Patents by Inventor William A. Missfeldt

William A. Missfeldt 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).

  • Pneumatic drive circuit for an artificial ventricle including systolic pressure control
    Patent number: 4808088
    Abstract: A pneumatic drive circuit for a pneumatically-driven artificial ventricle having a gas chamber and a blood chamber separated by a flexible diaphragm. The drive circuit comprises a source of pressurized gas at a preselected pressure. Valves operatively associated with the gas chamber of the ventricle admit gas to the gas chamber during systole and exhaust gas from the gas chamber during diastole. The drive circuit includes pneumatic logic circuitry for actuating the valves. The logic circuitry includes circuitry for causing the valves to admit gas to the gas chamber during systole at a pressure which increases gradually from zero pressure to a pressure less than the preselected pressure, and then increases rapidly to the preselected pressure.
    Type: Grant
    Filed: September 25, 1986
    Date of Patent: February 28, 1989
    Assignee: Temple University of the Commonwealth System of Higher Education
    Inventor: William A. Missfeldt