Three-dimensional visualization reconstructed from scanned human data. Anterior view of female pelvis and reproductive organs, showing proper placement of a contraceptive ring within the vagina. A contraceptive ring is a female hormonal contraceptive device that is inserted into the vagina; it releases hormones that stop the ovary from releasing an egg, so that pregnancy does not occur. It also causes the cervical mucous to thicken, making it more difficult for sperm to enter the uterus, and changes the lining of the uterus, preventing implantation of a fertilized egg. The contraceptive ring is only available with a prescription. When used correctly, it has a failure rate of 1 - 2%. It offers no protection against STDs.

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