"ClotBust" and other ultrasound tools being tested can break up blood clots in the brain after a stroke. The Popular Mechanics story gives hope these tools will soon be available. ClotBust and EkoSonic fire ultrasound from many directions to super-activate the clot-dissolving drug tPa
when it arrives at a clot site. A third tool, ExAblate Neuro relies on ultrasound alone, converging from thousands of directions to zap the clot directly. A 40% clear-up rate is being reported for ClotBust in the first couple hours after application.