Patent ID: 8888902

Claim:
A device for oxygen enrichment, comprising: a compressor ( 129 ); an air storage vessel ( 113 ) having a system purge valve ( 125 ); at least one pressure swing adsorption unit ( 111 ); an oxygen purge storage vessel ( 117 ); an oxygen bolus storage vessel ( 119 ) having a pressure sensor ( 137 ); an oxygen delivery button and nozzle assembly ( 103 ); at least one power source; electronic control unit ( 131 ); an optional charging port ( 109 ); a first passageway (A) connecting said compressor ( 129 ) and said air storage vessel ( 113 ); a second passageway (B) connecting said air storage vessel ( 113 ) and said pressure swing adsorption unit ( 111 ); a third passageway (C) connecting said pressure swing adsorption unit ( 111 ) and said oxygen purge storage vessel ( 117 ); a fourth passageway (D) connecting said oxygen purge storage vessel ( 117 ) and said oxygen bolus storage vessel ( 119 ); a fifth passageway (E) connecting said oxygen bolus storage vessel ( 119 ) and said delivery nozzle ( 103 ); a first pressure swing adsorption valve ( 123 ) associated with said second passageway (B), pressure swing adsorption unit ( 111 ), and exhaust to ambient pressure; wherein said first pressure swing adsorption valve is a three-way valve or two two-way valves; a restrictor assembly ( 120 ) positioned between said pressure swing adsorption unit ( 111 ) and said oxygen purge storage vessel ( 117 ) and connected to said third passageway (C); wherein said restrictor assembly is a separate component or a part of said pressure swing adsorption unit; a check valve/restrictor ( 135 ) positioned between said oxygen purge storage vessel ( 117 ) and said oxygen bolus storage vessel ( 119 ); and a delivery valve ( 127 ) positioned between said oxygen bolus storage vessel ( 119 ) and said delivery nozzle ( 103 ).