Surgery – Respiratory method or device – Means for supplying respiratory gas under positive pressure
Patent
1988-11-15
1991-09-17
Lewis, Aaron J.
Surgery
Respiratory method or device
Means for supplying respiratory gas under positive pressure
12820421, 12820418, A61M 1600
Patent
active
050485156
ABSTRACT:
A supplemental respiratory gas supply control apparatus and method for providing supplemental gas to an in vivo respiratory system includes a pressure sensor adapted to produce pressure indicative signals indicative of pressures sensed, a gas flow control valve, a sensor communication control valve, and a central control unit adapted to receive pressure indicative signals generated by the pressure sensor and to control the gas control valve and the sensor communication control valve in accordance with the signals received. The gas control valve is connected to a source of supplemental gas at regulated pressure and has two positions, a first position isolating the source of supplemental gas from the single hose cannula and a second position communicating the source of supplementary gas with the cannula hose to provide a flow of supplementary gas to the in vivo respiratory system. The pressure sensor communication control valve has a first mode placing the pressure sensor in communication with the cannula hose to allow the pressure sensor to sense the pressure within the hose and a second mode in which the pressure sensor is placed in communication with the ambient atmsophere. The central control unit initially places the gas control valve in the first position and the sensor communication valve in the first mode to monitor the pressure within the cannula hose.
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Lewis Aaron J.
Oxenham J. Preston
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