Least failure in sterilization occurs with:

Female tubal sterilization methods-10 year cumulative failure rates: Unipolar cauterisation – 0.75% Postpartum tubal excision – 0.75% Silastic ring/fallope ring – 1.77 Interval tubal exclusion – 2.01 Bipolar coagulation – 2.48 Hulka - clemens clips – 3.65 Note: Although unipolar cauterization has least failure rates, but is not preferred method for female steriliization as it leads to serious gastrointestinal burns.