Power architecture for an implantable medical device having a non-rechargeable battery
First Claim
1. Circuitry for an implantable medical device, comprising:
- an electrode configured to pass a therapeutic current through a patient'"'"'s tissue;
a non-rechargeable battery outputting a battery voltage;
a telemetry coil;
boosting circuitry configured to boost the battery voltage to a boosted voltage at an output of the boosting circuitry;
first circuitry powered only by the boosting circuitry output; and
second circuitry powered by and directly connected to the battery voltage, wherein the second circuitry comprises;
a DC-DC converter configured to produce a compliance voltage for powering a digital-to-analog converter configured to produce the therapeutic current; and
tank circuitry coupled to the telemetry coil configured to communicate data wirelessly with an external device.
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Accused Products
Abstract
An improved architecture for an implantable medical device using a primary battery is disclosed which reduces the need for boosting the voltage of the primary battery, and hence reduces the power draw in the implant. The architecture includes a boost converter for boosting the voltage of the primary battery and for supplying that boosted voltage to certain of the circuit blocks, which is particularly useful if the battery voltage is necessarily lower than the minimal input power supply voltage necessary for the circuit blocks to operate. However, 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, thus saving power.
33 Citations
19 Claims
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1. Circuitry for an implantable medical device, comprising:
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an electrode configured to pass a therapeutic current through a patient'"'"'s tissue; a non-rechargeable battery outputting a battery voltage; a telemetry coil; boosting circuitry configured to boost the battery voltage to a boosted voltage at an output of the boosting circuitry; first circuitry powered only by the boosting circuitry output; and second circuitry powered by and directly connected to the battery voltage, wherein the second circuitry comprises; a DC-DC converter configured to produce a compliance voltage for powering a digital-to-analog converter configured to produce the therapeutic current; and tank circuitry coupled to the telemetry coil configured to communicate data wirelessly with an external device. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. Circuitry for an implantable medical device, comprising:
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an electrode configured to pass a therapeutic current through a patient'"'"'s tissue; a non-rechargeable battery outputting a battery voltage; a telemetry coil; boosting circuitry configured to boost the battery voltage to a boosted voltage at an output of the boosting circuitry; first circuitry, wherein the first circuitry comprises a plurality of regulators powered only by the boosting circuitry output and each configured to produce a power supply voltage for a circuit element in the implantable medical device; and second circuitry powered by and directly connected to the battery voltage, wherein the second circuitry comprises; a DC-DC converter configured to produce a compliance voltage for powering a digital-to-analog converter configured to produce the therapeutic current; and tank circuitry coupled to the telemetry coil configured to communicate data wirelessly with an external device. - View Dependent Claims (15, 16, 17, 18, 19)
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Specification