The invention relates to an intrauterine device (1) including a body (2) generally having a T shape and including two flexible arms (4, 5) extending from one end (30) of a rod (3), wherein at least one outer layer of a portion of the arms (4, 5) are provided with a material (M) that contains at least silicone (S) and a copper powder (P). The material includes between 30 and 60 wt % of silicone and pure copper powder.
