Biotech's problem is the length and cost associated with FDA regulation. Anytime there are political barriers in place to prevent you from selling directly to the consumer (whether it is justified or not), it's not something you can do without heavy financial support.
The ones I know of are almost all spinoffs from academic research, where a few professors who have something that works in the lab join up with a few people from industry to work on scaling up to industrial volumes and with industrial processes: dealing with somewhat less precise and less sterilized equipment than the stuff used in a lab, getting yield rates up, automating anything that requires human babysitting, etc. They usually already have the connections they need, and aren't in a financial position where $20k would make much difference either way, so the two main YC benefits wouldn't do much in this setting.
Sometimes even traditional markets such as Healthcare could use web innovations to suite their bottom line. i.e. Health care registry, patient filing systems, etc.
By the time you have it built you're well in to the 100's of thousands of $.
Just to find the expertise is going to cost a bundle.
I work on EEG systems, and the prototype and related equipment costs less than $10k.
From what I've read, more than a few YC-backed companies get funding soon after demo day.