I've recently researched Hyperbaric Oxygen Therapy (HBOT) on the internet for my daughter who has a circulation problem. You can purchase the chambers for $8500 and up, but you need to have it installed in a specially wired room equipped with sprinklers. Very expensive! There are also clinics that specialize in HBOT but this, too, can be costly. Insurance won't cover the treatments because HBOT works well for some people and does absolutely nothing for others. I guess insurance companies don't want to risk paying lots of money for a treatment that may or may not work. Hope this helps...good luck.