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Knight's Mechanical Encyclopedia (ed. Knight), T. (search)
（Surgical.) e, Fig. 6647, Also known as a lenticular knife. A lever for raising the portion of bone detached by the trephine. Tre-phine′. （Surgical.) An instrument for taking a circular piece out of the cranium. It is a cylindrical saw, with a cross-handle like a gimlet and a center-pin (called the perforator), around which it revolves until the saw has cut a kerf sufficient to hold it. The center-pin may then be retired. a b, Mott's socket-handled trephine and handle. c, Galt's conical trephine. d, antrum-drill. e, trepanning-elevator. Trepang. Trephines. The trephine is sometimes worked by a revolving brace like that of the carpenter, and has even been socketed upon a stem with three legs, and turned by one hand while the socket is held by the other. The trephine for the antrum (d) is a small crown-saw set in the end of a handle. It is used for entering the antrum through a tooth-socket. Trepanning instruments were used by the ancients; Hipp<