The invention relates to a medical device (12) comprising an electrical measurement circuit (16), in which are connected at least two sensors (22) with variable impedance according to a physical magnitude detected, an electric energy source (18) for powering the electric measurement circuit (16), an antenna (18) for emitting an electromagnetic field in accordance with the impedance of the electrical measurement circuit (16), each of the sensors (22) being associated with a switch (24) so as to short-circuit the sensor (22) in said measurement circuit (16), the medical device (12) also including a system (26) for controlling the switches (24) in order consecutively to control the opening or the closing of the switches (24), according to predetermined configurations. In particular, the medical device (12) can be used on the human body or implanted in the human body.