The Dalkon Shield — A Faked IUD That Killed Seventeen and Wrote Device Law

When the A.H. Robins Company pulled the Dalkon Shield from the U.S. market on June 28, 1974, the gap between what its inventor Dr. Hugh J. Davis had promised and what the device delivered was already measured in dead women: Davis had published a February 1970 study claiming a 1.1 percent pregnancy rate — comparable to the contraceptive pill and better than rival IUDs then quoting 2 to 3 percent — while concealing that he held a financial stake in the product, had followed roughly 640 patients for an average of only 5.5 months, told many of them to use backup contraception during the early cycles, and dropped non-compliant women from the count. Properly designed studies later put the real failure rate at 5 to 10 percent. By the time Robins acquired the device for $750,000 plus royalties in June 1970 and began mass-marketing it in January 1971, the wonder-IUD legend was built on a number its own inventor had manufactured.

The harm was not contraceptive failure alone. The Shield’s distinguishing feature — a multifilament Supramid removal string sheathed in nylon — acted as a wick, drawing bacteria from the vagina past the cervix into the sterile uterus. Women who conceived with the device in place frequently miscarried in the second trimester via septic abortion, an infected and sometimes fatal mid-pregnancy loss; survivors of pelvic inflammatory disease were often left with scarred fallopian tubes and permanent sterility. Roughly 4.5 million units were sold across 80 countries before withdrawal, about 2.5 million of them in the United States. At least seventeen American women died, and hundreds of thousands suffered PID, ectopic pregnancy, or infertility — a casualty pattern with no precedent in modern contraception.

Robins did not recall the devices already inside women’s bodies, and continued overseas distribution after halting U.S. sales. Litigation — not regulation — forced the truth into the open: discovery in cases tried before federal judges Miles W. Lord in Minnesota and later Robert R. Merhige Jr. in Virginia exposed internal memos showing the company had grounds to know of the wicking defect by 1971 and buried them. Facing a litigation tide it could not absorb, Robins filed for Chapter 11 bankruptcy in August 1985. Judge Merhige fixed its liability at $2.475 billion, funded by acquirer American Home Products into the Dalkon Shield Claimants Trust, which processed roughly 200,000 claims. The episode became the proximate political fuel for the 1976 Medical Device Amendments — the first U.S. law to require pre-market review of medical devices — making the Dalkon Shield the catastrophe that wrote the rulebook it had evaded.