The problem is that both security protocols and practical considerations usually prevent the installation of unknown USB devices into our computers during the course of rendering emergency care. However, they are a great way to keep your medical records together, portable and with you.
Ditto. With the added info that in the field, someone with bloody gloves probably doesn't want to be fiddling with a keyboard. And in the hospital, there's never a free computer when you need it (docs, rn's, and the clerks all need one. Usually there's 2 or some ungodly small number free to work with).
My faves? Medicalert bracelet that directs you to a phone number (and usually has the important stuff, like med allergies and life-threatening medical conditions), a folded up paper or purpose-built card in a wallet, or worst case, a tattoo

When I get old, DNR in big bold font is going on my sternum.