The electrohydraulic heart has only one moving part, the reversible impeller or turbine. Blood does not go through the impeller, therefore there is not supposed to a concern with blood damage. Numerous scientists and engineers worked on the development of the artificial heart, but it was Robert Jarvik, M.D. in the Kolff laboratory who changed the TAH from a sphere to an elliptical shape allowing it to fit more easily into the chest cavity. Jarvik also added a third and fourth bladder to each ventricle creating more flexibility and durability. The addition of two extra rubber bellows allowed for more vigerous blood flow. His improvements allowed the correct amount of blood 100cc's, to circulate through the body. Jarvik also experimented with materials using polyurethane Biomar to create surfaces inside the housing which prevented blood thrombosis or clotting.
The first implantation of a Jarvik-7 Total Artificial Heart occurred December 1982. The TAH was implanted in Barney Clark by Dr. William DeVries at the University of Utah Medical Center. The highly publicized artificial heart operations brought attention to the triumphs of scientific technology its limitations,and its costs, both literal and figurative.