Upload shank swivel head bone screw spinal implant

Details Upload shank swivel head bone screw spinal implant Upload shank swivel head bone screw spinal implant

2004-04-05

2010-02-16

McDermott, Corrine M (Department: 3738)

Surgery

Instruments

Orthopedic instrumentation

C606S301000, C606S304000

Reexamination Certificate

active

07662175

ABSTRACT:
A polyaxial bone screw having a bone implantable shank, a head and a retaining ring. The retaining ring includes an outer partial hemispherical surface and an inner bore with radially extending channels and partial capture recesses. The shank includes a bone implantable body with an external helical wound thread and an upwardly extending capture structure. The capture structure includes at least one spline which extends radially outward and has a wedged surface that faces radially outward therefrom. The capture structure operably passes through a central bore of the retaining ring while the spline passes through a suitably shaped channel so that the spline becomes positioned above the head at which time the shank is rotated appropriately and the shank is drawn back downwardly so that the spline engages and seats in the capture recess.

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