US Patent Issued on March 18 for "Pivotal bone anchor screw with nested two-piece closure and independent locking twist-in-place insert" (Kansas Inventor)

ALEXANDRIA, Va., March 19 -- United States Patent no. 12,251,139, issued on March 18.

"Pivotal bone anchor screw with nested two-piece closure and independent locking twist-in-place 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 base defining a cavity for receiving the capture portion of a shank and a first pair of upright arms defining a first channel for receiving an elongate rod, and a pressure insert with a second pair of upright arms defining a second channel. The pressure insert is configured for initial positioning into the receiver, with the first channel and the second channel ...