초록 ▼

A portable resuscitator/ventilator device especially intended for emergency use and powered by pressurized primary breathable gas such as oxygen or compressed air from a bottle comprises a control unit that outputs primary gas pulses to a patient valve that includes an entrainment mixer for diluting

A portable resuscitator/ventilator device especially intended for emergency use and powered by pressurized primary breathable gas such as oxygen or compressed air from a bottle comprises a control unit that outputs primary gas pulses to a patient valve that includes an entrainment mixer for diluting the primary gas with air. The entrainment mixer is selectively operable to that the patient valve delivers primary gas or air-diluted primary gas as required. The control unit includes a fixed value flow-control restrictor 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.

대표청구항 ▼

In a gas-powered resuscitator/ventilator device comprising a control unit having a high-impedance flow-regulation restriction and means for providing undiluted primary gas pulse flow therefrom, a patient valve connected to said restriction and including first means having a specific impedance for de

In a gas-powered resuscitator/ventilator device comprising a control unit having a high-impedance flow-regulation restriction and means for providing undiluted primary gas pulse flow therefrom, a patient valve connected to said restriction and including first means having a specific impedance for delivering said undiluted primary gas pulse flow to a patient at a predetermined rate, the improvement comprising said patient valve also including a diluent gas entrainment mixer that when operative dilutes the primary gas pulse flow received from the control unit, the patient valve including second means operative with the entrainment mixer to jointly provide a flow impedance to the primary gas pulse flow such that the primary gas pulse flow combined with the entrained diluent gas flow is delivered to the patient at substantially the same predetermined rate as the undiluted primary gas pulse flow and means for selectively connecting either the first or second means to a patient.