Patent ID: 6967003

Claim:
A membrane artificial lung for performing gas exchange between blood and a gas via the membrane by flowing blood on a first surface of the membrane and flowing oxygen or an oxygen-containing gas on a second opposing surface of the membrane, said membrane comprising: a hollow fiber membrane comprising poly-4-methylpentene-1, and having an oxygen permeation rate Q(O 2 ) at 25° C. of from 5×10 −4 to 2×10 −3 (cm 3 (STP)/cm 2 .sec.cmHg) and an ethanol flux of from 0.1 to 100 ml/min.m 2 ; and an ionic complex provided on said first surface of said membrane, said ionic complex comprising: a first quaternary aliphatic alkylammonium salt having from 22 to 26 carbon atoms in total; a second quaternary aliphatic alkylammonium salt having from 37 to 40 carbon atoms in total; and heparin or a heparin derivative.