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In-canal hearing aid

  • US 4,539,440 A
  • Filed: 05/16/1983
  • Issued: 09/03/1985
  • Est. Priority Date: 05/16/1983
  • Status: Expired due to Fees
First Claim
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1. An in-canal hearing aid adapted to fit within the auditory canal of a wearer comprisinga generally cylindrical member including a resilient stretchable outer layer for contacting the walls of the auditory canal, and an adjustably expandable member disposed within said outer layer for changing the diameter of said outer layer without significantly changing the length of the cylindrical member;

  • hearing aid amplifying means disposed within said generally cylindrical member and including power source means, audio amplifier means, an input audio transducer disposed at one end of said generally cylindrical member and coupled to an input of said audio amplifier means, an output audio transducer disposed at the other end of said generally cylindrical member and coupled to an output of said audio amplifier means, and means for adjusting the gain of said audio amplifier means; and

    adjusting means extending from the one end of said generally cylindrical member for selectively expanding said adjustably expandable member such that the generally cylindrical member fits snugly in the wearer'"'"'s auditory canal;

    said generally cylindrical member being flexibly hinged to permit axial flexing, such that the hearing aid can accommodate the curvature of the auditory canal.

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