Pulse-by-Pulse Compliance Voltage Generation for an Implantable Stimulator
First Claim
1. Circuitry configured to adjust a compliance voltage in an implantable stimulator device, comprising:
- a current generator configured to provide a current pulse to at least one electrode;
a minimum determining circuit configured to determine a minimum value of a voltage across the current generator that occurs during a duration of the current pulse; and
regulator circuitry configured to adjust the compliance voltage that powers the current generator, wherein the regulator circuitry is controlled by a control signal derived from the minimum value.
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Accused Products
Abstract
Circuitry for generating a compliance voltage (V+) for the current sources and/or sinks in an implantable stimulator device in disclosed. The circuitry assesses whether V+ is optimal for a given pulse, and if not, adjusts V+ for the next pulse. The circuitry uses amplifiers to measure the voltage drop across active PDACs (current sources) and NDAC (current sinks) at an appropriate time during the pulse. The measured voltages are assessed to determine whether they are high or low relative to optimal values. If low, a V+ regulator is controlled to increase V+ for the next pulse; if not, the V+ regulator is controlled to decrease V+ for the next pulse. Through this approach, gradual changes that may be occurring in the implant environment can be accounted for, with V+ adjusted on a pulse-by-pulse basis to keep the voltage drops at or near optimal levels for efficient DAC operation.
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18 Claims
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1. Circuitry configured to adjust a compliance voltage in an implantable stimulator device, comprising:
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a current generator configured to provide a current pulse to at least one electrode; a minimum determining circuit configured to determine a minimum value of a voltage across the current generator that occurs during a duration of the current pulse; and regulator circuitry configured to adjust the compliance voltage that powers the current generator, wherein the regulator circuitry is controlled by a control signal derived from the minimum value. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. Circuitry configured to adjust a compliance voltage in an implantable stimulator device, comprising:
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a source circuit coupled to a compliance voltage, wherein the source circuit is configured to provide a first current pulse to at least a first electrode; a sink circuit coupled to a reference voltage, wherein the sink circuit is configured to sink the first current pulse from at least a second electrode; first minimum determining circuitry configured determine a minimum first value of a first voltage across the source circuit that occurs during a duration of the first current pulse; second minimum determining circuitry configured determine a minimum second value of a second voltage across the sink circuit that occurs during the duration of the first current pulse; and regulator circuitry configured to adjust the compliance voltage, wherein the regulator circuitry is controlled by a control signal derived from the minimum first value and the minimum second value. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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Specification