A positionable bipolar radiofrequency ablation electrode

Abstract

This invention discloses a positionable bipolar radiofrequency ablation electrode, relating to the field of medical device technology. It includes a handheld end with an electrode needle at its bottom. A hollow screw is disposed within the inner cavity of the handheld end. A partition is rotatably connected to the surface of the hollow screw and fixedly connected to the inner wall of the handheld end. A threaded seat is threadedly connected to the bottom of the hollow screw. A hollow tube communicates with the bottom of the threaded seat and is fixedly connected to the electrode needle. A first driving component is disposed on one side of the threaded seat. A second driving component allows for flexible adjustment of the distance between the second electrode and the electrode needle, expanding the ablation range. The first driving component allows for flexible adjustment of the extension and retraction length of the electrode needle, adapting to lesions of different depths. Simultaneously, the adsorption component efficiently adsorbs accumulated fluid and gas generated during the ablation process, with the adsorption range expanding synchronously with the ablation range, ensuring that accumulated fluid and gas in different ablation areas are completely discharged, maintaining the stability of the local thermal field.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and in particular to a positionable bipolar radiofrequency ablation electrode. Background Technology

[0002] Radiofrequency ablation, as an important means of minimally invasive tumor treatment, has been widely used in the clinical treatment of various solid tumors such as liver, lung, and thyroid tumors due to its advantages of minimal trauma, rapid recovery, and high safety. Bipolar radiofrequency ablation electrodes, because energy is only generated between the two electrodes to form a local closed circuit, offer high ablation precision and minimal damage to normal tissues, making them one of the mainstream research and development directions for radiofrequency ablation equipment.

[0003] Currently, while existing positionable bipolar radiofrequency ablation electrodes can adjust the electrode needle length according to the tumor location and depth to adapt to the puncture needs of different lesions, they still have significant shortcomings in clinical application. On the one hand, for medium and large tumors, the effective ablation range of existing electrode needles is limited. A single electrode can only cover a small lesion area in a single ablation, requiring multiple punctures and repeated ablation to complete the treatment. This not only prolongs the operation time and reduces the treatment efficiency, but also increases the patient's trauma risk and the incidence of intraoperative complications. On the other hand, medium and large tumors often have fluid accumulation and exudation due to tissue necrosis, or residual trace amounts of gas after puncture. Fluid accumulation and gas accumulation can significantly disperse the heat generated by the radiofrequency current, disrupting the stability of the local thermal field. This leads to a significant decrease in the heating efficiency of the tissue around the electrode, making it difficult for the tumor tissue to reach the effective temperature required for coagulation and necrosis. Consequently, the actual ablation range is reduced, and problems such as incomplete tumor ablation and high postoperative recurrence rates are likely to occur. Summary of the Invention

[0004] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be construed as limiting the scope of the invention.

[0005] In view of the problems existing in the above and / or existing locatable bipolar radiofrequency ablation electrodes, the present invention is proposed.

[0006] Therefore, the problem to be solved by the present invention is how to address the limited effective ablation range of existing electrode needles, the fact that a single electrode can only cover a small lesion area in a single ablation, and the fact that fluid and gas accumulation can significantly disperse the heat generated by radiofrequency current, disrupting the stability of the local thermal field and causing a significant decrease in the heating efficiency of the tissue around the electrode.

[0007] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a positionable bipolar radiofrequency ablation electrode, comprising: a handheld end with an electrode needle at its bottom; a hollow screw disposed in the inner cavity of the handheld end; a partition rotatably connected to the surface of the hollow screw and fixedly connected to the inner wall of the handheld end; a threaded seat threadedly connected to the bottom of the hollow screw; a hollow tube communicating with the bottom of the threaded seat and fixedly connected to the electrode needle; a first driving member disposed on one side of the threaded seat for adjusting the extension and retraction length of the electrode needle; a second driving member disposed on the other side of the threaded seat for adjusting the ablation range; a through groove opened on the surface of the threaded seat; a lead screw rotatably connected to the inner wall of the through groove; a driving block threadedly connected to the surface of the lead screw; a sleeve fixedly connected to one side of the driving block and slidably connected to the threaded seat; a switching member disposed between the first and second driving members; a second electrode fixedly connected to the bottom of the sleeve surface; a threaded sleeve fixedly connected to the top of the handheld end; and an adsorption member disposed at the bottom of the second electrode for adsorbing accumulated liquid and gas.

[0008] As a preferred embodiment of the positionable bipolar radiofrequency ablation electrode of the present invention, the first driving member includes a gear one disposed at the bottom of the partition, a gear two meshing on one side of the gear one, the tops of both the gear one and the gear two being rotatably connected to the partition, and a gear three meshing on one side of the gear two and being fixedly connected to a hollow screw.

[0009] As a preferred embodiment of the positionable bipolar radiofrequency ablation electrode of the present invention, wherein: sliders are fixedly connected to both sides of the threaded seat, and grooves are provided on both sides of the inner wall of the handheld end, which cooperate with the sliders.

[0010] As a preferred embodiment of the positionable bipolar radiofrequency ablation electrode of the present invention, the second driving member includes a gear four fixedly connected to one side of the inner wall of the handheld end, and a gear five meshing with one side of the gear four and fixedly connected to the lead screw.

[0011] As a preferred embodiment of the positionable bipolar radiofrequency ablation electrode of the present invention, the switching component includes a mounting groove formed on the surface of the handheld end, and push-pull grooves are formed on the top and bottom of one side of the handheld end and are connected to the mounting groove. Push-pull plates are slidably connected to the inner cavity of each push-pull groove. A rotating seat is rotatably connected to the side of the push-pull plate away from the push-pull groove, and a dial is rotatably connected to the surface of the rotating seat.

[0012] As a preferred embodiment of the positionable bipolar radiofrequency ablation electrode of the present invention, wherein: a support rod is fixedly connected to the top and bottom of the rotating seat, a first gear is slidably connected to the surface of the support rod, a spring is fixedly connected to the inner wall of the first gear and fixedly connected to the support rod, a second gear is provided at the top of the first gear, the top of the second gear is fixedly connected to a gear one, a third gear is provided at the bottom of the first gear, and the bottom of the third gear is fixedly connected to a gear four.

[0013] As a preferred embodiment of the positionable bipolar radiofrequency ablation electrode of the present invention, wherein: a limiting block is fixedly connected to the surface of the push-pull plate, and a limiting groove is formed on the inner wall of the push-pull groove and cooperates with the limiting block.

[0014] As a preferred embodiment of the positionable bipolar radiofrequency ablation electrode of the present invention, wherein: both sides of the inner wall of the push-pull groove are fixedly connected with abutment blocks, and both sides of the push-pull plate are provided with abutment grooves that cooperate with the abutment blocks.

[0015] As a preferred embodiment of the positionable bipolar radiofrequency ablation electrode of the present invention, the adsorption element includes a wire harness first disposed on the top of the wire threading sleeve, the bottom of the wire harness first passing through the wire threading sleeve, the handheld end, the hollow screw and the hollow tube, and being fixedly connected to the electrode needle, and the surface of the wire harness first is covered with an adsorption tube, which is fixedly connected to the inner wall of the hollow tube.

[0016] As a preferred embodiment of the positionable bipolar radiofrequency ablation electrode of the present invention, the hollow tube has a first adsorption hole on its surface, the adsorption tube has a second adsorption hole on its surface, the top of the adsorption tube is connected to a negative pressure tube, and one side of the negative pressure tube passes through a wire sleeve and extends to the outside of the wire sleeve.

[0017] The beneficial effects of this invention are as follows: Through the cooperation of the second driving component, lead screw, driving block, sleeve, and second electrode, the distance between the second electrode and the electrode needle can be flexibly adjusted, expanding the ablation range and adapting to medium and large tumors of different sizes. Furthermore, through the cooperation of the first driving component with the hollow screw, threaded seat, and hollow tube, the extension and retraction length of the electrode needle can be flexibly adjusted, adapting to lesions of different depths. Thus, the treatment of medium and large tumors can be completed without multiple punctures and repeated ablation, thereby shortening the operation time, improving treatment efficiency, reducing puncture trauma and intraoperative complications, and alleviating patient suffering. Simultaneously, the adsorption component can efficiently adsorb the accumulated fluid and gas generated during ablation, and the adsorption range can expand synchronously with the ablation range, ensuring that accumulated fluid and gas in different ablation areas are completely discharged, maintaining the stability of the local thermal field, thereby improving the heating efficiency of the tissue surrounding the electrode and ensuring that the tumor tissue can reach the effective temperature required for coagulation and necrosis. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the overall structure of a positionable bipolar radiofrequency ablation electrode.

[0020] Figure 2 This is a three-dimensional cross-sectional view of a positionable bipolar radiofrequency ablation electrode.

[0021] Figure 3 For a locatable bipolar radiofrequency ablation electrode Figure 2 Enlarged view of region A in the middle.

[0022] Figure 4 This is a partial structural cross-sectional view of a positionable bipolar radiofrequency ablation electrode.

[0023] Figure 5 For a locatable bipolar radiofrequency ablation electrode Figure 4 Enlarged view of region B in the middle.

[0024] Figure 6 A three-dimensional cross-sectional view of the handheld end, threaded seat, hollow tube, sleeve, and adsorption tube of a positionable bipolar radiofrequency ablation electrode.

[0025] Figure 7 For a locatable bipolar radiofrequency ablation electrode Figure 6 Enlarged view of region C.

[0026] Figure 8 This is a cross-sectional view of the handheld end, second electrode, sleeve, and adsorption tube of a positionable bipolar radiofrequency ablation electrode.

[0027] Figure 9 For a locatable bipolar radiofrequency ablation electrode Figure 8 Enlarged view of region D in the middle.

[0028] In the diagram: 1. Handheld end; 11. Electrode needle; 12. Second electrode; 2. Hollow screw; 21. Partition plate; 22. Threaded seat; 23. Hollow tube; 24. First driving component; 241. Gear 1; 242. Gear 2; 243. Gear 3; 244. Slider; 245. Slide groove; 25. Second driving component; 251. Gear 4; 252. Gear 5; 26. Lead screw; 27. Driving block; 28. Sleeve; 29. ​​Switching component; 291. Mounting slot; 292. Push-pull 293. Slot; 294. Push-pull plate; 295. Rotating seat; 296. Dial; 297. Support rod; 298. First gear; 299. Spring; 2910. Second gear; 2911. Third gear; 2912. Limiting block; 2913. Limiting slot; 2914. Abutting block; 2915. Abutting slot; 3. Threading sleeve; 31. Adsorption component; 311. Wire harness one; 312. Adsorption tube; 313. First adsorption hole; 314. Second adsorption hole; 315. Negative pressure tube. Detailed Implementation

[0029] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0030] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0031] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that is mutually exclusive with other embodiments.

[0032] Example 1, referring to Figures 1-9This is the first embodiment of the present invention, which provides a positionable bipolar radiofrequency ablation electrode, including: a handheld end 1 with an electrode needle 11 disposed at its bottom; a hollow screw 2 disposed in the inner cavity of the handheld end 1; a partition 21 rotatably connected to the surface of the hollow screw 2 and fixedly connected to the inner wall of the handheld end 1; a threaded seat 22 threadedly connected to the bottom of the hollow screw 2; a hollow tube 23 communicating with the bottom of the threaded seat 22 and fixedly connected to the electrode needle 11; a first driving member 24 disposed on one side of the threaded seat 22 for adjusting the extension and retraction length of the electrode needle 11; and a second driving member 25. Located on the other side of the threaded seat 22, it is used to adjust the ablation range. A through groove is opened on the surface of the threaded seat 22. The lead screw 26 is rotatably connected to the inner wall of the through groove. The drive block 27 is threadedly connected to the surface of the lead screw 26. The sleeve 28 is fixedly connected to one side of the drive block 27 and slidably connected to the threaded seat 22. The switching component 29 is located between the first drive component 24 and the second drive component 25. The second electrode 12 is fixedly connected to the bottom of the surface of the sleeve 28. The threaded sleeve 3 is fixedly connected to the top of the handheld end 1. The adsorption component 31 is located at the bottom of the second electrode 12 and is used to adsorb accumulated liquid and gas.

[0033] The handheld end 1 provides a gripping carrier for the entire device. The electrode needle 11 at the bottom serves as the main ablation electrode, responsible for puncturing the lesion area and releasing radiofrequency energy. The hollow screw 2 is set in the inner cavity of the handheld end 1. Together with the partition 21, threaded seat 22, and hollow tube 23, it forms the telescopic adjustment mechanism of the electrode needle 11, providing a structural basis for adjusting the length of the electrode needle 11. The first driving component 24 is specifically used to adjust the telescopic length of the electrode needle 11. It can flexibly adjust the size of the electrode needle 11 extending out of the handheld end 1 according to the tumor depth, adapting to the puncture needs of lesions at different depths and locations.

[0034] The second driving component 25 is used to adjust the ablation range. By driving related components, it moves the second electrode 12, changing the distance between the second electrode 12 and the electrode needle 11, thus overcoming the limitations of existing electrodes with fixed ablation ranges that are difficult to cover medium and large tumors. Through the through groove, lead screw 26, driving block 27, and sleeve 28 as auxiliary structures of the second driving component 25, the smooth sliding of the second electrode 12 is achieved, ensuring the reliability of the ablation range adjustment. The switching component 29 is set between the first driving component 24 and the second driving component 25 to realize the rapid switching between the two adjustment functions, avoid operational confusion, and improve surgical efficiency. The second electrode 12 and the electrode needle 11 cooperate to form a bipolar structure, so that the radiofrequency energy forms a closed loop only between the two poles, improving the ablation accuracy and reducing damage to normal tissues. The threading sleeve 3 is used to organize the wire bundle and tubing, avoid tangling during the operation, and improve the safety of operation. The adsorption component 31 is set at the bottom of the second electrode 12 and is specifically used to adsorb the accumulated fluid and gas generated during the ablation process, solving the problem that accumulated fluid and gas disperse heat, destroy the thermal field stability, and lead to incomplete ablation.

[0035] Electrode needle 11 and second electrode 12 are both existing technologies, which are clearly known to those skilled in the art, and will not be described in detail here.

[0036] Example 2, refer to Figures 1-9 This is the second embodiment of the present invention, which is based on the previous embodiment.

[0037] Specifically, the first driving component 24 includes a gear 241 disposed at the bottom of the partition 21, a gear 242 meshing on one side of the gear 241, the tops of both the gear 241 and the gear 242 being rotatably connected to the partition 21, and a gear 243 meshing on one side of the gear 242 and being fixedly connected to the hollow screw 2.

[0038] Among them, gear 241 is rotatably connected to the bottom of partition 21, serving as an intermediate carrier for power input; gear 242 meshes with gear 241, playing the role of power transmission and steering, so that power can be smoothly transmitted to gear 243; gear 243 is fixedly connected to hollow screw 2. When gear 243 rotates, it can directly drive hollow screw 2 to rotate synchronously, and then through the threaded engagement of thread seat 22 and hollow screw 2, drive hollow tube 23 and electrode needle 11 to achieve extension and retraction.

[0039] Specifically, sliders 244 are fixedly connected to both sides of the threaded seat 22, and grooves 245 are opened on both sides of the inner wall of the hand-held end 1, which cooperate with the sliders 244.

[0040] When the first driving member 24 drives the hollow screw 2 to rotate, the threaded seat 22 will move up and down along the axial direction of the hollow screw 2. At this time, the slider 244 slides synchronously in the groove 245, which can restrict the rotation of the threaded seat 22, so that the threaded seat 22 can only move smoothly along the axial direction, thereby driving the hollow tube 23 and the electrode needle 11 to extend and retract smoothly, avoiding the electrode needle 11 from being skewed or deviated, and ensuring the accuracy of puncture positioning.

[0041] Specifically, the second driving component 25 includes a gear 251 fixedly connected to one side of the inner wall of the handheld end 1, a gear 252 meshing with one side of the gear 251, and a lead screw 26 fixedly connected to it.

[0042] Among them, gear four 251 is fixedly connected to one side of the inner wall of the handheld end 1 as the carrier of power input; gear five 252 meshes with gear four 251 and is fixedly connected to lead screw 26. When gear four 251 rotates, it will drive gear five 252 to rotate synchronously, which in turn drives lead screw 26 to rotate. Through the threaded engagement between lead screw 26 and drive block 27, the rotational motion of lead screw 26 is converted into linear motion of drive block 27, thereby driving sleeve 28 and second electrode 12 to slide along thread seat 22, changing the distance between second electrode 12 and electrode needle 11, and realizing the adjustment of ablation range.

[0043] Specifically, the switching component 29 includes a mounting groove 291 formed on the surface of the handheld end 1. Push-pull grooves 292 are formed on the top and bottom of one side of the handheld end 1 and are connected to the mounting groove 291. Push-pull plates 293 are slidably connected to the inner cavity of the push-pull grooves 292. A rotating seat 294 is rotatably connected to the side of the push-pull plate 293 away from the push-pull groove 292. A dial 295 is rotatably connected to the surface of the rotating seat 294.

[0044] The mounting slot 291 provides installation space for each component of the switching element 29. The push-pull slot 292 is connected to the mounting slot 291 and provides guidance for the movement of the push-pull plate 293. The push-pull plate 293 can move up and down along the push-pull slot 292, driving the rotating seat 294 and the dial 295 to move synchronously, realizing the switching of the power transmission object. The rotating seat 294 is used to install the dial 295 and subsequent transmission components. The dial 295 serves as a power input component, which is rotated and operated by medical staff to transmit power.

[0045] Medical staff can quickly switch the power transmission direction of the dial 295 by pushing and pulling the push-pull plate 293 up and down, so as to switch the extension and retraction of the electrode needle 11 and the ablation range adjustment. The operation is convenient and the switching is quick. No additional tools are required, which effectively saves surgical time and avoids accidental triggering of the two adjustment functions, thus improving the safety and convenience of the surgical operation.

[0046] Specifically, both sides of the inner wall of the push-pull groove 292 are fixedly connected with abutment blocks 2913, and both sides of the push-pull plate 293 are provided with abutment grooves 2914, which cooperate with the abutment blocks 2913.

[0047] The abutment block 2913 has a certain degree of elasticity. When the push-pull plate 293 moves along the push-pull groove 292 to the designated position, the abutment block 2913 undergoes elastic deformation due to the pressure of the push-pull plate 293. After the abutment groove 2914 on the push-pull plate 293 aligns with the abutment block 2913, the abutment block 2913 resets under its own elasticity and engages with the abutment groove 2914, thereby firmly fixing the push-pull plate 293 in the current position. This fixing method can lock the meshing state of the first gear 297 and the second gear 299 or the third gear 2910, ensuring stable and reliable power transmission, effectively preventing the push-pull plate 293 from shifting due to accidental contact during the operation, thereby preventing unexpected changes in the extension length and ablation range of the electrode needle 11, and ensuring the stability and safety of the surgical operation.

[0048] Meanwhile, the snap-fit ​​structure is easy to operate. Medical staff only need to apply a moderate pushing force to switch and fix the push-pull plate 293 without the need for additional locking components, which simplifies the operation process, further improves the efficiency of surgical operation, and meets the convenience needs of clinical minimally invasive treatment.

[0049] Specifically, the adsorption component 31 includes a first wire harness 311 disposed on the top of the threading sleeve 3. The bottom of the first wire harness 311 passes through the threading sleeve 3, the handheld end 1, the hollow screw 2, and the hollow tube 23, and is fixedly connected to the electrode needle 11. The surface of the first wire harness 311 is covered with an adsorption tube 312, which is fixedly connected to the inner wall of the hollow tube 23. A second wire harness is fixedly connected to the inner wall of the sleeve 28. One end of the second wire harness is connected to the second electrode 12, and the other end passes through the hollow tube 23 and the adsorption tube 312, and is connected to the first wire harness 311. The second wire harness has a reserved length in the sleeve 28 to facilitate the position adjustment of the second electrode 12. A first adsorption hole 313 is opened on the surface of the hollow tube 23, and a second adsorption hole 314 is opened on the surface of the adsorption tube 312. A negative pressure tube 315 is connected to the top of the adsorption tube 312. One side of the negative pressure tube 315 passes through the threading sleeve 3 and extends to the outside of the threading sleeve 3.

[0050] The wire harness 311 passes through the wire sleeve 3, the handheld end 1, the hollow screw 2 and the hollow tube 23, and is fixedly connected to the electrode needle 11, providing radio frequency energy transmission and signal transmission for the electrode needle 11; the adsorption tube 312 is covered on the surface of the wire harness 311, serving as an adsorption channel for accumulated liquid and gas, collecting and discharging the accumulated liquid and gas generated by ablation.

[0051] The first adsorption hole 313 and the second adsorption hole 314 are used to introduce the accumulated liquid and gas generated by ablation into the adsorption tube 312. The negative pressure tube 315 extends to the outside through the threaded sleeve 3 and is connected to the negative pressure equipment to provide power for adsorption. When the second electrode 12 moves and the ablation range expands, the sleeve 28 and the second electrode 12 slide along the hollow tube 23, which will expose more of the first adsorption hole 313 and the second adsorption hole 314, so that the adsorption range expands synchronously with the ablation range, ensuring that the accumulated liquid and gas in different ablation ranges can be efficiently adsorbed.

[0052] Working principle: In the initial state, the push-pull plate 293 is in the initial position, and the abutment grooves 2914 and abutment blocks 2913 at the top and bottom are separated. At this time, the first gear 297, the second gear 299, and the third gear 2910 are not meshed. The extension length of the electrode needle 11 and the relative position of the second electrode 12 are locked to avoid misoperation during the operation and ensure the safety of the operation.

[0053] During the puncture positioning stage, the extension and retraction length of the electrode needle 11 can be adjusted according to the depth requirements of the tumor. By moving the push-pull plate 293 upward, the abutment grooves 2914 on both sides of the push-pull plate 293 are aligned with the abutment blocks 2913 on the inner wall of the push-pull groove 292. The abutment blocks 2913 are restored and engage with the abutment grooves 2914, fixing the position of the push-pull plate 293. At this time, the rotating seat 294 drives the first gear 297 to move upward synchronously and mesh with the second gear 299 (if the teeth are not aligned, the first gear 297 compresses the spring 298 in a contracted state. After the dial 295 is rotated to align the teeth, the spring 298 releases its elastic potential energy to complete the engagement). Then, the dial 295 is rotated to drive the rotating seat 294 and the first gear 297. When the first gear 297 rotates, it drives the second gear 299 to rotate synchronously. The second gear 299 drives the first gear 241 to rotate. The first gear 241 meshes with the second gear 242 to rotate. The second gear 242 meshes with the third gear 243 to rotate. The third gear 243 drives the hollow screw 2 to rotate. Since the threaded seat 22 is threadedly connected to the hollow screw 2, and the sliders 244 on both sides of the threaded seat 22 slide in the grooves 245 on the inner wall of the handheld end 1, the rotation of the threaded seat 22 is restricted. Therefore, when the hollow screw 2 rotates, the threaded seat 22 moves downward along the axial direction of the hollow screw 2, which drives the hollow tube 23 and the electrode needle 11 to move downward synchronously. The length of the electrode needle 11 extending out of the handheld end 1 is adjusted until it matches the depth of the tumor, thus completing the puncture positioning.

[0054] During the ablation range adjustment phase, the distance between the second electrode 12 and the electrode needle 11 can be adjusted according to the size of the tumor to expand the ablation range. By moving the push-pull plate 293 downwards in the opposite direction, the top abutment groove 2914 and the abutment block 2913 are separated. Continue moving the push-pull plate 293 until the bottom abutment groove 2914 and the abutment block 2913 are engaged, and then fix the push-pull plate 293. At this time, the rotating seat 294 drives the first gear 297 to move downwards synchronously and mesh with the third gear 2910 (if the teeth are not aligned, the meshing is completed by the elastic potential energy of the spring 298). Then, the dial 295 is rotated to drive the first gear 297 to move downwards synchronously. When face gear 297 rotates, face gear 297 drives face gear 2910 to rotate, face gear 2910 drives gear 4 251 to rotate, gear 4 251 meshes and drives gear 5 252 to rotate, gear 5 252 drives lead screw 26 to rotate. Since drive block 27 is threadedly connected to lead screw 26 and sleeve 28 is slidably connected to threaded seat 22, when lead screw 26 rotates, drive block 27 drives sleeve 28 to slide along threaded seat 22. Sleeve 28 drives second electrode 12 to move synchronously, changing the distance between second electrode 12 and electrode needle 11, thereby expanding the ablation range to meet the ablation needs of medium and large tumors.

[0055] During the simultaneous ablation and adsorption phase, when the electrode needle 11 and the second electrode 12 are energized, a bipolar closed circuit is formed, releasing radiofrequency energy to ablate the tumor tissue. Simultaneously, the external negative pressure device is activated, generating suction through the negative pressure tube 315. The accumulated fluid and gas generated during the ablation process enter the adsorption tube 312 through the first adsorption hole 313 and the second adsorption hole 314, and are finally discharged through the negative pressure tube 315. During the process of adjusting the position of the second electrode 12 and expanding the ablation range, the sleeve 28 and the second electrode 12 slide along the hollow tube 23, and the number of exposed first adsorption holes 313 and second adsorption holes 314 increases adaptively, so that the adsorption range expands synchronously with the ablation range, ensuring that the accumulated fluid and gas are fully and efficiently adsorbed, and maintaining the stability of the thermal field.

[0056] After the surgery, reverse the operation of the switching component 29 and the two sets of driving components, adjust the electrode needle 11 to retract to the handheld end 1, reset the second electrode 12, turn off the negative pressure device, and complete the surgical operation.

[0057] A second wire harness is fixedly connected to the inner wall of the sleeve 28. One end of the second wire harness is connected to the second electrode 12, and the other end passes through the hollow tube 23 and the adsorption tube 312 and is connected to the first wire harness 311. The second wire harness has a reserved length inside the sleeve 28 to facilitate the position adjustment of the second electrode 12.

[0058] Example 3, referring to Figures 2-5 This is the third embodiment of the present invention, which is based on the first two embodiments.

[0059] Specifically, the top and bottom of the rotating seat 294 are fixedly connected to support rods 296. The surface of the support rods 296 is slidably connected to a first gear 297. The inner wall of the first gear 297 is fixedly connected to a spring 298, which is also fixedly connected to the support rods 296. A second gear 299 is provided on the top of the first gear 297. The top of the second gear 299 is fixedly connected to a gear 1 241. A third gear 2910 is provided on the bottom of the first gear 297. The bottom of the third gear 2910 is fixedly connected to a gear 4 251. A limit block 2911 is fixedly connected to the surface of the push-pull plate 293. A limit groove 2912 is opened on the inner wall of the push-pull groove 292 and cooperates with the limit block 2911.

[0060] The support rod 296 is fixed to the top and bottom of the rotating seat 294, providing sliding support for the first gear 297; the first gear 297 can slide up and down along the support rod 296, and is reset by the spring 298. The elastic potential energy of the spring 298 can ensure that the first gear 297 is tightly meshed with the second gear 299 or the third gear 2910.

[0061] The second gear 299 is fixedly connected to the first gear 241 of the first drive member 24, and the third gear 2910 is fixedly connected to the fourth gear 251 of the second drive member 25. When the push-pull plate 293 drives the rotating seat 294 to move up and down, the first gear 297 can mesh with the second gear 299 or the third gear 2910 respectively to realize the switching of power transmission. If the teeth are not aligned, the spring 298 is compressed and stored. After the dial 295 rotates to align the teeth, the spring 298 is released to ensure that the teeth are tightly meshed and to ensure the stability of power transmission.

[0062] By cooperating with the limiting block 2911 and the limiting groove 2912, the vertical movement distance of the push-pull plate 293 can be limited, so that the push-pull plate 293 is limited when it moves to the designated position.

[0063] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A positionable bipolar radiofrequency ablation electrode, characterized in that: include, The handheld end (1) has an electrode needle (11) at its bottom. A hollow screw (2) is located in the inner cavity of the handheld end (1). A partition (21) is rotatably connected to the surface of the hollow screw (2) and fixedly connected to the inner wall of the handheld end (1). A threaded seat (22) is threadedly connected to the bottom of the hollow screw (2). A hollow tube (23) is connected to the bottom of the threaded seat (22) and fixedly connected to the electrode needle (11). A first driving member (24) is provided on one side of the threaded seat (22) for adjusting the extension and retraction length of the electrode needle (11). A second driving member (25) is provided on the other side of the threaded seat (22) for adjusting... The ablation range is defined by a through groove on the surface of the threaded seat (22), a lead screw (26) rotatably connected to the inner wall of the through groove, a drive block (27) threadedly connected to the surface of the lead screw (26), a sleeve (28) fixedly connected to one side of the drive block (27) and slidably connected to the threaded seat (22), a switching component (29) disposed between the first drive component (24) and the second drive component (25), a second electrode (12) fixedly connected to the bottom of the surface of the sleeve (28), a threading sleeve (3) fixedly connected to the top of the handheld end (1), and an adsorption component (31) disposed at the bottom of the second electrode (12) for adsorbing accumulated liquid and gas.

2. The positionable bipolar radiofrequency ablation electrode as described in claim 1, characterized in that: The first driving member (24) includes a gear one (241) disposed at the bottom of the partition (21), a gear two (242) meshing on one side of the gear one (241), the tops of the gear one (241) and the gear two (242) being rotatably connected to the partition (21), a gear three (243) meshing on one side of the gear two (242) and being fixedly connected to the hollow screw (2).

3. The positionable bipolar radiofrequency ablation electrode as described in claim 1 or 2, characterized in that: Both sides of the threaded seat (22) are fixedly connected to sliders (244), and both sides of the inner wall of the handheld end (1) are provided with grooves (245) that cooperate with the sliders (244).

4. The positionable bipolar radiofrequency ablation electrode as described in claim 3, characterized in that: The second drive unit (25) includes a gear four (251) fixedly connected to one side of the inner wall of the handheld end (1), a gear five (252) meshing with one side of the gear four (251), and fixedly connected to the lead screw (26).

5. The positionable bipolar radiofrequency ablation electrode as described in claim 1, 2, or 4, characterized in that: The switching component (29) includes a mounting groove (291) formed on the surface of the handheld end (1). Push-pull grooves (292) are formed on the top and bottom of one side of the handheld end (1) and are connected to the mounting groove (291). Push-pull plates (293) are slidably connected to the inner cavity of the push-pull grooves (292). A rotating seat (294) is rotatably connected to the side of the push-pull plate (293) away from the push-pull grooves (292). A dial (295) is rotatably connected to the surface of the rotating seat (294).

6. The positionable bipolar radiofrequency ablation electrode as described in claim 5, characterized in that: The top and bottom of the rotating seat (294) are fixedly connected to a support rod (296). A first face gear (297) is slidably connected to the surface of the support rod (296). A spring (298) is fixedly connected to the inner wall of the first face gear (297) and is fixedly connected to the support rod (296). A second face gear (299) is provided on the top of the first face gear (297). The top of the second face gear (299) is fixedly connected to a gear one (241). A third face gear (2910) is provided on the bottom of the first face gear (297). The bottom of the third face gear (2910) is fixedly connected to a gear four (251).

7. The positionable bipolar radiofrequency ablation electrode as described in claim 6, characterized in that: The surface of the push-pull plate (293) is fixedly connected to a limiting block (2911), and the inner wall of the push-pull groove (292) is provided with a limiting groove (2912), which cooperates with the limiting block (2911).

8. The positionable bipolar radiofrequency ablation electrode as described in claim 5, characterized in that: Both sides of the inner wall of the push-pull groove (292) are fixedly connected with abutment blocks (2913), and both sides of the push-pull plate (293) are provided with abutment grooves (2914), which cooperate with the abutment blocks (2913).

9. The positionable bipolar radiofrequency ablation electrode as described in claim 1, characterized in that: The adsorption component (31) includes a wire harness (311) disposed on the top of the wire sleeve (3). The bottom of the wire harness (311) passes through the wire sleeve (3), the handheld end (1), the hollow screw (2) and the hollow tube (23), and is fixedly connected to the electrode needle (11). The surface of the wire harness (311) is covered with an adsorption tube (312), and is fixedly connected to the inner wall of the hollow tube (23).

10. The positionable bipolar radiofrequency ablation electrode as described in claim 9, characterized in that: The surface of the hollow tube (23) is provided with a first adsorption hole (313), the surface of the adsorption tube (312) is provided with a second adsorption hole (314), the top of the adsorption tube (312) is connected to a negative pressure tube (315), one side of the negative pressure tube (315) passes through the threading sleeve (3) and extends to the outside of the threading sleeve (3).

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