| Abstrakt: |
A patent application by inventors Jackson and Surber introduces a pivotal bone anchor assembly for bone surgery, particularly spinal surgery. The assembly features a unique design that prevents the receiver from being removed from the shank head once connected, providing increased security and resistance to pull-out forces. The invention includes a compression insert and an expansion-only split retainer for capturing the shank head in the receiver, allowing for multiple articulations and improved spinal correction techniques. The assembly also allows for independent locking of the polyaxial mechanism, resembling a fixed monoaxial screw in some applications. [Extracted from the article] |
