Stress Hormones and IUDs

A radio-opaque T-shaped polyethylene device containing 52mg of levonorgestrel dispersed in polydimethylsiloxane on its stem. The progestin is released at a rate of 15 mcg per day.

A T-shaped polyethylene device with 380 mm2 of exposed surface area of fine copper wire wound around its arms and stem. Barium sulfate has been added to the polyethylene frame to make the device radio-opaque. A 3-mm plastic ball is located at the base of the IUD, through which the polyethylene monofilament string passes.