Angulated and straight catheters were passed through endotracheal tubes in a series ofinfants and young children and the position in the tracheobronchial tree was verified by chest radiography. In twenty-nine out of thirty-four attempts in one cadaver and eighteen children the angulated catheter entered the left main bronchus, whilst in nineteenout of twenty-two attempts a straight catheter entered the right main bronchus. The use and advantage of an angulated catheter for tracheobronchial suction are discussed.