DETERMINATION OF STIMULATION OUTPUT CAPABILITIES THROUGHOUT POWER SOURCE VOLTAGE RANGE
First Claim
1. A method comprising:
- determining a length of time a charge pump charged at a present voltage level of a power source to reach a level of charge on the charge pump sufficient to provide a stimulation output according to a stimulation program;
determining a total time interval available for the charge pump to charge during delivery of stimulation according to the stimulation program; and
determining whether the medical device will be able to deliver stimulation according to the program at a voltage level of the power source that is lower than the present voltage level of the power source based on the length of time the charge pump charged at the present voltage level of the power source and the total time interval available for the charge pump to charge.
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Abstract
Techniques for determining whether a medical device will be able to deliver stimulation according to a particular program throughout a useable voltage range of a power source of the medical device are described. According to some examples, the medical device charges a charge pump to a level sufficient to provide a stimulation output according to a stimulation program, determines a length of time that the charge pump charges at the present power source voltage level, and determines a time between stimulation pulses of the stimulation program. Whether the medical device will be able to deliver stimulation according to the program when the power source is at a power source voltage level lower than the present voltage level is determined based on the length of time the charge pump charges at the present voltage level of the power source and the time between stimulation pulses.
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Citations
32 Claims
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1. A method comprising:
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determining a length of time a charge pump charged at a present voltage level of a power source to reach a level of charge on the charge pump sufficient to provide a stimulation output according to a stimulation program; determining a total time interval available for the charge pump to charge during delivery of stimulation according to the stimulation program; and determining whether the medical device will be able to deliver stimulation according to the program at a voltage level of the power source that is lower than the present voltage level of the power source based on the length of time the charge pump charged at the present voltage level of the power source and the total time interval available for the charge pump to charge. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A medical device system comprising:
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a medical device comprising; a power source at a present power source voltage level, and a signal generator that generates electrical stimulation, wherein the signal generator comprises a charge pump coupled to the power source; and a processor that determines a length of time that the charge pump charged at the present power source voltage level to reach a level of charge on the charge pump sufficient to provide a stimulation output according to a stimulation program, determines a total time interval available for the charge pump to charge during delivery of stimulation according to the stimulation program, and determines whether the medical device will be able to deliver stimulation according to the program at a voltage level of the power source that is lower than the present voltage level of the power source based on the length of time the charge pump charged at the present voltage level of the power source and the total time interval available for the charge pump to charge. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31)
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32. A medical device system comprising:
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means for determining a length of time a charge pump charged at a present voltage level of a power source to reach a level of charge on the charge pump sufficient to provide a stimulation output according to a stimulation program; means for determining a total time interval available for the charge pump to charge; and means for determining whether the medical device will be able to deliver stimulation according to the program at a power source voltage level lower than a present voltage level of a power source based on the length of time the charge pump charges at the present voltage level of the power source and the total time interval available for the charge pump to charge.
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Specification