Abstract
Purpose
Aerosol particle deposition in the human nasal cavity is of high interest in particular for intranasal central nervous system (CNS) drug delivery via the olfactory cleft. The objective of this study was the development and comparison of a numerical and experimental model to investigate various parameters for olfactory particle deposition within the complex anatomical nasal geometry.
Methods
Based on a standardized nasal cavity, a computational fluid and particle dynamics (CFPD) model was developed that enables the variation and optimization of different parameters, which were validated by in vitro experiments using a constructed rapid-prototyped human nose model.
Results
For various flow rates (5 to 40 l/min) and particle sizes (1 to 10 μm), the airflow velocities, the calculated particle airflow patterns and the particle deposition correlated very well with the experiment. Particle deposition was investigated numerically by varying particle sizes at constant flow rate and vice versa assuming the particle size distribution of the used nebulizer.
Conclusions
The developed CFPD model could be directly translated to the in vitro results. Hence, it can be applied for parameter screening and will contribute to the improvement of aerosol particle deposition at the olfactory cleft for CNS drug delivery in particular for biopharmaceuticals.
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Abbreviations
- BBB:
-
Blood–brain barrier
- CAD:
-
Computer-aided design
- CFPD:
-
Computational fluid and particle dynamics
- CNS:
-
Central nervous system
- CT:
-
Computed tomography
- DNS:
-
Direct Numerical Simulations
- IP:
-
Impaction parameter
- LES:
-
Large Eddy Simulations
- MMAD:
-
Mass median aerodynamic diameter
- NALT:
-
Nasopharynx-associated lymphoid tissue
- RANS:
-
Reynolds-averaged Navier–Stokes
- WHO:
-
World Health Organization
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ACKNOWLEDGMENTS AND DISCLOSURES
This study was supported by Ulm and Biberach joint graduate school in pharmaceutical biotechnology funded by the Baden-Württemberg State Ministry of Science, Research and Arts. Special thanks go to Dr. Andreas Lintermann for his helpful support and valuable scientific comments on the manuscript.
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Lucas Engelhardt and Martina Röhm contributed equally to the manuscript and share first authorship.
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Engelhardt, L., Röhm, M., Mavoungou, C. et al. First Steps to Develop and Validate a CFPD Model in Order to Support the Design of Nose-to-Brain Delivered Biopharmaceuticals. Pharm Res 33, 1337–1350 (2016). https://doi.org/10.1007/s11095-016-1875-7
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DOI: https://doi.org/10.1007/s11095-016-1875-7