You can obtain a copy of IEC 60601-1:2012 from the IEC website or from a national standards body.
: This standard applies to medical electrical equipment that is intended to diagnose, monitor, or treat patients. Iec 60606 Pdf
IEC 60601-6 is not a valid standard, I believe you are referring to IEC 60601-1 or other parts of the IEC 60601 series. However, I'll provide a general guide on the IEC 60601 series, which is a set of standards for the safety and performance of medical electrical equipment. You can obtain a copy of IEC 60601-1:2012