| 摘要 |
An inhaler comprising a reservoir of inhalable composition, an outlet valve to control the flow of composition from the reservoir, the valve outlet orifice having a maximum dimension h, measured in the direction of opening when fully opened; an expansion chamber downstream of the valve having a length L and diameter D measured half way along the expansion chamber; and an exit orifice at the downstream end of the expansion chamber, the orifice having a length l and a diameter d; wherein 0.1<h/d<1.0; 0.05<h/D<0.25; 1<D/d<10; 5<L/D<15; 0.1<l/d<5. |
