There's a cut made in the scalp; it's opened; the neurosurgeon has a template; he marks it around, and uses a dental burr to remove a piece of the cranial bone exactly the size of our device.
即是说，神经外科医生先在模板的头皮上开一个口 并且在口的周围作了标志，然后用牙钻去掉一片颅骨， 而这片颅骨的大小刚好跟我们设备一样。