 The tracheal tube exchanger is a hollow catheter , 56 to 81 cm ( 22 @.@ 0 to 31 @.@ 9 in ) in length , that can be used for removal and replacement of tracheal tubes without the need for laryngoscopy . The Cook Airway Exchange Catheter ( CAEC ) is another example of this type of catheter ; this device has a central lumen ( hollow channel ) through which oxygen can be administered . 
