An embryo attaches to the uterine wall. Uterine wall is spongy and imbibes the embryo.At the place of contact between the embryo and uterine wall, the embryo develops villi and mother’ uterine wall develop the rich supply of vessels.

Copper T is a small T-shaped device which is inserted into the uterine wall. It releases mineral ions which have a detrimental effect on sperm motility and viability. Here chances of preventing pregnancy are 99.9%.