Blood flow through the constricted area of a severe stenosis is similar to that through a venturi or flow nozzle. In the contraction section, the blood can accelerate to high speed. In this situation, the external pressure may be greater than the internal fluid pressure, and the artery could collapse. This collapse may be important in the development of atherosclerotic plaque fracture and subsequent thrombosis or distal embolization. We have developed an experimental model that closely approximates the arterial disease situation and performed steady and pulsatile flow experiments, and the characteristics of flow and compression concerned with the geometry and compliance of the model were discussed [1]. But we had not focused on the coronary stenosis. As the first step to develop the experimental model of coronary stenosis, the curved stenosis model was made. This paper was to examine the influence of curvature and stretch of the stenosis model on flow and collapse under pulsatile flow.

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