Experimental Study Of Hydrodynamics In PTFE-grafts
Author(s)
I. Van Tricht, D. De Wachter, J. H.M. Tordoir & P. Verdonck
Abstract
Experimental study of hydrodynamics in
PTFE-grafts
1. Van ~richt', D. De ~ a c h t e r ' , J.H.M ~ o r d o i r ~ and P. ~erdonck'
I Hydraulics Laboratory, Institute Biomedical Technology, Ghent
University (RUG), Ghent, Belgium.
2~epartnzent of Surgery, Academic Hospital Maastricht (AHW,
Maastricht. The Netherlands.
Abstract
An experimental model has been built to investigate the hydrodynamics in vascular
access grafts for hemodialysis. Two types polytetrafluorethyleen (PTFE)-grafts are
tested: a straight and a tapered graft. For both grafts, two scenarios are studied.
The first is the "normal" scenario: mean inlet pressure is kept at 100 mm Hg. In
the second, "low resistance", mean outlet pressure is held at 20 mm Hg. Flow rate
varies between 500 and 1500 mllmin. Temporal pressure curves and maximum
velocity curves are measured on different locations in the model. Spatial pressure
profiles for mean and pulse pressure are derived out of these measurements. Pulse
pressure is higher in the tapere
Keywords
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