Supraglottic airway structure specifically used for anaesthesia

A supraglottic airway (laryngeal mask) structure specifically for use during anaesthesia, comprises a silicone mask (20) and a main tube seat (10) with a diverging tube opening (11). The tube seat (10) fits through the silicone mask (20). A rubber annular tube (60) with differing diameters is implanted in the mask (20). A soft sleeve (30) is fitted on the mask (20). The inner diameter of the soft sleeve (30) corresponds to the profile of the tube seat (10). The soft sleeve (30) is pushed forward to make an upper tube opening (12) of the main tube seat (10) protrude out of the soft sleeve (30). An anaesthetic gas intake tube (50) with an engaging flange (52) is fitted through the diverging section (11) of the main tube seat (10) and engages therewith. A fine string (40) is used to tie up the soft sleeve (30), main tube seat (10) and the intake tube (50) so as to prevent the soft sleeve from detaching from the main tube seat (10).