Effects of Braiding Parameters on Tissue Engineered Vascular Graft Development

Area of Science:

• Biomaterials Science
• Regenerative Medicine
• Vascular Surgery

Background:

• Tissue engineered vascular grafts (TEVGs) offer a promising alternative to traditional grafts.
• In vivo tissue engineering relies on the body's natural healing processes to form neotissue within a scaffold.
• Poly(glycolic acid) (PGA) and poly(glycerol sebacate) (PGS) are biocompatible materials suitable for scaffold fabrication.

Purpose of the Study:

• To investigate the impact of scaffold braid design and coating on neotissue formation in TEVGs.
• To identify critical relationships between scaffold parameters and graft performance.
• To optimize TEVG fabrication for improved cellular and extracellular composition.

Main Methods:

• Fabrication of braided poly(glycolic acid) (PGA) scaffolds coated with poly(glycerol sebacate) (PGS).
• Evaluation of scaffold variations in a Beige mouse infrarenal abdominal aorta model.
• In vivo monitoring using 4D ultrasound and ex vivo analysis of mechanical properties and histology.

Main Results:

• Scaffold parameters, including braiding angle, density, and PGS coating, have interdependent effects on graft performance.
• Alterations in scaffold design influenced inflammation, extracellular matrix production, graft dilation, and neovessel distensibility.
• Regression analysis revealed critical relationships between scaffold design and neotissue composition.

Conclusions:

• Scaffold design parameters critically influence in vivo neotissue formation and TEVG performance.
• Tailoring scaffold features can induce favorable cellular and extracellular matrix composition.
• This approach holds potential for fabricating optimized TEVGs with a broad range of features.