Background
airway injuries
Currently, visualization techniques are becoming increasingly popular for its reduction in reducing the risk of severe intubation reactions and failed intubations. Nevertheless, both anticipated and unanticipated difficult airways still result in failed intubation, which not only puts the anesthesiologist in an embarrassing dilemma, but also threatens the life and safety of the patients, we cannot use only one device to deal with all difficult airways encountered.The video laryngoscope, a conventional glottic visualization device, has been considered the gold standard device for transoral tracheal intubation by anesthesiologists worldwide, and its availability has led to unprecedented improvements in the field of view during intubation, success rates of tracheal intubation, shortened intubation times, and even reduced intubation-related airway injuries compared with conventional direct laryngoscopy [