Prevention of pregnancy is called contraception. The techniques used in preventing the occurrence of pregnancy are called contraceptive devices.
Mechanical Barrier Methods of Contraception :
It is tubular latex sheath which is worn over the male copulatory organ or penis during sex.
Cerival cap :
It is rubber nipple that is fitted over the cervix.
It is tubular rubber sheath with flexible metal or spring ring at the margin which is fitted inside vagina.
Intrauterine Contraceptive Devices (IUCD or IUD) :
They are devices made of plastic, metal or a combination of the two which is inserted into uterus to prevent contraception generally through excessive secretion of cervical mucus. The most common type is copper for preventing implantation. It is functional for 3-5 years.