Brevet : EP0830094 - APPAREIL REGULATEUR DE LA PUISSANCE DE SORTIE D'UN GENERATEUR ELECTROCHIRURGICA...

Titre

APPAREIL REGULATEUR DE LA PUISSANCE DE SORTIE D'UN GENERATEUR ELECTROCHIRURGICAL

N° et date de publication de la demande

EP0830094 - 25/03/1998

Type de la demande

A1

N° et date de dépôt

EP96915136.4 - 03/06/1996

N° et date de priorité

US46895095 - 06/06/1995

Famille de brevets

ATE196233T1 ; US5599344A ; JPH10509368A ; MX9709020A ; WO9639089A1 ; CA2220921A1 ; DE69610309T2 ; ES2150125T3 ; EP0830094A1 ; AU5701096A

Abrégé

A power control apparatus for an electrosurgical generator is used for controlling output power from the generator to the tissue or bodily fluids of a patient. The control apparatus rapidly determines the range of impedance of the load on the electrosurgical generator and adjusts the output power accordingly. Output current and output voltage from the electrosurgical generator are monitored and sent to a microprocessor. The microprocessor runs an algorithm that determines the impedance range of the load on the generator. The algorithm uses computational techniques, such as comparisons and bit shifting, that avoid long division and other time-consuming operations. The microprocessor can then adjust a high voltage power supply that effects the radio frequency amplifier stage. A method for controlling the power of the electrosurgical generator, including steps in the algorithm, is also disclosed.