Patents by Inventor Joshua A. Keller

Joshua A. Keller 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).

  • SYSTEM AND METHOD FOR TISSUE SEALING
    Publication number: 20160045248
    Abstract: An electrosurgical generator is disclosed. The generator includes an RF output stage configured to supply electrosurgical energy to tissue via at least one active electrode configured to apply electrosurgical energy to tissue; sensing circuitry configured to measure impedance of tissue; and a controller.
    Type: Application
    Filed: October 27, 2015
    Publication date: February 18, 2016
    Inventors: JEFFREY R. UNGER, RYAN C. ARTALE, JOSHUA A. KELLER, GREGORY P. MILNER, KENNETH C. BROCKMANN, ALEXANDER M. WASKIEWICZ, REBECCA J. COULSON, JESSICA E.C. OLSON
  • System and method for tissue sealing
    Patent number: 9186200
    Abstract: An electrosurgical generator is disclosed. The generator includes an RF output stage configured to supply electrosurgical energy to tissue via at least one active electrode configured to apply electrosurgical energy to tissue; sensing circuitry configured to measure impedance of tissue; and a controller. The controller is configured to determine occurrence of a tissue reaction as a function of a minimum impedance value and a predetermined rise in impedance, wherein tissue reaction corresponds to a boiling point of tissue fluid; generate a target impedance trajectory as a function of measured impedance and desired rate of change based on the tissue reaction determination, wherein the target impedance trajectory includes a plurality of target impedance values; and drive tissue impedance along the target impedance trajectory by adjusting the output of the electrosurgical generator to substantially match tissue impedance to a corresponding target impedance for at least a predetermined minimum time period.
    Type: Grant
    Filed: May 30, 2012
    Date of Patent: November 17, 2015
    Assignee: Covidien AG
    Inventors: Jeffrey R. Unger, Ryan C. Artale, Joshua A. Keller, Gregory P. Milner, Kenneth C. Brockmann, Alexander M. Waskiewicz, Rebecca J. Coulson, Jessica E. C. Olson
  • System and Method for Tissue Sealing
    Publication number: 20120283731
    Abstract: An electrosurgical generator is disclosed. The generator includes an RF output stage configured to supply electrosurgical energy to tissue via at least one active electrode configured to apply electrosurgical energy to tissue; sensing circuitry configured to measure impedance of tissue; and a controller. The controller is configured to determine occurrence of a tissue reaction as a function of a minimum impedance value and a predetermined rise in impedance, wherein tissue reaction corresponds to a boiling point of tissue fluid; generate a target impedance trajectory as a function of measured impedance and desired rate of change based on the tissue reaction determination, wherein the target impedance trajectory includes a plurality of target impedance values; and drive tissue impedance along the target impedance trajectory by adjusting the output of the electrosurgical generator to substantially match tissue impedance to a corresponding target impedance for at least a predetermined minimum time period.
    Type: Application
    Filed: May 30, 2012
    Publication date: November 8, 2012
    Applicant: TYCO HEALTHCARE GROUP LP
    Inventors: Jeffrey R. Unger, Ryan C. Artale, Joshua A. Keller, Gregory P. Milner, Kenneth C. Brockmann, Alexander M. Waskiewicz, Rebecca J. Coulson, Jessica E. C. Olson