Surgery – Instruments – Orthopedic instrumentation
Reexamination Certificate
2006-02-16
2011-12-13
Barrett, Thomas C. (Department: 3775)
Surgery
Instruments
Orthopedic instrumentation
Reexamination Certificate
active
08075604
ABSTRACT:
A bone screw comprising a threaded shank including a distal end portion and a proximal end portion, and defining a first threaded section extending from the distal end portion toward the proximal end portion and adapted for anchoring in cancellous bone, and a second threaded section extending contiguously from the first threaded section toward the proximal end portion and adapted for engagement in cortical bone, with the second threaded section having a finer thread pattern relative to the first threaded section. In one embodiment, the first threaded section includes a first helical threading defining a single lead thread pattern for anchoring in cancellous bone, and the second threaded section includes a second helical threading interleaved with the first threading to define a duel lead thread pattern for engagement in cortical bone. In a further embodiment, the bone screw includes a head portion extending from the threaded shank and configured for coupling to a spinal implant.
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Denis Francis
Garvey Timothy A.
Perra Joseph H.
Pinto Manuel
Rezach William A.
Barrett Thomas C.
Boles Sameh
Warsaw Orthopedic Inc.
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