Selectable boost converter and charge pump for compliance voltage generation in an implantable stimulator device
First Claim
1. A medical device, comprising:
- at least one electrode configured to stimulate a patient'"'"'s tissue;
a charge pump circuit configured to produce a compliance voltage from a first voltage when enabled;
a boost converter circuit configured to produce the compliance voltage from the first voltage when enabled, wherein the charge pump circuit and the boost converter circuit are connected in parallel between the first voltage and the compliance voltage; and
current generation circuitry configured to receive the compliance voltage and configured to produce a stimulation current to the at least one electrode.
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Abstract
Compliance voltage generation circuitry for a medical device is disclosed. The circuitry in one embodiment comprises a boost converter and a charge pump, either of which is capable of generating an appropriate compliance voltage from the voltage of the battery in the device. A boost signal from compliance voltage monitor-and-adjust logic circuitry is processed with a telemetry enable signal to selectively enable either the charge pump or the boost converter: if the telemetry enable signal is not active, the boost converter is used to generate the compliance voltage; if the telemetry enable signal is active, the charge pump is used. Because the charge pump circuitry does not produce a magnetic field, the charge pump will not interfere with magnetically-coupled telemetry between the implant and an external controller. By contrast, the boost converter is allowed to operate during periods of no telemetry, when magnetic interference is not a concern.
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Citations
15 Claims
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1. A medical device, comprising:
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at least one electrode configured to stimulate a patient'"'"'s tissue; a charge pump circuit configured to produce a compliance voltage from a first voltage when enabled; a boost converter circuit configured to produce the compliance voltage from the first voltage when enabled, wherein the charge pump circuit and the boost converter circuit are connected in parallel between the first voltage and the compliance voltage; and current generation circuitry configured to receive the compliance voltage and configured to produce a stimulation current to the at least one electrode. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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Specification