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Classification of extraglottic airway devices; (1) Classic laryngeal mask airway, (2) laryngeal mask airway flexible (3) laryngeal mask airway unique (4) lma proseal, (5) lma supreme, (6) fastrachlma, (*) directional only when the handle is engaged, (7) ambu laryngeal mask airway, (8) laryngeal tube (9) laryngeal tube s, (10) airq-self pressurizing, (11) streamlined liner of the pharynx airway, (12) cobra perilaryngeal airway
