| 摘要 |
A bone screw is provided having a head adapted to mate with a driver tool, and a shank formed from first and second helical threads that extend distally from the head around a core. The core defines a minor diameter which, along at least a portion of the shank, is preferably equal to or less than a thickness of the threads between the proximal and distal facing flanks. The bone screw is particularly advantageous in that the shape of the threads provides a high pullout strength, and results in a relatively small core diameter, thereby reducing or eliminating the risk of damage to the bone. The small core diameter also provides a sufficiently flexible screw with an adequate bending strength to handle forces acting on the screw, and to prevent breakage of the screw or the screw head.
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