SYSTEM AND METHOD FOR MONITORING A POWER SOURCE OF AN IMPLANTABLE MEDICAL DEVICE
First Claim
1. For use in an implantable medical device that contains a battery, a system for monitoring the battery, comprising:
- a first current source associated with a current having a first predetermined amplitude;
a second current source associated with a current having a second predetermined amplitude; and
a control circuit coupled to the first current source and the second current source to activate the first current source and obtain a first voltage measurement across the battery while the first current source is activated and to activate a second current source and obtain a second voltage measurement across the battery while the second current source is activated, and whereby impedance of the battery is determined from the first and the second predetermined amplitudes and the first and the second voltage measurements.
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Abstract
Techniques for monitoring a battery of an implantable medical device are disclosed. First and second current sources are provided to draw currents having amplitudes of I1 and I2, respectively, from the battery. First and second voltage measurements, V1 and V2, are obtained when first and second combinations, respectively, of the first and second current sources are selectively activated. Battery impedance is determined using the current amplitudes I1 and I2 and the voltage measurements V1 and V2. The impedance measurement may be used to obtain an open-circuit voltage of the battery without the need to disconnect the battery from circuitry to which it provides power. Battery impedance and/or open-circuit battery voltage may then be used to determine an estimated time until an action is required involving the battery, which may include activation of an ERI or EOL indicator, or initiation of a recharge session.
108 Citations
34 Claims
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1. For use in an implantable medical device that contains a battery, a system for monitoring the battery, comprising:
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a first current source associated with a current having a first predetermined amplitude; a second current source associated with a current having a second predetermined amplitude; and a control circuit coupled to the first current source and the second current source to activate the first current source and obtain a first voltage measurement across the battery while the first current source is activated and to activate a second current source and obtain a second voltage measurement across the battery while the second current source is activated, and whereby impedance of the battery is determined from the first and the second predetermined amplitudes and the first and the second voltage measurements. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method of monitoring a battery supplying power to an implantable medical device, comprising:
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activating a first current source that sources or sinks a current of a first predetermined amplitude; obtaining a first voltage measurement while the first current source is activated; activating a second current source that sources or sinks a current of a second predetermined amplitude; obtaining a second voltage measurement while the second current source is activated; and determining impedance of the battery from the first predetermined amplitude, the second predetermined amplitude, the first voltage measurement, and the second voltage measurement. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23)
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24. A system for monitoring a battery of an implantable medical device that is implanted in a body, comprising:
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a first current source that causes a current of a first predetermined amplitude to be drawn from the battery; a second current source that causes a current of a second predetermined amplitude to be drawn from the battery; and a measurement circuit to measure a first voltage across the battery when a first combination of the first and second current sources is activated and to measure a second voltage across the battery when a different combination of the first and the second current sources is activated, whereby impedance of the battery is determined from the first predetermined amplitude, the second predetermined amplitude, the first voltage, and the second voltage. - View Dependent Claims (25, 26, 27, 28, 29, 30, 31, 32)
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33. A system for monitoring a battery of an implantable medical device, comprising:
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first current source means for causing a battery to provide a current of a first predetermined amplitude; second current source means for causing a battery to provide a current of a second predetermined amplitude; measurement means for obtaining a first voltage measurement across the battery when a first combination of the first current source means and the second current source means are selectively activated, and for obtaining a second voltage measurement across the battery when a second combination of the first current source means and the second current source means is selectively activated; and control means for determining impedance of the battery based on the first predetermined amplitude, the second predetermined amplitude, the first voltage measurement, and the second voltage measurement.
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34. A method of monitoring a battery supplying power to an implantable medical device that is implanted in a living body, comprising:
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generating a first current having a first predetermined amplitude; obtaining a first voltage measurement across the battery while the first current is being generated; generating a second current having a second predetermined amplitude; obtaining a second voltage measurement across the battery while the second current source is activated; and determining impedance of the battery from the first predetermined amplitude, the second predetermined amplitude, the first voltage measurement, and the second voltage measurement.
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Specification