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The aim of our research project is to obtain parameters that determine the tension in the valve leaflets by means of theoretical and experimental modele. As shown earlier , a proper understanding of natural aortic valve closure is essential for the construction of artificial triple-leaflet valve prostheses. As Bellhouse and Talbot 2 shov the aortic valve starte to close during the deceleration phase of systole, thus preventing high tension within the leaflets at closure and minimizing blood tr ume. For an optimal design of artificial leaflet valves, Implementation of this natural ciosing mechanism could be of importance. In previous papers '" we reported on our studies on the valveclosing behaviour after a sudden deceleration of the mainstream and we presented the first results of modelstudies on the valve-closing during a gradual deceleration of the mainstream. Now, we will discuss more extensively our work on the valve closure during such a gradual mainstreamrdeceleration.

MODELEXPERIMENTS ON THE CLOSING BEHAVIOUR OF THE NATURAL AORTIC VALVE