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Difficult Airway Magill-shaped The Difficult Airway Blade or DAB polyvinyl chloride Blade has a high tube profile and therefore is difficult to insert in patients with limited mouth opening or severe retrognathia (where the blade needs to be inserted cephalically and requires extra mouth opening).
(Figs 23, 24a, b, 31, 32[1D, 2D, 3D, 4D, 5D]) are characterized by a stouter epiphallus (anterior process more widely developed, posterior process shorter), apodemes of cingulum cephalically more expanded and converging, internal valves of aedeagus shorter and distally less expanded (lateral view) than in N.