An interauterine device provides long-term birth control. iStockphoto hide caption

itoggle caption iStockphoto

The ParaGuard IUD, which releases copper into the uterine cavity, can last up to 10 years. In clinical studies, the pregnancy rate among women using the device was less than 1 pregnancy per 100 women annually. Mark Harmel/Science Source hide caption

itoggle caption Mark Harmel/Science Source