Surgery – Instruments – Orthopedic instrumentation
Reexamination Certificate
2006-02-21
2006-02-21
Philogene, Pedro (Department: 3732)
Surgery
Instruments
Orthopedic instrumentation
C606S075000, C606S064000
Reexamination Certificate
active
07001389
ABSTRACT:
A locking screw assembly is provided which allows installation into a plate-like member using relatively little force, but which requires relatively great force for removal. The fastener has an annular locking ring provided within a groove in the head of the screw to allow the screw to sit within or flush with the anterior surface of the plate. The through-hole in the plate which receives the locking screw comprises an entrance, a collar section, an undercut, and an exit. The locking ring resides within the undercut. The locking ring has a leading surface that is chamfered or radiused and a trailing surface that is flat. The chamfer allows the locking ring to easily be inserted into the through-hole by interacting with a lead chamfer in the entrance. After installation, the flat trailing surface abuts a lip adjoining the collar section and the undercut and prevents the screw from being easily removed from the through-hole.
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Albert Morton B.
Madigan Dennis M.
Navarro Richard R.
Theken Randall R.
Eichenberger Robert H.
Middleton & Reutlinger
Philogene Pedro
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