1. The main tube is curved at 90 degrees and is designed with an airway and a drainage tube. The drainage tube can be inserted into the stomach tube to drain gastric juice to prevent gastric bloating, reflux and aspiration;

2. Double air bag design, the ventilation mask better matches the anatomy of the throat and has better sealing;

3. The distal end of the laryngeal mask is located at the esophageal opening. It is well fixed and difficult to shift. It has the advantages of simple operation, high success rate of catheterization, stable hemodynamics, less medication during the induction period and fewer complications. It is highly effective and safe. improve.