Portable multi-lead electroencephalogram acquisition system based on capacitive coupling electrode

Abstract

The invention discloses a portable multi-lead electroencephalogram acquisition system based on a capacitive coupling electrode, which utilizes a signal buffer circuit connected with a capacitive coupling PCB electrode, the capacitive coupling PCB electrode is not in direct contact with the scalp, a gap capacitive coupling electroencephalogram signal is formed between the capacitive coupling PCB electrode and the scalp, the assistance of a conductive adhesive is not needed, the operation is simple, the use is convenient, common-mode interference signals are obtained through the signal amplification filter circuit according to received signals, the common-mode interference signals are superposed, amplified through the reverse-phase amplification circuit and then fed back to the human body, the influence of common-mode interference on the surface of the human body on collection is counteracted, a collection mode based on a capacitance coupling electrode is adopted, long-term collection of electroencephalogram signals can be achieved, a signal amplification filter circuit and an A / D conversion circuit structure adopting a time-sharing conversion system are greatly simplified, the size and the weight of a signal processing circuit are greatly reduced, and carrying is easy; the wireless transmission module is adopted, the distance constraint of a wire is eliminated, the application scene of electroencephalogram collection is expanded, and the electroencephalogram collection efficiency is improved.

Description

technical field [0001] The invention belongs to an EEG acquisition system, in particular to a portable multi-lead EEG acquisition system based on capacitive coupling electrodes. Background technique [0002] In recent years, the field of brain function research has attracted more and more attention. Countries around the world have increased investment and launched corresponding brain science research programs. In human brain research, electroencephalography (EEG) is the most widely used non-invasive physiological monitoring method. EEG can reflect the electrophysiological activity information of the cerebral cortex, and can be used in the clinical diagnosis of epilepsy, depression, Parkinson, brain tumors and other mental diseases. In addition, EEG has also been applied to many emerging fields such as neurofeedback training, brain function research, and the brain-computer interface that has attracted much attention. At present, the EEG acquisition equipment used by major me...

AI Technical Summary

Problems solved by technology

The operation process of these two types of electrodes is cumbersome and the wearing comfort is poor. During the long-term acquisition of EEG signals, the solidification of conductive gel, electrode shedding, and changes in the physical properties of the skin surface will affect the accuracy of the final acquisition results.

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