Prosthesis (i.e. – artificial body members) – parts thereof – or ai – Implantable prosthesis – Bone
Patent
1997-01-06
1999-12-21
Milano, Michael
Prosthesis (i.e., artificial body members), parts thereof, or ai
Implantable prosthesis
Bone
606 61, 606 72, 606 73, 411 3, 411 5, 411393, A61F 244
Patent
active
060043490
ABSTRACT:
An improved set screw, for use in an osteosynthesis apparatus to secure and fix the spinal rod in the bore of the head of a bone screw, hook, connector or the like from translational or rotational motion, which comprises a head of hexagonal external cross-section and a lower portion having a threaded outer surface. A point is centrally formed on a lower surface of the set screw for penetrating into the rod and the point is preferably surrounded by a spaced and sharpened ring. In some embodiments a peripheral notch is formed between the head and the lower threaded portion of the set screw. A cylindrical bore comprising an upper bore section and a lower bore section is formed in the set screw such that the upper bore section extends through the head and the lower bore section extends partially through the set screw lower portion. The set screw functions in an embodiment with a cap to provide multiple points of contact with penetration into a first member to secure the first member to a second member associated with the cap in a relatively very stable system.
McMahon John C.
Milano Michael
Nguyen Tram A.
LandOfFree
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