Intrauterine devices, Gräfenberg rings

Circa 1930s
Intrauterine devices. Sizes 1.4 - 2.8. Gräfenberg's ring is an early IUD or birth control device originally made of a flexible ring of silk suture, later versions of which were wrapped in silver wire . Gräfenberg's ring was the first IUD used by a significant number of women. The ring was introduced by German gynaecologist Ernst Gräfenberg in 1929. It ceased to be in wide use circa 1939. The silver wire used to construct later versions of Gräfenberg's ring was contaminated with copper, which increases this spermicidal effect.
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