Apparatus and method for estimating battery condition in implantable cardiac devices
First Claim
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1. A cardiac rhythm management device, comprising:
- one or more sensing channels for generating sense signals representing cardiac activity;
one or more pacing channels for delivering pacing therapy;
a battery for supplying power to the device;
a controller for interpreting sense signals and controlling the delivery of paces in accordance with a programmed pacing mode; and
, wherein the controller is further programmed to estimate the battery charge consumption by recording an operational history of the device which includes the number of occurrences or durations of selected events, multiplying each recorded event number or duration by a charge coefficient corresponding to the type of event, and summing the multiplication products.
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Abstract
An apparatus and method for determining the condition of a battery in an implantable cardiac rhythm management device is described. A battery'"'"'s status is determined from a record of the device'"'"'s operational history. The operational history may include the total number of events or event durations recorded during a specified time period. The battery charge consumption is then estimated by means of charge coefficients associated with each type of event.
96 Citations
25 Claims
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1. A cardiac rhythm management device, comprising:
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one or more sensing channels for generating sense signals representing cardiac activity;
one or more pacing channels for delivering pacing therapy;
a battery for supplying power to the device;
a controller for interpreting sense signals and controlling the delivery of paces in accordance with a programmed pacing mode; and
,wherein the controller is further programmed to estimate the battery charge consumption by recording an operational history of the device which includes the number of occurrences or durations of selected events, multiplying each recorded event number or duration by a charge coefficient corresponding to the type of event, and summing the multiplication products. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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2. The device of claim I further comprising circuitry for measuring the battery voltage and wherein the controller is further programmed to adjust the estimated charge consumption based upon the measured battery voltage.
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16. A system, comprising:
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an implantable cardiac device which includes;
one or more sensing channels for generating sense signals representing cardiac activity;
one or more pacing channels for delivering pacing therapy;
a battery for supplying power to the device;
a controller for interpreting sense signals and controlling the delivery of paces in accordance with a programmed pacing mode; and
,wherein the controller is further programmed to record an operational history of the device which includes the number of occurrences or durations of selected events;
an external programmer in communication with the implantable cardiac device via a telemetry link over which the recorded operational history of the device may be downloaded, wherein the external programmer is programmed to estimate the battery charge consumption by multiplying each recorded event number or duration by a charge coefficient corresponding to the type of event and summing the multiplication products. - View Dependent Claims (17, 18, 19, 20)
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21. A method for estimating battery charge consumption in a cardiac rhythm management device, comprising:
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recording an operational history of the device which includes the number of occurrences or durations of selected events;
multiplying each recorded event number or duration by a charge coefficient corresponding to the type of event; and
,summing the multiplication products. - View Dependent Claims (22, 23, 24, 25)
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Specification