Formally targeting people with medical issues makes your device a "medical device" and adds extensive certification delays. If you make something that's "totally just for weekend warriors" but it's useful for people with medical issues, they.. can still use it, but since it's not being marketed as a "medical device" the onerous FDA approval process isn't invoked.

For practical examples to examine scalability of prices, consider cooling vests, a vest you wear that circulates cooler water to keep you comfy.

Weekend warrior products run around $200. I am toying with the idea of buying this or making my own to take hikes in hot weather. Strictly hobby/fun use.

"CoolShirt(tm)" products for operating room surgeons to wear under lead vests or whatever are probably more reliable, easier to autoclave, likely more durable, but cost $1500. I don't know why surgeon's need lead vests. Alien autopsies I guess.

I can't find the price for cooling machines for surgical patients but I imagine the liability insurance would triple the cost of the surgeon's clothing, maybe $4500 for a medical product? OF course most of the time patients would have an ice towel thrown on them not a wearable vest, but whatever.

Lead vests are worn to reduce radiation doses from radiological exams performed during surgery (to guide the procedure / monitor something etc.).

Daily activity assist devices dodge a bunch of those "extensive certification delays".