Patent ID: 8151793

Claim:
An inhalation device for enabling deaggregation of a medicament powder during dispensing of the medicament powder, the device comprising: an inlet port end for receiving an intake of air; a mouthpiece for delivering the medicament powder to a user; a cavity containing the medicament powder; and a flow passage including a flat surface region having an opening into the cavity_and a top surface located generally opposite the flat surface region and extending generally from upstream of the opening to downstream of the opening, wherein the top surface is substantially free of any protrusion extending into the flow passage and an air stream passing between the top surface and the flat surface region and substantially outside the cavity will generate a cylindrical eddy in the cavity, such that the generated cylindrical eddy contributes to deaggregation of the medicament powder in the cavity and emptying of the medicament powder from the cavity, wherein the cavity has a substantially straight first edge on the flat surface region and a substantially straight second edge on the flat surface region and the flow passage has opposing side surfaces extending along sides of the opening, at least part of the opposing side surfaces extending along sides of the opening being arranged in a diverging relationship such that the flow passage broadens in the direction of the air stream.