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In-Foam Bioprinting: An Embedded Bioprinting Technique with Self-Removable Support Bath
Elias Madadian1,2, Hossein Ravanbakhsh1,2,3, Francesco Touani Kameni2,4
1Department of Mechanical Engineering École de technologie supérieure Montreal H3C 1K3 Canada.
Small Science
|April 11, 2025
Summary
A novel in-foam bioprinting technique uses albumin foam as a support bath, improving oxygen and nutrient delivery for 3D bioprinting. This method ensures high cell viability for complex tissue engineering applications.
Area of Science:
- Biomaterials Engineering
- Tissue Engineering
- Bioprinting Technology
Background:
- Traditional embedded 3D bioprinting faces challenges with low-viscosity hydrogels, including poor oxygenation, nutrient supply, and difficult support bath removal.
- Gel-based support baths limit cell viability and complicate the fabrication of complex, free-form tissue constructs.
Purpose of the Study:
- To develop and validate a novel in-foam bioprinting technique using an albumin foam support bath as a superior alternative to gel-based systems.
- To assess the printability, structural integrity, and cell viability offered by the in-foam bioprinting method for advanced biofabrication.
Main Methods:
- Characterization of the albumin foam support bath through foam stability and rheological testing.
- Measurement of bubble size dynamics within the foam to understand structural changes over time.
- 3D printing of free-form structures using thermoresponsive chitosan-based bioinks and evaluation of fibroblast L929 cell viability over seven days.
Main Results:
- The in-foam bioprinting technique demonstrated excellent printability and ease of support bath removal.
- Albumin foam provided cells with enhanced access to oxygen and nutrients, crucial for cell survival.
- Bioprinted fibroblast L929 cells exhibited high viability (>97%) over a seven-day culture period.
- The technique proved effective for fabricating large-scale samples with extended printing times without compromising cell viability.
Conclusions:
- In-foam bioprinting offers a promising advancement in biofabrication, overcoming limitations of traditional methods.
- The albumin foam support bath significantly enhances cell viability by improving nutrient and oxygen diffusion.
- This technique is highly suitable for the long-term culture and biofabrication of large, complex 3D constructs for tissue engineering.
