A device and method to protect a user's ear from changes in external atmospheric pressure and to treat middle ear disease by actively controlling (increasing, decreasing, oscillating or preserving unchanged) air pressure in the user's outer ear cavity. Preferably pressure is controlled using an earplug...http://www.google.es/patents/US20020069883?utm_source=gb-gplus-sharePatente US20020069883 - Device for active regulation of pressure on outer ear
Device for active regulation of pressure on outer ear
