Abstract: The present invention provides a new inhaler device for the storage and/or administration of inhalable liquids to a patient offering one or more advantages or improvements over known inhalers, particularly inhalers for the delivery of halogenated volatile liquids such as methoxyflurane for use as an analgesic.

Abstract: The present invention provides a new inhaler device for the administration of inhalable liquids to a patient offering one or more advantages or improvements over known inhalers, particularly inhalers for the delivery of halogenated volatile liquids such as methoxyflurane for use as an analgesic.

Abstract: A spacer comprising a polycarbonate chamber and a flow valve located within the chamber. The chamber comprises: a first reservoir and a second reservoir; an inlet for admission of aerosolized medication into the first reservoir; an outlet for withdrawal of medication from the second reservoir; and a vent for expulsion of air from the second reservoir. The flow valve is adapted to: allow forward-flow of medication from the first reservoir to the second reservoir during user inspiration; substantially limit inflow of air through the vent into the second reservoir during user inspiration, substantially limit backflow of air or medication from the second reservoir to the first reservoir during user expiration; and allow expulsion of air from the second reservoir through the vent during user expiration.