| 摘要 |
PROBLEM TO BE SOLVED: To provide a dry powder inhaler which solves such the problem that conventional dry powder inhalers are susceptible to moisture which can affect both a fine particle fraction and delivered dose consistency. SOLUTION: The dry powder inhaler comprises a main airflow path 4 including a cyclone chamber 16 having an air inlet 2 and being so shaped that at least a part of the chamber decreases in cross-sectional area in a direction away from the air inlet. Thus, when used, a reverse flow cyclone is formed in the chamber. A bypass airflow path 8 bypasses the cyclone chamber, and the main and bypass airflow paths communicate with a mouthpiece 6. The cyclone chamber may be provided by a member 22 which is removable from the rest of the inhaler for regular replacement thereof. COPYRIGHT: (C)2011,JPO&INPIT |
