Patent ID: 6055981
Filing Date: 2000-05-02
Classification: A61M

Abstract:
A transport ventilator device for administering a breathable gas under pressure to a patient by an operator, the device having controls powered by said pressurised gas in a manual override mode, a patient breathing demand override mode, and an automatic mode, the device comprising:a housing enclosing a patient breathing circuit comprising: a gas accumulation chamber; a breathing chamber; breathing check valve means therebetween for permitting one way passage of inhaled gas from the accumulation chamber to the breathing chamber; and exhale check valve means for permitting passage of patient exhaled breath from the breathing chamber to atmosphere external to the device;a pressure regulator having regulator input port means for admitting said gas into the device from a source of pressurised gas, and having a regulator outlet;gas distribution means for distributing gas between the regulator outlet and the gas accumulation chamber selectively via a manual circuit, a demand circuit and an automatic circuit wherein the automatic circuit includes:an automatic distribution conduit between the regulator outlet and the gas accumulation chamber, and wherein the control means includes:timing switch means for opening and closing the automatic distribution conduit at selected intervals;frequency control means for actuating the timing switch means at a predetermined timing cycle corresponding to a patient inhale-exhale breathing pattern; andflow control means for selecting a predetermined gas flow rate through the automatic distribution conduit independently of the timing cycle;control means, powered solely by the pressure differential between the pressurised gas from the regulator input port means and atmospheric pressure external to the device, for monitoring and controlling said gas distribution means, wherein the control means include pressurised gas powered alarm means selected from the group consisting of:breathing circuit integrity alarm means for notifying the operator that an integrity condition has been detected;power fail alarm means for notifying the operator that the source of pressurised gas has a pressure below a selected source input value; andpressure relief alarm means for notifying the operator that the patient's airway is above the selected pressure relief value.