The transcranial magnetic stimulation industry seems very protective and greedy. I've heard that not only do practitioners have to buy the machines, they have to pay big fees to the company that makes them for each treatment applied. If that's how you're going to run your business, your patents can't expire soon enough.
It's true! Same goes for vagus nerve stimulators. The devices only work with special chips that limit their use to X number of treatments. Just another reason why I've considered going the DIY route. Under the hood, all TMS devices do is deliver magnetic pulses. Unfortunately, the specifications of those pulses are a closely guarded secret.