“…Initially some authors focused on wrapping the tube with thin metal foils [4,[9][10][11][12][13][14] as a safety precaution, which should protect the shafts from direct, continuous high power CO 2 laser radiation. On the other hand there have been reports on tube fires or explosions, even in wrapped tubes, for example, when the laser beam first heats, then melts, and finally ignites the ETT [2,15,16]. Other side effects of metal foils are, that their surfaces are often highly reflective and that occasionally the metal tape becomes loose and its edges may cut the surrounding tissues [17].…”