Managing recharge power for implantable medical devices
First Claim
1. A method comprising:
- calculating, by a processor, an estimated cumulative thermal dose delivered to a patient during charging of a rechargeable power source of an implantable medical device over a period of time;
selecting, by the processor, a power level for subsequent charging of the rechargeable power source based on the estimated cumulative thermal dose; and
charging the rechargeable power source with the selected power level.
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Accused Products
Abstract
Devices, systems, and techniques for controlling charging power based on a cumulative thermal dose to a patient are disclosed. Implantable medical devices may include a rechargeable power source that can be transcutaneously charged. An external charging device may calculate an estimated cumulative thermal dose delivered to the patient during charging over a predetermined period of time. Based on the estimated cumulative thermal dose, the external charging device may select a power level for subsequent charging of the rechargeable power source. In one example, the charging device may select a high power level when the cumulative thermal dose has not exceeded a thermal dose threshold and select a low power level when the cumulative thermal dose has exceeded the thermal dose threshold.
42 Citations
29 Claims
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1. A method comprising:
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calculating, by a processor, an estimated cumulative thermal dose delivered to a patient during charging of a rechargeable power source of an implantable medical device over a period of time; selecting, by the processor, a power level for subsequent charging of the rechargeable power source based on the estimated cumulative thermal dose; and charging the rechargeable power source with the selected power level. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A device comprising:
a processor configured to; calculate an estimated cumulative thermal dose delivered to a patient during charging of a rechargeable power source of an implantable medical device over a period of time; select a power level for subsequent charging of the rechargeable power source based on the estimated cumulative thermal dose; initiate a lockout period after the rechargeable power source is charged with a high power level; control a charging module to prevent selection of the high power level during the lockout period; and allow selection of a low power level during the lockout period, wherein a duration of the lockout period is based on a previous charging time with the high power level. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. A computer-readable storage medium comprising instructions that cause at least one processor to:
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calculate an estimated cumulative thermal dose delivered to a patient during charging of a rechargeable power source of an implantable medical device over a period of time; and select a power level for subsequent charging of the rechargeable power source based on the estimated cumulative thermal dose; and charge the rechargeable power source with the selected power level. - View Dependent Claims (23)
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24. A system comprising:
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an implantable medical device comprising a rechargeable power source and a secondary coil coupled to the rechargeable power source; an external charging device comprising; a charging module configured to charge the rechargeable power source; and a primary coil; and at least one processor configured to calculate an estimated cumulative thermal dose delivered to a patient during charging of the rechargeable power source over a period of time and select a power level for subsequent charging of the rechargeable power source based on the estimated cumulative thermal dose, wherein the charging module is configured to generate a first electrical current in the primary coil based on the selected power level, and wherein the primary coil induces an electrical current in the secondary coil of the implantable medical device used to charge the rechargeable power source. - View Dependent Claims (25, 26, 27, 28)
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29. A method comprising:
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calculating, by a processor, an estimated cumulative thermal dose delivered to a patient during charging of a rechargeable power source of an implantable medical device over a period of time; selecting, by the processor, a power level for subsequent charging of the rechargeable power source based on the estimated cumulative thermal dose; initiating a lockout period after charging the rechargeable power source with a high power level; and controlling a charging module to prevent selection of the high power level during the lockout period and allow selection of a low power level during the lockout period, wherein a duration of the lockout period is based on a previous charging time with the high power level.
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Specification