Radiofrequency ablation electrode with multiple sub-needles extending from radiofrequency ablation rod

Abstract

The radiofrequency ablation electrode comprises a front ablation needle, the right end of the front ablation needle is connected with the left end of a front needle connecting rod, the front needle connecting rod is sleeved with a slidable sub-needle connecting pipe, the sub-needles are arranged in the circumferential direction of the left end of the sub-needle connecting pipe, and the sub-needles are arranged in the circumferential direction of the sub-needle connecting pipe. The child needle connecting pipe is sleeved with a slidable radiofrequency ablation rod, the left end of the radiofrequency ablation rod is an ablation rear needle, and the diameter of the front needle connecting rod is smaller than that of the ablation front needle. By means of the simple and stable structure, the problem that the ablation range of an existing single-needle radiofrequency ablation electrode is small is solved, the problem that the ablation range is uncontrollable due to the fact that the extending direction of the sub-needles of a multi-needle radiofrequency ablation electrode is uncertain is solved, and the multi-needle radiofrequency ablation electrode is practical, safe and reliable.

Description

Technical Field

[0001] The utility model relates to the field of medical instruments, and more specifically to a radio frequency ablation electrode with a plurality of sub-needles extending from a radio frequency ablation rod. Background Art

[0002] Radiofrequency ablation electrodes are often used to ablate and coagulate tissue at preset locations, causing them to necrotize. When existing single-needle radiofrequency ablation electrodes ablate tissues of different sizes at preset locations, they generally use radiofrequency ablation electrodes of different models and sizes, or adjust the parameters of the energy host. These methods can undoubtedly solve the problem of ablating tissues of different sizes at preset locations, but the operation method is too cumbersome, which will also waste surgical resources and increase financial pressure on patients. Some products have taken this into consideration and designed some multi-needle radiofrequency ablation electrodes that can adjust the ablation range. However, the uncertain extension direction of the sub-needles of the multi-needle radiofrequency ablation electrodes will cause the ablation range to be uncontrollable, and it is still unsafe when used. The utility model not only solves the problem that the existing single-needle radiofrequency ablation electrode has a small ablation range, but also solves the problem that the sub-needles of the multi-needle radiofrequency ablation electrodes have an uncertain extension direction, resulting in an uncontrollable ablation range. Utility Model Content

[0003] The utility model provides a radiofrequency ablation electrode with multiple sub-needles extending from a radiofrequency ablation rod, which not only solves the problem of small ablation range of the existing single-needle radiofrequency ablation electrode, but also solves the problem of uncontrollable ablation range caused by uncertain extension directions of the sub-needles of the multi-needle radiofrequency ablation electrode.

[0004] The technical solution adopted by the utility model to solve the above technical problems is:

[0005] A radiofrequency ablation electrode with multiple sub-needles extending from a radiofrequency ablation rod, including an ablation front needle, characterized in that the right end of the ablation front needle is connected to the left end of the front needle connecting rod, the front needle connecting rod is outer-mounted with a slidable sub-needle connecting tube, sub-needles are arranged in the circumferential direction of the left end of the sub-needle connecting tube, the sub-needle connecting tube is outer-mounted with a slidable radiofrequency ablation rod, the left end of the radiofrequency ablation rod is ablation rear needle, and the diameter of the front needle connecting rod is smaller than the diameter of the ablation front needle.

[0006] As described above, the horizontal position interval in which the ablation needle can slide is recorded as the ablation needle horizontal limit interval. When the ablation needle is located at the left end of the ablation needle horizontal limit interval, the left end of the ablation needle is located to the left of the right end of the pre-ablation needle; when the ablation needle is located at the right end of the ablation needle horizontal limit interval, the left end of the ablation needle is located to the right of the right end of the pre-ablation needle.

[0007] The horizontal position interval in which the sub-needle can slide is recorded as the sub-needle horizontal limit interval. When the sub-needle is located at the right end of the sub-needle horizontal limit interval, all of the sub-needles are located in the space between the inner wall of the radiofrequency ablation rod and the front needle connecting rod; when the sub-needle is located at the left end of the sub-needle horizontal limit interval, the left part of the sub-needle is located to the left of the right end of the front ablation needle.

[0008] When the left end of the post-ablation needle and the left part of the sub-needle are simultaneously located on the left side of the right end of the pre-ablation needle, the inner wall of the post-ablation needle and the outer wall of the pre-ablation needle are both against the sub-needle;

[0009] The left end of the sub-needle connecting tube is kept outside the right side of the needle before ablation.

[0010] The radiofrequency ablation electrode with multiple sub-needles extending from the radiofrequency ablation rod as described above also includes a handle, the left end of the handle is an opening, a rack accommodating cavity is arranged in the handle, the rack accommodating cavity is connected with the opening at the left end of the handle, a rack that can slide left and right along the length direction of the handle is installed in the rack accommodating cavity, and the rack extends along the length direction of the handle; a hollow sub-needle connecting tube fixing position is arranged at the left end of the rack;

[0011] The right end of the front needle connecting rod passes through the hollow part of the sub-needle connecting tube fixing position and the space corresponding to the rack in the rack accommodating cavity in sequence, and is fixed to the right end of the rack accommodating cavity;

[0012] The left end of the ablation front needle and the front needle connecting rod are located on the left side of the handle.

[0013] The right end of the sub-needle connecting tube is fixed on the sub-needle connecting tube fixing position.

[0014] As mentioned above, the right outer wall of the radiofrequency ablation rod is coated with epoxy resin, and the exposed portion on the left side of the radiofrequency ablation rod that is not coated with epoxy resin is the post-ablation needle.

[0015] As described above, a gear position is provided on the side wall of the handle corresponding to the rack, the knob portion of the upper part of the gear is located in the gear position, and the gear rack matching position at the lower part of the gear extends downward into the rack accommodating cavity and meshes with the teeth arranged on the rack.

[0016] As described above, the side wall of the handle is provided with an ablation range scale groove extending along the length direction of the handle, and the scale value is marked on the corresponding position of the ablation range scale groove on the side wall of the handle. A rack cylinder is provided on the side of the rack without teeth at the position corresponding to the ablation range scale groove. The diameter of the rack cylinder is smaller than the extension length of the ablation range scale groove, and the side wall of the rack cylinder is against the inner wall of the ablation range scale groove.

[0017] As described above, a locking knob is provided on the RF ablation rod, and the locking knob is located on the right side of the RF ablation rod. The left end of the locking knob is fixedly connected to the RF ablation rod, and the external thread on the right side of the locking knob matches the internal thread on the left inner wall of the handle.

[0018] As mentioned above, the front ablation needle, the front needle connecting rod, the sub-needle, and the rear ablation needle are all made of stainless steel.

[0019] As mentioned above, a radio frequency adapter is provided at the right end of the handle; the front needle connecting rod is electrically connected to the radio frequency adapter through a wire, and the radio frequency adapter is electrically connected to the host of the external radio frequency ablation treatment system through an external wire.

[0020] Compared with the prior art, the beneficial effects of the utility model are:

[0021] Compared with the structural devices of single-needle radiofrequency ablation electrodes and multi-needle radiofrequency ablation electrodes, the utility model adjusts the extension and retraction of multiple sub-needles through gears and racks, and makes the sub-needles work together with the front ablation needle and the rear ablation needle to control the radiofrequency ablation electrode's ablation range. The utility model has a simple, reasonable, effective, safe and convenient structure, and the ablation range is controllable in a fixed point and quantity. It not only solves the problem of the small ablation range of the existing single-needle radiofrequency ablation electrode, but also solves the problem of the uncontrollable ablation range caused by the uncertain extension direction of the sub-needles of the multi-needle radiofrequency ablation electrode. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the overall appearance of the utility model;

[0023] Figure 2 This is a schematic diagram of the internal structure of the utility model;

[0024] Figure 3 It is a schematic diagram of the ablation range scale groove of the utility model;

[0025] Figure 4 This is a schematic diagram of the matching structure of the gear, rack and sub-needle connecting tube of the utility model;

[0026] Figure 5 This is a schematic diagram of the front ablation needle structure of the utility model;

[0027] Figure 6 This is a schematic diagram of the connection relationship between the sub-needle and the sub-needle connecting tube of the utility model;

[0028] Among them, 1-ablation front needle, 101-front needle connecting rod, 2-sub-needle, 201-sub-needle connecting tube, 3-ablation rear needle, 4-RF ablation rod, 5-locking knob, 6-gear, 7-rack, 8-RF adapter, 9-rack accommodating cavity, 10-gear clamping position, 11-ablation range scale groove, 12-gear and rack matching position, 13-sub-needle connecting tube fixing position, 14-rack cylinder, 15-handle. DETAILED DESCRIPTION

[0029] In order to facilitate ordinary technicians in this field to understand and implement the present invention, the present invention is further described in detail below in conjunction with embodiments and drawings. It should be understood that the implementation examples described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0030] In the description of the present invention, it should be understood that the terms "upper", "lower", "left", "right", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0031] Example 1

[0032] like Figure 1 to Figure 6 As shown, a radiofrequency ablation electrode with multiple sub-needles extending from a radiofrequency ablation rod includes a handle 15, a front ablation needle 1, a sub-needle 2 and a radiofrequency ablation rod 4. The sub-needle 2, the front ablation needle 1 and the rear ablation needle 3 arranged at the left end of the radiofrequency ablation rod 4 work together to control the ablation range. The specific settings are as follows:

[0033] The right end of the ablation front needle 1 is connected to the left end of the front needle connecting rod 101. Figure 5 The front needle connecting rod 101 is covered with a slidable sub-needle connecting tube 201, and a sub-needle 2 is provided on the circumference of the left end of the sub-needle connecting tube 201, as shown in FIG. Figure 6 As shown, the sub-needle 2 is bent in the direction away from the front needle connecting rod 101; the sub-needle connecting tube 201 is outer-coated with a slidable radiofrequency ablation rod 4, the left end of the radiofrequency ablation rod 4 is the ablation rear needle 3, and the diameter of the front needle connecting rod 101 is smaller than the diameter of the ablation front needle 1.

[0034] The horizontal position interval in which the ablation needle 3 can slide is recorded as the ablation needle horizontal limit interval. When the ablation needle 3 is located at the left end of the ablation needle horizontal limit interval, the left end of the ablation needle 3 is located on the left side of the right end of the ablation needle 1, so that after the sub-needle 2 is extended, the inner wall of the ablation needle 3 and the outer wall of the ablation needle 1 are both against the sub-needle 2, thereby clamping the sub-needle 2; the ablation needle 3 is located at the right end of the ablation needle horizontal limit interval, and the left end of the ablation needle 3 is located on the right side of the right end of the ablation needle 1, so that the sub-needle 2 is extended from the ablation needle 3;

[0035] The horizontal position interval in which the sub-needle 2 can slide is recorded as the sub-needle horizontal limit interval. When the sub-needle 2 is located at the right end of the sub-needle horizontal limit interval, the sub-needle 2 is completely located in the space between the inner wall of the radiofrequency ablation rod 4 and the front needle connecting rod 101. When the sub-needle 2 is located at the left end of the sub-needle horizontal limit interval, the left part of the sub-needle 2 is located to the left of the right end of the front ablation needle 1.

[0036] When the left end of the post-ablation needle 3 and the left part of the sub-needle 2 are simultaneously located on the left side of the right end of the pre-ablation needle 1, the inner wall of the post-ablation needle 3 and the outer wall of the pre-ablation needle 1 are both against the sub-needle 2;

[0037] The left end of the sub-needle connecting tube 201 is kept on the right side of the needle 1 before ablation.

[0038] In order to facilitate the control of the position of the sub-needle 2 and the radiofrequency ablation rod 4 relative to the front ablation needle 1, a handle 15 is provided:

[0039] The left end of the handle 15 is open, and a rack accommodating cavity 9 extending along the length direction of the handle 15 is provided in the handle 15. The rack accommodating cavity 9 is communicated with the left end opening of the handle 15. A rack 7 that can slide left and right along the length direction of the handle 15 is installed in the rack accommodating cavity 9, and the rack 7 extends along the length direction of the handle 15; a hollow sub-needle connecting tube fixing position 13 is provided at the left end of the rack 7;

[0040] The right end of the front needle connecting rod 101 passes through the hollow part of the sub-needle connecting tube fixing position 13 and the space corresponding to the rack 7 in the rack accommodating cavity 9 in sequence, and is fixed to the right end of the rack accommodating cavity 9;

[0041] The left end of the ablation front needle 1 and the front needle connecting rod 101 are located outside the left side of the handle 15.

[0042] The right end of the sub-needle connecting tube 201 is fixed to the sub-needle connecting tube fixing position 13;

[0043] When the rack 7 is located at the right end of the rack accommodating cavity 9, the sub-needle 2 is located at the right end of the sub-needle horizontal limit interval; when the rack 7 is located at the left end of the rack accommodating cavity 9, the sub-needle 2 is located at the left end of the sub-needle horizontal limit interval.

[0044] The post-ablation needle 3 is also hollow and the cavity of the post-ablation needle 3 is connected to the cavity of the radiofrequency ablation rod 4. In this embodiment, the radiofrequency ablation rod 4 is made of conductive material, and a layer of epoxy resin is applied to the right outer wall of the radiofrequency ablation rod 4 by using an insulating spraying process, and the exposed part of the radiofrequency ablation rod 4 on the left side without epoxy resin is used as the post-ablation needle 3, wherein the epoxy resin is used for insulation on the one hand and for reducing tissue puncture resistance on the other hand; in this utility model, the post-ablation needle 3, the pre-ablation needle 1 and the sub-needle 2 are used to ablate the tissue at the preset position together.

[0045] In order to finely adjust the position of the rack 7, a gear clamping position 10 is provided on the side wall of the handle 15 at a position corresponding to the rack 7. The knob portion of the upper portion of the gear 6 is located in the gear clamping position 10, and the gear rack matching position 12 at the lower portion of the gear 6 extends downward into the rack accommodating cavity 9 and meshes with the tooth pattern provided on the rack 7. Figure 2 and Figure 4 shown.

[0046] In order to fix and check the extended length of the sub-needle connecting tube 201 (i.e., to fix and check the extended length of the sub-needle 2), an ablation range scale groove 11 extending along the length direction of the handle 15 is opened on the side wall of the handle 15, and the scale value is marked on the corresponding position of the ablation range scale groove 11 on the side wall of the handle 15. A rack cylinder 14 is provided on the side of the rack 7 where no teeth are provided and at the corresponding position of the ablation range scale groove 11. The diameter of the rack cylinder 14 is smaller than the extended length of the ablation range scale groove 11, so that the rack cylinder 14 can slide in the ablation range scale groove 11 along the length direction of the handle 15, and the side wall of the rack cylinder 14 is abutted against the inner wall of the ablation range scale groove 11. When the rack 7 slides left and right, the extended length of the sub-needle 2 is determined by observing the scale value corresponding to the rack cylinder 14, and the relative position of the rack 7 in the rack accommodating cavity 9 is maintained by the friction between the rack cylinder 14 and the ablation range scale groove 11.

[0047] In order to fix the position of the sub-needle 2 and prevent the sub-needle 2 from shifting due to the accidental contact with the gear 6 during the ablation process, a locking knob 5 is provided. The locking knob 5 is sleeved on the RF ablation rod 4 and is located on the right side of the RF ablation rod 4. The left end of the locking knob 5 is fixedly connected to the RF ablation rod 4. The outer wall on the right side of the locking knob 5 is provided with an external thread, and the external thread of the locking knob 5 matches the internal thread provided on the left inner wall of the handle 15. When the locking knob 5 is rotated, the locking knob 5 moves along the length direction of the handle 15, and the RF ablation rod 4 rotates with the locking knob 5 and moves along the length direction of the handle 15. When the RF ablation rod 4 moves to a position where the sub-needle 2 is stuck between the ablation rear needle 3 and the ablation front needle 1, the sub-needle 2 can be fixed.

[0048] The ablation front needle 1, the front needle connecting rod 101, the sub-needle 2, the sub-needle connecting tube 201 and the ablation rear needle 3 are all made of conductive materials, such as stainless steel; when the sub-needle 2 is stuck between the ablation rear needle 3 and the ablation front needle 1, the front needle connecting rod 101 conducts electricity to the ablation front needle 1, the sub-needle 2 and the ablation rear needle 3 in turn, so that the ablation front needle 1, the sub-needle 2 and the ablation rear needle 3 are ablated together.

[0049] The gear 6, the rack 7, the locking knob 5, and the handle 15 are all made of insulating materials, such as high molecular polymer.

[0050] The right end of the handle 15 is provided with a pluggable radio frequency adapter 8; the front needle connecting rod 101 is electrically connected to the radio frequency adapter 8 through a wire, and the radio frequency adapter 8 is electrically connected to the host of the external radio frequency ablation treatment system through an external wire.

[0051] Example 2

[0052] The method for installing a radiofrequency ablation electrode having multiple sub-needles extending from a radiofrequency ablation rod described in Example 1 is based on the following sequence:

[0053] Install the gear 6 from the rack accommodating cavity 9 into the gear clamping position 10;

[0054] Fix the right end of the front ablation needle 1 in the rack accommodating cavity 9 of the handle 15;

[0055] After the rack 7 with the sub-needle connection tube fixing position 13 is installed on the electrode ablation front needle 1, it is installed in the rack accommodating cavity 9, and the teeth of the rack 7 are meshed with the teeth of the gear 6, and the rack cylinder 14 on the rack 7 is stuck in the ablation range scale groove 11;

[0056] The sub-needle connecting tube 201 with the sub-needle 2 is sleeved on the front ablation needle 1, and the radiofrequency ablation rod 4 and the locking knob 5 are sleeved on the sub-needle connecting tube 201 in sequence;

[0057] Fix the right end of the sub-needle connecting tube 201 on the sub-needle connecting tube fixing position 13;

[0058] The right end of the radiofrequency ablation rod 4 is bonded and fixed to the locking knob 5. Figure 2 As shown;

[0059] Install the locking knob 5 to the position corresponding to the internal thread at the left end of the handle 15.

[0060] Example 3

[0061] A method for using a radiofrequency ablation electrode having a plurality of sub-needles extending from a radiofrequency ablation rod as described in Example 1:

[0062] First, the gear 6 is used to move the sub-needle 2 to the right end of the sub-needle horizontal limit interval, and the locking knob 5 is used to move the post-ablation needle 3 to the right end of the post-ablation needle horizontal limit interval;

[0063] According to the preset position of the tissue to be ablated, the pre-ablation needle 1 is inserted into the tissue by holding the handle 15;

[0064] According to the size of the tissue, the gear 6 is twisted to adjust the rack 7 to slide left and right, driving the needle 2 to extend and retract, thereby adjusting the extension length of the needle 2;

[0065] After the sub-needle 2 reaches the predetermined position, the locking knob 5 is turned to move the RF ablation rod 4 to the left, and the ablation rear needle 3 and the ablation front needle 1 on the left side of the RF ablation rod 4 are used to clamp the middle sub-needle 2 to prevent the sub-needle 2 from shifting during the ablation process;

[0066] The pre-ablation needle 1, the post-ablation needle 3 and the sub-needle 2 begin to ablate the corresponding tissues;

[0067] After the tissue ablation is completed, the locking knob 5 is turned to adjust the rack 7 to the right end of the rack accommodating cavity 9. At this time, the sub-needle 2 is completely retracted into the radiofrequency ablation rod 4. The needle 1 can perform needle tract ablation before ablation to prevent needle tract infection.

[0068] After the needle tract ablation is completed, the handle 15 is pulled outwards so that the pre-ablation needle 1 is pulled out from the tissue.

[0069] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A radiofrequency ablation electrode having a plurality of sub-needles extending from a radiofrequency ablation rod, comprising a front ablation needle (1), characterized in that: The right end of the front ablation needle (1) is connected to the left end of the front needle connecting rod (101), the front needle connecting rod (101) is covered with a slidable sub-needle connecting tube (201), a sub-needle (2) is arranged in the circumferential direction of the left end of the sub-needle connecting tube (201), the sub-needle connecting tube (201) is covered with a slidable radiofrequency ablation rod (4), the left end of the radiofrequency ablation rod (4) is the rear ablation needle (3), and the diameter of the front needle connecting rod (101) is smaller than the diameter of the front ablation needle (1).

2. The radiofrequency ablation electrode having a plurality of sub-needles extending from a radiofrequency ablation rod according to claim 1, characterized in that: The horizontal position interval in which the ablation needle (3) can slide is recorded as the ablation needle horizontal limit interval. When the ablation needle (3) is located at the left end of the ablation needle horizontal limit interval, the left end of the ablation needle (3) is located to the left of the right end of the ablation needle (1); when the ablation needle (3) is located at the right end of the ablation needle horizontal limit interval, the left end of the ablation needle (3) is located to the right of the right end of the ablation needle (1). The horizontal position interval in which the sub-needle (2) can slide is recorded as the sub-needle horizontal limit interval. When the sub-needle (2) is located at the right end of the sub-needle horizontal limit interval, the sub-needle (2) is completely located in the space between the inner wall of the radiofrequency ablation rod (4) and the front needle connecting rod (101); when the sub-needle (2) is located at the left end of the sub-needle horizontal limit interval, the left part of the sub-needle (2) is located to the left of the right end of the front ablation needle (1); When the left end of the post-ablation needle (3) and the left part of the sub-needle (2) are simultaneously located to the left of the right end of the pre-ablation needle (1), the inner wall of the post-ablation needle (3) and the outer wall of the pre-ablation needle (1) are both against the sub-needle (2); The left end of the sub-needle connecting tube (201) is kept outside the right side of the needle (1) before ablation.

3. The radiofrequency ablation electrode having a plurality of sub-needles extending from a radiofrequency ablation rod according to claim 1, characterized in that: The device also comprises a handle (15), the left end of the handle (15) is open, a rack accommodating cavity (9) is arranged in the handle (15), the rack accommodating cavity (9) is communicated with the left end opening of the handle (15), a rack (7) which can slide leftward and rightward along the length direction of the handle (15) is installed in the rack accommodating cavity (9), and the rack (7) extends along the length direction of the handle (15); a hollow sub-needle connecting tube fixing position (13) is arranged at the left end of the rack (7); The right end of the front needle connecting rod (101) passes through the hollow portion of the sub-needle connecting tube fixing position (13) and the space corresponding to the rack (7) in the rack accommodating chamber (9) in sequence, and is fixed to the right end of the rack accommodating chamber (9); The left end of the ablation front needle (1) and the front needle connecting rod (101) are located outside the left side of the handle (15). The right end of the sub-needle connecting tube (201) is fixed on the sub-needle connecting tube fixing position (13).

4. The radiofrequency ablation electrode having a plurality of sub-needles extending from a radiofrequency ablation rod according to claim 1, characterized in that: The right outer wall of the radiofrequency ablation rod (4) is coated with epoxy resin, and the exposed portion on the left side of the radiofrequency ablation rod (4) that is not coated with epoxy resin is the post-ablation needle (3).

5. The radiofrequency ablation electrode with multiple sub-needles extending from a radiofrequency ablation rod according to claim 3, characterized in that: A gear clamping position (10) is provided on the side wall of the handle (15) at a position corresponding to the rack (7); the knob portion of the upper portion of the gear (6) is located in the gear clamping position (10); and the gear rack matching position (12) at the lower portion of the gear (6) extends downward into the rack accommodating cavity (9) and meshes with the tooth pattern provided on the rack (7).

6. The radiofrequency ablation electrode having a plurality of sub-needles extending from a radiofrequency ablation rod according to claim 3, characterized in that: The side wall of the handle (15) is provided with an ablation range scale groove (11) extending along the length direction of the handle (15); a scale value is marked on the side wall of the handle (15) at a corresponding position of the ablation range scale groove (11); a rack cylinder (14) is provided on a side of the rack (7) where no tooth pattern is provided at a position corresponding to the ablation range scale groove (11); the diameter of the rack cylinder (14) is smaller than the extension length of the ablation range scale groove (11); and the side wall of the rack cylinder (14) abuts against the inner wall of the ablation range scale groove (11).

7. The radiofrequency ablation electrode with multiple sub-needles extending from a radiofrequency ablation rod according to claim 3, characterized in that: The radiofrequency ablation rod (4) is sleeved with a locking knob (5), which is located on the right side of the radiofrequency ablation rod (4). The left end of the locking knob (5) is fixedly connected to the radiofrequency ablation rod (4), and the external thread arranged on the right side of the locking knob (5) matches the internal thread arranged on the left inner wall of the handle (15).

8. The radiofrequency ablation electrode with multiple sub-needles extending from a radiofrequency ablation rod according to claim 1, characterized in that: The front ablation needle (1), the front needle connecting rod (101), the sub-needle (2), and the rear ablation needle (3) are all made of stainless steel.

9. The radiofrequency ablation electrode with multiple sub-needles extending from a radiofrequency ablation rod according to claim 3, characterized in that: A radio frequency adapter (8) is provided at the right end of the handle (15); the front needle connecting rod (101) is electrically connected to the radio frequency adapter (8) via a wire, and the radio frequency adapter (8) is electrically connected to a host of an external radio frequency ablation treatment system via an external wire.

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