Biodegradable polymer, preparation method and application thereof, and medical filling material

The invention relates to a biodegradable polymer, a preparation method and application thereof and a medical filling material. The biodegradable polymer has a main chain and a plurality of side chains, the main chain of the biodegradable polymer comprises polysaccharide macromolecules, the side chains of the biodegradable polymer comprise a polyethylene glycol-degradable polyester block copolymer and/or degradable polyester, and the main chain and the side chains are connected at least through covalent bonds. The covalent bond comprises any one or more of an ester bond, an amido bond, an imine bond, a carbon-sulfur single bond, a dihydropyridazine bond and a triazole bond. The biodegradable polymer can be in a flowing dispersion state in an aqueous solution, is injected in a liquid form, and is not easy to diffuse and shift after being injected. 本发明涉及一种生物可降解聚合物及其制备方法、应用和医用填充材料。上述生物可降解聚合物具有主链和多个侧链，生物可降解聚合物的主链包括多糖高分子，生物可降解聚合物的侧链包括聚乙二醇-可降解聚酯嵌段共聚物和/或可降解聚酯，主链与侧链之间至少通过共价键连接，共价键包括酯键、酰胺键、亚胺键、碳硫单键、二氢哒嗪键及三唑键中的任一种或几种。上述