Polyaxial bone screw

Details Polyaxial bone screw Polyaxial bone screw

2009-04-06

2011-10-11

Barrett, Thomas C. (Department: 3775)

Surgery

Instruments

Orthopedic instrumentation

C606S266000, C606S267000, C606S306000

Reexamination Certificate

active

08034087

ABSTRACT:
A polyaxial bone screw assembly includes a threaded shank body having an upper capture structure, a head, a retaining ring and a nut. The external capture structure surface includes a threaded portion and a smooth portion; the smooth portion for slidably mating with the retaining ring and the threaded portion for rotatable attachment to the nut within a cavity of the head. The nut fixes the retaining ring to the shank and also provides a tool engagement formation for driving the shank body into bone.

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