Composite material optical electrode integrated with electroencephalogram signal detection chip and preparation method of composite material optical electrode

By combining the microneedle structure of composite optical electrodes with viscous hydrogel, the problems of unstable electrode-scalp connection and low signal-to-noise ratio were solved, enabling long-term, high-quality EEG signal transmission and acquisition.

CN120899262APending Publication Date: 2025-11-07WENZHOU BOHONG OPTICAL INSTRUMENT TECHNOLOGY CO LTD
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Patent Information

Application Number
CN202511001550.X
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-07-21
Publication Date
2025-11-07

AI Technical Summary

Technical Problem

Existing EEG signal detection electrodes cannot achieve long-term, high-quality signal transmission. The connection between the electrodes and the scalp is unstable, the signal-to-noise ratio is low, and they are easily affected by external interference. They also cannot simultaneously release conductive fluid at the electrode-skin interface and penetrate the stratum corneum.

Method used

Using composite material optical electrodes, the fine microneedles penetrate the scalp stratum corneum to form a stable connection with the scalp. The surface of the microneedles is coated with an AgNWs conductive layer to improve conductivity, and combined with a viscous hydrogel material to achieve stable contact. It includes a flexible substrate, a melamine sponge layer and an optical EEG detection chip, achieving conformal contact and long-term wetting between the electrodes and the skin.

Benefits of technology

This increases the contact area between the electrodes and the scalp, reduces contact impedance, enhances conductivity, improves the signal-to-noise ratio, and enables long-term, high-quality EEG signal transmission and acquisition.

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Abstract

The invention discloses a composite material optical electrode integrated with an electroencephalogram detection chip. The composite material optical electrode comprises an optical electroencephalogram detection chip and a melamine sponge layer which are respectively fixed on the upper surface and the lower surface of a flexible substrate, the bottom surface of the flexible substrate is provided with a conical microneedle array which is centrally arranged, the length of each microneedle is 0.5 mm, the root diameter of each microneedle is 0.25 mm, the bottom surface of the flexible substrate and the surfaces of the microneedles are provided with silver nano-plating layers, wires which are connected to a first contact on the flexible substrate are embedded in the silver nano-plating layers, and the first contact is connected to a chip electrode contact through the wires; the thickness of the melamine sponge layer attached to the silver nanometer plating layer face is 0.3 mm, the melamine sponge layer contains polyvinyl alcohol hydrogel, the tip end of the microneedle penetrates through the melamine sponge layer and protrudes out of the surface of the melamine sponge layer, and therefore an electrolyte contact interface is formed. The EEG signal transmission performance is improved through the integrated design of conductive liquid release and flexible microneedle penetration through the cuticle. The flexible optical electrode adopts a composite material to enhance conductivity and flexibility, reduce impedance and improve the signal-to-noise ratio.
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Citation Information

Patent Citations

  • Novel passive flexible optical electrode

    CN109124626A

  • Multi-channel electroencephalogram detection optical chip structure based on optical principle and sensor thereof

    CN117243611A

  • High-strength graphene oxide nano-composite hydrogel brain electrode and application thereof

    CN117645733A