Article having biocompatible surface

摘要

A compound of formula: I in which X1 is a reactive group that can react to form a covalent bond with a reactive group on the surface of a material to be rendered biocompatible, X2 is a group -O(-) or a precursor of such a group, n is 2, 3 or 4, Y is a group -N(+)R3A(-) wherein each R, which may be the same or different, is a C1-C4 alkyl group and A(-) is an anion present when X2 is an electrically neutral group or Y is wherein R1 together with X2 forms a direct bond between the nitrogen and the phosphorus atoms.