Fig. (4) Illustration of the Ventrain^® used in conjunction with a transtracheal catheter Cricath^® (left) and a small-bore airway catheter (right) such as those used to exchange endotracheal tubes or those used to assist with tracheal extubation. In addition to providing a means to facilitate reintubation, such airway catheters can also be used with the Ventrain^® to maintain ventilation and oxygenation until a definitive airway is established.