title: The "nylon T" intrauterine device: surface area versus copper adjunct.
abstract: A study to evaluate the relative effect of copper ions and increased surface area added through the wiring of the stem of the inert "T" device was performed. The experimental design was set up to test a hypothesis that the effectiveness of a copper device is a result of the increase in surface area of the IUD and not a result of the copper itself. Ninety-eight TCu 200 mm2 devices were stripped of their copper wire and rewound with a "nylon" thread of the same length, caliber and surface area. the devices were then repacked and gas sterilized. The 98 "nylon T" devices were fitted early in 1977 and followed up for 2 years. The major finding was that the replacement of copper wire on the "copper T" device by a "nylon" thread, "nylon T", had shown a comparable antifertility effect.
mesh_terms: D000328:Adult; D005069:Evaluation Studies as Topic; D005260:Female; D006801:Humans; D007047:Hysterosalpingography; D007434:Intrauterine Devices; D007435:Intrauterine Devices, Copper / Q000009:adverse effects; D009757:Nylons; D011247:Pregnancy; D012306:Risk
chemical_list: D009757:Nylons