968642.fig.002a
(a)
968642.fig.002b
(b)
Figure 2: (a) When the OD of the AEC is significantly smaller than the ID of the tube, the tip of the tube protrudes away from the AEC and is susceptible to impingement at the glottis. (b) With the OD of the AEC relatively large compared to the ID of the tube, the tip of the tube does not protrude as much and the possibility of impingement is reduced.