Self-limiting set screw for use with spinal implant systems

Details Self-limiting set screw for use with spinal implant systems Self-limiting set screw for use with spinal implant systems

1995-10-18

1997-12-16

Buiz, Michael

Surgery

Instruments

Orthopedic instrumentation

606 72, 606 73, 411 5, A61B 1756

Patent

active

056979290

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.

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