Implantable transducer devices
First Claim
Patent Images
1. An implantable receiver-stimulator device comprising:
- a transducer assembly which receives acoustic energy from an acoustic transmitter and produces electrical energy in response to the acoustic energy, wherein the electrical energy is characterized by a source impedance;
circuitry which receives the electrical energy and produces a biologically stimulating electrical output; and
at least two tissue contacting electrodes which receive the stimulating electrical output and deliver electrical energy to tissue, characterized by a tissue load impedance, wherein the source impedance and the tissue load impedance are matched.
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Abstract
Receiver-stimulators comprise a nearly isotropic transducer assembly, demodulator circuitry, and at least two tissue contacting electrodes. Use of near isotropic transducers allows the devices to be implanted with less concern regarding the orientation relative to an acoustic energy source. Transducers or transducer elements having relatively small sizes, typically less than ½ the wavelength of the acoustic source, enhance isotropy. The use of single crystal piezoelectric materials enhance sensitivity.
250 Citations
18 Claims
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1. An implantable receiver-stimulator device comprising:
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a transducer assembly which receives acoustic energy from an acoustic transmitter and produces electrical energy in response to the acoustic energy, wherein the electrical energy is characterized by a source impedance; circuitry which receives the electrical energy and produces a biologically stimulating electrical output; and at least two tissue contacting electrodes which receive the stimulating electrical output and deliver electrical energy to tissue, characterized by a tissue load impedance, wherein the source impedance and the tissue load impedance are matched. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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Specification