 During the past decade, several pharyngeal airways have been introduced into clinical practice for airway management, such as the Laryngeal Mask Airway LMA, the Cuffed Oropharyngeal Airway COPA, the Esophageal Tracheal Combitube ETC, and most recently, the Laryngeal Tube LT. These airway devices have become very popular because of their ability to maintain an airway without perturbing the trachea, and can be used in patients without muscle relaxation and who are only lightly anesthetized. 