A compressed gas motor and methods comprise a working plunger and a control plunger arranged in the internal space between the working plunger and a closed rear side such as to be mobile in linear direction. The control plunger, in a first position, covers a gas outlet opening and does not cover the gas inlet opening and, in a second position, covers the gas inlet opening and does not cover the gas outlet opening. The control plunger is supported as in a bearing such as to be mobile with respect to the working plunger, and a catch element is arranged on said working plunger and/or control plunger and pulls the control plunger in the direction of the working plunger, at a first distance, when the working plunger moves away from the control plunger, as well as a lavage system comprising said compressed gas motor.
