To compare a polyvinyl chloride tube with a wire-reinforced tube for tracheal intubation through the SaCoVLM video laryngeal mask airway, to observe the success rate of intubation and the incidence of postoperative adverse reactions, and to explore the best type of endotracheal tube through the SaCoVLM video laryngeal mask airway, so as to provide reference for its clinical application.
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The total success rate of tracheal intubation
Timeframe: From the beginning of the general anaesthesia induction to tracheal intubation through an SaCO Laryngeal Mask Airway. It will take up to half hour or 1 hour.