Start by triangulating all of your prospects (via Crunchbase, Angel List, and LinkedIn) with those angel and VC firms located in cities that do a lot of investing in the healthcare sector—e.g., San Francisco, Boulder, Nashville. Then, start connecting with founders/executives of those firms' portfolio companies and ask for intros.
Fundrx.comis a great place to start. They are focused on health care startups. If you'd like an introduction let me know.
Alumni venture group is another option. They are not healthcare focused, but do invest in healthcare.
Happy to schedule a call to discuss more and give some additional advice.
I'm a digital health founder in San Francisco. Most of my connections have come from local networking at startup health events and via accelerators. Other founders can be a good source for connections and information. Reach out. I'm happy to chat.