Plastic device for preventing entry of water into the outer auditory canal of an ear incorporates a sound channel which a has an open inner end and an outer end closed by a membranes

摘要

A plastic device for preventing entry of water into the outer auditory canal of an ear incorporates a sound channel (2) which a has an open inner end and an outer end closed by a membranes (M1, M2) forming a part of a sound reception wall (3).