Patent ID: 7849854

Claim:
A portable compressor ventilator device for ventilating the lungs of a mammalian patient, said device comprising: a compressor and an oxygen blending apparatus for combining oxygen with ambient air into an oxygen-enriched inspiratory flow containing a prescribed oxygen concentration prior to entering the compressor; a tubing circuit in air communication with the oxygen blending apparatus wherein the tubing circuit is sized and configured to interface with the mammalian patient for delivering the combined oxygen/ambient air directly to the mammalian patient; a controller that controls the compressor and the oxygen blending apparatus; and a battery that supplies power to the blending apparatus and the controller; wherein the oxygen blending apparatus comprises: an oxygen inflow manifold; an oxygen outflow manifold; an accumulator connected to the oxygen outflow manifold and an input of the compressor; a plurality of solenoid valves arranged in parallel between the oxygen inflow manifold and the oxygen outflow manifold; wherein each of the solenoid valves has a specific sized flow restricting orifice, a first solenoid valve of the plurality of solenoid valves having a different sized flow restricting orifice compared to a second solenoid valve of the plurality of solenoid valves; and wherein each of the solenoid valves has a predetermined trigger volume, the controller independently opening each of the solenoid valves when an accumulated volume of the combined oxygen/ambient air drawn from the accumulator reaches the trigger volume.