Tumor electric field treatment device and electrode plate

Abstract

The utility model provides a tumor electric field treatment device and an electrode slice, the tumor electric field treatment device comprises an electrode array, the electrode array comprises a plurality of electrode units and a plurality of connecting parts for connecting two adjacent electrode units, and the electrode units comprise a plurality of first electrode units with temperature sensors and a plurality of second electrode units without temperature sensors; the connecting parts comprise a plurality of first connecting parts arranged in the row direction and a plurality of second connecting parts arranged in the column direction; the plurality of first electrode units, the plurality of second electrode units, the plurality of first connecting parts and the plurality of second connecting parts jointly form two trunks which face the center of the electrode array, are arranged in a concave shape and are symmetrical to each other, a plurality of branches extending in the row direction are arranged on the two sides of each trunk respectively, and a wiring part is erected between every two adjacent second connecting parts. The tumor electric field treatment device and the electrode plate can comprehensively measure the temperature and reduce the wiring difficulty.

Description

Technical Field

[0001] This application relates to the field of medical device technology, and in particular to a tumor electric field therapy device and electrode pads. Background Technology

[0002] Tumor electric field therapy (TEF) is a tumor treatment method that uses a specialized electric field generator to generate a low-intensity, medium-to-high-frequency, alternating electric field to interfere with the mitotic process of tumor cells. Studies have shown that TGF therapy is highly effective in treating glioblastoma, non-small cell lung cancer, and malignant pleural mesothelioma. The applied electric field can affect the aggregation of microtubules, prevent spindle formation, inhibit mitosis, and induce apoptosis in cancer cells. The TGF device mainly consists of an electric field generator, an adapter, and multiple pairs of electrodes. The electric field generator produces an alternating electrical signal, which is transmitted to the electrode pads via the adapter. The electrode pads are applied in pairs to the skin on opposite sides of the tumor region, and an alternating current signal is applied between each pair of electrodes to non-invasively apply a therapeutic electric field to the tumor region.

[0003] Existing Chinese invention patent announcement No. 114099954 discloses an electrode sheet with twenty electrode units. However, only eight electrode units have temperature sensors, making it difficult to comprehensively monitor the temperature of the entire electrode sheet. This results in some electrode units exceeding the human body's safe temperature threshold, causing low-temperature burns to the patient's skin. Increasing the number of temperature sensors can solve this problem, but it places higher demands on the wiring design of the electrode sheet. Too many conductive traces lead to complex wiring and increased weight of the electrode array, affecting the comfort during application.

[0004] Therefore, it is indeed necessary to provide an improved tumor electric field therapy device and electrode pads to overcome the problems existing in the prior art. Utility Model Content

[0005] This application provides a tumor electric field therapy device and electrode pads that can comprehensively measure temperature and have reasonable wiring.

[0006] Specifically, this application is achieved through the following technical solution: an electrode sheet, comprising an electrode array, the electrode array comprising a plurality of electrode units and a plurality of connecting portions connecting adjacent electrode units, the electrode unit comprising a plurality of first electrode units equipped with temperature sensors and a plurality of second electrode units without temperature sensors; the connecting portions comprising a plurality of first connecting portions arranged along the row direction and a plurality of second connecting portions arranged along the column direction; the plurality of first electrode units, the plurality of second electrode units, the plurality of first connecting portions and the plurality of second connecting portions together constitute two main trunks arranged in a concave shape towards the center of the electrode array and symmetrical to each other, the main trunks having a plurality of branches extending along the row direction on both sides, and a wiring portion being provided between adjacent second connecting portions.

[0007] According to one embodiment of the present invention, each branch is provided with only one first electrode unit, and the first electrode unit located on each branch is connected to the corresponding main trunk only through a first connecting part.

[0008] According to one embodiment of the present invention, the first electrode unit located on each of the branches is connected to the first electrode unit or the second electrode unit located on the corresponding main trunk only through a first connecting portion.

[0009] According to one embodiment of the present invention, each of the main trunks is provided with four branches.

[0010] According to one embodiment of the present invention, two branches on each of the main trunks extend toward the inner side of the electrode array, and the remaining two branches extend toward the outer side of the electrode array.

[0011] According to one embodiment of the present invention, there are twenty electrode units, including sixteen first electrode units and four second electrode units. The twenty electrode units are arranged in four rows and six columns. Each of the first and fourth rows has four electrode units located in the second to fifth columns respectively. Each of the second and third rows has six electrode units located in the first to sixth columns respectively. Each electrode unit located in the second and third rows and in the second and fifth columns is a second electrode unit, and the remaining electrode units are first electrode units.

[0012] According to one embodiment of the present invention, the first electrode unit located in the first row and second column, the second electrode unit located in the second row and second column, the first electrode unit located in the second row and third column, the first electrode unit located in the third row and third column, the second electrode unit located in the third row and second column, the first electrode unit located in the fourth row and second column, and the second connecting portion and the first connecting portion located between the above electrode units together constitute one main trunk; the first electrode unit located in the first row and fifth column, the second electrode unit located in the second row and fifth column, the first electrode unit located in the second row and fourth column, the first electrode unit located in the third row and fourth column, the second electrode unit located in the third row and fifth column, the first electrode unit located in the fourth row and fifth column, and the second connecting portion and the first connecting portion located between the above electrode units together constitute another main trunk.

[0013] According to one embodiment of the present invention, the branches on each of the main trunks are respectively located in the first row, the second row, the third row and the fourth row; two branches located in the first row and the fourth row extend toward the inner side of the electrode array, and two branches located in the second row and the third row extend toward the outer side of the electrode array.

[0014] According to one embodiment of the present invention, the electrode array is provided with a plurality of ground traces, a plurality of signal traces and an AC trace. The first electrode units are arranged in multiple rows and columns in the circuit connection. The ground terminals of the temperature sensors of each first electrode unit located in the same row are all connected to the same ground trace. The signal terminals of the temperature sensors of each first electrode unit located in the same column are all connected to the same signal trace. The plurality of electrode units are all connected to the same AC trace.

[0015] This application also provides the following technical solution: a tumor electric field therapy device, which includes an electric field generator and a plurality of the aforementioned electrode plates, wherein the electric field generator and each of the aforementioned electrode plates are electrically connected.

[0016] The tumor electric field therapy device and its electrode pads of this application have most of the electrode units with good degrees of freedom, which can improve the adhesion of the electrode pads and make it less likely to wrinkle when applied to curved body surfaces; the reasonable setting of the number and position of temperature sensors can realize comprehensive temperature measurement and avoid causing low-temperature burns to the patient's body surface. At the same time, the use of a reasonable wiring scheme can reduce the wiring difficulty and weight of the electrode array.

[0017] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit this application. Attached Figure Description

[0018] Figure 1This is a frame diagram of a tumor electric field therapy device according to one embodiment of this application;

[0019] Figure 2 This is a plan view of the electrode sheet according to the first embodiment of the tumor electric field therapy device of this application;

[0020] Figure 3 for Figure 2 The diagram shown is a plan view of the electrode sheet after the adhesive has been removed.

[0021] Figure 4 for Figure 2 Partial exploded three-dimensional view of the electrode sheet shown;

[0022] Figure 5 for Figure 4 A plan view of the electrode array of the electrode sheet shown;

[0023] Figure 6 for Figure 5 An exploded three-dimensional view of the electrode array shown.

[0024] Figure 7 for Figure 6 Wiring diagram of AC traces on the front side of the flexible circuit board of the electrode array shown.

[0025] Figure 8 for Figure 6 Wiring diagram of the grounding trace on the back of the flexible circuit board shown;

[0026] Figure 9 for Figure 6 The wiring diagram of the signal traces on the back of the flexible circuit board is shown.

[0027] Figure 10 This is a schematic diagram of the circuit connection between an electrode plate and an adapter in a tumor electric field therapy device.

[0028] Explanation of reference numerals in the attached figures:

[0029] Tumor electric field therapy device 100, electric field generator 10, adapter 20, controller 21, analog-to-digital conversion module 22, communication unit 23, voltage divider resistor 24, grounding switch 25, first grounding switch 25-1, second grounding switch 25-2, third grounding switch 25-3, fourth grounding switch 25-4, power module 26, AC line 27, electrode sheet 30, electrode array 31, main trunk L1, L2, branch L3, electrode unit 310, first electrode unit 310A, second electrode unit 310B, connecting part 311, second connecting part 3112, first connecting part 3111, wiring part 312, gold finger 3121, flexible circuit board 313, AC trace 3131, etc. Ground trace 3132, first ground trace 3132-1, second ground trace 3132-2, third ground trace 3132-3, fourth ground trace 3132-4, signal trace 3133, first signal trace 3133-1, second signal trace 3133-2, third signal trace 3133-3, fourth signal trace 3133-4, main body 314, conductive pad 3141, grounding pad 3142, signal pad 3143, dielectric element 315, through hole 3151, insulating plate 316, temperature sensor 317, grounding terminal 3171, signal terminal 3172, diode 318, backing 32, support 33, through hole 331, adhesive 34, connector 40. Detailed Implementation

[0030] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses, systems, devices, and methods consistent with some aspects of this application.

[0031] refer to Figure 1 As shown, the tumor electric field therapy device 100 includes an electric field generator 10, an adapter 20, and several pairs of electrode pads 30. The adapter 20 electrically connects the electric field generator 10 to each electrode pad 30. The electric field generator 10 generates an alternating current signal required for treatment. The adapter 20 receives the alternating current signal output from the electric field generator 10 and transmits it to the electrode pads 30. The pairs of electrode pads 30 are applied to the patient's body surface corresponding to the tumor area, applying the alternating current signal to the patient's tumor area to interfere with or prevent the mitosis of the patient's tumor cells, thereby achieving the purpose of treating the tumor.

[0032] refer to Figures 2 to 4As shown, the electrode sheet 30 includes an electrode array 31, a backing 32, several support members 33, and several adhesive members 34. The electrode array 31 is adhered to the backing 32 and electrically connected to the adapter 20 via wires (not shown). The electrode array 31 has twenty electrode units 310 arranged in four rows and six columns. Each support member 33 corresponds to two or three electrode units 310 in the same row. The support member 33 has several through holes 331 and is adhered to the backing 32 such that each through hole 331 surrounds its corresponding electrode unit 310. The inner diameter of the through holes 331 is slightly larger than the outer diameter of the electrode unit 310 to facilitate installation. The support member 33 supports and protects the electrode units 310. Similarly, each adhesive member 34 corresponds to two or three electrode units 310 in the same row, covering each row of electrode units 310 and the corresponding support member 33. In other embodiments, the adhesive members 34 can also be laid separately for each electrode unit 310. Electrode pads 30 are applied to the patient's skin with the exposed side of the adhesive patch 34 facing the patient. Here, the side of the electrode pad 30 facing the patient is defined as the front, and the opposite side as the back. The backing 32 is a mesh non-woven fabric with a biocompatible adhesive (not shown) coated on the front side to ensure a tight fit to the patient's skin. The support 33 is made of foam material. The adhesive patch 34 is double-sided adhesive, preferably a conductive gel, to keep the skin surface moist and prevent itching.

[0033] refer to Figure 5 As shown, the twenty electrode units 310 of the electrode array 31 are arranged both axially symmetrically and centrally symmetrically. These twenty electrode units 310 are arranged in four rows and six columns. Specifically, the first and fourth rows each have four electrode units 310, and the two middle rows (i.e., the second and third rows) each have six electrode units 310. The six electrode units 310 in each of the two middle rows are arranged in six columns, located in columns one through six respectively; the four electrode units 310 in each of the first and fourth rows are arranged in four columns, located in columns two through five respectively.

[0034] The electrode array 31 also includes a plurality of connecting portions 311 and a wiring portion 312 connecting two adjacent electrode units 310. The wiring portion 312 is positioned between two adjacent parallel connecting portions 311 in a "T" shape and is used to connect external wires (not shown) for electrical connection with the adapter 20. The connecting portions 311 connect the electrode array 31 into a whole and also serve as wiring to ensure that each electrode unit 310 can receive AC signals. The plurality of connecting portions 311 include a first connecting portion 3111 connecting two adjacent electrode units 310 in the same row and a second connecting portion 3112 connecting two adjacent electrode units 310 in the same column. The wiring portion 312 connects two parallel second connecting portions 3112 located in the third and fourth columns (i.e., the middle two columns) and between the second and third rows. The two adjacent electrode units 310 in the third and fourth columns of each row are disconnected and do not have a first connecting part 3111. However, the two adjacent electrode units 310 in other adjacent columns of each row are provided with a first connecting part 3111. That is, the electrode array 31 is divided into left and right parts, which are connected only by the wiring part 312. Therefore, the positions of the left and right parts are relatively independent, and the application position is more flexible.

[0035] Two second connecting portions 3112 are provided between each two adjacent rows, with one portion in each of the left and right parts of the electrode array 31. Specifically, in the left half of the electrode array 31, a second connecting portion 3112 is provided between two adjacent electrode units 310 located in the first and second rows and in the second column; a second connecting portion 3112 is provided between two adjacent electrode units 310 located in the second and third rows and in the third column; and a second connecting portion 3112 is provided between two adjacent electrode units 310 located in the third and fourth rows and in the second column. In the right half of the electrode array, a second connecting portion 3112 is provided between two adjacent electrode units 310 located in the first and second rows and in the fifth column; a second connecting portion 3112 is provided between two adjacent electrode units 310 located in the second and third rows and in the fourth column; and a second connecting portion 3112 is provided between two adjacent electrode units 310 located in the third and fourth rows and in the fifth column. Apart from the twelve electrode units 310 mentioned above, all other adjacent electrode units 310 along the column are disconnected, without a second connecting part 3112, thus having a high degree of freedom.

[0036] This can be understood as follows: the twelve electrode units 310 connected by the second connecting part 3112 and their corresponding connecting parts 311 form two main trunks L1 and L2, and the two main trunks L1 and L2 are arranged in a concave shape towards the inner center of the electrode array 31 and are symmetrical to each other. Figure 5As shown by the dashed line. Other electrode units 310 and their corresponding first connecting portions 3111 form eight branches L3, each branch L3 being formed by the lateral extension of the main trunks L1 and L2. Specifically, the branches L3 can be formed by the lateral outward extension of the main trunks L1 and L2. For example, a branch L3 can be formed by two electrode units 310 located in the first column of the second row and the second column of the second row, and their corresponding first connecting portions 3111; another branch L3 can be formed by two electrode units 310 located in the first column of the third row and the second column of the third row, and their corresponding first connecting portions 3111; yet another branch L3 can be formed by two electrode units 310 located in the fifth column of the second row and the sixth column of the second row, and their corresponding first connecting portions 3111; and yet another branch L3 can be formed by two electrode units 310 located in the fifth column of the third row and the sixth column of the third row, and their corresponding first connecting portions 3111. In this case, each electrode unit 310 located on the outer side of the second and third rows is located at the end of its corresponding branch L3.

[0037] Branch L3 can also be formed by extending laterally inward from the main branches L1 and L2. For example, a branch L3 can be formed by two electrode units 310 located in the second column of the first row and the third column of the first row, and their corresponding first connection parts 3111. Another branch L3 can be formed by two electrode units 310 located in the second column of the fourth row and the third column of the fourth row, and their corresponding first connection parts 3111. Yet another branch L3 can be formed by two electrode units 310 located in the fourth column of the first row and the fifth column of the first row, and their corresponding first connection parts 3111. In this case, each electrode unit 310 located on the inner side of the first and fourth rows is located at the end of the corresponding branch L3.

[0038] Here, the direction away from the vertical axis of symmetry of the electrode array 31 is defined as the outer side, and the direction closer to the vertical axis of symmetry of the electrode array 31 is defined as the inner side. The eight electrode units 310 located at the ends of each branch L3 are connected only to their adjacent electrode unit 310 in the same row via a connecting part 311; the four electrode units 310 located on the main branches L1 and L2, specifically in the second row, second column, second row, second column, fifth column, and fifth column of the third row, are connected to their respective three adjacent electrode units 310 via corresponding connecting parts 311; the other eight electrode units 310 located on the main branches L1 and L2 are connected to their two adjacent electrode units 310. Specifically, the electrode units 310 located at the ends of each branch L3 are connected to their adjacent electrode unit 310 only via a first connecting part 3111. Therefore, the eight electrode units 310 located at the ends of each branch L3 of the electrode array 31 have a high degree of freedom and a large range of motion, allowing for better application to the patient's body surface and avoiding wrinkles. In addition, the eight electrode units 310 located on the main trunks L1 and L2 and connected only to two adjacent electrode units 310 through the connecting part 311 also have a certain degree of freedom and a certain range of motion, which can also improve the adhesion of the electrode sheet 30.

[0039] refer to Figure 6 As shown, this illustrates the hierarchical structure of the electrode array 31. The electrode array 31 includes a flexible circuit board 313. The flexible circuit board 313 includes several main body portions 314 corresponding to each electrode unit 310, several connecting portions 311, and several wiring portions 312. The connecting portions 311 connect two adjacent main body portions 314. The electrode array 31 also includes several dielectric elements 315, several insulating plates 316, several temperature sensors 317, and several diodes 318 (see figure). Figure 10 The main body 314 has a conductive disk 3141 on its front side (see reference). Figure 8Dielectric elements 315 are disposed on the front side of the main body 314 in a one-to-one correspondence and are soldered to the conductive pad 3141. A through hole 3151 is provided at the center of each dielectric element 315. Temperature sensors 317 are located on the front side of the main body 314 and are selectively disposed within some of the through holes 3151 of the dielectric elements 315. Insulating plates 316 are disposed on the back side of the main body 314 in a one-to-one correspondence. The main body 314, dielectric elements 315, and insulating plates 316 are arranged in a centrally overlapping manner to form an electrode unit 310. In this embodiment, there are sixteen temperature sensors 317. Except for the four electrode units 310 located in the second row, second column, third row, second column, second row, and third row, fifth column, the other sixteen electrode units 310 are each provided with a temperature sensor 317 mounted on the main body 314 and housed within the opening 3151 of the dielectric element 315. The diode 318 is connected in series with the corresponding temperature sensor 317. The electrode unit 310 equipped with a temperature sensor 317 and a diode 318 is the first electrode unit 310A, and the electrode unit 310 without a temperature sensor 317 and a diode 318 is the second electrode unit 310B. In other embodiments, the temperature sensor 317 may have different numbers and different arrangements, which are not limited here.

[0040] In this embodiment, the dielectric element 315 is a ceramic sheet, but it can also be in other forms, such as a polymer dielectric layer with high dielectric constant and low dielectric loss made of a thin film material with non-fixed crystal orientation, high flexibility and high toughness. This polymer dielectric layer can be formed on the main body 314 by vapor deposition, sputtering or ion plating vapor deposition, printing, spraying or casting. In addition, the insulating plate 316 is not necessary and can be selectively provided according to requirements.

[0041] The tumor electric field therapy device 100 and its electrode pads 30 provided in this application can ensure comprehensive temperature monitoring of the electrode pads 30 while allowing most of the electrode units 310 to have good degrees of freedom, improving the adhesion of the electrode pads 30 and reducing the likelihood of wrinkles when applied to curved surfaces. Furthermore, when the tumor electric field therapy device 100 is used, the electrode pads 30 can better apply the received alternating current signal to the tumor area corresponding to the curved surface, avoiding a sharp increase in heat generation and a decrease in alternating electric field strength at the corresponding location due to poor electrode pad adhesion, thus preventing any impact on the treatment effect.

[0042] refer to Figures 7 to 9As shown, the flexible circuit board 313 of the electrode sheet 30 is provided with several conductive traces on its front and back sides. The conductive trace on the front side is mainly an AC trace 3131. Among the several gold fingers 3121 of the connection part 312, there is a gold finger 3121 for transmitting AC signals. The AC trace 3131 extends from the gold finger 3121 along each connection part 311 to each main body part 314 and is electrically connected to the conductive pad 3141 located on each main body part 314 to transmit AC signals to each electrode unit 310. Each connection part 311 is provided with two parallel AC traces 3131 to ensure the stability of AC signal transmission.

[0043] The main body 314 has a grounding pad 3142 and a signal pad 3143 at the center of the conductive pad 3141, corresponding to the temperature sensor 317. (Combined) Figure 10 As shown, the temperature sensor 317 has a ground terminal 3171 and a signal terminal 3172. The ground terminal 3171 is soldered to the ground pad 3142, and the signal terminal 3172 is soldered to the signal pad 3143. The ground terminal 3171 of each temperature sensor 317 is the ground terminal of the corresponding first electrode unit 310A, and the signal terminal 3172 of each temperature sensor 317 is the signal terminal of the corresponding first electrode unit 310A. A diode 318 is connected in series with the ground terminal 3171 of the temperature sensor 317. Specifically, the anode of the diode 318 is electrically connected to the ground terminal 3171 of the corresponding temperature sensor 317, and the cathode of the diode is electrically connected to the corresponding ground trace 3132. The main body 314 also has an anode pad (unlabeled) and a cathode pad (unlabeled) corresponding to the diode 318 at the center of the conductive pad 3141. The anode pad (unlabeled) is electrically connected to the ground pad 3142 via a corresponding pad trace (unlabeled). A diode 318 is provided to prevent reverse current flow, thus preventing detection signals from other electrode units 310 from affecting the temperature sensor 317. The conductive traces on the back of the flexible circuit board 313 also include several ground traces 3132 and several signal traces 3133. Each grounding trace 3132 extends from a corresponding gold finger 3121 along the corresponding connection portion 311 to a grounding pad 3142 provided on the corresponding multiple main body portions 314, so as to electrically connect with the grounding terminal 3171 of the corresponding temperature sensor 317, for grounding the grounding terminal 3171 of the corresponding temperature sensor 317; each signal trace 3133 extends from a corresponding gold finger 3121 along the corresponding connection portion 311 to a signal pad 3143 provided on the corresponding main body portion 314, so as to electrically connect with the signal terminal 3172 of the corresponding temperature sensor 317, for transmitting DC signals to the corresponding temperature sensor 317, so as to detect the temperature at the corresponding electrode unit 310, and transmit the detected temperature signal to the adapter 20 or the electric field generator 10.

[0044] In this embodiment, to acquire the temperature detection signal from the temperature sensor 317, the flexible circuit board 313 is provided with four ground traces 3132 and four signal traces 3133. Multiple temperature sensors 317 of the first electrode units 310A can share the corresponding ground traces 3132 and signal traces 3133. The temperature detection signals of each temperature sensor 317 are acquired in batches by alternately grounding the four ground traces 3132. The control method will be described in detail later. Compared to setting an independent signal trace for each temperature sensor 317, this wiring method reduces the total number of conductive traces, lowers the wiring difficulty of the flexible circuit board 313, simplifies the manufacturing process of the flexible circuit board 313, and also improves the flexibility of the flexible circuit board 313, enhancing the adhesion during application.

[0045] In this embodiment, the wiring section 312 is provided with ten gold fingers 3121, of which four gold fingers 3121 are connected to the four grounding traces 3132 one by one; four gold fingers 3231 are connected to the four signal traces 3133 one by one; one gold finger 3121 is connected to the AC trace 3131; and one gold finger 3121 is connected to the shielding layer (not shown) of the conductor (not shown) and grounded for electromagnetic shielding and to prevent signal interference.

[0046] Continue to refer to Figures 7 to 10As shown, the wiring scheme of grounding trace 3132 and signal trace 3133 will be explained in detail below. In terms of spatial structure, these twenty electrode units 310 are labeled as electrode units M1 to M20 according to their positions from top to bottom and from left to right. Specifically, the four electrode units 310 in the first row are electrode units M1, M2, M3, and M4; the six electrode units 310 in the second row are electrode units M5, M6, M7, M8, M9, and M10; the six electrode units 310 in the third row are electrode units M11, M12, M13, M14, M15, and M16; and the four electrode units 310 in the fourth row are electrode units M17, M18, M19, and M20. The four grounding traces 3132 are designated as the first grounding trace 3132-1, the second grounding trace 3132-2, the third grounding trace 3132-3, and the fourth grounding trace 3132-4; ​​the four signal traces 3133 are designated as the first signal trace 3133-1, the second signal trace 3133-2, the third signal trace 3133-3, and the fourth signal trace 3133-4. The electrode units M6 (second row, second column), M9 (second row, fifth column), M12 (third row, second column), and M15 (third row, fifth column) are all second electrode units 310B. Therefore, these four electrode units M6, M9, M12, and M15 do not have corresponding temperature sensors 317 and diodes 318 installed, and thus do not need to be connected to the corresponding grounding traces 3132 and signal traces 3133.

[0047] Key reference Figure 8 As shown, this is a wiring diagram of the ground traces 3132 on the back of the flexible circuit board 313. The wiring scheme of the four ground traces 3132 is described in detail below from the front view of the flexible circuit board 313:

[0048] The grounding terminals 3171 of the temperature sensors 317 of electrode units M19, M20, M16, and M14 are all short-circuited to the first grounding trace 3132-1. The specific routing of the first grounding trace 3132-1 is as follows: via the end of the connector 312 upwards and to the right (…). Figure 8 The electrode extends downwards from the center (to the left) and passes through electrode units M14, M15, M20, M19 and their corresponding connecting parts 311. It then connects to the grounding pad 3142 corresponding to the grounding terminal 3171 of the temperature sensor 317 of each electrode unit M14 and M19. The electrode unit M19 then returns and passes through electrode unit M20, connecting to the grounding pad 3142 corresponding to the grounding terminal 3171 of the temperature sensor 317 of electrode unit M20. The electrode unit M16 then passes through electrode unit M15 and its corresponding connecting parts 311 and connects to the grounding pad 3142 corresponding to the grounding terminal 3171 of the temperature sensor 317 of electrode unit M16.

[0049] The grounding terminal 3171 of the temperature sensor 317 of each of the electrode units M3, M4, M8, and M10 is shorted to the second grounding trace 3132-2. The specific routing of the second grounding trace 3132-2 is as follows: from the end of the wiring part 312 upwards and to the right ( Figure 8 The electrode extends from the middle (to the left) and then upwards, passing through electrode units M8, M9, M4, M3 and their corresponding connecting parts 311, and connecting to the grounding pad 3142 corresponding to the grounding terminal 3171 of the temperature sensor 317 of each electrode unit M8 and M3; then it returns from electrode unit M3 and passes through electrode unit M4 and connects to the grounding pad 3142 corresponding to the grounding terminal 3171 of the temperature sensor 317 of electrode unit M4, and then passes through electrode unit M9 and its corresponding connecting parts 311 to reach electrode unit M10 and connects to the grounding pad 3142 corresponding to the grounding terminal 3171 of the temperature sensor 317 of electrode unit M10.

[0050] The grounding terminals 3171 of the temperature sensors 317 of electrode units M1, M2, M5, and M7 are all short-circuited to the third grounding trace 3132-3. The specific routing of the third grounding trace 3132-3 is as follows: from the end of the wiring part 312 upwards and to the left (…). Figure 8 The electrode extends upwards from the center (to the right) and then passes through electrode units M7, M6, M1, M2 and their corresponding connecting parts 311, connecting to the grounding pads 3142 corresponding to the grounding terminals 3171 of the temperature sensors 317 of each electrode unit M7 and M2. Then it returns from electrode unit M2, passes through electrode unit M1 and connects to the grounding pads 3142 corresponding to the grounding terminals 3171 of the temperature sensors 317 of electrode unit M1. Then it passes through electrode unit M6 and its corresponding connecting parts 311 to reach electrode unit M5 and connects to the grounding pads 3142 corresponding to the grounding terminals 3171 of the temperature sensors 317 of electrode unit M5.

[0051] The grounding terminals 3171 of the temperature sensors 317 of electrode units M11, M13, M17, and M18 are shorted in parallel to the fourth grounding trace 3132-4. The specific routing of the fourth grounding trace 3132-4 is as follows: from the end of the connector 312 upwards and to the left... Figure 8The circuit extends downwards from the center (to the right) and then passes through electrode units M13, M12, M17, M18 and their corresponding connecting parts 311, connecting to the grounding pads 3142 corresponding to the grounding terminals 3171 of the temperature sensors 317 of each electrode unit M13 and M18. Then it returns from electrode unit M18, passes through electrode unit M17 and connects to the grounding pads 3142 corresponding to the grounding terminals 3171 of the temperature sensors 317 of electrode unit M17. Then it passes through electrode unit M12 and its corresponding connecting parts 311 to reach electrode unit M11 and connects to the grounding pads 3142 corresponding to the grounding terminals 3171 of the temperature sensors 317 of electrode unit M11.

[0052] The ends of the four grounding traces 3132 on the wiring section 312 all pass through the corresponding parts of the wiring section 312 and are connected one-to-one with the four corresponding gold fingers 3121 on the front of the wiring section 312. When the first electrode unit 310A is provided with diodes 318 corresponding to each temperature sensor 317, the corresponding grounding traces 3132 need to be electrically connected to the grounding pads 3142 corresponding to the corresponding temperature sensor 317 through the corresponding diodes 318 and the corresponding anode pads (unlabeled) and cathode pads (unlabeled) of the diodes 318.

[0053] Key reference Figure 9 As shown, this is the wiring diagram of the signal traces 3133 on the back of the flexible circuit board 313. The wiring scheme of the four signal traces 3133 is described in detail below from the front view of the flexible circuit board 313:

[0054] The signal terminals 3172 of the temperature sensors 317 of electrode units M4, M7, M13, and M20 are all connected in parallel to the first signal trace 3133-1; the first signal trace 3133-1 consists of four branches extending upward from the end of the connector 312 along its left and right sides respectively. The specific routing of these four branches is as follows: from the end of the connector 312 upward and to the left... Figure 9 A branch extending upwards from the right side of the electrode unit M7 passes through the corresponding connection part 311 and connects to the signal pad 3143 corresponding to the signal terminal 3172 of the temperature sensor 317 of the electrode unit M7; it extends upwards and to the left from the end of the wiring part 312. Figure 9 Another branch extending downwards from the right side of the middle extends through the corresponding connection part 311 and connects to the signal pad 3143 corresponding to the signal terminal 3172 of the temperature sensor 317 of the electrode unit M13; from the end of the wiring part 312 upwards and to the right ( Figure 9 A branch extending from the left side of the middle extends upward and passes sequentially through electrode units M8, M9 and the corresponding connecting part 311 to reach electrode unit M4 and connects to the signal pad 3143 corresponding to the signal terminal 3172 of the temperature sensor 317 of electrode unit M4; from the wiring part 312 to the right side ( Figure 9 Another branch (on the left side of the middle) extends downward and passes through electrode units M14, M15 and corresponding connecting parts 311 in sequence to reach electrode unit M20 and is connected to the signal pad 3143 corresponding to the signal terminal 3172 of the temperature sensor 317 of electrode unit M20.

[0055] The signal terminals 3172 of the temperature sensors 317 of electrode units M5, M8, M11, and M14 are all connected in parallel to the second signal trace 3133-2. The second signal trace 3133-2 branches upward from the end of the connector 312 and extends along its left and right sides to form four branches. The specific routing of these four branches is as follows: from the end of the connector 312 upward and to the right... Figure 9 A branch extending upwards from the left side of the middle section passes through the corresponding connection part 311 and connects to the signal pad 3143 corresponding to the signal terminal 3172 of the temperature sensor 317 of the electrode unit M8; it extends upwards and to the right from the end of the wiring part 312. Figure 9 Another branch extending downwards from the left side of the middle extends through the corresponding connection part 311 and connects to the signal pad 3143 corresponding to the signal terminal 3172 of the temperature sensor 317 of the electrode unit M14; from the end of the wiring part 312 upwards and to the left ( Figure 9 A branch extending upwards from the right side of the terminal block passes sequentially through electrode units M7, M6 and their corresponding connecting parts 311 to reach electrode unit M5 and connects to the signal pad 3143 corresponding to the signal terminal 3172 of the temperature sensor 317 of electrode unit M5; the branch extends upwards and to the left from the end of the wiring part 312. Figure 9 Another branch extending from the right side of the middle goes down and passes through electrode units M13, M12 and corresponding connecting parts 311 in sequence to reach electrode unit M11 and connects to the signal pad 3143 corresponding to the signal terminal 3172 of the temperature sensor 317 of electrode unit M11.

[0056] The signal terminals 3172 of the temperature sensors 317 of electrode units M2, M10, M16, and M17 are all connected in parallel to the third signal trace 3133-3. The third signal trace 3133-3 branches upward from the end of the wiring part 312 and extends along its left and right sides to form four branches. The specific routing of these four branches is as follows: from the end of the wiring part 312 upward and to the left... Figure 9 A branch extending upwards from the right side of the terminal block passes sequentially through electrode units M7, M6, M1 and their corresponding connecting parts 311 to reach electrode unit M2 and connects to the signal pad 3143 corresponding to the signal terminal 3172 of the temperature sensor 317 of electrode unit M2; the branch extends upwards and to the left from the end of the wiring part 312. Figure 9Another branch extending downwards from the right side of the terminal block passes sequentially through electrode units M13, M12 and corresponding connecting parts 311 to reach electrode unit M17 and connects to the signal pad 3143 corresponding to the signal terminal 3172 of the temperature sensor 317 of electrode unit M17; from the end of the wiring part 312 upwards and to the right ( Figure 9 A branch extending upwards from the left side of the terminal block (M10) passes sequentially through electrode units M8, M9 and their corresponding connecting parts 311 to reach electrode unit M10 and connects to the signal pad 3143 corresponding to the signal terminal 3172 of the temperature sensor 317 of electrode unit M10; the branch extends upwards and to the right from the end of the wiring part 312. Figure 9 Another branch extending from the left side of the middle extends downward and passes through electrode units M14, M15 and corresponding connecting parts 311 in sequence to reach electrode unit M16 and is connected to the signal pad 3143 corresponding to the signal terminal 3172 of the temperature sensor 317 of electrode unit M16.

[0057] The signal terminals 3172 of the temperature sensors 317 of electrode units M1, M3, M18, and M19 are all connected in parallel to the fourth signal trace 3133-4. The fourth signal trace 3133-4 consists of four branches extending upwards from the end of the wiring part 312 and then to the left and right sides respectively. The specific routing of these four branches is as follows: from the end of the wiring part 312 upwards and to the left... Figure 9 A branch extending upwards from the right side of the terminal block passes sequentially through electrode units M7, M6 and corresponding connecting parts 311 to reach electrode unit M1 and connects to the signal pad 3143 corresponding to the signal terminal 3172 of the temperature sensor 317 of electrode unit M1; from the end of the wiring part 312 upwards and to the left ( Figure 9 Another branch extending downwards from the right side of the terminal block passes sequentially through electrode units M13, M12, M17 and corresponding connecting parts 311 to reach electrode unit M18 and connects to the signal pad 3143 corresponding to the signal terminal 3172 of the temperature sensor 317 of electrode unit M18; from the end of the wiring part 312 upwards and to the right ( Figure 9 A branch extending upwards from the left side of the terminal block passes sequentially through electrode units M8, M9, M4 and their corresponding connecting parts 311 to electrode unit M3, and connects to the signal pad 3143 corresponding to the signal terminal 3172 of the temperature sensor 317 of electrode unit M3; from the end of the wiring part 312 upwards and to the right ( Figure 9 Another branch extending downwards from the left side of the electrode unit M19 passes through electrode units M14, M15, M20 and corresponding connecting parts 311 in sequence, and connects to the signal pad 3143 corresponding to the signal terminal 3172 of the temperature sensor 317 of electrode unit M19.

[0058] The ends of the four signal traces 3133 on the wiring section 312 are respectively connected to the four corresponding gold fingers 3121 on the back of the wiring section 312. It can be understood that although the ground trace 3132 and the signal trace 3133 are mostly located on the back of the flexible circuit board 313, they need to penetrate through the corresponding parts of the flexible circuit board 313 and be electrically connected to the corresponding ground pad 3142 or signal pad 3143 on the front of the flexible circuit board 313. In addition, the four ground traces 3132 and four signal traces 3133 are arranged in parallel on the back of the flexible circuit board 313 and do not interfere with each other. However, due to wiring requirements, the ground traces 3132 and signal traces 3133 will inevitably cross in some places on the flexible circuit board 313. To avoid interference, the ground traces 3132 or signal traces 3133 located at the crossing points will pass through the corresponding part of the flexible circuit board 313 to the front of the flexible circuit board 313 for jumpering, and then pass back to the back of the flexible circuit board 313 to continue the routing. Therefore, there will also be shorter portions of the ground traces 3132 and signal traces 3133 on the front of the flexible circuit board 313, and the portion of the ground traces 3132 and signal traces 3133 on the front of the flexible circuit board 313 will also not interfere with each other.

[0059] The following is combined Figure 10 As shown, the wires (not shown) of electrode 30 are plugged into connector 40 of adapter 20 to achieve circuit connection between electrode 30 and adapter 20. In the circuit connection, twenty electrode units 310 are arranged in four rows and five columns. Each electrode unit 310 is connected to AC trace 3131. The four electrode units M15, M9, M6, and M12 in the fifth column do not have corresponding temperature sensors 317 and are all second electrode units 310B. The remaining sixteen first electrode units 310A, which have temperature sensors 317, are arranged in four rows and four columns in the circuit. Four ground traces 3132 are respectively connected in parallel to the ground terminals 3171 of multiple temperature sensors 317 in their corresponding row. Four signal traces 3133 are respectively connected in parallel to the signal terminals 3172 of multiple temperature sensors 317 in their corresponding column. The signal terminals 3172 of multiple temperature sensors 317 that are shorted in parallel with the same grounding trace 3132 are respectively connected to different signal traces 3133, and the ground terminals 3171 of multiple temperature sensors 317 that are connected in parallel with the same signal trace 3133 are respectively connected to different grounding traces 3132.

[0060] The adapter 20 includes a controller 21, multiple sets of analog-to-digital converter modules 22, a communication unit 23, multiple sets of voltage-reducing resistors 24, multiple sets of grounding switches 25, and a power module 26. The power module 26 provides DC power VCC to the controller 21, the analog-to-digital converter modules 22, and the communication unit 23. Each of the multiple sets of analog-to-digital converter modules 22, the multiple sets of voltage-reducing resistors 24, and the multiple sets of grounding switches 25 is respectively configured to correspond one-to-one with each electrode plate 30. In this embodiment, the analog-to-digital converter module 22 provides four detection channels A, B, C, and D for the electrode plate 30. The controller 21 controls the on / off state of each detection channel in the corresponding set of analog-to-digital converter modules 22 and each grounding switch in the corresponding set of grounding switches 25. In this embodiment, each set of grounding switches 25 includes a first grounding switch 25-1, a second grounding switch 25-2, a third grounding switch 25-3, and a fourth grounding switch 25-4.

[0061] The adapter 20 is provided with an AC line 27 for transmitting AC signals. The AC trace 3131 of the electrode 30 is connected to the AC line 27 to transmit AC signals. The first grounding trace 3132-1, the second grounding trace 3132-2, the third grounding trace 3132-3, and the fourth grounding trace 3132-4 of the electrode 30 are respectively electrically connected to the first grounding switch 25-1, the second grounding switch 25-2, the third grounding switch 25-3, and the fourth grounding switch 25-4 in the corresponding group of grounding switches 25 on the adapter 20 and then grounded. The first signal trace 3133-1, the second signal trace 3133-2, the third signal trace 3133-3, and the fourth signal trace 3133-4 of the electrode 30 are respectively connected to the four detection channels A, B, C, and D of the analog-to-digital conversion module 22 of the adapter 20.

[0062] In terms of circuit layout, the twenty electrode units 310 are arranged in four rows and five columns, with five electrode units 310 in each row, located in the first to fifth columns respectively. The five electrode units 310 in the first row are electrode units M20, M14, M16, M19, and M15 in sequence; the five electrode units 310 in the second row are electrode units M4, M8, M10, M3, and M9 in sequence; the five electrode units 310 in the third row are electrode units M7, M5, M2, M1, and M6 in sequence; and the five electrode units 310 in the fourth row are electrode units M13, M11, M17, M18, and M12 in sequence.

[0063] Each electrode unit 310 in the first four columns is a first electrode unit 310A. The grounding terminals 3171 of the temperature sensors 317 of each first electrode unit 310A in the same row are all shorted in parallel to the same grounding trace 3132. The signal terminals 3172 of the corresponding temperature sensors 317 of each first electrode unit 310A in the same column are all connected in parallel to the same signal trace 3133 and then connected to the same detection channel. Each electrode unit 310 in the fifth column is a second electrode unit 310B. Each second electrode unit 310B does not have a temperature sensor 317 and is not connected to any grounding trace 3132 or signal trace 3133. That is to say, in terms of circuit connection, each temperature sensor 317 is similar to the first electrode unit 310A, and is arranged in four rows and four columns. Specifically, the grounding terminals 3171 of the temperature sensors 317 of the four electrode units M20, M14, M16, and M19 in the first row are all shorted in parallel to the first grounding trace 3132-1; the grounding terminals 3171 of the temperature sensors 317 of the four electrode units M4, M8, M10, and M3 in the second row are all shorted in parallel to the second grounding trace 3132-2; the grounding terminals 3171 of the temperature sensors 317 of the four electrode units M7, M5, M2, and M1 in the third row are all shorted in parallel to the third grounding trace 3132-3; and the grounding terminals 3171 of the temperature sensors 317 of the four electrode units M13, M11, M17, and M18 in the fourth row are all shorted in parallel to the fourth grounding trace 3132-4. The signal terminals 3172 of the temperature sensors 317 of the four electrode units M20, M4, M7, and M13 in the first column are all connected in parallel to the first signal trace 3133-1. The signal terminals 3172 of the temperature sensors 317 of the four electrode units M14, M8, M5, and M11 in the second column are all connected in parallel to the second signal trace 3133-2. The signal terminals 3172 of the temperature sensors 317 of the four electrode units M16, M10, M2, and M17 in the third column are all connected in parallel to the third signal trace 3133-3. The signal terminals 3172 of the temperature sensors 317 of the four electrode units M19, M3, M1, and M18 in the fourth column are all connected in parallel to the fourth signal trace 3133-4.

[0064] In short, in terms of circuit connection, the signal terminals 3172 of each temperature sensor 317 of each first electrode unit 310A located in the same row are connected to the adapter 20 through their respective corresponding signal traces 3133; the ground terminals 3171 of each temperature sensor 317 of each first electrode unit 310A located in the same row are short-circuited to ground through the same ground trace 3132. The ground terminals 3171 of each temperature sensor 317 of each first electrode unit 310A located in the same column are grounded through their respective corresponding ground traces 3132; the signal terminals 3172 of each temperature sensor 317 of each first electrode unit 310A located in the same column are all connected to the adapter 20 through the same signal trace 3133. The signal terminals 3172 of each temperature sensor 317 of each first electrode unit 310A located in different rows and columns are connected to the adapter 20 through different signal traces 3133. The ground terminals 3171 of each temperature sensor 317 of each first electrode unit 310A located in different rows and columns are also grounded through different ground traces 3132. The dielectric elements 315 of each electrode unit 310 located in each row are connected in parallel to the AC trace 3131 and connected to the AC line 27 of the adapter 20 through the AC trace 3131.

[0065] When it is necessary to apply an AC signal to each electrode unit 310 of the corresponding electrode plate 30, all four grounding switches 25 are disconnected, the electric field generator 10 outputs an AC signal to the corresponding AC line 27 in the adapter 20, and applies it to the dielectric element 315 of each electrode unit 310 through the AC trace 3131 connected to the AC line 27.

[0066] When it is necessary to collect the temperature detection signals of each temperature sensor 317 on an electrode plate 30, there is no AC signal transmission between the dielectric element 315 of each electrode unit 310 and the AC line 27 of the adapter 20, and the four signal traces 3133 are always conducting. First, close the grounding switch 25-1 and open the other grounding switches 25-2 to 25-4. The four detection channels A, B, C and D of the analog-to-digital conversion module 22 can simultaneously obtain the temperature detection signals of electrode units M20, M14, M16 and M19. Then, close the grounding switch 25-2 and open the other grounding switches 25-1, 25-3 and 25-4. The four detection channels A, B, C and D of the analog-to-digital conversion module 22 can simultaneously obtain the temperature detection signals of electrode units M20, M14, M16 and M19. Detection channels A, B, C, and D can simultaneously acquire temperature detection signals from electrode units M4, M8, M10, and M3. Then, grounding switch 25-3 is closed, and other grounding switches 25-1, 25-2, and 25-4 are opened. The four detection channels A, B, C, and D of the analog-to-digital conversion module 22 can simultaneously acquire temperature detection signals from electrode units M7, M5, M2, and M1. Finally, grounding switch 25-4 is closed, and other grounding switches 25-1, 25-2, and 25-3 are opened. The four detection channels A, B, C, and D of the analog-to-digital conversion module 22 can simultaneously acquire temperature detection signals from electrode units M13, M11, M17, and M18. In this way, temperature detection signals from all temperature sensors 317 can be acquired. The transmission of AC signals to electrode units 310 and the transmission of DC signals from electrode units 310 for temperature detection signal acquisition are performed separately.

[0067] The communication unit 23 is controlled by the controller 21 and serially transmits the digital signals converted by the analog-to-digital converter 22, and sends the digital signals to the electric field generator 10. When any of the multiple digital signals received by the electric field generator 10 exceeds the preset threshold set in the controller 21, the voltage, current or power of the AC signal output by the electric field generator 10 can be appropriately reduced to avoid the temperature of a certain electrode unit 310 becoming too high and causing low-temperature burns to the patient's skin.

[0068] The above are merely preferred embodiments of this application and are not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. An electrode tab, characterized by: The electrode array comprises a plurality of electrode units and a plurality of connecting portions connecting adjacent two electrode units, the electrode units comprise a plurality of first electrode units provided with temperature sensors and a plurality of second electrode units not provided with temperature sensors; the connecting portions comprise a plurality of first connecting portions arranged in a row direction and a plurality of second connecting portions arranged in a column direction; the plurality of first electrode units, the plurality of second electrode units, the plurality of first connecting portions and the plurality of second connecting portions jointly form two main stems arranged in a recessed manner towards the center of the electrode array and symmetric to each other, and a plurality of branches extending in the row direction are arranged on both sides of the main stems respectively, and a wiring portion is arranged between adjacent two second connecting portions.

2. The electrode pad of claim 1, wherein: Only one first electrode unit is arranged on each branch, and the first electrode unit arranged on each branch is connected with a corresponding main stem through only one first connecting portion.

3. The electrode pad of claim 2, wherein: The first electrode unit arranged on each branch is connected with a first electrode unit or a second electrode unit arranged on a corresponding main stem through only one first connecting portion.

4. The electrode sheet according to any one of claims 1 to 3, characterized by: Four branches are arranged on each main stem respectively.

5. The electrode pad of claim 4, wherein: Two branches on each main stem extend towards the inside of the electrode array, and the remaining two branches extend towards the outside of the electrode array.

6. The electrode patch of claim 5, wherein: The electrode units are twenty in total and comprise sixteen first electrode units and four second electrode units, and the twenty electrode units are arranged in four rows and six columns, each of the first row and the fourth row is provided with four electrode units arranged in the second column to the fifth column, and each of the second row and the third row is provided with six electrode units arranged in the first column to the sixth column; each electrode unit arranged in the second row and the third row and in the second column and the fifth column is a second electrode unit, and the remaining electrode units are first electrode units.

7. The electrode pad of claim 6, wherein: The first electrode unit arranged in the second column of the first row, the second electrode unit arranged in the second column of the second row, the first electrode unit arranged in the third column of the second row, the first electrode unit arranged in the third column of the third row, the second electrode unit arranged in the second column of the third row, the first electrode unit arranged in the second column of the fourth row and the second connecting portions and the first connecting portions arranged between the above electrode units jointly form one main stem; The first electrode unit arranged in the fifth column of the first row, the second electrode unit arranged in the fifth column of the second row, the first electrode unit arranged in the fourth column of the second row, the first electrode unit arranged in the fourth column of the third row, the second electrode unit arranged in the fifth column of the third row, the first electrode unit arranged in the fifth column of the fourth row and the second connecting portions and the first connecting portions arranged between the above electrode units jointly form another main stem.

8. The electrode patch of claim 6, wherein: The branches on each main stem are arranged in the first row, the second row, the third row and the fourth row respectively, two branches arranged in each of the first row and the fourth row extend towards the inside of the electrode array, and two branches arranged in each of the second row and the third row extend towards the outside of the electrode array.

9. The electrode patch of claim 1, wherein: The electrode array is provided with a plurality of ground traces, a plurality of signal traces and an AC trace, the first electrode units are arranged in multiple rows and multiple columns in circuit connection, the ground end of the temperature sensor of each first electrode unit in the same row is connected to the same ground trace, the signal end of the temperature sensor of each first electrode unit in the same column is connected to the same signal trace, and a plurality of electrode units are connected to the same AC trace.

10. A tumor electric field treatment device, characterized by: The electrode array is provided with a plurality of ground traces, a plurality of signal traces and an AC trace, the first electrode units are arranged in multiple rows and multiple columns in circuit connection, the ground end of the temperature sensor of each first electrode unit in the same row is connected to the same ground trace, the signal end of the temperature sensor of each first electrode unit in the same column is connected to the same signal trace, and a plurality of electrode units are connected to the same AC trace. It comprises an electric field generator and a plurality of pairs of electrode pieces as claimed in any one of claims 1 to 9, and the electric field generator is electrically connected with each electrode piece.

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