Portable Oxygen Concentrator for Tonya Parkerson

Hello my name is Fess Parkerson, a few years ago my wife discovered she had Pulmonary Hypertension. At this time she also had blood clots in her lungs. She is on oxygen 24 hours a day and can't go anywhere without it. She has a small concentrator that insurance got but it does not supply the amount of oxygen she needs. She pretty much has to stay at home most of the time. At home she has a full size concentrator. When she wears the portable one now her Oxygen can get in the 70s. This is very dangerous for her, so she stays at home unless she has to go to a doctor appointment. Insurance will not pay for this and we are unable to afford this concentrator. Please help so she can get the equipment she needs. Thank you.