Pneumatic conveying printing technique for bioprinting applications

Area of Science:

• Biotechnology
• Biofabrication
• Cell Engineering

Background:

• Droplet-based bio-printing (DBB) is widely used but faces limitations like restricted bio-ink choices and cell damage from high pressure/shear rates in inkjet printing.
• Existing methods struggle with high-viscosity bio-inks and maintaining cell integrity during the printing process.

Purpose of the Study:

• To introduce and validate a novel pneumatic conveying printing (PCP) technique for cell bio-printing.
• To overcome the limitations of traditional inkjet-based bio-printing, particularly regarding cell viability and material versatility.

Main Methods:

• Developed a pneumatic conveying printing (PCP) system for precise droplet deposition of bio-inks.
• Encapsulated cells within a calcium alginate hydrogel matrix for printing.
• Utilized sodium alginate bio-ink deposited onto a CaCl2-treated surface for rapid gelation.

Main Results:

• The PCP technique demonstrated gentle cell handling, avoiding significant pressure exposure and preserving cell viability.
• Successfully printed bio-inks with viscosities exceeding 1000 mPa s, enabling high cell concentrations.
• Achieved printing resolutions of 400-600 μm with encapsulated cells demonstrating survival and proliferation.

Conclusions:

• Pneumatic conveying printing (PCP) is a highly effective and gentle droplet-based bio-printing technique.
• PCP expands the range of usable bio-inks and cell densities, enhancing cell viability.
• This novel method is suitable for both 2D and 3D cell bio-printing applications.