A movable electrode assembly for achieving controllable irreversible electroporation ablation volume

Abstract

The present invention provides a movable electrode assembly for realizing controllable irreversible electroporation ablation volume, the electrode assembly comprises a hollow electrode needle, the surface of the electrode needle near the first end is evenly distributed with a plurality of strip-shaped outlets; the interior of the hollow electrode needle comprises a first cylinder and a second cylinder; the second cylinder can control the first cylinder to move up and down in the hollow electrode needle; the surface of the first cylinder is connected with a plurality of electrodes, when the second cylinder drives the first cylinder to rotate in a first direction, the plurality of electrodes extend from the strip-shaped outlets, when the second cylinder drives the first cylinder to rotate in a second direction, the plurality of electrodes retract from the strip-shaped outlets into the interior of the hollow electrode needle. The above scheme solves the technical problem that the controllable range of electroporation ablation volume is too small in the prior art.

Description

Technical Field

[0001] The present invention relates to the field of medical instruments, and in particular to a movable electrode assembly for achieving controllable irreversible electroporation ablation volume. Background Art

[0002] Electroporation is a novel ablation technique that has the potential to overcome the major drawbacks of other ablation methods. It uses electrical pulses propagated between two or more electrodes to form "nanopores" in cell membranes. If the applied current reaches a certain threshold, these nanopores become permanent, resulting in cell death. Irreversible electroporation (IRE) has been shown to effectively and safely destroy tumor cells while preserving tissue architecture and minimizing damage to blood vessels and important urothelial structures such as neurovascular bundles.

[0003] One method of implementing irreversible electroporation is to insert an electrode needle into the target location for treatment. Currently, a more popular electrode is a multi-tip expandable electrode needle, which is an expandable radiofrequency electrode with multiple needle tips extending from a central cannula, in an umbrella or anchor shape, such as Figure 1 As shown, the unfolded curvature radius can be adjusted according to the tumor size, so as to achieve the purpose of controlling the ablation volume. However, the ablation volume adjustment in the prior art is limited to the curvature radius of the electrode, and the ablation volume adjustment is limited to radial adjustment, and longitudinal adjustment is not possible, and the adjustment range is still limited. Summary of the invention

[0004] In order to solve the above problems in the background technology, the present invention provides a movable electrode assembly for achieving controllable irreversible electroporation ablation volume.

[0005] In one aspect of the present invention, a movable electrode assembly for achieving a controllable irreversible electroporation ablation volume is provided, characterized in that: the electrode assembly comprises a hollow electrode needle (101), the first end of the hollow electrode needle (101) is closed, and a plurality of strip-shaped outlets (102) are evenly distributed on the surface of the electrode needle near the first end; the interior of the hollow electrode needle (101) comprises a first column (201) and a second column (202); the first column (201) is close to the first end of the hollow electrode needle (101) , the second column (202) is far away from the first end of the hollow electrode needle (101); the diameter of the first column (201) is larger than that of the second column (202); the height of the first column (201) is much smaller than that of the second column (202); the sum of the height of the first column (201) and the height of the second column (202) is greater than the height of the hollow electrode needle (101); the second column (202) can control the rotation of the first column (2 ... 1) moving up and down in the hollow electrode needle (101); a plurality of electrodes (203) are connected to the surface of the first column (201), and the number of the electrodes (203) is the same as the number of the strip-shaped outlets (102); when the second column (202) drives the first column (201) to rotate in a first direction, the plurality of electrodes (203) extend from the strip-shaped outlets (102), wherein each electrode (203) corresponds to one strip-shaped outlet (102); the second column (202) drives the first When the column (201) rotates in the second direction, the multiple electrodes (203) retract from the strip-shaped outlet (102) into the interior of the hollow electrode needle (101); the second column (202) can control the first column (201) to move away from the first end in the hollow electrode needle (101), and when the second column (202) drives the first column (201) to rotate in the first direction, the multiple electrodes (203) extend from the strip-shaped outlet (102), and the extension position is away from the first end.

[0006] Furthermore, the strip-shaped outlet (102) is covered by a flexible material (103), and the electrode (203) can pass through the flexible material (103) to the outside of the hollow electrode needle (101).

[0007] Furthermore, the flexible material (103) covers the strip-shaped outlet (102) along the same direction.

[0008] Furthermore, the inner wall of the hollow electrode needle (101) comprises a limit baffle, and the limit baffle limits the rotation range of the first column (201).

[0009] Furthermore, the electrode assembly further comprises a third column (301) and a fourth column (302); the third column (301) and the fourth column (302) are hollow and concentrically sleeved on the second column (202); the diameter of the third column (301) is larger than that of the fourth column (302), and the height of the third column (301) is much smaller than that of the fourth column (302); the fourth column (302) can control the rotation of the third column (301); the fourth column (302) can control the up and down movement of the third column (301) in the hollow electrode needle (101); a plurality of electrodes (303) are connected to the surface of the third column (301), and the number of the electrodes (303) is the same as that of the strip-shaped outlet (102); the fourth column (302) drives the third column (301) to rotate; When the column (301) rotates in a first direction, the multiple electrodes (303) extend from the strip-shaped outlet (102), wherein each of the electrodes (303) corresponds to one strip-shaped outlet (102); when the fourth column (302) drives the third column (301) to rotate in a second direction, the multiple electrodes (303) retract from the strip-shaped outlet (102) into the interior of the hollow electrode needle (101); after the fourth column (302) can control the third column (301) to move away from one end in the hollow electrode needle (101), when the fourth column (302) drives the third column (301) to rotate in the first direction, the multiple electrodes (303) extend from the strip-shaped outlet (102), and the extending position is away from the first end.

[0010] Furthermore, the electrode assembly also includes a plurality of structures having a similar shape to the third column (301) and the fourth column (302) but different sizes, which are concentrically sleeved in sequence.

[0011] Furthermore, the hollow electrode needle (101) comprises a plurality of first cylinders (201), each of which has a central circular hole at its center for the second cylinder (202) to pass through, and each central circular hole has at least one slot at its edge; the second cylinder (202) comprises a plurality of groups of spring sheets, the number of spring sheet groups being the same as the number of the first cylinders (201), and each group of spring sheets can be independently ejected or retracted; when any group of spring sheet groups is ejected, it can be engaged with the slot of one of the plurality of first cylinders (201); after engagement, the second cylinder (202) can control the rotation and up and down movement of the engaged first cylinder (201).

[0012] Furthermore, a friction force is provided between the inner wall of the hollow electrode needle (101) and the first column (201), and when the first column (201) is moved, the first column (201) will not move automatically unless an external force is applied.

[0013] Furthermore, each card slot of the plurality of first columns (201) is provided with a sensor, and the sensor can collect a signal indicating whether the card slot is engaged, and send the signal indicating whether the card slot is engaged to the console.

[0014] Furthermore, the console can display the relative positions of the first column (201), the second column (202) and the hollow electrode needle (101).

[0015] The present invention adopts the above technical solution, designs multiple column components in the ablation needle, designs openings on the needle surface, and uses the ablation needle to perform longitudinal adjustment to expand the controllable treatment volume of irreversible electroporation. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 , a movable electrode for controllable irreversible electroporation ablation volume in the prior art;

[0018] Figure 2 , Schematic diagram of the hollow electrode needle and outlet;

[0019] Figure 3 ,Schematic diagram of flexible material covering;

[0020] Figure 4 , schematic diagram of electrodes penetrating through the flexible material covering;

[0021] Figure 5 , schematic diagram of the first column and the second column located in the schematic diagram of the hollow electrode needle;

[0022] Figure 6 , schematic diagrams of the first column and the second column;

[0023] Figure 7 , schematic diagram of the electrode passing through the hollow electrode needle at the bottom;

[0024] Figure 8 , schematic diagram of a hollow electrode needle with the electrode passing through the middle;

[0025] Fig. 9 , schematic diagrams of the third column and the fourth column;

[0026] Fig.10 , schematic diagrams of multiple first cylinders;

[0027] Fig.11, schematic diagram of the card slot in the first column;

[0028] Fig.12 , schematic diagram of the shrapnel in the second column. DETAILED DESCRIPTION

[0029] Below, the invention is preferably described in conjunction with the accompanying drawings and specific implementation methods.

[0030] This embodiment solves the above problems through the following implementation methods:

[0031] like Figure 2 As shown, the electrode assembly includes a hollow electrode needle 101. Since the electrode needle needs to be inserted into the target area, the first end of the hollow electrode needle 101 is closed; further, in order to facilitate insertion into the target area, the first end can be in the shape of a spike (not shown in the figure); in order to facilitate the electrode to pass through the hollow electrode needle 101, a plurality of strip-shaped outlets 102 are evenly distributed on the surface of the electrode needle close to the first end, wherein the length of the strip-shaped outlet 102 is the range within which the electrode can move up and down; further, in order to prevent human tissue and tissue fluid from entering the electrode needle, the strip-shaped outlet 102 can be covered by a flexible material 103, and the electrode can pass through the flexible material 103; further, as Figure 3 As shown in FIG. 1 , it is a cross-sectional view of a hollow electrode needle 101 with multiple strip-shaped outlets 102, wherein the strip-shaped outlets 102 are covered by a flexible material 103 along the same direction (for the convenience of illustration, the opening of the outlet 102 shown in the figure is relatively large, and in reality the opening 102 is completely covered by the flexible material 103); Figure 4 As shown, when the first cylinder 201 rotates in the first direction, the electrode 203 passes through the strip-shaped outlet 102 (in order to simplify the diagram, Figure 4 Only one electrode 203 is shown in the figure, and in actual operation, all electrodes 203 are simultaneously passed through their corresponding strip outlets 102).

[0032] like Figure 5As shown, the hollow electrode needle 101 includes a first cylinder 201 and a second cylinder 202; the first cylinder 201 is close to the first end of the hollow electrode needle 101, and the second cylinder 202 is far away from the first end of the hollow electrode needle 101. The diameter of the first cylinder 201 is larger than that of the second cylinder 202, and the height of the first cylinder 201 is much smaller than that of the second cylinder 202. The sum of the height of the first cylinder 201 and the height of the second cylinder 202 is greater than the height of the hollow electrode needle 101; the second cylinder 202 can control the rotation of the first cylinder 201, and the second cylinder 202 can control the first cylinder 201 to move up and down in the hollow electrode needle 101. The first cylinder 201 is a flat cylinder, which fits closely to the inside of the hollow electrode needle 101, with a diameter close to that of the hollow electrode needle 101, and is located at one end of the needle tip, and its main function is to control the electrode 203; the second cylinder 202 is an elongated cylinder, which is connected to the first cylinder 201, and is used to control the rotation and up and down movement of the first cylinder 201; the sum of the height of the first cylinder 201 and the height of the second cylinder 202 is greater than the height of the hollow electrode needle 101, so a part of the second cylinder 202 extends out of the second end of the hollow electrode needle 101, and the rotation and up and down movement of the second cylinder 202 can be controlled by a motor or manual structure, and the control switch can be located at the operating table or the handle of the ablation needle, etc. The specific control method is not limited by the present invention, as long as the relevant functions can be achieved.

[0033] like Figure 6 As shown, the surface of the first column 201 is connected with a plurality of electrodes 203 ( Figure 6 Only one is shown in the figure), each electrode corresponds to one outlet and is rotated out of only this one corresponding outlet, so the number of the electrodes 203 is the same as the number of the strip outlets 102.

[0034] like Figure 4 as well as Figure 7 As shown, when the second cylinder 202 drives the first cylinder 201 to rotate in the first direction (the first direction can be clockwise or counterclockwise, in the present invention, when the first direction is clockwise, the second direction is counterclockwise, and vice versa), the plurality of electrodes 203 extend from the strip-shaped outlet 102 (102), wherein each of the electrodes 203 corresponds to one strip-shaped outlet 102. Since the electrodes 203 are fixed to the surface of the first cylinder 201, when the second cylinder 202 drives the first cylinder 201 to rotate in the second direction, the plurality of electrodes 203, due to rotation, adhere to the surface of the first cylinder 201, and thus the electrodes retract from the strip-shaped outlet 102 into the interior of the hollow electrode needle 101.

[0035] like Figure 8As shown, the second column 202 can control the first column 201 to move away from the one end in the hollow electrode needle 101; specifically, as in Figure 8 In the embodiment, the second column 202 moves the first column 201 upward; when the second column 202 drives the first column 201 to rotate in the first direction, the plurality of electrodes 203 extend from the strip-shaped outlet 102, and the extending position is far away from the first end; at the same time, referring to Figure 7 as well as Figure 8 , since the second cylinder 202 moves upward, when the electrode 203 rotates out, Figure 8 The middle electrode is located above Figure 7 The position of the middle electrode.

[0036] Furthermore, due to the limited length of the electrode 203, in order to prevent excessive rotation, a limit baffle is provided on the inner wall of the hollow electrode needle 101 (101), and the limit baffle limits the rotation range of the first cylinder 201. The maximum angle of rotation of the second cylinder 202 along the first direction is that the electrode 203 is completely rotated out, and the maximum angle of rotation of the second cylinder 202 along the second direction is that the electrode 203 is completely rotated into the hollow electrode needle 101.

[0037] Through the above-mentioned implementation, since the height of the electrode extension position is adjustable, the depth of electroporation can be adjusted. In actual operation, after the electrode needle is inserted into the target position, the first cylinder 201 is kept at the end close to the needle tip, and then the electrode is rotated out for the first treatment. Subsequently, the electrode is rotated into the needle, and the first cylinder 201 is moved to a position away from the needle tip, and the electrode is rotated out again for the second treatment. Similarly, more treatments at different depths can be performed. Repeatedly, multiple treatments can be performed at different depths, reducing the number of punctures, thereby reducing surgical risks and alleviating the patient's pain.

[0038] Based on the above implementation, further, Fig. 9 As shown, the electrode assembly further includes a third column 301 and a fourth column 30; Fig. 9 As shown, the third and fourth cylinders are represented by dotted lines different from the first and second cylinders 202. The third and fourth cylinders are hollow and concentrically sleeved on the second cylinder 202, so the third and fourth cylinders can rotate and move up and down independently. Similar to the first cylinder 201 and the second cylinder 202, the diameter of the third cylinder is larger than that of the fourth cylinder, and the height of the third cylinder is much smaller than that of the fourth cylinder; the fourth cylinder can control the rotation of the third cylinder; the fourth cylinder can control the up and down movement of the third cylinder in the hollow electrode needle 101; the surface of the third cylinder is connected with a plurality of electrodes 303 ( Fig. 9Only one is shown, and the other electrodes are similarly distributed on the third cylinder), the number of electrodes 303 is the same as the strip outlet 102; when the fourth cylinder drives the third cylinder to rotate in the first direction, the multiple electrodes 303 extend from the strip outlet 102, wherein each of the electrodes 303 corresponds to one strip outlet 102; when the fourth cylinder drives the third cylinder to rotate in the second direction, the multiple electrodes 303 retract from the strip outlet 102 into the hollow electrode needle 101; after the fourth cylinder can control the third cylinder to move away from the one end in the hollow electrode needle 101, when the fourth cylinder drives the third cylinder to rotate in the first direction, the multiple electrodes 303 extend from the strip outlet 102, and the extending position is away from the first end.

[0039] Through the above implementation, after the electrode needle is inserted into the target position, the second column 202 and the fourth column can be used to simultaneously adjust the electrode opening and the electrode depth, thereby achieving the purpose of more conveniently controlling the ablation volume.

[0040] Based on the above embodiment, further, multiple structures similar to the third and fourth cylinders (similar in shape but different in size) can be added and concentrically sleeved in sequence, so that adjustment can be more convenient. For example, four structures identical to the third cylinder are concentrically sleeved, and four structures similar to the fourth cylinder are concentrically sleeved, and the elongated cylinder can control the flat cylinder in a similar manner.

[0041] Based on the above implementation, further, Fig.10 As shown, the hollow electrode needle 101 includes a plurality of first cylinders 201. Fig.10 In the embodiment, different first cylinders 201 are represented by different dotted lines (the second cylinder 202 is not shown), and the function of each first cylinder 201 is the same as that in the above-mentioned embodiment, and the second cylinder 202 can control the rotation and movement of the plurality of first cylinders 201. Fig.11 As shown, each first cylinder 201 has a central circular hole for the second cylinder 202 to pass through, and each central circular hole has at least one slot 401 ( Fig.11 The example in the figure is two card slots 401); the second column 202 includes multiple groups of spring pieces, and the number of spring piece groups is the same as the number of the first column 201, such as Fig.12 As shown, corresponding to Fig.11 In the case of two card slots 401, four groups of spring sheets are included, each group of spring sheets is composed of two spring sheets 402, and each group of spring sheets can be independently popped out or retracted on the outside (such as the external handle of the electrode needle or the control console) through a spring structure or an electromagnetic structure. The specific scheme for controlling the pop-up and retraction is not limited as long as the relevant functions can be achieved.

[0042] Exemplarily, the bottom group of spring pieces of the second cylinder 202 is controlled to pop out, and the other spring pieces are contracted. Then, the bottom first cylinder 201 can be made to pop out the electrode by rotating the second cylinder 202, and the other first cylinders 201 are not controlled. Of course, the first and third groups of spring pieces can also be popped out at the same time, and the first and third groups of first cylinders 201 can be rotated, and the second and fourth cylinders remain stationary.

[0043] The above technical features can realize the rotation of the first column 201 at any different depths, thereby conveniently realizing perforation treatment at different depths, thereby controlling the ablation volume in the longitudinal direction.

[0044] Based on the above embodiment, further, a group of spring pieces in the second column 202 are ejected and stuck in the slot 401 of any first column 201, and the corresponding first column 201 can be controlled to move up and down. Exemplarily, the bottom group of spring pieces of the second column 202 is controlled to be ejected, and the other spring pieces are contracted, so that the bottom first column 201 and other columns located on the first column 201 can be moved upward, so that a more flexible longitudinal ablation volume can be achieved.

[0045] Furthermore, a certain friction force is set between the inner wall of the hollow electrode needle 101 and the first cylinder 201. When the first cylinder 201 is moved, if no external force is applied, the first cylinder 201 will not move automatically. Exemplarily, the group of springs at the bottom (closest to the needle tip) is controlled to pop out, and the other springs are contracted; when the second cylinder 202 moves upward, the bottom first cylinder 201 and the other first cylinders 201 thereon are all moved upward, and after moving to the preset position, the bottom first cylinder 201 is moved again to be close to the needle tip, and the other first cylinders 201 remain in place.

[0046] Through the above solution, the doctor or surgical operator can arbitrarily move the first column 201 to achieve the purpose of obtaining an ablation volume of any shape.

[0047] Furthermore, each of the card slots 401 of the plurality of first columns 201 is provided with a sensor, and the sensor can collect a signal indicating whether the card slot 401 is engaged, and send the signal indicating whether the card slot 401 is engaged to the console.

[0048] Through the above technical solution, doctors or surgical operators can determine which column they are operating to avoid operating errors.

[0049] Furthermore, in order to facilitate determination of the specific position of the first column 201 and the engagement relationship between the first column 201 and the second column 202 , the console may display the relative positions of the first column 201 , the second column 202 and the hollow electrode needle 101 ( 101 ).

[0050] Through the above technical solution, doctors or surgical operators can determine which spring piece they are using to operate which column to avoid operating errors.

[0051] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

[0052] The present invention does not particularly specify the structure of some modules, which shall be subject to the contents recorded in the prior art. The prior art mentioned in the above background technology section and the specific embodiment section of the present invention can be used as part of the present invention to understand the meaning of some technical features or parameters. The scope of protection of the present invention shall be subject to the contents actually recorded in the claims.

Claims

1. A movable electrode assembly for achieving controllable irreversible electroporation ablation volume, characterized in that: The electrode assembly comprises a hollow electrode needle (101), the first end of the hollow electrode needle (101) is closed, and a plurality of strip-shaped outlets (102) are evenly distributed on the surface of the electrode needle close to the first end; The hollow electrode needle (101) comprises a first column (201) and a second column (202); the first column (201) is close to the first end of the hollow electrode needle (101), and the second column (202) is far away from the first end of the hollow electrode needle (101); the diameter of the first column (201) is greater than that of the second column (202), the height of the first column (201) is much smaller than that of the second column (202), and the sum of the height of the first column (201) and the height of the second column (202) is greater than the height of the hollow electrode needle (101); the second column (202) can control the rotation of the first column (201); the second column (202) can control the first column (201) to move up and down in the hollow electrode needle (101); a plurality of electrodes (203) are connected to the surface of the first column (201), and the number of the electrodes (203) is equal to or greater than that of the hollow electrode needle (101). The strip-shaped outlets (102) are the same; when the second column (202) drives the first column (201) to rotate in a first direction, the multiple electrodes (203) extend from the strip-shaped outlet (102), wherein each of the electrodes (203) corresponds to one strip-shaped outlet (102); when the second column (202) drives the first column (201) to rotate in a second direction, the multiple electrodes (203) retract from the strip-shaped outlet (102) into the interior of the hollow electrode needle (101); after the second column (202) can control the first column (201) to move away from the first end in the hollow electrode needle (101), when the second column (202) drives the first column (201) to rotate in the first direction, the multiple electrodes (203) extend from the strip-shaped outlet (102), and the extending position is away from the first end; The hollow electrode needle (101) comprises a plurality of first cylinders (201), each of which has a central circular hole at its center for the second cylinder (202) to pass through, and each central circular hole has at least one slot at its edge; the second cylinder (202) comprises a plurality of groups of spring sheets, the number of spring sheet groups being the same as the number of the first cylinders (201), and each group of spring sheets can be independently ejected or retracted; when any group of spring sheet groups is ejected, it can be engaged with the slot of one of the plurality of first cylinders (201); after engagement, the second cylinder (202) can control the rotation and up and down movement of the engaged first cylinder (201).

2. The movable electrode assembly for achieving controllable irreversible electroporation ablation volume according to claim 1, characterized in that: The strip-shaped outlet (102) is covered by a flexible material (103), and the electrode (203) can pass through the flexible material (103) to the outside of the hollow electrode needle (101).

3. The movable electrode assembly for achieving controllable irreversible electroporation ablation volume according to claim 2, characterized in that: The flexible material (103) covers the strip-shaped outlet (102) along the same direction.

4. The movable electrode assembly for achieving controllable irreversible electroporation ablation volume according to claim 1, characterized in that: The inner wall of the hollow electrode needle (101) comprises a limit baffle, and the limit baffle limits the rotation range of the first column (201).

5. The movable electrode assembly for achieving controllable irreversible electroporation ablation volume according to claim 1, characterized in that: The electrode assembly further comprises a third column (301) and a fourth column (302); the third column (301) and the fourth column (302) are hollow and concentrically sleeved on the second column (202); the diameter of the third column (301) is larger than that of the fourth column (302), and the height of the third column (301) is much smaller than that of the fourth column (302); the fourth column (302) can control the rotation of the third column (301); the fourth column (302) can control the up and down movement of the third column (301) in the hollow electrode needle (101); a plurality of electrodes (303) are connected to the surface of the third column (301), and the number of the electrodes (303) is the same as that of the strip-shaped outlet (102); the fourth column (302) drives the third column (301) to rotate; When the third column (301) rotates in a first direction, the multiple electrodes (303) extend from the strip-shaped outlet (102), wherein each electrode (303) corresponds to one strip-shaped outlet (102); when the fourth column (302) drives the third column (301) to rotate in a second direction, the multiple electrodes (303) retract from the strip-shaped outlet (102) into the interior of the hollow electrode needle (101); after the fourth column (302) can control the third column (301) to move away from one end in the hollow electrode needle (101), when the fourth column (302) drives the third column (301) to rotate in the first direction, the multiple electrodes (303) extend from the strip-shaped outlet (102), and the extending position is away from the first end.

6. The movable electrode assembly for achieving controllable irreversible electroporation ablation volume according to claim 5, characterized in that: The electrode assembly further comprises a plurality of structures having a similar shape to the third column (301) and the fourth column (302) but different sizes, which are concentrically sleeved in sequence.

7. The movable electrode assembly for achieving controllable irreversible electroporation ablation volume according to claim 6, characterized in that: A friction force is provided between the inner wall of the hollow electrode needle (101) and the first column (201), and when the first column (201) is moved, the first column (201) will not move automatically unless an external force is applied.

8. The movable electrode assembly for achieving controllable irreversible electroporation ablation volume according to claim 6, characterized in that: Each of the plurality of first columns (201) is provided with a sensor, and the sensor can collect a signal indicating whether the card slot is engaged, and send the signal indicating whether the card slot is engaged to the console.

9. The movable electrode assembly for achieving controllable irreversible electroporation ablation volume according to claim 6, characterized in that: The console can display the relative positions of the first column (201), the second column (202) and the hollow electrode needle (101).

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