Medical stimulator with stimulation signal characteristics modulated as a function of stimulation signal frequency
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United States of America Patent
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May 8, 1990
Issued Date -
N/A
app pub date -
Feb 8, 1989
filing date -
Jul 22, 1985
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A transcutaneous electrical nerve stimulation (TENS) apparatus includes first, second, and third oscillators. The first oscillator produces a first train of pulses at a main frequency. The second oscillator produces a second train of pulses at a modulation frequency. Output levels of the second train of pulses vary as a function of the modulation frequency. A frequency control simultaneously controls both the main and modulation frequencies. The third oscillator is responsive to the first and second oscillators and produces a third train of pulses at the main frequency. Intensity and frequency of the pulses of the third pulse train are modulated as a function of the output levels of the second train of pulses. An output driver responsive to the third oscillator converts the third train of pulses into a train of stimulation pulses having electrical characteristics adapted to be applied to a human body to suppress pain.
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