Experimental repair of tracheal defect using a bioabsorbable copolymer

Area of Science:

• Biomaterials Science
• Regenerative Medicine
• Surgical Innovation

Background:

• Investigated epithelialization and cartilage formation in artificial trachea using bioabsorbable copolymers.
• Focused on creating a functional tracheal substitute for defect repair.

Purpose of the Study:

• To evaluate the efficacy of different bioabsorbable copolymers in promoting tracheal tissue regeneration.
• To assess the potential of a copolymer-gelatin hydrogel composite, with and without growth factors, for tracheal defect repair.

Main Methods:

• Created anterior tracheal defects in 15 rabbits, implanting three types of bioabsorbable copolymers.
• Group A: caprolactone-lactide copolymer sponge sheet. Group B: copolymer-gelatin hydrogel. Group C: copolymer-gelatin hydrogel with basic fibroblast growth factor.
• Tracheas were reinforced with external stents and evaluated histologically up to 12 months postoperatively.

Main Results:

• Group A showed epithelialization but no cartilage formation.
• Group B demonstrated epithelialization and new cartilage formation by 6 months.
• Group C exhibited enhanced epithelialization, cartilage formation, and neovascularization by 3-12 months.

Conclusions:

• A bioabsorbable copolymer incorporating gelatin hydrogel significantly induces tracheal epithelialization and cartilage formation.
• The addition of basic fibroblast growth factor further enhances tissue regeneration, including neovascularization.
• This copolymer-gelatin hydrogel composite shows potential for clinical use in pediatric tracheal defect repair.