Circuit for discriminating between battery charging signals and rf telemetry signals received by a single coil in an implantable medical device

Abstract

A medical device for providing a stimulation therapy includes a coil configured to receive both inductive charging and telemetry signals. The inductive charging signals are in a first frequency band. The telemetry signals are in a second frequency band higher than the first frequency band. The medical device includes inductive charging circuitry configured to provide electrical power to the medical device via the inductive charging signals. The medical device includes telemetry circuitry configured to conduct telecommunications with external device via the telemetry signals. The medical device includes a first component electrically coupled between the coil and the inductive charging circuitry. The first component is configured to allow the inductive charging signals to pass through. The medical device includes a second component electrically coupled between the coil and the telemetry circuitry. The second component is configured to substantially block the inductive charging signals while allowing the telemetry signals to pass through.