engleski

Electrode characteristics at high current pulse stimulation

In contrast to peripheral nerves or open cortex stimulation where brief and weak stimuli are successful, the activation of the brain motor area during general anaesthesia in cases with the intact patient’s head, very strong electrical stimulation pulses are needed. It is mostly because of the high scull and scalp impedance and therefore only about 10% of total stimulating current pass this barrier and effectively activate the neurones. In order to enable selective neural stimulation, small area electrodes are used. In this paper, the influence of pulse current stimuli parameters on the characteristics of cup EEG and corc screw at high current densities are investigated. The cup electrodes, in contrast to the corc screw electrodes, showed nonlinear properties, i.e. a significant increase in pulse voltage to current ratio at high current densities.

Transcranial Electrical Stimulation; Electrode – skin Interface; Bioimpedance

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