Patent ID: 8522780

Claim:
A portable ventilator, comprising: a blower configured to operate in variable speed mode; an exhalation servo configured to provide a desired positive end expiratory pressure (PEEP) from an output of the blower; a ventilator processor configured to communicate instructions to alternately accelerate the blower to effect inspiration and decelerate the blower to permit exhalation, wherein the ventilation processor is further configured to automatically adjust a speed of the blower throughout the inspiration to obtain a desired flow, volume and pressure based on a comparison of a monitored pressure to said desired pressure; a blower processor operative to receive said instructions and to control operation of the blower; an exhalation processor operative to control actuation of an exhalation control valve; a blender processor operative to regulate oxygen concentration in gas delivered to a patient; and a pressure processor operative to monitor at least one pressure transducer disposed within the portable ventilator and to command a periodic purging of said pressure transducer with dry gas from a non-accumulated outlet of said blower.