Chevalier-Jackson Tracheotomy Fig mmØ 45-90mm 0 4 Y17.140.04 1 5 Y17.140.05 2 6 Y17.140.06 3 7 Y17.140.07 4 8 Y17.140.08 5 9 Y17.140.09 6 10 Y17.140.10 7 11 Y17.140.11 8 12 Y17.140.12 9 13 Y17.140.13