 The Acorn CorCap Cardiac Support Device CSD is a new therapy for the treatment of heart failure that is designed to reduce left ventricular dilation, which is one of the most important pathophysiological mechanisms underlying the clinical syndrome of heart failure. The Acorn CorCap CSD is intended to reduce wall stress and support the heart, in order to prevent further dilation that is associated with progressive heart failure. It is designed to result in reduced left ventricular size and improve left ventricluar function, which should result in improved patient functional status. 