Patients assigned to the Extraluminal use of Univent Blocker group were first inserted Univent bronchial Blocker into the glottis via direct laryngoscopy then advanced the Blocker to the target bronchus until slight resistance was encountered.A conventional tracheal tube with appropriate size was intubated via direct laryngoscopy into the appropriate depth, inflating the tracheal tube cuff, and fixing the tube firmly at the patient's mouth with cloth tape .

So the Univent Blocker Extraluminal of the endotracheal tube,then the fibreoptic bronchoscopy was inserted into the tracheal tube and guided bronchial blocker cuff to the target main bronchus under direct vision

Patients in Innerluminal use of Univent Blocker group: When the endotracheal tube had been intubated via direct laryngoscopy, the bronchial blocker was advanced Innerluminal of the endotracheal tube and directed into the right or left mainstem bronchus, then the fibreoptic bronchoscopy was inserted into the tracheal tube. After further pushing and twisting, the bronchial blocker tube will move into the mainstem bronchus under direct vision by FOB.the tracheal tube cuff is inflated with the tube being fixed firmly at the patient's mouth with cloth tape

Patients assigned to the Extraluminal use of Univent Blocker group were first inserted Univent bronchial Blocker into the glottis via direct laryngoscopy then advanced the Blocker to the target bronchus until slight resistance was encountered.A conventional tracheal tube with appropriate size was intubated via direct laryngoscopy into the appropriate depth, inflating the tracheal tube cuff, and fixing the tube firmly at the patient's mouth with cloth tape .

So the Univent Blocker Extraluminal of the endotracheal tube,then the fibreoptic bronchoscopy was inserted into the tracheal tube and guided bronchial blocker cuff to the target main bronchus under direct vision