Battery life estimation based on voltage depletion rate

摘要

Apparatus and methods for estimating the remaining life of a battery in an implantable medical device (“IMD”) are disclosed herein. The terminal voltage of the battery is measured and the measurements create a baseline curve of the battery voltage depletion. The points along the baseline curve can be linearly extrapolated to calculate the voltage depletion rate, which can estimate the remaining life of the battery.

主权项

1. A method for managing a battery powering an implantable medical device (IMD), comprising:
obtaining a first plurality of voltage readings of the battery in the IMD; estimating future battery performance characteristics based upon a linear extrapolation from the first plurality of voltage readings; generating a first baseline curve of a voltage depletion over time for the battery in the IMD under selected operating parameters; generating a first estimate of future battery performance characteristics based upon the linear extrapolation from the first plurality of voltage readings and an initial point of the first baseline curve; modifying one or more operating parameters of the IMD; obtaining a second plurality of voltage readings of the battery in the IMD after modifying one or more operating parameters of the IMD and a delay period; generating a second baseline curve based upon the second plurality of voltage readings; and generating subsequent battery life estimates based upon the linear extrapolation of one or more subsequent voltage readings and the second baseline curve; wherein a length of the delay period reduces one or more errors in the second baseline curve.