Evaluation of an emergency cricothyrotomy instrument.

An emergency cricothyrotomy device was placed in 11 anesthetized dogs in order to assess airway damage and problems in placement, ventilation, and design. Posterior airway perforation without esophageal damage occurred in three animals. Submucosal hematomas or cricoid cartilage injury occurred in seven animals. As placement by an untrained operator was surprisingly difficult, prior operator training with this device is recommended. When properly installed, an excellent emergency airway was achieved. Some minor design shortcomings are noted and suggestions for improvement are made.