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A diaphragm is a barrier method of contraception: a small rubber dome filled with a spermicidal (sperm killing) cream and placed in the vagina to wall off the cervix, thus preventing sperm from entering.
It is different from cervical caps, which are smaller and placed directly over the cervix.
Both must be initially fitted by a health care provider. They are inserted before sexual intercourse and have to remain in the vagina for 6 hours after the act.