US Patent 9038630 Delivery devices

A delivery device for delivering a metered amount of substance, the delivery device comprising: a mouthpiece (17) through which a user in use exhales; an outlet (19) through which substance is in use delivered; a housing (21) fluidly connected to the mouthpiece and the outlet, such, that exhalation by the user through the mouthpiece creates an air flow through the housing and from the outlet; and a substance-dispensing unit (25) which is disposed within the housing and operative to dispense a metered amount of substance into an entraining air flow as created through the housing.