Aerosol delivery system with perforate membrane

An aerosol delivery system comprising:

• a perforate membrane comprising a plurality of apertures;
• a fluid reservoir comprising an opening in fluid communication with a first side of the perforate membrane;
• and
• actuation means configured to vibrate the perforate membrane to cause a liquid in the fluid reservoir during use to pass through at least some of the plurality of apertures and to be ejected as liquid droplets from a second side of the perforate membrane,
• wherein the plurality of apertures comprises a first array of apertures of a first configuration and a second array of apertures of a second configuration which is different to the first configuration, wherein the first array of apertures are grouped together in a first discrete region of the perforate membrane, and wherein the second array of apertures are grouped together in a second discrete region of the perforate membrane, and
• wherein the fluid reservoir comprises:
• a first reservoir portion configured to supply a first liquid to the first discrete region;
• a second reservoir portion configured to supply a second liquid to the second discrete region, wherein the perforate membrane is a single perforate membrane extending across the opening such that the first array of apertures of the single perforate membrane is in fluid communication with the first reservoir portion and the second array of apertures of the single perforate membrane is in fluid communication with the second reservoir portion;
• and
• at least one liquid barrier configured to separate the first and second reservoir portions, wherein the at least one liquid barrier comprises a flexible seal in contact with the first side of the perforate membrane to separate the first and second reservoir portions and the first and second arrays such that the first liquid is delivered to the first array of apertures separately of the second liquid delivered to the second array of apertures.