What are you specifically looking for? I used to work in a lab that was attempting to do an exoskeleton for paralyzed patients that, unlike current market options, is
1. primarily mechanical
2. low cost
3. ease of manufacturer
For any medical device, you will have to do a heap of testing before approval. There are also big factors in how much assistance you need. You can get something like a REX suit that practically walks for you, or you can get something that is assistive first and foremost.