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Rapid Deep Vat Printing Using Photoclickable Collagen-Based Bioresins.

Michael Winkelbauer1, Amelia Hasenauer1, Dominic Rütsche1,2

  • 1Department of Health Sciences and Technology, ETH, Zürich, 8093, Switzerland.

Advanced Healthcare Materials
|July 4, 2025
PubMed
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This summary is machine-generated.

Researchers developed new collagen bioresins for deep vat printing (DVP), achieving high-resolution bioprinting of complex tissues. This innovation enables faster, more precise fabrication of biomimetic tissue constructs for engineering applications.

Area of Science:

  • Biomaterials Science
  • Tissue Engineering
  • Bioprinting Technologies

Background:

  • Deep vat printing (DVP) offers high-resolution, high-speed layer-free bioprinting.
  • Collagen is a key biomaterial in tissue engineering, but its use in DVP is limited.
  • Existing DVP methods face challenges with optical properties and material stability.

Purpose of the Study:

  • To develop photoclickable collagen-based resins compatible with DVP.
  • To enhance the stability and optical properties of collagen bioresins.
  • To demonstrate multi-material DVP for creating complex, biomimetic tissue constructs.

Main Methods:

  • Development of photoclickable collagen-based resins with iodixanol as a refractive index matching agent.
  • Utilization of tomographic and filamented light (Flight) DVP techniques.
Keywords:
FLight printingcollagenphotoclickthiol‐enetissue interfacetomographic printing

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  • Fabrication of multi-material constructs with muscle and connective tissue interfaces.

    • Main Results:

    • Achieved print resolution up to 50 µm and printing speeds under 20 s/cm³.
    • Demonstrated improved resin stability under neutral conditions and reduced optical inhomogeneities.
    • Created intricate tissue constructs with aligned myotubes, transition zones, and biomimetic sarcomere structure (≈2.6 µm).

    Conclusions:

    • Photoclickable, isotonic, and neutral collagen-based bioresins are suitable for DVP.
    • This advancement provides a novel solution for fabricating biomimetic complex tissues and grafts.
    • The developed resins and methods enable enhanced biomimicry and functionality in engineered tissues.