Patent ID: 7246617
Filing Date: 2007-07-24
Classification: A61M

Abstract:
1. An inhaler comprising: a chamber having a mouthpiece; a cyclone configured as a substantially cylindrical cavity provided with a tangential inlet and an axial outlet arranged to eject an aerosol of medicament into the chamber, said cylindrical cavity having a diameter between about 4 and 10 mm; a drug dosing device arranged to provide a dose of powdered medicament entrained in an airflow to the cyclone; and a piston pump for providing the airflow of repeatable volume and velocity to the drug dosing device, the piston pump comprising a plunger received in a pump cylinder and a spring so that air is drawn into the cylinder when the plunger is withdrawn therefrom against the bias of the spring; and a breath-actuated mechanism which retains the plunger in a retracted position against the biasing force of the spring until the medicament is to be delivered.