Unlike the spiral, the intrauterine ball has no “fixed place” that it should maintain in the uterus. Much rather, it is even allowed to shift and move. Together with its elasticity and gentle nature, these qualities constitute the IUB’s unique advantages. The intrauterine ball is neither rigid and sharp-edged like the copper coil, nor is it anchored to the wall of the uterus like the frameless IUD. That way, it can gently shift along with the movements of the uterus.

As the copper ball works according to the principle of the stent technology, it has a so-called “shape memory” and therefore always finds its way back into its flexible spherical shape.