Energy-optimized data transmission of a medical device

A medical system comprising: a medical device (1) for use on and / or in the body of a user with a transmitting unit and / or receiving unit (5), an activation switch (6) and an energy source characterized by a remote control (2) having a data input unit through which the user can enter control signals, an activation unit (6 ', 6' ') for activating the activation switch (6) of the medical device (1) and a transmitting and / or receiving unit (5 '), which (with the transmitter unit and / or receiving unit 5) of the medical device (1) can exchange data; in which the activation switch (6) is adapted to establish a connection between the transmitter unit and / or receiving unit (5) and the power source when an activation signal from the activation switch (6) has been received.