US Patent Issued on July 28 for "Pivotal bone anchor assembly with bottom-loaded shank, ring retainer and twist-in-place pressure insert" (Kansas Inventor)

ALEXANDRIA, Va., July 28 -- United States Patent no. 12,690,904, issued on July 28.

"Pivotal bone anchor assembly with bottom-loaded shank, ring retainer and twist-in-place pressure insert" was invented by Roger P. Jackson (Prairie Village, Kan.).

According to the abstract* released by the U.S. Patent & Trademark Office: "A pivotal bone anchor assembly includes a receiver having a lower cavity with a circumferential groove adjacent a bottom opening, an upper first channel with a downward-facing surface formed therein below a closure mating structure, and a substantially cylindrical surface extending below the downward-facing surface with an alignment stop structure. The assembly also includes a shank having a capture portion configured fo...