Methods and apparatuses for displaying and using a shaped field of a repositionable magnet to move, guide, and/or steer a magnetic seed or catheter in living tissue for medicinal purposes. A moveable magnet assembly and a portion of a patient's body undergoing magnetically-aided surgery are both provided...http://www.google.com.au/patents/US6157853?utm_source=gb-gplus-sharePatent US6157853 - Method and apparatus using shaped field of repositionable magnet to guide implant
