Anterior spinal polyaxial locking screw plate assembly having recessed retaining rings
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Mar 2, 1999
Issued Date -
N/A
app pub date -
Mar 29, 1996
filing date -
Apr 13, 1995
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
The present invention is a polyaxial locking screw plate assembly for immobilization of vertebral bones, via fixation to surfaces thereof. The assembly includes a plate, having an upper portion and a lower portion, each of which has a pair of tapered holes, into which holes coupling elements and bone screws may be inserted. The upper part of the holes further includes an annularly recessed channel in which a snap-ring is disposed. The coupling elements each have an axial taper which matches the taper of the holes, and an interior semi-spherical concave surface in which the semi-spherical head of a bone screw may be polyaxially mounted. The bone screws are inserted through the holes until the coupling element engages and expands the snap-ring. Once the coupling element is fully seated in the hole, thereby locking the screw in place and the coupling element in the hole, the snap-ring contracts to its undeflected position and prevents the coupling element and screw from backing out of the hole in the event of loosening.
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Family
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