Hamaekers et al. Achieving an adequate minute volume through a 2 mm transtracheal catheter in simulated upper airway obstruction using a modified industrial ejector. Br J Anaesth. 2010

The ineffectiveness and danger of using transtracheal jet ventilation in cases of complete upper airway obstruction motivated Prof. Enk to search for a better solution. Prof. Enk’s workgroup transformed a small, industrial ejector into a simple, manual ventilator providing expiratory ventilation assistance (EVA). They showed that EVA shortened the expiration time and that a minute volume up to 6.6 L/min could be achieved through a 2 mm I.D. transtracheal catheter in a simulated obstructed airway.