System and method for polyaxially adjustable bone anchorage

Details System and method for polyaxially adjustable bone anchorage System and method for polyaxially adjustable bone anchorage

2008-06-12

2011-12-27

Barrett, Thomas C. (Department: 3733)

Surgery

Instruments

Orthopedic instrumentation

C606S265000, C606S300000, C606S305000

Reexamination Certificate

active

08083777

ABSTRACT:
An implantable bone anchor assembly for fixing an elongated member such as a spinal rod may include a bone anchor, a coupling head configured to receive the bone anchor and the elongated member, and a locking mechanism. The locking mechanism may provide compressive force to simultaneously fix the position of the elongated member and lock out polyaxial rotation of the bone anchor relative to the coupling head. The locking mechanism may include an engagement member with an oblique surface configured to slide along an oblique surface of the coupling head into engagement with the elongated member. The bone anchor may comprise a head portion and a threaded portion which may be coupled with the coupling head and joined together during manufacture. The assembly may further include a pin and/or a collar to retain the bone anchor. The bone anchor may be side-loaded into the coupling head.

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