Method and apparatus for protecting the passengers of an airplane against hypoxia
US7082946B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 31, 2002 |
| Grant date | Aug 1, 2006 |
| Priority date | — |
| Expiry date | Oct 31, 2022 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA62B7/14
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
In order to protect the passengers of an airplane against the effects of depressurization of the cabin, breathing masks are fed with oxygen at a rate which is an increasing function of cabin altitude. Oxygen is fed via a constriction and an economizer bag, and an initial fraction only of the gases breathed out is caused to be re-breathed by collecting the initial fraction in a flexible re-breathing bag in communication with the mask. The re-breathing bag has a volume in inflated state which is not less than the total dead volume of the respiratory tract and the mask. A protective apparatus comprises a feed control unit supplying an adjustable flow rate to masks connected to a general pipe via respective economizer bags. A re-breathing bag retards re-breathing and stores only an initial fraction of the gases breathed out on each exhalation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.