| 摘要 |
A portable resuscitator/ventilator device especially intended for emergency use and powered by pressurised primary breathable gas such as oxygen or compressed air from a bottle 14 comprises a control unit 10 that outputs primary gas pulses to a patient valve 12 that includes an entrainment mixer 20 for diluting the primary gas with air. The entrainment mixer is selectively operable so that the patient valve delivers primary gas or air-diluted primary gas as required. The control unit includes a flexed value flow- control restrictor 18 that passes a required tidal volume of primary gas for undiluted delivery to the patient and the impedance of the patient valve is arranged to increase when the entrainment mixer is operational so that flow of the primary gas is automatically reduced to provide the required tidal volume of air-diluted primary gas without wastage of primary gas or any adjustment of the control unit. <IMAGE> |
