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A portable oxygen concentrator includes a pressure swing absorption system defined by a relatively rigid housing adapted to generate a flow of oxygen enriched gas and a battery adapted to provide power to the pressure swing absorption system. The oxygen concentrator has a total weight of less than a

A portable oxygen concentrator includes a pressure swing absorption system defined by a relatively rigid housing adapted to generate a flow of oxygen enriched gas and a battery adapted to provide power to the pressure swing absorption system. The oxygen concentrator has a total weight of less than about 10 lbs, has a maximum flow of 100% O2 equivalent gas of about 0.9 lpm, has a total volume less than about 800 in3, and gas a battery life of at least about 8 hours. The present invention also using a liquefaction or transfill system in combination with such an oxygen concentrator.

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1. An ambulatory oxygen concentrator comprising: a pressure swing adsorption system adapted to generate a flow of oxygen enriched gas, wherein the pressure swing adsorption system includes: a compressor that comprises a motor, andtwo or more sieve beds that are charged and purged to extract oxygen-e

1. An ambulatory oxygen concentrator comprising: a pressure swing adsorption system adapted to generate a flow of oxygen enriched gas, wherein the pressure swing adsorption system includes: a compressor that comprises a motor, andtwo or more sieve beds that are charged and purged to extract oxygen-enriched gas from ambient air using sieve bed pressurization and sieve bed purging;battery adapted to provide power to the pressure swing adsorption system,wherein the oxygen concentrator has a total weight of less than about 10 lbs, the pressure swing adsorption system has a maximum continuous flow of 100% O2 equivalent gas of between about 0.9 lpm and 1.2 lpm, the oxygen concentrator has a total volume less than about 800 in3, and the oxygen concentrator has a battery life of greater than 8 hours,wherein the battery has a maximum current that can be drawn, wherein the oxygen concentrator is configured to limit current drawn from the battery by the motor of the compressor during sieve bed pressurization to a first current, wherein the first current is no more than half of the maximum current. 2. The concentrator of claim 1, wherein the pressure adsorption system comprises: a reservoir that receives oxygen enriched gas from the two or more sieve beds, anda controller that determines time lengths for the charge and purge cycles of the two or more sieve beds based on the pressure of the reservoir. 3. The concentrator of claim 1, further comprising an oxygen conserver coupled to an output of the pressure swing adsorption system, wherein the oxygen conserver is adapted to control the flow of oxygen enriched gas is delivered to a patient such that a bolus of oxygen enriched gas is provided to a patient during the first 600 ms of an inspiratory phase of a breathing cycle. 4. The concentrator of claim 1, further comprising: an air manifold defining a plurality of passages therein, wherein the plurality of passages includes: a compressor inlet passage configured to communicate between ambient air and the compressor,a compressor outlet passage configured to communicate between the compressor and the two or more sieve beds, andan exhaust passage configured to communicate between the two or more sieve beds and ambient air,wherein individual passages in the plurality of passages within the air manifold have a diameter of at least about 0.25 inch. 5. The concentrator of claim 1, wherein the oxygen concentrator is configured to limit current drawn from the battery by the motor of the compressor during sieve bed pressurization to the first current such that, responsive to rising pressure in a sieve bed during sieve bed pressurization, motor speed of the motor of the compressor is reduced. 6. The concentrator of claim 1, wherein the oxygen concentrator is configured to allow motor speed of the motor of the compressor to fall during sieve bed pressurization. 7. The concentrator of claim 1, wherein a second compressor is operatively coupled to the pressure swing adsorption system so as to receive at least a portion of the flow of oxygen enriched gas, wherein the second compressor is adapted to increase a pressure of the received oxygen enriched gas. 8. The concentrator of claim 7, wherein the second compressor is a piston compressor that increases the pressure of the flow of oxygen enriched gas to at least 1500 psi. 9. The concentrator of claim 7, further comprising a portable storage vessel adapted to be coupled to the second compressor and to store the pressurized oxygen enriched gas for user consumption. 10. The concentrator of claim 7, further comprising an outlet port provided between the pressure swing adsorption system and the second compressor to enable a user to consume the oxygen enriched gas from the oxygen concentrator. 11. The concentrator of claim 10, wherein the outlet port is configured such that the user is capable of consuming the oxygen enriched gas from the pressure swing adsorption system simultaneous with the oxygen enriched gas being provided to the second compressor. 12. An oxygen concentrator comprising: a pressure swing adsorption system adapted to generate a flow of oxygen enriched gas, wherein the pressure swing adsorption system includes two or more sieve beds and a compressor, wherein the two or more sieve beds are charged and purged to extract oxygen-enriched gas from ambient air using sieve bed pressurization and sieve bed purging, wherein the compressor includes a motor; anda battery carried by the oxygen concentrator, the battery being configured to provide power to the pressure swing adsorption system,wherein a ratio RODWis determined as: RODW=(O2 output*duration)/total weight, where O2 output is the maximum continuous 100% oxygen equivalent gas output of the pressure swing adsorption system, duration is the battery life of the oxygen concentrator over a single charge of the battery, and weight is a total weight of the oxygen concentrator including the battery, wherein the RODW for the oxygen concentrator is not less than about 0.73 (lpm-hr)/lbs, wherein the oxygen concentrator has a battery life of greater than 8 hours,wherein the battery has a maximum current that can be drawn, wherein the oxygen concentrator is configured to limit current drawn from the battery by the motor of the compressor during sieve bed pressurization to a first current, wherein the first current is no more than half of the maximum current. 13. The concentrator of claim 12, wherein the RODWfor the oxygen concentrator is not less than about 0.95 (lpm-hr)/lbs.