A wax guard system, for use with an in-the-ear hearing aid, has a housing secured to the hearing aid shell and an insert which screws into the housing. The insert has a body having an internal passage therethrough, and a bridge extending across the exterior opening of the passage. The bridge is higher...http://www.google.com/patents/US5278360?utm_source=gb-gplus-sharePatent US5278360 - Hearing aid wax guard with integral bridge
