Chitosan is a linear amino-polysaccharide of β(1→4)-linked D-glucosamine and N-acetyl-D-glucosamine residues. Also called poly-β-(1-4)-2-amino-2-deoxy-β-D-glucose, it is a natural heteropolymer obtained by alkaline deacetylation of the amino acetyl groups of chitin, which is the main component of the exoskeleton of insects, crabs, shrimp, and krill. The design and fabrication of chitosan-based hydrogels is based on the association with glycerophosphate salt. The mixture remains liquid at room temperature, and it gels quickly when heated to body temperature.

This work, in the form of patent analysis, presents the state by introducing what has been innovated and patented concerning chitosan-based hydrogels. Furthermore, a detailed analysis of the patentability, by using the “chemical compounds search” of the PATENTSCOPE database, has been provided regarding publication years, inventors, applicants, owners, jurisdictions, and classifications.