Well, you won't be the first to build something users love but their employer/your customer won't be willing to buy.

Have you found the small hospital you will be selling this to? Or made a list of such potential clients?

And why would a small hospital be more willing to buy than other, bigger ones?

Maybe there's a feature or two that you/doctors have not considered useful but your clients find crucial, and you must focus on those ones more than anything else.

Maybe there's a reason almost all hospital/health-related software is bloated and sucks for anyone actually using it.

Maybe you should be spending more of your time thinking about these questions and how to answer them before spending any more money on this.

I'm not trying to stop you, just point you to what I think is the right direction. I could be very wrong here, is what I mean.