Patent ID: 7510601

Claim:
A portable medical oxygen concentrator comprising (a) an air separation system adapted to recover oxygen from air, wherein the air separation system comprises (1) two or more adsorbent columns, each column including a feed end, a product end, and adsorbent material for effecting gas separation by selective adsorption; (2) a pump assembly comprising a feed pump having a compressed air outlet and a vacuum pump having a gas inlet; (3) an oxygen product outlet; (4) a rotary valve having a first plurality of ports adapted to place the compressed air outlet of the feed pump in flow communication sequentially with the feed end of each adsorbent column and to place the gas inlet of the vacuum pump in flow communication sequentially with the feed end of each adsorbent column and having a second plurality of ports adapted to place the oxygen product outlet in flow communication sequentially with the product end of each adsorbent column and to place the product end of each adsorbent column in flow communication sequentially with the product end of another adsorbent column; and (5) a base assembly adapted to support the two or more adsorbent columns and the rotary valve; (b) a bottom platform and a shell having an outer wall, wherein the shell is detachably connected to the bottom platform, wherein the base assembly is attached to the bottom platform, wherein the shell and bottom platform define an enclosed volume when the shell is connected to the bottom platform, and wherein the air separation system is disposed in the enclosed volume; and (c) one or more rechargeable batteries detachably connected to the outer wall of the shell and adapted to provide power to drive the air separation system.