The appliance comprises a core wire on which is mounted a coil of radioactive material. A first proximal radiopaque coil configuration and a second distal radiopaque coil configuration maintain and locate the radioactive radiation coil on the core wire thereby assuring positioning thereof on...http://www.google.ca/patents/US5728042?utm_source=gb-gplus-sharePatent US5728042 - Medical appliance for ionizing radiation treatment having radiopaque markers 
