Implantable microphone with shaped chamber

An implantable microphone, comprising:

• a housing;
• a diaphragm sealably positioned across and spaced from a recessed surface of the housing, wherein said recessed surface and said diaphragm collectively define a chamber therebetween and wherein said diaphragm defines a reference plane;
• and
• 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,
• wherein a perpendicular distance between said reference plane and said recessed surface, over at least a portion of a width of said recessed surface, increases as a function of a horizontal distance from a peripheral edge of said recessed surface,
• wherein a diameter of said recessed surface is less than 30 mm.

An implantable microphone, comprising:

• a chamber at least in part established by a diaphragm and a surface that is recessed from the diaphragm;
• and
• a pressure sensitive apparatus configured to generate an output signal indicative of a pressure fluctuation sensed thereby, wherein
• a geometric center of a location of pressure communication between the pressure sensitive apparatus is offset from a geometric center of the chamber.