The nano composite material for intrauterine birth control device consists of nano metal particle in the content of 0.5-50 wt% and biocompatible polymer. The said nano metal particle is nano copper particle, nano copper particle, nano zinc particle and/or nano silver particle. The nano composite material of the present invention features that the controllable release of the metal ions in some regulation can avoid violent release; and that raising the content in the solution can raise the birth control effect. |