How do cervical caps work?
The cap is placed inside the vagina to cover the cervix. Suction keeps the cap in place. A cervical cap provides a barrier to block sperm from entering the uterus and prevents fertilization. A cervical cap is used with spermicidal jellies or creams, placed inside the cap, that kill sperm to increase the effectiveness. The spermicide acts by killing and immobilizing the sperm, preventing any stray sperm from fertilizing the egg. The cervical cap must be left in place for at least six hours after last intercourse before removing.