"Conscious of the hazards inherent in the use of s, Dr Grafenberg took up the search for the serviceable IUD in the early 1920s. Whether he knew about Dr Richter's pessary remains an open question. Initially, he used star-shaped devices and coils of silkworm gut (1924). Because they were expelled too readily, he conceived the Ring IUD, made of helicoidal1y wound silver filaments, which still bears his name. He did not hesitate to publish clinical results (1928-30), thus making his invention known beyond the boundaries of his native Germany. Shortly thereafter, other European physicians added statistics, issuing an increasing number of damaging reports of pelvic inflammatory disease associated with IUD use. Gräfenberg's last presentation on the subject was in 1931 at the German Congress of Gynecology in Frankfurt. His report was denounced by virtually all leaders of German gynecology attending the congress, who branded intrauterine contraception as a medically unacceptable method of birth control. Shortly thereafter, the streamroller of the Nazi regime started poisoning the air of Germany. Jewish physicians were removed from the hospital posts and contraception was proclaimed to be a threat to the physical and mental health of Aryan women. Ultimately, the advertising of contraceptives and/or contraceptive advice became illegal in Germany and the other Axis States."