Retrospective Study
Copyright ©The Author(s) 2021.
World J Anesthesiol. Dec 2, 2021; 10(2): 7-15
Published online Dec 2, 2021. doi: 10.5313/wja.v10.i2.7
Figure 1
Figure 1 Regular tube (lower) and pre-formed tube (upper) with one bend at 9 cm and 30° from the horizontal plane (natural curve) and a second bend at 18 cm and at 30° right to the vertical plane.