Power architecture for an implantable medical device having a non-rechargeable battery
First Claim
1. An implantable medical device, comprising:
- at least one electrode configured to provide stimulation to a patient'"'"'s tissue;
a battery configured to output a battery voltage;
a first converter circuit configured to boost the battery voltage to a first boosted voltage;
threshold circuitry configured to determine if the battery voltage is greater than or equal to a predetermined threshold voltage, and configured to determine if the battery voltage is less than the predetermined threshold voltage;
first circuitry powered by the battery voltage when the threshold circuitry determines that the battery voltage is greater than or equal to the predetermined threshold voltage, and by the boosted voltage when the threshold circuitry determines that the battery voltage is less than the predetermined threshold voltage;
a second converter circuit configured to boost the battery voltage to a second boosted voltage; and
at least one Digital-to-Analog converter configured to provide current to the at least one electrode, wherein the at least one Digital-to-Analog converter is powered only by the second boosted voltage.
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Accused Products
Abstract
An improved architecture for an implantable medical device using a primary battery is disclosed which reduces the circumstances in which the voltage of the primary battery is boosted, and hence reduces the power draw in the implant. The architecture includes a boost converter for selectively boosting the voltage of the primary battery and for supplying that boosted voltage to certain of the circuit blocks, including digital circuitry, analog circuitry, and memory. However, the boost converter is only used to boost the battery voltage when its magnitude is below a threshold; if above the threshold, the battery voltage is passed to the circuit blocks without boosting. Additionally, some circuitry capable of operation even at low battery voltages—including the telemetry tank circuitry and the compliance voltage generator—receives the battery voltage directly without boosting, and without regard to the current magnitude of the battery voltage.
21 Citations
20 Claims
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1. An implantable medical device, comprising:
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at least one electrode configured to provide stimulation to a patient'"'"'s tissue; a battery configured to output a battery voltage; a first converter circuit configured to boost the battery voltage to a first boosted voltage; threshold circuitry configured to determine if the battery voltage is greater than or equal to a predetermined threshold voltage, and configured to determine if the battery voltage is less than the predetermined threshold voltage; first circuitry powered by the battery voltage when the threshold circuitry determines that the battery voltage is greater than or equal to the predetermined threshold voltage, and by the boosted voltage when the threshold circuitry determines that the battery voltage is less than the predetermined threshold voltage; a second converter circuit configured to boost the battery voltage to a second boosted voltage; and at least one Digital-to-Analog converter configured to provide current to the at least one electrode, wherein the at least one Digital-to-Analog converter is powered only by the second boosted voltage. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. An implantable medical device, comprising:
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at least one electrode configured to provide stimulation to a patient'"'"'s tissue; a battery configured to output a battery voltage; a first converter circuit configured to boost the battery voltage to a first boosted voltage; threshold circuitry configured to determine if the battery voltage is greater than or equal to a predetermined threshold voltage, and configured to determine if the battery voltage is less than the predetermined threshold voltage; first circuitry powered by the battery voltage when the threshold circuitry determines that the battery voltage is greater than or equal to the predetermined threshold voltage, and by the boosted voltage when the threshold circuitry determines that the battery voltage is less than the predetermined threshold voltage; a second converter circuit configured to boost the battery voltage to a second boosted voltage; and at least one third converter circuit configured to provide a stimulation current to the at least one electrode, wherein the at least one third converter circuit is powered by only the second boosted voltage. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
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Specification