System and method for measuring battery current
First Claim
1. A method, comprising:
- measuring current drawn from a battery by a pulse generator in an implantable medical device using a current measurement device; and
calibrating the current measurement device when measuring the current drawn from the battery by the pulse generator.
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Abstract
Systems, devices and methods are provided for measuring battery current. According to one aspect, a medical device is provided that comprises a battery, a pulse generator, and a current measuring device. The pulse generator draws a pulse generator current from the power source, and the current measuring device determines the pulse generator current or tracks charge depletion from the battery. The current measuring device comprises an oscillator and a counter. The oscillator produces an oscillating output with a frequency of oscillation dependent on the pulse generator current, and the counter provides an oscillation count for the oscillating output. The current measuring device is capable of being calibrated while continuously determining the pulse generator current. In one embodiment, the current measuring device includes at least two current sources, each including an operational amplifier that has an autozeroing feature.
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Citations
23 Claims
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1. A method, comprising:
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measuring current drawn from a battery by a pulse generator in an implantable medical device using a current measurement device; and
calibrating the current measurement device when measuring the current drawn from the battery by the pulse generator. - View Dependent Claims (2, 3, 4)
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5. A method, comprising:
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providing circuitry adapted to draw current from a battery and adapted to provide medical therapy;
providing a current measurement circuit to measure the current drawn from the battery; and
providing redundancy in the current measurement circuit to allow calibration of the current measurement circuit during the measurement of the current drawn from the battery. - View Dependent Claims (6, 7, 8)
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9. A method for determining battery status of an implantable medical device, comprising:
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determining a replacement percentage for a battery of an implantable medical device, as a function of a total charge capacity for the battery;
measuring charge depleted from the battery by a pulse generator in the implantable medical device using a current measurement device;
calibrating the current measurement device when measuring the charge depleted from the battery by the pulse generator; and
providing an indication of battery status when remaining charge in the battery equals the replacement percentage. - View Dependent Claims (10, 11, 12)
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13. A method for detecting potential faults in an implantable medical device, comprising:
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determining an upper limit for current from a battery of the implantable medical device;
measuring current drained from the battery by a pulse generator in the implantable medical device using a current measurement device; and
calibrating the current measurement device when measuring the current drained from the battery by the pulse generator. - View Dependent Claims (14)
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15. A method for reporting drain current in an implantable medical device, comprising:
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measuring current drained from the battery by a pulse generator in the implantable medical device using a current measurement circuit;
calibrating the current measurement circuit when measuring the current drained from the battery by the pulse generator;
disconnecting a telemetry circuit from the current measurement circuit in preparation for a telemetry session; and
interrogating the implantable medical device via telemetry to obtain a drain current report. - View Dependent Claims (16)
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17. An implantable medical device, comprising:
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a pulse generator adapted to draw current from a battery;
an electrode system in electrical communication with the pulse generator and adapted to provide electrical therapy to a patient; and
a current measuring device adapted to measure current drawn from the battery by the pulse generator and adapted to calibrate the current measuring device when measuring the current drawn from the battery by the pulse generator. - View Dependent Claims (18, 19, 20, 21, 22, 23)
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Specification