Polysulfone, polyacrylonitrile, and polymethylmethacrylate membranesare more biocompatible and more porous (high flux membranes).They are most often formed into hollow fibers. Blood travels downthe center of these fibers, and dialysate circulates around the outsideof the fibers but inside a plastic casing. Water for dialysis must meetcritical chemical and bacteriologic standards. These are listed inFigures 1-6 and 1-7.
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