The invention relates to a controlled stand-alone matrix system (1) for the controlled and variable distribution of at least one active substance solely at precise appropriate moments, characterised in that it comprises a polymer matrix (2) loaded with the active substance, at least one heating element (4) embedded in the loaded matrix (2), and an electricity generator (5) connected to an electronic control card in turn connected to the heating element (4), the electricity supplied to same by the generator (5) being controlled by the card which is housed in an electronic box (3).
