Where's the money going to come from?

I used to hold but sold out, seems I missed the bump but looks like there's plenty of opportunity to get back in.

Reason I sold and what I m still stuck on is how it ever becomes a massive ongoing income stream. If they sell to a hospital they will buy a machine, then they won't need anymore. It's not like a medical device where you need one per patient.

Assuming they sell to 100 hospitals a year at 10,000 per device that's still only $1m a year income? 1000 of the apparently 5000 hospitals in usa gives $10m a year. Ie it will never be more than a small cap stock?

Can anyone provide any figures based on reasonable assumptions on market penetration which show they will actually make decent coin?