Power architecture for an implantable medical device having a non-rechargeable battery
First Claim
1. Circuitry for an implantable medical device, comprising:
- a non-rechargeable battery outputting a battery voltage;
boosting circuitry for boosting the battery voltage to a boosted voltage;
a threshold voltage set to a constant value;
comparator circuitry configured to determine if the battery voltage is greater than or equal to the threshold voltage and configured to determine if the battery voltage is less than the threshold voltage;
first circuitry powered by the battery voltage when the comparator circuitry determines that the battery voltage is greater than or equal to the threshold voltage, and by the boosted voltage when the comparator circuitry determines that the battery voltage is less than the threshold voltage;
second circuitry comprising a DC-DC converter, wherein the second circuitry is only powered by the battery voltage; and
at least one Digital-to-Analog converter, wherein the DC-DC converter produces a compliance voltage to power the at least one Digital-to-Analog converter, wherein the Digital-to-Analog converter is configured to provide current to at least one electrode for contacting a patient'"'"'s tissue.
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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.
48 Citations
18 Claims
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1. Circuitry for an implantable medical device, comprising:
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a non-rechargeable battery outputting a battery voltage; boosting circuitry for boosting the battery voltage to a boosted voltage; a threshold voltage set to a constant value; comparator circuitry configured to determine if the battery voltage is greater than or equal to the threshold voltage and configured to determine if the battery voltage is less than the threshold voltage; first circuitry powered by the battery voltage when the comparator circuitry determines that the battery voltage is greater than or equal to the threshold voltage, and by the boosted voltage when the comparator circuitry determines that the battery voltage is less than the threshold voltage; second circuitry comprising a DC-DC converter, wherein the second circuitry is only powered by the battery voltage; and at least one Digital-to-Analog converter, wherein the DC-DC converter produces a compliance voltage to power the at least one Digital-to-Analog converter, wherein the Digital-to-Analog converter is configured to provide current to at least one electrode for contacting a patient'"'"'s tissue. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. Circuitry for an implantable medical device, comprising:
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a non-rechargeable battery outputting a battery voltage; boosting circuitry having an input and an output, the boosting circuitry for converting a voltage at the input to a higher voltage at the output; first circuitry comprising a first input power supply, wherein the first input power supply is connected to the output of the boosting circuitry; a threshold voltage set to a constant value; comparator circuitry configured to determine if the battery voltage is greater than or equal to the threshold voltage and configured to determine if the battery voltage is less than the threshold voltage; a switch, wherein the switch is controllable by the comparator circuitry to route the battery voltage to the first input power supply when the battery voltage is greater than or equal to the threshold voltage, and to route the battery voltage to the input of the boosting circuitry when the battery voltage is less than the threshold voltage; and second circuitry comprising a second input power supply, wherein the second input power supply is connected to the battery voltage. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18)
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Specification