Patents by Inventor Russ E. Anderson

Russ E. Anderson 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).

  • RF ablation apparatus and method having electrode/tissue contact assessment scheme and electrocardiogram filtering
    Patent number: 6391024
    Abstract: A method of assessing the adequacy of contact between an ablation electrode and biological tissue within a biological organ having biological fluid therein includes the steps of positioning the ablation electrode proximal the biological tissue; positioning a reference electrode a distance from the ablation electrode; measuring the impedance between the ablation electrode and the reference electrode at a first frequency and measuring the impedance between the ablation electrode and the reference electrode at a second frequency. The percentage difference between the first-frequency impedance and the second-frequency impedance provides an indication of the state of electrode/tissue contact. In general, a percentage difference of at least approximately 10% serves as an indication of substantially complete electrode/tissue contact. A percentage difference in the approximate range between 5% and 10% serves as an indication of partial electrode/tissue contact.
    Type: Grant
    Filed: June 17, 1999
    Date of Patent: May 21, 2002
    Assignee: Cardiac Pacemakers, Inc.
    Inventors: Weimin Sun, Thomas M. Castellano, Russ E. Anderson, Wade A. Bowe, John A. Simpson, Marshall L. Sherman, Kathryn E. Lockwood