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  • Trephine blades designed to cut and remove circular sections of skull tissue during surgical procedures. Skull trephines usually includes two hollow cylindrical blades; the external cutting blade has a circular-saw-like working edge and the internal blade at the center is used for guiding purposes. Some trephines have detachable blades and a manually operated (i.e., a hand brace) or power (e.g., electrical) rotary handpiece. Skull surgery trephine blades are used to open small holes in the cranium for insertion of catheters and/or encephaloscopes for diagnosis or treatment purposes.
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