Dry electrode system for detecting electroencephalogram

Abstract

The invention provides a dry electrode system for detecting electroencephalogram. The system comprises a signal acquisition module, a pre-amplification module and a power module. The signal acquisition module is used for acquiring and outputting original electroencephalogram. The pre-amplification module is used for amplifying the original electroencephalogram and outputting the amplified electroencephalogram. The power module is used for supplying power to the pre-amplification module and outputting the amplified electroencephalogram to the exterior. The problems that contact resistance of an electroencephalogram dry electrode is large, and interference by the environment is likely to happen are solved, the electroencephalogram can be conveniently, efficiently and accurately detected, and wide application prospects are achieved on neurological disease diagnosis and treatment, brain-machine interfaces and limb rehabilitation.

Description

technical field [0001] The invention belongs to the field of integrated circuits, in particular to a dry electrode system for detecting electroencephalogram signals. Background technique [0002] At present, clinically, EEG (electroencephalogram signal) has been used in the diagnosis and treatment of neurological diseases such as epilepsy, traumatic brain injury, cerebrovascular disease, intracranial inflammation and sleep disorders. in auxiliary diagnosis and treatment. With the in-depth development of medical neuroscience, cognitive psychology and artificial intelligence research, EEG detection and analysis are being increasingly applied to functional rehabilitation, neurobiological research and brain science research. EEG detection has a long history, but it is still a thorny problem due to the particularity of the EEG signal itself, the measured object, and the measurement environment. First, the amplitude of the EEG signal is very small, but the output impedance is ve...

AI Technical Summary

Problems solved by technology

First, the amplitude of the EEG signal is very small, but the output impedance is very high, and contains low-frequency components close to direct current; second, the signal-to-noise ratio of the EEG signal is low, and it is easily affected by power frequency signals, EMG signals and environmental noise; Third, the EEG detection must consider the physiological nature of the subject and ensure the safety of the operation, etc.

At present, wet electrodes are usually used for EEG acquisition. Before the EEG acquisition, the subjects must apply a conductive medium to reduce the ultra-high impedance of the stratum corneum, so that the amplifier can work normally, but this process needs to be carried out with the assistance of outsiders. cost longer

In addition, traditional EEG acquisition systems generally use wired EEG amplification equipment, which is restricted by the environment, and generally can only be used for EEG acquisition on specific occasions

For patients who need EEG testing, it is necessary to go to the EEG testing department of the hospital for special testing. At the same time, due to the aperiodicity of EEG signals, pathological signals in EEG appear randomly. Therefore, in order to obtain accurate diagnostic results, a longer period of EEG is required. This has caused economic burden and time loss to patients, and the long process of seeing a doctor has also brought a huge load to the outpatient department of the hospital.

At present, conventional EEG stem electrodes have high contact resistance and are susceptible to environmental interference.

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