Numerical and experimental studies of physiologic flows in the coronary  bridgings.   (cf. A4, A5, A7, A18, A19, A21, C7, C16, C17, C30, C31, C43, C44) The middle or long term results in coronary surgery show non-negligeable rates of restenosis (38% of failure for the venous graft; 15 to 28% for an arterial graft; only 46% of the grafts viable after 20 years). The geometric and hemodynamics configurations of bridging do not seem to be always optimized. During the first weeks of action of a coronary bridging, clinical studies have show that a non-neglectable flow could exist in the stenosed coronary. However, no study takes the geometrical shape of a stenosis into account, as the flow coming from the sick coronary is commonly represented in the litterature by a simple debt reduction, or even a total occlusion. To the reduction of debt is actually added the dynamics of a jet coming from the contriction. Numerous in vitro or in vivo studies realized in models of bridging have shown three important areas of important risk : the point, the heel and the floor of the receiving artery. the interaction between the jet and the junction flow coming from the graft cannot be neglected and the recirculation zone downstream from the stenosis has a strong influence on the distribution of the parietal friction. Within a thesis work (D6), a numerical and experimental study were conducted in that direction, for physiological flows, and in models of anastomose representing a stenosed coronary.