Busting Blood Clots with Sound Waves

An ultrasound device designed to produce highly focused sound waves might one day be used to break up stroke-causing blood clots in the brain without surgery or drugs. So far, the system has only been tested on clots in test tubes and animals, but researchers aim to start human tests by the end of 2011.

Clot buster: High-intensity focused ultrasound in conjunction with magnetic resonance imaging, pictured here, has the potential to pinpoint the location of a stroke-causing blood clot and break it up with sound waves. Credit: Thilo Hoelscher

Thilo Hoelscher, a neurologist at the University of California at San Diego, is attacking the clots with a device developed by Israeli ultrasound technology company InSightec. The device surrounds the head with an array of transducers that can focus ultrasound beams on a single spot in the brain without damaging the skull.
The technology is already being tested in patients to remove diseased brain tissue, but treating stroke will require a more delicate hand. Hoelscher and colleagues will need to prove that the device can break up a clot without damaging nearby brain tissue.
Strokes are the most common cause of long-term disability in the United States, and the third most common cause of death. Typically, they occur when a blood clot blocks an artery and prevents blood from flowing to the brain. The longer the clot remains, the more brain tissue dies, and the lower a person's chance for survival. "Anything you can do that's going to safely restore blood flow more quickly could have a lot of potential for societal, medical, and economic impact," says Evan Unger, a radiologist at the University of Arizona who is not involved in the research.