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Emerging 4D Fabrication of Tubular Structures and Clinical Challenges: Critical Perspective
1Department of Applied Mechanics and Biomedical Engineering, Indian Institute of Technology-Madras, Chennai 600036 Tamil Nadu, India.
ACS Materials Au
|November 17, 2025
Summary
4D fabrication uses smart materials to create dynamic tubular structures for medical applications. These advanced materials enable self-morphing, repair, and adaptation, overcoming limitations of traditional 3D printing for better patient outcomes.
Area of Science:
- Biomaterials Science
- Regenerative Medicine
- Additive Manufacturing
Background:
- Traditional 3D printing struggles with dynamic tubular structures needed for vascular grafts and nerve conduits.
- Limitations include poor vascular integration and challenges with endothelialization in small-diameter grafts.
Purpose of the Study:
- To explore the integration of stimuli-responsive smart materials in 4D fabrication for dynamic tubular medical structures.
- To highlight advancements in vascular grafts, stents, and nerve conduits using 4D bioprinting.
Main Methods:
- Utilizing stimuli-responsive smart materials to imbue printed structures with adaptive capabilities.
- Employing multimaterial printing for enhanced endothelial compatibility and structural integrity.
- Investigating self-assembling and self-folding mechanisms for complex anatomical applications.
Main Results:
- Demonstrated breakthroughs in fabricating vascular grafts with improved endothelial compatibility.
- Showcased advancements in bifurcated stents and multichannel nerve conduits addressing biomechanical complexities.
- Identified key challenges including material scalability, stimulus control, and mechanical stability.
Conclusions:
- 4D bioprinting offers significant potential for creating biomimetic tubular structures in regenerative medicine.
- Further research is needed to refine multifunctional biomaterials and develop advanced scaffolds for clinical translation.
- Overcoming current limitations is crucial for bridging the gap between 4D fabrication innovation and clinical application.
