41
James H Orszulak, James W McPherson: Switched resonant ultrasonic power amplifier system. Covidien, September 19, 2017: US09768373

A switched resonant power amplifier system for ultrasonic transducers is disclosed. The system includes an amplifier that receives and processes a driver output signal for generating a drive signal that is provided to an ultrasonic device for controlling output of the ultrasonic device. An output co ...


42
James H Orszulak, J Bruce Dunne: Surgical forceps including thermal spread control. COVIDIEN, September 13, 2016: US09439717

A surgical instrument includes one or more electrically-conductive plates adapted to connect to a source of energy for supplying energy to tissue to treat tissue, a temperature sensing element, and a thermal spread control assembly coupled to the temperature sensing element. The thermal spread contr ...


43
James H Orszulak: Electrosurgical apparatus with high speed energy recovery. Covidien, November 17, 2015: US09186201

A circuit for controlling the discharging of stored energy in an electrosurgical generator includes a pulse modulator which controls an output of a power supply. At least one comparator is configured to provide an error signal to the pulse modulator based on a comparison between an output signal gen ...


44
James H Orszulak: Electrosurgical apparatus with predictive RF source control. Covidien, December 17, 2013: US08608733

An electrosurgical generator is disclosed, which includes a closed loop control system having a sensor system configured to sense tissue and/or energy properties at a tissue site and to generate a sensor signal representative of the tissue and/or energy properties. The control system includes a cont ...


45
James H Orszulak: Electrosurgical apparatus with real-time RF tissue energy control. Covidien, May 12, 2015: US09028479

A radio-frequency (RF) amplifier having a direct response to an arbitrary signal source to output one or more electrosurgical waveforms within an energy activation request, is disclosed. The RF amplifier includes a phase compensator coupled to an RF arbitrary source, the phase compensator configured ...


46
James H Orszulak: Electrosurgical apparatus with tissue site sensing and feedback control. Covidien, June 9, 2015: US09050089

An electrosurgical system and method for transmitting, monitoring, and controlling electrosurgical energy and tissue parameter quality at the tissue site. The electrosurgical system includes a generator adapted to generate electrosurgical energy for treating tissue. The generator includes one or mor ...


47
James H Orszulak: Electrosurgical apparatus with high speed energy recovery. Covidien, March 3, 2015: US08968295

A circuit for controlling the discharging of stored energy in an electrosurgical generator includes a pulse modulator which controls an output of a power supply. At least one comparator is configured to provide an error signal to the pulse modulator based on a comparison between an output signal gen ...


48
James H Orszulak, Steven E McGraw: System and method for electrosurgical generator power management. COVIDIEN, August 22, 2017: US09739814

A system and method that improves and automates the measurement of power generated by an electrosurgical generator. An active load device is coupled to the generator output and is configured to simulate the change in tissue characteristics, such as an impedance change, that occurs when such tissue u ...


49
James H Orszulak: Electrosurgical radio frequency energy transmission medium. COVIDIEN, June 28, 2016: US09375244

An electrosurgical system includes a generator that generates electrosurgical energy for treating tissue. The generator includes one or more active output terminals which supply energy to tissue and are operatively connected to one or more supply lines. The generator also includes one or more return ...


50
Robert Wham, Steven P Buysse, James H Orszulak: Vessel sealing system. United States Surgical, a Division of Tyco Healthcare, August 26, 2004: US20040167508-A1

A method for electrosurgically sealing a tissue includes steps of: (A) applying a first pulse of RF energy to the tissue; and (B) applying at least one subsequent RF energy pulse to the tissue and varying RF energy parameters of individual pulses of subsequent RF energy pulses in accordance with at ...