[Ultrasound localization of intrauterine contraceptive devices in the laboratory and in patients (author's transl)].

Three frequently used IUD's were studied in model experiments by ultrasound. The position of the IUD in the uterine cavity can be best outlined by longitudinal and transverse ultrasound section of the uterus in the anteflected or retroflected position. Only rarely can the position of the IUD be properly visualized if the uterus is in middle position and the applicator placed transversly. There is the possibility of misinterpretation of the string as an IUD. The data correlate well with ultrasound results of women wearing an IUD.