Abstract: A medical apparatus having an application device which can be brought into contact with a patient to be treated, and a galvanic isolator which can be connected to the application device, the isolator having at least one application connector for connection to the application device and at least one supply connector for connection to a device. The isolator is configured to galvanically isolate the application connector from the supply connector. The isolator has at least one first radio unit connected to the application connector, and at least one second radio unit connected to the supply connector. The first antenna and second antenna are fixed on a carrier at a visible distance from each other. The at least one first radio unit and the at least one second radio unit are configured to transmit signals and/or data between the application connector and the supply connector.