Design and evaluation of a new dry powder inhaler

Three versions of a new dry powder inhaler (DPI), RG-haler, were designed using two kinds of grid inserts. Salbutamol sulfate/lactose blend (Ventolin Rotacaps ) was selected as a model formulation to analyze the performance of all inhalers and compare their efficiency with three marketed devices (Rotahaler , Spinhaler and ISF inhalator ) using the twin impinger (TI). Deposition of the drug in device was significantly (P<0.05) lower for ISF inhalator and all kinds of RG-halers in comparison with those of Rotahaler and Spinhaler . The amount of drug deposited in the stage 2 and the respirable dose for RG-halers were similar to those of ISF inhalator and significantly (P<0.05) higher than those of Rotahaler and Spinhaler . The results suggest efficient aerosol generating capability of the RG-haler.