Patent ID: 8630436

Claim:
An ear unit for stably fitting in an ear having an antihelix, a crus of helix, a tragus and a concha surrounded by the antihelix, comprising: a first surface facing inwardly toward the concha of the ear; a second, opposite surface facing outwardly from the concha of the ear; and an outer circumferential surface and an opposite, inner circumferential surface formed between the first and second surfaces, wherein: said outer circumferential surface is shaped as a decremental curve that curves in a first direction, in that said decremental curve corresponds to the antihelix of the ear with a surface shaped in such a way that the decremental curve falls along the inner part of the antihelix and is partly positioned under the antitragus, the distance between the ends of the decremental curve is approximately equal to the distance between a first cavity formed under the tragus of the ear and second cavity covered by the lower node of the antihelix of the ear, the upper part of the curve projecting in underneath a flap covering the lower part of the second cavity, and said first surface includes a contact surface that substantially conforms to the concha, said contact surface including a curved portion curving in a second direction substantially orthogonal to the first direction, providing an improved attachment, thereby enabling the ear unit to fit closely against the concha when the ear unit is positioned into the ear, and wherein the curved portion extends radially an entire distance from the inner circumferential surface to the outer circumferential surface, and is aligned with an extension of the crus of helix when the ear unit is positioned in the ear.