Inhalation devices with a reduced risk of blockage

摘要

An aerosol inhalation device, having a mouthpiece (12) and a canister (15) of pressurized hygroscopic medicament, the canister (15) being fitted at one end with a dispensing metering valve; wherein a protective barrier (19) is provided between the dispensing metering valve and the mouthpiece (12) so as to eliminate or substantially reduce blockage of the device.