CN220141666U - A dry electrode for non-invasive brain-computer interface devices - Google Patents

Abstract

The utility model discloses a dry electrode for non-invasive brain-computer interface equipment, which comprises a conductive base and electrode heads, wherein one end surface of the conductive base is provided with a conductive connecting part, the conductive connecting part is used for being connected with the brain-computer interface equipment, and the other end surface of the conductive base is provided with at least one electrode head; the electrode head comprises an electrode body made of elastic materials and a first conductive layer covered on the surface of the electrode body. The dry electrode disclosed by the utility model has the advantages of low cost, simple structure, easiness in manufacturing, simplicity and accuracy in electroencephalogram signal acquisition, stronger suitability and convenience in replacement and maintenance.

Description

A dry electrode for non-invasive brain-computer interface devices

Technical field

The utility model relates to the technical field of medical detection equipment, and in particular to a dry electrode used in non-invasive brain-computer interface equipment.

Background technique

Brain waves are the overall activity of brain nerve cells, including ion exchange, metabolism and other comprehensive external manifestations. EEG signals contain a large amount of information. Monitoring and analyzing EEG signals can not only provide effective treatment methods in the medical field, but can also be used in the fields of mind control such as AR.

There are two ways to collect EEG signals, namely invasive collection and non-invasive collection. The invasive collection method refers to opening the brain and implanting sensors inside. This method is not suitable for daily use by users. The non-invasive method of collecting EEG signals collects EEG signals by placing electrode sensors outside the cerebral cortex. This method is widely used in brain-computer interface products and is also common in daily life.

In non-invasive EEG signal collection, wet electrodes or dry electrodes can be used. When wet electrodes are used to measure EEG signals, the collected signals have high accuracy, but the measurement requires professional operators to apply conductive paste on the head of the subject. , to amplify the electroencephalogram signal. The use of wet electrodes has the following disadvantages: 1. The measurement operation is troublesome. The person being tested needs professionals to apply the paste, and the person being tested needs to wash their hair after the test. The steps are cumbersome and take a long time; 2. The stability of the conductive paste It gets worse with time, so the test time should not be too long; 3. The wet electrode needs to be directly connected to the computer using wires, so the environmental range of use is small. Therefore, the method of collecting EEG signals using wet electrodes is mostly used in professional medical treatment. Compared with using wet electrodes to measure EEG signals, dry electrodes use high input impedance technology and are less dependent on dielectrics. Dry electrodes use wireless communication technology to collect EEG signals, which reduces environmental constraints. Therefore, dry electrodes It can be applied to a wider range of scenarios, especially with the development of the times, EEG products are not only used in the medical field, but are also expanding into the consumer electronics field.

In this regard, the Chinese utility model patent application number 2022222164935 discloses a reusable thimble-type gold-plated brain electrode dry electrode, which includes a hollow plastic shell in the center, silver-plated copper parts and multiple gold-plated bullet pins. Each gold-plated bullet pin The bottoms are embedded in a plastic shell. The top of each gold-plated bullet pin is laid with conductive foam. The bottom of the silver-plated copper piece is in extrusion contact with the conductive foam. There is a threaded hole in the center of the silver-plated copper piece for electrical connection with external collection equipment. The structure of the thimble-type gold-plated EEG dry electrode is relatively complex. At the same time, the gold-plated elastic needle is in contact with the scalp. The gold-plated elastic needle is elastically deformed by the ups and downs of the scalp. However, the strength of the gold-plated elastic needle is relatively high. When it contacts the scalp, the scalp will contact the position. Has a strong stinging sensation.

Utility model content

In view of this, the present invention proposes a dry electrode for non-invasive brain-computer interface equipment to optimize the structure and improve the comfort of use.

In order to achieve the above purpose, the present utility model adopts the following technical solutions:

A dry electrode for non-invasive brain-computer interface equipment, including a conductive base and an electrode head;

One end surface of the conductive base is provided with a conductive connection part, the conductive connection part is used to connect with a brain-computer interface device, and the other end surface of the conductive base is provided with at least one electrode head;

The electrode head includes an electrode body made of elastic material and a first conductive layer covering the surface of the electrode body.

In order to better realize the above technical solution, optionally, the first conductive layer is a silver chloride layer.

Optionally, the electrode body is made of medical rubber.

Optionally, the conductive base includes a base body made of medical rubber and a second conductive layer covering the surface of the base body.

Optionally, the conductive connection part is a threaded column structure or a plug-in column structure.

Optionally, there are three electrode heads, and they are distributed in an equilateral triangle on the conductive base.

Optionally, the shape of the electrode head is T-shaped, the vertical section of the electrode head is connected to the conductive base, and the horizontal section of the electrode head is used to contact the human head.

Optionally, the transverse section of the electrode head has a circular arch structure.

Beneficial effects of this utility model:

The utility model is a dry electrode used for non-invasive brain-computer interface equipment. Compared with the existing technology, the adaptive ability of the electrode assembly of the EEG equipment is greatly improved. The electrode head and the electrode base are integrally connected. The elasticity of its own material ensures that the electrode head always fits tightly with the scalp at the designated acupoint during the detection of EEG signals. It has strong adaptability and can also avoid electrode slippage caused by the size of the head. The detected EEG The signal is more precise.

Description of the drawings

Figure 1 is a schematic perspective view of a dry electrode used in a non-invasive brain-computer interface device according to an embodiment of the present invention;

Figure 2 is a schematic three-dimensional view from another angle of a dry electrode used in a non-invasive brain-computer interface device according to an embodiment of the present invention;

Figure 3 is a front view of Figure 1;

Figure 4 is a cross-sectional view along the line A-A in Figure 3;

Conductive base 10, base body 101, second conductive layer 102, conductive connection part 103, electrode tip 20, electrode tip body 201, first silver chloride layer 202.

Detailed ways

The technical solution of the present utility model will be described in detail below with reference to the accompanying drawings and specific embodiments. Identical components are designated with the same reference numerals.

Referring to FIGS. 1 to 4 , this embodiment discloses a dry electrode for non-invasive brain-computer interface equipment, including a conductive base 10 and an electrode head 20 .

Among them, one end surface of the conductive base 10 is provided with a conductive connection part 103. The conductive connection part 103 is used to connect with a brain-computer interface device. The other end surface of the conductive base 10 is provided with at least one electrode head 20. The electrode head 20 includes an elastic The electrode tip body 201 is made of elastic material and the first conductive layer 202 covers the surface of the electrode tip body 201 made of elastic material.

In the dry electrode of the embodiment of the present application, the electrode head 20 is pressed against the scalp. Since the electrode head 20 has elastic properties, on the one hand, the elasticity of the electrode head 20 can be used to ensure that during the process of detecting EEG signals, the electrode head 20 is always in close contact with the scalp at the designated acupuncture point. The tight fit makes the detected EEG signals more accurate, and on the other hand, it can reduce the tingling sensation on the scalp.

In the embodiment of the present application, the conductive base 10 includes a base body 101 made of medical rubber and a second conductive layer 102 covering the surface of the base body 101. The electrode tip body 201 is also made of medical rubber. The base body 101 and the electrode body 201 are integrally formed, which is beneficial to reducing production costs and improving product yield.

In the embodiment of the present application, there are three electrode heads 20 , and they are distributed in an equilateral triangle on the conductive base 10 . In other optional embodiments, the number of electrode heads 20 can also be four, five, or more. The shape of the single electrode head 20 is T-shaped;

Among them, the vertical section of the electrode head 20 is connected to the conductive base 10, and the horizontal section of the electrode head 20 is used to contact the scalp. The horizontal section of the electrode head 20 has a circular arch structure. The electrode head 20 distributed in an equilateral triangle can realize independent adjustment of the electrode. The position of the head 20 enables the dry electrode to always fit tightly with the scalp during the measurement process, which can avoid electrode slippage due to the size of the head and has strong adaptability. The horizontal section of the electrode head 20 with a dome structure can The contact area with the skin is sufficient, thereby reducing the sense of pressure and skin tingling caused by the long-term EEG signal collection process, making the comfort higher.

In the embodiment of the present application, both the first conductive layer 202 and the second conductive layer 102 are silver chloride layers. As the conductive layer, the silver chloride layer has stable potential, good conductivity, and stable signals.

In the embodiment of the present application, the conductive connection part 103 is a threaded column structure or a plug-in column structure. Preferably, the conductive connection part 103 is a plug-in column structure, and the dry electrode is plugged in using the conductive connection part 103 of the plug-in column structure. In the preset holes of the brain-computer interface, the connection method is simple and the structure is stable.

This embodiment discloses a dry electrode for non-invasive brain-computer interface equipment. Compared with the existing technology, the adaptive capability of the electrode assembly of the EEG equipment is greatly improved. The electrode head 20 and the electrode base 10 are integrally formed. The connection uses the elasticity of its own material to ensure that the electrode head always fits tightly with the scalp at the designated acupuncture point during the process of detecting EEG signals. It has strong adaptability and can also avoid electrode slippage caused by the size of the head. EEG signals are more precise.

Above, the technical solution of the present utility model is introduced in detail with reference to specific embodiments. The described specific embodiments are used to help understand the idea of the present utility model. The derivation and modifications made by those skilled in the art based on the specific embodiments of the present invention also fall within the protection scope of the present invention.

Claims (5)

1. A dry electrode for a non-invasive brain-computer interface device, comprising a conductive base (10) and an electrode tip (20);

a conductive connecting part (103) is arranged on one end face of the conductive base (10), the conductive connecting part (103) is used for being connected with brain-computer interface equipment, and at least one electrode head (20) is arranged on the other end face of the conductive base (10);

the electrode head (20) comprises an electrode body (201) made of elastic materials and a first conductive layer (202) covered on the surface of the electrode body (201);

the three electrode heads (20) are distributed on the conductive base (10) in a regular triangle, the electrode heads (20) are T-shaped, vertical sections of the electrode heads (20) are connected with the conductive base (10), and transverse sections of the electrode heads (20) are of a circular arch structure and are used for abutting against the head of a human body.

2. A dry electrode for a non-invasive brain-computer interface device according to claim 1, characterized in that the first conductive layer (202) is a silver chloride layer.

3. A dry electrode for a non-invasive brain-computer interface device according to claim 1, characterized in that the electrode body (201) is made of medical rubber.

4. A dry electrode for a non-invasive brain-computer interface device according to claim 1, characterized in that the conductive base (10) comprises a base body (101) of medical rubber material and a second conductive layer (102) covering the surface of the base body (101).

5. A dry electrode for a non-invasive brain-computer interface device according to claim 4, characterized in that the conductive connection (103) is a threaded or plug-in post structure.