Radiofrequency ablation device

Abstract

The present invention provides a radiofrequency ablation device, belonging to the field of ablation devices, including a slender body, an electrode assembly and multiple groups of thermocouples are arranged on the slender body, the end of the slender body is a plane, a groove is arranged in the middle of the end of the slender body, the multiple groups of thermocouples include a terminal temperature sensing part, and the terminal temperature sensing part is arranged on the bottom wall of the groove; the electrode assembly includes a terminal electrode part, the terminal electrode part is arranged on the plane of the end of the slender body, and the terminal electrode part is thermally insulated from the terminal temperature sensing part; a peripheral transition ramp is arranged between adjacent electrodes of the terminal electrode part; the multiple groups of thermocouples also include a first annular temperature sensing part, the first annular temperature sensing part is located on the peripheral side of the slender body, and is located at the junction of each transition ramp and the peripheral side of the slender body. This technical solution increases the height difference between the terminal electrode part and the terminal temperature sensing part by physical means, reduces direct heat radiation, and improves the temperature monitoring accuracy.

Description

Technical Field

[0001] The present invention generally relates to the field of ablation devices, and in particular to a radiofrequency ablation device. Background Art

[0002] Tissue ablation is the process of destroying diseased tissue by causing local tissue cells to undergo coagulative necrosis, dehydration necrosis or carbonization through physical or chemical methods.

[0003] The main methods of physical ablation include radiofrequency ablation, microwave ablation, cryoablation and laser ablation; while chemical ablation mainly includes ethanol ablation and acetic acid ablation. Among them, radiofrequency ablation uses the heat generated by high-frequency current to increase the temperature of local tissues, thereby causing coagulative necrosis of tissues. It is often used to treat arrhythmias, liver tumors, kidney tumors, etc.

[0004] Radiofrequency ablation requires the assistance of an angiography machine to allow the catheter to penetrate deep into the veins. Therefore, when the catheter is moving and working, it is extremely important to sense the working area. Therefore, the assistance of sensors is needed to understand environmental parameters, such as temperature sensors. Conventional temperature sensors are only evenly distributed around the catheter. Due to their size, some temperature sensors are too close to the radiofrequency electrodes, making it impossible for some temperature sensors to accurately sense the ambient temperature.

[0005] Therefore, the inventors believe that the environmental data of the catheter needs to be more accurate when radio frequency is working. Summary of the invention

[0006] According to the present invention, in view of the problems existing in the prior art, a radiofrequency ablation device is provided, comprising a slender body, on which an electrode assembly and a plurality of thermocouples are arranged, characterized in that:

[0007] The end of the elongated body is a plane, a groove is arranged in the middle of the end of the elongated body, and the multiple groups of thermocouples include an end temperature sensing part, and the end temperature sensing part is arranged on the bottom wall of the groove;

[0008] The electrode assembly includes a terminal electrode portion, which is arranged on a plane at the terminal end of the elongated body and is located on the peripheral side of the terminal temperature sensing portion, and the terminal electrode portion is thermally insulated from the terminal temperature sensing portion;

[0009] A transition ramp for connecting the bottom of the groove and the circumferential side of the elongated body is provided between adjacent electrodes of the terminal electrode part;

[0010] The plurality of sets of thermocouples further include a first annular temperature sensing portion, which is located at the circumference of the elongated body and at the junction of each transition ramp and the circumference of the elongated body;

[0011] The elongated body is provided with a conductor connected to the electrode assembly for transmitting energy to the electrode assembly so that the electrode assembly causes trauma to the tissue surface. With the above technical features, the terminal temperature sensing part is located at the bottom wall of the groove, forming a drop with the terminal electrode part, and is physically far away from the terminal electrode part, reducing most of the direct impact caused by the terminal electrode part, and indirectly ensuring the temperature measurement accuracy of the area in front of the terminal temperature sensing part; due to the thermal effect generated by the operation of the terminal electrode part, the surrounding blood is heated up, driving the blood flow rate to accelerate, and the blood flow rate on the transition ramp is accelerated, and the first annular temperature sensing part is located at the end of the transition ramp, so that the surrounding blood environment frequently contacts the first annular temperature sensing part, indirectly improving the temperature measurement accuracy of the first annular temperature sensing part, thereby helping the staff to grasp the accurate temperature changes of the ablation operation through the environmental temperature of different areas, ensuring the safety of the ablation operation, and the terminal temperature sensing part and the first annular temperature sensing part are effectively away from the heat source by physical means, and the accuracy of temperature sensing is also improved.

[0012] In some embodiments, the plurality of thermocouples further include a second annular temperature sensing portion, which is spaced apart from the first annular temperature sensing portion and is located on the side of the first annular temperature sensing portion away from the end of the slender body. Thus, the second annular temperature sensing portion is spaced apart from the first annular temperature sensing portion, which helps to understand the temperature changes in different regions of the slender body, as well as the radiation range of thermal radiation and the temperature change rate.

[0013] In some embodiments, the thermocouples of the second annular temperature sensing portion are staggered with the thermocouples of the first annular temperature sensing portion in circumferential positions. Thus, when the elongated body moves in the blood vessel, the staggered thermocouples help monitor the blood temperature in multiple regions, thereby improving the range and accuracy of the monitoring environment.

[0014] In some embodiments, the electrode assembly further comprises a first annular electrode portion, the terminal plane of the elongated body is connected to the peripheral side by an arc transition, the first annular electrode portion is spaced and distributed in the arc transition area, and each electrode is arranged perpendicular to the surface where the fixed area is located. Thus, the first annular electrode portion increases the area of ​​heat radiation, and the operating range can be adjusted according to the actual area of ​​the patient's foreign body point. Since the first annular electrode portion is located in the arc transition area, the rotation or displacement operation of the elongated body can also be reduced according to its position direction.

[0015] In some embodiments, the electrode assembly further comprises a second annular electrode portion, which is distributed around the slender body and close to the end region of the slender body. Thus, due to the different positions of the ectopic nodes of the patient and the limitations of the operation on the end of the slender body, the second annular electrode portion can be used for targeted thermal radiation ablation, thereby reducing the limitations of the slender body during use.

[0016] In some embodiments, the conductor is a plurality of independent conductors and is respectively connected to the terminal electrode portion, the first annular electrode portion, and the second annular electrode portion. Thus, according to the positional relationship between the slender body and the ectopic site, the energy of the electrodes in the three regions can be reasonably controlled, which improves the accuracy of ablation on the one hand, and reduces the limitations of the operation of the slender body on the other hand.

[0017] In some embodiments, the circumference of each thermocouple is coated with a thermal insulation layer, and the end of each thermocouple is provided with a flange member fixed to the elongated body and coated with the thermal insulation layer.

[0018] In some embodiments, a flushing channel is further provided in the elongated body, and at least one outlet is provided at the end of the flushing channel, and the outlet is opened on the bottom wall of the transition ramp. Therefore, a large amount of heat will be generated during the radiofrequency ablation process, and the introduced cooling liquid will directly act on the radiofrequency area, reducing the excessive damage to the surrounding normal tissues caused by the local excessive temperature. Moreover, the outlet is located on the bottom wall of the transition ramp, which is not only close to the electrode area, but also separates the terminal temperature sensing part from the terminal electrode part, ensuring the accuracy of the terminal temperature sensing part to the surrounding temperature environment. Moreover, the flowing cooling liquid is in direct contact with the blood in the transition ramp. With the introduction of the cooling liquid, the flow efficiency of the blood around the outlet is also accelerated, indirectly expanding the contact frequency between the blood in different areas and the first annular temperature sensing part, and improving the accuracy of the measurement.

[0019] In some embodiments, the elongated body is provided with a plurality of peripheral heat conducting members, which are thermally connected to the terminal electrode portion, the first annular electrode portion, and the second annular electrode portion;

[0020] The slender body is also provided with a plurality of longitudinal heat-conducting members, which are thermally connected to a plurality of peripheral heat-conducting members and extend in a direction away from the end of the slender body. Thus, the peripheral heat-conducting members can disperse the heat of the electrodes in the annular area, and the longitudinal heat-conducting members can transfer the heat accumulated on the peripheral heat-conducting members to the concentrated area away from the heat, so that the heat of the slender body itself is more dispersed, reducing the influence of excessive temperature on the surrounding healthy tissues.

[0021] In some embodiments, an annular flow guiding cavity is provided in the elongated body, and the flow guiding cavity is thermally connected to the longitudinal heat conducting member;

[0022] The slender body is provided with a liquid inlet pipe for circulating cooling liquid and interconnected with the flow guiding cavity, and a liquid outlet pipe interconnected with the flow guiding cavity. Thus, a circulating cooling channel is formed in the slender body, and the heat carried by the deep heat conducting member is transferred to the outside of the body. Moreover, the flow guiding cavity is annular and does not hinder the connection of the circuit. Moreover, it is an annular area close to the circumference of the slender body, which has the effect of transferring the heat of the circumference of the slender body, and also has the effect of cooling the inside of the slender body.

[0023] It should be understood that the contents described in the summary of the invention are not intended to limit the key or important features of the embodiments of the present disclosure, nor are they intended to limit the scope of the present disclosure. Other features of the present disclosure will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 A schematic diagram of the overall structure of a radiofrequency ablation device provided by an embodiment of the present invention is shown;

[0025] Figure 2 A schematic diagram of the three-dimensional structure of the end of a slender body in a radiofrequency ablation device provided by an embodiment of the present invention is shown;

[0026] Figure 3 A schematic diagram of the end surface structure of an execution part in a radiofrequency ablation device provided by an embodiment of the present invention is shown;

[0027] Figure 4 A partial cross-sectional view of a slender body of a radiofrequency ablation device provided by an embodiment of the present invention is shown;

[0028] Figure 5 A cross-sectional view of a thermocouple thermal insulation structure of a radio frequency ablation device provided by an embodiment of the present invention is shown.

[0029] Explanation of symbols

[0030] 1. Slender body; 11. Executing part; 111. Groove; 112. Transition ramp; 12. Conveying part; 2. Handle; 21. Interface; 3. Liquid supply device; 4. Electrode assembly; 41. Terminal electrode part; 42. First annular electrode part; 43. Second annular electrode part; 5. Multiple groups of thermocouples; 51. Terminal temperature sensing part; 52. First annular temperature sensing part; 53. Second annular temperature sensing part; 61. Flushing channel; 62. Outlet; 71. Peripheral heat-conducting part; 72. Longitudinal heat-conducting part; 81. Diversion cavity; 82. Liquid inlet pipe; 83. Liquid outlet pipe; 91. Thermal insulation layer; 92. Flange. DETAILED DESCRIPTION

[0031] Hereinafter, preferred embodiments (or implementation modes) of the present invention will be described in detail with reference to the accompanying drawings.

[0032] refer to Figure 1-Figure 5 A radiofrequency ablation device of the present invention is described.

[0033] Figure 1 FIG. 1 is a schematic diagram showing the overall structure of a radiofrequency ablation device provided by an embodiment of the present invention. Figure 1 As shown, a radiofrequency ablation device provided in this embodiment includes a slender body 1, and a handle 2 connected to the slender body 1, and a liquid supply device 3 is provided at the tail of the handle 2 connected to the part of the slender body 1. The slender body 1 can be a catheter, and includes a distal actuator 11 and a conveying portion 12 located at the tail of the actuator 11. The handle 2 is located at the end of the conveying portion 12. The handle 2 can control the catheter to extend into the vein and convey the actuator 11 to the area in the body that needs to be ablated for operation. The liquid supply device 3 includes an internal environment cooling mechanism and an external environment cooling mechanism, both of which have independent containers, independent pump bodies, and independent coolants, and are passed into the interior of the slender body 1 through the interface 21 to achieve cooling of the interior of the slender body 1 and the external environment where the end of the slender body 1 is located. The slender body 1 is mainly to the catheter.

[0034] Figure 2 FIG. 1 is a schematic diagram showing a three-dimensional structure of an end portion of a slender body 1 in a radiofrequency ablation device provided by an embodiment of the present invention. Figure 2 As shown, the execution part 11 of the elongated body 1 is provided with an electrode assembly 4 and a plurality of thermocouples 5. The electrode assembly 4 includes a terminal electrode portion 41, a first annular electrode portion 42 and a second annular electrode portion 43; the plurality of thermocouples 5 includes a terminal temperature sensing portion 51, a first annular temperature sensing portion 52 and a second annular temperature sensing portion 53.

[0035] Figure 3 FIG. 1 is a schematic diagram showing the end structure of an execution part 11 in a radiofrequency ablation device provided by an embodiment of the present invention. Figure 2 and Figure 3 As shown, the end of the elongated body 1 is a plane, and the middle area thereof is sunken to form a groove 111. The groove 111 may be a circular area, so that the side of the groove 111 is more evenly spaced from the edge of the end of the actuator 11. The terminal temperature sensing portion 51 is fixed to the bottom surface of the groove 111. The terminal temperature sensing portion 51 includes at least one thermocouple, which is evenly arranged in a ring shape at the bottom of the groove 111. In this embodiment, the thermocouple of the terminal temperature sensing portion 51 is taken as an example, and is located in the central area of ​​the groove 111.

[0036] The terminal electrode portion 41 is fixed on the end face of the actuator 11. The terminal electrode portion 41 includes at least three RF electrodes, which are equidistantly distributed on the end face of the actuator 11 in a circular pattern around the groove 111 in the middle. In this embodiment, four RF electrodes are used as an example. In some embodiments, the axis of the RF electrode in each terminal electrode portion 41 is perpendicular to the fixed plane, so that the final RF range is more dispersed. In some embodiments, the axis of the RF electrode in each terminal electrode portion 41 points to a common point of action, which is located on the extension line of the center line of the actuator 11, so that when the terminal electrode portion 41 is working in RF mode, its radiation range is more concentrated and the effect is more efficient.

[0037] Due to the height difference between the end face of the actuator 11 and the groove 111, the terminal temperature sensing part 51 physically avoids most of the direct radiation of the terminal electrode part 41, so that the temperature sensing area of ​​the terminal temperature sensing part 51 is closer to the area at the end of the actuator 11, thereby improving the accuracy of the temperature detection by the terminal temperature sensing part 51.

[0038] A transition ramp 112 is provided between two adjacent RF electrodes in the terminal electrode part 41, and one end of the transition ramp 112 is connected to the groove 111, and the other end is connected to the peripheral side of the execution part 11. The first annular temperature sensing part 52 is provided on the peripheral side of the execution part 11, and is located in the annular area connected to the transition ramp 112. The first annular temperature sensing part 52 includes a plurality of thermocouples, and the thermocouples are fixed at the connection between each transition ramp 112 and the peripheral side of the execution part 11, and at least one thermocouple is provided at each connection. On the one hand, the first annular temperature sensing part 52 forms a height difference with the terminal temperature sensing part 51, which increases the temperature measurement area while avoiding the high temperature influence caused by the RF electrode, and also feedbacks the temperature changes in different areas and the rate of temperature conduction; on the other hand, when the RF electrode works, the temperature of the peripheral blood will rise, thereby increasing the blood flow efficiency, and the blood flow space provided by the transition ramp 112 also increases the contact frequency between the blood and the thermocouples of the first annular temperature sensing part 52, indirectly improving the accuracy of the temperature measurement of the first annular temperature sensing part 52.

[0039] The above-mentioned second annular temperature sensing part 53 is spaced apart from the first annular temperature sensing part 52 and is located on the side of the first annular temperature sensing part 52 away from the end temperature sensing part 51. The second annular temperature sensing part 53 includes a plurality of thermocouples, which are fixed on the circumference of the execution part 11 and are evenly distributed, and the thermocouples of the second annular temperature sensing part 53 and the thermocouples of the first annular temperature sensing part 52 are staggered in circumferential positions. While increasing the temperature measurement area, the blood flow path is also taken into consideration, and the ambient temperature on the circumference of the execution part 11 is more comprehensively controlled, which is beneficial to real-time grasp of the ambient temperature changes on the circumference of the execution part 11 during ablation operation, thereby increasing the safety of the ablation operation.

[0040] The end of the actuator 11 is connected to the circumferential side through an arc transition, and the above-mentioned first annular electrode part 42 includes multiple groups of RF electrodes, each group of RF electrodes is provided with at least 2, and is evenly distributed in the arc transition area in a circular shape, and the axis of each RF electrode is perpendicular to the arc fixed area where it is located, thereby increasing the breadth of the overall RF range, cooperating with the joint work of the end electrode part 41, and increasing the overall RF area range.

[0041] The second annular electrode portion 43 is located on the circumferential side of the actuator 11 and is arranged near the end of the actuator 11. The second annular electrode portion 43 includes a plurality of radio frequency electrodes, which are equidistantly distributed in the circumferential area of ​​the actuator 11. In addition, the terminal electrode portion 41, the first annular electrode portion 42, and the second annular electrode portion 43 are all provided with energy by independent conductors, so that various combinations of energy supply can be performed according to different situations in the ablation operation, avoiding the operation blind spot of the movement or rotation of the slender body 1, and ensuring the effectiveness of the ablation operation.

[0042] Figure 4 FIG. 1 is a partial cross-sectional view of a slender body 1 of a radiofrequency ablation device provided by an embodiment of the present invention. Figure 4 As shown, during the ablation operation, the radio frequency electrode at the end of the actuator 11 generates a large amount of heat. If the heat accumulates for a long time, it will not only damage the actuator 11 and affect the accuracy of the temperature monitoring of the multiple sets of thermocouples 5; it will also cause trauma to the healthy regional tissues in the body. Therefore, the inside of the slender body 1 is also provided with a flushing channel 61, which is arranged inside the slender body 1 along the length direction of the slender body 1, one end of which extends into the handle 2 and is interconnected with the external environment cooling mechanism; the other end of which extends to the end of the actuator 11 and disperses multiple outlets 62 and is opened on the bottom wall of each transition ramp 112. The cooling liquid used in the external environment cooling mechanism can be low-temperature blood or cold saline. With the ablation operation, the cooling liquid is supplied into the slender body 1 through the pump body of the external environment cooling mechanism to reduce the temperature of the peripheral area of ​​the actuator 11, and the orientation of each outlet 62 is perpendicular to the bottom wall of the transition ramp 112, so that the cooling liquid is distributed more widely, which can be applied to the terminal electrode part 41, the first annular electrode part 42, and the second annular electrode part 43 to work simultaneously. In addition, during the discharge of the cooling liquid, the terminal electrode part 41 and the terminal temperature sensing part 51 are separated, so that the temperature sensing space of the terminal electrode part 41 is more independent, which ensures the accuracy of the peripheral temperature sensing environment of the terminal temperature sensing part 51, and the flowing cooling liquid is in direct contact with the blood on the transition ramp 112. With the introduction of the cooling liquid, the flow efficiency of the blood around the outlet 62 is also accelerated, which indirectly expands the contact frequency between the blood in different areas and the first annular temperature sensing part 52, and improves the accuracy of the measurement.

[0043] refer to Figure 3 and Figure 4 During the ablation operation, the RF electrode itself will also generate a lot of heat. If the high-temperature RF electrode contacts healthy tissue, it is easy to cause tissue damage. Therefore, the surface of the actuator 11 is also provided with a heat-conducting component assembly to disperse the heat of the RF electrode. The heat-conducting component assembly includes a circumferential heat-conducting component 71 and a longitudinal heat-conducting component 72. There are multiple circumferential heat-conducting components 71, which are located in the fixed area of ​​the terminal electrode part 41, the first annular electrode part 42, and the second annular electrode part 43, and thermally connect the surrounding RF electrodes to each other; and the longitudinal heat-conducting component 72 is fixed at intervals on the outer peripheral surface of the actuator 11, and is thermally connected to multiple circumferential heat-conducting components 71. The heat-conducting component assembly is mainly made of diamond material, and its thermal conductivity is about 2000~2200W / m・K, which is 5 times that of copper, and can efficiently conduct the generated heat. When the RF electrode is working, its own heat will be transferred to the peripheral heat conductive member 71 and uniformly gathered on the longitudinal heat conductive member 72 , thereby transferring most of the heat away from the end of the actuator 11 .

[0044] refer to Figure 4 The slender body 1 is also provided with an internal circulation cooling channel, which includes an annular flow guiding cavity 81, a liquid inlet pipe 82 and a liquid outlet pipe 83 interconnected with the flow guiding cavity 81, and the liquid inlet pipe 82 and the liquid outlet pipe 83 are both located in the slender body 1, and extend toward the handle 2, and finally interconnected with the internal environment cooling mechanism. The flow guiding cavity 81 is located at the end of the deep heat conducting member 72 and is thermally connected to the end of each deep heat conducting member 72. During the blending operation, the internal environment cooling mechanism provides flowing coolant into the slender body 1, and the coolant can transfer the heat accumulated on the deep heat conducting member 72 out of the slender body 1, thereby reducing most of the heat accumulation on the RF electrode. Moreover, the annular flow guide cavity 81 can transfer the heat carried by the deep heat conductor 72 on the one hand, and on the other hand, it is close to the external area of ​​the actuator 11, which is beneficial to the overall heat dissipation of the actuator 11. Moreover, its annular arrangement does not affect the line connectivity of the many actuator 11 components and sensors at the end of the actuator 11. While ensuring the cooling of the slender body 1, it also ensures the normal and stable operation of the ablation operation.

[0045] A chip is also provided inside the handle 2, and the chip is electrically connected to the electrode assembly 4 and multiple groups of thermocouples 5 at the end of the slender body 1. The temperature data measured in real time by the multiple groups of thermocouples 5 can be transmitted to the chip. The end of the handle 2 is also provided with an interface 21 electrically connected to the chip, and the interface 21 is used to connect with the radio frequency signal generator and the PC end. The radio frequency signal generator can transmit a radio frequency signal to the electrode assembly 4 to perform ablation at the end of the slender body 1, and can also freely adjust the combination of the end electrode part 41, the first annular electrode part 42, and the second annular electrode part 43 to adapt to different ablation conditions. The temperature data transmitted in real time by the multiple groups of thermocouples 5 can be displayed and stored on the computer end to monitor physical signs during the ablation operation.

[0046] Figure 5 FIG. 1 shows a cross-sectional view of a thermocouple thermal insulation structure of a radiofrequency ablation device provided by an embodiment of the present invention, referring to FIG. Figure 5 As shown, each thermocouple in the above-mentioned multiple groups of thermocouples 5 is thermally insulated, and the circumference of each thermocouple is coated with a tubular thermal insulation layer 91. The thermal insulation layer 91 can be made of aerogel or aluminum foil. In order to increase the stability of the thermocouple fixed to the actuator 11, a flange 92 is provided at its end. The diameter of the central area of ​​the flange 92 is larger than the diameter of the thermocouple, and an oblique incision is opened in the middle annular area. The thermal insulation layer 91 is squeezed by fixing the flange 92 to the end of the actuator 11, so that the thermocouple is fixed in the designated area of ​​the actuator 11, and the thermocouple and the inner wall of the flange 92 do not contact each other, thereby avoiding direct heat transfer.

[0047] The end of the actuator 11 also includes a contact sensing subsystem, which includes a signal source and a processing device, wherein the processing device is integrated inside the chip, the signal source is configured to deliver a certain range of frequencies to the electrode assembly 4, and the processing device is configured to obtain impedance measurements when different frequencies within the frequency range are applied to the electrode assembly 4 by the signal source, process the impedance measurements obtained at different frequencies, and determine whether the electrode assembly 4 is in contact with the tissue based on the processing of the impedance measurements.

[0048] In the description of this specification, the terms "connection", "installation", "fixation" and the like should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0049] The above are only preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A radiofrequency ablation device, comprising a slender body (1), on which an electrode assembly (4) and a plurality of sets of thermocouples (5) are arranged, characterized in that: The end of the slender body (1) is a plane, a groove (111) is provided in the middle of the end of the slender body (1), and the plurality of sets of thermocouples (5) include an end temperature sensing portion (51), and the end temperature sensing portion (51) is provided on the bottom wall of the groove (111); The electrode assembly (4) comprises an end electrode portion (41), the end electrode portion (41) being arranged on a plane at the end of the elongated body (1) and being located on the peripheral side of the end temperature sensing portion (51), the end electrode portion (41) being thermally insulated from the end temperature sensing portion (51); A circumferential transition ramp (112) for connecting the bottom of the groove (111) and the slender body (1) is provided between adjacent electrodes of the terminal electrode portion (41); The plurality of sets of thermocouples (5) further include a first annular temperature sensing portion (52), wherein the first annular temperature sensing portion (52) is located on the peripheral side of the slender body (1) and is located at the junction of each transition ramp (112) and the peripheral side of the slender body (1); The elongated body (1) is provided with a conductor connected to the electrode assembly (4) for transmitting energy to the electrode assembly (4) so ​​that the electrode assembly (4) causes trauma to the tissue surface.

2. A radiofrequency ablation device according to claim 1, characterized in that: The plurality of sets of thermocouples (5) further include a second annular temperature sensing portion (53), which is spaced apart from the first annular temperature sensing portion (52) and is located on a side of the first annular temperature sensing portion (52) away from the end of the elongated body (1).

3. A radiofrequency ablation device according to claim 2, characterized in that: The thermocouples of the second annular temperature sensing portion (53) and the thermocouples of the first annular temperature sensing portion (52) are arranged in an alternating circumferential position.

4. The radiofrequency ablation device according to claim 1, characterized in that: The electrode assembly (4) further comprises a first annular electrode portion (42), the end plane of the elongated body (1) being connected to the peripheral side via an arc transition, the first annular electrode portions (42) being distributed at intervals in the arc transition region, and each electrode being arranged perpendicular to the fixed region where it is located.

5. The radiofrequency ablation device according to claim 4, characterized in that: The electrode assembly (4) further comprises a second annular electrode portion (43), which is distributed on the circumference of the elongated body (1) and close to the end region of the elongated body (1).

6. A radiofrequency ablation device according to claim 5, characterized in that: The conductors are multiple groups of independent conductors and are respectively connected to the terminal electrode part (41), the first annular electrode part (42), and the second annular electrode part (43).

7. The radiofrequency ablation device according to claim 1, characterized in that: The circumference of each thermocouple is coated with a heat insulating layer (91), and the end of each thermocouple is provided with a flange member (92) fixed to the elongated body (1) and coated with the heat insulating layer.

8. The radiofrequency ablation device according to claim 1, characterized in that: The elongated body (1) is also provided with a flushing channel (61) for introducing cooling liquid. The end of the flushing channel (61) is provided with at least one outlet (62), and the outlet (62) is opened on the bottom wall of the transition ramp (112).

9. The radiofrequency ablation device according to claim 5, characterized in that: The elongated body (1) is provided with a plurality of peripheral heat-conducting members (71) which are thermally connected to the terminal electrode portion (41), the first annular electrode portion (42), and the second annular electrode portion (43); The slender body (1) is also provided with a plurality of longitudinal heat-conducting members (72), the longitudinal heat-conducting members (72) being thermally connected to the plurality of peripheral heat-conducting members (71) and extending in a direction away from the end of the slender body (1).

10. The radiofrequency ablation device according to claim 9, characterized in that: An annular flow guiding cavity (81) is provided in the slender body (1), and the flow guiding cavity (81) is thermally connected to the longitudinal heat conducting member (72); The slender body (1) is provided with a liquid inlet pipe (82) for circulating cooling liquid and communicating with the flow guiding cavity (81), and a liquid outlet pipe (83) communicating with the flow guiding cavity (81).

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