What is a dilator used to do during a surgical cricothyroidotomy?

A dilator is used during a surgical cricothyroidotomy to enlarge the incision made in the cricothyroid membrane, allowing for the insertion of a breathing tube. This tool helps to create a sufficient passageway for air to flow directly into the trachea, bypassing any obstructions in the upper airway. Proper dilation is crucial to ensure that the airway is secured effectively and quickly in emergency situations.