Polyaxial locking screw plate assembly

Details Polyaxial locking screw plate assembly Polyaxial locking screw plate assembly

2007-09-07

2011-11-01

Ramana, Anu (Department: 3775)

Surgery

Instruments

Orthopedic instrumentation

Reexamination Certificate

active

08048131

ABSTRACT:
A bone fixation screw includes a threaded screw shank and a screw head having upper and lower ends. The screw head lower end is secured to a proximal end of said screw shank. The screw head has substantially frustospherical shaped side surfaces and is split into segments at one of the ends. The head is radially expandable at the one end. An expansion screw is centrally received in the screw head. An interface between the expansion screw and the screw head forms a cam mechanism for expanding the screw head upon axial rotation of the expansion screw.

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