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  • Surgical bone drill bits designed to perforate the cranium when held and revolved by a rotary device (e.g., a surgical handpiece). These devices typically consist of a cylindrical shank of steel or other hard metal with a uniform cross-section. They include a working end with cutting edges (e.g., usually twisted), and a notched or elongated proximal end to fit into the rotary device. Craniotomy drill bits are usually combined with dedicated hand drill attachments (known as footed attachments, devices that help provide protection for soft tissues when cutting through bones) to protect the cortex (dura mater) by avoiding penetration or damage to the membrane that contains the cerebrospinal fluid. They are used mainly to obtain openings in the cranium that facilitate aspiration of intracranial fluids using a ventricular catheter.
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