Surgery – Respiratory method or device – Means for supplying respiratory gas under positive pressure
Patent
1989-11-06
1990-11-20
Burr, Edgar S.
Surgery
Respiratory method or device
Means for supplying respiratory gas under positive pressure
12820426, A61M 1600
Patent
active
049710494
ABSTRACT:
A flow control device for supplying oxygen to a medical patient using provides pulses of oxygen only when the patient inhales, using a flow valve unit that receives a pressurized oxygen supply and delivers a controlled oxygen supply output through a cannula to a patient. A pressure sensor detects breathing changes and output signals that are amplified and automatically corrected for signal errors, such as those caused by offset voltage and temperature drift, by use of a negative integral feedback module that includes automatic correction circuits and a switch for selectively disconnecting the feedback. The amplified sensor signal generates control signals, including an output pulse delivered to the flow valve, having a pulse width that is a user adjustable for control of the opening and closing of a valve, such as a three-way solenoid valve, for outputting time selectable pulses of oxygen to the patient when patient inhalation is detected by the pressure sensor.
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Rotariu William J.
Wobschall Darold
Burr Edgar S.
Lewis Aaron J.
Pulsair, Inc.
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