This article summarizes the status of left ventricular assist devices currently in the stages of bench testing, animal experiments, and pilot clinical trials. The major design features and estimate of costs for 17 devices are described under 3 major categories of indications for use: destination therapy, bridge to transplant, and bridge to recovery. A sleeved piston pump located in the aorta and a unique, magnetically suspended centrifugal pump are described in the destination therapy section. Eight centrifugal and 4 axial flow devices are listed in the bridge to transplant category, and an external cup and a very low-cost centrifugal pump with a left atrium-to-aorta circuit are described in the bridge to recovery section. The key design features of the future, which will be required for success in both the clinical and marketplace arenas, will be simplicity, safety, low-power requirements, and low cost.