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Aerosols in the Health Care Field


:: Section 4

DPI (Dry Powder Inhaler)

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A DPI is a metered-dosing system initiated by breath, that is, the patient generates the aerosol by drawing air through a dose of drug powder. Unlike SVNs, no propellants are needed and hand-breath is not required. However, the powder needs to be dispersed into respirable particles and that will required the generation of a turbulent flow in the inhaler.  Hence, the ability to inhale the powder with a high inspiratory flow rate is very critical in using the DPI, i.e., the DPI requires a high inspiratory flow rate.

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