Joshua D Keller

US Patent:

20120283731, Nov 8, 2012

Filed:

May 30, 2012

Appl. No.:

13/483815

Inventors:

Jeffrey R. Unger - Longmont CO, US
Ryan C. Artale - Boulder CO, US
Joshua A. Keller - Lafayette CO, US
Gregory P. Milner - Fort Collins CO, US
Kenneth C. Brockmann - Boulder CO, US
Alexander M. Waskiewicz - Boulder CO, US
Rebecca J. Coulson - Lyons CO, US
Jessica E. C. Olson - Frederick CO, US

Assignee:

TYCO HEALTHCARE GROUP LP - Mansfield MA

International Classification:

A61B 18/18

US Classification:

606 49

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.

US Patent:

20160045248, Feb 18, 2016

Filed:

Oct 27, 2015

Appl. No.:

14/924377

Inventors:

- Mansfield MA, US
RYAN C. ARTALE - BOULDER CO, US
JOSHUA A. KELLER - LAFAYETTE CO, US
GREGORY P. MILNER - FORT COLLINS CO, US
KENNETH C. BROCKMANN - BOULDER CO, US
ALEXANDER M. WASKIEWICZ - LAFAYETTE CO, US
REBECCA J. COULSON - LYONS CO, US
JESSICA E.C. OLSON - FREDERICK CO, US

International Classification:

A61B 18/12

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 whether a tissue reaction has occurred 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 level of the electrosurgical generator to substantially match tissue impedance to a corresponding target impedance value for at least a predetermined minimum time period.