DRY POWDER INHALATION SYSTEM FOR TRANSPULMONARY ADMINISTRATION

摘要

The present invention provides a novel dry powder inhalation system suitable for transpulmonary administration. The dry powder inhalation system of the invention characterized by using a combination of: (1) a vessel housing a freeze-dried composition that contains a single dose of an active ingredient, and has: (i) a non-powder cake-like form, (ii) a disintegration index of 0.015 or more, and (iii) a property of becoming fine particles having a mean particle diameter of 10 microns or less or a fine particle fraction of 10% or more upon receipt of an air impact having an air speed of at least 1 m/sec and an air flow rate of at least 17 ml/sec; and (2) a device comprising means capable of applying said air impact to the freeze-dried composition in said vessel, and means for discharging the powder-form freeze-dried composition that has been made into fine particles.