Power supply monitoring for an implantable device
First Claim
1. An implantable medical device, comprising:
- an energy storage device to provide power for an operation performed by said implantable medical device, characterized by a total available electrical charge defined by the difference between an initial electrical charge and a final electrical charge;
a stimulation unit, operatively coupled to said energy storage device for providing a stimulation signal;
a memory adapted to store an active charge depletion rate determined during a calibration process and an inactive charge depletion rate determined during the calibration process; and
a controller operatively coupled to said stimulation unit and said energy storage device, said controller comprising;
an active charge depletion determination unit adapted to determine an electrical charge depleted from said energy storage device during stimulation operations of the implantable medical device based upon said active charge depletion rate and a predetermined current associated with said stimulation signal;
an inactive charge depletion determination unit adapted to determine an electrical charge depleted from said energy storage device during inactive periods based upon said inactive charge depletion rate and inactive periods of the implantable medical device; and
an end of service determination unit adapted to determine a time period until an end of service of said energy storage device based upon said total available electrical charge, said active charge depletion, and said inactive charge depletion.
7 Assignments
0 Petitions
Accused Products
Abstract
A method and an apparatus for projecting an end of service (EOS) and/or an elective replacement indication (ERI) of a component in an implantable device and for determining an impedance experienced by a lead associated with the implantable device. An active charge depletion of an implantable device is determined. An inactive charge depletion of the implantable device is determined. A time period until an end of service (EOS) and/or elective replacement indication (ERI) of a power supply associated with the IMD based upon the active charge depletion, the inactive charge depletion, and the initial and final (EOS) battery charges, is determined. Furthermore, to determine the impedance described above, a substantially constant current signal is provided through a first terminal and a second terminal of the lead. A voltage across the first and second terminals is measured. An impedance across the first and second terminals is determined based upon the constant current signal and the measured voltage.
182 Citations
9 Claims
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1. An implantable medical device, comprising:
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an energy storage device to provide power for an operation performed by said implantable medical device, characterized by a total available electrical charge defined by the difference between an initial electrical charge and a final electrical charge; a stimulation unit, operatively coupled to said energy storage device for providing a stimulation signal; a memory adapted to store an active charge depletion rate determined during a calibration process and an inactive charge depletion rate determined during the calibration process; and a controller operatively coupled to said stimulation unit and said energy storage device, said controller comprising; an active charge depletion determination unit adapted to determine an electrical charge depleted from said energy storage device during stimulation operations of the implantable medical device based upon said active charge depletion rate and a predetermined current associated with said stimulation signal; an inactive charge depletion determination unit adapted to determine an electrical charge depleted from said energy storage device during inactive periods based upon said inactive charge depletion rate and inactive periods of the implantable medical device; and an end of service determination unit adapted to determine a time period until an end of service of said energy storage device based upon said total available electrical charge, said active charge depletion, and said inactive charge depletion. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification