Freeform Perfusable Microfluidics Embedded in Hydrogel Matrices.

Area of Science:

• Biomaterials Engineering
• Microfluidics
• 3D Printing

Background:

• Hydrogel-based microfluidic devices are crucial for various applications, including tissue engineering.
• Existing fabrication methods can be complex and time-consuming.
• The freeform reversible embedding of suspended hydrogels (FRESH) 3D printing offers potential for intricate hydrogel structures.

Purpose of the Study:

• To adapt the FRESH 3D printing technique for fabricating perfusable microfluidics within a hydrogel matrix.
• To develop a simple and rapid prototyping method for biopolymer-based microfluidic devices.
• To explore the potential of this technique for constructing vascular grafts.

Main Methods:

• Modification of the FRESH 3D printing technique.
• Deposition of xanthan gum into a calcium chloride (CaCl₂) infused gelatin slurry to form filaments.
• Rinsing of the deposited filaments to create hollow channels within the hydrogel matrix.

Main Results:

• Successful fabrication of freeform perfusable microfluidics inside a hydrogel matrix.
• Demonstration of a simple and rapid prototyping approach using biopolymers.
• Generation of hollow channels through a rinsing process.

Conclusions:

• The modified FRESH 3D printing method enables the creation of intricate, perfusable microfluidic channels within hydrogels.
• This technique provides a facile route for rapid prototyping of microfluidic devices.
• The approach holds promise for applications in tissue engineering, particularly for vascular graft construction.