The present invention relates to a
medical device (1) comprising: a holder (2) that may be applied to the
skin of a patient, a
biofuel cell (3), a pump (4) configured for supplying blood to the
biofuel cell (3), a sensor (5) configured to emit a
signal representative of a blood parameter, a
control unit (50) connected to the pump and the sensor, and a rechargeable battery (6) electrically connected to the
biofuel cell (3). The
control unit is configured to perform a recharging procedure comprising the following steps:
processing the
signal emitted by the sensor, estimating a value of the blood parameter of the patient, comparing said estimated value with a threshold value, and, based on said comparison, commanding the activation of the pump for delivering a predetermined amount of blood to the biofuel cell for generation
electricity and recharging the battery.