Multiload is an IUD, an intra uterine device, used for contraception. It is a small plastic rod, called stem, with two small flexible side-arms. The plastic is a mixture of high density polyethylene, ethylene vinyl acetate copolymer and barium sulphate in a weight ratio 44/36/20. A copper wire is wound around the stem. A nylon thread with two ends is attached to the bottom end of the stem.
Copper IUDs are a form of long-acting reversible contraception and are considered to be one of the most effective forms of birth control available.The type of frame and amount of copper can affect the effectiveness of different copper IUD models.The failure rates for different models vary between 0.1 and 2.2% after 1 year of use. The T-shaped models with a surface area of 380 mm² of copper have the lowest failure rates. The TCu 380A (ParaGard) has a one year failure rate of 0.8% and a cumulative 12-year failure rate of 2.2%.Over 12 years of use, the models with less surface area of copper have higher failure rates. The TCu 220A has a 12 year failure rate of 5.8%, whereas the TCu 380A has a 12 year failure rate of 2.2%.The frameless GyneFix also has a failure rate of less than 1% per year.Worldwide, older IUD models with lower effectiveness rates are no longer produced.