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Bone screw

  • US 4,854,311 A
  • Filed: 01/21/1988
  • Issued: 08/08/1989
  • Est. Priority Date: 01/09/1986
  • Status: Expired due to Term
First Claim
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1. A bone screw for use in connecting a bone portion with a connecting member, said bone screw comprising:

  • a mounting section disposed at a first end portion of said bone screw for engaging the bone portion; and

    a connector section disposed at a second end portion of said bone screw for use in connecting said bone screw with the connecting member;

    said mounting section including an external mounting thread convolution having a root portion, a crest portion, a leading flank surface extending between said root and crest portions and facing forwardly in a direction away from said connector section, and a trailing flank surface extending between said crest and root portions and facing rearwardly in a direction towards said connector section, said root portion having an arcuate cross sectional configuration in a radial plane containing the longitudinal central axis of said bone screw, said trailing flank surface sloping rearwardly and outwardly from said root portion to said crest portion, said crest portion of said mounting thread convolution being offset rearwardly of the forwardmost portion of said trailing flank surface by a distance which is less than the radius of curvature of the arcuate root portion of said mounting thread convolution to form a rearwardly facing recess between said crest and root portions of said mounting thread convolution and to form a wide space between adjacent turns of said crest portion of said mounting thread convolution through which bone may project radially inwardly into the space between adjacent turns of said mounting thread convolution on opposite sides of a radial plane extending through the center of curvature of said root portion and perpendicular to the longitudinal central axis of said bone screw to form a solid mounting for said bone screw in the bone.

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