A vaso-occlusive system comprising a catheter with a working end that carries a fluid media for introduction into an aneurysm. The fluid media carries a volume of microspheres, wherein each microsphere has a sacrificial shell or coating that surrounds an interior core portion of the microsphere. The...http://www.google.ca/patents/US6958061?utm_source=gb-gplus-sharePatent US6958061 - Microspheres with sacrificial coatings for vaso-occlusive systems
