Multi surface acoustic nebuliser

A nebuliser for nebulising liquid droplets, including:

• a housing;
• a piezoelectric substrate accommodated within the housing, the piezoelectric substrate having:
• a transducer surface upon which is located at least one electroacoustic transducer for generating acoustic wave energy within the piezoelectric substrate, and
• an opposing non-transducer surface;
• and
• a liquid supply system for supplying a liquid to at least one of the group consisting of the transducer surface and the non-transducer surface, the liquid supply system including a reservoir for accommodating the liquid, and at least one supply conduit for supplying the liquid from the reservoir to the piezoelectric substrate, the at least one supply conduit arranged to be in contact with the liquid on the piezoelectric substrate during supply,
• wherein the liquid supply system is configured to prime the supply of liquid such that the supply of liquid to the piezoelectric substrate is regulated by acoustic wave energy generated within the piezoelectric substrate pulling liquid from the liquid supply system and does not comprise a wick in contact with the piezoelectric substrate.