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The Ypsilon intrauterine device (IUD), which consists of stainless steel covered with silicone rubber, was studied in 209 women. In the 3,169 woman-months of use, there were 21 pregnancies, nine expulsions, and in 24 instances the Ypsilon IUD was removed for medical reasons (side effects). The net cumulative pregnancy rate in the 12 months after insertion was 6.4% and the expulsion rate was 3.8%; the medical removal rate was 9.0%. No perforations or tubal pregnancies occurred. The comparatively low medical removal rate renders the Ypsilon IUD a fairly good device for clinical use, although the pregnancy rate is rather high.
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