Patent ID: 8910629

Claim:
A delivery device for providing an active substance and an uptake enhancing gas, which acts to increase the uptake of the active substance, to the nasal airway of a subject, the delivery device comprising: a nosepiece for fitting to one nostril of the subject; a mouthpiece through which the subject in use exhales and which is fluidly connected to the nosepiece; a substance supply unit which is fluidly connected to the nosepiece and operative to supply active substance as one of an aerosol spray or powder; and a scrubber 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 and provide a gas flow to the nosepiece which has an increased concentration of at least one other, uptake enhancing gas which acts to increase the uptake of the active substance as delivered by the substance supply unit.