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US 2013/0296948 A1Published application
Offset multiaxial or polyaxial screw, system and assembly
AssigneeX-spine Systems, Inc.
InventorDavid Louis Kirschman
Life of this patent
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Abstract
A capless multiaxial screw fixation assembly, including a screw having a threaded portion and a screw head portion positioned at one end thereof and a retainer having a first end, a second end opposite the first end, and a bore for receiving the screw threaded portion so that the screw head portion is seated therein. At least one of the screw and the retainer is configured such that the retainer is able to pivot about the screw head portion in a non-symmetrical manner.
Claims12
A multiaxial screw fixation system, comprising:
- (a) a screw having a threaded portion and a screw head portion positioned at one end thereof;
- 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.
1 more element
A multiaxial screw fixation system, comprising:
- (a) a screw having a threaded portion and a screw head portion positioned at one end thereof;
- 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 head portion comprises at least one of a partial opening or partial shape that interfaces or connects with a tool, wherein said at least one of said partial opening or said partial shape is offset from an axis of said threaded portion.
1 more element
Dependencies are inferred from the claim text.