Method and circuit for determining the battery status in a medical implant
First Claim
1. A method for detecting a status of a battery in an implantable heart stimulator, comprising the steps of:
- measuring an impedance of a battery in an implantable heart stimulator;
detecting an increased value of said impedance;
determining an impedance-based value of a remaining capacity of said battery from the detected increase in impedance;
analyzing said increase in impedance and determining whether said increase in impedance indicates that said impedance-based value of the remaining capacity of the battery is reliable;
if said impedance-based value of the remaining capacity of the battery is not reliable, measuring a total charge depleted from said battery; and
determining a charge depletion-based value of the remaining capacity of the battery.
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Accused Products
Abstract
In a method and an apparatus for detecting the status of a battery in an implantable heart stimulator, the battery impedances measured and an increased value of the measured impedance is detected, from which an impedance based value of the remaining battery capacity is determined. The increase in impedance is analyzed to determine whether the impedance increase is a reliable indicator of the remaining battery capacity. If it is determined that the impedance increase is not reliable for determining the battery capacity, the total charge depletion of the battery is measured and a charge depletion-based value of the remaining battery capacity is determined.
56 Citations
10 Claims
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1. A method for detecting a status of a battery in an implantable heart stimulator, comprising the steps of:
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measuring an impedance of a battery in an implantable heart stimulator;
detecting an increased value of said impedance;
determining an impedance-based value of a remaining capacity of said battery from the detected increase in impedance;
analyzing said increase in impedance and determining whether said increase in impedance indicates that said impedance-based value of the remaining capacity of the battery is reliable;
if said impedance-based value of the remaining capacity of the battery is not reliable, measuring a total charge depleted from said battery; and
determining a charge depletion-based value of the remaining capacity of the battery. - View Dependent Claims (2, 3, 4)
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5. A battery status detecting circuit for an implantable heart stimulator comprising:
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a first measurement unit for measuring an impedance of a battery in an implantable heart stimulator;
a detector supplied with the measured impedance for detecting an increased value of said measured impedance;
a first determination unit for determining an impedance-based value of a remaining capacity of the battery from the detected increase in impedance;
an analyzer which analyzes said increase in impedance to determine whether said increase in impedance is reliable for indicating said remaining capacity of the battery;
a second measurement unit for measuring a total charge depleted from the battery; and
a second determination unit supplied with a measurement of the depleted charge for determining a charge-depletion based value of the remaining capacity of the battery, only if said analyzer determines that said increase in impedance is not reliable for determining said remaining capacity of the battery. - View Dependent Claims (6, 7, 8, 9, 10)
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Specification