David A Swift

US Patent:

44535481, Jun 12, 1984

Filed:

May 2, 1983

Appl. No.:

6/490361

Inventors:

Donald D. Maurer - Anoka MN
David E. Swift - Bethel MN
Zosim Ioffe - St. Paul MN

Assignee:

Empi, Inc. - Fridley MN

International Classification:

A61N 132

US Classification:

128421

Abstract:

A transcutaneous electrical nerve stimulation apparatus having stimulus electrical pulses modulated in time and intensity to stimulate afferent nerves and cause the release of endogenous opiates which suppress pain. An astable pulse generator provides a first train of pulses at a selected repetition rate. A monostable pulse generator connected to receive the first train of pulses supplies a second pulse train having the frequency of the first train. The width of the pulses of the first train is varied over a predetermined range. A second monostable pulse generator connected to pulse amplifiers receives the first and second train of pulses and provides a supply pulse to the patient. Adjustable pulse modulators connected to the second pulse generators function to simultaneously increase the repetition rate of the first train of pulses and decrease the second train of pulses.

US Patent:

44428391, Apr 17, 1984

Filed:

Apr 27, 1981

Appl. No.:

6/257737

Inventors:

Donald D. Maurer - Anoka MN
David E. Swift - Anoka MN
Zosim Ioffe - St. Paul MN

Assignee:

EMPI, Inc. - Fridley MN

International Classification:

A61N 136

US Classification:

128419R

Abstract:

A transcutaneous electrical nerve stimulation apparatus having stimulus electrical pulses modulated in time and intensity to stimulate afferent nerves and cause the release of endogenous opiates which suppress pain. An astable pulse generator provides a first train of pulses at a selected repetition rate. A monostable pulse generator connected to receive the first train of pulses supplies a second pulse train having the frequency of the first train. The width of the pulses of the first train is varied over a predetermined range. A second monostable pulse generator connected to pulse amplifiers receives the first and second train of pulses and provides a supply pulse to the patient. Adjustable pulse modulators connected to the second pulse generators function to simultaneously increase the repetition rate of the first train of pulses and decrease the second train of pulses.

US Patent:

44310021, Feb 14, 1984

Filed:

Jun 8, 1981

Appl. No.:

6/271258

Inventors:

Donald D. Maurer - Anoka MN
David E. Swift - Anoka MN
Zosim Ioffe - St. Paul MN

Assignee:

EMPI Inc. - Fridley MN

International Classification:

A61N 136

US Classification:

128422

Abstract:

A transcutaneous electrical nerve stimulation apparatus having stimulus electrical pulses modulated in time and intensity to stimulate afferent and efferent nerves and cause the release of endogenous opiates which suppress pain. An astable pulse generator provides a first train of pulses at a selected repetition rate. A monostable pulse generator connected to receive the first train of pulses supplies a second pulse train having the frequency of the first train. The width of the pulses of the first train is varied over a predetermined range. A second monostable pulse generator connected to pulse amplifiers receives the first and second train of pulses and provides a supply pulse to the patient. Adjustable pulse modulators connected to the second pulse generators function to simultaneously increase the repetition rate of the first train of pulses and decrease the amplitude and pulse width of the second train of pulses, the change being between two predetermined levels for all three parameters with the magnitude of change, i. e. the percent of modulation being determined by the setting of the patient rate, and pulse width control.