Medical stimulator with stimulation signal characteristics modulated as a function of stimulation signal frequency
US4922908A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 8, 1989 |
| Grant date | May 8, 1990 |
| Priority date | — |
| Expiry date | Feb 8, 2009 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61N1/36021
- WIPO fieldMedical technology
- WIPO sectorInstruments
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.