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Spatially Programmable Electroadhesive Enables In Situ Site-Selective Functional Coupling.

Yuting Guo1,2,3, Zhuoming Liang1,2,3, Guoshi Xu4,5,6

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Researchers developed a light-activated bioadhesive (STICH) for precise, site-selective integration of bioelectronic devices with wet tissues. This technology enables robust, high-resolution tissue bonding for advanced bioelectronic therapies.

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bioadhesive interfacesmechanical and electrical couplingspatially programmable

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Area of Science:

  • Biomedical Engineering
  • Materials Science
  • Tissue Engineering

Background:

  • Integrating bioelectronic devices with wet biological tissues presents challenges in achieving precise spatial control of adhesion.
  • Existing methods often lack the resolution and robustness required for complex surgical applications.

Purpose of the Study:

  • To develop an in situ, spatially programmable electrical bioadhesive for site-selective bonding with wet biological tissues.
  • To enable functional coupling of bioelectronic devices with high spatial resolution and mechanical stability.

Main Methods:

  • A hydrogel matrix (chitosan/silver nanowire) incorporating Rose Bengal was used.
  • Light-activated bonding was achieved via patterned green light irradiation, generating singlet oxygen to oxidize tissue surfaces.
  • Covalent bonding formed between oxidized tissue and chitosan amine groups.

Main Results:

  • Achieved robust tissue bonding with a lap-shear strength of 160 kPa.
  • Demonstrated precise adhesion regions with approximately 2 µm resolution.
  • Enabled spatially resolved mechanical and electrical coupling for electromechanical sensing and neuromuscular stimulation.

Conclusions:

  • The STICH platform offers advanced microscale device-tissue integration capabilities.
  • This technology paves the way for reconfigurable bioelectronic therapies with enhanced precision.
  • Spatially programmable bioadhesion is crucial for next-generation implantable and wearable electronics.