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The orthopedic wrench described here is a simple, light substitute for the heavy, cumbersome Thomas wrench, which weighs about three times as much and costs from four to six times as much. I designed this instrument and have used it for some time with highly satisfactory results.
It is constructed of tool steel. A three-eighths inch bar is used, although a five-eighths inch bar is stronger and will probably be necessary when great force is required. The upper jaw is 4 inches long, and is made by sharply bending the steel bar at an angle of 90 degrees. It is then machined round. The lower, or movable jaw, is machined from a 1 inch piece of steel, and may be opened for a distance of 6 inches. The hexagonal nut is tightened as the proper adjustment of the jaws is made. A piece of tubular steel is driven over the
Kurlander JJ. ORTHOPEDIC WRENCH. JAMA. 1925;84(16):1179. doi:10.1001/jama.1925.26620420001007a
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