Radio frequency positioning needle

Abstract

The application belongs to the technical field of medical devices, and particularly relates to a radio frequency positioning needle, which comprises an outer needle rod, one end of the outer needle rod is fixed with an operating handle, one end of the operating handle is slidably connected with a push rod, one end of the push rod close to the outer needle rod is fixed with an inner needle rod, and further comprises a fixing base which is detachably assembled at one end of the inner needle rod, and a puncture positioning needle which is assembled at one end of the fixing base. The puncture positioning needle is driven to penetrate into the target tissue by pushing the push rod, radio frequency energy is supplied to the puncture positioning needle, local ablation is performed on the target tissue by the puncture positioning needle, the target tissue is guaranteed to be heat coagulated without bleeding and diffusion, meanwhile, the outer diameter of the puncture positioning needle and the size of the ablation area can be accurately controlled and identified by cooperation of the operating handle, the push rod and the scale line, so that the device is suitable for target tissues of different sizes.

Description

Technical Field

[0001] The present invention belongs to the technical field of medical devices, and in particular relates to a radio frequency positioning needle. Background Art

[0002] With the development of imaging diagnostic technology, the discovery of early tissue lesions has become increasingly easier and earlier, and the detection rate of small tumors requiring surgical treatment has also become easier and easier (for example, when removing lung lesions less than 1 cm in size, preoperative localization is generally performed, that is, small lung nodules are located through percutaneous puncture under CT guidance). Preoperative localization often uses a positioning needle, and a metal wire with a positioning hook at the end serves as a positioning anchor. Currently, preoperative localization is generally achieved through percutaneous puncture under CT guidance. Common positioning materials include metal materials (hook wire, spiral wire, micro coil), and the most commonly used product is a metal wire with a positioning hook at the end (Hook-wire), whose positioning hook can be fixed to the tumor.

[0003] The structure of the traditional positioning needle can refer to a new type of lung tumor positioning needle disclosed in the authorization publication number CN204863412U (hereinafter referred to as the "referenced patent"). The positioning needle disclosed in the referenced patent is composed of a puncture needle, an anchoring positioning needle, a positioning wire and a pushing device. The pushing device includes a push tube and a push tube handle. The push tube is placed in the puncture needle sleeve, the distal end of the push tube is against the proximal end of the anchoring positioning needle, the distal end of the positioning wire is connected to the proximal end of the anchoring positioning needle, and the positioning wire extends from the inside of the lumen of the push tube to the outside of the pushing device. The positioning needle has the functions of determining the location of the lesion and measuring the depth of the lesion.

[0004] Traditional positioning needles can only produce a good positioning effect in actual use, which makes it easier for doctors to quickly find diseased tissues. However, there are also some shortcomings. When the diseased tissue is a malignant tumor, the positioning needle punctures it, causing bleeding at the malignant tumor and the spread of the disease to normal tissues. Or, during the normal resection process, the malignant tumor cannot be coagulated, and it cannot be guaranteed that the malignant tumor will coagulate without bleeding or spreading. Therefore, when traditional positioning needles are used to locate malignant tumors, there is a hidden danger of causing medical accidents. Summary of the Invention

[0005] The purpose of the present invention is to provide a radiofrequency positioning needle, which drives the puncture positioning needle to penetrate the target tissue by pushing the push rod, transmits radiofrequency energy to the puncture positioning needle, and performs local ablation on the target tissue through the puncture positioning needle, ensuring that the target tissue is heated and coagulated without bleeding or spreading. At the same time, through the cooperation of the operating handle, the push rod and the scale line, the outer diameter of the puncture positioning needle and the size of the ablation area can be accurately controlled and identified, so that the device is suitable for target tissues of different sizes.

[0006] The technical solutions adopted by the present invention are as follows:

[0007] A radio frequency positioning needle, comprising an outer needle rod, an operating handle fixed to one end outside the outer needle rod, a push rod slidably connected to one end inside the operating handle, an inner needle rod fixed to one end of the push rod close to the outer needle rod, and further comprising:

[0008] A fixed base, the fixed base being detachably assembled on one end of the inner needle rod;

[0009] A puncture positioning needle is assembled on one end of a fixed base and is composed of a plurality of puncture rods fixedly connected to each other;

[0010] Among them, radio frequency energy is transmitted to the inner needle rod, and an ablation electric field is formed around the puncture positioning needle. In the working state, the puncture positioning needle composed of multiple puncture rods is radial, and the central axis of the puncture rod is in the shape of an outward curved arc curve.

[0011] In a preferred embodiment, a hollow guide tube is fixed to the inner wall of the outer needle rod, the fixed base and the hollow guide tube are slidably connected, and the inner wall cross-sectional shape of the hollow guide tube and the outer cross-sectional shape of the fixed base are both non-circular.

[0012] In a preferred embodiment, the hollow guide tube is made of one of the following materials: PTFE, PFA or other polymer insulating materials.

[0013] In a preferred embodiment, a plurality of scale lines are evenly arranged on the outer side of the push rod, and the scale lines are matched with the operating handle.

[0014] In a preferred embodiment, in the working state, the moving distance of the push rod relative to the operating handle is recorded as L, the outer diameter of the radial puncture positioning needle is recorded as R, and L=MR, wherein M is a constant.

[0015] In a preferred embodiment, an injection tube and a cable are fixed to the end of the push rod away from the operating handle, and the cable is connected to the inner needle rod, the push rod, the inner needle rod, the fixed base and the puncture positioning needle are all hollow structures, and a cooling passage is formed between the push rod, the inner needle rod, the fixed base, the puncture positioning needle and the injection tube, wherein the end of the injection tube away from the push rod is the input end of the cooling passage, and the end of the puncture positioning needle away from the inner needle rod is the output end of the cooling passage.

[0016] In a preferred embodiment, a positioning line is fixed on the fixed base at one end away from the puncture positioning needle and between the inner needle rod and the hollow guide tube, and the positioning line extends to the outside of the operating handle at one end away from the fixed base.

[0017] In a preferred solution, the material of the positioning line is one of the following: nylon, medical suture.

[0018] The present application has the following technical effects:

[0019] The present application can ensure that the target tissue is not bleeding and spreading when being positioned, and can eliminate the hidden danger of causing medical accidents and improve the safety factor of the operation.

[0020] The present application can accurately control and identify the outer diameter of the puncture positioning needle and the size of the ablation area by setting multiple scale lines on the surface of the push rod, and can make the device suitable for target tissues of different sizes and improve the application range of the device. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 is a structural schematic diagram of the whole application;

[0022] Figure 2 is a sectional view of the internal structure of the operating handle of the present application;

[0023] Figure 3 is a local enlarged schematic diagram of A in the present application; Figure 2

[0024] Figure 4 is a schematic diagram of the working state of the puncture positioning needle of the present application.

[0025] In the drawings, the components represented by each reference numeral are listed as follows:

[0026] 10, outer needle rod; 11, operating handle; 12, push rod; 13, inner needle rod; 14, fixed base; 15, puncture positioning needle; 16, hollow guide tube; 17, injection tube; 18, cable; 19, positioning line. DETAILED DESCRIPTION

[0027] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific embodiments of the present application will be described in detail below with reference to the drawings.

[0028] In the following description, many specific details are set forth in order to provide a thorough understanding of the present application, but the present application can also be implemented in other ways different from those described herein, and those skilled in the art can make similar generalizations without departing from the scope of the present application, therefore the present application is not limited to the specific embodiments disclosed below. ​

[0029] Secondly, the "one embodiment" or "an embodiment" referred to herein means a specific feature, structure, or characteristic under discussion. Each of the various embodiments presented in the specification are not necessarily all mutually exclusive alternatives from other embodiments presented. The "in one preferred embodiment" appearing in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily mutually exclusive of the other embodiments.

[0030] Thirdly, the present application is described in detail in conjunction with the schematic drawings. In the detailed description of the embodiments of the present application, the sectional view of the device structure is partially enlarged without the general proportion for the convenience of illustration, and the schematic drawings are only examples which should not limit the scope of protection of the present application. In addition, the three-dimensional spatial dimensions of length, width and depth should be included in the actual manufacture.

[0031] Please refer to the accompanying Figures 1 to 4 The first embodiment of the present application is shown in the drawings, which provides a radiofrequency positioning needle, comprising an outer needle rod 10, an operating handle 11 fixed at one end of the outer side of the outer needle rod 10, a piercing end opened at the end of the outer needle rod 10 away from the operating handle 11, a push rod 12 slidingly connected at one end inside the operating handle 11, and an inner needle rod 13 fixed at one end of the push rod 12 close to the outer needle rod 10, further comprising:

[0032] A fixed base 14 is detachably threadedly connected at the end of the inner needle rod 13 away from the push rod 12, and the material of the fixed base 14 is metal material;

[0033] A puncture positioning needle 15 is assembled at the end of the fixed base 14 away from the inner needle rod 13, and the puncture positioning needle 15 is composed of a plurality of puncture rods fixedly connected with each other;

[0034] Among them, the radiofrequency energy is transmitted to the inner needle rod 13, and an ablation electric field is formed around the puncture positioning needle 15. In the working state, the puncture positioning needle 15 composed of a plurality of puncture rods is in a radial shape, and the central axis of the puncture rod is in a curved arc shape outwardly.

[0035] Here, the puncture positioning needle 15 has two states: initial state and working state. In the initial state, the puncture positioning needle 15 is completely located inside the outer needle rod 10. In the working state, the puncture positioning needle 15 moves to the outside of the outer needle rod 10 and pierces into the target tissue. It should be noted that in the process of moving to the outside of the outer needle rod 10, the bending amplitude of the plurality of puncture rods gradually increases, that is, the greater the distance of the movement of the puncture positioning needle 15, the greater the bending amplitude of the plurality of puncture rods, and the greater the outer diameter of the puncture positioning needle 15.

[0036] Further, in the present embodiment, the number of the puncture rods and the length of the puncture rods in the initial state can be adjusted and replaced according to the use requirements, and the number of the puncture rods is at least two. In the initial state, the greater the length of the puncture rods, the greater the upper limit of the outer diameter of the puncture positioning needle 15 in the working state. In the initial state, the smaller the length of the puncture rods, the smaller the upper limit of the outer diameter of the puncture positioning needle 15 in the working state.

[0037] It should be noted that the material of the outer needle rod 10 is any one of the following materials: high-strength metal, high-molecular material, the material of the puncture rod is memory metal or other metal, the plurality of puncture rods are formed by crimping or welding and constitute the puncture positioning needle 15, the material of the inner needle rod 13 is metal material, the inner needle rod 13 can transmit radio frequency energy to the plurality of puncture rods in the puncture positioning needle 15, so that an ablation electric field is formed around the puncture rods in the puncture positioning needle 15.

[0038] In this embodiment, when the target tissue is removed, first confirm the lesion position by CT, ultrasound and other imaging devices, plan the puncture path according to the position of the target tissue, the medical staff holds the operating handle 11 to deliver the penetrating end of the outer needle rod 10 to the vicinity of the target tissue according to the puncture path (at this time, the outer needle rod 10 does not penetrate into the target tissue), and cooperates with the imaging device to confirm whether the outer needle rod 10 reaches the expected position, pushes the push rod 12, and through the fixed connection of the push rod 12 and the inner needle rod 13, the push rod 12 drives the inner needle rod 13 to move, because the inner needle rod 13 and the fixed base 14 and the fixed base 14 and the puncture positioning needle 15 are connected with each other, the fixed base 14 and the puncture positioning needle 15 are driven by the inner needle rod 13 to move synchronously, so that the puncture positioning needle 15 gradually moves to the outside of the outer needle rod 10, and the puncture positioning needle 15 changes from a free state to a working state. In this process, the bending amplitude of the puncture rod gradually increases and penetrates into the target tissue, and the position of the puncture positioning needle 15 after penetrating into the target tissue is confirmed by the imaging device. If the position of the puncture positioning needle 15 after penetrating into the target tissue is not appropriate, it is adjusted continuously. If the position of the puncture positioning needle 15 after penetrating into the target tissue is appropriate, the radio frequency energy is delivered to the inner needle rod 13, so that an ablation electric field is formed around the puncture positioning needle 15, and the target tissue is ablated by the puncture positioning needle 15. After ablation, the radial puncture positioning needle 15 and the ablated part of the tissue are in sufficient contact and fixed, the push rod 12 is reversely rotated, the inner needle rod 13 is rotated relative to the fixed base 14 through the push rod 12, and the threaded connection between the inner needle rod 13 and the fixed base 14 is released, so that the inner needle rod 13 and the fixed base 14 are separated from each other. Pulling the operating handle 11 and the push rod 12, the outer needle rod 10 and the inner needle rod 13 are taken out of the patient's body through the cooperation of the operating handle 11 and the push rod 12. At the same time, the fixed base 14 and the puncture positioning needle 15 are retained on the target tissue, and in the subsequent removal of the target tissue, the medical staff can quickly find the target tissue through the fixed base 14 and the puncture positioning needle 15. Through the above scheme, when the target tissue is removed, the puncture positioning needle 15 penetrates into the target tissue and ablates the target tissue, so as to locally ablate the penetration position, avoid bleeding and diffusion of the target tissue, eliminate the hidden danger of medical accidents, and improve the safety factor of the operation.

[0039] Herein, in the present embodiment, the forward rotation refers to driving the operating handle 11 to rotate relative to the fixed base 14, and the inner needle rod 13 and the fixed base 14 can form a threaded connection; the reverse rotation refers to rotating the operating handle 11 relative to the fixed base 14, and the inner needle rod 13 and the fixed base 14 can release the threaded connection and separate from each other, and the forward rotation and the reverse rotation do not constitute a specific direction limitation.

[0040] It should be noted that the target tissue is ablated by the puncture positioning needle 15, and the main purpose is to ablate the target tissue near the puncture rod (blood and cells around the puncture rod) to avoid the flow of blood around the puncture rod, and the ablation time is greatly shorter than the normal radiofrequency ablation time.

[0041] Secondly, please refer to Figure 3 The inner wall of the outer needle rod 10 is fixed with a hollow guide tube 16, and the fixed base 14 and the hollow guide tube 16 are slidingly connected. The cross-sectional shape of the outer side of the hollow guide tube 16 is circular, and the cross-sectional shape of the inner wall of the hollow guide tube 16 and the outer side of the fixed base 14 are both non-circular. When the fixed base 14 slides inside the hollow guide tube 16, the hollow guide tube 16 can guide and limit the fixed base 14.

[0042] In this embodiment, before the target tissue is removed, the medical staff holds the operation handle 11 to deliver the puncture end of the outer needle rod 10 to the vicinity of the target tissue according to the puncture path, pushes the push rod 12, and moves the inner needle rod 13, the fixed base 14 and the puncture positioning needle 15 outside the outer needle rod 10 by the push rod 12. During this process, since the cross-sectional shape of the inner wall of the hollow guide tube 16 and the outer side of the fixed base 14 are both non-circular, the fixed base 14 can be guided and limited by the hollow guide tube 16, avoiding the rotation of the fixed base 14 relative to the outer needle rod 10 and the hollow guide tube 16 during the movement of the fixed base 14, and further avoiding the rotation of the puncture positioning needle 15 during the puncture of the target tissue, which causes the puncture wound to tear and expand and bleed.

[0043] It should be noted that the puncture wound refers to the wound caused by the puncture rod penetrating into the target tissue.

[0044] In a preferred embodiment, the material of the hollow guide tube 16 is one of the following materials: PTFE, PFA or other high polymer insulating material. In this embodiment, the material of the hollow guide tube 16 is preferably PTFE.

[0045] In this embodiment, when the puncture positioning needle 15 penetrates into the target tissue, the radiofrequency energy is delivered to the inner needle rod 13, so that the puncture positioning needle 15 releases an ablation electric field to ablate the target tissue. During the ablation process, the arrangement of the hollow guide tube 16 can avoid the contact between the inner needle rod 13 or / and the fixed base 14 or / and the puncture positioning needle 15 and the outer needle rod 10, and the occurrence of sparking phenomenon.

[0046] Secondly, please refer to Figure 1The outer side of the push rod 12 is uniformly provided with a plurality of scale lines, and the scale lines are matched with the operation handle 11. In the working state, the moving distance of the push rod 12 relative to the operation handle 11 is recorded as L, the outer peripheral diameter of the radial puncture positioning needle 15 is recorded as R, and L = MR, wherein M is a constant.

[0047] Here, the diameter of the puncture positioning needle 15 refers to the maximum outer peripheral diameter formed after the plurality of puncture rods are bent away from the one end of the fixed base 14.

[0048] It should be noted that the value range of M is 0-5 (not including 0), and the specific value of M is related to the material characteristics of the puncture rod. When determining the value of M, it can be obtained through multiple tests. In this embodiment, the value of M is 1.

[0049] In this embodiment, the setting of the scale lines facilitates the medical staff to accurately control and identify the moving distance of the push rod 12 relative to the operation handle 11, and further accurately control and identify the outer peripheral diameter of the puncture positioning needle 15 and the size of the ablation area, so that the device is suitable for target tissues of different sizes, and the application range of the device is improved.

[0050] In a specific embodiment, the push rod 12 is pushed so that the scale line at 1.5 cm and the one end of the operation handle 11 away from the outer needle rod 10 are aligned (i.e. the push rod 12 moves 1.5 cm relative to the operation handle 11), at this time, the outer peripheral diameter of the puncture positioning needle 15 is 1.5 cm.

[0051] Please refer again to Figures 1 to 3 As shown in the figure, the one end of the push rod 12 away from the operation handle 11 is fixed with a syringe 17 and a cable 18, the one end of the syringe 17 away from the push rod 12 is provided with a luer joint, and the cable 18 is connected with the inner needle rod 13. The push rod 12, the inner needle rod 13, the fixed base 14 and the puncture positioning needle 15 are all hollow structures, and a cooling passage is formed between the push rod 12, the inner needle rod 13, the fixed base 14, the puncture positioning needle 15 and the syringe 17. The one end of the syringe 17 away from the push rod 12 is the input end of the cooling passage, and the one end of the puncture positioning needle 15 away from the inner needle rod 13 is the output end of the cooling passage.

[0052] It should be noted that a control module is also used with the device, and the control module at least includes a radio frequency generating module and a coolant delivery module. The radio frequency generating module is connected with the cable 18, and the radio frequency generating module can deliver radio frequency energy to the inner needle rod 13 through the cable 18. The coolant delivery module is connected with the syringe 17, and the coolant delivery module can deliver cooling medium to the cooling passage through the syringe 17. The cooling medium can be one of the following substances: physiological saline, pure water. In this embodiment, the cooling medium is preferably physiological saline.

[0053] Further, the target tissue is ablated by the puncture positioning needle 15, and the main purpose is to ablate the target tissue (such as blood and cells around the puncture rod, not the entire target tissue) near the puncture rod, and the ablation duration is short, and the physiological saline consumption is small.

[0054] In this embodiment, the radio frequency generating module is started, the target tissue is ablated by the puncture positioning needle 15, and at the same time, the refrigerant conveying module is started, and the physiological saline is conveyed to the inside of the cooling channel. The physiological saline flows to the target tissue through the output end of the cooling channel, cools the target tissue and the hollow guide tube 16, and at the same time ensures that the target tissue has a good impedance matching value, so as to facilitate the radio frequency ablation of the target tissue.

[0055] It should be noted that before the threaded connection between the inner needle rod 13 and the fixed base 14 is released, the connection between the refrigerant conveying module and the injection tube 17 and the radio frequency generating module and the cable 18 is released, so as to avoid the winding phenomenon of the injection tube 17 and the cable 18 during the rotation of the push rod 12.

[0056] Please refer to Figure 2 and Figure 3 , the end of the fixed base 14 away from the puncture positioning needle 15 and located between the inner needle rod 13 and the hollow guide tube 16 is fixed with a positioning line 19, the end of the positioning line 19 away from the fixed base 14 extends to the outside of the operating handle 11, and the end of the positioning line 19 away from the fixed base 14 is in a free state. The material of the positioning line 19 is one of the following materials: nylon, medical suture or other high polymer material. Specifically, in this embodiment, the material of the positioning line 19 is preferably medical suture.

[0057] In this embodiment, since one end of the positioning line 19 is fixedly connected with the fixed base 14, after the target tissue is ablated by the puncture positioning needle 15 and the outer needle rod 10 and the inner needle rod 13 are taken out of the patient's body, the fixed base 14 and the puncture positioning needle 15 remain in the patient's body. Since the end of the positioning line 19 away from the fixed base 14 is in a free state, during the process of taking out the outer needle rod 10 and the inner needle rod 13, the end of the positioning line 19 away from the fixed base 14 passes through the operating handle 11 and the inside of the outer needle rod 10 and remains outside the patient's body. When the medical staff removes the target tissue, the target tissue can be quickly found along the positioning line 19, and the target tissue is removed.

[0058] The working principle of the present application is as follows:

[0059] Please refer to Figure 4As shown, when the target tissue is resected, first confirm the lesion position under the image equipment such as CT, ultrasound, etc., plan the puncture path according to the position of the target tissue, the medical staff holds the operating handle 11 and transports the penetrating end of the outer needle rod 10 to the vicinity of the target tissue according to the puncture path, pushes the push rod 12, synchronously moves the inner needle rod 13, the fixed base 14 and the puncture positioning needle 15 through the push rod 12, so that the puncture positioning needle 15 changes from the free state to the working state, in this process, the bending amplitude of the puncture rod gradually increases and penetrates into the target tissue, and the outer diameter of the puncture positioning needle 15 can be controlled through the scale line on the surface of the push rod 12, start the radio frequency generating module, transmit radio frequency energy to the inner needle rod 13, so that an ablation electric field is formed around the puncture positioning needle 15, and the target tissue is subjected to radio frequency ablation through the puncture positioning needle 15, so that the blood and target tissue around the puncture rod are coagulated, during the ablation process, start the refrigerant delivery module, deliver physiological saline to the inside of the cooling channel, the physiological saline flows to the target tissue through the output end of the cooling channel, and the target tissue and the hollow guide tube 16 are cooled, after the ablation is completed, the radial puncture positioning needle 15 and the ablated part of the tissue are in full contact and fixed, the connection between the refrigerant delivery module and the injection tube 17 and the radio frequency generating module and the cable 18 is released, the push rod 12 is reversely rotated, the inner needle rod 13 is rotated through the push rod 12, so that the inner needle rod 13 rotates relative to the fixed base 14, the threaded connection between the inner needle rod 13 and the fixed base 14 is released, so that the inner needle rod 13 and the fixed base 14 are separated from each other, the operating handle 11 and the push rod 12 are pulled out, the outer needle rod 10 and the inner needle rod 13 are taken out of the patient's body, at the same time, the fixed base 14 and the puncture positioning needle 15 are retained on the target tissue, and the positioning line 19 extends from the target tissue to the outside of the patient's body, in the subsequent resection of the target tissue, the medical staff can quickly find the target tissue and resect it through the cooperation of the fixed base 14, the puncture positioning needle 15 and the positioning line 19, the puncture positioning needle 15 penetrates into the target tissue and ablates the target tissue, which avoids bleeding, diffusion and other conditions of the target tissue, eliminates the hidden danger of causing medical accidents, and improves the safety factor of the operation.

[0060] The above is only the preferred embodiment of the present application, it should be pointed out that for ordinary skilled in the art, without departing from the principles of the present application, can make a number of improvements and refinements, these improvements and refinements should also be considered as the protection scope of the present application. The structures, devices and operation methods not specifically described and explained in the present application, such as no special description and limitation, are implemented according to the conventional means in the art.

Claims

1. A radio frequency positioning needle, characterized by: The invention comprises an outer needle rod (10), an operating handle (11) being fixed to one end of the outer side of the outer needle rod (10), a push rod (12) being slidably connected to one end of the inner side of the operating handle (11), a plurality of scale lines being evenly arranged on the outer side of the push rod (12), and the scale lines being adapted to the operating handle (11), an inner needle rod (13) being fixed to one end of the push rod (12) close to the outer needle rod (10), an injection tube (17) and a cable (18) being fixed to one end of the push rod (12) away from the operating handle (11), and the cable (18) being connected to the inner needle rod (13), and further comprises: A fixed base (14), wherein the fixed base (14) is detachably assembled on one end of the inner needle rod (13); A puncture positioning needle (15), the puncture positioning needle (15) is assembled on one end of the fixed base (14), and the puncture positioning needle (15) is composed of a plurality of puncture rods fixedly connected to each other; A hollow guide tube (16) is fixed to the inner wall of the outer needle rod (10), and the fixed base (14) and the hollow guide tube (16) are slidably connected. The inner wall cross-sectional shape of the hollow guide tube (16) and the outer cross-sectional shape of the fixed base (14) are both non-circular. A positioning line (19) is fixed to the end of the fixed base (14) away from the puncture positioning needle (15) and between the inner needle rod (13) and the hollow guide tube (16). The positioning line (19) extends from the end of the fixed base (14) away from the fixed base (14) to the outside of the operating handle (11); Wherein, in the working state, the moving distance of the push rod (12) relative to the operating handle (11) is recorded as L, and the outer diameter of the radial puncture positioning needle (15) is recorded as R, L=MR, wherein M is a constant, the puncture positioning needle (15) composed of multiple puncture rods is radial, and the central axis of the puncture rod is in the form of an arc curve bent outward, the greater the moving distance of the puncture positioning needle (15), the greater the bending amplitude of the multiple puncture rods, the larger the outer diameter of the puncture positioning needle (15), and radio frequency energy is transmitted to the inner needle rod (13), so that an ablation electric field is formed around the puncture positioning needle (15), and radio frequency ablation is performed on the target tissue through the puncture positioning needle (15). After the ablation is completed, the radial The puncture positioning needle (15) is fully contacted and fixed with the tissue of the ablation part, and the push rod (12) is rotated in the opposite direction. The push rod (12) drives the inner needle rod (13) to rotate relative to the fixed base (14) and releases the threaded connection between the inner needle rod (13) and the fixed base (14), so that the inner needle rod (13) and the fixed base (14) are separated from each other. The operating handle (11) and the push rod (12) are pulled to remove the outer needle rod (10) and the inner needle rod (13) from the patient's body. At the same time, the fixed base (14) and the puncture positioning needle (15) remain on the target tissue. When the target tissue is subsequently removed, medical staff can quickly find the target tissue through the fixed base (14) and the puncture positioning needle (15).

2. The radio frequency positioning needle according to claim 1, characterized in that: The material of the hollow guide tube (16) is one of the following materials: PTFE, PFA or other polymer insulating materials.

3. The radio frequency positioning needle according to claim 1, characterized in that: The push rod (12), the inner needle rod (13), the fixed base (14) and the puncture positioning needle (15) are all hollow structures, and a cooling passage is formed among the push rod (12), the inner needle rod (13), the fixed base (14), the puncture positioning needle (15) and the injection tube (17), wherein the end of the injection tube (17) away from the push rod (12) is the input end of the cooling passage, and the end of the puncture positioning needle (15) away from the inner needle rod (13) is the output end of the cooling passage.

4. The radio frequency positioning needle according to claim 1, characterized in that: The positioning line (19) is made of medical suture thread.

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