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High-Speed Embedded Ink Writing of Anatomic-Size Organ Constructs.

Weijian Hua1, Cheng Zhang1,2, Haoran Cui1

  • 1Mechanical Engineering Department, University of Nevada Reno, Reno, Nevada, 89557, USA.

Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
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Summary
This summary is machine-generated.

This study introduces a novel particle-hydrogel system for high-speed embedded ink writing (EIW), enabling 3D printing speeds up to 110 mm/s. This breakthrough significantly advances 3D bioprinting for complex organ structures.

Keywords:
embedded ink writinghigh‐speed printingorgan reconstructionparticle‐hydrogel interactionsyield‐stress fluids

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Area of Science:

  • Biomaterials Science
  • 3D Bioprinting
  • Rheology

Background:

  • Embedded ink writing (EIW) is a 3D printing technique for complex biomaterial structures.
  • Current EIW speeds are limited to ~10 mm/s due to suboptimal rheological properties of particulate-dominated yield-stress fluids.
  • This limitation hinders efficient fabrication of large-scale constructs, such as organs.

Purpose of the Study:

  • To develop an advanced particle-hydrogel interactive system for liquid baths.
  • To enhance yield stress and thixotropic response time for high-speed EIW.
  • To overcome the speed limitations of current EIW techniques.

Main Methods:

  • Designed a particle-hydrogel interactive system using particle additives and three representative polymeric hydrogels.
  • Established and validated interaction models for the resulting nanocomposites via rheological measurements and microstructure characterization.
  • Investigated filament formation mechanisms in the interactive baths at high printing speeds.

Main Results:

  • The particle-hydrogel system demonstrated enhanced yield stress and extended thixotropic response time.
  • Successfully printed an anatomic-size human kidney construct at a record speed of 110 mm/s in approximately 4 hours.
  • Achieved a printing speed increase of at least 10 times compared to current EIW methods.

Conclusions:

  • The developed particle-hydrogel interactive system significantly breaks the speed barrier in EIW.
  • This high-speed EIW method offers an efficient and promising solution for future organ reconstruction.
  • The findings pave the way for rapid fabrication of complex, large-scale 3D biological structures.