US Patent Issued on Aug. 5 for "Pivotal bone anchor assembly with retainer pre-positioned in expansion chamber and tool-deployable insert" (Kansas Inventors)

ALEXANDRIA, Va., Aug. 6 -- United States Patent no. 12,376,886, issued on Aug. 5.

"Pivotal bone anchor assembly with retainer pre-positioned in expansion chamber and tool-deployable insert" 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 bone anchor assembly includes a receiver defining a central bore with a circumferentially-extending horizontal interference structure located above an upper expansion region and a lower locking region, and a shank having an upper end portion up-loadable into the central bore through a bottom opening. The assembly also includes a retainer having an upper portion and a lowe...