In 2003, GE Healthcare acquired Instrumentarium (including its Datex-Ohmeda division), a producer, manufacturer, and supplier of anesthesia machines and mechanical ventilators. To satisfy regulatory concerns in the United States and in Europe, GE Healthcare was forced to divest Instrumentarium's Ziehm Imaging mobile C-arm business, as well as its Spacelabs patient-monitoring unit. Currently, GE Healthcare owns 80% of all anesthesia machines in the United States and 60% of the machines in the world. The former Instrumentarium business was incorporated into GE Healthcare's Clinical Systems business segment.