I don't think companies should be allowed to sell products like this (requires invasive surgery, long term maintenance, more invasive surgery if something goes

I don't think companies should be allowed to sell products like this (requires invasive surgery, long term maintenance, more invasive surgery if something goes wrong) directly to patients. They need to sell to the government/health insurance companies, and provide all the tools/training/equipment for those organizations to do the long term support for patients.