3D puzzle-inspired construction of large and complex organ structures for tissue engineering

Area of Science:

• Biotechnology
• Tissue Engineering
• 3D Printing

Background:

• Conventional 3D bioprinting faces challenges in fabricating large, multi-material organ structures due to printer limitations and material instability.
• Current methods often restrict the use of single bio-inks, hindering the creation of complex tissues mimicking natural organs.

Purpose of the Study:

• To introduce a novel "building block-based printing" strategy inspired by 3D puzzles for fabricating large and complex 3D tissue constructs.
• To overcome the limitations of conventional 3D bioprinting in terms of size, material diversity, and geometric complexity.

Main Methods:

• Developed a "building block-based printing" strategy assembling pre-printed small bio-blocks into larger, complex structures.
• Demonstrated the fabrication of intricate structures including multi-material puzzles, hollow collagen constructs, and a full-size human heart model.

Main Results:

• Successfully prepared large-scale, complex 3D tissue constructs previously difficult to achieve with standard 3D printing.
• Fabricated multi-material, multi-color puzzle-like structures and a hollow, closed collagen 'soccer' ball.
• Created a full-size human heart model, showcasing the scalability and versatility of the method.

Conclusions:

• The 3D puzzle-inspired strategy enables the creation of large, complex, multi-material organ structures for tissue engineering.
• This approach facilitates controlled spatial arrangement of diverse cell types, enabling studies on cell-cell interactions.
• Opens new avenues for advanced tissue engineering and regenerative medicine applications.