Patents by Inventor David E. Swift

David E. Swift has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Method of improving sensory tolerance with modulated nerve stimulator
    Patent number: 4453548
    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.
    Type: Grant
    Filed: May 2, 1983
    Date of Patent: June 12, 1984
    Assignee: Empi, Inc.
    Inventors: Donald D. Maurer, David E. Swift, Zosim Ioffe
  • Method of modulating energy in train of electrical pulses
    Patent number: 4442839
    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.
    Type: Grant
    Filed: April 27, 1981
    Date of Patent: April 17, 1984
    Assignee: EMPI, Inc.
    Inventors: Donald D. Maurer, David E. Swift, Zosim Ioffe
  • Modulated deep afferent stimulator
    Patent number: 4431002
    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.
    Type: Grant
    Filed: June 8, 1981
    Date of Patent: February 14, 1984
    Assignee: EMPI Inc.
    Inventors: Donald D. Maurer, David E. Swift, Zosim Ioffe