Puritan-bennett Corporation

Other

Purtian-bennett Corporation

Glen N Gee

John J O'Mahony

Edwin B Merrick

John O'Dea

Warren G Sanborn

Gardner Kimm

Paul J Fennema

The gas mixing apparatus provides the components of a breathing gas for mixing at approximately ambient atmospheric pressure, and regulates the pressure of a selected gas to approximately ambient atmospheric pressure for mixing with air at ambient atmospheric pressure. The gas mixing apparatus includes a piston disposed within a pump chamber. A flow limiting inlet controls introduction of a first selected gas such as oxygen for mixing with a second selected gas such as air. The pressure of the first selected gas is limited to an acceptable maximum pressure, so that even if a valve for admitting the first selected gas for mixing at ambient pressure fails, breathing gas will not be provided at an excessive pressure. A demand valve is alternatively provided for reducing the pressure of the first selected gas supplied before mixing, but a pressure sensor is also provided downstream of the demand valve for detecting failure of the demand valve, to shut off the supply of the first selected gas to prevent overpressurization.

Gas mixing apparatus for a ventilator

The system and method for flow triggering pressure supported ventilation include a source of a predetermined, preinspiratory, constant flow of breathing gas to a patient, one or more flow sensors for measuring the rate of gas flow in a flow path communicating with the patient, means for determining when inhalation from the flow path has occurred, and means for generating pressure support in the delivered gas flow in response to inhalation by the patient, means to terminate pressure support when inspiratory phase concludes, and means to reestablish the predetermined, preinspiratory, continuous flow of breathing prior to the patient's next inspiratory effort. A plurality of individual gas sources preferably provide a controlled mixture of breathing gas. In combination with pressure support to the patient during the inspiration effort, the flow triggering strategy of the invention offers significant improvements in providing breath support to patients having weakened respiratory capabilities.

System and method for flow triggering of pressure supported ventilation

The method for flow triggering breath supported ventilation is accomplished by providing a system comprising a source of a predetermined, preinspiratory, constant flow of breathing gas and connecting such to a patient breathing attachment. One or more flow sensors measure the gas flow rate in a flow path communicating with the patient breathing attachment, determining when inhalation from the flow path has occurred. Breath support is generated in the delivered gas flow in response to inhalation by the patient, and the predetermined, preinspiratory, continuous flow of breathing gas is reestablished prior to the patient's next inspiratory effort. In combination with various types of breath support, the flow triggering strategy of the invention offers significant improvements in providing breath support to patients having weakened respiratory capabilities.

System and method for flow triggering of breath supported ventilation

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Carlsbad, CA, United States of America

Glen N Gee