Contraception through the use of intrauterine metals. I. Copper as an adjunct to the “T” device: The endouterine copper “T”☆

Abstract Clinical evaluation of the contraceptive effectiveness of the endouterine copper “T” has been extended to include “T” devices bearing copper wire having surface areas of 120 mm. 2 and of 200 mm. 2 copper, respectively. Within the range studied, the antifertility effect increases as the area of the exposed surface of copper is increased. At the end of one year, the TCu-120 resulted in a pregnancy rate of 2.0 per 100 users and a continuation rate of 94.1 per cent. Results from 7 months of observation with the TCu-200 showed a pregnancy rate of zero and a continuation rate of 98.3 per cent.