Implant current controlled battery charging based on temperature
First Claim
1. A method for wirelessly charging a battery in an implantable medical device, the method comprising the steps of:
- providing a receiver in the implantable medical device;
providing a temperature sensor in the implantable medical device;
receiving, via the receiver, a wireless power signal from an external charger;
converting the wireless power signal into a battery charge signal including power for recharging the battery;
sensing a temperature of the implantable medical device with the temperature sensor; and
changing a current of the battery charge signal from a first non-zero current to a second non-zero current that is different from the first non-zero current, wherein said changing of the current of the battery charge signal is based on the temperature sensed by the temperature sensor.
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Abstract
A method for wirelessly charging a battery in an implantable medical device including the steps of: providing a receiver in the implantable medical device and providing a temperature sensor in the implantable medical device. The method also includes receiving, via the receiver, a wireless power signal from an external charger and converting the wireless power signal into a battery charge signal including power for recharging the battery. The method yet also includes sensing a temperature of the implantable medical device with the temperature sensor. The method further includes changing a current of the battery charge signal from a first non-zero current to a second non-zero current that is different from the first non-zero current. Changing of the current of the battery charge signal is based on the temperature sensed by the temperature sensor.
81 Citations
20 Claims
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1. A method for wirelessly charging a battery in an implantable medical device, the method comprising the steps of:
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providing a receiver in the implantable medical device; providing a temperature sensor in the implantable medical device; receiving, via the receiver, a wireless power signal from an external charger; converting the wireless power signal into a battery charge signal including power for recharging the battery; sensing a temperature of the implantable medical device with the temperature sensor; and changing a current of the battery charge signal from a first non-zero current to a second non-zero current that is different from the first non-zero current, wherein said changing of the current of the battery charge signal is based on the temperature sensed by the temperature sensor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method for wirelessly charging a battery in an implantable medical device, the method comprising the steps of:
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providing a receiver in the implantable medical device; providing a temperature sensor in the implantable medical device; receiving, via the receiver, a wireless power signal from an external charger; converting the wireless power signal into a battery charge signal including power for recharging the battery; sensing temperature information of the implantable medical device with the temperature sensor; and controlling a current of the battery charge signal based on the temperature information sensed by the temperature sensor, such that when the temperature is less than a low temperature threshold the battery charge signal is provided at a first non-zero current, and when the temperature is greater than a high temperature threshold the battery charge signal is provided at a second non-zero current that is less than the first non-zero current.
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17. A method for wirelessly charging a battery in an implantable medical device, the method comprising the steps of:
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providing a receiver in the implantable medical device; providing a temperature sensor in the implantable medical device; receiving, via the receiver, a wireless power signal from an external charger; converting the wireless power signal into a battery charge signal including power for recharging the battery; sensing temperature information of the implantable medical device with the temperature sensor; obtaining historical temperature information based on the temperature information sensed by the temperature sensor over a period of time; and using a charge controller for selecting a current of the battery charge signal, using a control algorithm, based on the temperature information and historical temperature information, such that, the temperature is prevented from exceeding a charging temperature threshold. - View Dependent Claims (18)
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19. A method for wirelessly charging a battery in an implantable medical device, the method comprising the steps of:
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providing a receiver in the implantable medical device; providing a temperature sensor in the implantable medical device; receiving, via the receiver, a wireless power signal from an external charger; converting the wireless power signal into a battery charge signal including power for recharging the battery; sensing a temperature of the implantable medical device with the temperature sensor; controlling a current of the battery charge signal to maintain the temperature at a target temperature; calculating an effective charge current of the battery charge signal based on the target temperature, the temperature, and historical temperature information of the implantable medical device to prevent the temperature from exceeding a temperature threshold while maintaining a high battery charge rate; and switching the current of the battery charge signal between at least two different discrete non-zero currents during a time interval based on the targeted temperature, such that a time weighted average of the at least two different discrete non-zero currents during the time interval is equal to the effective charge current.
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20. A method of providing a neurostimulation therapy to a patient, comprising the steps of:
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providing an implantable medical device having a battery that recharging and being implanted in a patient; using said implantable medical device for driving at least one electrode implanted in the patient to stimulate at least one nerve of the patient; and wirelessly charging the battery in the implantable medical device, said wireless charging including the steps of; providing a receiver in the implantable medical device; providing a temperature sensor in the implantable medical device; receiving, via the receiver, a wireless power signal from an external charger; converting the wireless power signal into a battery charge signal including power for recharging the battery; sensing a temperature of the implantable medical device with the temperature sensor; and changing a current of the battery charge signal from a first non-zero current to a second non-zero current that is different from the first non-zero current, wherein said changing of the current of the battery charge signal is based on the temperature sensed by the temperature sensor.
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Specification