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This white paper presents 12-month results from a multi-center prospective study on the patency of maxillary sinus ostia following dilation with a novel osmotic expansion device. The study was designed to evaluate basic usability and confirm expected safety and effectiveness of the Vent-Os Sinus Dilation System—developed by the SinuSys Corporation—when used to dilate maxillary sinus ostia in patients with CRS. Unlike balloon dilation devices that use rapid, high-pressure inflation, the Vent-Os Sinus Dilation System is a small, low-pressure, self-expanding insert designed to gently and gradually open the sinus ostia. These results were presented at the 2014 Annual Meeting of the American Rhinologic Society.