Spacing device for releasing active substances in the paranasal sinus

摘要

A spacing device for use in fenestrations of the paranasal sinus, the device including a sheath which forms a hollow body defining at least two apertures. The sheath includes at least one layer loaded with an active substance. The ratio q of the external diameter r_a of the hollow body to the internal diameter r_i of the hollow body is about 1.2 to 3.0.