HeartWare International, Inc. (HTWR: News ), which develops and manufactures miniaturized ventricular assist devices, said Thursday that it has agreed to buy World Heart Corp. (WHRT: News ), which has been engaged in the development of left ventricular assist devices, for consideration of US$8 million, which will be paid in shares of HeartWare common stock or cash, at HeartWare’s election. The per share merger consideration will be determined by dividing $8 million by the number of shares of WorldHeart common stock outstanding on a fully diluted basis, or about $0.29 per share at today’s fully diluted WorldHeart common stock outstanding.