Determining and forecasting end of life for an implantable medical device having a rechargeable battery
First Claim
1. A system, comprising:
- an implantable medical device comprising a rechargeable battery and control circuitry, wherein the control circuitry is configured to estimate a capacity of the rechargeable battery at different points in time during operation of the implantable medical device and configured to determine at least one first parameter during each previous charging session of the rechargeable battery, wherein each of the capacities are estimated using the determined at least one parameter, wherein the control circuitry is further configured to determine a forecasted end of life of the implantable medical device using the estimated capacities; and
an external device configured to receive and display the forecasted end of life of the implantable medical device.
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Abstract
An algorithm programmed into the control circuitry of a rechargeable-battery Implantable Medical Device (IMD) is disclosed that can quantitatively forecast and determine the timing of an early replacement indicator (tEOLi) and an IMD End of Life (tEOL). These forecasts and determinations of tEOLi and tEOL occur in accordance with one or more parameters having an effect on rechargeable battery capacity, such as number of charging cycles, charging current, discharge depth, load current, and battery calendar age. The algorithm consults such parameters as stored over the history of the operation of the IMD in a parameter log, and in conjunction with a battery capacity database reflective of the effect of these parameters on battery capacity, determines and forecasts tEOLi and tEOL. Such forecasted or determined values may also be used by a shutdown algorithm to suspend therapeutic operation of the IMD.
31 Citations
20 Claims
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1. A system, comprising:
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an implantable medical device comprising a rechargeable battery and control circuitry, wherein the control circuitry is configured to estimate a capacity of the rechargeable battery at different points in time during operation of the implantable medical device and configured to determine at least one first parameter during each previous charging session of the rechargeable battery, wherein each of the capacities are estimated using the determined at least one parameter, wherein the control circuitry is further configured to determine a forecasted end of life of the implantable medical device using the estimated capacities; and an external device configured to receive and display the forecasted end of life of the implantable medical device. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification