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Method of readout of implanted hearing aid device and apparatus therefor

  • US 5,024,224 A
  • Filed: 09/01/1988
  • Issued: 06/18/1991
  • Est. Priority Date: 09/01/1988
  • Status: Expired due to Term
First Claim
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1. A method of conveying signals from a hearing aid with an implanted device having an impedance to a device located external to the body of the implant wearer and inductively coupled to said implanted device, the improvement comprising:

  • modulating the impedance of said implanted device in accordance with a first signal to be conveyed;

    using said externally located device to deliver energy to said implanted device in amounts which vary in accordance with the modulated impedance of said implanted device;

    using said externally located device to ascertain the amounts of energy delivered to said implanted device, said amounts of energy being indicative of the modulated impedance of said implanted device;

    from said ascertained amounts of energy delivered using said externally located device to ascertain said first signal, whereby said first signal is conveyed from said implanted device to said externally located device;

    wherein said first device includes a rectification means switchable between modes of half wave and full wave rectification and wherein said modulating step is performed by using said first signal to cause said rectification means to switch between said modes.

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