The U.S. Court of Appeals for the Federal Circuit held another hearing involving a patent by Nuvasive Inc., of San Diego, for the company's Extreme lateral interbody fusion (XILF) system, during which the Federal Circuit vacated the Patent Trial and Appeal Board's (PTAB) finding of obviousness. The case isn't over yet, as the court remanded the case back to the board, where Nuvasive will have another chance to preserve the patent.