Patent ID: 7720544

Claim:
An implantable medical device, comprising: a telemetry circuit; an implantable housing configured to contain at least a portion of the telemetry circuit; an antenna electrically connected to the telemetry circuit at least in part using a feed, the antenna including a helical portion and a non-helical portion, the non-helical portion distinct from and electrically connected to the feed; and wherein the antenna and telemetry circuit are configured to wirelessly transfer information using a specified range of frequencies when the implantable medical device is implanted, the range of frequencies determined at least in part by a physical arrangement of: (1) the helical portion of the antenna with respect to at least one of the non-helical portion of the antenna or the housing; or (2) the non-helical portion of the antenna with respect to at least one of the helical portion of the antenna or the housing.