Patent ID: 7293559

Claim:
A method comprising the steps of: feeding a pharmaceutically active drug through a cylindrical channel of a feeding source in a manner which causes the liquid to be expelled from an exit opening as a liquid stream wherein the exit opening has a diameter in a range of from about 0.002 mm to about 2 mm; forcing a gas through a pressure chamber in a manner which causes the gas to exit the pressure chamber from an exit orifice having a diameter in a range of about 0.002 mm to about 2 mm, the gas exiting downstream of a flow path of the liquid stream expelled from the exit opening of the feeding source; wherein the exit opening of the feeding source is separated by a distance of from about 0.002 mm to about 2 mm from the exit opening of the feeding source; wherein the liquid is forced through the channel at a rate in a range of about 0.01 nl/sec to about 100 microliters/sec.