I believe in developing a product, especially the UI, by constantly getting feedback from the user but I'm racking my brain on how to do that for a product for

I believe in developing a product, especially the UI, by constantly getting feedback from the user but I'm racking my brain on how to do that for a product for medical professionals. I can't observe them when they are with a patient and its impossible to schedule time to get feedback, they are so overworked. My theory why the UIs of these EMRs are so awful is because of this very reason: there's no feedback loop. And I'm not blaming the doctors, they have no time.