Triple-layered polyurethane prosthesis with wrinkles for repairing partial tracheal defects

Area of Science:

• Biomaterials Science
• Regenerative Medicine
• Tissue Engineering

Background:

• Tracheal defects pose significant clinical challenges.
• Current reconstruction methods have limitations.
• Artificial scaffolds offer a promising alternative for tracheal repair.

Purpose of the Study:

• To develop a triple-layered artificial polyurethane (PU) scaffold with a wrinkled layer.
• To evaluate the efficacy of this scaffold for reconstructing partial tracheal defects.

Main Methods:

• Fabrication of a triple-layered PU scaffold using immersion precipitation and casting techniques.
• In vivo transplantation of scaffolds into rabbit tracheal windows.
• Assessment via endoscopic, histological, and mechanical analyses.

Main Results:

• The wrinkled PU scaffold exhibited enhanced flexural strength compared to non-wrinkled controls.
• Endoscopic and histological evaluations showed complete coverage with respiratory mucosa by 6 weeks.
• Tracheal lumen integrity was maintained in 70% of the rabbits.

Conclusions:

• A wrinkled, triple-layered PU scaffold is a viable, ready-made solution for partial tracheal defect reconstruction.
• The scaffold supports regeneration of functional respiratory tissue.