Four-Dimensional Printing of Shape Memory Polymers for Biomedical Applications: Advances in DLP and SLA...

Area of Science:

• Biomedical Engineering
• Materials Science
• Polymer Chemistry

Background:

• Shape memory polymers (SMPs) exhibit reversible shape-changing properties triggered by external stimuli.
• Advanced manufacturing, particularly 4D printing, enhances SMPs' potential in biomedical applications.

Purpose of the Study:

• To review recent advances in SMP chemistry, biomedical applications, manufacturing, and clinical translation.
• To highlight the role of vat photopolymerization techniques like stereolithography (SLA) and digital light processing (DLP).

Main Methods:

• Synthesis of current research on SMP resin design, including multi-responsive and nanocomposite formulations.
• Focus on AI-guided material discovery and biocompatible/biodegradable formulations.
• Analysis of challenges in clinical translation, such as cytotoxicity and regulatory compliance.

Main Results:

• 4D-printed SMPs enable spatiotemporally controlled architectures for diverse biomedical uses.
• Applications span minimally invasive implants, dynamic tissue scaffolds, and advanced drug delivery systems.
• Recent developments include novel resin designs and AI-driven material discovery.

Conclusions:

• Understanding the link between material design, processing, and performance is crucial for advancing 4D-printed SMPs.
• Addressing roadblocks like cytotoxicity and regulatory hurdles is essential for clinical implementation.
• Future directions point towards next-generation, patient-centered medical devices leveraging SMP technology.