11, ensuring smooth flow of physiological saline, without affecting the cooling and flushing functions, and achieving non-interference between power transmission and fluid delivery.

[0056] In some embodiments, the needle 1 is further provided with a delivery pump, which is connected to the fluid flow channel 11 and is used to pump the saline solution into the fluid flow channel 11. The delivery pump enables active pumping of the saline solution, allowing control of the flow rate and pressure, ensuring a continuous and stable supply of saline solution during the ablation process, and avoiding decreased ablation effectiveness or tissue damage due to insufficient flow.

[0057] Furthermore, the movement of the ablation tubing 23 is driven by the drive mechanism 3, thereby ensuring the reliability of the ablation end position. During the pumping of saline solution within the ablation tubing 23, the overall shape of the tubing remains unchanged as the saline solution fills, ensuring stable saline delivery and maintaining a fixed contact point between the electrode pads 21 and the blood vessel wall. This allows each ablation to precisely target the planned nerve point, eliminating treatment errors caused by instrument deformation, significantly improving the predictability and success rate of the procedure, and avoiding treatment ineffectiveness or accidental damage to non-target tissues due to positional deviation. Simultaneously, the geometry of the ablation tubing 23 is maintained, ensuring stable and consistent fluid resistance to each electrode pad 21. This guarantees uniform saline solution flow from all orifices 22, achieving balanced cooling of all electrode pads 21, ultimately resulting in uniform heat distribution during ablation. This prevents localized overheating and carbonization or insufficient cooling, improving the safety and consistency of treatment outcomes.

[0058] Optionally, the proximal end of the needle tube 1 is provided with a liquid inlet, and a liquid inlet channel is provided through the liquid inlet. The axial direction of the liquid inlet channel is set at an angle to the axial direction of the liquid flow channel 11. The liquid outlet end of the liquid inlet channel is connected to the liquid inlet of the liquid flow channel 11. The delivery pump is used to pump the physiological saline through the liquid inlet end of the liquid inlet channel into the liquid flow channel 11, thereby ensuring the stable delivery of physiological saline and avoiding interference with the drive mechanism 3.

[0059] Furthermore, one end of the fluid flow channel 11 inside the needle tube 1 is connected to the tubing channel 24 of the ablation tubing 23, while the other end of the fluid flow channel 11 inside the needle tube 1 is blocked. This can prevent the saline delivery path from becoming unstable and unreliable, and prevent saline leakage.

[0060] like Figures 1-13 As shown, in some embodiments, the ablation electrode further includes a handle 5, with one end of the needle tube 1 away from the ablation mechanism 2 disposed on the handle 5. The drive mechanism 3 further includes a moving component 32 disposed on the handle 5, the moving component 32 including a rotating tooth 321 and a connecting seat 322. The rotating tooth 321 is rotatably disposed on the handle 5, and at least partially protrudes from the handle 5. The connecting seat 322 is movably disposed within the handle 5 along the axial direction of the needle tube 1, with its first end penetrating the middle of the rotating tooth 321 and threadedly engaging with it. The end of the pulling member 31 away from the needle tip 4 is connected to the connecting seat 322.

[0061] Combination Figure 14A connecting seat 322 with a threaded engagement is provided on the handle 5. By rotating the rotating tooth 321 protruding from the handle 5, the connecting seat 322 is driven to move axially by the threaded transmission. The threaded transmission has the characteristics of controllable stroke and good self-locking, which can realize the fine adjustment of the opening amplitude of the ablation mechanism 2 to meet the adaptation needs of different blood vessel diameters. At the same time, the fixed connection between the connecting seat 322 and the pulling member 31 can convert the rotational motion of the rotating tooth 321 into the axial linear motion of the pulling member 31, ensuring the smoothness of power transmission, avoiding the pulling member 31 from being subjected to excessive instantaneous force, protecting the deformation structure of the ablation tubing 23 from damage, and thus increasing the durability of the device.

[0062] The handle 5 has an inwardly recessed operating arc 51, and an operating hole 52 is provided through the middle of the inwardly recessed arc. The rotating tooth 321 is rotatably disposed inside the handle 5, and at least part of it is located inside the operating hole 52, protruding from the handle 5. The operator's fingers provide driving force by rotating the protruding rotating tooth 321. The operating arc 51 is designed to facilitate finger placement and operation.

[0063] Reference Figure 1 , Figure 2 as well as Figures 12-17 As shown, in some embodiments, the ablation electrode further includes an elastic buffer mechanism 7 and a status indication mechanism 8. The elastic buffer mechanism 7 is disposed in the transmission path of the drive mechanism 3 and configured such that when the electrode pad 21 is in contact with the blood vessel wall, continued operation of the drive mechanism 3 can cause additional deformation of the elastic buffer mechanism 7, while the displacement of the pulling member 31 remains substantially unchanged. The status indication mechanism 8 is linked to the elastic buffer mechanism 7 and is configured to provide a visual indication that the electrode pad 21 has formed effective contact with the blood vessel wall in response to the additional deformation of the elastic buffer mechanism 7.

[0064] When the ablation mechanism 2 is extended to the point where the electrode pad 21 is in contact with the blood vessel wall, the position of the pulling member 31 remains unchanged. The continued movement of the driving mechanism 3 will cause the elastic buffer mechanism 7 to undergo additional deformation, and a visual indication will be displayed through the status indicator mechanism 8. This allows for a direct visual judgment that the electrode pad 21 has formed an effective contact with the blood vessel wall. At the same time, the buffering effect of the elastic buffer mechanism 7 can automatically adjust the contact pressure of each electrode pad 21. Even if there is a slight irregularity in the shape of the blood vessel wall, pressure compensation can be achieved through elastic deformation, ensuring the contact stability between each electrode pad 21 and the blood vessel wall, thereby ensuring the uniformity of energy distribution.

[0065] Among them, the elastic buffer mechanism 7 includes a tension spring buffer mechanism, a compression spring buffer mechanism, or an elastic block mechanism, etc. The elastic block mechanism includes an elastic block, which is set in the transmission path of the drive mechanism 3. The energy is transmitted through the shearing or compression deformation of the elastic block. When the resistance increases after the electrode 21 is attached to the blood vessel wall, the elastic block undergoes greater deformation to absorb energy.

[0066] In this embodiment, the elastic buffer mechanism 7 adopts a tension spring type buffer mechanism. The elastic buffer mechanism 7 includes a first pull seat 71, a second pull seat 72, an elastic element 73, and a blocking seat 75. The first pull seat 71 and the second pull seat 72 are both movably disposed within the connecting seat 322. The other end of the pull element 31 passes through the connecting seat 322 and is connected to the first pull seat 71. The elastic element 73 connects the first pull seat 71 and the second pull seat 72 and is in a pre-stretched state. The blocking seat 75 is movably disposed at the end of the connecting seat 322 away from the needle tube 1 and is connected to the second pull seat 72 through the connecting element 74.

[0067] The rotation of the rotating tooth 321 drives the reciprocating movement of the connecting seat 322. When the rotating tooth 321 rotates, the connecting seat 322 moves away from the needle 4, and the connecting seat 322 drives the synchronous movement of the blocking seat 75. Under the connection of the connecting member 74, the blocking seat 75 drives the movement of the second pulling seat 72, and in turn, through the elastic member 73 and the first pulling seat 71, it causes the pulling member 31 to move, thereby realizing the state switching of the ablation mechanism 2 from the retracted state to the expanded state.

[0068] By pre-stretching the elastic element 73, the second pull seat 72 can stably pull the first pull seat 71 to move, thus preventing the elastic element 73 from changing elastically and causing the first pull seat 71 to remain stationary.

[0069] Among them, the elastic element 73 includes a spring or torsion spring, and the connecting element 74 can be a pull rod or a pull rope or metal wire with a certain rigidity.

[0070] In addition, by connecting the first pull seat 71 and the second pull seat 72 through the elastic element 73, it can be ensured that the ablation mechanism 2 is always subjected to flexible buffering force during the opening process, so as to avoid rigid collision between the electrode sheet 21 and the blood vessel wall and reduce the risk of blood vessel damage.

[0071] It is known that the elastic buffer mechanism 7 can also adopt a compression spring type buffer mechanism. Its main structure is the same as that of the tension spring type buffer mechanism. The main difference is that the elastic element 73 is in a pre-compressed state, and the second pull seat 72 is located on the side of the first pull seat 71 facing the needle 4. Its working principle is the same as that of the tension spring type buffer mechanism, and will not be described in detail here.

[0072] In some embodiments, the status indicator mechanism 8 can be a pointer scale mechanism, which includes a scale on the handle 5 and a pointer linked to the elastic buffer mechanism 7. When the elastic buffer mechanism 7 deforms, it drives the pointer to move and point to different areas on the scale.

[0073] In this embodiment, the status indication mechanism 8 includes an observation hole 82 opened on the handle 5, and a portion of the elastic buffer mechanism 7 is located in the observation hole 82; under the additional deformation of the elastic buffer mechanism 7, the stretching amount of the elastic element 73 is greater than the stretching amount of the elastic element 73 in the pre-stretched state, and the portion of the elastic buffer mechanism 7 aligned with the observation hole 82 changes to form a visual indication.

[0074] When the ablation mechanism 2 is extended to the point where the electrode pad 21 is in contact with the blood vessel wall, the position of the pulling member 31 remains unchanged. The continued movement of the connecting seat 322 will drive the movement of the blocking seat 75, the connecting member 74, and the second pulling seat 72, thereby pulling the elastic member 73, so that the elastic member 73 is further stretched from the pre-stretched state. At this time, the second pulling seat 72 moves while the first pulling seat 71 remains unchanged. The positional change of the second pulling seat 72 can be directly observed through the observation hole 82. Thus, the working state of the elastic member 73 can be intuitively judged through the observation hole 82, ensuring that the electrode pad 21 has formed an effective contact with the blood vessel wall. At the same time, the buffering effect of the elastic member 73 can automatically adjust the contact pressure of each electrode pad 21. Even if there is a slight irregular shape in the blood vessel wall, pressure compensation can be achieved through elastic deformation, ensuring the contact stability between each electrode pad 21 and the blood vessel wall, thereby ensuring the uniformity of energy distribution.

[0075] Of course, when the connecting seat 322 blocks the part of the elastic buffer mechanism 7 that changes, the status indicator mechanism 8 may also include a clearance hole 81. The clearance hole 81 is opened on the connecting seat 322, thereby avoiding the blocking of the connecting seat 322 and ensuring stable observation of the observation hole 82.

[0076] In some embodiments, a warning sign is provided on the second pull seat 72, and under the additional deformation of the elastic buffer structure, the warning sign is positioned opposite the observation hole 82. By aligning the warning sign with the observation hole 82, the tensile state of the elastic element 73 can be converted into a visually perceptible signal.

[0077] At the same time, the precise alignment of warning signs can ensure consistent judgment, reduce individual differences caused by different doctors' operations, and make the ablation effect more stable.

[0078] The warning signs include color coding, scale patterns, or a combination of both. Color coding includes red, orange, yellow, or fluorescent markings; scale patterns include arrows or graduated lines. Color coding and scale patterns can also be spaced apart along the moving direction of the second pull seat 72 to achieve different levels of alertness through the exposure of different warning signs.

[0079] like Figures 13-17 As shown, in some embodiments, when the elastic element 73 is in a pre-stretched state, the relative positions of the first pull seat 71 and the second pull seat 72 are in a first state; under the additional deformation of the elastic buffer structure 7, the relative positions of the first pull seat 71 and the second pull seat 72 are in a second state, and can be observed through the observation hole 82. Visual cues are achieved by observing the relative position changes of the first pull seat 71 and the second pull seat 72 through the observation hole 82. That is, the observation hole 82 can be used to observe the relative position changes of the first pull seat 71, or the relative position changes of the second pull seat 72, etc., thereby achieving visual observation.

[0080] Furthermore, the first pull seat 71 includes a seat body 711 and a baffle 712. The opposite sides of the seat body 711 are respectively used to connect the pull member 31 and the elastic member 73. The baffle 712 is disposed on the seat body 711 and extends axially along the needle tube 1. When the elastic member 73 is in a pre-stretched state, the baffle 712 covers the warning sign. Under the additional deformation of the elastic buffer structure, the warning sign protrudes from the baffle 712 to align with the observation hole 82. The protrusion of the warning sign from the baffle 712 under the additional deformation provides a visual display, thus serving as an operation prompt.

[0081] Furthermore, the second pull seat 72 has a receiving groove 721 on the side facing the first pull seat 71. The receiving groove 721 extends along the moving direction of the second pull seat 72, and the elastic element 73 is disposed in the receiving groove 721. The receiving groove 721 can provide precise limiting guidance for the elastic element 73, avoiding lateral displacement or torsional deformation of the elastic element 73 during stretching or contraction, ensuring the axial force and deformation of the elastic element 73, thereby ensuring the stability of the pulling force direction of the elastic element 73 on the second pull seat 72, making the axial transmission of the pull element 31 more precise, and avoiding asynchronous movement of the electrode plates 21 when the ablation mechanism 2 is opened due to the displacement of the elastic element 73, ensuring the coplanar accuracy and consistent contact of the electrode plates 21.

[0082] The receiving groove 721 can also completely house the elastic element 73 inside the second pull seat 72, forming a closed installation space. This prevents the elastic element 73 from directly rubbing or colliding with components such as the first pull seat 71 and the inner wall of the connecting seat 322, reducing wear on the elastic element 73 and extending its service life. At the same time, it prevents the elastic element 73 from generating debris or fatigue fracture due to external friction, thus avoiding component failure that could affect the safety of the operation.

[0083] In addition, the receiving groove 721 can make the first pull seat 71 and the second pull seat 72 fit more tightly, reduce the installation gap between them, optimize the internal space layout of the handle 5, avoid the overall structure from being bulky due to the dispersion of parts, ensure the compactness of the handle 5, and not affect the installation and operation of other parts. At the same time, it reduces the shaking of the elastic element 73 during the movement and improves the transmission stability of the drive mechanism 3.

[0084] In some embodiments, the observation hole 82 is one of an elongated hole, a round hole, an elliptical hole, or an irregularly shaped hole, as long as the observation effect is guaranteed, and situations where the field of vision is obstructed or it is difficult to see clearly during the observation process are avoided.

[0085] Of course, in some embodiments, the warning sign may be set on the elastic member 73, or the warning sign may be set on the first pull seat 71, and correspondingly, the baffle 712 may be set on the second pull seat 72, etc.

[0086] Furthermore, the handle 5 is provided with a visual panel 6, which is used to cover the observation hole 81. The visual panel 6 facilitates observation of the location of the warning signs, is easy to operate, and does not affect the overall surgical procedure.

[0087] The visible panel 6 can be transparent glass or a display screen, etc.

[0088] In some embodiments, a display is provided on the handle 5, a tension sensor is provided on the pulling member 31, and the tension sensor is electrically connected to the display; and / or a piezoresistive sensor is provided on the electrode plate 21, and the piezoresistive sensor is electrically connected to the display. By providing a tension sensor on the pulling member 31 or a piezoresistive sensor on the electrode plate 21, both electrically connected to the display of the handle 5, the tension sensor can detect the tension value of the pulling member 31 in real time and provide intuitive feedback to the doctor through the display. This allows the doctor to judge the degree of expansion of the ablation mechanism 2 based on the tension data, avoiding damage to the blood vessel wall due to excessive expansion. The piezoresistive sensor can directly detect the contact pressure between the electrode plate 21 and the blood vessel wall, ensuring that the pressure is within a safe and effective range. This ensures good contact between the electrode plate 21 and the blood vessel wall for efficient energy conduction while preventing excessive pressure from damaging the vascular endothelium. The synergistic feedback from the tension sensor and the piezoresistive sensor can also provide doctors with multi-dimensional real-time data support, reduce subjective errors in surgical operations, improve the safety and repeatability of treatment, and solve the operational risks caused by relying on doctors' experience and judgment in existing technologies.

[0089] Furthermore, the visual feedback and the electronic feedback from the sensors provide dual protection. Even in extreme cases where the sensors malfunction, doctors can still determine the operational status through warning signs, further enhancing the safety and reliability of the surgery and avoiding medical risks caused by the failure of a single feedback source. Visual alignment feedback allows for an intuitive assessment of the ablation mechanism 2's open state and the electrode pads 21's contact effectiveness.

[0090] like Figures 1-17As shown in the above, the ablation electrode provided in this embodiment, through the state changes of the ablation mechanism 2, achieves a coplanar annular distribution of multiple electrode pads 21 on the same radial cross section. Combined with radial reciprocating movement, it adapts to renal arteries of different inner diameters, forming a continuous and complete ablation zone to ensure complete blockage of sympathetic nerve fibers. Through the connection between the fluid flow channel 11, the pipeline channel 24, and the electrode pad 21 through-hole 22, physiological saline can be simultaneously introduced during the ablation process of the electrode pad 21, effectively avoiding thrombosis of the electrode pad 21 and excessive damage to the vascular intima. Through the symmetrical arrangement of the two pulling members 31, and the real-time feedback from the elastic member 73, tension sensor, and piezoresistive sensor, uniform contact between the electrode pad 21 and the blood vessel wall and precise pressure control are achieved, improving the stability of the ablation effect. The combination of the warning sign on the second pulling seat 72, the observation hole 82, and the visual panel 6 enables visual state judgment. Simultaneously, the precise transmission of the moving part 32 reduces the difficulty of surgical operation and the impact of individual differences. With its compact structure and convenient operation, it improves the effectiveness and safety of renal artery sympathetic nerve radiofrequency ablation while taking into account clinical suitability and instrument practicality. It provides a better technical solution for interventional treatment of refractory hypertension and effectively solves the problems of discontinuous ablation area, uneven energy distribution, complex operation and poor suitability caused by non-coplanar multi-electrode structures in existing technologies.

[0091] It should be noted that, in this embodiment, the needle tube 1 is initially straight or nearly straight in vitro, but in vivo, it extends from the radial or femoral artery to the renal artery and is curved. The aforementioned axial direction along the needle tube 1 in this embodiment refers to the axial direction of the needle tube 1 in its initial straight tubular form.

[0092] 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.

[0093] The embodiments described above are merely illustrative of 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 the invention patent. 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 protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. An ablation electrode, characterized by, It includes: A needle tube (1); An ablation mechanism (2) connected to the distal end of the needle tube (1), the ablation mechanism (2) has a plurality of ablation ends capable of moving radially along the needle tube (1), each of the ablation ends is provided with an electrode sheet (21), and each of the electrode sheets (21) is uniformly distributed in the circumferential direction of the needle tube (1); A driving mechanism (3) provided on the needle tube (1), the driving mechanism (3) drives the ablation mechanism (2) to switch between the expanded state and the collapsed state, in the process of state switching of the ablation mechanism (2), in the expanded state, each of the electrode sheets (21) protrudes outward to form a ring-shaped ablation area.

2. The ablation electrode of claim 1, wherein, The ablation mechanism (2) includes a plurality of ablation pipelines (23), each of the ablation pipelines (23) constitutes an ablation end, or each of the ablation pipelines (23) is provided with at least one ablation end.

3. The ablation electrode of claim 2, wherein, The ablation pipeline (23) includes a first arm tube (231), an intermediate arm tube (232) and a second arm tube (233) connected in sequence, and the electrode sheet (21) is arranged on the intermediate arm tube (232); In the collapsed state of the ablation mechanism (2), the first arm tube (231), the intermediate arm tube (232) and the second arm tube (233) are all long strip tubular; When switching from the collapsed state to the expanded state, the first arm tube (231) and the second arm tube (233) are bent and deformed, thereby driving the intermediate arm tube (232) provided with the electrode sheet (21) to move outward at least in the radial direction of the needle tube (1).

4. The ablation electrode of claim 2, wherein, It also includes a needle head (4), the ablation mechanism (2) is connected to the needle head (4) and the needle tube (1), the driving mechanism (3) is connected to the needle head (4), and the state of the ablation mechanism (2) is switched by driving the movement of the needle head (4).

5. The ablation electrode of claim 4, wherein, The driving mechanism (3) includes a pulling member (31), the pulling member (31) is movably arranged in the needle tube (1) and connected to the needle head (4), the distance between the needle head (4) and the needle tube (1) is adjusted by the movement of the pulling member (31), so that the ablation pipeline (23) moves.

6. The ablation electrode of claim 5, wherein, It also includes a handle (5), one end of the needle tube (1) away from the ablation mechanism (2) is arranged on the handle (5), the driving mechanism (3) further includes a moving component (32) arranged on the handle (5), the moving component (32) includes: A gear (321) rotatably arranged on the handle (5), and the gear (321) at least partially protrudes from the handle (5); A connecting seat (322) movably arranged in the handle (5) along the axial direction of the needle tube (1), a first end of the connecting seat (322) penetrates the middle of the gear (321) and threadedly cooperates with the gear (321), and one end of the pulling member (31) away from the needle head (4) is connected to the connecting seat (322).

7. The ablation electrode of claim 6, wherein, Further comprising an elastic buffering mechanism (7) arranged in the transmission path of the driving mechanism (3), configured to cause additional deformation of the elastic buffering mechanism (7) when the electrode sheet (21) is in contact with the blood vessel wall, while the displacement of the pulling member (31) remains substantially unchanged.

8. The ablation electrode of claim 7, wherein, Further comprising a state indicating mechanism (8) linked with the elastic buffering mechanism (7), configured to provide visual indication that the electrode sheet (21) has formed effective contact with the blood vessel wall in response to the additional deformation of the elastic buffering mechanism (7).

9. The ablation electrode of claim 5, wherein, The needle tube (1) is provided with a liquid flow channel (11) therein, and physiological saline flows through the liquid flow channel (11); the ablation pipeline (23) is provided with a pipeline channel (24) therein, and the pipeline channel (24) is in communication with the liquid flow channel (11); and the electrode sheet (21) is provided with a plurality of through holes (22) therein, and the through holes (22) are in communication with the corresponding pipeline channels (24).

10. The ablation electrode of claim 9, wherein, The pulling member (31) is provided with at least two, the needle tube (1) has an inner wall surface (12) and an outer wall surface (13), the inner wall surface (12) is surrounded to form the liquid flow channel (11), and the inner wall surface (12) and the outer wall surface (13) are a wall portion (14); each pulling member (31) is symmetrically arranged in the needle tube (1), and each pulling member (31) penetrates the wall portion (14) of the needle tube (1).

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