“Varicose veins are those swollen, twisted veins you usually see on the legs and feet”, he explains. “They happen when the valves in the veins that help blood flow get weak or ...

The blood in the veins of the legs works against gravity in order to return upwards to the heart. The blood is moved up towards the heart by one-way valves in the veins. When the leg muscles contract ...

Instead of pushing the blood in one direction through the circulatory system, the valves may allow blood to flow back into ...

A series of one-way bicuspid valves prevents refluxing of blood back into the leg. As blood is ejected from the deep veins, venous pressure drops allowing blood to flow from the superficial system ...

Both varicose and spider veins result when valves designed to keep blood from running backward away from the heart and back down into the leg fail or become loose and flabby -- allowing backwash ...

For this process to occur, veins contain one-way valves that open and close, helping the blood flow against gravity toward the heart. If these valves become damaged and do not fully close ...

It is used to remove a damaged vein and prevent complications of vein damage. If several valves in a vein and the vein itself are heavily damaged, the vein (or the diseased part of the vein) is ...

from each other, release of the lower finger alone caused the veins to fill immediately from below but on release of the tipper finger they filled from above only down to the nearest valve.

Engineers at Georgia Tech developed the prosthetic vein valve shown here to help improve the lives of those suffering from a condition known as chronic venous insufficiency. Disclaimer ...