Suppressing the mortality of sperm.

Intra Uterine Devices $(IUDs)$ for contraception

$(i)$ There devices are inserted by the doctors into the uterus through vagina.

$(ii)$ There are three types of $IUDs$

Non-medicated $IUDs$ They increases the phagocytosis of the sperm within the uterus, e. $g .$, Lippes loop

Copper Releasing $IUDs$ Along with phagocytosis of the sperms, the copper ions released, suppresses the sperm motility and the fertilizing capacity of the sperm. $e \cdot g ., Cu – T _{2} Cu -7$, multiload $-375$

Hormone Releasing IUDs They makes the uterus unsuitable for implantation and the cervix hostile to the sperms, e.g. progestasert, $LNG-20$