Patent ID: 7539541

Claim:
An implantable apparatus comprising: a plurality of telemetry circuits including a far field telemetry circuit and a near field telemetry circuit, each telemetry circuit configured to wirelessly communicate with an external device; a power controller coupled to the far field telemetry circuit and a power supply; and a processor coupled to the power controller and configured to selectively provide a power signal to the power controller, wherein the power controller manages power from the power supply delivered to the far field telemetry circuit as a function of the power signal, and wherein the processor is configured to: establish a near field link upon detecting a synchronization signal using the near field telemetry circuit; cause the power controller to power the far field telemetry circuit upon detecting absence of a synchronization signal using the near field telemetry circuit and to place the telemetry circuits in an out-of-synchronization state, wherein the near field and far field telemetry circuits both wait to detect a synchronization signal during the absence of a synchronization signal while in the out-of-synchronization state; transition from the out-of-synchronization state to establish a far field communication session upon detecting a synchronization signal using the far field communication circuit; and cause the power controller to remove power to the far field telemetry circuit upon detecting absence of a synchronization signal using the far field telemetry circuit upon expiration of a predetermined period of inactivity.