I have been doing some research on ultrasound and the charot foot, peripheral neuropathy. I do have an ultrasound machine and it helped me when I had a heel spur. I am researching if this would help the burning feet and for people with numbness. One can buy it at this site for $44.95 free shipping if you buy a bottle of the get to get it to $49. This is the least expensive that I found, https://www.tenspros.com/portable-ultrasound. Mine, I bought 8 or 9 years ago ($175) and when I get back home for Xmas, I am going to try it. I will let you know if it helps at all or not. To me it is worth a shot. https://intermountainhealthcare.org/blogs