Guided tissue regeneration membrane and preparation method thereof

The invention discloses a preparation method of a guided tissue regeneration membrane, wherein the method comprises the following steps: (1) selecting at least two samples, wherein at least one of thesamples is an inorganic polymer composite material; forming by a forming technology, obtaining a primary product stacked with at least two layers, and then placing the primary product in a high pressure vessel; (2) replacing gas in the high pressure vessel with supercritical fluid; (3) pressurizing the high pressure vessel, and making the primary product saturated in a high-temperature and high-pressure supercritical fluid atmosphere; and (4) rapidly relieving the pressure, and thus obtaining the guided tissue regeneration membrane. A supercritical fluid is used as a physical foaming agent, amembrane material with a multi-layer distributed pore structure is controllably prepared by adjusting a layered distribution structure of inorganic fillers in medical biodegradable polymers, and themedical biodegradable polym