Electroencephalo-graph dry electrode based on capacitive coupling principle

Abstract

The invention discloses an electroencephalo-graph dry electrode based on a capacitive coupling principle, belonging to the technical field of biomedicine and used for measurement of human body potential. The dry electrode comprises a metal shielding case, a PCB (Printed Circuit Board) and a capacitive electrode, wherein the capacitive electrode contains a metal sheet for connecting the electrode and the PCB together. The over-all structure of the capacitive electrode is fixed in a cap, a contact of the capacitive electrode is inserted into hairs so as to avoid the hairs from disturbing signals in a measuring process, and the capacitive electrode fixed in the cap can be properly adjusted so as to obtain signals with higher quality. According to the invention, a brain electrode structure for electroencephalo-graph signal acquisition can acquire electroencephalo-graph signals very well based on the existing processing technology and mechanical structure; in comparison with the conventional wet electrode, the electroencephalo-graph dry electrode can be used for detecting electroencephalo-graph signals for a long term without executing a skin preparation step and cannot be influenced by movement of a measurement subject, and the electroencephalo-graph dry electrode has small and exquisite structure, can be used conveniently and quickly and can reduce external noise and finish high-quality record of microvolt electroencephalo-graph signals.

Description

technical field [0001] The invention relates to a brain electric stem electrode based on the capacitive coupling principle in the field of biomedicine, in particular to a brain electrode composed of a capacitive electrode made using the capacitance principle and an ingeniously designed mechanical structure. Background technique [0002] At present, there are three main types of brain electrodes: wet electrodes, dry electrodes, and capacitive electrodes. [0003] Traditional brain electrode technology, that is, wet electrodes, needs to provide very low contact impedance when collecting EEG signals. Under this requirement, conductive paste is needed to achieve it. Such preparatory work before collecting EEG signals will take a long time, and the more acquisition channels, the longer the time spent. Moreover, the conductive paste will dry out within a certain period of time, which is a bottleneck for a system that monitors the human body for a long time. At the same time, the...

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Problems solved by technology

[0007] The object of the present invention is to address the deficiencies and defects of the prior art, and propose a kind of EEG dry electrode based on capacitive coupling principle that is simple to make and reduces noise interference. To solve the problem of hair when using capacitive electrodes to collect EEG

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