Description Concentric Medical helps to save the center of consciousness -- the brain -- by getting the blood flowing. The company specializes in developing medical devices to remove blood clots causing strokes in patients. By restoring blood flow, its Merci Retrieval System minimizes or even reverses injury to the brain. The company markets its devices to hospitals through direct sales forces in the US, Canada, and Europe. The Merci Retrieval System, consisting of three products primarily used by neuroradiologists and other specialists, accesses the arterial system in the groin and is navigated to the blood vessels in the brain. Concentric Medical was acquired by medical device and equipment firm Stryker in 2011.