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Contraceptive vaginal ring is a type of insert that is placed in the vagina for the purpose of birth control.
A number of types exist. One type is the ethinylestradiol/etonogestrel vaginal ring, also known as NuvaRing. It is a flexible plastic (ethylene-vinyl acetate copolymer) ring that releases a low dose of a progestin and estrogen over three weeks. It is currently used by approximately 1.5 million women worldwide.
A progesterone vaginal ring has also been developed. It is specifically made for use during breast feeding as it does not affect milk production.
Video Contraceptive vaginal ring
References
Source of the article : Wikipedia