A bandage has a first sheet overlying a wound and located adjacent to it and a top sheet overlying the first sheet. An upper insertion tube is inserted into a distal end of the primary rod. Web services are accessed using standard web protocols such as XML and HTTP. In order to prevent an intense heating of the metal strand caused by the electromagnetic inductor, the invention provides that the inductor is connected to electric power supply means that supply the inductor with an alternating current whose frequency is less than 500 Hz.