Patients with difficult airways,Patients who need to remain tracheal intubation to return to the ward after surgery,After signing the informed consent, those who were conscious and awake during the perioperative period refused to continue to participate in the test.

Patients with difficult airways,Patients who need to remain tracheal intubation to return to the ward after surgery,After signing the informed consent, those who were conscious and awake during the perioperative period refused to continue to participate in the test.