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Implantable wireless accoustic stimulators with high energy conversion efficiencies

  • US 10,052,493 B2
  • Filed: 04/25/2016
  • Issued: 08/21/2018
  • Est. Priority Date: 03/25/2008
  • Status: Active Grant
First Claim
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1. An implantable receiver-stimulator for harvesting acoustic power from an acoustic field and generating electrical power, comprising:

  • a sealed enclosure with an inner and outer surface;

    a first plurality of acoustic piezoelectric components which converts the acoustic field to electrical power, each piezoelectric component defined by a thickness and a base with a width and configured with the base mounted to the inner surface;

    a plurality of individual rectifiers, where each rectifier is electrically connected to a corresponding piezoelectric component of the first plurality of piezoelectric components such that the electrical power from the piezoelectric components is converted by the rectifiers arranged in a circuit assembly to a biologically stimulating electrical output; and

    at least two stimulation electrodes which receive the stimulating electrical output and deliver said output to tissue at sufficient electrical energy levels to stimulate the tissue;

    wherein the acoustic piezoelectric components are distributed about the inner surface facing multiple directions such that the acoustic power is harvested efficiently from any direction of the propagating acoustic field; and

    wherein at least part of the inner surface is configured as a circuit.

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