Patent ID: 8893716

Claim:
A disposable breathing assistance device comprising: a conduit having a distal end and a proximal end and a main channel extending therebetween, said distal end of said conduit either adapted to be engaged directly with a patient's breathing tract or adapted to be engaged indirectly with a patient's breathing tract, said proximal end of said conduit in fluid communication with the ambient atmosphere; a side port, said side port adapted to be supplied with supplementary respirable gas by a respirable gas source and for injecting supplementary respirable gas into an interior of said conduit; a manometer affixed to the conduit and in fluid communication with the interior of said conduit; a supplementary respirable gas distribution ring adapted to be supplied with the supplementary respirable gas from the side port, the distribution ring adapted to supply the supplementary respirable gas to one or more of supplementary respirable gas inlets, the one or more of supplementary respirable gas inlets delivering the supplementary respirable gas into the main channel; wherein each of the one or more of supplementary respirable gas inlets has a substantially rectangular cross section and the cross-sectional height of each of the one or more of supplementary respirable gas inlets has a first height at an end of the of the supplementary respirable gas inlets closest to the side port and a height of each of the one or more of supplementary respirable gas inlets linearly increases towards the main channel.