Efficient dynamic stimulation in an implanted device
First Claim
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1. Apparatus for stimulating tissue having a capacitance, comprising:
- charge circuitry which is adapted to apply a stimulation current to the tissue, causing a voltage to develop across the capacitance of the tissue; and
discharge circuitry which is adapted to inject a discharge current to the tissue so as to discharge the capacitance, such that, while the discharge current is being injected into the tissue, a value of the discharge current is substantially independent of the voltage across the capacitance,the discharge circuitry being adapted to measure the voltage across the capacitance, and to halt injection of the discharge current to the tissue when the voltage is substantially zero.
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Abstract
A method for measuring impedance of a tissue (20), consisting of charging a capacitor (C15) to a potential, and discharging the capacitor for a discharge period through the tissue. The method further consists of measuring a voltage drop on the capacitor over the discharge period and determining the impedance of the tissue responsive to the potential, the voltage drop, and the discharge period.
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Citations
16 Claims
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1. Apparatus for stimulating tissue having a capacitance, comprising:
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charge circuitry which is adapted to apply a stimulation current to the tissue, causing a voltage to develop across the capacitance of the tissue; and discharge circuitry which is adapted to inject a discharge current to the tissue so as to discharge the capacitance, such that, while the discharge current is being injected into the tissue, a value of the discharge current is substantially independent of the voltage across the capacitance, the discharge circuitry being adapted to measure the voltage across the capacitance, and to halt injection of the discharge current to the tissue when the voltage is substantially zero. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for stimulating tissue having a capacitance, comprising:
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applying a stimulation current to the tissue so as to cause a voltage to develop across the capacitance of the tissue; injecting a discharge current to the tissue so as to discharge the capacitance, such that, while the discharge current is being injected into the tissue, a value of the discharge current is substantially independent of the voltage across the capacitance; measuring the voltage across the capacitance; and halting injection of the discharge current to the tissue when the voltage is substantially zero. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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Specification