The rigid bronchoscope is also known as an open tube bronchoscope, open tube, straight bronchoscope, or ventilating bronchoscope. It is a rigid, straight, hollow metal tube that is available in several sizes. Its purpose is to provide access to the airways. The external diameter of a rigid bronchoscope varies from 2 to 14 mm, wall thickness ranges from 2 to 3 mm, and length varies from a very short tube (for pediatric cases) to a long or extra-long tube (for adults).