![]() The number of manufacturers entering the oxygen concentrator market increased exponentially as a result of this change. Oxygen concentrators became the preferred and most common means of delivering home oxygen. This reimbursement change dramatically decreased the number of primary high pressure and liquid oxygen delivery systems in use in homes in the United States at that time. In the United States, Medicare switched from fee-for-service payment to a flat monthly rate for home oxygen therapy in the mid-1980s, causing the durable medical equipment (DME) industry to rapidly embrace concentrators as a way to control costs. Both of these delivery systems required frequent home visits by suppliers to replenish oxygen supplies. ![]() Before that era, home medical oxygen therapy required the use of heavy high-pressure oxygen cylinders or small cryogenic liquid oxygen systems. Union Carbide Corporation and Bendix Corporation were both early manufacturers. Home medical oxygen concentrators were invented in the early 1970s, with the manufacturing output of these devices increasing in the late 1970s. ![]()
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