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Melt Electrowriting High Resolution Poly(ethylene-co-vinyl acetate) Scaffolds for Soft Tissue Engineering.

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Area of Science:

  • Biomaterials Science
  • Regenerative Engineering
  • Polymer Science

Background:

  • Melt electrowriting (MEW) is promising for regenerative engineering.
  • Clinical translation of MEW is limited by poor replication of soft tissue biomechanics.
  • A need exists for compliant, biocompatible polymers for high-resolution scaffold fabrication.

Purpose of the Study:

  • To introduce polyethylene vinyl acetate (PEVA) for MEW scaffold fabrication.
  • To characterize the mechanical properties and biocompatibility of MEW PEVA scaffolds.
  • To assess the potential of MEW PEVA for soft tissue engineering.

Main Methods:

  • Optimized MEW parameters for PEVA to achieve a stable jet and microscale fibers.
  • Fabricated scaffolds with pore sizes down to 100 µm.
  • Evaluated mechanical properties (tensile and compressive loading) and cell viability/metabolic activity.

Main Results:

  • Achieved the highest diameter-to-spacing ratio for elastic MEW polymers.
  • MEW PEVA fibers showed significantly enhanced compliance compared to TPU and PCL under tensile loading.
  • PEVA scaffolds exhibited superior compressive compliance and high yield strains, supporting robust cell attachment, survival, and metabolic activity.

Conclusions:

  • PEVA is a highly compliant and biocompatible material for high-resolution MEW scaffolds.
  • MEW PEVA overcomes the mechanical mismatch between scaffolds and native soft tissues.
  • This advancement expands the translational potential of MEW for soft tissue engineering.