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 rechargeable battery for providing a rechargeable battery voltage;
a primary battery for providing a primary battery voltage;
a first load powered only by the rechargeable 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 rechargeable battery voltage or the primary battery voltage in accordance with at least the rechargeable battery voltage.
1 Assignment
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Accused Products
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
41 Claims
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1. An implantable medical device, comprising:
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a rechargeable battery for providing a rechargeable battery voltage; a primary battery for providing a primary battery voltage; a first load powered only by the rechargeable 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 rechargeable battery voltage or the primary battery voltage in accordance with at least the rechargeable battery voltage. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. An implantable medical device, comprising:
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a rechargeable battery for providing a rechargeable battery voltage; a primary battery for providing a primary battery voltage; a rechargeable battery voltage detector configured to determine whether the rechargeable battery is undervoltage; a first load; and a second load, wherein if the rechargeable battery is not undervoltage, the first load is powered by the rechargeable battery voltage, and the second load is powered by the rechargeable battery voltage, and wherein if the rechargeable battery is undervoltage, the first load is not powered, and the second load is powered by the primary battery voltage or the rechargeable battery voltage. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
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28. An implantable medical device, comprising:
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a rechargeable battery for providing a rechargeable battery voltage; a primary battery for providing a primary battery voltage; a rechargeable battery voltage detector configured to compare the rechargeable 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 rechargeable 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 rechargeable battery voltage or the primary 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 (29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41)
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Specification