Patent ID: 7892223

Claim:
A surgical instrument comprising: a gas-delivery device to supply an inert gas to a tissue-treatment region; a rinsing device for rinsing a target region with a stream of a rinsing liquid placed under a rinsing pressure by the inert gas supplied by the gas-delivery device, the rinsing device comprising an external pressure container inside of which is an inner container with an elastic wall that contains the rinsing liquid; and wherein the gas-delivery device and the external pressure container are connected via a conduit such that the external pressure container receives gas from the gas-delivery device, said gas acting upon said elastic wall of the inner container to pressurize a liquid in said inner container, and wherein the gas-delivery device comprises a first control for regulating at least one of a pressure and a volume flow of the inert gas, the first control being controlled in such a way that at least one of the pressure and the volume flow of the inert gas is switched between at least one first value for supplying the inert gas to the tissue-treatment region and a second value for producing the rinsing pressure.