California-based Concentric Med ical has developed a tiny corkscrew to remove blood clots in the brain, the primary cause of strokes. Tested on 141 patients in experimental
settings, the device has now been approved for use in the U.S. and gives doctors another option for helping those in the midst of a stroke. And unlike clot-busting drugs, which must be used within about three hours of a stroke, the Merci Retriever, as it is called, has an eight-hour window.
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