A ventilator device and system comprising a rotating compressor, preferably
a drag compressor, which, at the beginning of each inspiratory ventilation
phase, is accelerated to a sufficient speed to deliver the desired
inspiratory gas flow, and is subsequently stopped or decelerated to a
basal flow level to permit the expiratory ventilation phase to occur. The
ventilator device is small and light weight enough to be utilized in
portable applications. The ventilator device is power efficient enough to
operate for extended periods of time on internal or external batteries.
Also provided is an oxygen blending apparatus which utilizes solenoid
valves having specific orifice sizes for blending desired amounts of
oxygen into the inspiratory gas flow. Also provided is an exhalation valve
having an exhalation flow transducer which incorporates a radio frequency
data base to provide an attendant controller with specific calibration
information for the exhalation flow transducer.
