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Flow Pattern Analysis of the Baylor Total Artificial Heart
Author(s) -
MEIER DIRK,
WERNICKE JENSTH.,
ORIME YUKIHIKO,
TAKATANI SETSUO,
TASAI KIMITAKA,
DAMM GEORGE,
NAITO KOZO,
MIZUGUCHI KAZUMI,
MAKINOUCHI KENZO,
GLUECK JULIE,
SHIMONO TAKATSUGU,
MATSUDA YUKIHIRO,
OHARA YASUHISA,
KOJIMA RYUSUKE,
NOON GEORGE P.,
DEBAKEY MICHAEL E.,
NOSÉ YUKIHIKO
Publication year - 1994
Publication title -
artificial organs
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.684
H-Index - 76
eISSN - 1525-1594
pISSN - 0160-564X
DOI - 10.1111/j.1525-1594.1994.tb03345.x
Subject(s) - inflow , outflow , preload , ball valve , closing (real estate) , globe valve , flow (mathematics) , diaphragm (acoustics) , materials science , flow visualization , mechanics , volumetric flow rate , afterload , geology , mechanical engineering , ventricle , hemodynamics , physics , engineering , cardiology , acoustics , medicine , meteorology , political science , law , loudspeaker
Abstract: To obtain an optimal design of the left blood chamber of the total artificial heart (TAH), flow visualization studies were performed. Information on velocities in critical areas of the left chamber was gathered using sectional pulsed laser light. The flow patterns on the entire pumping duration were photographed frame by frame. The inflow port, the opposite of the inflow and outflow of the pump (bottom area), and the diaphragm/ housing junction were the focal areas. The pump conditions, such as chamber pressure, preload and afterload pressure, pumping rate and roller screw, and displacement were recorded. Major stagnations and a low washout effect were observed in the bottom region. The closing of the inflow valve was irregular. In order to solve this problem, the inflow valve angle was changed 20 degrees. A comparison study showed a better valve closing characteristic, and no stagnation areas were observed with this new valve angle. Various velocity profiles confirmed the results. The valve closing characteristic is described in relationship to back flow.