| abstract |
An implantable medical device, such as a bi-directional infuser device for hydraulicallyncontrolling an artificial sphincter (e.g., adjustable gastric band) benefits from being remotelynpowered by transcutaneous energy transfer (TET), obviating the need for batteries. In ordernfor active components in the medical device to operate, a sinusoidal power signal received byna secondary coil is rectified and filtered. An amount of power transferred is modulated. Innone version, a voltage comparison is made of a resulting power supply voltage as referencednto a threshold to control pulse width modulation (PWM) of the received sinusoidal powernsignal, achieving voltage regulation. Versions incorporate detuning or uncoupling of thensecondary coil to achieve PWM control without causing excessive heating of the medicalndevice. |