In the implantation operation, a nail needs to be screwed on the skull to fix the electrode, and it can also be used as a reference for the electrode or the connection point of the ground wire. The screw is generally stainless steel, and the diameter is generally 0.5-1mm. It is easier to implant, and the flat head screw will have less damage and can be selected according to actual needs. Gold plating can also be selected as needed, so that it has better stability after implantation in the body, and it is not easy to corrode the skull for a long time. More importantly, its impedance will be significantly reduced which is better for grounding or recording EEG signals.
