IUD contraceptive. Coloured ultrasound scan of the uterus of a woman, showing a fitted intrauterine contraceptive device (IUD) or coil. It comprises a T-shaped piece of plastic or metal that is inserted through the cervix into the womb to prevent pregnancy. It is thought to work by inhibiting the implantation of a fertilised egg. Some IUD's contain a progestogen drug that suppresses ovulation. IUD's are not as effective as the pill. Ultrasound is a diagnostic technique that sends high-frequency sound waves into the body via a transducer. The returning echoes are recorded and used to build an image of an internal structure. (KEYSTONE/SCIENCE PHOTO LIBRARY/DR NAJEEB LAYYOUS)
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