US Patent 8406447 Earphone device with ear canal protrusion

An earphone device (1) comprising a main body (14) to be inserted in to the outer ear (28) of a user. The main body (14) has a first side (5) that faces the user's head when inserted, a cavity (13) and a sound opening (2) connecting the first side (5) with the cavity (13). The main body (14) further comprises an ear canal protrusion (3) to be inserted into the ear canal (7). The cross section of the ear canal protrusion (3) is smaller than the cross section of the ear canal (7) and the ear canal protrusion (3) is having a first side (8) adapted to lie against the ear canal wall (10) and a second side (9) lying opposite the first side (8) and beside the sound opening (2).