Australian women are launching a class action over the Essure contraceptive device, due to the potential for nickel corrosion to cause an allergic reaction. One woman’s device broke during surgery she was undergoing for the removal of the device, leaving shards of nickel and plastic inside her abdomen.

While 3,000 to 5,000 women across Australia use these devices, about 17 percent of women are allergic to nickel.

The women involved in the class action have expressed concern for Essure’s contraceptive product and a strong need for the device to be heavily regulated and reviewed.