Patent ID: 7769466
Filing Date: 2010-08-03
Classification: A61N,H03F

Abstract:
1. A medical apparatus comprising: an extracorporeal power source having a power transmitter that produces a radio frequency signal and an antenna that is connected to the power transmitter, the power transmitter including a source of the radio frequency signal, a Class-E amplifier that comprises a switch; the power source comprising a pulse width modulator that receives the radio frequency signal and a control signal and in response thereto produces an output signal that is applied to a control input of the switch; an output sensor which provides a feedback signal indicating an intensity of radio frequency signal applied to the antenna, and wherein the pulse width modulator responds to the feedback signal by varying the output signal; and a medical device for implantation inside an animal, the medical device receiving the radio frequency signal transmitted from the antenna and deriving an electrical voltage from energy of the radio frequency signal which electrical voltage powers components of the medical device.