Various surgical engines have been devised during the last thirty years for bone surgery, usually made after the form of one of the dental engines. The two principal modifications are known as the cable-shaft engine and the cord engine. The cable-shaft engine is not suitable for bone surgery whether it be for light work as in the nose or heavy work as in craniotomy. The rigidity of this engine will not allow the cutting parts to be carried in the direction desired. The vibration caused by the cable destroys the delicate touch in the hand; then there is what is known as "back lash."
The arm of the cord engine (Fig. 1) is fashioned very much like the human arm and wrist. It has the shoulder, the arm, the elbow, the forearm and wrist, at which point the hand-piece is attached, which can be easily detached for quick change of
CRYER MH. THE SPIRAL OSTEOTOME DRIVEN BY A SURGICAL ENGINE IN CRANIOTOMY. JAMA. 1908;LI(14):1150–1152. doi:10.1001/jama.1908.25410140032004
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