How is terphination done????

Question

I am doing a report on trephination and i cant find anything on how terphination is done nowadays i can find how it was done in the neolithic age though but i need how the surgery is done today
thank you for your help

Answer 1

I am a surgeon and have seen a carpentry drill thingy that has a circle with teeth and a drill in the center. This way you can make a large hole, say in a skull or pelvis and replace it when you are done with your work.
We use it in non-cranial bone work so the the diameter is about one cm without the central drill; we make boney plugs to fill up bone space or to fuse a bone: to do this, we center the trephin over the joint and go through and through. Instead of taking the plug out, we rotate it 90 degrees so that the joint fuses in place without having to use pins or screws, though some of my colleagues still do use pins.

Answer 2

Here is a picture:
http://www.geocities.co.jp/Technopolis/1264/BurrHole.jpg

The clips are keeping the skin edges of the scalp from bleeding. That is a power drill cutting a hole in the skull.