B. Kostrzewa

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Artificial heart valves can be classified into mechanical and biological. We have three types of mechanical heart valves: caged ball, tilting disc and bileaflet. Mechanical heart valves are made from various materials. They may be produced from metals, ceramics and polymers, e.g.: stainless steel, titanium, silicone, pyrolytic carbon. Biological valves are(More)
Venous diseases seem to be a large social problem. Chronic venous insufficiency, which is the most well-known venous disease, can be caused by high blood pressure in veins. The increase in pressure may cause the vein wall weakness and may even lead to damage venous valves. There are many different methods of treatment of chronic venous insufficiency:(More)
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