One of Fraunhofer's artificial venous valves
Chronic venous insufficiency - or CVI - is a very common medical condition in which veins in the legs cannot pump enough oxygen-poor blood back to the heart. It is caused by faulty valves within the leg veins, and causes blood to pool in the legs, which can lead to edemas and even open ulcers. Typically, treatment consists of anti-inflammatory drugs and diuretics, along with the use of items such as compression stockings. Now scientists have developed a method of mass-producing artificial venous valves, that could replace the malfunctioning natural ones.