Patent ID: 8474456
Filing Date: 2013-07-02
Classification: A62B,B64D

Abstract:
1. An oxygen breathing mask, comprising: (i) an oxygen mask body defining an interior space with a first opening adapted to communicate with mouth and/or nose of a person to be supplied with oxygen, (ii) an oxygen bag defining an interior space coupled to an oxygen supply line, (iii) an oxygen supply channel connecting the interior space of the oxygen mask body to the oxygen bag, (iv) an oxygen supply valve arranged to allow or to stop flow of oxygen through the oxygen supply channel, (v) an expiration channel connecting the interior space of the oxygen mask body to ambient space (vi) an expiration valve cooperating with the expiration channel and arranged to allow or to stop flow of expiration air through the expiration channel, (vii) an ambient air inlet channel connecting the interior space of the oxygen mask body to ambient space, (viii) an ambient air inlet valve cooperating with the ambient air inlet channel and arranged to allow or to stop flow of inspiration air through the ambient air inlet channel, said ambient air inlet valve being arranged parallel to said oxygen supply valve such that air delivered through the oxygen supply channel does not pass the ambient air inlet valve, (ix) wherein the oxygen supply valve is adapted to be open if p (x) wherein the ambient air inlet valve is adapted to be open if p (xii) wherein the expiration valve is adapted to be open if p wherein the oxygen supply valve comprises an oxygen inlet valve body provided in the oxygen supply channel and a membrane separating the oxygen supply channel from ambient pressure, wherein said membrane is coupled to an engaging member, the engaging member moving an oxygen inlet valve body into the closed position if the membrane is in a position where p b −p m ≦p 1 in order to deliver ambient air only.