A venous valve is bicuspid (obtaining two leaflets) which is shaped by an infolding of part of the tunica intima on either side of the lumen with the veins. The leaflets are strengthened with collagen, and elastic fibres, and protected with endothelium.[ten] The endothelial cells around the surfaces from the http://sgvascularctr.com/understanding-venous-leak-treatment-in-singapore/