Left-ventricular assist devices (LVADs) have evolved from being a bridge to total heart transplant to forming a bridge to recovery of the heart. With this development, the process of weaning has become more important, and consequently, the operation and control of the LVADs during this process is more important as well. To evaluate the function and the assist properties of LVADs, a mock circulation, featuring the properties of the (diseased) heart and the systemic circulation may prove to be a valuable tool.

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