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In page Artificial heart:
"Since 1991, the Foundation for Cardiac Surgery Development (FRK) in Zabrze, Poland, has been working on developing an artificial heart. Nowadays, the Polish system for heart support POLCAS consists of the artificial ventricle POLVAD-MEV and the three controllers POLPDU-401, POLPDU-402 and POLPDU-501. Presented devices are designed to handle only one patient. The control units of the 401 and 402 series may be used only in hospital due to its big size, method of control and type of power supply. The control[1] unit of 501 series is the latest product of FRK. Due to its much smaller size and weight, it is significantly more mobile solution. For this reason, it can be also used during supervised treatment conducted outside the hospital.[citation needed]
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