Rechargeable-Battery Implantable Medical Device Having a Primary Battery Active During a Rechargeable-Battery Undervoltage Condition
First Claim
1. An implantable medical device, comprising:
- a first battery for providing a first battery voltage;
a second battery for providing a second battery voltage;
a first load powered only by the first battery voltage;
a second load powered by a power supply voltage; and
a power supply selector configured to set the power supply voltage to the first battery voltage or the second battery voltage in accordance with at least the first battery voltage.
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Abstract
A rechargeable-battery Implantable Medical Device (IMD) is disclosed including a primary battery which can be used as a back up to power critical loads in the IMD when the rechargeable battery is undervoltage and other non-critical loads are thus decoupled from the rechargeable battery. A rechargeable battery undervoltage detector provides at least one rechargeable battery undervoltage control signal to a power supply selector, which is used to set the power supply for the critical loads either to the rechargeable battery voltage when the rechargeable battery is not undervoltage, or to the primary battery voltage when the rechargeable battery is undervoltage. Circuitry for detecting the rechargeable battery undervoltage condition may be included as part of the critical loads, and so the undervoltage control signal(s) is reliably generated in a manner to additionally decouple the rechargeable battery from the load to prevent further rechargeable battery depletion.
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Citations
19 Claims
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1. An implantable medical device, comprising:
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a first battery for providing a first battery voltage; a second battery for providing a second battery voltage; a first load powered only by the first battery voltage; a second load powered by a power supply voltage; and a power supply selector configured to set the power supply voltage to the first battery voltage or the second battery voltage in accordance with at least the first battery voltage. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. An implantable medical device, comprising:
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a first battery for providing a first battery voltage; a second battery for providing a second battery voltage; a first battery voltage detector configured to determine whether the first battery is undervoltage; a first load; and a second load, wherein if the first battery is not undervoltage, the first load is powered by the first battery voltage, and the second load is powered by the first battery voltage, and wherein if the first battery is undervoltage, the first load is not powered, and the second load is powered by the second battery voltage or the first battery voltage. - View Dependent Claims (17)
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18. An implantable medical device, comprising:
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a first battery for providing a first battery voltage; a second battery for providing a second battery voltage; a first battery voltage detector configured to compare the first battery voltage to a first threshold, and to produce at least one first control signal indicative of the comparison; at least one switch configured to selectively couple the first battery voltage to a first load in accordance with the at least one first control signal; and a power supply selector configured to set a power supply voltage to the first battery voltage or the second battery voltage in accordance with at least the at least one first control signal, wherein the power supply voltage powers a second load. - View Dependent Claims (19)
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Specification