Systems and method are disclosed for forming a biocompatible cross-linked polymer having an interpenetrating polymer network (IPN) by cross-linking a heteropolysaccharide to form a single cross-linked material and performing one or more additional cross-linkings on the single cross-linked material to form a multiple cross-linked material, wherein the multiple cross-linked material has one or more IPN regions resisting biodegradation in a human body than the single cross-linked material and one or more single cross-linked extensions radiating out from the IPN, wherein the combination of the IPN and the extension provide biodegradation resistance, soft touch feeling, and ease of insertion into the human body.
