Efficiently delivering acoustic stimulation energy to tissue
First Claim
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1. A method for driving an implanted acoustically powered receiver-stimulator having at least one tissue-engaging electrode with a tissue-electrode impedance, said method comprising:
- directing an acoustic transmission towards the implanted receiver-stimulator, said transmission having an envelope selected to compensate for the tissue-electrode impedance; and
wherein directing the acoustic transmission is generated by supplying voltage to an acoustic transmitter amplifier and controlling the supplied voltage to produce an acoustic transmission having a pre-selected envelope, and wherein the supplied voltage is controlled by selecting the capacitance of an energy storage capacitor in a transmitter voltage power supply circuit.
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Abstract
A system for delivering an electrical stimulation pulse to tissue comprises a controller-transmitter and a receiver-stimulator. The controller-transmitter includes circuitry having an energy storage capacitor. The capacitance of the energy storage capacitor is adjusted to improve the efficiency of energy delivered from the receiver-stimulator to tissue by modifying the geometry of an acoustic drive burst from the controller-transmitter.
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Citations
13 Claims
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1. A method for driving an implanted acoustically powered receiver-stimulator having at least one tissue-engaging electrode with a tissue-electrode impedance, said method comprising:
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directing an acoustic transmission towards the implanted receiver-stimulator, said transmission having an envelope selected to compensate for the tissue-electrode impedance; and wherein directing the acoustic transmission is generated by supplying voltage to an acoustic transmitter amplifier and controlling the supplied voltage to produce an acoustic transmission having a pre-selected envelope, and wherein the supplied voltage is controlled by selecting the capacitance of an energy storage capacitor in a transmitter voltage power supply circuit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 9)
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8. A method for driving an implanted acoustically powered receiver-stimulator having at least one tissue-engaging electrode with a tissue-electrode impedance, said method comprising:
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directing an acoustic transmission towards the implanted receiver-stimulator, said transmission having an envelope selected to compensate for the tissue-electrode impedance; and wherein said transmission has an exponentially decreasing amplitude, wherein the amplitude has an initial and final value and wherein the final amplitude of the transmission is from 40% to 60% of the initial amplitude. - View Dependent Claims (10, 11, 12, 13)
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Specification