Patent ID: 8679143

Claim:
An appliance for water jet surgery, comprising: a working instrument having a nozzle; a plurality of single-use supply cylinders, each supply cylinder including a side wall, a piston, a working fluid, and an outlet, wherein the working fluid is enclosed within each supply cylinder in a leak proof manner until it is caused to be expelled, by means of the piston, through the outlet; wherein each piston comprises a back-flow barrier such that, after the piston has reached a position in which the working fluid has been expelled from its associated supply cylinder, the piston cannot be pushed back into a previous position, and/or an irreversibly openable transport gasket is provided at the outlet of each supply cylinder; a single pressure conduit in fluid communication with the outlet of each of the plurality of supply cylinders and into which the working fluid is expelled, the single pressure conduit being connected to the nozzle of the working instrument; at least one actuation device to actuate the pistons; a change-over device to shift the actuation from a first piston corresponding to a first of the plurality of supply cylinders to a next piston corresponding to a next of the plurality of supply cylinders such that the working fluid can be ejected into the single pressure conduit from consecutively emptying supply cylinders; and a change-over magazine that receives the plurality of supply cylinders, wherein the change-over magazine defines chambers, each of which receives and closely surrounds the side wall of the respective one of the plurality of supply cylinders.