Surgery – Instruments – Orthopedic instrumentation
Reexamination Certificate
2007-04-17
2007-04-17
Robert, Eduardo C. (Department: 3733)
Surgery
Instruments
Orthopedic instrumentation
Reexamination Certificate
active
11024543
ABSTRACT:
A nested fastener and set screw combination for securing a spinal fixation rod to a bone screw includes a fastener base receivable into an open channel of a bone screw. The fastener base has a central threaded bore to receive a threaded set screw. The set screw is provided with projecting structure, such as a ring, point or dome-shaped structure, for positive engagement with the surface of a rod. Uploaded and downloaded set screw embodiments are disclosed. In an uploaded set screw embodiment, the fastener base is provided with a radially inwardly extending abutment shoulder to engage and abut the set screw, prohibiting advancement of the set screw out of a top of the fastener and allowing for simultaneous removal of the set screw and the fastener. In an embodiment, the fastener includes a break-off head that separates from the fastener when a pre-selected installation torque is exceeded.
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Brochure of Tyco/Healthcare/Surgical Dynamics on Spiral Radius 90D, Publication Date: Sep. 2001, pp. 1-8.
Araj Michael J.
McMahon John C.
LandOfFree
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