Bipolar inner-cooled radiofrequency ablation needle with accurate detection and positioning

Abstract

The present application relates to the technical field of medical equipment, and particularly relates to a bipolar inner-cooling radiofrequency ablation needle capable of accurate detection and positioning. First, an operator inserts a needle body into a lesion tissue, then flows cooling liquid into the gap between the inner tube and the negative electrode connecting tube through the water inlet pipe for cooling, and simultaneously starts the positive electrode radiofrequency connecting wire and the negative electrode radiofrequency connecting wire to measure the inductive resistance value between the needle tip and the outer needle tube, judges whether the area where the needle head is located reaches the working range for positioning, after the positioning is completed, utilizes the radiofrequency wire to transmit energy to the needle tip and the outer needle tube working area for radiofrequency ablation, and in this period, the temperature control probe on the temperature measuring connecting wire senses the temperature of the needle tip for auxiliary temperature control to prevent overheating. The equipment has the advantages of simple structure, effective utilization of the change of the resistance value between tissues to realize the positioning of the needle tip, simultaneous realization of radiofrequency temperature control and ablation, good stability and practicability, and is beneficial to the popularization and use of the equipment.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of medical equipment, and particularly relates to a bipolar inner-cooling radiofrequency ablation needle capable of accurate detection and positioning. BACKGROUND

[0002] At present, most of the existing ablation needles on the market are single-pole inner-cooling structures, and are mostly used for the treatment of tumor diseases, and lack of equipment for dealing with varicose vein complications, i.e. vein blood vessels with blood tissue. The single-pole ablation needle needs to be used in cooperation with a negative plate, and puncture and ablation treatment is completed under the guidance of ultrasound. Since the needle tip working area is observed by ultrasonic principle of an ultrasonic probe, the ultrasonic imaging effect of the needle body is poor for puncture operation of different diseases and different tissues, and a product capable of assisting in identification and positioning and realizing radiofrequency ablation without a negative plate is needed. SUMMARY

[0003] In order to solve the above problems existing in the prior art, the present application aims to provide a bipolar inner-cooling radiofrequency ablation needle capable of accurate detection and positioning, which can realize accurate positioning for puncture operation of different diseases and different tissues and can realize ablation operation without a negative plate.

[0004] The technical scheme adopted by the present application is as follows: a bipolar inner-cooling radiofrequency ablation needle capable of accurate detection and positioning, comprising a needle tip, a negative connection pipe being arranged in the middle of the needle tip, an outer needle pipe being sleeved on the periphery of the negative connection pipe, an insulating ring being arranged between the needle tip and the outer needle pipe, an inner pipe being arranged in the inner cavity of the negative connection pipe, a water inlet pipe being connected to the end of the inner pipe away from the needle tip, a flow divider being arranged at the end of the negative connection pipe away from the needle tip, a water outlet pipe being arranged on the flow divider, the inner pipe penetrating through the flow divider, a negative radiofrequency connection line being arranged on the needle tip, a positive radiofrequency connection line being arranged on the outer needle pipe, the positive radiofrequency connection line and the negative radiofrequency connection line being connected to one end away from the connection point and connected to a radiofrequency line, and the radiofrequency line being connected to a radiofrequency generating device.

[0005] In an embodiment, a temperature measurement connection line is arranged in the inner cavity of the inner pipe, a temperature control probe is arranged at one end of the temperature measurement connection line close to the needle tip, the temperature measurement connection line is connected to a monitoring device, and the monitoring device acquires 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 an embodiment, an inner layer insulating pipe is arranged between the negative connection pipe and the outer needle pipe, and the inner layer insulating pipe abuts against the needle tip.

[0007] In an embodiment, an outer layer insulating sleeve pipe is sleeved on the outer side of the outer needle pipe, the outer layer insulating sleeve pipe is fixedly sleeved on the outer needle pipe, and a positioner is arranged at the end of the outer layer insulating sleeve pipe away from the needle tip.

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

[0009] In an 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 intersection point of the insulating ring.

[0010] In an embodiment, the needle tip comprises a plurality of part needle bodies, the insulating ring comprises a plurality of partition bodies, the part needle bodies and the partition bodies have the same conical body structure, the part needle bodies and the partition bodies are combined into a conical body in an alternating ring array, a plurality of extension blocks are arranged between the part needle bodies and the outer needle tube, a plurality of detection blocks are arranged between the partition bodies and the outer needle tube, the abutting positions between the extension blocks and the outer needle tube, the abutting surfaces of the part needle bodies and the partition bodies, and the abutting positions between the extension blocks and the detection blocks are filled with insulating glue.

[0011] In an embodiment, the part needle bodies and the extension blocks, and the partition bodies and the detection blocks are provided with a communicating overflow groove on the outer peripheral side.

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

[0013] In an embodiment, the partition body is made of a metal conductor.

[0014] The present application has the following advantages: the present application can achieve precise positioning for different diseases and different tissues, and can realize precise detection and positioning for ablation operation without a negative plate.

[0015] The operator first introduces liquid into the inner tube through the water inlet pipe, and then the liquid continues to flow into the flow divider through the gap between the inner tube and the negative electrode connecting pipe, the flow divider is a sealed cavity, mainly realizing the buffering of the liquid, and then the liquid in the flow divider flows out through the water outlet pipe, and the flow control of the water outlet pipe and the water inlet pipe can realize the temperature control of the needle tip and the outer needle tube, and cooperate with the temperature control probe in the inner tube to effectively realize accurate temperature control, prevent the phenomenon of scabbing and carbonization of tissue due to high tissue impedance during treatment. At the same time, due to the different resistance values between different tissues, the negative electrode connecting pipe on the needle tip is connected by the negative electrode radio frequency connecting line, and the outer needle tube is connected by the positive electrode radio frequency connecting line, a loop is formed by the tissue adhering to the needle tip and the outer needle tube, the resistance values of different tissues are transmitted to the radio frequency generator matched therewith, the radio frequency generator converts the resistance value collected by the needle tip into a digital signal to present to the user, and the user determines the specific puncture position of the needle tip working part according to the converted digital signal, and when reaching the treatment position, the radio frequency generator is started, the radio frequency energy is transmitted to the needle tip working area of the radio frequency ablation needle through the radio frequency line, and a high-frequency electric field is formed in the electrode covering area tissue through the outer needle tube connected by the positive electrode radio frequency connecting line and the needle tip connected by the negative electrode radio frequency connecting line, so as to make the conductive ions and polarized molecules of the tissue cells run, oscillate and rub at high speed to generate heat, and a spherical or ellipsoidal heat zone is generated at the front end of the ablation needle to perform surgical treatment. The present application solves the problem of poor ultrasonic imaging effect, greatly improves the treatment efficiency of the operation;

[0016] At the same time, in the actual use process, the distance between different tissues is small, and various tissues are easily punctured in the area from the needle to the outer needle tube, so it is difficult to actually determine the area change, at this time, a needle head with a needle tip and an outer needle tube in a form of relative inclined surface is provided, when puncturing to a single tissue plane, the needle tip and the outer needle tube are arranged, even if puncturing to a complex area, the resistance measurement of different layered tissues can still be realized, the positioning accuracy is effectively improved, and in the puncture process, part of the cell tissue liquid adheres to the periphery of the needle body, and the tissue liquid is guided into the overflow groove by using the tension of the tissue to press and cooperate with the overflow groove, so that the outer side of the needle body directly adheres to the tissue, and the detection accuracy is effectively improved.

[0017] At the same time, in order to realize the positioning of the needle head with deep depth, the needle tip is divided into multiple parts, so that part of the needle body and the separation body are alternately connected, and the separation body and the outer needle tube are connected through the detection block, and the positive and negative electrodes of the detection resistance are arranged on the plane of different position tissues, if high-depth detection is required, multiple extension blocks and detection blocks can be added, at the same time, the tissue liquid is guided into the overflow groove by using the tension of the tissue to press and cooperate with the overflow groove, so that the outer side of the needle body directly adheres to the tissue, and the detection resistance value accuracy is effectively improved.

[0018] The device has simple structure, and the position and depth of the puncture part are positioned by detecting the resistance change between the needle tip and the outer needle tube, so that the ablation needle is effectively assisted to perform treatment, meanwhile, the ablation operation can be performed without negative plate, and the device has good stability and practicality, and is beneficial to popularization and use of the device. BRIEF DESCRIPTION OF DRAWINGS

[0019] The application will be described in further detail below in combination with the drawings and specific implementation methods.

[0020] Figure 1 is a schematic diagram of the planar structure of the application;

[0021] Figure 2 is a schematic diagram of the partial exploded perspective structure of the application;

[0022] Figure 3 is a schematic diagram of the cross-sectional structure of the needle tip of the application;

[0023] Figure 4 is a schematic diagram of the second needle tip perspective structure of the application;

[0024] Figure 5 is a schematic diagram of the second needle tip cross-sectional perspective structure of the application;

[0025] Figure 6 is a schematic diagram of the third needle tip perspective structure of the application;

[0026] Figure 7 is a schematic diagram of the third needle tip cross-sectional perspective structure of the application.

[0027] BRIEF DESCRIPTION OF DRAWINGS: 1, needle tip; 101, overflow groove; 102, extension block; 103, detection block; 104, part of needle body; 2, insulating ring; 201, separation body; 3, outer needle tube; 4, outer insulating sleeve; 5, positioner; 6, handle; 7, radio frequency wire; 8, water outlet pipe; 9, water inlet pipe; 10, temperature control probe; 11, inner tube; 12, negative electrode connecting pipe; 13, inner insulating pipe; 14, shunt; 16, positive electrode radio frequency connecting wire; 17, negative electrode radio frequency connecting wire; 18, temperature measurement connecting wire. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical scheme and advantages of the application more clear, the application will be further described in detail below in combination with the drawings and examples. It should be understood that the specific examples described herein are only used to explain the application, and are not used to limit the application, that is, the described examples are only a part of the examples of the application, but not all the examples. The components of the application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0029] 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.

[0030] The following combination Figures 1-7 The specific embodiment of the present invention is described:

[0031] 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.

[0032] 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.

[0033] 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.

[0034] The connection of the equipment separated from the working section is fixed by a handle 6 to prevent harm to the user.

[0035] 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.

[0036] 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.

[0037] Reference Figure 6 、 7As shown, in Example Three, on the basis of Example One, the needle tip 1 comprises a plurality of partial needle bodies 104, the insulating ring 2 comprises a plurality of separators, the partial needle bodies 104 and the separators are in the same shape of the equal division cone structure, the needle head is divided into a plurality of parts, and the parts are separated by the separators, the separators are made of metal conductors, so that the needle tip 1 can also realize the change detection of the resistance value, improve the accuracy of the equipment, the partial needle bodies 104 and the extension blocks 102 on the needle tip 1 can be connected through the negative radio frequency connecting line 17, the positive radio frequency connecting line 16 is connected with the separators and the detection blocks 103, the real-time resistance detection at different heights of the needle body is realized, the detection range is prolonged, the detection area with high depth is effectively coped with, the plurality of partial needle bodies 104 and the separators are alternately combined into a cone in the form of an annular array, a plurality of extension blocks 102 are arranged between the partial needle bodies 104 and the outer needle tube 3, a plurality of detection blocks 103 are arranged between the separators and the outer needle tube 3, the number is determined according to the actual use length, the abutting position between the extension blocks 102 and the outer needle tube 3, the abutting surface of the partial needle bodies 104 and the separators, and the abutting position between the extension blocks 102 and the detection blocks 103 are filled with insulating glue, the overflow groove 101 is arranged on the peripheral side of the partial needle bodies 104 and the plurality of extension blocks 102 and the peripheral side of the separators and the plurality of detection blocks 103, and the overflow groove 101 is connected, the tissue liquid is guided into the overflow groove 101 by using the tension of the tissue to press fit the overflow groove 101, so that the needle body is directly attached to the tissue outside, and the accuracy of the detection resistance value is effectively improved.

[0038] At the same time, the plurality of extension blocks 102 and the detection blocks 103 are uniformly twisted along the central axis of the outer needle tube 3, and the uniform arrangement prevents the needle body from being inserted too deep, so that the tissue cells are stacked in the overflow groove 101, the tissue liquid is precipitated into the gap between the needle bodies, and the resistance detection change between the extension blocks 102 and the detection blocks 103 is affected.

[0039] Working principle of the application:

[0040] The operator first introduces liquid into the inner tube 11 by the water inlet pipe 9, and then the liquid continues to flow into the flow divider 14 through the gap between the inner tube 11 and the negative electrode connecting pipe 12. The flow divider 14 is a sealed cavity, which mainly realizes the buffering of the liquid. Then the liquid in the flow divider 14 flows out through the water outlet pipe 8. By controlling the flow of the water outlet pipe 8 and the water inlet pipe 9, the temperature control effect of the needle tip 1 and the outer needle tube 3 can be realized. In combination with the temperature control probe 10 in the inner tube 11, accurate temperature control can be realized, and the phenomenon of tissue impedance being too high and scabbing and carbonizing during treatment is prevented. At the same time, due to the different resistance values between different tissues, the negative electrode radio frequency connecting line 17 is connected to the negative electrode connecting pipe 12 on the needle tip 1, and the positive electrode radio frequency connecting line 16 is connected to the outer needle tube 3. A loop is generated by the tissues attached to the needle tip 1 and the outer needle tube 3, and the resistance values of different tissues are transmitted to the radio frequency generator adapted thereto. The radio frequency generator converts the resistance value collected by the needle tip 1 into a digital signal to present to the user. The user determines the specific puncture position of the working part of the needle tip 1 according to the converted digital signal. When the treatment position is reached, the radio frequency generator is started. The radio frequency energy is transmitted to the working area of the needle tip 1 of the radio frequency ablation needle through the radio frequency line 7. A high-frequency electric field is formed in the tissue covered by the electrode by the outer needle tube 3 connected by the positive electrode radio frequency connecting line 16 and the needle tip 1 connected by the negative electrode radio frequency connecting line 17. The high-speed operation, oscillation and friction of the conductive ions and polar molecules of the tissue cells generate heat, and a spherical or ellipsoidal heat zone is generated at the front end of the ablation needle to perform surgical treatment. The present application solves the problem of poor ultrasonic imaging effect, and greatly improves the treatment efficiency of the operation;

[0041] At the same time, in the actual use process, the distance between different tissues is small, and various tissues are easily punctured in the region from the needle to the outer needle tube 3, and the region change cannot be actually distinguished. At this time, a needle head in which the needle tip 1 and the outer needle tube 3 are relatively inclined is provided. When puncturing a single tissue plane, the needle tip 1 and the outer needle tube 3 are arranged. Even if puncturing a complex region, the resistance measurement of different layered tissues can still be realized, and the positioning accuracy is effectively improved. During the puncture process, part of the cell tissue liquid is attached to the periphery of the needle body. By using the tension of the tissue to press and cooperate with the overflow groove 101 to guide the tissue liquid into the overflow groove 101, the outer side of the needle body is directly attached to the tissue, and the detection accuracy is effectively improved.

[0042] Meanwhile, in order to realize the positioning of the needle with deep depth, the needle tip 1 is divided into multiple parts, so that the partial needle body 104 and the partition body are connected alternately, and the partition body and the outer needle tube 3 are connected through the detection block 103, the positive and negative electrodes of the detection resistance are arranged on the planes of different positions, if high depth detection is needed, more extension blocks 102 and detection blocks 103 can be added, at the same time, the tissue liquid is guided into the overflow groove 101 by using the tension of the tissue to press the overflow groove 101, so that the outer side of the needle body directly adheres to the tissue, and the accuracy of the detection resistance value is effectively improved.

[0043] In the description of the present application, it should be noted that, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0044] The above is only an example and description of the structure of the present application, and those skilled in the art of the present application can make various modifications or supplements to the described specific embodiments or use similar ways to replace, as long as it does not deviate from the structure of the invention or exceed the scope defined by the present claims, it shall belong to the protection scope of the present application.

Claims

1. A bipolar inner-cooled radiofrequency ablation needle with accurate detection and positioning, characterized in that: The application relates to a needle tip (1) provided with a negative electrode connecting pipe (12) in the middle, an outer needle pipe (3) sleeved on the outer periphery of the negative electrode connecting pipe (12), an insulating ring (2) arranged between the needle tip (1) and the outer needle pipe (3), an inner pipe (11) arranged in the inner cavity of the negative electrode connecting pipe (12), a water inlet pipe (9) connected to the end of the inner pipe (11) away from the needle tip (1), a shunt (14) arranged at the end of the negative electrode connecting pipe (12) away from the needle tip (1), a water outlet pipe (8) arranged on the shunt (14), the inner pipe (11) penetrating through the shunt (14), a negative electrode radio frequency connecting wire (17) arranged on the needle tip (1), a positive electrode radio frequency connecting wire (16) arranged on the outer needle pipe (3), the positive electrode radio frequency connecting wire (16) and the negative electrode radio frequency connecting wire (17) being connected to a radio frequency wire (7) at the end away from the connecting point, and the radio frequency wire (7) being connected to a radio frequency generating device. The end face of the outer needle pipe (3) close to the needle tip (1) is inclined, the end face of the needle tip (1) close to the outer needle pipe (3) is parallel to the inclined end face of the outer needle pipe (3), the needle tip (1), the insulating ring (2) and the outer periphery of the outer needle pipe (3) are provided with a communication overflow groove (101), and the surface of the overflow groove (101) is coated with an insulating material.

2. The precisely probe-locatable bipolar internally-cooled RF ablation needle according to claim 1, wherein: The inner cavity of the inner pipe (11) is provided with a temperature measuring connecting wire (18), one end of the temperature measuring connecting wire (18) close to the needle tip (1) is provided with a temperature control probe (10), the temperature measuring connecting wire (18) is connected to a monitoring device, 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).

3. The precisely probe-locatable bipolar internally-cooled RF ablation needle of claim 1, wherein: The negative electrode connecting pipe (12) and the outer needle pipe (3) are provided with an inner layer insulating pipe (13) abutting against the needle tip (1).

4. The precisely probe-locatable bipolar internally-cooled RF ablation needle of claim 1, wherein: The outer side of the outer needle pipe (3) is sleeved with an outer layer insulating sleeve (4), the outer layer insulating sleeve (4) is fixedly sleeved and connected to the outer needle pipe (3), and the end of the outer layer insulating sleeve (4) away from the needle tip (1) is provided with a positioner (5).

5. The precisely probe-locatable bipolar internally-cooled RF ablation needle of claim 1, wherein: The overflow groove (101) is a spiral groove structure, the spiral progressive direction of the overflow groove (101) is perpendicular to the tangent slope direction at the intersection of the insulating ring (2).

6. The precisely probe-locatable bipolar internally-cooled RF ablation needle of claim 1, wherein: The needle tip (1) comprises a plurality of partial needle bodies (104), the insulating ring (2) comprises a plurality of separation bodies, the partial needle bodies (104) and the separation bodies have the same conical body structure, a plurality of the partial needle bodies (104) and the separation bodies are alternately arranged in a conical body in a ring type array, a plurality of extension blocks (102) are arranged between the partial needle bodies (104) and the outer needle pipe (3), a plurality of detection blocks (103) are arranged between the separation bodies and the outer needle pipe (3), and the abutting positions between the extension blocks (102) and the outer needle pipe (3), the abutting surfaces of the partial needle bodies (104) and the separation bodies and the abutting positions between the extension blocks (102) and the detection blocks (103) are filled with insulating glue.

7. The precisely probe-locatable bipolar internally-cooled RF ablation needle of claim 6, wherein: The partial needle body (104) and the periphery of the plurality of extension blocks (102) are provided with a communication overflow groove (101) on the periphery of the plurality of separation bodies and the plurality of detection blocks (103).

8. The precisely probe-locatable bipolar internally-cooled RF ablation needle of claim 7, wherein: The plurality of extension blocks (102) and the detection blocks (103) are uniformly twisted along the central axis of the outer needle tube (3).

9. The precisely probe-locatable bipolar internally-cooled RF ablation needle of claim 6, wherein: The separation body is made of a metal conductor.

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