Patent ID: 8142717

Claim:
An oxygenator comprising a plurality of hollow fiber membranes positioned in a housing, wherein at least a part of the hollow fiber membranes to contact blood during use is coated with a (meth)acrylate copolymer formed by the copolymerization of a hydrophobic (meth)acrylate with a hydrophilic (meth)acrylate at a molar ratio of (50 to 90):(50 to 10), wherein the (meth)acrylate copolymer is water-insoluble to the extent that when 1% by weight of the (meth)acrylate copolymer is allowed to stand for 30 days in 99% by weight of a physiological saline solution of 37° C., the (meth)acrylate copolymer is not reduced in weight by more than 1%.