Radiofrequency ablation electrode needle with adjustable radiation zone length, system and method

Abstract

The present invention discloses a radiofrequency ablation electrode needle with adjustable radiation zone length, comprising a handle, a needle head, a needle body, and a tail spring; the needle head is made of metal material and is sleeved on the front end of the needle body; the needle body comprises an electrode radiating end, a non-metallic coating, and a tail spring; the expansion and contraction of the tail spring drives the needle body to move inside the needle head, and the length of the electrode radiating end relative to the needle head changes accordingly; a distance measuring sensor is provided in the handle. The present invention also discloses a radiofrequency ablation electrode system with adjustable radiation zone length, and a method for implementing a radiofrequency ablation electrode system with adjustable radiation zone length. The host-side system controls the movement of the needle body through the tail spring to achieve the adjustable function of the single-electrode precise ablation range, and the distance measuring sensor transmits the measured length information to the host-side system, which matches the length value to the optimal output mode to achieve an adjustable and precise ablation clinical effect.

Description

[0001] Cross-references to Related Patent Applications

[0002] This patent application claims the patent application CN filed on September 14, 2021 202111074027.1 priority, which The entire text is incorporated herein by reference Technical Field

[0003] The present invention relates to the technical field of medical devices, and in particular to a radiofrequency ablation electrode needle with adjustable radiation zone length, a system and a method. Background Art

[0004] A conventional radiofrequency ablation system mainly includes the following three components: the first is the radiofrequency power output host, which usually operates at a frequency of 400-500KHz and an output power ranging from 20W to 250W depending on application requirements; the second is the water pump, whose main function is to cool the application part of the electrode needle. In actual application, whether a cooling water circulation system is required depends on the specific application and power output; the third is the electrode needle, one end of which is connected to the radiofrequency power output host and the other end is placed directly at the patient's lesion location.

[0005] Existing radiofrequency ablation systems are implemented in different configurations, such as monopolar and multipolar, depending on the application scenario and the size of the ablation area. Traditional radiofrequency ablation systems typically utilize a single main unit equipped with multiple electrode models, each with varying exposed end lengths to achieve a different ablation range. In actual clinical applications, this approach typically requires two or more electrodes for ablation of two or more tumors in a single patient.

[0006] In actual clinical operations, there are few electrode needle designs with adjustable radiation zone lengths. It is impossible to achieve the surgical purpose of precise ablation through the design of the electrode needle itself without making corresponding adjustments to the system output. This is also the reason why adjustable electrodes cannot be used in actual clinical practice.

[0007] A Chinese invention patent (application publication number CN 107374726 A) discloses a radiofrequency ablation electrode needle with adjustable working length and a method for installation and use. The electrode needle includes a handle, a needle body, a slider and a sleeve. The slider and the sleeve are made of insulating material. According to the size of the tumor, the relative position of the sleeve and the needle body is changed by moving the slider, thereby achieving the purpose of adjusting the length of the working end of the electrode needle. By setting a variable resistor in the handle, the host obtains the length of the working end of the electrode needle by detecting the resistance value, and then matches different output powers. The difference between this device and the present invention is that the present invention changes the length of the exposed end through a spring mechanical device, uses a displacement sensor, or designs a voltage difference test device for the sliding part, and obtains the exposed length by measuring the voltage difference. The electrode needle of the present invention uses an electrode radiating end made of metal material, and the relative position of the needle head and the needle body is changed, and the connecting spring between the needle body and the handle is used to adjust the working length of the electrode. The design of the electrode needle is simpler and easy to operate. In addition, a distance measuring sensor is provided on the handle of the present invention. By measuring the distance, the system can obtain the size of the ablation area and match the corresponding power. The system can dynamically adjust the maximum peak output power, signal output mode (continuous or pulsed), and temperature or impedance feedback mode according to the size of the ablation range, so as to achieve customized output according to the size of the area to be ablated.

[0008] The PCT application (International Publication No. WO2020088140A1) discloses an ablation needle assembly and an ablation system, wherein the ablation needle assembly includes a hollow outer sleeve and an ablation needle, wherein the outer sleeve is movably mounted on the outside of the electrode needle body and is detachably connected to the ablation handle; the ablation system includes an ablation needle assembly, a radio frequency or microwave generator, and a cooling device. The difference between this device and the present invention is that the present invention changes the length of the exposed end through a spring mechanical device, adopts a displacement sensor, or designs a voltage difference testing device for a slidable part, and obtains the exposed length by measuring the voltage difference. The electrode needle needle of the present invention is sleeved on the outside of the needle body, and the needle body and the handle are non-detachably connected. The length of the radiation zone is adjusted by controlling the length of the needle body exiting the hollow cavity of the needle head, and a distance measuring sensor is provided at the handle. In addition, after receiving the length information, the ablation system of the present invention associates the length with the ablation range, converts the mechanical signal into an electrical signal, and converts the electrical signal into a digital signal output, thereby achieving precise ablation. The present invention is not only innovative in the electrode needle structure itself, the system can also dynamically adjust the maximum peak output power, signal output mode (continuous or pulsed), and temperature or impedance feedback mode according to the size of the ablation range, so that the system can customize the output according to the size of the ablation range. Summary of the Invention

[0009] In view of the above-mentioned defects of the prior art, the present invention provides a radiofrequency ablation electrode needle with adjustable radiation zone length; the present invention also provides a radiofrequency ablation system with adjustable radiation zone length; the present invention also provides a method for implementing a radiofrequency ablation electrode system with adjustable radiation zone length. The present invention can avoid the need to equip a single host with ablation electrodes of multiple models and different exposed end lengths during clinical application, simplify the operation, and achieve the purpose of system adjustment of electrodes to achieve precise ablation.

[0010] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0011] In the first aspect of the present invention, there is provided a radiofrequency ablation electrode needle with adjustable radiation zone length, comprising a handle, a needle head, a needle body, and a tail spring; the needle head is a hollow structure with a needle tip, which is sleeved on the front end of the needle body, and the needle head is made of metal material; the needle body includes an electrode radiating end located at the front end of the needle body, the electrode radiating end is made of metal material, the middle section of the needle body is wrapped with a non-metallic material coating, and the rear end of the needle body is provided with a tail spring; the expansion and contraction of the tail spring drives the needle body to move in the needle head, and the length of the electrode radiating end relative to the needle head changes accordingly; the rear end of the needle body is connected to the handle.

[0012] As a preferred technical solution of the present invention, the length of the electrode radiation end is the same as the length of the needle head. In this case, the length of the radiation zone can be adjusted as needed, and its maximum adjustable length is twice the original length.

[0013] As a preferred technical solution of the present invention, the rear end of the needle body extends into the handle and is non-detachably connected to the handle; a ranging sensor is provided on the inner wall of the handle at the connection with the rear end of the needle body. The ranging sensor can measure the relative position of the electrode radiation end and the needle tip in real time, and feed back the distance data to the host system in real time.

[0014] As a preferred technical solution of the present invention, the needle is further fixedly connected to the handle via a needle support rod;

[0015] The needle body is provided with a through hole which penetrates the needle body and allows the needle support rod to pass through.

[0016] In the second aspect of the present invention, a radiofrequency ablation electrode system with adjustable radiation zone length is provided, comprising the above-mentioned radiofrequency ablation electrode needle with adjustable radiation zone length and a generator, wherein the radiofrequency ablation electrode needle is connected to the generator via a connecting line, and a host-end system is provided in the generator, and the position data of the electrode radiating end is measured by the ranging sensor and then transmitted to the host-end system, and the host-end system receives the position data of the electrode radiating end measured by the ranging sensor, and calculates the size of the ablation range and outputs the ablation range through a preset built-in program in the host-end system.

[0017] As a preferred technical solution of the present invention, the host-side system outputs instructions to control the expansion and contraction of the tail spring, thereby adjusting the position of the electrode radiating end. Specifically, the host-side system controls the tail spring based on position data obtained by a program, thereby controlling the distance the electrode radiating end is exposed from the tail end of the needle through the expansion and contraction of the tail spring.

[0018] As a preferred technical solution of the present invention, the generator is provided with a display screen and an operation interface for the operator to view data and perform various operations.

[0019] As a preferred technical solution of the present invention, the radiofrequency ablation electrode needle is connected to the generator via a connecting wire.

[0020] In a third aspect of the present invention, a method for implementing the above-mentioned radiofrequency ablation electrode system with adjustable radiation zone length is provided, the method comprising the following steps:

[0021] Step 1: Connect the connecting wire of the electrode needle to the generator, start the generator, and start the host end system of the radiofrequency ablation motor with adjustable radiation zone length;

[0022] Step 2: the host system controls the tail spring according to the size of the ablation area, and the tail spring adjusts the position of the electrode radiation end by stretching and contracting, so that the length of the electrode radiation area changes;

[0023] Step 3: The ranging sensor obtains the position data of the electrode radiation end in real time and uploads it to the host system;

[0024] Step 4: After the position of the radiation end is determined, the host system calculates the output power according to the position data and performs ablation on the area to be ablated.

[0025] As a preferred technical solution of the present invention, in step 3, the host-side system is provided with an algorithm for converting mechanical signals into electrical signals and converting electrical signals into digital signals, thereby converting mechanical signals into electrical signals and converting electrical signals into digital signals.

[0026] As a preferred technical solution of the present invention, in step 2, the ablation area information matching the position data measured by the ranging sensor is displayed in real time on the generator display screen.

[0027] In a fourth aspect of the present invention, there is provided a radiofrequency ablation electrode needle with adjustable radiation zone length, comprising a handle, a needle head, a needle shaft, a needle body, and a tail spring;

[0028] The needle head and the needle rod are both made of metal, the front end of the needle body is the electrode radiation end, and the electrode radiation end is made of metal; the middle section and the rear section of the needle body are coated with a non-metallic material;

[0029] The rear end of the needle body is fixedly connected to the handle, and a through hole is provided in the needle body that penetrates the needle body;

[0030] The needle head is arranged at the front end of the needle rod, and the rear end of the needle rod passes through the through hole and is connected to the handle via the tail spring, and a guide groove is provided on the side wall of the needle body along the axial direction of the needle body, for a needle rod connector to pass through the guide groove from the outside of the needle rod and be connected to the needle rod located in the through hole of the needle body. The tail spring and the needle rod connector drive the needle rod to move telescopically relative to the needle body, and the length of the radiation area of ​​the electrode needle changes as the length of the needle rod extending out of the needle body changes.

[0031] As a preferred technical solution of the present invention, the rear end of the needle body extends into the handle and is non-detachably connected to the handle; a distance measuring sensor is provided on the inner wall of the handle at the connection with the rear end of the needle body to detect the position of the needle tip.

[0032] In the fifth aspect of the present invention, a radiofrequency ablation electrode system with adjustable radiation zone length is provided, comprising the above-mentioned radiofrequency ablation electrode needle with adjustable radiation zone length and a generator, wherein the radiofrequency ablation electrode needle is connected to the generator, and a host-end system is provided in the generator, and the host-end system receives the needle position data measured by a ranging sensor.

[0033] The advantages of this invention are: First, while using a single electrode, it can meet the needs of different ablation areas. Second, a distance-measuring sensor is designed on the handle, and the system converts mechanical signals into electrical signals, and the obtained electrical signals are converted into digital signals for output. Through this design, the system can associate the obtained signals with the ablation range, thereby achieving precise ablation. Third, the system can optimize the program algorithm according to the required ablation range, making the system safer and more reliable during use.

[0034] The concept, specific structure and technical effects of the present invention will be further described below in conjunction with the accompanying drawings to fully understand the purpose, characteristics and effects of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 3 is a schematic diagram of a first partial cross-sectional structure of the electrode needle in the first embodiment.

[0036] Figure 2 3 is a schematic diagram of a second partial cross-sectional structure of the electrode needle in the first embodiment.

[0037] Figure 3 for Figure 2 Schematic diagram of the state in which the electrode radiation end at the front end of the needle body of the radiofrequency ablation electrode needle is completely inside the needle head.

[0038] Figure 4 for Figure 2 Schematic diagram of the state when the electrode radiation end at the front end of the needle body of the radiofrequency ablation electrode needle extends out from the needle head.

[0039] Figure 5 This is a schematic diagram of the state of the radiofrequency ablation electrode needle in the second embodiment when the needle rod extends out of the needle body.

[0040] Figure 6 for Figure 5 A partial schematic diagram of the rear end of the middle needle body.

[0041] Figure 7 for Figure 5 Schematic diagram of the state when the needle shaft of the radiofrequency ablation electrode needle in the embodiment is completely retracted into the needle body.

[0042] Figure 8 for Figure 7 A partial schematic diagram of the rear end of the middle needle body.

[0043] The accompanying drawings are numerals as follows:

[0044] Needle 1, needle support rod 11, needle rod 12, needle body 2, electrode radiation end 21, non-metallic material coating 22, guide groove 23, needle rod connector 24, handle 3, generator 4, display screen 41, tail spring 5, and ranging sensor 6. DETAILED DESCRIPTION

[0045] In order to make the technical means, creative features, objectives and effects of the invention easier to understand, the invention is further described below with reference to specific diagrams. However, the invention is not limited to the following implementation cases.

[0046] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings in this specification are only used to match the contents disclosed in the specification so that people familiar with this technology can understand and read them. They are not used to limit the conditions under which the present invention can be implemented. Therefore, they have no substantive technical significance. Any modification of the structure, change in the proportion relationship or adjustment of the size should still fall within the scope of the technical content disclosed in the present invention without affecting the efficacy and purpose that can be achieved by the present invention.

[0047] First embodiment

[0048] like Figure 1 As shown, a radiofrequency ablation electrode needle with adjustable radiation zone length includes a needle head 1, a needle body 2, and a handle 3. The needle head 1 is a hollow structure with a needle tip at one end and an open end. The head of the needle body 2 is the electrode radiation end 21, and the middle section is a non-metallic material coating 22. The needle body 2 is inserted into the hollow structure of the needle head 1 from the open end of the needle head 1, and the needle body 2 is slidable within the needle head 1. The tail of the needle body 2 is non-detachably connected to the handle 3, and a distance sensor 6 is provided on the handle 3 near the tail of the needle body 2. One end of the tail spring 5 is connected to the tail of the needle body 2 and the other end is connected to the handle 3. The compression and extension of the tail spring 5 can drive the position of the needle body 2 relative to the needle head 1. The needle head 1 and the electrode radiation end 21 are both made of metal materials, and the length of the electrode radiation end 21 is the same as that of the needle head 1. Under the covering of the non-metallic material coating 22, other areas of the needle body 2 except the electrode radiation end 21 cannot achieve the ablation function.

[0049] in, Figure 1 In order to better reflect the structural relationship of various parts, the needle tip 1 is in a cross-sectional state.

[0050] like Figure 2 As shown (where Figure 2 In order to facilitate the reflection of the structural relationship of each part, the needle 1 and the needle body 2 are in a cross-sectional state). In this embodiment, the needle 1 is also fixedly connected to the handle through a needle support rod 11, wherein the needle body 2 is provided with a through hole penetrating the needle body, and the needle support rod 11 is provided in the through hole. This structural design not only fixes the relative position of the needle and the handle, but also enables the adjustment of the length of the radiation zone by moving the position of the needle body. The length of the needle support rod 11 needs to be longer than the length of the needle body. In other embodiments, other methods can also be used to fix the relative distance between the needle 1 and the handle 3, such as using an auxiliary external support mechanism to achieve the fixation of the relative position between the needle 1 and the handle 3.

[0051] The following combination Figure 3 and Figure 4 The extension and contraction state of the radiation area of ​​the radiofrequency ablation electrode needle in this embodiment is further described (due to Figure 3 and Figure 4 The figure only reflects the telescopic state, so the complete structure of the radiofrequency ablation electrode needle is not drawn. At the same time, in order to facilitate the reflection of the relative positions of the needle body, needle head and needle head support rod 11, the needle head is in a cross-sectional state in the figure. In actual application, the needle body and needle head support rod 11 located inside the needle head cannot be seen from the outside. At the same time, Figure 3 and Figure 4 It only reflects the relative position relationship among the various components and does not limit the specific shape of each structure):

[0052] like Figure 3 As shown, when the electrode needle is performing ablation, the needle 1 and the handle 3 are connected by the needle support rod 11, and the relative distance between the needle 1 and the handle 3 remains unchanged. When the radiation area is the shortest, the tail spring 5 is stretched, and the electrode radiation end 21 is completely inserted into the hollow structure of the needle 1. The length of the radiation area is only the length of the needle 1;

[0053] like Figure 4 As shown, when the electrode needle is performing ablation, the needle 1 and the handle 3 are connected by the needle support rod 11, and the relative distance between the needle 1 and the handle 3 remains unchanged. When the radiation area is the longest, the tail spring 5 is compressed, and the electrode radiation end 21 slides out of the hollow structure of the needle 1. At this time, the length of the radiation area is the length of the needle 1 plus the length of the electrode radiation end 21 extending from the needle.

[0054] A radiofrequency ablation system with an adjustable radiation zone length includes the radiofrequency ablation electrode needle with an adjustable radiation zone length and a generator 4. The electrode needle is connected to the generator 4 via a connecting line, and a display screen 41 is provided on the generator 4. A host system is provided within the generator 4. The distance sensor 6 transmits the measured position data of the needle body 2 to the host system via the connecting line. After processing by the built-in program, the system obtains the ablation area that matches the radiation length. By operating the operating interface provided on the generator, the operator can control the tail spring 5 connected to the handle 3, and change the position of the needle body 2 relative to the needle head 1 by compressing and stretching the tail spring 5.

[0055] The method of using the radiofrequency ablation electrode system in the above embodiment of the present invention is as follows:

[0056] Connect the electrode needle to the generator 4 through the connecting line, turn on the host system, and start the operation after the system passes the power-on self-test. The operator can determine the size of the area that needs to be ablated based on the preliminary diagnosis of the patient, and adjust the relative position of the needle 1 and the needle body 2 according to the size of the ablation area. When the electrode needle reaches the designated area, the operator starts to operate the generator 4, and the system issues a command to shrink the tail spring 5 connected to the handle 3, pulling the needle body 2 out from the inside of the needle 1, and the electrode radiating end 21 is exposed from under the wrapping of the needle 1. At this time, the electrode radiation length is the needle length plus the exposed length of the electrode radiating end. The ranging sensor 6 measures the position change of the needle body 2 in real time, obtains the exposed length of the electrode radiating end 21 and feeds it back to the system. The system matches the exposed length of the electrode radiating end 21 with the size of the ablation range through the built-in program. The operator only needs to make the needle body 2 stay in the appropriate position according to the size of the area to be ablated. After the position is determined, the system uses a set program to measure the exposed length of the electrode radiation end 21 and match different output powers according to the length value, thereby quantifying the output power of radiofrequency ablation, and then ablation can be performed on the ablation area according to the appropriate power.

[0057] In the present invention, the host system within the generator 4 correlates the distance traveled by the electrode radiating end 21 with the effective range of radiofrequency ablation. When the distance sensor 6 inputs the exposed length of the electrode radiating end 21 into the system, the system calculates the size of the ablation zone corresponding to that distance. Therefore, the operator only needs to know the size of the area to be ablated to determine the appropriate exposed length of the electrode radiating end 21.

[0058] When performing the above operation, the operator can manually drive the position of the needle body to adjust the expansion and contraction of the tail spring, thereby adjusting the position of the electrode radiation end.

[0059] Second embodiment

[0060] See Figures 4 to 8 As shown (since the structure of the handle in this embodiment is the same as that in the above embodiment, Figure 4 and Figure 8 The same structures as those in the first embodiment are not drawn. At the same time, in order to better understand the relationship between the various structures with those skilled in the art, Figures 4 to 8 The needle body is in a cross-sectional state, so the position of the needle shaft inside it can be seen). In the second embodiment, the radiofrequency ablation electrode needle with adjustable radiation zone length may further include a handle, a needle head, a needle shaft 12, a needle body and a tail spring;

[0061] The needle head 1 and the needle rod 12 are both made of metal (in specific implementation, the needle head 1 and the needle rod 12 can be an integrated structure or a combination of separate structures). The front end of the needle body is the electrode radiation end 21, and the electrode radiation end 21 is made of metal material; the middle section and the rear section of the needle body are coated with a non-metallic material.

[0062] The rear end of the needle body is fixedly connected to the handle, and a through hole is provided in the needle body that penetrates the needle body;

[0063] The needle head is arranged at the front end of the needle rod 12, and the rear end of the needle rod 12 passes through the through hole and is connected to the handle through the tail spring, and a guide groove 23 is provided at the side wall of the needle body along the axial direction of the needle body, for a needle rod connector 24 to pass through the guide groove from the outside of the needle rod 12 and be connected to the needle rod 12 located in the through hole of the needle body. The tail spring and the needle rod connector 24 drive the needle rod 12 to move telescopically relative to the needle body, and the length of the radiation area of ​​the electrode needle changes as the length of the needle rod 12 extending out of the needle body changes.

[0064] In this embodiment, the rear end of the needle body extends into the handle and is non-detachably connected to the handle; a distance measuring sensor 6 is provided on the inner wall of the handle at the connection with the rear end of the needle body to detect the position of the needle tip.

[0065] The radiofrequency ablation electrode system capable of adjusting the length of the radiation zone during implementation may also include Figure 5 and Figure 8 In the embodiment of the present invention, the RF ablation electrode needle and the generator 4 are connected to the generator 4. The generator 4 is provided with a host system, which receives the needle position data measured by the ranging sensor 6. The generator 4 is provided with a display screen 41 and an operation interface.

[0066] During implementation, the user can control the extension and retraction of the tail spring, adjust the position of the needle and the length of the needle rod 12 extending out of the needle body, and thus adjust the length of the radiation zone according to the output instructions displayed by the host system on the display screen 41 (wherein the output instructions may include ablation area data) and the needle position data measured by the ranging sensor 6.

[0067] like Figure 5 and Figure 6 As shown, when the electrode needle is performing ablation and the radiation area is the longest, the tail spring 5 is stretched, and the needle head 1 and the needle rod 12 extend from the through hole of the needle body. At this time, the length of the radiation area is the length of the needle head 1 and the needle rod 12 extending from the needle body plus the length of the electrode radiation end 21.

[0068] like Figure 7 and Figure 8As shown, when the electrode needle is performing ablation and the radiation area is the shortest, the tail spring 5 contracts, the needle rod 12 is completely contracted in the through hole of the needle body, and only the needle head extends from the through hole of the needle body. At this time, the length of the radiation area is the length of the needle head 1 plus the length of the electrode radiation end 21.

[0069] During operation, the operator can adjust the position of the needle bar connector 24 in the guide groove 23 to adjust the telescopic length of the needle bar 12. Figure 5 and Figure 7 As shown, in this embodiment, the guide groove 23 is located at the rear end of the needle body 2, and a limiting groove is also provided at one end of the guide groove 23 close to the handle, which can limit the needle rod connector 24 in the limiting groove, thereby shrinking the needle rod 12 inside the needle rod 12.

[0070] In this embodiment, a tail spring is provided in the electrode needle so that the needle tip has a forward thrust. During operation, the operator only needs to provide a backward pulling force to adjust the length of the radiation zone, making the adjustment process more labor-saving.

[0071] The present invention improves the structure of the radiofrequency electrode so that the length of the radiation zone can be adjusted as needed, and its maximum adjustable length is twice the original length. The present invention sets a distance sensor 6 at the handle 3. When the operator adjusts the electrode to the position required for the ablation range, the distance sensor 6 will obtain the length of the electrode radiation zone. The system can associate this length with the range to be ablated, and store this information in the system for setting, and then perform ablation. The system provided by the present invention is suitable for scenarios of multiple ablations of a single lesion and multi-point ablation of a single patient, which can greatly reduce the surgical responsibility and reduce the economic cost of the patient.

[0072] The preferred embodiments of the present invention have been described in detail above. It should be understood that numerous modifications and variations based on the concepts of the present invention are possible without inventive effort by those skilled in the art. Therefore, any technical solution that can be derived by one skilled in the art through logical analysis, reasoning, or limited experimentation based on the concepts of the present invention and the prior art should be within the scope of protection defined by the claims.

Claims

1. A radiofrequency ablation electrode needle with adjustable radiation zone length, characterized in that: The needle comprises a handle, a needle head, a needle body, and a tail spring; the needle head is a hollow structure with a needle tip, which is sleeved on the front end of the needle body, and the needle head is made of metal; the front end of the needle body is an electrode radiating end, and the electrode radiating end is made of metal; the middle section of the needle body is coated with a non-metallic material, and the rear end of the needle body is provided with a tail spring, the expansion and contraction of the tail spring drives the needle body to move within the needle head, and the length of the electrode radiating end relative to the needle head changes accordingly; the rear end of the needle body is connected to the handle; The rear end of the needle body extends into the handle and is non-detachably connected to the handle; a distance measuring sensor is provided on the inner wall of the handle at the connection with the rear end of the needle body; The needle is also fixedly connected to the handle via a needle support rod; The needle body is provided with a through hole which penetrates the needle body and allows the needle support rod to pass through.

2. The radiofrequency ablation electrode needle with adjustable radiation zone length according to claim 1, characterized in that: The length of the electrode radiation end is the same as the length of the needle.

3. A radiofrequency ablation electrode system with adjustable radiation zone length, characterized in that: It comprises a radiofrequency ablation electrode needle with adjustable radiation zone length and a generator as described in claim 1 or 2, wherein the radiofrequency ablation electrode needle is connected to the generator, and a host-end system is provided in the generator. The host-end system receives the electrode radiation end position data measured by a ranging sensor and outputs the ablation range through a built-in program.

4. The radiofrequency ablation electrode system with adjustable radiation zone length according to claim 3, characterized in that: The host-side system outputs instructions to control the expansion and contraction of the tail spring and adjust the position of the electrode radiation end.

5. The radiofrequency ablation electrode system with adjustable radiation zone length according to claim 4, characterized in that: The generator is provided with a display screen and an operation interface.

6. The radiofrequency ablation electrode system with adjustable radiation zone length according to claim 3, characterized in that: The radiofrequency ablation electrode needle is connected to the generator via a connecting wire.

7. A radiofrequency ablation electrode needle with adjustable radiation zone length, characterized in that: It includes a handle, a needle, a needle rod, a needle body and a tail spring; The needle head and the needle rod are both made of metal, the front end of the needle body is the electrode radiation end, and the electrode radiation end is made of metal; the middle section and the rear section of the needle body are coated with a non-metallic material, and the needle head and the needle rod are an integrated structure; The rear end of the needle body is fixedly connected to the handle, and a through hole is provided in the needle body that penetrates the needle body; The needle head is provided at the front end of the needle rod, the rear end of the needle rod passes through the through hole and is connected to the handle via the tail spring, and a guide groove is provided on the side wall of the needle body along the axial direction of the needle body, for a needle rod connector to pass through the guide groove from the outside of the needle rod and connect with the needle rod located in the through hole of the needle body, the tail spring and the needle rod connector drive the needle rod to telescopically move relative to the needle body, and the length of the radiation area of ​​the electrode needle changes as the length of the needle rod extending out of the needle body changes; The rear end of the needle body extends into the handle and is non-detachably connected to the handle; a distance measuring sensor is provided on the inner wall of the handle at the connection with the rear end of the needle body to detect the position of the needle.

8. A radiofrequency ablation electrode system with adjustable radiation zone length, characterized in that: It comprises a radiofrequency ablation electrode needle with adjustable radiation zone length and a generator as described in claim 7, wherein the radiofrequency ablation electrode needle is connected to the generator, and a host-end system is provided in the generator, and the host-end system receives the needle position data measured by a ranging sensor.

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