The current and future status of portable oxygen concentrators.

I remember attending a pulmonary conference in the early 1980s whenI was still in New Jersey. A guest speaker at the conference came inwith what looked like a Samsonite suitcase on a wheeled cart. It weighedmore than 20 pounds and was powered by a marine type battery. It was thefirst portable oxygen concentrator (POC) we ever saw, and we were inawe.

Just 10 years earlier, some of the first oxygen concentrators were being introduced, and those weighed close to 150 pounds and used tons of electricity with substantial noise and heat production. The oxygen production was also poor, around 40 to 50 percent. We were amazed then about how technology was going to change the fa