Figure 5.

Working mechanism of the Evone® (Bernoulli principle). During the inspiratory phase, tube B, which is simply an air outlet out of the ventilator, is blocked. Therefore, the air that is forced through tube A (air inlet) is insufflated into the lungs of the patient through tube C (the endotracheal small-bore tube). During the expiratory phase, tube B is automatically opened. Therefore, the high-speed air that is insufflated through tube A shoots through tube B. This generates a low pressure, actively suctioning air out of tube C. This phenomenon relies on the Bernoulli principle and is called jet entrainment.