High Quality Content by WIKIPEDIA articles! A copper IUD (ATC G02BA) (also intrauterine device, IUD, copper-T, or coil) is a type of intrauterine device. Most IUDs have a plastic T- or U-shaped frame which is wrapped in copper wire, with the exception of Gynefix, which is a plastic string with several copper beads, affixed to the fundus of the uterus. The device has to be fitted inside and removed from the uterus by a doctor or qualified medical practitioner. It remains in place the entire time pregnancy is not desired.