Excerpt from the February 3, 1968 issue of Science News
IUDs: approval of a renaissance
In 1929, the German scientist Ernst Grafenberg inserted silver rings into the uteri of 2,000 women, and reported a pregnancy rate of only 1.6 percent. Despite this history, the use of intrauterine devices, or IUDs, was not generally accepted.… A report made public last week by the FDA’s Advisory Committee on Obstetrics and Gynecology concludes that while it doesn't know how they work, it finds IUDs to be safe and effective in blocking conception. — Science News, February 3, 1968.
Early intrauterine devices came in myriad shapes, including a double-S, loops and spirals. One IUD, the spiked Dalkon Shield,