 There are a number of different types of double @-@ lumen endo @-@ bronchial tubes that have endobronchial as well as endotracheal channels ( <unk> , White and <unk> tubes ) . These tubes are typically coaxial , with two separate channels and two separate openings . They incorporate an endotracheal lumen which terminates in the trachea and an endobronchial lumen , the distal tip of which is positioned 1 – 2 cm into the right or left mainstem bronchus . There is also the <unk> tube , which has a single tracheal lumen and an integrated endobronchial blocker . These tubes enable one to ventilate both lungs , or either lung independently . Single @-@ lung ventilation ( allowing the lung on the operative side to collapse ) can be useful during thoracic surgery , as it can facilitate the surgeon 's view and access to other relevant structures within the thoracic cavity . 
