Bi-fed offset pitch bone screw
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United States of America Patent
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Oct 10, 2000
Grant Date -
N/A
app pub date -
Feb 10, 1999
filing date -
Feb 10, 1999
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A bone screw annd assembly are described wherein the bone screw has a dual lead thread that is provided as an offset thread. The bone screw has two leads starting less than 180.degree. apart. Because the leads start less than 180.degree. apart, the leads appear to spiral together along the shaft of the bone screw, creating a large groove and a small groove. The offset dual lead thread of the present invention provides enhanced pullout resistance by overcoming machining limitations to produce a bone screw with increased thread depth while maintaining or decreasing thread pitch. The bone screw may also be provided together with a bone plate to comprise a bone fixation assembly.
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