ALEXANDRIA, Va., Sept. 30 -- United States Patent no. 12,746,043, issued on Sept. 29.
"Pivotal bone anchor assembly having a restrained pre-loaded shank head 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 bone anchor assembly includes a receiver having a channel for receiving a rod and an internal chamber with a bottom opening, a lower region adjacent the bottom opening, and an upper region above the lower region. The assembly also includes a bone anchor with a capture portion and an anchor portion. The assembly further includes a resilient open retainer ring that is positioned and restrained i...