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Soft tissue reactions evoked by implanted gallium phosphide.

Cecilia E Linsmeier1, Lars Wallman, Linda Faxius

  • 1Neuronano Research Center, BMC F10, Lund University, SE-221 84 Lund, Sweden. cecilia.eriksson_linsmeier@med.lu.se

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Gallium phosphide (GaP) nanowire neural devices showed poorer biocompatibility than titanium. GaP implants resulted in thicker tissue capsules and increased gallium in organs, indicating material degradation and adverse tissue reactions.

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Area of Science:

  • Biomaterials Science
  • Neuroscience
  • Materials Engineering

Background:

  • Neural devices are crucial for diagnosing and treating neurological conditions like stroke and neurodegenerative disorders.
  • Optimized neural interfaces require biocompatibility for chronic implantation, enabling signal recording and stimulation.
  • Nanostructured surfaces, such as vertical gallium phosphide (GaP) nanowires, offer potential improvements in electrode performance and reduced tissue response.

Purpose of the Study:

  • To evaluate the soft tissue reactions and biocompatibility of gallium phosphide (GaP) nanostructured surfaces compared to titanium (Ti).
  • To assess the foreign-body response to GaP implants over time.
  • To measure gallium ion (Ga) concentration in systemic organs following implantation.

Main Methods:

  • GaP and Ti control materials were implanted into the rat abdominal wall for 1, 6, and 12 weeks.
  • Foreign-body response was quantified by measuring reactive capsule thickness and cellular infiltration (ED1-positive macrophages, total cells).
  • Gallium concentration in blood, brain, liver, and kidneys was measured using chemical analysis.

Main Results:

  • Significant differences in total and ED1-positive cell densities were observed between GaP and Ti implants at 12 weeks.
  • Elevated gallium concentrations were detected in the brain, liver, and kidneys over the 12-week implantation period.
  • These findings indicate gallium leaching from the GaP implants.

Conclusions:

  • Gallium phosphide (GaP) exhibits worse biocompatibility compared to the established biomaterial titanium (Ti).
  • The observed tissue reactions and systemic gallium accumulation suggest limitations for GaP in chronic neural device applications.
  • Further research is needed to improve the biocompatibility of nanostructured materials for neural interfaces.