OXYGEN CONCENTRATION SYSTEM HAVING SELECTABLE BEDS

摘要

A patient ventilator oxygen concentration system (S) has an input air supply (10) for supplying an input gas (12) at a desired pressure. An oxygen concentrating system (14) produces an oxygen concentrated gas output (16) and includes at least 2 operable molecular sieve bed modules (18). An input flow line (22) communicates input gas from the input air supply (10) to the molecular sieve bed modules (18). A medical grade air system (24) produces a medical grade air output (26). The oxygen concentrating system (14) and the medical grade air system (24) are connected in a parallel flow path of the input gas from the input air supply (10). A switch unit system (V) is in an input flow path (22) of the oxygen concentrating system (14) for controllably curtailing a portion of the input gas supplied by the input air supply (10) to at least one molecular sieve bed module (18) while having no input gas reduction effect on remaining molecular sieve bed modules. The switch unit system (V) controllably increases available gas for conversion into medical grade air.