In recent years, with the increasing prevalence of cardiovascular diseases and the growing demand for mechanical circulatory support devices, novel designs of ventricular assist devices (VADs) have received significant attention. These devices must not only meet the physiological requirements of the body—such as providing adequate blood flow and pressure—but also minimize blood trauma to ensure hemocompatibility. Key challenges in the development of VADs include reducing the overall device size, minimizing blood residence time within the pump, and lowering hemolysis levels. This study investigates the design of a centrifugal VAD featuring an impeller with a diameter of 38 mm, designed using the Gulich method in CFTurbo 2023 and CATIA. The impeller diameter is approximately 27% smaller than those reported in previous studies, contributing to an overall reduction in pump size and enabling its application in space-constrained environments, such as implantable heart assist devices. Two different volute configurations—single volute and double volute—were designed and compared. Computational fluid dynamics (CFD) simulations were conducted at a rotational speed of 2500 rpm and a flow rate of 5 L/min. The results of this study demonstrate that in the double volute configuration, the average shear stress decreased by 21.7% and the hemolysis index was reduced by 22.2% compared to the single volute design. These improvements indicate a more optimized hemodynamic performance and reduced blood damage in the double volute configuration, highlighting its potential for safer and more efficient ventricular assist device applications.