 - Unsuccessful placement of the hysteroscopic sterilization system in one or both fallopian tubes. In addition, a patient will not be offered the opportunity to participate in the study if there are any conditions that would preclude attempted placement of the hysteroscopic sterilization system. These include hypersensitivity to nickel-titanium or contrast media, current or recent pregnancy within the previous six weeks, active genital tract infection, prior tubal ligation, or known congenital uterine malformation. 