Fluid dynamics of venous valve closure |
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Authors: | Yuchen Qui R C Quijano S K Wang Prof Ned H C Hwang |
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Institution: | (1) Department of Biomedical Engineering, University of Miami, 33124 Coral Gables, FL, USA;(2) Baxter Edwards CVS Division, Irvine, CA;(3) Present address: Bioengineering Program, Pennsylvania State University, 233 Hollowell Building, 16802 University Park, PA, USA |
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Abstract: | In vitro experiment was performed on a stended bovine jugular vein valve (VV, 14 mm I.D.×2 cm long) and a stentless bovine jugular
vein valve conduit (10 mm I.D.×6 cm long) in a hydraulic flow loop with a downstream oscillatory pressure source to mimic
respiratory changes. Simultaneous measurements were made on the valve opening area, conduit and sinus diameter changes using
a specially designed laser optic system. Visualization of flow fields both proximal and distal to the venous valve, and the
valve opening area were simultaneously recorded by using two video cameras. Laser Doppler anemometer surveys were made at
three cross sections: the valve inlet, the valve exist, and 2 cm downstream of the venous valve to quantity flow reflux at
valve closure. The experiment confirmed that the VV is a pressure-operated rather than a flowdriven device and that little
or no reflux is needed to close the valve completely. The experiment further demonstrated that the VV sinus expands rapidly
against back pressure, a critical character to consider in venous prosthesis design. |
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Keywords: | Venous prosthesis Reflux flow at valve closure Opening area ClosedP-Q loop Laser Doppler anemometer |
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