title: Copper 7 devices devoid of copper: implications for duration of useful life.
abstract: Two copper 7 intrauterine devices were found to be devoid of copper on removal after 55 and 63 months of use respectively. The implications of this observation are discussed in relation to data regarding the useful lifespan of such contraceptive devices.
mesh_terms: D000328:Adult; D005260:Female; D006801:Humans; D007435:Intrauterine Devices, Copper; D013997:Time Factors