The first IUDs were developed at the beginning of this century,
although widespread acceptance has only occurred in recent decades.
Modern IUDs have been used widely since the 1960s and have been
modified and redesigned to improve their safety and efficacy.
As this slide shows, IUDs have been developed in various shapes
and sizes and made from various types of materials, including
plastic and stainless steel. Many women continue to use some
of these older devices successfully, such as the Lippes Loop
and the Chinese stainless steel ring, with some remaining in
place until menopause.