Could you contact an organization such as Doctors Without Borders and get in with them?
One organization that has been working there for decades is Plan Canada. They've already got people and facilities in place, so they might be well equipped to use your services. Here's their website:
http://plancanada.ca/
(I'm sponsoring a Haitian kid through them, and I sure hope she's okay.)
Check your local airport to see if Westjet (a Canadian airline) stops there. They've been donating flight time to get supplies and people in to Haiti. There may be other airlines doing this as well.