A<unk>  is generally not used in surgeries where there is a high risk that stomach contents may be aspirated. This is particularly for surgeries that longer than 2 hours. It often uses low inflation pressures, so may not be appropriate in patients with illnesses that cause low lung compliance. As it is typically larger and more obstructive than tracheal intubation, it is generally not used for surgery of the mouth and throat.
Laryngeal mask airway
Venturi mask
N95 respirator
Elastomeric respirator
Electrolarynx
Nasal cannula
Chondrolaryngoplasty
Nasal irrigation