A ventricular assist device includes a pair of valved conduits and a pumping portion connected by these conduits into the circulatory system of a host patient. The pumping portion and valved conduits are constructed and configured to minimize the number of material-surface transitions which blood must...http://www.google.de/patents/US6102845?utm_source=gb-gplus-sharePatent US6102845 - Ventricular assist device with minimal blood contacting surfaces
