| abstract |
A delivery device for providing therapeutic gas to the nasal airway of a subject, the delivery device comprising: a nosepiece ( 21 ) for fitting to one nostril of the subject; a mouthpiece ( 23 ) through which the subject in use exhales and which is fluidly connected to the nosepiece ( 21 ); and a scrubber ( 27 ) which is operative at least to reduce the concentration of at least one gas from an exhaled breath of the subject as delivered through the mouthpiece ( 23 ) and provide a gas flow to the nosepiece ( 21 ) which has an increased concentration of at least one other,” therapeutic gas which provides a therapeutic effect. |