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Parametric design of leaflet and stent base, from (a) circumferential and (b) radial perspectives. Valve parameters defined; lf: leaflet free edge; Rb: radius at base; Rc: radius at commissures; β: angle of stent to the vertical; x: coaptation height; θ: angle of free edge to the horizontal; H: valve height; Hc: height of the commissural region.
