System and method for monitoring or reporting battery status of implantable medical device
First Claim
1. A method comprising:
- measuring a battery terminal voltage of a battery of an implantable medical device;
measuring a charge delivered by the battery during a first time period after the device has been implanted and before the battery terminal voltage falls below a first voltage threshold, wherein the first voltage threshold is a function of a rate at which the charge is delivered by the battery;
calculating an available or depleted battery charge using the measured charge delivered by the battery during the first time period;
communicating to a user an indication of the available or depleted battery charge; and
communicating to the user an indication of whether the battery terminal voltage has fallen below the first voltage threshold.
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Accused Products
Abstract
This document discusses, among other things, a system and method of monitoring or reporting battery status of an implantable medical device. The battery terminal voltage and charge delivered are measured. Before the battery terminal voltage falls below an Elective Replacement Indicator (ERI) threshold voltage, a charge-delivered indication of battery status is provided. Thereafter, a battery terminal voltage indication of battery status is provided. The Elective Replacement Indicator (ERI) and End of Life (EOL) threshold voltages are each functions of delivered battery current. A fault current detection is also provided. A device temperature sensor discounts the battery voltage reading when the device is too cold.
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Citations
23 Claims
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1. A method comprising:
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measuring a battery terminal voltage of a battery of an implantable medical device;
measuring a charge delivered by the battery during a first time period after the device has been implanted and before the battery terminal voltage falls below a first voltage threshold, wherein the first voltage threshold is a function of a rate at which the charge is delivered by the battery;
calculating an available or depleted battery charge using the measured charge delivered by the battery during the first time period;
communicating to a user an indication of the available or depleted battery charge; and
communicating to the user an indication of whether the battery terminal voltage has fallen below the first voltage threshold. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A computer-readable medium including computer-executable instructions for performing a method comprising:
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measuring a battery terminal voltage of a battery of an implantable medical device;
measuring a charge delivered by the battery during a first time period after the device has been implanted and before the battery terminal voltage falls below a first voltage threshold, wherein the first voltage threshold is a function of a rate at which the charge is delivered by the battery;
calculating an available or depleted battery charge using the measured charge delivered by the battery during the first time period;
communicating to a user an indication of the available or depleted battery charge; and
communicating to the user an indication of whether the battery terminal voltage has fallen below the first voltage threshold.
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15. A system comprising:
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an implantable medical device, the implantable medical device comprising;
a battery;
a battery terminal voltage measurement circuit, coupled to the battery, to measure a battery terminal voltage;
a battery charge delivery measurement circuit, coupled to the battery, to monitor a charge delivered by the battery;
a controller circuit, coupled to the battery terminal voltage measurement circuit to receive information about the measured battery terminal voltage, the controller circuit also coupled to the battery charge delivery measurement circuit to receive information about a rate at which charge is delivered from the battery, the controller circuit operative to compare the measured battery terminal voltage to a first voltage threshold, the controller circuit operative to compute the first voltage threshold using the information about the rate at which charge is delivered from the battery, the controller circuit operative to calculate an available or depleted battery charge using the measured charge delivered by the battery during a first time period after the device has been implanted and before the battery terminal voltage falls below the first voltage threshold; and
a communication circuit, coupled to the controller, to communicate from the implantable device an indication of the available or depleted battery charge and an indication of whether the battery terminal voltage has fallen below the first voltage threshold. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22)
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23. A system comprising:
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an implantable medical device, the implantable medical device comprising;
a battery;
a battery terminal voltage measurement circuit, coupled to the battery, to measure a battery terminal voltage;
a battery charge delivery measurement circuit, coupled to the battery, to monitor a charge delivered by the battery;
means, coupled to the battery terminal voltage measurement circuit and the battery charge delivery measurement circuit, for comparing the measured battery terminal voltage to a first voltage threshold;
means, coupled to the battery charge delivery measurement circuit, for calculating an available or depleted battery charge using the measured charge delivered by the battery during a first time period after the device has been implanted and before the battery terminal voltage falls below the first voltage threshold; and
a communication circuit, coupled to the controller, to communicate from the implantable device an indication of the available or depleted battery charge and an indication of whether the battery terminal voltage has fallen below the first voltage threshold.
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Specification