Sometimes after a woman has undergone sterilization by tubectomy she may either lose her children or want  to remarry and have children by her new husband.  In such instances it is possible to recanalise the tubes  by way of tubal microsurgery.  Small tiny instruments are used and under magnification, the blocked ends of  the tubes are cut and the cut ends recanalised making the tube patent again.  Tubal microsurgery is also possible for women who have blocked tubes as a cause of infertility.