Abstract: The invention relates to an electrically operated medical apparatus, such as an electro-surgical apparatus comprising an electrical instrument which can be handled by a person and which is connectable or connected to an electrically operated feed and control apparatus, such as a high-frequency surgical apparatus, which is connected to a switch to be actuated by the person, by means of which a switching signal initiated by him can switch on and off one or more functions of the electrical instrument in the feed and control apparatus. In accordance with the present teaching, the switch is associated with a transmitter part which converts the switching signals into signals which can be transmitted without wires and which are transmitted via a transmitting element to a receiving element of a receiving station. The receiving element is connected to the switching input of the feed and control apparatus and transmits to the feed and control apparatus a control signal corresponding to the switching signal.