The invention provides intrafallopian devices and non-surgical methods for their placement to prevent conception. The efficacy of the device is enhanced by forming the structure at least in part from copper or a copper alloy. The device is anchored within the fallopian tube by imposing a secondary shape...http://www.google.com/patents/US8066007?utm_source=gb-gplus-sharePatent US8066007 - Contraceptive transcervical fallopian tube occlusion devices and their delivery
