Patient-specific tissue engineered vascular graft for aortic arch reconstruction

Area of Science:

• Biomaterials Science
• Regenerative Medicine
• Cardiovascular Surgery

Background:

• Aortic arch reconstruction is complex due to anatomical variations.
• Current methods face challenges in achieving patient-specific fit and long-term function.
• Tissue-engineered vascular grafts (TEVGs) offer a potential solution for complex cardiovascular repairs.

Purpose of the Study:

• To develop and evaluate patient-specific, 3D printed TEVGs for aortic arch reconstruction.
• To assess the anatomical fit, hemodynamic performance, and tissue integration of these grafts.
• To provide a proof of concept for TEVGs in complex aortic arch anomalies.

Main Methods:

• Cardiac MRI with 4D flow was used to obtain patient-specific anatomy.
• Computer-aided design and computational fluid dynamics optimized graft shape.
• 3D printing manufactured polycaprolactone/poly-L-lactide-co-ε-caprolactone grafts.
• Grafts were implanted in porcine aortic arch models, followed by imaging and histological analysis.

Main Results:

• 3D printed TEVGs demonstrated excellent anatomical fit without dilatation or stenosis over 3 months.
• Hemodynamic parameters, including peak wall shear stress, remained stable.
• Histology confirmed successful endothelization and smooth muscle layer formation without calcification.

Conclusions:

• Patient-specific 3D printed TEVGs achieve optimal anatomical fit and maintain hemodynamics.
• These grafts support neotissue formation and accommodate growth in vivo.
• This study validates the potential of patient-specific TEVGs for challenging aortic arch reconstructions.