CN207821815U - A kind of flexibility dry-type electrode - Google Patents

Abstract

The utility model is related to a kind of flexible dry-type electrode, which includes electrode body and electrical interconnecting means, and wherein electrode body includes electrode base and the array architecture probe that is arranged on electrode base；Electrical interconnecting means are drawn from electrode base, are electrically connected with array architecture probe；Array architecture probe includes several probes along electrode base annular arrangement, and the end that probe array middle probe is formed by after several probe arrangements forms the three dimension arch curved surface of recess.The utility model has the advantages that without conducting resinl/cream, simple to operate, impedance is low, long time stability, flexibility, wearing comfort is safe, at low cost, processing technology is simple.

Description

A flexible dry electrode

technical field

The utility model relates to an electrode in the field of medical equipment and wearable electronics, in particular to a flexible dry electrode for measuring brain electrical signals in hair-covered areas.

Background technique

Electroencephalogram signal (EEG) is the basic signal of the human body, which can reflect the health status of the human body, cognitive activities and other information, and is an important parameter for brain science research, human physiological research and clinical diagnosis of brain diseases. At the same time, the monitoring and intervention of EEG signals is also an important part of the research and application of brain-computer interface (BCI). The acquisition of EEG signals in hair-covered areas requires the use of EEG electrodes, and the key to obtaining high-reliability and high-stability EEG signals is to develop EEG electrodes with good performance. Although the current technology has made some progress in the acquisition and processing of EEG signals, there are still great challenges in reliable EEG electrode technology.

Acquiring high-reliability EEG signals requires EEG electrodes with good performance, and requires small and stable contact electrodes between EEG electrodes and the scalp. At present, wet electrodes are widely used in clinical and scientific research because of their reliability and high signal-to-noise ratio in acquiring EEG signals. Wet electrode technology uses conductive gel to reduce the contact impedance between the electrode and the scalp, but it requires corresponding preparation of the scalp before the experiment, which is time-consuming and complex in operation; in addition, the conductive gel makes the subject's hair become thinner. Dirty, messy, and hardened over time, affecting test results. The disadvantage of wet electrodes limits the development of emerging EEG applications.

Dry electrode technology does not require the use of conductive paste during use, and has the characteristics of instant wear and use, convenience and quickness, and is suitable for long-term measurement, which promotes the development of EEG applications. In recent years, dry electrode technology has been widely concerned by researchers. Among the existing dry electrodes, the contact metal electrode is not comfortable; the MEMS array microneedle electrode punctures the stratum corneum and there is a risk of infection; the preparation process of the active electrode is complicated; The signal-to-noise ratio of the acquired EEG signal is low. The shortcomings of the existing dry electrode technology make the dry electrode technology continue to develop.

Contents of the invention

In order to solve the technical problems of high contact resistance and poor comfort in existing dry electrodes, the utility model provides a flexible dry electrode, which has the advantages of no need for conductive glue/paste, simple and convenient operation, low impedance, long-term stability and reliability, flexibility, It has the advantages of comfortable and safe wearing, low cost and simple processing technology.

The technical scheme adopted by the flexible dry electrode of the utility model is as follows: the flexible dry electrode includes an electrode body and an electrical connector, wherein the electrode body includes an electrode bottom and an array structure probe arranged on the electrode bottom; the electrical connector Lead out from the bottom of the electrode and electrically connect with the array structure probe; the array structure probe includes a number of probes evenly arranged along the bottom of the electrode, and the ends of the probes in the probe array formed after the arrangement of several probes are formed A concave three-dimensional curved surface.

Preferably, among the plurality of probes, the probes at different positions at the bottom of the electrode have different lengths, and the length of the probe at the center of the bottom of the electrode is shorter than the length of the probe at the periphery of the bottom of the electrode, so that the probes formed after arrangement The ends of the probes in the array form a concave three-dimensional curved surface.

Preferably, the plurality of probes have a slope, and the ends of the probes at different positions on the bottom of the electrode have different slopes, so that the ends of the probes in the probe array formed after the arrangement form a concave three-dimensional arc surface.

Preferably, the ends of the probes at different positions on the bottom of the electrode have different slopes, including slopes with different slopes and different directions.

It can be known from the above technical solutions that compared with the prior art, the new flexible dry electrode designed by the utility model has the advantage that the electrode is composed of two parts: a conductive flexible dry electrode body and an electrical connector. Among them, the conductive flexible dry-type electrode body is made of flexible composite conductive material, which has both flexibility and good conductivity; the electrode body is divided into two parts: the array structure probe and the bottom of the electrode; the probe is a cylinder, cone or other shapes, and the probe The number is generally 10-25, which are arranged circularly along the bottom of the electrode. The probes can pass through the hair and directly contact the scalp; the probes are of different lengths and arranged in a three-dimensional arc surface, which can fully contact the scalp and can suppress motion artifacts. Improve the quality and stability of the collected signal; the bottom of the array structure probe and the electrode is a circular chamfer structure, which is not easy to be broken during use; Electrical Connector - The contact resistance of the electrode body and facilitates connection to the measurement circuit.

Description of drawings

Fig. 1 is one of overall structural representation of the utility model;

Fig. 2 is the second overall structure schematic diagram of the utility model;

Fig. 3 is the schematic diagram that the probes of the present invention are arranged in an arc-shaped curved surface;

Fig. 4 is the side view of Fig. 3;

Figure 5 is a schematic diagram of the structure of a single probe.

Detailed ways

The utility model will be described in detail below in conjunction with specific embodiments and accompanying drawings, but the implementation of the utility model is not limited thereto.

Example

As shown in Figures 1 and 2, this example provides a flexible dry electrode for collecting EEG signals in hair-covered areas, which structurally includes an electrode body and an electrical connector 3, wherein the electrode body includes an electrode bottom 2 and a row The array structure probe 1 is arranged on the bottom of the electrode, and the electrode bottom 2 is a flat sheet structure; surface.

Array structure probe 1 is made of flexible conductive composite material. A single probe is a cylinder, cone or other shape. Probes at different positions have different lengths. The length of the probe located at the center of the bottom 2 of the electrode is shorter than the length of the probe located at the periphery of the bottom 2 of the electrode. The ends of the probes in the probe array formed by the arrangement of several probes form a three-dimensional arc Shaped curved surface (that is, spherical), the three-dimensional curved curved surface is concave, the periphery is of equal height, and the lowest point is located at the center of the electrode bottom 2, as shown in Figures 3 and 4, so that the array structure probe 1 is easy to contact with the scalp. The electrode bottom 2 is used to connect several probes on the array structure probe 1 and the electrical connector 3, and the ends of several probes and the edges of the electrode bottom 2 adopt a circular chamfering structure, so that it is not easy to be broken during use .

In order to facilitate the array structure probe 1 to fully contact with the scalp, the probe of the present invention can also adopt the structure shown in Figure 5, the probe is in the shape of a cylinder, and its end is not flat, but has an inclined plane; The ends of the probes at different positions on the bottom 2 have different slopes (for example, the directions of the slopes are different and the slopes are different), so that the ends of the arranged probes form a concave three-dimensional arc-shaped surface, and the outer circumference of the three-dimensional arc-shaped surface Contoured, with the lowest point at the center of the bottom 2 of the electrodes.

The electrode body is made of conductive rubber or conductive silica gel, that is, the base material is rubber or silica gel, and the filler is carbon-based conductive filler (such as carbon black, carbon nanotubes, graphene, etc.) or metal-based conductive filler (such as silver powder, aluminum plating, etc.) at least one of silver, nickel powder, etc.). For example, carbon black is used to dope rubber or silver powder is used to dope silica gel, and another example is to use aluminum silver-plated powder to dope silica gel.

The electrical connector 3 is used to connect with the measuring circuit, and the electrical connector 3 adopts an integral molding process, is integrally cast, and is connected with the electrode body. The electrical connector 3 can be a metal conductive snap button, a metal conductive connecting piece or other metal connecting parts, and its metal material is gold, silver, copper or platinum.

The above-mentioned embodiment is a preferred implementation mode of the present utility model, but the implementation mode of the present utility model is not limited by the above-mentioned embodiment, and any other changes, modifications and substitutions made without departing from the spirit and principle of the present utility model , combination, and simplification, all should be equivalent replacement methods, and are all included in the protection scope of the present utility model.

Claims (10)

1. A flexible dry electrode, characterized in that it includes an electrode body and an electrical connector, wherein the electrode body includes an electrode bottom and an array structure probe arranged on the electrode bottom; the electrical connector is drawn from the electrode bottom, and The array structure probes are electrically connected; the array structure probes include a number of probes evenly arranged along the bottom of the electrode, and the ends of the probes in the probe array formed by the arrangement of several probes form a concave three-dimensional arc surface. 2. The flexible dry electrode according to claim 1, characterized in that, among the plurality of probes, the probes at different positions at the bottom of the electrode have different lengths, and the length of the probe at the center of the bottom of the electrode is shorter than that at the bottom of the electrode. The length of the probes on the periphery makes the ends of the probes in the probe array formed after the arrangement form a concave three-dimensional arc-shaped surface. 3. The flexible dry electrode according to claim 1, characterized in that, the plurality of probes have an inclined plane, and the ends of the probes at different positions on the bottom of the electrode have different inclined planes, so that the formed after arrangement The ends of the probes in the probe array form a concave three-dimensional curved surface. 4 . The flexible dry electrode according to claim 3 , wherein the ends of the probes at different positions on the bottom of the electrode have different slopes, including slopes with different slopes and different directions. 5. The flexible dry-type electrode according to any one of claims 1-4, wherein the outer periphery of the three-dimensional arc-shaped curved surface is of equal height, and the lowest point is located at the center of the bottom of the electrode. 6. The flexible dry electrode according to any one of claims 1-4, wherein the probes are cylinders or cones, and the number of probes is 10-25. 7. The flexible dry electrode according to any one of claims 1-4, characterized in that the bottom of the electrode is a flat sheet structure, and the electrical connector and the array structure probe are respectively located on the opposite side of the bottom of the electrode. two surfaces. 8. The flexible dry electrode according to any one of claims 1-4, characterized in that, the ends of the probes and the edges of the bottom of the electrodes all adopt circular chamfering structures. 9. The flexible dry electrode according to any one of claims 1-4, wherein the electrode body is made of conductive rubber or conductive silica gel. 10. The flexible dry electrode according to any one of claims 1-4, characterized in that, the electrical connector is a metal conductive snap button or a metal conductive connecting piece.