Disposable noise reducing hearing aid attachment

Claim 1

A disposable noise reducing hearing aid attachment for attaching to a hearing aid that has a housing with a sound inlet formed therein of a specified cross-sectional area to transmit audible sound from the environment to an internal microphone, comprising: a flexible noise filter layer of an open cellular material for overlying the sound inlet to reduce the amplitude of audible noise transmitted from the environment to the hearing aid sound inlet; said noise filter layer having extended top and bottom surfaces of greater area than the cross-sectional area of the sound inlet to form a central area region for directly overlying the sound inlet and a circumferential perimeter region for extending outward of the sound inlet; a flexible wind and dust screen layer of tightly woven fabric coextensive with and engaging the top surface of the noise filter layer; a stretchable bottom ring layer of sheet material having a central aperture of a cross-sectional area greater than the cross-sectional area of the sound inlet engaging the perimeter region of the bottom surface of the noise filter layer; said screen layer and said stretchable ring layer being permanently secured to the perimeter regions of the respective top and bottom surfaces of the noise filter layer by rings of adhesive with the central area regions of the noise filter surfaces being free of adhesive; said ring layer having a bottom surface with a coating of pressure sensitive adhesive thereon to enable the attachment to be releasably mounted to the hearing aid housing over the sound inlet.