Patent ID: 6167310
Filing Date: 2000-12-26
Classification: A61N

Abstract:
An implantable medical device telemetry method for downlink transmission of telemetry signals between a transmitter of an external communication device and a receiver of an implantable medical device, the method comprising the steps of:providing one or more downlink control bursts from the transmitter, wherein each downlink control burst is defined by a ramped envelope having a burst duration and a peak amplitude;detecting one or more of the downlink control bursts received at the receiver of the implanted medical device from the transmitter and generating a downlink strength signal representative of the strength of the one or more downlink control bursts;providing a plurality of downlink data bursts from the transmitter, wherein the plurality of downlink data bursts are modulated with data, and further wherein each downlink data burst is defined by a ramped envelope having a burst duration and a peak amplitude; andcontrolling the peak amplitude of the plurality of downlink data bursts by adjusting the burst duration of the ramped envelope as a function of the downlink strength signal.