DISPENSING APPARATUS

摘要

A dispensing apparatus (1) defines an outlet (3) through which a metered dose of liquid (19) from a reservoir (16) is dispersed as an atomised spray. A droplet (19) of liquid is metered onto a perforate membrane (6) which is vibrated by means of a piezoelectric transducer (10) such that atomised droplets are dispensed through the holes (7) formed in the membrane. At each actuation of a delivery means (14) which provides the metered quantity of liquid, the transducer is actuated so as to vibrate the membrane for a period greater than the dispensing period required for the droplet to be dispensed. The apparatus is particularly suitable for dispensing pharmaceutical preparations.