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Expandable viscous impeller pump using “cage within a cage” concept. A: Large scale model in collapsed configuration. B: same model expanded by axial compression. The outer cage serves to center the impeller and protect the vessel wall. The inner cage, covered with an elastomer, forms the rotating impeller surface. The expanded to collapsed ratio is 500%. C: Adult scale functional prototype: closed diameter 8 French, 2.86 mm; open diameter 22 mm outer cage.
