Apparently there’s an upcoming “680” variant that is “specifically designed to meet ISO 10993 medical grade requirements”. Pretty cool!
http://www.3ders.org/articles/20130218-3d-printing-bone-replacements-cartilage-replacements-medical-devices-with-618-nylon.html
Nice, I was just about to post this. Nothing long with a little shameless self-promotion on my part, right?