Picture yourself with an aortic aneurysm, a weak spot in the vessel that bulges outward and is in danger of bursting. Your doctor has fixed it with a stent, which is like sealing off the weak spot and putting in a new, stronger channel. But what if the stent leaks? That’s a problem that Keat Ghee Ong, an assistant professor in the biomedical engineering department, is addressing. He is devising a wireless sensor, the size of a small paper clip, that could be implanted by the stent. “It’s a good, easy and inexpensive way to scan it to make sure there are no leaks,” he says.