When a fertilized egg enters the uterus, the uterine lining thickens to receive the egg and start gestation. It thickens the mucus inside the cervix, preventing sperm from entering and fertilizing the egg.
This means that the area now becomes uninhabitable for sperm. However, rather than using copper ions, they work by releasing progestin into the uterus and the rest of the reproductive organs. Hormonal IUDs are inserted in the same way as copper IUDs. However, some are made without a frame and availability depends on country. Most copper IUDs are produced in the same shape as other hormonal IUDs. Copper IUDs specifically increase copper ions in the uterus which also act as a spermicide. This sets off an immune response, providing cells which destroy sperm cells and prevent fertilization. The presence of the IUD causes mild inflammation of the uterine lining. Although all types of IUD are often referred to as ‘the coil’, it is only the copper IUD which is actually coiled.Ĭopper IUDs are inserted into the uterus and have a thin string which hangs down through the cervix. Copper IUD: also known as an intrauterine device with copper, this IUD uses a coil of copper to prevent fertilization.The main type of progestin found in hormonal IUDs is known as levonorgestral. This is a group of steroid hormones which bind to the progesterone receptor and affect fertility. Hormonal IUD: also known as an intrauterine device with progestogen this is an IUD which releases the hormone group progestogen (commonly in its synthetic form and known as progestin).There are different brands which may have slightly varying standards, but the following two categories encompass them all: Before we can better understand how an IUD works, we need to know there are two main different types of IUD.
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