Electrosurgical generator

US6923804B2 · kind B2 · utility

Assignee

• Neothermia Corporation · US

Inventors

• Philip E. Eggers · Dublin, US
• John Kociecki · Powell, US
• Mark Mayerchak · Bothell, US

Key dates

• Filing date: Aug 1, 2003
• Grant date: Aug 2, 2005
• Expiry date: Nov 18, 2023

Classification

• Technology area (CPC A): Human Necessities
• CPC primary: A61B2218/008
• WIPO field: Medical technology
• WIPO sector: Instruments

Abstract

An electrosurgical generator which provides a constant power output particularly suited for cutting arc formation at an active electrode which exhibits a dynamic active surface area of varying geometry. Essentially constant power-based control is achieved through the utilization of a d.c. link voltage the level of which functions to establish the amplitude of the output of an RF resonant inverter. A dual loop feedback control is described wherein output power based control signals are slowly introduced at low gain, while link voltage based controls are comparatively rapidly applied. Enhanced development of a controlling d.c. link voltage is achieved through the utilization of an input network incorporating a power factor correction stage.