Patents by Inventor Jack C. Cordis

Jack C. Cordis 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).

  • Electrosurgical apparatus employing constant voltage and methods of use
    Patent number: 5472443
    Abstract: Methods and apparatus are provided for use in performing electrosurgery, wherein a power supply supplies an electrosurgical instrument with a low voltage power signal having a substantially constant peak-to-peak voltage that is independent of the load impedance and which has a crest factor near unity. A power supply is provided to supply a voltage waveform in accordance with the methods of the invention. A clipping circuit is also provided to permit practice of the methods using conventional electrosurgcial generators and previously known electrosurgical instruments, wherein the voltage amplitude and waveform is modified to the desired regime.
    Type: Grant
    Filed: March 17, 1994
    Date of Patent: December 5, 1995
    Assignee: Hemostatic Surgery Corporation
    Inventors: Jack C. Cordis, Dennis J. Denen, Philip E. Eggers, John J. Knittle, Raymond C. Ramsey, Robert F. Shaw