A<unk> , also known as a craniotome, is a tool for<unk> ing simple burr holes (trepanation) or for creating larger openings in the skull. This exposes the brain and allows operations like craniotomy and craniectomy to be done. The<unk>  itself can be manually or electrically driven, and primarily consists of a hand piece and a<unk>  bit which is a sharp tool that has the form similar to Archimedes' screw, this instrument must be inserted into the<unk>  chuck to perform holes and remove materials. The trepanation tool is generally equipped with a clutch which automatically disengages once it touches a softer tissue, thus preventing tears in the dura mater. For larger openings, the craniotome is a surgical instrument that has replaced manually pulled saw wires in craniotomies from the 1980s.
Cranial drill
Awake craniotomy
Cranioplasty
Forehead lift
Surgical sealant film
Brain implant
Minimal-access cranial suspension
Suboccipital puncture