Aerosol-forming porous membrane with certain pore structure

A disposable package for use in aerosolized delivery of drugs to the lung, comprising:

• a container having at least one wall which is collapsible by the application of a force and having at least one opening;
• and
• a nozzle covering the opening of the container, wherein the nozzle is comprised of a sheet of material comprising a membrane having a nozzle area which area has a plurality of pores therein,
• wherein the pores have a diameter in the range of about 0.5 to 50 microns and further wherein the pores are surrounded by an elevated area.

A disposable package for use in aerosolized delivery of material to lungs, comprising:

• a container having at least one wall which is collapsible by the application of force and having at least one opening, wherein the container has therein a liquid, flowable formulation;
• and
• a membrane covering the opening wherein the membrane comprises a plurality of substantially circular weakened areas having an unflexed diameter in a range of about 0.5 to about 5.0 microns which weakened areas burst when pressure is applied while the remainder of the membrane remains unbroken,
• wherein the pores are individually surrounded by an elevated area.