Compared Unidirectional Valve Apparatus and Occluding the Non-ventilated Endobronchial Lumen for Lung Collapse.

In the unidirectional valve group, we attached the unidirectional valve device to the lumen's distal port when one-lung ventilation initiated.

In the closed operative lumen group, we closed the lumen's distal port of non-ventilated lung when one-lung ventilation initiated.