Patent ID: 6422991
Filing Date: 2002-07-23
Classification: H04R

Abstract:
An implantable microphone device, comprising:a housing defining a surface and a rear chamber; a diaphragm coupled to the housing, the diaphragm being a substantially unstressed diaphragm and being disposed over the surface of the housing to define a primary cavity therebetween; a device through which a gas can be removed from or introduced into the rear chamber; a microphone arrangement on the housing, the microphone arrangement having an aperture open to the primary cavity, an internal cavity coupled to the primary cavity through the aperture so that vibrations of the diaphragm are transmitted through the primary cavity and aperture into the internal cavity, and a vent connecting the cavity to the rear chamber; and a microphone transducer disposed in the cavity of the microphone arrangement so as to detect said transmitted vibrations.