Endologix Inc., of Irvine, Calif., has won approval from the U.S. FDA for its Alto abdominal stent graft system, the company’s next-generation Ovation system for polymer endovascular aneurysm repair (EVAR). The company plans to begin rolling out Alto initially to high-volume customers of its Ovation iX system, who are already skilled at using Ovation stent grafts.