Patent ID: 6868853

Claim:
An electro-dose of a medical powder for use in a dry powder inhaler, the electro-dose having been prepared from an active powder substance or a dry powder medical formulation presenting a fine particle fraction (FPF) of the order 50% or more of its content having a particle size from 0.5 to 5 μm, said substance or formulation having been metered onto a device constituting a dose carrier, thereby having formed said electro-dose into a chosen state of dose porosity, the electro-dose further meeting electric specifications regarding absolute specific charge per mass after charging of the order 0.1 to 25 μC/g and presenting a charge decay rate constant Q 50 of more than 0.1 sec with a tap density of less than 0.8 g/ml and a water activity a w of less than 0.5.