The doctor hopes to block Apple from using the atrial fibrillation detection method without paying royalties. We’ve asked Apple for comment, although it doesn’t typically comment on lawsuits.

Apple is no stranger to patent lawsuits, although those frequently come from trolls that either didn’t develop a given piece of technology or have no intention of putting it into a real product. This is different — Wiesel is clearly the inventor. Still, he may face a challenging court battle. He’ll have to show that Apple’s technique is highly similar, and not just vaguely familiar-looking.