A metered dose inhaler (10) for use with a pressurized aerosol canister (18) includes a housing (12) defining a conduit (16) with a mouthpiece (56), and an actuator (26) with a nozzle discharge orifice (30) arranged to discharge aerosol into the conduit. An air tube (34) is arranged within the conduit...http://www.google.com/patents/US5954047?utm_source=gb-gplus-sharePatent US5954047 - Methods and apparatus for delivering aerosolized medication
