Self-limiting set screw for use with spinal implant systems
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United States of America Patent
Stats
-
Dec 16, 1997
Grant Date -
N/A
app pub date -
Oct 18, 1995
filing date -
Oct 18, 1995
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The invention relates to a set screw having a self-limiting external torque head. The head has a hexagonal external cross-section and an internal bore which extends through a necked portion. The necked portion joins the external torque head to the threaded screw portion of the set screw. The necked portion has a cross-sectional thickness and strength to provide for shearing at a predetermined load limit, such as from about 54 to about 64 pounds per inch. The threaded screw portion has an internal hex to allow for the internal application of loosening torque at about two-thirds of the tightening torque limit, i.e., to provide a loosening torque of about 40 inch-pounds. The screw member includes a high-compression, rod-contacting surface such as a knurled surface.
First Claim
Family
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Cited Art Landscape
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