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Use of Airway Replicas in Lung Delivery Applications.

The use of extrathoracic airway replicas in optimization of drug delivery to the lungs with nebulizers, dry powder inhalers (DPIs) and pressurized metered-dose inhalers (pMDIs) is discussed. Such airway replicas have been useful in evaluating new pulmonary drug delivery platforms mainly based on the comparison of the total lung dose (TLD) and the aerodynamic particle size distribution (APSD) of the aerosol distal to the physical models. The ability of these in vitro methods to replicate in vivo results has allowed advancements in respiratory drug delivery and in the accuracy and utility of in vitro-in vivo correlations (IVIVCs).