1) Applications: used for single-lung aerating (synchronization and non- synchronization) in thorax operation or gravity patients 2) Special design of low-pressure tube and bronchial cuff can help reduce the esion of mucoca 3) Pilot balloon and bronchial cuff have the same color, which can help judge the position of tube 4) Phlegm suction catheter: there are 3 catheters, 2 graduated ones help judge the exact position to suck phlegm, the left one sucks phlegm in mouth 5) Swivel connector configuration: it connects ventilator with double-lumen bronchial be, thanks to the swivel connector, position of ventilator is flexible 6) Specifications: Fr26, Fr31, Fr33, Fr35, Fr37, Fr39, Fr41