Patent ID: 6592930
Filing Date: 2003-07-15
Classification: A61M

Abstract:
A method for controlling transfer of electrically charged particles of a medication powder, intended for inhalation, emitted from a particle generator to a defined target area of a substrate member in a dose forming process, comprising the steps ofarranging a particle transfer electrode member forming an electric iris diaphragm such that at least one electrode, being a part of said iris diaphragm with its associated electric field, operates to transfer charged particles emitted from said particle generator, to said defined target area of said substrate member, controlling the direction and speed of the particles, in the dose forming process, the charged particles being produced by one of corona-charging, tribo-charging, and induction charging; locating said electric iris diaphragm between said particle generator and said substrate member such that all particles must pass the iris diaphragm in order to be transferred to the substrate member, the iris diaphragm being operable as a shutter.