Advances in 3D and 4D Bioprinting for Functional Tissue Regeneration
Translating multi-material shear-thinning bioinks into vascularized tissue scaffolds: mechanisms, recent breakthroughs, and clinical translation hurdles.
Three-dimensional (3D) and four-dimensional (4D) bioprinting represent transformative paradigms in tissue engineering and regenerative medicine. The ability to deposit patient-specific cells encapsulated within biocompatible hydrogels layer-by-layer enables the fabrication of complex biomimetic tissue architectures with unprecedented spatial precision.
Bioink Rheology and High Cell Viability
A central challenge in extrusion-based bioprinting is balancing printability with cellular viability. Formulations must exhibit pronounced shear-thinning behavior under extrusion stress while rapidly regaining structural integrity post-deposition to avoid construct collapse before crosslinking.
“Tissue engineering success lies not merely in printing cellular geometry, but in orchestrating microvascular networks that guarantee sustained metabolic transport.”