Ear wax barrier for a hearing aid
US4870689A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 31, 1988 |
| Grant date | Sep 26, 1989 |
| Priority date | — |
| Expiry date | Mar 31, 2008 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R25/654
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An ear wax barrier for a hearing aid to prevent ear wax from contacting and damaging the internal components of a hearing aid or hearing aid receiver. The barrier includes a housing defining a central axis of passage, as well as a plurality of projections and a variable acoustic attenuator. The projections extend inwardly from the interior surface of the housing, each projection partially occluding the cross-sectional area of the housing. The projection provides a tortuous path for ear wax migrating into the hearing aid. The variable acoustic attenuator and the projections provide a constricted passageway for damping of the acoustic response of the hearing aid.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.