A<unk>  is a catheter that is inserted into the<unk> for the primary purpose of establishing and maintaining a patent airway and to ensure the adequate exchange of oxygen and carbon dioxide. Many different types of<unk> s are available, suited for different specific applications: * An endotracheal tube is a specific type of<unk>  that is nearly always inserted through the mouth (orotracheal) or nose (nasotracheal). * A tracheostomy tube is another type of<unk> ; this curved metal or plastic tube may be inserted into a tracheostomy stoma (following a tracheotomy) to maintain a patent lumen. * A<unk>  button is a rigid plastic cannula about 1 inch in length that can be placed into the tracheostomy after removal of a tracheostomy tube to maintain patency of the lumen.
Tracheal tube
Laryngeal tube
Chest tube
Pulmonary bay
Nasal cannula
Tracheotomy
Elastomeric respirator
Electrolarynx