Eccentric roller type total artificial heart creating interatrial shunt.
Creating an interatrial shunt to achieve left-right flow balance and modification of the blood chambers to improve the basic performance of the device were performed in developing an eccentric roller type total artificial heart (ERTAH). Smaller blood chambers reduce friction loss and increase durability and energy efficiency. We changed the left blood chamber volume of 60 ml to 40 ml and the right blood chamber volume of 53 ml to 35 ml compared with previous types. Designs of inlet and outlet ports were modified to prevent backflow. In the mock circulatory system, redesigning the blood chambers resulted in a 20% increase in energy efficiency, about a two-fold increase of cardiac output and improved durability compared to the previous type. In an animal experiment, the ERTAH operated at a driving rate of 160 rpm with a left flow rate of 6.0 L/min and a right flow rate of 5.4 L/min. Interatrial shunt flow rate was 250-400 ml/min.
Wada
H
H
First Department of Surgery, Hiroshima University School of Medicine, Hiroshima International University, Hiroshima, Japan. hwada@mcai.med.hiroshima-u.ac.jp
Fukunaga
S
S
Watari
M
M
Imai
K
K
Sakai
H
H
Shibamura
H
H
Sueda
T
T
Matsuura
Y
Y
D000818:Animals; D004867:Equipment Design; D006041:Goats; D006325:Heart Atria; D006354:Heart, Artificial; D006439:Hemodynamics