CN116236203A - Myoelectricity arm ring based on surface myoelectricity signal detection electrode and detection electrode - Google Patents
Myoelectricity arm ring based on surface myoelectricity signal detection electrode and detection electrode Download PDFInfo
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- CN116236203A CN116236203A CN202111495970.XA CN202111495970A CN116236203A CN 116236203 A CN116236203 A CN 116236203A CN 202111495970 A CN202111495970 A CN 202111495970A CN 116236203 A CN116236203 A CN 116236203A
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/24—Detecting, measuring or recording bioelectric or biomagnetic signals of the body or parts thereof
- A61B5/25—Bioelectric electrodes therefor
- A61B5/251—Means for maintaining electrode contact with the body
- A61B5/256—Wearable electrodes, e.g. having straps or bands
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/24—Detecting, measuring or recording bioelectric or biomagnetic signals of the body or parts thereof
- A61B5/25—Bioelectric electrodes therefor
- A61B5/263—Bioelectric electrodes therefor characterised by the electrode materials
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/24—Detecting, measuring or recording bioelectric or biomagnetic signals of the body or parts thereof
- A61B5/25—Bioelectric electrodes therefor
- A61B5/279—Bioelectric electrodes therefor specially adapted for particular uses
- A61B5/296—Bioelectric electrodes therefor specially adapted for particular uses for electromyography [EMG]
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/68—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient
- A61B5/6801—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient specially adapted to be attached to or worn on the body surface
- A61B5/6802—Sensor mounted on worn items
- A61B5/681—Wristwatch-type devices
Abstract
The invention relates to the technical field of intelligent wearing, and discloses a surface electromyographic signal detection electrode and an electromyographic arm ring comprising the detection electrode. The detection electrode is based on an FPC structure, one or more through holes are formed in one side, which is contacted with a detection target, of the detection electrode, flexible conductive materials are arranged in the through holes, and protrusions, which are opposite to the surface of the FPC structure, are formed in the through holes. The invention has a flexible and thin structure, can solve the technical problems that the existing intelligent wearing equipment, in particular an intelligent arm ring, has poor metal dry electrode laminating property and is easy to corrode and oxidize, and a gel electrode is not suitable for repeated use, has simple manufacturing method and lower cost, can carry out personalized design on an electrode circuit pattern according to the actual condition of a detection target, and has good application prospect.
Description
Technical Field
The invention relates to the field of intelligent wearing, in particular to a myoelectricity arm ring based on a surface myoelectricity signal detection electrode and the detection electrode.
Background
The surface electromyographic signal (Surface Electromyography, sEMG) is one of many bioelectric signals that are generated with muscle contraction and is an important non-invasive method of measuring muscle activity. In the application of the intelligent wearable device, the electrode sheet is attached to the skin surface of a human body, weak potential difference generated by muscle contraction on the skin surface can be recorded, and the surface electromyographic signals which can be used for processing are formed through amplification and conversion of a circuit. The recognition of gesture actions can be realized by collecting, processing and classifying the surface electromyographic signals of the forearm.
In the existing intelligent wearable equipment, particularly in an intelligent arm ring, most of electrodes for collecting surface electromyographic signals are metal dry electrodes. The metal dry electrode has low cost, but has poor fit with a human body, in the movement process, motion artifacts are easy to generate due to friction between equipment and skin, and electrochemical corrosion and oxidation are easy to generate due to substances such as sweat, body fluid and the like secreted by the human body, so that the signal detection precision is reduced. The gel electrode is a substituted product adopted for overcoming the defects of the metal dry electrode, has good fit with skin, can obtain high-quality surface electromyographic signals, is a disposable product or has extremely short service life, so that the gel electrode has high use cost and is mostly applied to medical detection.
In addition, because of the difference of human body structures, the sizes and the distribution of the small arm muscles of different people are different, the structure of the existing electrode product is fixed and generally not stretchable, the suitability of the electrode product and the small arm is poor, the wearability is poor, and the signal acquisition is incomplete easily.
Disclosure of Invention
The invention provides a myoelectricity arm ring based on a surface myoelectricity signal detection electrode and the detection electrode, which overcome the defects of a dry electrode and a wet electrode in the existing intelligent wearable equipment and are realized by the following specific technical scheme.
The first aspect of the invention provides an electromyographic arm ring based on a surface electromyographic signal detection electrode, which comprises:
the detection electrode is used for detecting and collecting surface electromyographic signals;
the main control unit is used for receiving and/or processing and/or transmitting the surface electromyographic signals;
the detection electrode is based on an FPC structure, and one side contacting with a detection target is provided with one or more through holes;
the one or more through holes are provided with a flexible conductive material therein.
In a specific implementation, the flexible conductive material may be filled into the through holes by in-situ casting, die bonding or bonding; due to the use of the flexible conductive material, electrode corrosion and oxidation caused by direct contact of the metal electrode and detection targets such as skin and the like are avoided, signal deviation caused by deterioration of electrode quality is avoided, and the service life of equipment is prolonged.
According to one possible manner of the first aspect of the present invention, the detection electrode includes a flexible support layer, a conductor circuit layer, and a cover protection layer;
the conductor circuit layer comprises an electrode detection site and a conductive circuit;
the one or more through holes are arranged on one side of the flexible supporting layer or the covering protective layer, which contacts the detection target, and the positions of the through holes correspond to the electrode detection sites;
when one side of the detection electrode contacts with the detection target, the flexible conductive material forms a path of surface electromyographic signals between the detection target and the electrode detection site through the through hole.
In a specific implementation, the conductor circuit layer may be obtained by a process of mask exposure, development, etching of the metal conductor layer/foil; the pattern of electrode detection sites and conductive circuits can be personalized by means of a mask.
According to one possible manner of the first aspect of the present invention, the flexible conductive material forms a protrusion in the through hole with respect to the surface of the FPC structure.
Because the flexible conductive material forms the bulge relative to the surface of the FPC structure, when the detection electrode contacts with a detection target (such as the skin of a small arm) at one side of the flexible conductive material, the flexible conductive material can form tight adhesion with the detection target, and has good suitability with the detection target due to the flexibility of the flexible conductive material, so that the accuracy and the stability of the detection electrode for acquiring the surface electromyographic signals are improved, and the motion artifact is reduced.
According to one manner that can be achieved in accordance with the first aspect of the invention, the flexible conductive material in the one or more vias is connected to the same lead interface by a conductive circuit. Through the lead interface, the main control unit or other signal receiving equipment of the arm ring can intensively receive the surface electromyographic signals detected and collected by the detection electrode and carry out subsequent processing.
According to one implementation manner of the first aspect of the present invention, the main control unit includes one or several of a signal amplifying module, an analog-to-digital conversion module and a communication module. The weak signals detected and collected by the receiving detection electrode can be amplified through the signal amplifying module; the analog-to-digital conversion module can perform mode conversion on the signal (for example, convert the analog signal into a digital signal) so as to process and analyze the signal; the communication module can transmit the original signals and/or the amplified signals and/or other processed signals to other devices such as external equipment, a monitoring terminal or output equipment and the like for subsequent operation.
The second aspect of the present invention provides an independent surface electromyographic signal detection electrode for detecting and collecting surface electromyographic signals;
the detection electrode is based on an FPC structure, and one side contacting with a detection target is provided with one or more through holes;
the one or more through holes are provided with a flexible conductive material therein.
According to one possible manner of the second aspect of the present invention, the detection electrode includes a flexible support layer, a conductor circuit layer, and a cover protection layer;
the conductor circuit layer comprises an electrode detection site and a conductive circuit;
the one or more through holes are arranged on one side of the flexible supporting layer or the covering protective layer, which contacts the detection target, and the positions of the through holes correspond to the electrode detection sites;
when one side of the detection electrode contacts with the detection target, the flexible conductive material forms a path of surface electromyographic signals between the detection target and the electrode detection site through the through hole.
According to one manner in which the second aspect of the present invention can be implemented, the flexible conductive material forms a protrusion in the through hole with respect to the surface of the FPC structure.
According to one manner in which the second aspect of the invention can be implemented, the flexible conductive material in the one or more vias is connected to the same lead interface by a conductive circuit.
According to one manner in which the second aspect of the invention can be implemented,
the substrate of the FPC structure is selected from one or more of polyimide, polyethylene terephthalate, aramid fiber ester and polyvinyl chloride; and/or
The flexible conductive material is selected from one or more of CNTs/PDMS composite conductive materials, conductive carbon black silicon rubber, graphite conductive rubber, nickel-coated graphite conductive silicon rubber, nickel carbonyl conductive rubber, silver-coated glass conductive rubber and silver-coated copper conductive rubber.
Based on the technical scheme, the invention has the following advantages:
the myoelectric arm ring uses the detection electrode based on the FPC structure, and the FPC can be attached or wrapped according to the shape of a detection target due to the flexibility of the FPC; the flexible conductive material is perforated and filled on one side of the contact detection target, and the bulge is formed, so that the detection electrode is tightly attached to the detection target at the electrode detection site and has good suitability, the accuracy and stability of acquiring the electromyographic signals are improved, and the motion artifact is reduced; and signal deviation of the metal electrode caused by corrosion and oxidation is eliminated. In addition, the manufacturing method of the detection electrode and the myoelectric arm ring is simple and low in cost, and the electrode circuit pattern can be personalized designed according to the actual condition of the detection target, so that the detection electrode and the myoelectric arm ring have good application prospects.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the invention, and that other drawings can be obtained from these drawings without inventive faculty for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a surface electromyographic signal detection electrode according to an alternative embodiment of the present invention;
FIG. 2 is a schematic diagram of detection sites connected to the same lead interface by conductive circuitry according to an alternative embodiment of the present invention;
fig. 3 is a schematic structural connection diagram of a master control unit according to an alternative embodiment of the present invention;
fig. 4 is a graph of an electromyographic signal test measured by a 16-channel detection electrode according to an alternative embodiment of the present invention.
Description of the drawings:
a flexible support layer of 1-FPC structure; a cover protection layer of the 2-FPC structure; 3-through holes; 4-flexible conductive material in the via; a 5-wire interface; 10-a signal amplification module; a 20-analog-to-digital conversion module; 30-a communication module.
Detailed Description
The embodiment of the invention provides a surface electromyographic signal detection electrode and an electromyographic arm ring based on the detection electrode, which are used for solving the technical problems that in the existing intelligent wearing equipment, particularly in the intelligent arm ring, the metal dry electrode has poor laminating property and is easy to corrode and oxidize, and the gel electrode is not suitable for repeated use.
In order to make the objects, features and advantages of the present invention more comprehensible, the technical solutions in the embodiments of the present invention are described in detail below with reference to the accompanying drawings, and it is apparent that the embodiments described below are only some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a surface electromyographic signal detection electrode according to an embodiment of the invention.
The invention provides a surface electromyographic signal detection electrode, which is provided with an FPC basic structure and comprises a flexible supporting layer 1, a covering protective layer 2 and a conductor circuit layer (not shown in the figure) positioned between the flexible supporting layer and the covering protective layer. The dimensions of the flexible supporting layer 1 and the covering protective layer 2 in fig. 1 do not represent the thickness ratio of two layers in the real object, and the thickness of the two layers in the real object can be arbitrarily selected according to the actual situation, and are not limited by the relative dimensional relationship in fig. 1.
The FPC infrastructure may be obtained by conventional FPC manufacturing processes. Wherein the flexible support layer 1 material may be selected from the group consisting of Polyimide (PI), polyethylene terephthalate (PET), aramid fiber ester, polyvinyl fluoride, etc., wherein Polyimide (PI), polyethylene terephthalate (PET) are also preferred in the present invention as the most conventional material for FPC.
The conductor circuit layer is obtained by a process of exposing, developing, and etching the metal layer disposed on the flexible support layer 1. The pattern of electrode detection sites and conductive circuits on the conductor circuit layer can be personalized by means of a mask (film) used in the exposure.
Based on the process flow, the pattern of the conductor circuit layer has designability, the conductor circuit layer, particularly the size, the number and the distribution of electrode detection sites can be designed and optimized according to the size and the shape characteristics of the detection targets, and meanwhile, the conducting circuit is designed in a matching way. Referring to fig. 2, fig. 2 shows a pattern of a conductor circuit layer obtained by personalized design according to an embodiment of the invention. In this embodiment, the human forearm muscle group is used as a detection target, and according to the size and shape characteristics thereof, 16 electrode detection sites are designed to be uniformly arranged side by side, and the conductive circuit layer pattern with the conductive circuit extending in a snake shape is designed. In addition, through personalized design, the conducting circuit can be connected in a collecting way to the same lead interface for the signal receiving equipment to receive the electromyographic signals in a concentrated way.
In another embodiment of the invention, the human forearm muscle group is taken as a detection target, two rows of conductor circuit layer patterns with electrode detection sites arranged in a staggered manner are designed according to the characteristics of different muscle shapes, and based on the design, the detection electrode can detect the myoelectric signals at different arm circumference positions of the human forearm but similar positions of the muscle characteristics and carry out subsequent analysis.
In other embodiments of the invention, the conductor circuit layer pattern of which the electrode detection site is matched with the strongest position of the electromyographic signal can be obtained by collecting the big data about the distribution characteristics of the human forearm muscle group after analysis; or according to the characteristics of the forearm muscle group of the specific figure person, designing and obtaining a customized conductor circuit layer pattern; thereby realizing the optimal electromyographic signal acquisition effect.
The cover protection layer 2 may be formed with reference to a conventional FPC manufacturing process after the formation of the conductor circuit layer. In one embodiment of the present invention, the cover protection layer 2 is pre-processed to form through holes matching with the electrode detection site patterns, and after the cover protection layer 2 is covered onto the conductor circuit layer, the through holes are in one-to-one correspondence with the electrode detection site positions.
In another embodiment of the present invention, the cover protection layer 2 may not be pretreated, and after the complete cover protection layer 2 is covered onto the conductor circuit layer, the hole is opened again according to the position of the electrode detection site. In this case, the flexible support layer 1 may be selectively perforated on one side of the contact detection target according to the position of the electrode detection site.
The present invention may also include the necessary adhesive layers in the FPC structure, with reference to conventional FPC manufacturing processes.
It should be noted that, in other embodiments, the structure of the surface electromyographic signal detection electrode is not limited to the flexible support layer 1 and/or the cover protection layer 2 in the above-described form.
As one means for achieving the core object of the present invention, in the FPC structure in which a through hole is formed on one side of a contact detection target, a flexible conductive material is filled in the through hole. Through the flexible conductive material, corrosion and oxidation of the electrode caused by sweat, body fluid and the like due to direct contact of the metal electrode and a detection target such as skin and the like are avoided, signal deviation caused by deterioration of the quality of the electrode can be effectively avoided, and the service life of equipment is prolonged.
At the same time, the flexible conductive material is caused to form a protrusion in the through-hole with respect to the surface of the FPC structure, as shown by flexible conductive material 4 in fig. 1. Due to the existence of the bulge, the bulge can be tightly attached to the detection target, and has good suitability with the detection target due to the flexibility of the bulge, so that the accuracy and the stability of the detection electrode for acquiring the surface electromyographic signals are improved, and the movement artifact is reduced.
The specific method of filling the flexible conductive material into the through-hole is not limited as long as the filling of the through-hole can be formed.
In one embodiment of the invention, the flexible conductive material is filled into the through holes by adopting an in-situ casting molding method, for example, before the conductive rubber is cured and molded, a liquid rubber precursor mixed with the conductive material is directly cast into a mold formed according to the position and the shape of the through holes, and the flexible conductive material filled in the through holes is formed after curing and demolding; for the conductive material with a three-dimensional structure, such as CNTs sponge, the conductive material can be cut into a shape and a size matched with the through holes, PDMS precursors are poured into the conductive material, and the flexible conductive material filled in the through holes is formed after curing and demolding.
In another embodiment of the invention, the flexible conductive material is filled into the through holes by direct bonding, the cured flexible conductive material is cut to a shape and size matching the through holes, and the flexible conductive material is directly filled into the through holes by a suitable bonding medium.
In another embodiment of the present invention, the flexible conductive material may also be filled into the vias by way of a molded connection.
The flexible conductive material used in the embodiments of the present invention may be selected from CNTs/PDMS composite conductive materials, conductive carbon black silicone rubber, graphite conductive rubber, nickel-coated graphite conductive silicone rubber, nickel carbonyl conductive rubber, silver-coated glass conductive rubber, silver-coated copper conductive rubber, but is not limited to these types, and those skilled in the art may further expand to select other types of materials having "flexible" and "conductive" characteristics.
As a specific application of the surface electromyographic signal detection electrode provided by the invention, the invention also provides an electromyographic arm ring based on the detection electrode, and the electromyographic arm ring comprises a detection electrode for detecting and collecting the surface electromyographic signal, and also comprises a main control unit connected with the detection electrode and can be used for receiving, processing and transmitting the surface electromyographic signal.
Referring to fig. 3, fig. 3 is a schematic diagram illustrating structural connection of a master control unit according to an embodiment of the invention.
In one embodiment of the present invention, the main control unit of the myoelectric arm ring includes a signal amplifying module 10, an analog-to-digital conversion module 20 and a communication module 30. After the surface electromyographic signals are detected and collected by the detection electrode, the weak signals are amplified by the signal amplification module 10 when necessary so as to be convenient for subsequent signal processing and transmission; the analog signals are converted into digital signals which can be digitally processed, analyzed and output by the analog-to-digital conversion module 20. The signal amplifying module 10 and the analog-to-digital conversion module 20 can be selectively integrated into a whole or independently arranged according to actual requirements.
In another embodiment of the invention, the electromyographic arm ring further comprises a communication module 30 for transmitting surface electromyographic signals to other devices. The device can be a self-contained monitoring and/or storage module of the myoelectric arm ring, and can also be an external monitoring terminal (such as a mobile phone, a tablet personal computer and the like) and a memory. The communication module 30 may be a wired communication mode or a wireless communication mode; in a typical example, the wireless communication module may be one of bluetooth, wiFi, NFC or a centralized combination.
In one embodiment of the invention, which uses an armband in particular, the detection electrode is wound around the human forearm one turn, if necessary with the aid of an elastic binding band, against the forearm; or the myoelectric arm ring integrated with the detection electrode is worn on the forearm of the human body. When the forearm muscle moves or the hand is driven to move through the forearm muscle, the myoelectric signals caused by the change of the muscle state at the wearing position are detected and collected, the myoelectric signals are processed and transmitted through each module of the main control unit, and the movement state, the gesture change and the like are identified and monitored based on the myoelectric signals. Referring to fig. 4, fig. 4 is a graph showing an electromyographic signal measured by a 16-channel detection electrode according to the present invention, wherein the abscissa is in ms, and the ordinate is an electromyographic voltage signal in μv.
The embodiment of the invention solves the technical problems that the existing intelligent wearing equipment, in particular an intelligent arm ring, has poor metal dry electrode laminating property, is easy to corrode and oxidize, and is not suitable for repeated use, and the provided detection electrode has a flexible and thin structure, can improve the laminating property with skin, can reduce motion artifacts, can acquire high-quality signals, and has longer service life; the manufacturing method is simple, the cost is low, the electrode circuit pattern can be individually designed according to the actual condition of the detection target, and the method has good application prospect.
The above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. An electromyographic arm ring based on a surface electromyographic signal detection electrode, comprising:
the detection electrode is used for detecting and collecting surface electromyographic signals;
the main control unit is used for receiving and/or processing and/or transmitting the surface electromyographic signals;
the detection electrode is based on an FPC structure, and one side contacting with a detection target is provided with one or more through holes;
the one or more through holes are provided with a flexible conductive material therein.
2. The myoelectric arm ring according to claim 1, wherein the detection electrode comprises a flexible support layer, a conductor circuit layer and a cover protection layer;
the conductor circuit layer comprises an electrode detection site and a conductive circuit;
the one or more through holes are arranged on one side of the flexible supporting layer or the covering protective layer, which contacts the detection target, and the positions of the through holes correspond to the electrode detection sites;
when one side of the detection electrode contacts with the detection target, the flexible conductive material forms a path of surface electromyographic signals between the detection target and the electrode detection site through the through hole.
3. Myoelectric arm ring according to claim 1 or 2, characterized in that the flexible conductive material forms a protrusion in the through hole with respect to the surface of the FPC structure.
4. The electromyographic arm ring of claim 2, wherein the flexible conductive material in the one or more vias is connected to the same lead interface by a conductive circuit.
5. The myoelectric arm ring according to claim 1, wherein the main control unit comprises one or more of a signal amplifying module, an analog-to-digital conversion module and a communication module.
6. The surface electromyographic signal detection electrode is characterized by being used for detecting and collecting surface electromyographic signals;
the detection electrode is based on an FPC structure, and one side contacting with a detection target is provided with one or more through holes;
the one or more through holes are provided with a flexible conductive material therein.
7. The detection electrode of claim 6, wherein the detection electrode comprises a flexible support layer, a conductor circuit layer, and a cover protection layer;
the conductor circuit layer comprises an electrode detection site and a conductive circuit;
the one or more through holes are arranged on one side of the flexible supporting layer or the covering protective layer, which contacts the detection target, and the positions of the through holes correspond to the electrode detection sites;
when one side of the detection electrode contacts with the detection target, the flexible conductive material forms a path of surface electromyographic signals between the detection target and the electrode detection site through the through hole.
8. The detection electrode according to claim 6 or 7, wherein the flexible conductive material forms a protrusion in the through hole with respect to a surface of the FPC structure.
9. The sensing electrode of claim 7, wherein the flexible conductive material in the one or more vias is connected to the same lead interface by a conductive circuit.
10. The detection electrode according to any one of claims 6 to 9, wherein:
the substrate of the FPC structure is selected from one or more of polyimide, polyethylene terephthalate, aramid fiber ester and polyvinyl chloride; and/or
The flexible conductive material is selected from one or more of CNTs/PDMS composite conductive materials, conductive carbon black silicon rubber, graphite conductive rubber, nickel-coated graphite conductive silicon rubber, nickel carbonyl conductive rubber, silver-coated glass conductive rubber and silver-coated copper conductive rubber.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111495970.XA CN116236203A (en) | 2021-12-08 | 2021-12-08 | Myoelectricity arm ring based on surface myoelectricity signal detection electrode and detection electrode |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111495970.XA CN116236203A (en) | 2021-12-08 | 2021-12-08 | Myoelectricity arm ring based on surface myoelectricity signal detection electrode and detection electrode |
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| CN116236203A true CN116236203A (en) | 2023-06-09 |
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| CN202111495970.XA Pending CN116236203A (en) | 2021-12-08 | 2021-12-08 | Myoelectricity arm ring based on surface myoelectricity signal detection electrode and detection electrode |
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- 2021-12-08 CN CN202111495970.XA patent/CN116236203A/en active Pending
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