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Abstracts: ASAIO Cardiac Abstracts

LINEAR BLOODPUMP - A NEW CONCEPT FOR FLUID PROPAGATION IN CARDIAC ASSIST DEVICES OR TOTAL ARTIFICIAL HEART

Schoendube, Friedrich A1; Juettner, Wolfgang2; Landrath, Joachim3; Grossmann, Marius1

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Long-term cardiac support and total artificial heart with displacement or rotary blood pumps is still crucial due to blood cell damage, hemolysis, thrombus formation or bleeding. We propose a new concept that is not in need of membranes for displacement or impellers for rotating motion of the fluid, but aims to mimic the displacement of an inlet valve against an outlet valve in the natural cardiac cycle. At the end of a tube (diameter 3 cm, length 10 cm) an outlet valve is fixed and a second valve moves within the tube against this valve, driven by a magnetic linear motor (see figure). With this design the mean energy loss is calculated to approximately 2.4 W at a flow rate of 4.8 l/min against a load of 120 mm/Hg. As the gap between inner wall of the tube with carbon surface and the moving piston can be reduced to at least 5 μm a laminar flow of low viscosity results. The blood pump can be designed for high frequencies and low displacement volumes making cardiac assist for new-borns and infants feasible.

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Copyright © 2005 by the American Society for Artificial Internal Organs