HEMODYNAMIC DESIGN CONSIDERATIONS FOR AN IMPROVED ARTERY SHUNT PROSTHESIS.
Specifically, the matching of fluid impedances is explored as a means for producing a less thrombogenic flow of blood in vascular prostheses. A model for matching characteristic impedances in a femoral-popliteal bypass is developed. Calculations using typical compliances for the host arteries and prosthesis show that characteristic impedances are matched when the ratios of prosthesis diameter to host diameter are 2. 1 at the proximal anastomosis and 1. 8 at the distal anastomosis. These findings suggest that energy losses and wave reflections can be minimized in a vascular prosthesis if the prosthesis has a much greater diameter and geometric taper than the host vessel it replaces.