Mild Hyperbaric Oxygen After Liposuction?

My lipo surgeon (board certified in both orthopedic and plastic surgery, extensive experience) says he has seen good results with post-surgery mild hyperbaric oxygen. These are done at a medi-spa (not his office); the chamber is pressurized with air (not oxygen) at much lower pressure than a real hyperbaric chamber, and the patient breathes pure oxygen. I think each session is ~90 minutes and costs $50 when purchased in packs. Have you seen good results? Have there been any studies?