Patent ID: 8029539
Filing Date: 2011-10-04
Classification: A61B

Abstract:
1. A multiaxial screw fixation system, comprising: (a) a screw having a threaded portion and a screw head portion positioned at one end thereof; said threaded portion having a first centerline axis extending therethrough and said screw head portion having a second centerline axis extending therethrough, wherein said first centerline axis and said second centerline axis are not co-axial; and (b) a retainer having a first end, a second end opposite said first end, and a bore for receiving said threaded portion so that said screw head portion may be seated therein; wherein said screw is adapted such that said retainer is able to pivot about said screw head portion in a non-symmetrical manner; said screw being adapted to permit said retainer to pivot on said screw such that an angle of movement of said retainer relative to said second centerline axis of said screw head portion is greater in a first direction compared to movement of said retainer in a second direction that is opposite said first direction; and wherein said screw comprises an intermediate portion between said screw head portion and said threaded portion; said intermediate portion being non-symmetrical about said first centerline axis.