[Flow through an improved ball valve for the heart assist device].
Objective of the present study is the hemodynamic investigation of the fluidmechanics a ball valve developed for ventricular assist devices with improved parameters. The flow was investigated using Digital Particle Image Velocimetry with an enlarged model of the valve (2.8:1). The flow was recorded using a high speed video camera with 250 fps and analyzed by a cross-correlation method implemented in the software DaVis by LaVision. The results confirmed the improvement of the ball valve performed by a numerical study. The flow separations on the ball valve housing observed in the first design version was eliminated in the final design of the novel valve. Hence a valve of this design applied in ventricular assist devices can be expected to have a lower rate of thromboembolic complications.
Aguilera
D
D
Universitätsklinikum Charité, Labor für Biofluidmechanik, Humboldt Universität, Deutschland. deibris@hotmail.com
Affeld
K
K
Lederer
Ch
Ch
Goubergrits
L
L
D001696:Biomechanical Phenomena; D001783:Blood Flow Velocity / Q000502:physiology; D001809:Blood Viscosity / Q000502:physiology; D004867:Equipment Design; D006353:Heart-Assist Devices; D006439:Hemodynamics / Q000502:physiology*; D006801:Humans; D008955:Models, Cardiovascular