A laryngeal mask airway (LMA) is a medical device that is inserted into a patient's mouth and throat to provide a clear airway for spontaneous or controlled ventilation. It is a type of supraglottic airway device, which means that it is placed above the glottis (opening to the trachea). The LMA is a safe and effective alternative to endotracheal intubation in certain clinical situations. The device is a tube-shaped mask with an inflatable cuff that seals off the patient's larynx (voice box) and upper esophagus.