The invention relates to a biocompatible polymer composition for an articlehaving asurface intended to contact blood, tissue, skin, epithelial layers, wounds,cells inculture fluids, body fluids, dialysis fluids and/or therapeutic fluids forremoval orinfusion, characterized in that the polymer composition comprises a polymerand abismuth complex incorporated into the polymer composition in an amountcorresponding to 0.002 to 0.08 weight % bismuth of the polymer composition, amethod for preparing such biocompatible polymer composition and an articlewhichhas at least one film of such polymer composition covering its surface.
