ALEXANDRIA, Va., March 26 -- United States Patent no. 12,257,160, issued on March 25, was assigned to ADDITIVE IMPLANTS INC. (Phoenix).

"Intervertebral spacer" was invented by John R. Ehteshami (Paradise Valley, Ariz.) and Mahyar Zoghi (Phoenix).

According to the abstract* released by the U.S. Patent & Trademark Office: "Intervertebral implant systems include spacers that may have solid and porous bodies integrally formed together as a single part. The bone-facing sides of the spacers include asymmetric lobes which may include solid and/or porous portions. Bone anchor holes may extend through the spacers and lobes, to receive bone anchors. A helically fluted bone anchor may be received in the bone anchor holes."

The patent was filed on S...