Many embodiments of an airway assembly and methods of using an airway assembly are disclosed. In one embodiment, an airway assembly includes an outer tube, an inner tube disposed coaxially with the outer tube, and a seal disposed on the inner tube. The seal is movable between a collapsed position and an expanded position where the seal engages an airway. Another embodiment is an airway assembly that includes an outer tube having a proximal portion and a distal portion, and an inner tube disposed coaxially with the outer tube. The inner tube has a proximal portion and a distal portion. The proximal portion of the outer tube has an outer diameter that is larger than an outer diameter of the distal portion of the outer tube.