An electrode device

Abstract

The application provides an electrode device, comprising a handle, a needle rod connected to a distal end of the handle, a first electrode and a second electrode arranged in sequence from a distal end of the needle rod to a proximal end of the needle rod. The handle comprises a shell and a slider; the first electrode is electrically connected with a first conductive ring located in the shell; the second electrode is electrically connected with a second conductive ring located in the shell. One side of the slider is located outside the shell, the other side is arranged in the shell and provided with a slider conductive ring; the slider conductive ring is used for electrical connection with one pole of a power supply, the first conductive ring is used for electrical connection with another pole of the power supply, and the slider is configured to be slidable to make the slider conductive ring electrically connected with or separated from the second conductive ring.

Description

Technical Field

[0001] This application relates to the field of medical devices, and more specifically, to an electrode device. Background Technology

[0002] Steep pulse ablation uses a high-voltage steep pulse electric field to create permanent nanoscale perforations in the cell membrane, thereby inducing apoptosis. This technology is a new technology in the field of tumor ablation, and in recent years it has received more and more attention and has been used in clinical tumor treatment.

[0003] Steep pulse ablation requires a high-voltage steep pulse electric field generator and electrode needles. These needles are inserted into the lesion site. In practice, two electrode needles are used simultaneously as positive and negative poles for each discharge cycle. Often, multiple electrodes, up to six, are used in a single procedure, necessitating six punctures. Furthermore, a navigation board is required during needle placement to ensure parallelism between the electrode needles. If the needles are not parallel, the electric field will concentrate at the closer end, significantly reducing the ablation area and affecting treatment effectiveness. Therefore, these electrode needles pose significant inconvenience to the surgical procedure. When percutaneous ablation is chosen, the use of multiple electrode needles also means multiple punctures, adding further harm to the patient. Utility Model Content

[0004] The purpose of this application is to provide an electrode device that can reduce the number of punctures required during steep pulse ablation therapy.

[0005] The embodiments of this application are implemented as follows:

[0006] In a first aspect, embodiments of this application provide an electrode device, including a handle, a needle bar connected to the distal end of the handle, and a first electrode and a second electrode sequentially disposed from the distal end to the proximal end of the needle bar. The handle includes a housing and a slider; the first electrode is electrically connected to a first conductive ring located within the housing; the second electrode is electrically connected to a second conductive ring located within the housing. One side of the slider is located outside the housing, and the other side is disposed within the housing and has a slider conductive ring; the slider conductive ring is used for electrical connection to one pole of a power source, the first conductive ring is used for electrical connection to the other pole of the power source, and the slider is configured to slide so that the slider conductive ring is electrically connected to or disconnected from the second conductive ring.

[0007] In the above technical solution, the handle is for the user to hold. The first electrode on the needle bar is electrically connected to one pole of the power supply via a first conductive ring, and the second electrode is electrically connected to the other pole of the power supply via a second conductive ring and a slider conductive ring. After the needle bar is inserted into the patient's body, the second electrode is electrically connected to one pole of the power supply by sliding the slider, so that the first and second electrodes are respectively connected to the two poles of the power supply, thereby achieving discharge and creating nanoscale permanent perforations in the patient's cell membrane. Sliding the slider can also separate the second electrode from the power supply electrode, thus disconnecting the power. Therefore, when using the electrodes provided in the above technical solution to treat patients, the number of punctures required can be reduced.

[0008] In some optional embodiments, the surface of the needle bar is provided with a conductive groove extending along the length of the needle bar, and the first electrode and the first conductive ring, as well as the second electrode and the second conductive ring, are connected by wires. The wires are located in the conductive grooves, and the outer peripheral surface of the wires does not protrude from the surface of the needle bar.

[0009] In the above technical solution, by placing the wire used for electrical connection inside the conductive groove, the influence of the wire on the outer diameter of the electrode device at the needle rod position can be reduced, and the influence on the position of the wire during puncture can be reduced, thus reducing the possibility of the wire falling off.

[0010] In some alternative embodiments, the wire includes an inner conductive filament and an outer insulating layer.

[0011] In some optional embodiments, a first insulating member is provided between the first electrode and the second electrode; the first electrode, the second electrode and the first insulating member are all annular structural members sleeved on the outside of the needle bar, and the outer diameters of the first electrode, the second electrode and the first insulating member are equal.

[0012] In the above technical solution, the first insulating component serves to separate the first electrode from the second electrode, preventing short circuits caused by direct contact between the two electrodes. Since the first electrode, second electrode, and first insulating component are all annular structures sleeved on the outside of the needle shaft, they can be prevented from detaching from the needle shaft during puncture. Because the outer diameters of the first electrode, second electrode, and first insulating component are equal, puncture can be performed more smoothly, reducing patient discomfort.

[0013] In some alternative implementations, a second insulating element is also provided outside the needle bar, with one end of the second insulating element contacting the second electrode and the other end contacting the housing.

[0014] In the above technical solution, by providing a second insulating member between the second electrode and the housing, and since one end of the second insulating member is in contact with the second electrode and the other end is in contact with the housing, the second insulating member can play a limiting role during the puncture process, thus preventing displacement of the first electrode and the second electrode.

[0015] In some optional embodiments, a third electrode and a fourth electrode are also included, with the first electrode, the second electrode, the third electrode, and the fourth electrode sequentially arranged from the distal end to the proximal end of the needle bar. The third electrode is electrically connected to a third conductive ring located within the housing, and the fourth electrode is electrically connected to a fourth conductive ring located within the housing; the third and fourth conductive rings are sleeved on the outside of the needle bar. The slider is configured to be slidable such that the slider conductive ring is electrically connected to any one of the second, third, and fourth conductive rings.

[0016] In the above technical solution, multiple electrodes are provided on the needle bar. By sliding the slider, the two poles of the power supply can be connected to electrodes at different positions, thereby changing the size of the ablation area.

[0017] In some optional embodiments, the first electrode, the second electrode, the third electrode, and the fourth electrode are arranged sequentially from the distal end to the proximal end of the needle bar; the length of the first electrode and the second electrode is 5mm to 10mm, the distance L1 between the first electrode and the second electrode is 5mm to 15mm, and the distance between the second electrode and the third electrode, and the distance between the third electrode and the fourth electrode, is L1 / 2.

[0018] In some alternative embodiments, the proximal end of the needle bar is located within the housing, and the first conductive ring, the second conductive ring, the third conductive ring, and the fourth conductive ring are all disposed on the needle bar; insulating elements are disposed between the first conductive ring and the second conductive ring, between the second conductive ring and the third conductive ring, and between the third conductive ring and the fourth conductive ring.

[0019] In some alternative implementations, the first electrode and the second electrode are structural components made of platinum-iridium alloy, tungsten, or gold.

[0020] In the above technical solution, the first electrode and the second electrode are structural components made of the above-mentioned material, which can make the first electrode and the second electrode have a certain imaging property, making it easy to observe their position in the patient's body.

[0021] In some alternative embodiments, the needle bar is a zirconium oxide or aluminum oxide structural component.

[0022] In the above technical solution, the needle bar is made of a relatively hard material, which facilitates puncture and provides insulation. Attached Figure Description

[0023] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 A schematic diagram of the electrode device provided in the first embodiment of this application;

[0025] Figure 2 This is a schematic diagram of the needle bar structure provided in the first embodiment of this application;

[0026] Figure 3 A schematic diagram of the longitudinal section of the needle bar provided in the first embodiment of this application;

[0027] Figure 4 A schematic diagram of the interior of the handle provided in the first embodiment of this application;

[0028] Figure 5 A schematic cross-sectional view of the needle bar provided in the first embodiment of this application;

[0029] Figure 6 A schematic diagram of the electrode device provided in the second embodiment of this application;

[0030] Figure 7 A cross-sectional view of the electrode device provided in the second embodiment of this application;

[0031] Figure 8 This is a schematic cross-sectional view of the needle bar provided in the second embodiment of this application.

[0032] Icons: 10-Needle bar; 11-Needle tip; 12-Conductive groove; 21-First electrode; 22-Second electrode; 23-Third electrode; 24-Fourth electrode; 31-First conductive ring; 35-Wire; 41-First insulating component; 42-Second insulating component; 43-Third insulating component; 44-Fourth insulating component; 51-Housing; 511-First locking position; 512-Second locking position; 513-Third locking position; 52-Slider; 521-Slider conductive ring; 6-Cable. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0034] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0035] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0036] In the description of this application, it should be noted that the terms "center," "upper," "lower," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. In addition, the terms "first," "second," and "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0037] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0038] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0039] This application provides an electrode device that allows for a single puncture during patient treatment.

[0040] like Figure 1 and Figure 6 As shown, the electrode device provided in this embodiment includes a handle and a needle bar 10, with the needle bar 10 connected to the distal end of the handle. The needle bar 10 is a structure for puncturing and entering the patient's body, while the handle is a structure for the user to hold. The distal end of the handle is connected to the needle bar 10, and the distal end of the needle bar 10 has a needle tip 11 formed by three oblique cuts. A first electrode 21 and a second electrode 22 are sequentially arranged from the distal end of the needle bar 10 to its proximal end. In the field of interventional medical devices, the end of a medical device implanted in the human or animal body that is closer to the operator is generally called the "proximal end," and the end that is farther from the operator is called the "distal end." This application defines the "proximal end" and "distal end" of any component of a medical device based on this principle.

[0041] Furthermore, such as Figure 1 and Figure 4 As shown, the handle includes a housing 51 and a slider 52. One side of the slider 52 is located outside the housing 51, and the other side is disposed inside the housing 51 and has a slider conductive ring 521. A first electrode 21 is electrically connected to a first conductive ring 31 located inside the housing 51; a second electrode 22 is electrically connected to a second conductive ring located inside the housing 51. The slider conductive ring 521 is used for electrical connection to one pole of the power supply, and the first conductive ring 31 is used for electrical connection to the other pole of the power supply. The slider 52 is configured to slide, allowing the slider conductive ring 521 to be electrically connected to or disconnected from the second conductive ring. Figure 1 In the embodiment shown, the slider conductive ring 521 is connected to a cable 6, which is connected to one pole of the power supply; the first conductive ring 31 is connected to another cable 6, which is connected to the other pole of the power supply.

[0042] When using the electrode device provided in this application, the user can hold the handle and insert the needle rod 10 into the patient's body. The user then slides the side located outside the housing 51 to change the position of the slider conductive ring 521, making the slider conductive ring 521 electrically connected to the second conductive ring. This causes the second electrode 22 to be electrically connected to one pole of the power supply, and the first electrode 21 to be electrically connected to the other pole. Discharge then occurs through the first electrode 21 and the second electrode 22, creating a perforation in the cell membrane. When discharge between the first electrode 21 and the second electrode 22 is not required, the slider 52 conductive ring can be slid to a position separated from the second conductive ring, thus disconnecting the second electrode 22 from the power supply. Since the electrode device provided in this application has a first electrode 21 and a second electrode 22 on the needle rod 10, and the first electrode 21 and the second electrode 22 are respectively used to connect to different poles of the power supply, after the needle rod 10 is punctured into the patient's body, the first electrode 21 connected to one pole of the power supply and the second electrode 22 connected to the other pole of the power supply enter the patient's body at the same time. Therefore, treatment can be started on the patient with only one puncture, reducing the number of punctures and reducing the patient's pain.

[0043] Furthermore, in order to facilitate observation of the position of the first electrode 21 and the second electrode 22 in the patient's body, the first electrode 21 and the second electrode 22 can be made of platinum-iridium alloy, tungsten, or gold materials; the materials of the first electrode 21 and the second electrode 22 can be the same or different.

[0044] Furthermore, the needle rod 10 is a zirconium oxide or aluminum oxide structural component to provide good insulation, preventing direct electrical connection between the first electrode 21 and the second electrode 22 via the needle rod 10; it also provides good rigidity, allowing for smooth insertion into the patient's body. In other embodiments, the needle rod 10 can be made of other insulating materials with good rigidity. In other embodiments, the needle rod 10 can also be a metal rod with an insulating coating on its surface.

[0045] In some implementations, such as Figure 2 , Figure 5 and Figure 8As shown, the surface of the needle bar 10 is provided with a conductive groove 12 extending along the length direction of the needle bar 10. The first electrode 21 and the first conductive ring 31, as well as the second electrode 22 and the second conductive ring, are connected by wires 35. The wires 35 are located within the conductive groove 12, and their outer circumferential surfaces do not protrude from the surface of the needle bar 10. In this embodiment, by providing a conductive groove 12 extending along the length direction of the needle bar 10 on its surface, the wires 35, after being installed in the conductive groove 12, can extend from the location of the first electrode 21 to the location of the first conductive ring 31, thereby connecting the two, or extend from the location of the second electrode 22 to the location of the second conductive ring, thereby connecting the two. Both the first conductive ring 31 and the second conductive ring are conductors and are metal structural components. The first conductive ring 31 and the second conductive ring can also be made of the same material as the first electrode 21 or the second electrode 22, or they can be made of stainless steel or other metal materials. Since the outer peripheral surface of the wire 35 does not protrude from the surface of the needle bar 10, on the one hand, the influence of the wire 35 on the radial dimension of the electrode device provided in this application at the needle bar 10 position can be reduced; on the other hand, the influence on the position of the wire 35 during puncture can be reduced, and the possibility of the wire 35 falling off can be reduced. In other embodiments, the conductive groove 12 may not be provided on the surface of the needle bar 10, but a hole structure extending along its length direction may be provided in the needle bar 10 for the wire 35 to pass through.

[0046] Furthermore, the conductor 35 includes an inner conductive wire and an outer insulating layer. The conductive wire is a metal structural component that can conduct electricity, and the insulating layer is an insulating structural component used to cover the conductive wire on the inside to prevent leakage.

[0047] In some implementations, such as Figure 1 and Figure 3 As shown, a first insulating member 41 is provided between the first electrode 21 and the second electrode 22. The first electrode 21, the second electrode 22, and the first insulating member 41 are all annular structures and are sleeved on the outside of the needle rod 10. Therefore, the first electrode 21, the second electrode 22, and the first insulating member 41 will not detach from the needle rod 10 during puncture. The first insulating member 41 serves to separate the first electrode 21 and the second electrode 22, preventing short circuits caused by direct contact between them. Furthermore, the outer diameters of the first electrode 21, the second electrode 22, and the first insulating member 41 are equal, allowing for smoother puncture and reducing patient discomfort. The first insulating member 41 is made of a polymer material with good insulation properties, such as PEEK, PEBAX, PI, or other materials with excellent insulation properties.

[0048] In other embodiments, the first electrode 21 and the second electrode 22 can be separated by providing a flange on the needle bar 10. Specifically, the first electrode 21 is located on one side of the flange and the second electrode 22 is located on the other side of the flange, so as to avoid the first electrode 21 and the second electrode 22 coming into contact and causing a short circuit.

[0049] In some embodiments, a second insulating member 42 is provided outside the needle bar 10, with one end of the second insulating member 42 contacting the second electrode 22 and the other end contacting the housing 51. During the puncture process, the first electrode 21, the second electrode 22, and the first insulating member 41 are subjected to a force in the direction of the housing 51. Therefore, by providing the second insulating member 42 between the second electrode 22 and the housing 51, on the one hand, displacement of the first electrode 21, the second electrode 22, and the first insulating member 41 during the puncture process can be limited, making the positions of the first electrode 21 and the second electrode 22 more accurate; on the other hand, the second insulating member 42 can play an insulating role.

[0050] In other embodiments, the second insulating member 42 can also be limited by providing a flange or shoulder on the needle bar 10. After the second insulating member 42 is installed in place, one end of the second insulating member 42 abuts against the flange or shoulder. During the puncture process, the displacement of the first electrode 21, the second electrode 22 and the first insulating member 41 is limited by the shoulder or flange structure on the needle bar 10.

[0051] In some implementations, such as Figure 6 and Figure 7 As shown, a third electrode 23 and a fourth electrode 24 are also provided on the needle bar 10. From the distal end to the proximal end of the needle bar 10, the first electrode 21, the second electrode 22, the third electrode 23, and the fourth electrode 24 are arranged sequentially. The third electrode 23 is electrically connected to a third conductive ring located within the housing 51, and the fourth electrode 24 is electrically connected to a fourth conductive ring located within the housing 51; the third and fourth conductive rings are sleeved on the outside of the needle bar 10. The slider 52 is configured to slide so that the slider conductive ring 521 is electrically connected to any one of the second, third, and fourth conductive rings. In this embodiment, the user can connect any one of the second, third, and fourth conductive rings to one pole of the power supply by sliding the slider 52 and the conductive ring 521, thereby connecting any one of the second electrode 22, third electrode 23, and fourth electrode 24 to one pole of the power supply, while the first electrode 21 is electrically connected to the other pole of the power supply; discharge can be achieved between the first electrode 21 and the second electrode 22, or between the first electrode 21 and the third electrode 23, or between the first electrode 21 and the fourth electrode 24.

[0052] In the embodiment described above, where the needle bar 10 is further equipped with a third electrode 23 and a fourth electrode 24, the size of the ablation zone can be changed by altering the electrodes (including the first electrode 21, the second electrode 22, the third electrode 23, and the fourth electrode 24) connected to the two poles of the power supply, thereby allowing for the treatment of cells in different regions of the patient's body. The ablation zone is the area that the electrode device can process; cells within this zone will experience cell membrane perforation under the action of the electrode device. Therefore, in this embodiment, changing the ablation zone can be achieved simply by sliding the slider 52 to change the electrodes connected to the two poles of the power supply, without needing to replace the needle bar with one of other specifications for insertion into the patient's body.

[0053] Furthermore, such as Figure 8 As shown, four conductive grooves 12 are provided on the needle bar 10. Each conductive groove 12 contains a wire 35. One wire 35 is used to electrically connect the first electrode 21 and the first conductive ring 31, one wire 35 is used to electrically connect the second electrode 22 and the second conductive ring, one wire 35 is used to electrically connect the third electrode 23 and the third conductive ring, and one wire 35 is used to electrically connect the fourth electrode 24 and the fourth conductive ring.

[0054] In some embodiments, a locking structure is also provided between the slider 52 and the housing 51. This locking structure restricts the relative movement between the slider 52 and the housing 51 when the slider conductive ring 521 contacts the second, third, or fourth conductive ring. Furthermore, the slider 52 can still slide relative to the housing 51 after the user applies force. Figure 7 As shown, the housing 51 is provided with a first locking position 511, a second locking position 512 and a third locking position 513. When the slider 52 slides to the first locking position 511, the slider conductive ring 521 contacts the second conductive ring; when the slider 52 slides to the second locking position 512, the slider conductive ring 521 contacts the third conductive ring; and when the slider 52 slides to the third locking position 513, the slider conductive ring 521 contacts the fourth conductive ring.

[0055] Furthermore, in an embodiment where a third electrode 23 and a fourth electrode 24 are also provided on the needle bar 10, a second insulating member 42 is located between the second electrode 22 and the third electrode 23; a third insulating member 43 is also provided between the third electrode 23 and the fourth electrode 24; and a fourth insulating member 44 is also provided between the fourth electrode 24 and the housing 51.

[0056] Furthermore, the first electrode 21, the second electrode 22, the third electrode 23, and the fourth electrode 24 are arranged sequentially from the distal end to the proximal end of the needle bar 10. The lengths of the first electrode 21 and the second electrode 22 are between 5 mm and 10 mm, the distance L1 between the first electrode 21 and the second electrode 22 is between 5 mm and 15 mm, and the distance between the second electrode 22 and the third electrode 23, and the distance between the third electrode 23 and the fourth electrode 24, are L1 / 2.

[0057] In some embodiments, the first conductive ring 31, the second conductive ring, the third conductive ring, and the fourth conductive ring are all disposed on the needle bar 10. Specifically, this can be achieved by sleeves on the needle bar 10 or by embedding them in the needle bar 10. Furthermore, conductive ring insulating elements are provided between the first conductive ring 31 and the second conductive ring, between the second conductive ring and the third conductive ring, and between the third conductive ring and the fourth conductive ring. By providing conductive ring insulating elements, insulation can be achieved.

[0058] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. An electrode device, characterized in that, Includes a handle, the distal end of which is connected to a needle bar, and a first electrode and a second electrode are sequentially arranged from the distal end of the needle bar to the proximal end of the needle bar; The handle includes a housing and a slider; the first electrode is electrically connected to a first conductive ring located inside the housing; the second electrode is electrically connected to a second conductive ring located inside the housing; The slider has one side located outside the housing and the other side located inside the housing and is provided with a slider conductive ring; the slider conductive ring is used to be electrically connected to one pole of the power supply, the first conductive ring is used to be electrically connected to the other pole of the power supply, and the slider is configured to be slidable so that the slider conductive ring is electrically connected to or separated from the second conductive ring.

2. The electrode device according to claim 1, characterized in that, The surface of the needle bar is provided with a conductive groove extending along the length of the needle bar. The first electrode and the first conductive ring, as well as the second electrode and the second conductive ring, are connected by wires. The wires are located in the conductive grooves, and the outer circumferential surface of the wires does not protrude from the surface of the needle bar.

3. The electrode device according to claim 2, characterized in that, The wire includes an inner conductive filament and an outer insulating layer.

4. The electrode device according to claim 2, characterized in that, A first insulating element is provided between the first electrode and the second electrode; the first electrode, the second electrode and the first insulating element are all annular structural components sleeved on the outside of the needle bar, and the outer diameters of the first electrode, the second electrode and the first insulating element are equal.

5. The electrode device according to claim 4, characterized in that, A second insulating component is also provided outside the needle bar, with one end of the second insulating component in contact with the second electrode and the other end in contact with the housing.

6. The electrode device according to claim 1, characterized in that, It also includes a third electrode and a fourth electrode, and the first electrode, the second electrode, the third electrode and the fourth electrode are arranged sequentially from the distal end to the proximal end of the needle bar; The third electrode is electrically connected to a third conductive ring located inside the housing, and the fourth electrode is electrically connected to a fourth conductive ring located inside the housing; the third conductive ring and the fourth conductive ring are sleeved on the outside of the needle bar; The slider is configured to slide so that the slider conductive ring is electrically connected to any one of the second conductive ring, the third conductive ring, and the fourth conductive ring.

7. The electrode device according to claim 6, characterized in that, The first electrode, the second electrode, the third electrode, and the fourth electrode are arranged sequentially from the distal end to the proximal end of the needle bar; the length of the first electrode and the second electrode is 5mm to 10mm, the distance L1 between the first electrode and the second electrode is 5mm to 15mm, and the distance between the second electrode and the third electrode, and the distance between the third electrode and the fourth electrode, is L1 / 2.

8. The electrode device according to claim 6, characterized in that, The proximal end of the needle bar is located inside the housing, and the first conductive ring, the second conductive ring, the third conductive ring, and the fourth conductive ring are all disposed on the needle bar; insulating elements are disposed between the first conductive ring and the second conductive ring, between the second conductive ring and the third conductive ring, and between the third conductive ring and the fourth conductive ring.

9. The electrode device according to claim 1, characterized in that, The first electrode and the second electrode are structural components made of platinum-iridium alloy, tungsten, or gold.

10. The electrode device according to claim 1, characterized in that, The needle bar is a zirconia or alumina structural component.

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