Thornhill Medical’s most recent investigational device, the RespirAct^® RA-MR™, is a computer-controlled gas blender used to provide accurate, repeatable, non-invasive control of blood gases and to stimulate vascular reactivity. It monitors blood flow responses in conjunction with diagnostic imaging techniques and is used by researchers at Johns Hopkins, Max Planck and Cedars Sinai, among 50 research institutes around the world.