Method and apparatus for transcutaneous electrical stimulation
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United States of America Patent
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Mar 12, 1985
Issued Date -
N/A
app pub date -
Sep 15, 1981
filing date -
Jun 29, 1979
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method and apparatus for monitoring and obtaining actual bio-electrical characteristics of a subject under predetermined conditions of evoked response stimuli, and by interaction with a computer, applying cutaneous electrical stimulation to the subject, using a signal generator to modify current amplitude and frequency in a direction to achieve bio-electrical characteristics in the subject related to the actual bio-electrical characteristics monitored. The signal generator uses a sinusoidal waveform output, with battery power passed through a transformer to power a transconductance amplifier to obtain constant current output despite resistance changes in the line with the subject, and with the transformer not placed in the signal path of the sinusoidal waveform. The signal may be obtained from a sinusoidal oscillator of wide frequency having switched integrator sections connected to an inverting amplifier, pulse generator and gating.
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