Surgery – Truss – Pad
Patent
1989-05-22
1990-12-18
Jaworski, Francis
Surgery
Truss
Pad
128419R, A61N 100
Patent
active
049778951
ABSTRACT:
An electrical neuro-stimulator which operates using pulse generators for providing a master frequency, a carrier frequency, a first modulation frequency and a second modulation frequency. The pulse width and pulse rate are adjustable, and a pair of multivibrators produces a pulse train output with an adjustable number of impulses by adjustment of the carrier frequency, which also increases the average applied power and the penetration factor. The master and carrier oscillators of the pulse generator operate asynchronously, and a digital mixer is provided for combination of these frequencies with a slightly random appearance, thus avoiding accommodation or adaptation while maintaining a constant energy at any frequency. The first modulation frequency provides a triangular form of amplitude modulation of the pulse train waveform envelope. A 180 degree shift in this waveform is provided by a time lag introduced on the second channel, such that accommodation of the nerves is avoided. By combination of high and low-pass filters, the envelope of the pulse train waveform is given an increasing amplitude from its initial value during a predetermined interval. This avoids shock sensation on the skin when the pulses are first applied, since the initial tissue impedance is higher and the voltage applied must necessarily be higher to maintain constant current. A set of specially-designed pulse transformers is provided to maintain the optimal pulse waveform shape when the tissue impedance changes, providing compensation via a reactive componment.
REFERENCES:
patent: 4711243 (1987-12-01), Schafer
patent: 4769881 (1988-09-01), Pedigo et al.
patent: 4841972 (1989-06-01), Masaki
patent: 4844075 (1989-07-01), Liss et al.
Jaworski Francis
Langer Edward
Manuel Goerge
Pasternak Ely Shavit
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