Engineering 3D-printed standalone conductive nerve guides using soft bioinks for peripheral nerve injuries.

Area of Science:

• Biomaterials Science
• Regenerative Medicine
• Polymer Chemistry

Background:

• Conductive nerve guides (CNGs) show promise for nerve regeneration but conventional methods yield non-biodegradable and inflexible guides.
• Existing fabrication techniques limit customization and can involve cytotoxic residues.

Purpose of the Study:

• To develop customizable, 3D-printed conductive nerve guides using biocompatible materials.
• To overcome limitations of traditional nerve guides, focusing on biodegradability and ease of manufacturing.

Main Methods:

• Fabrication of bioinks using poly(3,4-ethylenedioxythiophene):polystyrene sulfonate (PEDOT:PSS) and polyvinyl alcohol (PVA).
• Extrusion-based 3D printing of standalone nerve guides without sacrificial supports.
• Tailoring polymer concentration and polymerization for desired bioink properties (conductivity, wettability, shear-thinning).

Main Results:

• Synthesized PEDOT:PSS/20% PVA bioinks exhibited enhanced conductivity, wettability, and shear-thinning behavior.
• 3D-printed conductive nerve guides were successfully customized to match defect dimensions in rodent models.
• The fabricated guides demonstrated excellent biodegradability and biocompatibility, with no need for post-processing removal of sacrificial materials.

Conclusions:

• Optimized bioink properties enable simple manufacturing of 3D-printed, biodegradable, and biocompatible CNGs with tunable dimensions.
• This approach addresses the need for tailored solutions for peripheral nerve injuries of varying sizes.
• 3D printing offers a versatile platform for creating advanced nerve regeneration scaffolds.