This invention relates to the field of biomedical materials technology, specifically to a
decellularized matrix microparticle (dECM-MPs) 3D
printing ink and its preparation method. The key technical points are: a heat-absorbing compound is temporarily dissolved on the surface of
decellularized matrix microparticles (dECM-MPs) via recrystallization from a supersaturated solution; then, the microparticles are immersed in a temperature-sensitive
gelatin solution. The heat absorbed during the
dissolution of the heat-absorbing compound leads to a localized low temperature around the microspheres, causing the
gelatin to solidify on the dECM-MPs surface, forming a physically cured
gelatin hydrogel microlayer in situ. This microlayer is further stabilized by enzymatic cross-linking. Photosensitive modified
hyaluronic acid molecules are introduced into the hydrogel microlayer to regulate its mechanical properties.
Centrifugation yields a particulate ink suitable for
extrusion 3D printing. After 3D printing,
ultraviolet light irradiation is used to produce a 3D printed
implant. This invention overcomes the problem that rigid dECM-MPs, such as decellularized
cartilage microparticles or decellularized bone microparticles, cannot be extruded and printed. By regulating the mechanical properties of the hydrogel microlayer, particulate ink with excellent printing performance can be obtained. This method overcomes the limitation of rigid tissues being difficult to additively manufacture.