Advanced 3D/4D Bioprinting of Flexible Conductive Materials for Regenerative Medicine: From Bioinspired Design to Intelligent Regeneration

This review explores the integration of bioinspired conductive materials with advanced 3D/4D bioprinting technologies for regenerative medicine, focusing on neural, cardiac, and musculoskeletal tissue engineering. It introduces a framework to enhance tissue regeneration by mimicking native electrophysiological environments and highlights the potential of multi-material 4D bioprinting to create dynamic, smart scaffolds. These scaffolds adapt to physiological cues, promoting processes like axon regeneration and cardiomyocyte synchronization. The review emphasizes the need for AI-driven design and organ-on-a-chip validation to address challenges in vascularization, biosafety, and clinical scalability. Conductive polymers and materials like PEDOT:PSS, polyaniline, and carbon nanotubes are highlighted for their role in creating conductive scaffolds that enhance cell growth and differentiation through electrical stimulation. The document underscores the potential of these materials in tissue engineering, particularly for neural and cardiac applications, while addressing challenges like long-term toxicity and mechanical stability.