TECHNIQUES FOR MINIMIZING CURRENT DRAIN IN AN IMPLANTABLE MEDICAL DEVICE

摘要

An implantable medical device includes circuitry for generating and delivering electrical stimulation therapy. A power source is included in the implantable medical device for storage of the energy for the stimulation therapy. Techniques and circuits are provided for minimizing energy losses associated with the storage of the stimulation therapy energy. The implantable medical device circuitry includes charging circuitry that is operated in at least a first mode and a second mode, such that the charging circuit is operable in one of the at least first and second modes based on whether an intrinsic cardiac event is detected. The charging circuit is operable to withhold charging the output capacitor in the first mode until a given cardiac cycle elapses without a sensed intrinsic cardiac event.

主权项

1. An implantable medical device, comprising:
a sense amplifier configured to sense intrinsic cardiac events; an output capacitor; a charging circuit coupled to the output capacitor; a processor coupled to the sense amplifier and to the charging circuit, wherein the processor is configured to selectively operate the charging circuit in a first mode or a second mode, wherein the charging circuit is controlled to withhold charging of the output capacitor until a given cardiac cycle elapses without a sensed intrinsic cardiac event during operation in the first mode, and wherein the charging circuit is controlled to initiate charging of the output capacitor within the given cardiac cycle prior to elapsing of the given cardiac cycle during operation in the second mode.