Importance

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Abstract

An electro-dose constitutes a metered medical powder and is formed from an electro-powder constituting an active powder substance or a dry powder medical formulation being transferred onto a device member forming a dose carrier. The electro-dose prepared from an electro-powder presents a fine particle fraction (FPF) having of the order 50% or more of its content with a particle size between 0.5-5 .mu.m. The electro-powder of such a metered electro-dose further provides electrostatic properties regarding absolute specific charge per mass after charging of the order 0.1 to 25 .mu.C/g and presents a charge decay rate constant Q.sub.50 of more than 0.1 sec with a tap density of less than 0.8 g/ml and a water activity a.sub.w of less than 0.5. The electro-dose porosity is adjusted to obtain an optimized porosity value in percent of 75 to 99.9 calculated as 100-100.times.(Density.sub.electro-dose /Density.sub.electro-powder).

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First Claim