Microporous biodegradable polyurethane membranes for tissue engineering.

Area of Science:

• Biomaterials Science
• Polymer Chemistry
• Membrane Technology

Background:

• Biodegradable polymers are crucial for tissue engineering and regenerative medicine.
• Developing functional membranes with controlled porosity is essential for biomedical applications.

Purpose of the Study:

• To develop microporous membranes from biodegradable polyurethane with controlled pore size and structure.
• To optimize the phase-inversion technique for producing these membranes.
• To evaluate the potential of these membranes for skin wound cover and as an artificial periosteum.

Main Methods:

• Modified phase-inversion technique using biodegradable polyurethane.
• Investigated parameters: solvent type, solvent-nonsolvent ratio, polymer concentration, solidification time, and layer thickness.
• Evaluated polymer-N,N-dimethylformamide-water, polymer-N,N-dimethylacetamide-water, and polymer-dimethylsulfoxide-water systems.

Main Results:

• The polymer-N,N-dimethylformamide-water system yielded the best results.
• Optimal conditions: 5% (w/v) polymer concentration, 10% (v/v) nonsolvent, 23°C cast temperature, and 24-48h solidification time.
• Resulting membranes exhibited interconnected pores, defined structure, good water permeability, and satisfactory mechanical properties for suturing.

Conclusions:

• Optimized phase-inversion successfully produced microporous biodegradable polyurethane membranes.
• These membranes possess characteristics suitable for skin wound dressings.
• Potential application as an artificial periosteum in cartilage defect repair was demonstrated.