Power supply monitoring for an implantable device
First Claim
1. A method for determining a time period remaining in a useful life of an energy storage device in an implantable medical device, the method comprising:
- measuring a voltage of the energy storage device to produce a measured voltage;
comparing the measured voltage to a transition voltage;
while the measured voltage is greater than or equal to the transition voltage, determining a time period remaining in the energy storage device'"'"'s useful life based upon a function of charge depleted; and
while the measured voltage is less than the transition voltage, performing a calculation using a higher order polynomial function of the measured voltage and determining a time period remaining in the energy storage device'"'"'s useful life based upon said calculation;
wherein the transition voltage corresponds to a predetermined point on an energy storage device voltage depletion curve representing the voltage across the energy storage device over time.
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Accused Products
Abstract
A method and an apparatus for determining a time period remaining in a useful life of an energy storage device in an implantable medical device. The method may include measuring a voltage of the energy storage device to produce a measured voltage, and comparing the measured voltage to a transition voltage. While the measured voltage is greater than or equal to the transition voltage, the time period remaining in the energy storage device'"'"'s useful life is approximated based upon a function of charge depleted. While the measured voltage is less than the transition voltage, the time period remaining in the energy storage device'"'"'s useful life is approximated based upon a higher order polynomial function of the measured voltage. The transition voltage corresponds to a predetermined point on a energy storage device voltage depletion curve representing the voltage across the energy storage device over time.
21 Citations
11 Claims
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1. A method for determining a time period remaining in a useful life of an energy storage device in an implantable medical device, the method comprising:
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measuring a voltage of the energy storage device to produce a measured voltage; comparing the measured voltage to a transition voltage; while the measured voltage is greater than or equal to the transition voltage, determining a time period remaining in the energy storage device'"'"'s useful life based upon a function of charge depleted; and while the measured voltage is less than the transition voltage, performing a calculation using a higher order polynomial function of the measured voltage and determining a time period remaining in the energy storage device'"'"'s useful life based upon said calculation; wherein the transition voltage corresponds to a predetermined point on an energy storage device voltage depletion curve representing the voltage across the energy storage device over time. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification