Multi-lobe torque driving recess and tool in particular for an orthopedic implant screw
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United States of America Patent
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-
Feb 3, 2004
Grant Date -
Apr 24, 2003
app pub date -
Oct 19, 2001
filing date -
Oct 19, 2001
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
The present invention provides a fastener, such as a screw or nut and tool designed in particular for use with an orthopedic implant system wherein the fastener has a multi-lobed torque driving recess. The recess has a central area bounded by equally spaced hemicircular grooves separated by internally projecting land having two sharp edges. The tool has a corresponding male shape, which in conjugation with the recess, is designed to achieve a controlled torque load with a minimized possibility of stripping the recess or of shearing the torque-driving tip from the tool.
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