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Wideband low-noise implantable microphone assembly

  • US 20030125602A1
  • Filed: 12/20/2002
  • Published: 07/03/2003
  • Est. Priority Date: 01/02/2002
  • Status: Active Grant
First Claim
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1. An implantable microphone assembly comprising:

  • an hermetically sealed case, the hermetically sealed case having a posterior wall, an anterior wall, and side walls that surround and enclose a pressurized space within the hermetically sealed case;

    a diaphragm having a perimeter portion and a central portion, wherein the perimeter portion of the diaphragm is hermetically mounted to the outside of the anterior wall of the hermetically sealed case, and wherein a central gap exists between the central portion of the diaphragm and the anterior wall;

    an acoustic channel having a first end that opens into the central gap at a location that is near the center of the diaphragm, and a second end that opens to the pressurized space inside the hermetically sealed case at a location that is near the perimeter of the diaphragm; and

    an acoustic transducer mounted to the anterior wall within the pressurized space at the second end of the acoustic channel, the acoustic transducer including means for converting sensed pressure variations to an electrical signal, and wherein deflections of the central portion of the diaphragm create pressure variations in the gap and acoustic channel that are sensed by the acoustic transducer;

    whereby the acoustic transducer produces an electrical signal representative of external pressure variations that deflect the diaphragm.

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