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Bioprinting Cellularized Constructs Using a Tissue-specific Hydrogel Bioink
Published on: April 21, 2016
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A novel bioprinting method and system for forming hybrid tissue engineering constructs
Y Shanjani1, C C Pan, L Elomaa
1Department of Orthopedic Surgery, Stanford University, 300 Pasteur Drive, Stanford, CA 94305, USA.
Biofabrication
|December 20, 2015
Summary
A new hybrid 3D bioprinting technology (Hybprinter) effectively integrates rigid scaffolds and soft hydrogels for advanced tissue engineering constructs (TECs). This innovation enables the creation of functional, mechanically robust, and cell-viable hybrid materials for tissue regeneration applications.
Area of Science:
- Biomaterials Science
- Tissue Engineering
- Biotechnology
Background:
- Three dimensional (3D) bioprinting offers precise control over cell and biomaterial placement for tissue engineering constructs (TECs).
- Hybrid TECs combining rigid scaffolds and soft hydrogels show promise for tissue regeneration under mechanical stress.
- Current 3D bioprinting methods struggle to integrate diverse soft and rigid materials effectively.
Purpose of the Study:
- To introduce a novel 3D hybrid bioprinting technology (Hybprinter) capable of integrating soft and rigid components.
- To demonstrate the Hybprinter's ability to fabricate complex hybrid TECs with tailored properties.
- To evaluate the mechanical properties, cell viability, and functionality of the developed hybrid constructs.
Main Methods:
- Hybprinter utilizes digital light processing-based stereolithography (DLP-SLA) for soft hydrogels (PEGDA) and molten material extrusion for rigid scaffolds (PCL).
- The study characterized geometrical accuracy, swelling ratio, and mechanical properties of the hydrogel component.
- Complex hybrid construct designs were printed and their mechanical properties and functionality assessed.
Main Results:
- The Hybprinter successfully integrated soft PEGDA hydrogels and rigid PCL scaffolds.
- Hybrid constructs exhibited significantly enhanced compressive mechanical stiffness (∼6 MPa) compared to hydrogels alone (100 kPa).
- Cell viability within the bioprinted hybrid constructs was approximately 90%, and constructs demonstrated effective nutrient diffusion for vascularized tissue engineering.
Conclusions:
- The developed Hybprinter technology is potent for fabricating functional TECs composed of both rigid and soft biomaterials.
- This technology addresses the limitations of current bioprinting systems in integrating multifunctional components.
- The findings support the potential of Hybprinter for advancing tissue regeneration applications, particularly for vascularized tissues.
