Comparison of second generation supraglottic airway devices about anesthesiologist, endoscopist and patient, which used for gastrointestinal procedures. The investigators believe that the endoscope will be easier to reach by the part of GLT extending to the esophagus, but the structural stiffness of this part may damage the esophageal mucosa. On the other hand, since the endoscopic canal of the LMA® Gastro ends at the upper end of the esophagus, it may be more difficult to orient the endoscope to the esophagus, but it may be superior in terms of ventilation efficiency. Therefore these two device worth for comparing.
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Oropharyngeal leak pressure
Timeframe: Intra-operative; after device insertion
Endoscopist satisfaction analysis: score
Timeframe: Immediately after the procedure
Leakage rate percentages
Timeframe: Intra-operative; after device insertion at first minute