US Patent Issued on Nov. 25 for "Pivotal bone anchor assembly with forcibly downwardly displaceable pressure insert" (Kansas Inventors)

ALEXANDRIA, Va., Nov. 25 -- United States Patent no. 12,478,409, issued on Nov. 25.

"Pivotal bone anchor assembly with forcibly downwardly displaceable pressure 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 bone anchor having a proximal capture portion and an anchor portion, and a receiver having a channel for receiving a rod, an internal cavity with upper expansion and lower locking regions, and a central bore with an inwardly-protruding circumferentially-extending interference engagement structure. The assembly also includes a pressure insert having an upper sur...