CAPACITY FADE ADJUSTED CHARGE LEVEL OR RECHARGE INTERVAL OF A RECHARGEABLE POWER SOURCE OF AN IMPLANTABLE MEDICAL DEVICE, SYSTEM AND METHOD
First Claim
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1. A system, comprising:
- an implantable medical device having a rechargeable power source having a voltage and a total charge capacity of said rechargeable power source, which said total charge capacity changes over time; and
electronic componentry, operatively coupled to said implantable medical device, configured to;
determine a first state of charge at a first time by measuring said voltage at said first time;
determine a second state of charge at a second time by measuring said voltage at said second time, said second time being later than said first time;
determine a net charge passed through said rechargeable power source between said first time and said second time; and
determine said total charge capacity by at least dividing said net charge by the difference between said second state of charge and said first state of charge.
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Abstract
System and method for estimating the time before recharging the rechargeable power source of an implantable medical device. In a method, the present charge level of the power source is determined by determining the percentage of total charge consumed over a period of time. The present charge level is then divided by the expected power use to determine time remaining before recharging. Another method utilizes a model to determine the faded capacity of the rechargeable power source based on the number of times the rechargeable power source has been charged and the duration of the rechargeable power source'"'"'s life.
52 Citations
28 Claims
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1. A system, comprising:
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an implantable medical device having a rechargeable power source having a voltage and a total charge capacity of said rechargeable power source, which said total charge capacity changes over time; and electronic componentry, operatively coupled to said implantable medical device, configured to; determine a first state of charge at a first time by measuring said voltage at said first time; determine a second state of charge at a second time by measuring said voltage at said second time, said second time being later than said first time; determine a net charge passed through said rechargeable power source between said first time and said second time; and determine said total charge capacity by at least dividing said net charge by the difference between said second state of charge and said first state of charge. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A system, comprising:
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an implantable medical device having a rechargeable power source having recharge interval until a time when recharge of said rechargeable power source is desired, said rechargeable power source having a voltage, a total charge capacity which changes over time and a charge level; electronic componentry, operatively coupled to said implantable medical device, configured to; record a cycle age by counting a number of recharges of said rechargeable power source indicative of a number of times said rechargeable power source has been recharged; record a chronological age of said rechargeable power source; determine said total charge capacity of said rechargeable power source at a first time by subtracting a charge capacity based, at least in part, on said cycle age of said rechargeable power source and a charge capacity based, at least in part, on said chronological age of said rechargeable power source from said total charge capacity at a second time, said second time being earlier than said first time; measure a voltage of said rechargeable power source; determine a state of charge as a function of said voltage; determine a charge level of said rechargeable power source as a function of said total charge capacity at said first time and said state of charge; and determine said recharge interval as a function of said charge level and a programmed rate; and a user output, operatively coupled to said electrical componentry, configured to communicate said recharge interval to said user. - View Dependent Claims (12, 13, 14, 15)
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16. A system, comprising:
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an implantable medical device having a rechargeable power source, said rechargeable power source having total charge capacity; electronic componentry, operatively coupled to said implantable medical device, configured to; record a cycle age by counting a number of recharges of said rechargeable power source indicative of a number of times said rechargeable power source has been recharged; record a chronological age of said rechargeable power source; determine said total charge capacity of said rechargeable power source at a first time by subtracting a charge capacity based on said cycle age of said rechargeable power source and a charge capacity based on said chronological age of said rechargeable power source from said total charge capacity at a second time, said second time being earlier than said first time; and a user output, operatively coupled to said electronic componentry, configured to communicate said total charge capacity at said first time. - View Dependent Claims (17)
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18. In an implantable medical device having a rechargeable power source, a method for determining a present charge capacity of said rechargeable power source, said rechargeable power source having a charge level, a total charge capacity and a voltage, comprising the steps of:
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determining a first portion of charge remaining at a first time by measuring said voltage at said first time; determining a second portion of charge remaining at a second time by measuring said voltage at said second time, said second time being later than said first time; determining a charge consumed by said implantable medical device between said first time and said second time; determining said total charge capacity by at least dividing said charge consumed by the difference between said second portion and said first portion; and storing a value indicative, at least in part, of said total charge capacity. - View Dependent Claims (19, 20, 21, 22)
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23. In an implantable medical device having a rechargeable power source, a method for determining a recharge interval until a time when recharge of said rechargeable power source is desired, said rechargeable power source having a total charge capacity and a charge level, comprising the steps of:
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recording a cycle age by counting a number of recharges of said rechargeable power source indicative of a number of times said rechargeable power source has been recharged; recording a chronological age of said rechargeable power source; determining said total charge capacity of said rechargeable power source at a first time by subtracting a charge capacity based, at least in part, on said cycle age of said rechargeable power source and a charge capacity based, at least in part, on said chronological age of said rechargeable power source from said total charge capacity at a second time, said second time being earlier than said first time; measuring a voltage of said rechargeable power source; determining a portion of said present charge capacity as a function of said rechargeable voltage; determining said charge level as a function of said total charge capacity at said first time and said portion of charge capacity remaining; determining said recharge interval as a function of said total charge level at said first time and a programmed rate; and outputting said recharge interval to a user. - View Dependent Claims (24, 25, 26)
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27. In an implantable medical device having a rechargeable power source, a method for determining a present charge capacity of said rechargeable power source, said rechargeable power source having a total charge capacity, comprising the steps of:
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recording a cycle age by counting a number of recharges of said rechargeable power source indicative of a number of times said rechargeable power source has been recharged; recording a chronological age of said rechargeable power source; determining said total charge capacity of said rechargeable power source at a first time as a function of subtracting a charge capacity based on said cycle age of said rechargeable power source and a charge capacity based on said chronological age of said rechargeable power source from said total charge capacity at a second time, said second time being earlier than said first time; outputting said total charge capacity at said first time and said total charge capacity at said second time to a user. - View Dependent Claims (28)
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Specification