Power supply monitoring for an implantable device
First Claim
7. A method for determining the remaining useful life of an energy storage device in an implantable medical device, said energy storage device having a total available electrical charge that may be obtained from said energy storage device, said method comprising:
- determining an active charge depletion of the implantable medical device;
determining an inactive charge depletion of said implantable medical device; and
determining a time period until an end of service of the energy storage device based upon said active charge depletion, said inactive charge depletion, and said total available charge.
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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.
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Citations
64 Claims
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7. A method for determining the remaining useful life of an energy storage device in an implantable medical device, said energy storage device having a total available electrical charge that may be obtained from said energy storage device, said method comprising:
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determining an active charge depletion of the implantable medical device;
determining an inactive charge depletion of said implantable medical device; and
determining a time period until an end of service of the energy storage device based upon said active charge depletion, said inactive charge depletion, and said total available charge. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. A method for determining a time period until an end of service of an energy storage device in an implantable medical device, said energy storage device comprising an initial charge corresponding to a substantially full charge and a final charge corresponding to an end of useful life, comprising:
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determining an idle current usage rate for at least one future idle period of an implantable medical device;
determining charge depleted during at least one previous idle period;
determining a stimulation current usage rate for at least one future stimulation to be performed by said implantable medical device;
determining charge depleted during a previous stimulation performed by said implantable medical device;
determining a total charge depleted by said implantable medical device based upon said charge depleted during said previous idle period and said charge depleted during said previous stimulation by said implantable medical device;
determining a future combined current usage based upon said idle current usage rate and said stimulation current usage rate; and
determining a time period until an end of service of the energy storage device based upon said total charge depleted, said future combined current usage rate, said initial battery charge and said final battery charge. - View Dependent Claims (24, 25, 26, 27)
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28. A method for determining the remaining useful life of a battery in an implantable medical device, said battery having a first charge and a second charge less than said first charge comprising:
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determining a total available charge for said battery comprising the difference between said first charge and said second charge;
determining a charge depletion of the implantable medical device; and
determining a time period until an end of service of a power supply associated with said implantable medical device based upon said charge depletion and said total available charge.
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29. A method for determining a remaining time until the end of service of a battery of an implantable medical device, said battery comprising a total available electrical charge that may be obtained from said battery, said method comprising:
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determining a previous active charge depletion of an implantable device;
determining a future active current usage rate of said implantable device;
determining a previous inactive charge depletion of said implantable device;
determining a future inactive current usage rate of said implantable device;
determining a remaining time period until an end of service of said battery based upon said total available electrical charge, said previous active charge depletion, said future active current usage rate, said previous inactive charge depletion, and said future inactive current usage rate. - View Dependent Claims (30, 31, 32, 33)
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34. 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; 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 by said energy storage device during stimulation operations of the implantable medical device;
an inactive charge depletion determination unit adapted to determine an electrical charge depleted by said energy storage device during 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 (35, 36, 37, 38, 39, 40, 41, 42)
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43. A system for determining remaining useful life of a battery in an implantable medical device, comprising:
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an external monitoring device for performing remote communications with an implantable medical device;
an implantable medical device adapted to communicate with said external device and to deliver a stimulation signal to a patient, said implantable device comprising;
a battery to provide power for an operation performed by said implantable medical device;
a communications unit to provide for communications between said external monitoring device and said implantable medical device;
a stimulation unit, operatively coupled to said battery, to provide a stimulation signal; and
a controller operatively coupled to said stimulation unit and said battery, said controller being adapted to determine;
an active charge depletion of said implantable medical device;
an inactive charge depletion of said implantable medical device; and
a time period until an end of service of said battery based upon said active charge depletion and said inactive charge depletion. - View Dependent Claims (44, 45, 46, 47, 48, 49, 50, 51, 52, 53)
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54. A computer readable program storage device encoded with instructions that, when executed by a computer, performs a method, comprising:
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determining an active charge depletion of an implantable medical device;
determining an inactive charge depletion of said implantable medical device; and
determining a time period until an end of service of an energy storage device associated with said implantable medical device based upon said active charge depletion and said inactive charge depletion. - View Dependent Claims (1, 2, 3, 4, 5, 6, 55, 56, 57, 58, 59, 60, 61, 62, 63)
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61-1. The computer readable program storage device of claim 62, further comprising calibrating said inactive current usage rate for a previous inactive period.
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62-2. The computer readable program storage device of claim 54, further comprising generating an end of service signal based upon a determination that said time period until said end of service equals zero.
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64. The computer readable program storage device of claim 65, wherein said predetermined period is six months.
Specification