Abstract: A medical device, particularly a filter, cannula, catheter, or implant made of plastic or plastic-coated metal or glass for fixing disease-causing microorganisms, particularly viruses, bacteria, and fungi as well as pathogenic metabolic products, toxins, lipoid substances, and drugs, wherein the plastic surface is provided (firmly attached thereto or covalently bound therewith):a) homologous or monoclonal immunoglobulins, preferably those that have been afterpurified by affinity chromatography in the classes G1, G2, G3, and/or G4 and/or IGM, IGE, IGD and/or IGA and/or the F(ab)2 fragments thereof, preferably those that have been afterpurified by affinity chromatography, which are selectively active against the specific antigens or antigenic determinants of the respective disease-causing microorganisms, particularly viruses, bacteria, and fungi as well as pathogenic metabolic products, toxins, lipoid substances (e.g.