Patent ID: 8463395

Claim:
A method for controlling transmission of wireless energy supplied to an electrically operable medical device when implanted in a patient, the method comprising the steps of: transmitting said wireless energy from an external energy source located outside the patient, receiving by an internal energy receiver located inside the patient, the internal energy receiver being connected to the medical device for directly or indirectly supplying received energy thereto, determining an energy balance between the energy received by the internal energy receiver and the total energy used for the medical device, determining the energy balance, by an internal control unit or external control unit, during the transmission of wireless energy, transmitting feed back information from inside the body to be able to control the wireless energy supply sent by the external energy source, and controlling the transmission of wireless energy from the external energy source, based on the determined energy balance, controlling the transmission of wireless energy in accordance with at least one of: an energy reception rate in the internal energy receiver compared to an total rate of used energy being consumption rate, storage rate or combined consumption and storage rate, and directly or indirectly measure over time the difference between the total amount of energy received by the internal energy receiver and the total amount of used energy being consumed, stored or combined consumed and stored energy, and determine the energy balance based on at least one of; said difference and a detected change in said difference.