The patented SalterLabs Flex-Tip Tracheal Tube has a soft, flexible, curved, centred, distal tip that is designed to prevent trauma to the delicate structures of the human airway. This tip, which is flanked by double Murphy eyes, flexes and yields as it is advanced into contact with protruding features of airway anatomy. The centred tip tends to move along the midline of the airway and the glottic opening. The tip’s curvature predisposes it to “ski” gently along airway surfaces.
The centred, curved tube tip lies closely against the wall of the fiberscope or introducer and minimises any gap between them which could contribute to the tube hang-ups in the larynx which frequently occur when using a tube with a standard, side-bevelled tip.
http://dent.osu.edu/anesthesiology/article1/a.htm – Parker Tube Intubation
http://dent.osu.edu/anesthesiology/article1/k.htm – Standard Tube intubation