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Multiple-Step Injection Molding for Fibrin-Based Tissue-Engineered Heart Valves.

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This study introduces a novel injection molding technique for creating complex, heterogeneous tissue-engineered heart valves (TEHVs). The method allows for diverse cell and material placement, improving TEHV design for better function.

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Area of Science:

  • Biomaterials Science
  • Cardiovascular Engineering
  • Regenerative Medicine

Background:

  • Heart valves are complex, anisotropic structures crucial for circulatory function.
  • Current tissue-engineered heart valves (TEHVs) often lack the heterogeneity of native valves, using uniform cell and material compositions.
  • Mimicking native valve complexity is essential for improved TEHV performance.

Purpose of the Study:

  • To develop an accessible and adaptable method for creating spatially diverse heart valve fibrin scaffolds.
  • To fabricate TEHVs with distinct cellular and material compositions in the wall and leaflets.
  • To establish a versatile platform for advanced TEHV construction.

Main Methods:

  • A multi-step injection molding process was employed to fabricate heterogeneous TEHVs.
  • The technique allowed for the integration of different cell types and materials into specific valve regions (wall and leaflets).
  • Valves were tested for integrity and functionality using bioreactor cycles and 2-week cell stimulation.

Main Results:

  • The injection molding method successfully produced TEHVs with heterogeneous wall and leaflet compositions without sutures or adhesives.
  • Functional integrity was confirmed through mechanical testing and histological analysis post-stimulation, showing proper tissue formation and cell localization.
  • Proof-of-concept fabrication demonstrated the use of different materials for wall and leaflets, including layered leaflet structures.

Conclusions:

  • The developed method provides an easy, reproducible, and versatile approach to engineer heterogeneous TEHVs.
  • This technique overcomes limitations of homogenous TEHV designs by enabling spatial control over cell and material distribution.
  • The method is readily transferable to other hydrogel systems, offering broad applicability in tissue engineering.