The present invention comprises a medical device having a support structure made from alternating layers. One or more layers may be made by direct metal laser sintering. One or more layers may be made by introducing nitrogen into a previously formed layer via excimer laser nitriding....http://www.google.se/patents/US20080131479?utm_source=gb-gplus-sharePatent US20080131479 - ENDOPROSTHESIS WITH THREE-DIMENSIONAL DISINTEGRATION CONTROL
