Mechanical circulatory assist devices have benefited from tremendous progress over the past decades since the first devices were introduced. Today, these devices, particularly those that have been approved by regulatory agencies for safety and effectiveness, are mostly safe and reliable, and provide a viable option for treating patients with serious heart related conditions. As in other mechanical systems, these devices require bearings to support the rotating and moving elements. This review provided a brief overview of different types of mechanical bearings and the principle design process. Some of the fundamental issues related to the potential damaging effects of wear and...