Technique of lung ventilation through an injector

Clinical and experimental evidence that the risks of ventilation through an injector can be diminished if the rate of gas flow in the tracheal probe is kept slow is presented. In practice those inlet devices for oxygen which permit an acceleration of the flow at the end of insufflation give better ventilation. The oxygen and air mixture is more uniform and the distribution is more physiological if there are side holes in the tube; the intake of additional air is then not due to the Bernoulli effect but to the effect of propulsion. Lung ventilation through an injector is worthwhile and is the only possible method in some cases, but it demands skill and care.