Remote Outcomes with Poly-ε-Caprolactone Aortic Grafts in Rats

Area of Science:

• Biomaterials Science
• Vascular Surgery
• Regenerative Medicine

Background:

• Poly-ε-caprolactone (PCL) is a biodegradable polymer utilized in bioengineering.
• Long-term PCL performance is influenced by application, structure, and environment.
• Vascular graft behavior requires extensive in vivo evaluation.

Purpose of the Study:

• To assess the 180-day outcomes of Poly-ε-caprolactone (PCL) tubular grafts for abdominal aorta replacement in a rat model.
• To investigate tissue reactions, graft patency, and degradation characteristics of PCL grafts.
• To identify potential advantages and disadvantages of PCL for vascular applications.

Main Methods:

• Implantation of PCL vascular matrices into adult Wistar rats.
• 180-day observation period with ultrasound diagnostics and X-ray tomography (CBCT).
• Histological analysis, immunohistochemical (IHC) staining for S100 proteins, and EDS mapping.

Main Results:

• PCL grafts maintained patency without thrombosis or leakage throughout the 180-day study.
• Endothelialization and neointimal hyperplasia were observed in all grafts.
• Subintimal calcium phosphate deposits and foreign body reactions were noted, correlating with mineralization and chondroid metaplasia.

Conclusions:

• PCL vascular scaffolds demonstrate advantages in permeability, revitalization, and surgical outcomes.
• Key disadvantages include slow biodegradation rates and significant risks of mineralization and intimal hyperplasia.
• Further research is needed to mitigate PCL's drawbacks for long-term vascular applications.