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The Dalkon Shield was a contraceptive intrauterine device (IUD) developed by the Dalkon Corporation and marketed by the A.H. Robins Company. The Dalkon Shield was found to cause severe injury to a disproportionately large percentage of its users, which eventually led to numerous lawsuits in which juries awarded millions of dollars in compensatory and punitive damages. == History == In 1970 the A.H. Robins Company acquired the Dalkon Shield from the Dalkon Corporation, founded by Hugh J. Davis, M.D. The Dalkon Corporation had only four shareholders: the inventors Davis and Irwin Lerner, their attorney Robert Cohn, and Thad J. Earl, M.D., a medical practitioner in Defiance, Ohio. In 1971, Dalkon Shields went to the market, beginning in the United States and Puerto Rico, spearheaded by a large marketing campaign. At its peak, about 2.8 million women used the Dalkon Shield in the U.S. At the time of its introduction, the Dalkon Shield was promoted as a safer alternative to birth control pills, which at the time were the subject of many safety concerns.〔(【引用サイトリンク】title=Hugh J. Davis, 69, Gynecologist Who Invented Dalkon Shield - NYTimes.com )〕 Initial reports in the medical literature raised questions about whether its efficacy in preventing pregnancy and expulsion rate were as good as those claimed by the manufacturer, but failed to detect the tendency of the device to cause septic abortion and other severe infections. In June 1973 the CDC conducted a survey of 34,544 physicians with practices in gynecology or obstretrics regarding women who had been hospitalized or had died with complications related to the use of an IUD in the previous 6 months. A total of 16,994 physicians responded, yielding 3,502 unique case reports of women hospitalized in the first 6 months of 1973. Based on the survey response rate, the CDC estimated that a total of 7,900 IUD related hospitalizations occurred during this 6-month period. Based on an estimate of 3.2 million IUD users, the CDC estimated an annual device-related hospitalization rate of 5 per 1000 IUD users. The survey also provided 5 reports of device-related fatalities, with four of these related to severe infection. One of the five was associated with the Dalkon Shield. Based on these data the CDC estimated an IUD related fatality rate of 3 per million years of use, which it compared favorably to the mortality risks associated with pregnancy and other forms of contraception. Importantly, the survey showed that the Dalkon Shield was associated with an increased rate of pregnancy-associated complications leading to hospitalization.〔(【引用サイトリンク】title=CURRENT TRENDS IUD SAFETY: REPORT OF A NATIONWIDE PHYSICIAN SURVEY )〕 By 1974 approximately 2.5 million women had received the Dalkon intrauterine device. In June of that year the Medical Director of A.H. Robins published a letter to the editor of the British Medical Journal stating that the company was aware of an "apparent increase in the number of cases of septic abortions" including 4 fatalities, but stating that "there is no evidence of a direct cause-and-effect relationship between wearing of the Dalkon Shield and the occurrence of septicemia". The letter recommended precautions including pregnancy tests for women who missed their period and immediate removal of the device in women found to be pregnant. In October 1974 a series of four case reports of septic pregnancies was published in the journal ''Obstretics and Gynecology".'' In 1975 the CDC published a study associating the Dalkon Shield with a higher risk of spontaneous abortion-related death compared to other IUDs. As many as 200,000 women made claims against the A.H. Robins company, mostly related to claims associated with pelvic inflammatory disease and loss of fertility. The company eventually filed for bankruptcy. The company's representatives argued that pelvic infections have a wide variety of causes, and that the Dalkon Shield was no more dangerous than other forms of birth control. Lawyers for the plaintiffs argued that the women they represented would be healthy and fertile today if not for the device. Scientists from the CDC stated that both arguments have merit.〔(【引用サイトリンク】title=THE SAD LEGACY OF THE DALKON SHIELD - NYTimes.com )〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Dalkon Shield」の詳細全文を読む スポンサード リンク
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