US Patent Issued on Jan. 28 for "Modular pivotal bone anchor assembly having pre-loaded insert engageable with restrained pre-loaded expandable retainer" (Kansas Inventors)

ALEXANDRIA, Va., Jan. 29 -- United States Patent no. 12,207,847, issued on Jan. 28.

"Modular pivotal bone anchor assembly having pre-loaded insert engageable with restrained pre-loaded expandable retainer" was invented by Roger P. Jackson (Prairie Village, Kan.) and James L. Surber (Kansas City, Kan.).

According to the abstract* released by the U.S. Patent & Trademark Office: "A pivotal hone screw assembly includes a shank having a capture portion and an anchor portion, and a receiver assembly in a pre-assembled configuration that includes a receiver, a retainer, and a separate pressure insert. The receiver has a central bore with a lower chamber, with the retainer being pre-assembled and contained within a wider portion of the lower cham...