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Optimizing Flexible Microelectrode Designs for Enhanced Efficacy in Electrical Stimulation Therapy.

Lihong Qi1, Zeru Tao2, Mujie Liu3

  • 1Ningbo Zhenhai People's Hospital Health Management Center, Ningbo 315202, China.

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The serpentine flexible microelectrode (FM) offers superior flexibility and safety for electrical stimulation therapy (EST) in wound healing. Its design minimizes thermal risks and shows potential for self-powering applications.

Keywords:
MEMSchronic wound healingelectrical stimulation therapyflexibleserpentine structure

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Area of Science:

  • Biomedical Engineering
  • Materials Science
  • Regenerative Medicine

Background:

  • Chronic wounds pose a significant health challenge, necessitating advanced therapeutic strategies.
  • Electrical Stimulation Therapy (EST) shows promise for accelerating wound healing.
  • Optimizing electrode design is crucial for effective and safe EST delivery.

Purpose of the Study:

  • To evaluate the impact of flexible microelectrode (FM) geometry on Electrical Stimulation Therapy (EST) for chronic wound healing.
  • To compare the performance, safety, and potential self-powering capabilities of different FM designs.
  • To investigate the influence of hydrogel properties on electrical stimulation distribution.

Main Methods:

  • Fabrication of three flexible microelectrode (FM) variants (hexagonal, cross-shaped, serpentine) with Ag-Cu coverings (ACCs) and polypyrrole/polydopamine/polyaniline (PPY/PDA/PANI) integration.
  • Comprehensive animal studies utilizing hydrogel dressings.
  • Electrical and mechanical modeling and simulations to assess performance and safety.

Main Results:

  • The serpentine-shaped FM demonstrated superior flexibility and safety, with minimal thermal effects and reduced burn risk compared to other designs.
  • Flexible microelectrodes (FMs) with <3% metal coverings showed potential for optoelectronic self-powering.
  • Hydrogel non-uniformity significantly affected electrical property distribution on the skin surface.

Conclusions:

  • The serpentine FM design is optimal for safe and effective EST in chronic wound healing.
  • Further research into self-powering capabilities of FMs is warranted.
  • Hydrogel characteristics must be considered for precise electrical stimulation delivery in EST protocols.