| 摘要 |
<p>A resuscitation/ventilation apparatus incorporates an entrainment mixer with a nozzle 1, discharging entraining gas into an entrainment chamber 2, the nozzle 1 being connected with a high pressure source 12 of the entraining gas. One entrainment port 3a to the entrainment chamber is connected to atmosphere and another entrainment port 3b is connected to an oxygen source. A continuously variable restriction 15 is disposed in the oxygen supply conduit upstream of the other entrainment port 3b and is variable independently of any control of the entraining gas supply, to enable delivery of a calibrated flow of a gas mixture of steplessly variable calibratable oxygen concentration.</p> |
