Bi-fed offset pitch bone screw

Details Bi-fed offset pitch bone screw Bi-fed offset pitch bone screw

1999-02-10

2000-10-10

Buiz, Michael

Surgery

Instruments

Orthopedic instrumentation

606 61, 606 71, A61B 1756

Patent

active

061297305

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.

REFERENCES:
patent: 422307 (1890-02-01), Libbey
patent: 2263137 (1941-11-01), Oestereicher
patent: 4950270 (1990-08-01), Bowman et al.
patent: 5022277 (1991-06-01), Shaffer
patent: 5261910 (1993-11-01), Warden et al.
patent: 5601553 (1997-02-01), Trebing et al.
Chapman et al., "Factors Affecting the Pullout Strength of Cancellous Bone Screws," J. Biomechanical Eng., Aug. 1996, vol. 118 (pp. 391-398).
"Fasteners, Materials, and Forming Processes," p. 168, (source and date unknown).

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