Patent ID: 7489793
Filing Date: 2009-02-10
Classification: H04R

Abstract:
1. An implantable microphone, comprising: a housing; a diaphragm sealably positioned across a recessed surface of the housing, wherein said recessed surface and said diaphragm collectively define a chamber and wherein said diaphragm defines a reference plane; a pressure sensitive element operatively interconnected to said chamber for detecting pressure fluctuations and generating an output signal, said output signal being operative to actuate an actuator of a hearing instrument; and wherein a depth of said recessed surfaces varies relative to said reference plane across at least a portion of a width of said recessed surface and wherein said chamber has a first volume when said diaphragm is in a static non-deflected position and wherein said chamber has a second volume when said diaphragm is deflected in response to a predetermined pressure differential, and wherein a ratio of said second volume divided by said first volume is less than 0.4.