Millions of women start using an IUD because doctors tell them that an IUDs are safe, effective and long-lasting. Unlike the pill, vaginal ring or the contraceptive patch, IUDs are fit and forget methods. In many women, this statement is true. Many women are happy with their IUD and don’t complain. However, about 50 to 60% have their IUD removed long before the usual 5-year lifespan of the IUD. Early IUD/IUS removal is frequent due to side effects, mostly bleeding and pain, because the uterus, like any organ, cannot tolerate a foreign body that is cumbersome for long periods of time. Young women are specifically vulnerable to side effects. They are also the most vulnerable to unintended pregnancy and this is precisely why many organizations and institutions advocate IUDs in order not to become pregnant unintendedly. However, early IUD discontinuation undermines their potential to prevent unintended pregnancy and has numerous drawbacks as many women switch to other, less effective methods or to no method at all. Continuation over time is the primary determinant of effectiveness for IUDs. As researchers, active in the field of intrauterine contraception since several decades, we have tried to maximize continuation of use by designing non-hormonal and hormonal intrauterine devices that accommodate to every anatomically normal uterus. Frameless devices are small; they are flexible as they have no frame; they provide highly effective and well tolerated contraception simply because they fit. Embedment, a frequent complication of current, framed IUDs, is not possible if the frameless IUD as the uterine contractions have no impact on the flexible body and can therefore not be forced in the uterine wall. However, frameless IUDs need to be attached to the uterus to prevent expulsion. Precisely how correct anchoring is accomplished, including the pitfalls, and how to check the correct position of the anchored IUD is the subject of this paper.
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