Bioprinting of Stable Bionic Interfaces Using Piezoresistive Hydrogel Organoelectronics

Area of Science:

• Biomaterials Science
• Tissue Engineering
• Bioelectronics

Background:

• Integrating artificial electronics with biological tissues is crucial for bionic applications.
• A key challenge lies in developing artificial electronics that mechanically match biological tissues for effective strain transfer and deformation sensing.

Purpose of the Study:

• To create a highly tissue-integrative, soft mechanical sensor.
• To assess its mechanical properties, biocompatibility, bioadhesion, and suitability for 3D bioprinting.
• To fabricate and evaluate a 3D bionic construct using the developed sensor.

Main Methods:

• Fabrication of a composite piezoresistive hydrogel.
• Characterization of mechanical properties (e.g., elongation at fracture).
• Assessment of biocompatibility with multiple cell types.
• Evaluation of bioadhesive properties.
• 3D bioprinting of a multimaterial sensorized construct.
• Comparison with hydrogel casting methods for cell viability and interface integrity.

Main Results:

• The composite hydrogel exhibited exceptional mechanical properties, with up to 680% elongation at fracture.
• It demonstrated excellent biocompatibility and bioadhesive qualities, promoting stable cell adhesion.
• Bioprinted constructs showed significantly higher cell viability (87%) compared to cast constructs.
• The bioprinted interface maintained structural integrity and cell differentiation ability over 10 days.

Conclusions:

• The developed composite hydrogel is a promising material for soft mechanical sensors.
• Its tissue-integrative, bioadhesive, and 3D bioprinting capabilities facilitate stable sensor-tissue interfaces.
• This technology holds potential for implantable electronics and organ-on-a-chip systems.