Brain impedance detection circuitry and EEG checking device

Abstract

The invention discloses a brain electrical impedance detection circuit, comprising a drive unit and a detecting unit. The drive unit is composed of a constant electrical source and a grounded resistor; the electricity of the constant electrical source runs through the leads and the grounded resistor, forming an electric loop; the detecting unit comprises a band-pass filter circuit, a multi-way switch, a first amplifying circuit, a demodulation circuit and a controller; wherein the band-pass filter circuit filters the brain electrical signals, the controller controls the multi-way switch to switch the brain electrical signals outputted by the filter circuit to the first amplifying circuit in turn according to set time order; the filtered brain electrical signals are outputted to the demodulation circuit after being processed by the first amplifying circuit and the demodulation circuit outputs brain electrical impedance value after demodulation. The invention can detect the contact resistances of a plurality of electrodes while conducting brain electrical detection. The invention provides forceful and timely basis for wiping off electrocortical potential distance according to connection state of the leads and the scalp in the detection.

Description

【Technical field】 [0001] The invention relates to an EEG detection device capable of detecting EEG signals in the medical field, in particular to an EEG impedance detection circuit in the EEG detection device. 【Background technique】 [0002] Human tissue cells are always producing very weak bioelectrical activities spontaneously and continuously. The EEG signal is the overall effect of the electrical activity of a large number of brain nerve cells in a highly coherent state on the cerebral cortex. The electrical activity of the brain cells is drawn out by electrodes placed on the scalp and amplified by the EEG detection equipment. On the special paper, the graphics and curves with certain waveform, amplitude, frequency and phase can be obtained, which is the electroencephalogram. When pathological or functional changes occur in brain tissue, this curve will change accordingly, thus providing a basis for clinical diagnosis and treatment. [0003] Since the EEG signal itself...

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Problems solved by technology

[0004] The main purpose of the present invention is to solve the problem that the impedance between the electrodes and the scalp cannot be measured in real time during EEG detection in the prior art, and proposes an EEG impedance detection circui

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