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Different tracheostomy tubes. (A) Shiley™ 8DCT (7.6 mm I.D., 12.2 mm O.D., 79 mm L), inner cannula is required for connection to ventilator or bag-mask-valve devices; (B) Portex® Bivona® TTS (8.0 mm I.D., 11.0 O.D, 88 mm L), similar structure to (A), ventilator or bag-valve-mask devices connect directly to the tube (inner cannula not required for connection). DCT, disposable cuffed tracheostomy tube; I.D., inner diameter; O.D., outer diameter; L, length; TTS, tight to shaft.
