Comparison of clinical application of Ambu LMA and SLIPA LMA in airway management under general anesthesia in children: a prospective randomized controlled trial

INTERVENTION: Group A:LMA Ambu will be used for mechanical ventilation during operation;Group S:LMA SLIPA will be used for mechanical ventilation during operation; CONDITION: N/A PRIMARY OUTCOME: Airway Sealing Pressure of LMA; SECONDARY OUTCOME: Success rate of single LMA insertion;Total success rate of LMA insertion;Bronchoscope score;Times and difficulty attempts to place sputum suction tubes;Mean airway pressure; INCLUSION CRITERIA: Select children aged 1 month to 7 years in our hospital, who are graded I to II by the American Association of Anesthesiologists (ASA) and who are scheduled to undergo superficial or peripheral limb surgery under general anesthesia within 2 hours.