"Yes, there are a variety of portable oxygen concentrators. They are advertised on television, and if you are eligible for Medicare, you will probably be able to get one paid for."

The are several reputable companies that produce portable oxygen concentrators, these are Invacare, SeQual, Phillips, AirSep, Inogen One and Respironics.

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Portable oxygen concentrators are energy efficient and use as much electricity as a television. Most portable oxygen concentrators can run 4 hours on battery life alone.

As a general rule, oxygen concentrators produce oxygen at purity levels between about 90-97 percent at most. This is variable, however, with regard to certain factors such as elevation. At lower elevations, oxygen purity will be higher. If you are looking for an oxygen concentrator for personal use, www.VitalityMedical.com has a lot of good information on their blog.