Figure 2
From: The design, development, and evaluation of a prototypic, prosthetic venous valve
Geometric relationships and frame design equations in the transverse plane. Equation 1 is represented on the left where it is the goal to match the valve circumference (green) to the closure path (red). Equation 2 is represented on the right where the objective is to compensate for the flat flange back and tangent point. When solved simultaneously, the system provides a solution for both the flange radius, r, and Q where the valve radius, R, is the independent parameter.