Performing an upper airway obstruction or tracheostomy is vital to the survival of K9s, which is why this lifelike model was developed. Cricothyrotomy may also be performed on the model. Incisions can be made to the skin layers, the cricothyroid membrane and between the tracheal rings. Louie comes with three sets of replaceable tracheas and skins and one artificial lung. Incisions and sutures can be made on the skins and trachea.