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  • Surgical trephines designed to make a small hole in the nasal frontal sinus by cutting and removing cylindrical sections of the front wall of the sinus through the eyebrows. These trephines are typically handheld, manual instruments consisting of a detachable hollow cylinder with a circular-saw-like edge and a handle for application of torque. Frontal sinus surgical trephines are used to facilitate drainage of infectious products and/or to locate an irrigation/drainage catheter into the sinus through the frontal wall hole.
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