ALEXANDRIA, Va., Nov. 6 -- United States Patent no. 12,458,410, issued on Nov. 4.

"Method of assembling a pivotal bone anchor assembly with a downwardly displaceable collet insert" was invented by Roger P. Jackson (Prairie Village, Kan.), James L. Surber (Kansas City, Kan.) and Nathaniel D. Ginzton (Boise, Idaho).

According to the abstract* released by the U.S. Patent & Trademark Office: "A method of assembling a pivotal bone anchor assembly includes loading an insert into a central bore of a receiver, with the receiver having the central bore extending upward from a bottom opening to and through a first channel for receiving a rod, and the insert having an upper portion defining a second channel, opposite lateral protrusions extending ou...