[IEC 60601 safety specs on page 4]

http://openbci.com/forum/index.php?p=/search&Search=60601

https://www.google.com/search?q=iec+60601-1+certfication

PS the battery power restriction should be taken seriously.  And...  There is also a class of Medical rated (60601-1 certified) external supplies and dc-dc converters manufactured. But even with a med