Patent ID: 7240765
Filing Date: 2007-07-10
Classification: A61F,B33Y,H04R

Abstract:
1. A hearing protection earplug, comprising a hard shell having an elasticity of from shore D 85 to shore D 65 and having an outer surface individually shaped according to a measured inner shape of a user's outer ear and ear canal for being worn at least in part in said user's ear canal, said shell comprising a filter cavity having at least one orifice into which a passive acoustic filter element is inserted for forming, together with said orifice, a passive acoustic filter; wherein said passive acoustic filter element and said at least one orifice having said filter element inserted therein comprise means for detachably fixing said filter element within said orifice; and wherein said means for detachably fixing said filter element within said at least one orifice are bayonet means adapted to fix said filter element by a combination of a rotary and an axial movement of said filter element relative to said orifice.