As a responsible hospital, I will have to ensure your software will work 99% of the time and that if anything goes wrong you'd be paying the loss. That's a dangerous field to get into.
That's one of the reasons why it matters so much that the guy is actually a doctor. Not only does he have technical expertise in the target domain, he already knows what's going on with safety regulations, liability insurance and suchlike.
Yea, it's an messy area to start a company in. I'm trying to learn how to cover my bases as I go along but if I'm paralyzed by fear forever I'm not going to move forward.