Cuffed Endotracheal tube

A physician inserts an endotracheal tube under direct vision, with the help of a laryngoscope, in a procedure called endotracheal intubation. The purpose of using an endotracheal tube is to ventilate the lungs. The cuff of the endotracheal tube  is designed to provide a seal within the airway, Allowing airflow through the Endotracheal tube but preventing passage of air or fluids around the Endotracheal tube.