Source @ ttp://www.marketresearchstore.com/report/stationary-oxygen-concentrators-market-shares-strategies-and-forecasts-19915

Oxygen concentrator markets at $669.5 million in 2014 are anticipated to reach $2 billion dollars by 2021.  Growth is a result of new competitors in the market, demand for the smaller lighter technology by patients, and the market need by for stationary devices at home even as portable devices provide greater mobility support for older people.