Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Externally threaded fastener element – e.g. – bolt – screw – etc. – Thread or shank structure
Patent
1994-02-24
1996-02-20
Wilson, Neill R.
Expanded, threaded, driven, headed, tool-deformed, or locked-thr
Externally threaded fastener element, e.g., bolt, screw, etc.
Thread or shank structure
411411, 411308, 411310, 606 73, F16B 3504, F16B 3930
Patent
active
054924421
ABSTRACT:
A bone screw having a helical thread with a constant outside diameter and curling around a tapered core. The fine screw tip and thread at the tip of the screw can be inserted into a bone with minimal tearing or cracking of the bone. The thicker core just below the screw head increases the screw's ability to withstand compressive and distractive loads. The core is thickest just below the head because it is at that point on the screw that the fulcrum loads are greatest.
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SOFAMOR "The Spine Specialist" promotional material and photocopy of a bone screw.
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National Medical Specialty, Inc.
Wilson Neill R.
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