Cellulose Acetate is a specific type of polymer used for low protein binding applications.
Regenerated cellulose, on the other hand, is a pure cellulose which has been treated in a chemical bath for better chemical resistance.
It has a lower molecular weight and the structure is not as orderly as it is for a cellulose. An example of regenerated cellulose is
"cellophane" used in a dialysis application for artificial kidneys.