#$%^&*AU2011201528B220120705.pdf#####ABSTRACT A medical dispenser, comprises a powder-containing cavity and a flow passage comprising s a flat surface region located both upstream and downstream of the cavity. The flat surface region comprises an opening into said cavity, the opening being defined by a rim, wherein the flat surface region lies in the plane coinciding with the rim or in a plane parallel with the plane coinciding with the rim. An obstacle is provided in the flow passage upstream of the cavity causing an airflow to pass round the obstacle. 10
