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. Author manuscript; available in PMC: 2013 Nov 15.
Published in final edited form as: Heart Lung. 2011 Dec 30;41(2):10.1016/j.hrtlng.2011.09.001. doi: 10.1016/j.hrtlng.2011.09.001

Figure 2.

Figure 2

Microchannels form as the result of variations in patient airways. A polyurethane cuff designed to eliminate leakage through these folds is shown. Image used by permission from Nellcor Puritan Bennett LLC, Boulder, Colorado, doing business as Covidien.