Patent ID: 7815634

Claim:
An electrosurgical apparatus to provide controlled delivery of radio-frequency power and a fluid to an electrosurgical hand device to treat tissue, the apparatus comprising: a radio-frequency generator to deliver the radio-frequency power, the radio-frequency power from the radio-frequency generator selectable at a radio-frequency power level; a pump to deliver the fluid; a primer to prime the hand device with the fluid; a control system comprising an open loop control system with respect to the tissue, the open loop control system having a functional relationship relating a flow of the fluid to be delivered by the pump to the radio-frequency power level, the functional relationship to increase the flow of the fluid in response to an increase in the radio-frequency power level and to decrease the flow of the fluid in response to a decrease in the radio-frequency power level; a selection switch which changes the functional relationship relating the flow of the fluid to be delivered by the pump to the radio-frequency power level; and wherein the functional relationship relating a flow of the fluid to be delivered by the pump to the radio-frequency power level resides in a storage medium of the apparatus for use by a microprocessor, the functional relationship in the form of a mathematical equation having a proportionality constant and the selection switch changes the functional relationship by changing the proportionality constant.