System and method for determining remaining battery life for an implantable medical device
First Claim
1. In an implantable medical device (IMD) that is powered by a battery exhibiting a characteristic voltage drop at any given current drain from a beginning-of-life battery voltage to an elective replacement indicator battery voltage, the IMD imposing a quiescent current drain on the battery and periodically imposes an episodic current drain on the battery in an energy consuming incident including one or more of delivery of a therapy through a therapy delivery channel or monitoring a physiologic condition through a monitoring channel, the quiescent and episodic current drain consuming battery energy that cumulatively causes battery voltage to drop, a method of estimating the remaining life of the battery until battery voltage drops to the elective replacement indicator battery voltage comprising the steps of:
- periodically measuring battery voltage and averaging a plurality of battery voltage measurements to derive an average measured battery voltage;
estimating the estimated past current drain of the IMD comprising an average of the sum of the quiescent current drain and the episodic current drain; and
determining the estimated remaining longevity from the measured voltage and the estimated past current drain.
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Abstract
A system and method for determining a remaining life estimate of the remaining battery life of a battery of an implantable medical device (IMD). The IMD battery preferably exhibits a highly reproducible monotonically decreasing discharge curve. The estimated remaining life estimates are derived by periodically measuring battery voltage, and estimating the estimated past current drain of the IMD comprising an average of the sum of the quiescent current drain and therapy delivery current drain, and determining the estimated remaining longevity from the measured voltage and the estimated past current drain.
68 Citations
35 Claims
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1. In an implantable medical device (IMD) that is powered by a battery exhibiting a characteristic voltage drop at any given current drain from a beginning-of-life battery voltage to an elective replacement indicator battery voltage, the IMD imposing a quiescent current drain on the battery and periodically imposes an episodic current drain on the battery in an energy consuming incident including one or more of delivery of a therapy through a therapy delivery channel or monitoring a physiologic condition through a monitoring channel, the quiescent and episodic current drain consuming battery energy that cumulatively causes battery voltage to drop, a method of estimating the remaining life of the battery until battery voltage drops to the elective replacement indicator battery voltage comprising the steps of:
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periodically measuring battery voltage and averaging a plurality of battery voltage measurements to derive an average measured battery voltage;
estimating the estimated past current drain of the IMD comprising an average of the sum of the quiescent current drain and the episodic current drain; and
determining the estimated remaining longevity from the measured voltage and the estimated past current drain. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. An implantable medical device (IMD) that is powered by a battery exhibiting a characteristic voltage drop at any given current drain from a beginning-of-life battery voltage to an elective replacement indicator battery voltage, the IMD imposing a quiescent current drain on the battery and periodically imposes an episodic current drain on the battery in an energy consuming incident including one or more of delivery of a therapy through a therapy delivery channel or monitoring a physiologic condition through a monitoring channel, the quiescent and episodic current drain consuming battery energy that cumulatively causes battery voltage to drop, a method of estimating the remaining life of the battery until battery voltage drops to the elective replacement indicator battery voltage, the IMD further comprising:
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means for periodically measuring battery voltage and averaging a plurality of battery voltage measurements to derive an average measured battery voltage;
estimating means for estimating the estimated past current drain of the IMD comprising an average of the sum of the quiescent current drain and episodic current drain; and
determining means for determining the estimated remaining longevity from the measured voltage and the estimated past current drain. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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25. A method of estimating remaining life of a battery that powers an implantable medical device (IMD), comprising the steps of:
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obtaining a measurement indicative of voltage provided by the battery;
obtaining an estimation of past current drain on the battery; and
determining the estimated remaining life of the battery from the measurement indicative of voltage and the estimation of past current drain. - View Dependent Claims (26, 27, 28, 29, 30, 31, 32)
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33. A system for monitoring life of a battery, comprising:
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a sensing circuit to measure voltage provided by the battery; and
a processing circuit coupled to the sensing circuit to calculate past current drain on the battery and to further determine, based on the measured voltage and the past current drain, an estimated remaining life of the battery. - View Dependent Claims (34, 35)
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Specification