Ultraminiature stimulus-isolation probe
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چکیده
The first two problems depend on the size and shape of the stimulus electrodes and the accessibility of the fibres to be stimulated, which determines the necessary current density of the stimulus current. The prevention of undesirable electrochemical electrode reactions can easily be controlled by measuring the stimulus-electrode potential during current flow (BERGVELD, 1976). The third problem, the prevention of a stimulus artefact, will be described in this paper. It appears that by using an optically coupled ultraminiature stimulation circuit built as a probe containing the actual stimulus electrodes, and also using a suitable configuration of the measuring electrodes, the stimulus artefact can be cancelled out completely.
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