The U.S. Supreme Court on Wednesday ruled unanimously in favor of the medical device company Medtronic Inc. in a patent dispute over who has the burden of proof in certain infringement lawsuits.

The decision in Medtronic Inc. v. Mirowski Family Ventures reversed a ruling of the U.S. Court of Appeals for the Federal Circuit—not unusual in the ongoing relationship between the two courts over intellectual property issues. It was the first patent case to be decided this term, with five more patent cases on the court’s docket this term.