Andersen Blank Stage
To achieve an even distribution of a dose from an OINDP on a filter for dissolution testing 1, a blank stage is introduced next to the filter stage on the Andersen impactor. The blank stage (lower part in the picture) fits to the ordinary Andersen stage (upper part in the picture).
1. Sitaram P. Velagaa, Jelena Djuris, Sandra Cvijic, Stavroula Rozou, Paola Russo, Gaia Colombo Alessandra Rossi; European Journal of Pharmaceutical Sciences, ISSN: 0928-0987, Vol: 113, Page: 18-28