Scaffold-Free Bioprinter Utilizing Layer-By-Layer Printing of Cellular Spheroids

Area of Science:

• Biomedical Engineering
• Tissue Engineering
• Regenerative Medicine

Background:

• Scaffold-free engineered tissues offer clinical advantages over traditional methods by avoiding adverse responses associated with biomaterials.
• Existing scaffold-free methods, like the Kenzan method, can be time-inefficient due to single-spheroid manipulation.

Purpose of the Study:

• To design and construct a novel scaffold-free bioprinter capable of printing an entire layer of spheroids simultaneously.
• To enhance the efficiency and reduce the fabrication time for scaffold-free engineered tissues.

Main Methods:

• Computer-aided design was used to develop the bioprinter, which was constructed using machined, 3D printed, and commercial components.
• The bioprinter's efficiency and precision were evaluated using Zirconia and alginate beads, mimicking cellular spheroids.
• Human induced pluripotent stem cell-derived spheroids were used for a proof-of-concept demonstration.

Main Results:

• The novel bioprinter successfully printed an entire layer of beads/spheroids onto a 4x4 needle array in under a minute.
• High precision was demonstrated with an average overlap coefficient of 0.997 between printed layers.
• The bioprinter efficiently placed cellular spheroids, confirming its capability for layer-by-layer tissue printing.

Conclusions:

• The developed scaffold-free bioprinter is efficient and precise, significantly reducing tissue fabrication time.
• This technology offers a scalable solution for printing complex, large-scale scaffold-free engineered tissues.
• The layer-by-layer approach holds promise for advancing regenerative medicine and clinical tissue engineering applications.