Bipolar inner-cooling radiofrequency ablation needle capable of accurately detecting and positioning

Abstract

The invention relates to the technical field of medical equipment, in particular to a bipolar inner-cooling radiofrequency ablation needle capable of accurately detecting and positioning. After an operator introduces the needle body into a focus tissue, cooling liquid flows into the inner tube through the water inlet tube and then flows into a gap between the inner tube and the negative electrode connecting tube for cooling, and meanwhile, the positive electrode radio frequency connecting line and the negative electrode radio frequency connecting line are started to measure an inductive resistance value between the needle tip and the outer needle tube; whether the area where the needle head is located reaches the working range or not is judged for positioning, after positioning is completed, the radio frequency line is used for transmitting energy to the needle point and the working area of the outer needle tube for radio frequency ablation, and during the period, the temperature control probe on the temperature measurement connecting line senses the temperature of the needle point for auxiliary temperature control to prevent overheating. The needle point is positioned by effectively utilizing the change of the resistance value between tissues, and meanwhile, the temperature control and ablation of radio frequency are realized, so that the stability and the practicability are better, and the popularization and the use of equipment are facilitated.

Description

Technical Field

[0001] The present invention relates to the technical field of medical equipment, and in particular to a bipolar internally cooled radiofrequency ablation needle capable of accurate detection and positioning. Background Art

[0002] Currently, most of the ablation needles available on the market are monopolar internal cooling structures and are mostly used for the treatment of tumor diseases. There is a lack of equipment that can deal with varicose vein complications, such as veins with blood tissue. Monopolar ablation needles need to be used in conjunction with negative plates to complete puncture and ablation treatment under ultrasound guidance. Since the working area of the needle tip is visualized and observed through the ultrasound principle of the ultrasound probe, the ultrasound visualization effect of the needle body is not good for puncture operations on different tissues with different diseases. A product is needed that can assist in identification and positioning, and at the same time, can achieve radiofrequency ablation without the need for a negative plate. Summary of the Invention

[0003] In order to solve the above problems existing in the prior art, the purpose of the present invention is to provide a bipolar internally cooled radiofrequency ablation needle that can accurately detect and locate puncture operations on different tissues for different diseases, and can perform ablation operations without a negative plate.

[0004] The technical solution adopted by the present invention is: a bipolar internally cooled radiofrequency ablation needle that can accurately detect and locate, including a needle tip, a negative pole connecting tube is provided in the middle of the needle tip, an outer needle tube is sleeved on the outer side of the negative pole connecting tube, an insulating ring is provided between the needle tip and the outer needle tube, an inner tube is provided in the inner cavity of the negative pole connecting tube, an end of the inner tube away from the needle tip is connected to a water inlet pipe, a diverter is provided at the end of the negative pole connecting tube away from the needle tip, a water outlet pipe is provided on the diverter, the inner tube passes through the diverter, a negative pole radiofrequency connecting wire is provided on the needle tip, a positive pole radiofrequency connecting wire is provided on the outer needle tube, the positive pole radiofrequency connecting wire and the negative pole radiofrequency connecting wire are connected to a radiofrequency wire at the end away from the connection point, and the radiofrequency wire is connected to a radiofrequency generating device.

[0005] In one embodiment, a temperature measuring connecting line is provided in the inner cavity of the inner tube, and a temperature control probe is provided at one end of the temperature measuring connecting line close to the needle tip. The temperature measuring connecting line is connected to a monitoring device, and the monitoring device obtains the temperature near the needle tip and controls the flow and flow rate of the water outlet pipe and the water inlet pipe.

[0006] In one embodiment, an inner insulating tube is provided between the negative electrode connecting tube and the outer needle tube, and the inner insulating tube abuts against the needle tip.

[0007] In one embodiment, an outer insulating sleeve is sleeved on the outer side of the outer needle tube, the outer insulating sleeve is fixedly sleeved on the outer needle tube, and a locator is provided at one end of the outer insulating sleeve away from the needle tip.

[0008] In one embodiment, the end face of the outer needle tube close to the needle tip is inclined, the end face of the needle tip close to the outer needle tube is parallel to the inclined end face of the outer needle tube, and the needle tip, the insulating ring and the outer side of the outer needle tube are provided with a connected overflow groove, and the surface of the overflow groove is coated with insulating material.

[0009] In one embodiment, the overflow groove is a spiral groove structure, and the spiral progressive direction of the overflow groove is perpendicular to the slope direction of the tangent point at the intersection of the insulating ring.

[0010] In one embodiment, the needle tip includes several partial needle bodies, the insulating ring includes several separators, the partial needle bodies and the separators present the same shape of equally divided cone structures, and several partial needle bodies and the separators are combined into a cone in an alternating ring array. Several extension blocks are provided between the partial needle body and the outer needle tube, and several detection blocks are provided between the separator and the outer needle tube. The abutment between the extension block and the outer needle tube, the abutment surface between the partial needle body and the separator, and the abutment between the extension block and the detection block are filled with insulating glue.

[0011] In one embodiment, the outer sides of the portion of the needle body and several of the extension blocks, and the outer sides of the separator and several of the detection blocks are provided with interconnected overflow grooves.

[0012] In one embodiment, the plurality of extension blocks and the detection block are uniformly twisted along the central axis of the outer needle tube.

[0013] In one embodiment, the separator is made of a metal conductor.

[0014] The beneficial effects of the present invention are as follows: the present invention is a bipolar internally cooled radiofrequency ablation needle capable of precise detection and positioning, which can be used for puncturing different tissues for different diseases and can also perform ablation without a negative plate. The specific implementation method is as follows: The operator first uses the water inlet pipe to introduce the liquid into the inner tube, and then continues to flow into the diverter through the gap between the inner tube and the negative electrode connecting tube. The diverter is a sealed cavity, which mainly realizes the buffering of the liquid. After that, the liquid in the diverter flows out through the outlet pipe. The flow rate of the outlet pipe and the inlet pipe can be controlled to achieve the effect of temperature control of the needle tip and the outer needle tube. In conjunction with the temperature control probe in the inner tube, precise temperature control can be effectively achieved to prevent the phenomenon of scab carbonization caused by excessive tissue impedance during treatment. At the same time, due to the different resistance values between different tissues, a negative radio frequency connecting wire is used to connect the negative connecting tube on the needle tip, and a positive radio frequency connecting wire is used to connect the outer needle tube. A loop is generated by fitting the needle tip and the tissue on the outer needle tube, detecting the resistance change of different tissues and transmitting it to the corresponding radio frequency generator. The resistance value collected by the needle tip is converted into a digital signal by the radio frequency generator and presented to the user. The user determines the specific puncture position of the needle tip working part through the converted digital signal. When the user reaches the treatment position, the radio frequency function button of the radio frequency generator is activated. At this time, the radio frequency energy is transmitted to the working area of the radio frequency ablation needle tip through the radio frequency line. The outer needle tube connected by the positive radio frequency connecting wire and the needle tip connected by the negative radio frequency connecting wire form a high-frequency electric field in the tissue of the electrode coverage area, which promotes the conductive ions and polarized molecules of the tissue cells to run, oscillate, and rub at high speed to generate heat, and generates a spherical or ellipsoidal hot zone at the front end of the ablation needle for surgical treatment. The present invention solves the problem of poor ultrasonic imaging effect mentioned above and greatly improves the treatment efficiency of the operation. At the same time, in actual use, the distance between different tissues is small, and it is easy to puncture multiple tissues in the area from the needle to the outer needle tube, and it is impossible to actually judge the regional changes. At this time, a needle is provided in which the needle tip and the outer needle tube are opposite to each other with an oblique surface. When puncturing a single tissue plane, the needle tip and the outer needle tube are both arranged. Even if puncturing a complex area, the resistance measurement of different layered tissues can still be achieved, effectively improving the positioning accuracy. During the puncture process, the cell part of the tissue liquid adheres to the outer side of the needle body, and the tension of the tissue is used to compress the overflow groove to guide the tissue liquid into the overflow groove, so that the outer side of the needle body directly adheres to the tissue, effectively improving the accuracy of the detection.

[0015] At the same time, in order to achieve deeper needle positioning, the needle tip is divided into multiple parts, so that part of the needle body and the separator are alternately connected, and the separator and the outer needle tube are connected through the detection block. The positive and negative poles of the detection resistor are provided on the plane of the tissue at different positions. If high-depth detection is required, more extension blocks and detection blocks can be added. At the same time, the tension of the tissue is used to compress the overflow groove to guide the tissue liquid into the overflow groove, so that the outside of the needle body is directly attached to the tissue, effectively improving the accuracy of the detection resistance value.

[0016] The device has a simple structure and locates the position and depth of the puncture part by detecting the resistance change between the needle tip and the outer needle tube, effectively assisting the ablation needle in treatment. At the same time, it can perform ablation operations without the need for a negative plate. It has good stability and practicality, which is beneficial to the promotion and use of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention will be further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0018] Figure 1 It is a schematic diagram of the planar structure of the present invention; Figure 2 It is a schematic diagram of a partially exploded three-dimensional structure of the present invention; Figure 3 Schematic diagram of the cross-sectional structure of the needle tip of the present invention; Figure 4 This is a schematic diagram of the second three-dimensional structure of the needle tip of the present invention; Figure 5 This is a schematic diagram of a cross-sectional three-dimensional structure of a second needle tip of the present invention; Figure 6 This is a schematic diagram of the third three-dimensional structure of the needle tip of the present invention; Figure 7 This is a schematic diagram of the third needle tip cross-sectional three-dimensional structure of the present invention.

[0019] Description of the drawings: 1. Needle tip; 101. Overflow trough; 102. Extension block; 103. Detection block; 104. Part of the needle body; 2. Insulation ring; 201. Separator; 3. Outer needle tube; 4. Outer insulating sleeve; 5. Positioner; 6. Handle; 7. Radio frequency line; 8. Water outlet pipe; 9. Water inlet pipe; 10. Temperature control probe; 11. Inner tube; 12. Negative electrode connecting tube; 13. Inner insulating tube; 14. Shunt; 16. Positive electrode radio frequency connecting line; 17. Negative electrode radio frequency connecting line; 18. Temperature measurement connecting line. DETAILED DESCRIPTION

[0020] In order to make the objectives, technical solutions, and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only intended to explain the present invention and are not intended to limit the present invention. That is, the embodiments described herein are only some embodiments of the present invention, not all embodiments. Generally, the components of the embodiments of the present invention described and illustrated in the drawings herein may be arranged and designed in various different configurations.

[0021] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but is merely intended to represent selected embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative work are within the scope of protection of the present invention.

[0022] The following combination Figure 1-7 The specific embodiment of the present invention is described: Reference Figure 1 、 2 3, embodiment 1, a bipolar internally cooled radiofrequency ablation needle capable of precise detection and positioning, comprising a needle tip 1, the needle tip 1 being used to puncture tissue, a negative electrode connecting tube 12 being provided in the middle of the needle tip 1, an outer needle tube 3 being sleeved on the outer side of the negative electrode connecting tube 12, an insulating ring 2 being provided between the needle tip 1 and the outer needle tube 3 to prevent direct connection between the needle tip 1 and the outer needle tube 3, an inner insulating tube 13 being provided between the negative electrode connecting tube 12 and the outer needle tube 3 to prevent errors caused by direct detection current passing through the gap, and the inner insulating tube 13 abutting the needle tip 1; An inner tube 11 is provided in the inner cavity of the negative electrode connecting tube 12, and a temperature measuring connecting line 18 is provided in the inner cavity of the inner tube 11. A temperature control probe 10 is provided at the end of the temperature measuring connecting line 18 close to the needle tip 1. The temperature measuring connecting line 18 is connected to a monitoring device, and the monitoring device obtains the temperature near the needle tip 1 and controls the flow and flow rate of the water outlet pipe 8 and the water inlet pipe 9; the end of the inner tube 11 away from the needle tip 1 is connected to the water inlet pipe 9, and the end of the negative electrode connecting tube 12 away from the needle tip 1 is provided with a diverter 14, and the diverter 14 is provided with a water outlet pipe 8. The inner tube 11 passes through the diverter 14, and a negative electrode radio frequency connecting line 17 is provided on the needle tip 1. A positive electrode radio frequency connecting line 16 is provided on the outer needle tube 3. The positive electrode radio frequency connecting line 16 and the negative electrode radio frequency connecting line 17 are connected to the end away from the connection point connected to the radio frequency line 7, and the radio frequency line 7 is connected to the radio frequency generating device. Specifically, the radio frequency generating device mainly realizes the functions of transmitting energy and resistance detection. It is a prior art and will not be described in detail.

[0023] In practice, due to the different resistance values between different tissues, the negative RF connecting wire 17 is used to connect the negative connecting tube 12 on the needle tip 1, and the positive RF connecting wire 16 is used to connect the outer needle tube 3. A circuit is generated by fitting the tissues on the needle tip 1 and the outer needle tube 3, and the resistance changes of different tissues are detected and transmitted to the corresponding RF generator. The resistance value collected by the needle tip 1 is converted into a digital signal by the RF generator and presented to the user. The user uses the converted digital signal to determine the specific puncture position of the working part of the needle tip 1. When the treatment position is reached, the RF function button of the RF generator is activated. At this time, the RF energy is transmitted to the working area of the RF ablation needle tip 1 through the RF line 7. The outer needle tube 3 connected by the positive RF connecting wire 16 and the needle tip 1 connected by the negative RF connecting wire 17 form a high-frequency electric field in the tissue covered by the electrode, which prompts the conductive ions and polarized molecules of the tissue cells to run, oscillate, and rub at high speed to generate heat, and a spherical or ellipsoidal hot zone is generated at the front end of the ablation needle for surgical treatment.

[0024] Beneficially, an outer insulating sleeve 4 is connected to the outside of the outer needle tube 3, and the outer insulating sleeve 4 is fixedly fitted on the outer needle tube 3. A locator 5 is provided at the end of the outer insulating sleeve 4 away from the needle tip 1. By sliding the locator 5, the distance between it and the tissue is changed, so that the outer needle tube 3 can be positioned on the working section of the tissue.

[0025] The connection of the equipment separated from the working section is fixed by a handle 6 to prevent harm to the user.

[0026] Reference Figure 4 、 5 As shown, embodiment 2, on the basis of embodiment 1, the end face of the outer needle tube 3 close to the needle tip 1 is inclined, the end face of the needle tip 1 close to the outer needle tube 3 is parallel to the inclined end face of the outer needle tube 3, and the outer side of the needle tip 1, the insulating ring 2 and the outer needle tube 3 are provided with a connected overflow groove 101, the surface of the overflow groove 101 is coated with insulating material, and at the same time, the overflow groove 101 is a spiral groove structure, and the spiral progressive direction of the overflow groove 101 is perpendicular to the slope direction of the tangent point at the intersection of the insulating ring 2.

[0027] In practice, the needle tip 1 and the end face of the outer needle tube 3 are directly connected by an obliquely arranged insulating ring 2. During the insertion of the needle body, the change in the resistance value of the needle cross-sectional plane at different heights can be detected to respond to the inclination of the blood vessel or to judge whether the punctured blood vessel position is excessive or insufficient. At the same time, since part of the cell tissue fluid adheres to the outer side of the needle body during the puncture process, the tension of the tissue is used to compress the overflow groove 101 to guide the tissue fluid into the overflow groove 101, so that the outer side of the needle body directly adheres to the tissue, effectively improving the accuracy of the detection.

[0028] Reference Figure 6 、 7As shown, in the third embodiment, based on the first embodiment, the needle tip 1 includes several parts of the needle body 104, the insulating ring 2 includes several separators, the parts of the needle body 104 and the separators present the same shape of equally divided cone structure, dividing the needle head into several parts, and at the same time, the separators are spaced from each other. The separators are made of metal conductors, so that the needle tip 1 can also detect the change of the resistance value, thereby improving the accuracy of the device. The negative radio frequency connection line 17 can be used to connect the part of the needle body 104 on the needle tip 1 and the extension block 102, and the positive radio frequency connection line 16 can be used to connect the separator and the detection block 103, so as to realize real-time resistance detection at different heights of the needle body, and at the same time extend the detection range, effectively dealing with the detection area with higher depth, and several parts of the needle body 104 And the separators are combined into an alternating ring array to form a cone, a number of extension blocks 102 are provided between part of the needle body 104 and the outer needle tube 3, a number of detection blocks 103 are provided between the separator and the outer needle tube 3, and the number is determined according to the actual length of use. The abutment between the extension block 102 and the outer needle tube 3, the abutment surface between part of the needle body 104 and the separator, and the abutment between the extension block 102 and the detection block 103 are filled with insulating glue, and the outer sides of part of the needle body 104 and several extension blocks 102, the outer sides of the separator and several detection blocks 103 are provided with interconnected overflow grooves 101. The tension of the tissue is used to compress the overflow groove 101 to guide the tissue liquid into the overflow groove 101, so that the outer side of the needle body is directly in contact with the tissue, effectively improving the accuracy of the detected resistance value.

[0029] At the same time, several extension blocks 102 and detection blocks 103 are twisted evenly along the central axis of the outer needle tube 3. The even arrangement prevents the needle body from being inserted too deeply, causing some tissue cells to pile up in the overflow groove 101, causing tissue fluid to precipitate into the gap of the needle body, affecting the resistance detection changes between the extension block 102 and the mixed detection block 103.

[0030] Working principle of the present invention: The operator first uses the water inlet pipe 9 to introduce the liquid into the inner tube 11, and then continues to flow into the diverter 14 through the gap between the inner tube 11 and the negative electrode connecting tube 12. The diverter 14 is a sealed cavity, which mainly realizes the buffering of the liquid. After that, the liquid in the diverter 14 flows out through the water outlet pipe 8. The flow rate of the water outlet pipe 8 and the water inlet pipe 9 can be controlled to achieve the effect of temperature control of the needle tip 1 and the outer needle tube 3. In conjunction with the temperature control probe 10 in the inner tube 11, precise temperature control can be effectively achieved to prevent the tissue impedance from being too high and scabbing and carbonizing during treatment. At the same time, due to the different resistance values between different tissues, the negative RF connection line 17 is used to connect the negative connection tube 12 on the needle tip 1, and the positive RF connection line 16 is used to connect the outer needle tube 3. A loop is generated by fitting the tissues on the needle tip 1 and the outer needle tube 3, and the resistance changes of different tissues are detected and transmitted to the corresponding RF generator. The resistance value collected by the needle tip 1 is converted into a digital signal by the RF generator and presented to the user. The user determines the specific puncture position of the working part of the needle tip 1 by the converted digital signal. When the user reaches the treatment position, the RF function button of the RF generator is activated. At this time, the RF energy is transmitted to the working area of the RF ablation needle tip 1 through the RF line 7. The outer needle tube 3 connected by the positive RF connection line 16 and the needle tip 1 connected by the negative RF connection line 17 form a high-frequency electric field in the tissue covered by the electrode, which promotes the conductive ions and polarized molecules of the tissue cells to run, oscillate, and rub at high speed to generate heat, and generates a spherical or ellipsoidal hot zone at the front end of the ablation needle for surgical treatment. The present invention solves the problem of poor ultrasonic imaging effect mentioned above and greatly improves the treatment efficiency of the surgery. At the same time, in actual use, the distance between different tissues is small, and it is easy to puncture multiple tissues in the area from the needle to the outer needle tube 3, and it is impossible to actually judge the regional changes. At this time, a needle is provided in which the needle tip 1 and the outer needle tube 3 are opposite to each other in an oblique manner. When puncturing a single tissue plane, the needle tip 1 and the outer needle tube 3 are both arranged. Even if a complex area is punctured, the resistance measurement of different layered tissues can still be achieved, effectively improving the positioning accuracy. During the puncture process, the cell part of the tissue liquid adheres to the outer side of the needle body, and the tension of the tissue is used to compress the overflow groove 101 to guide the tissue liquid into the overflow groove 101, so that the outer side of the needle body directly adheres to the tissue, effectively improving the accuracy of the detection.

[0031] At the same time, in order to achieve deeper needle positioning, the needle tip 1 is divided into multiple parts, so that part of the needle body 104 and the separator are alternately connected, and the separator and the outer needle tube 3 are connected through the detection block 103. The positive and negative poles of the detection resistor are provided on the planes of the tissue at different positions. If high-depth detection is required, more extension blocks 102 and detection blocks 103 can be added. At the same time, the tension of the tissue is used to compress the overflow groove 101 to guide the tissue liquid into the overflow groove 101, so that the outside of the needle body directly fits the tissue, effectively improving the accuracy of the detection resistance value.

[0032] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0033] The above content is merely an example and explanation of the structure of the present invention. Those skilled in the art of the present invention may make various modifications or additions to the described specific embodiments or replace them in a similar manner. As long as they do not deviate from the structure of the invention or exceed the scope defined by the claims, they shall fall within the scope of protection of the present invention.

Claims

1. A bipolar internally cooled radiofrequency ablation needle capable of precise detection and positioning, characterized by: The invention comprises a needle tip (1), wherein a negative electrode connecting tube (12) is provided in the middle of the needle tip (1), an outer needle tube (3) is sleeved on the outer side of the negative electrode connecting tube (12), an insulating ring (2) is provided between the needle tip (1) and the outer needle tube (3), an inner tube (11) is provided in the inner cavity of the negative electrode connecting tube (12), an end of the inner tube (11) away from the needle tip (1) is connected to a water inlet pipe (9), and an end of the negative electrode connecting tube (12) away from the needle tip (1) is provided with a water inlet pipe (9). A diverter (14) is provided on the diverter (14), a water outlet pipe (8) is provided on the diverter (14), the inner tube (11) passes through the diverter (14), a negative radio frequency connection line (17) is provided on the needle tip (1), a positive radio frequency connection line (16) is provided on the outer needle tube (3), the positive radio frequency connection line (16) and the negative radio frequency connection line (17) are connected to a radio frequency line (7) at one end away from the connection point, and the radio frequency line (7) is connected to a radio frequency generating device.

2. The bipolar internally cooled radiofrequency ablation needle capable of precise detection and positioning according to claim 1, characterized in that: The inner cavity of the inner tube (11) is provided with a temperature measuring connecting line (18), and a temperature control probe (10) is provided at one end of the temperature measuring connecting line (18) close to the needle tip (1). The temperature measuring connecting line (18) is connected to a monitoring device, and the monitoring device obtains the temperature near the needle tip (1) and controls the flow rate and flow velocity of the water outlet pipe (8) and the water inlet pipe (9).

3. The bipolar internally cooled radiofrequency ablation needle capable of precise detection and positioning according to claim 1, characterized in that: An inner insulating tube (13) is provided between the negative electrode connecting tube (12) and the outer needle tube (3), and the inner insulating tube (13) abuts against the needle tip (1).

4. The bipolar internally cooled radiofrequency ablation needle capable of precise detection and positioning according to claim 1, characterized in that: An outer insulating sleeve (4) is sleeved on the outer side of the outer needle tube (3), and the outer insulating sleeve (4) is fixedly sleeved and connected to the outer needle tube (3). A positioner (5) is provided at one end of the outer insulating sleeve (4) away from the needle tip (1).

5. The bipolar internally cooled radiofrequency ablation needle capable of precise detection and positioning according to claim 1, characterized in that: The end face of the outer needle tube (3) close to the needle tip (1) is inclined, and the end face of the needle tip (1) close to the outer needle tube (3) is parallel to the inclined end face of the outer needle tube (3). The needle tip (1), the insulating ring (2) and the outer side of the outer needle tube (3) are provided with a communicating overflow groove (101), and the surface of the overflow groove (101) is coated with insulating material.

6. The bipolar internally cooled radiofrequency ablation needle capable of precise detection and positioning according to claim 5, characterized in that: The overflow groove (101) is a spiral groove structure, and the spiral progressive direction of the overflow groove (101) is perpendicular to the slope direction of the intersection point of the insulating ring (2).

7. The bipolar internally cooled radiofrequency ablation needle capable of precise detection and positioning according to claim 1, characterized in that: The needle tip (1) includes a plurality of partial needle bodies (104), the insulating ring (2) includes a plurality of separators, the partial needle bodies (104) and the separators present an equally divided cone structure of the same form, and the plurality of partial needle bodies (104) and the separators are combined into a cone in an alternating ring array, a plurality of extension blocks (102) are provided between the partial needle body (104) and the outer needle tube (3), a plurality of detection blocks (103) are provided between the separators and the outer needle tube (3), and the abutment between the extension block (102) and the outer needle tube (3), the abutment surface between the partial needle body (104) and the separator, and the abutment between the extension block (102) and the detection block (103) are filled with insulating glue.

8. The bipolar internally cooled radiofrequency ablation needle capable of precise detection and positioning according to claim 7, characterized in that: The peripheral sides of the partial needle body (104) and the plurality of extension blocks (102), the peripheral sides of the separator and the plurality of detection blocks (103) are provided with interconnected overflow grooves (101).

9. The bipolar internally cooled radiofrequency ablation needle capable of precise detection and positioning according to claim 8, characterized in that: The plurality of extension blocks (102) and the detection block (103) are twisted uniformly along the central axis of the outer needle tube (3).

10. The bipolar internally cooled radiofrequency ablation needle capable of precise detection and positioning according to claim 7, characterized in that: The separator is made of a metal conductor.

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