Diaphragm or cap

A contraceptive diaphragm or cap is a circular dome made of thin, soft silicone that's inserted into the vagina before sex.

It covers the cervix so sperm can't get into the womb (uterus) to fertilise an egg.

When used correctly with spermicide, a diaphragm or cap is 92-96% effective at preventing pregnancy. This means that between four and eight women out of every 100 who use a diaphragm/cap as contraception will become pregnant within a year.

Call 0333 300 2100 for more information about sexual health and contraception in Merton, Richmond and Wandsworth.

Read more about the diaphragm/cap via the NHS Choices website