 The ten year pregnancy rate is estimated at 36.5 pregnancies per 1000 procedures performed, and the ectopic pregnancy rate is estimated at 8.5 per 1000 procedures performed.This method involves a doubling over of the fallopian tubes and application of a silastic band to the tube.The ten year pregnancy rate is estimated at 17.7 pregnancies per 1000 procedures performed, and the ectopic pregnancy rate is estimated at 8.5 per 1000 procedures performed.