However, during descent if the Eustachian tube does not open fully the middle ear remains at a relatively low pressure relative to the pressure in the cabin which increases above the ambient pressure once the aeroplane has descended below (7,000-8,000 feet.
Generally during take-off and the main part of the flight the pressure in the middle ear has an opportunity to equalise relative to the cabin pressure gradually. In pressurised aircraft, for example passenger aircraft, which cruise at altitudes typically from 30,000-35,000 feet, the cabin is pressurised to an equivalent of an altitude of 7,000-8,000 feet. When the Eustachian tube A is blocked, for example through congestion due to a head cold, the pressure in the middle ear can differ to that in the outer ear. When the ear is working normally, the Eustachian tube A which connects the middle ear B to the back of the nose (not shown), equalises the pressure between the middle ear B and the outer ear C.
Fig.l shows a schematic sectional view of the auditory system. The ear pain primarily results from a pressure difference between the outer and middle ear. Many passengers feel discomfort or pain in their ears when flying, particularly during the descent of the aircraft. A61M31/00- Devices for introducing or retaining media, e.g.A61M- DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR.catamenial tampons Accessories therefor characterised by the material or the structure of the inner absorbing core catamenial tampons Accessories therefor characterised by the shape catamenial tampons Accessories therefor characterised by the use specially adapted for the ear cavity catamenial tampons Accessories therefor characterised by the use sanitary towels, swabs or tampons for external or internal application to the body Supporting or fastening means therefor Tampon applicators A61F13/00- Bandages or dressings Absorbent pads.A61F11/08- Protective devices for the ears internal, e.g.A61F11/06- Protective devices for the ears.A61F11/00- Methods or devices for treatment of the ears or hearing sense Non-electric hearing aids Methods or devices for enabling ear patients to achieve auditory perception through physiological senses other than hearing sense Protective devices for the ears, carried on the body or in the hand.STENTS ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES FOMENTATION TREATMENT OR PROTECTION OF EYES OR EARS BANDAGES, DRESSINGS OR ABSORBENT PADS FIRST-AID KITS A61F- FILTERS IMPLANTABLE INTO BLOOD VESSELS PROSTHESES DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g.A61- MEDICAL OR VETERINARY SCIENCE HYGIENE.Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.) Filing date Publication date Priority claimed from GB0800893.0 external-priority Application filed by Aerbuddies Ltd filed Critical Aerbuddies Ltd Publication of WO2009090396A1 publication Critical patent/WO2009090396A1/en Links Inventor Ian Bailey Robert Morse Original Assignee Aerbuddies Ltd Priority date (The priority date is an assumption and is not a legal conclusion. Google Patents WO2009090396A1 - An ear protection device WO2009090396A1 - An ear protection device
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