The biggest concept is to use technology to support the existing dr's workflow. This can vary, a lot, between different types of doctors.
The thing he most often comments upon is the text replacement feature for his office's electronic records. He can type "issued XYZ medication due to past history of .HT." and the system will automatically insert the relevant heart history information (maybe a recent test reading, etc.) into the record.
Saves him time in recording info into the patient records. That seems to be his #1 desire for better tech -- saving time. And making complete entry into the medical records is a good place to work, as it solves a frustration that already exists.
There are lot of software companies in the medical "industry" as it is. What are your interests?
I am interested in helping doctors and patients connect and track progress through web or mobile apps. Practice Fusion's upcoming API has me thinking about that.
I wrote a couple of things in med school, some of which are still in use.
There are a lot of big players in the medical marketplace.
I would think a very specific niche app of some kind would be most successfull - as in "Helping a diabetic patient report and review their glucose levels with their physician" versus "an all purpose portal where patients can review all their information with their doctors." - you an probably get great ideas from your GF as she goes through.
BTW, I would offer this unsolicited advice: have some patience with her for the next 10 years or so. Medical school can be a major stressor. She may not have time to tell you how important you are to her...
As for filling a niche, that seems to be the best route too at this time. It may sound easier to make a general, all-purpose app, but a niche will do better I think. I'll be thinking about that some more. Thanks again!