My dad ended up with COPD from years of smoking. He was prescribed oxygen in his early 80s. He started out with bottles and then got a home O2 generator and a hose that would reach anywhere in the house. The O2 generator pretty much ran 24/7 when he was home. Since it was a rental paid for by medicare, it got checked failry regularly by the medical supply company and he never had any problems. He also got a portable rechargable unit he could carry around with him. He could plug it into his car to keep it charged. I think it ran for something like 3 to 6 hours. It was about the size of a woman's purse. Both devices worked well enough for him to pretty much do what he wanted to do.
I delivered & set up medical oxygen for awhile, as a post-retirement gig. This is all spot on.
