Family planning in the reorganized N.H.S. (b) Future of the clinic service.
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Biomedical subjects
Publications and source records attributed to M Elstein.
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Preliminary acceptability and reliability tests of the Dalkon Shield were done in 377 women over 17 months, amounting to 3,028 months of use. There was a 98% follow-up. The pregnancy rate of 4.7 and expulsion rate of 6.3 do not meet the claims described in initial trials by the developers of the device. Nevertheless, the Dalkon Shield seems to be an advance in intrauterine contraception since it has the advantages of a lower expulsion rate than the "first generation" inert intrauterine devices.
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Intrauterine devices containing copper were introduced into cultures of adult and fetal cells. The Dalkon shield had no apparent effect on cell growth. The Gravigard device caused inhibition of growth and an increase in copper concentration in the supranatant medium. When the latter device was transferred through a series of subcultures the rate of release of copper decreased and growth was no longer inhibited.
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