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Engineered Graphene Material Improves the Performance of Intraneural Peripheral Nerve Electrodes
Bruno Rodríguez-Meana1,2, Jaume Del Valle1,2,3, Damià Viana4
1Institute of Neurosciences, Department of Cell Biology, Physiology and Immunology, Universitat Autònoma de Barcelona, Bellaterra, 08193, Spain.
Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|June 12, 2024
Summary
Engineered graphene neural interfaces (EGNITE) show promise for advanced neuroprostheses. These devices offer efficient nerve stimulation with reduced current, demonstrating biocompatibility and potential for restoring function in patients with limb loss or nerve injuries.
Area of Science:
- Biomaterials Science
- Neuroengineering
- Regenerative Medicine
Background:
- Limb neuroprostheses aim to restore motor and sensory functions using neural interfaces.
- Current interfaces rely on metal microelectrodes, facing limitations in performance and biocompatibility.
- A novel graphene-based material, EGNITE, is proposed as an advanced alternative.
Purpose of the Study:
- To evaluate the biocompatibility and functionality of EGNITE neural interfaces.
- To compare EGNITE's performance against traditional metal microelectrodes.
- To assess the potential of graphene-derived materials for next-generation neuroprostheses.
Main Methods:
- In vitro cell viability assays were performed to assess biocompatibility.
- In vivo studies involved intraneural implantation of EGNITE in animal models.
- Functional assessments included nerve stimulation, muscle activation, and recording of nerve signals (CNAP and ENG).
Main Results:
- EGNITE demonstrated no adverse effects on cell viability in vitro.
- In vivo, EGNITE implants showed no significant functional decrease or harmful effects, with a foreign body reaction comparable to existing materials.
- EGNITE achieved selective muscle activation using approximately three times less current than standard microelectrodes.
- High-resolution recordings of compound nerve action potentials (CNAP) and electroneurography (ENG) were obtained, though functionality decreased over time.
Conclusions:
- Engineered graphene, specifically EGNITE, is a promising conductive material for neural electrodes.
- EGNITE offers improved efficiency in nerve stimulation for advanced neuroprostheses.
- Further research into graphene-based materials could lead to significant advancements in restoring function for amputees and nerve-injured patients.
