ALEXANDRIA, Va., June 16 -- United States Patent no. 12,303,169, issued on May 20, was assigned to Nuvasive Inc. (San Diego).

"Bone elongating devices and methods of use" was invented by Eric Chevalier (Palaiseau, France) and William Mercier (Paris).

According to the abstract* released by the U.S. Patent & Trademark Office: "An implant includes: an inner rod having an outer surface; an outer rod in telescopic engagement with the inner rod, the outer rod having a threaded inner surface in axial slidable engagement with the outer surface of the inner rod; the inner rod and the outer rod each having an end configured for attachment to bone; a rotational actuator housed within the inner rod; and a lead screw in axial alignment with the rotati...