Therapeutic hypothermia reduces cortical inflammation associated with utah array implants

Area of Science:

• Neuroscience
• Biomedical Engineering
• Surgical Innovation

Background:

• Brain-computer interfaces (BCIs) offer functional restoration but face challenges with long-term implantable microelectrode performance.
• Inflammation, oxidative stress, and blood-brain barrier disruption negatively impact electrode signal integrity and longevity.
• Developing strategies to mitigate these biological responses is crucial for advancing BCI clinical applications.

Purpose of the Study:

• To investigate the neuroprotective effects of localized therapeutic hypothermia (TH) at the microelectrode insertion site.
• To determine if TH can modulate inflammatory and apoptotic pathways, thereby improving long-term electrode performance.
• To assess the feasibility of a custom system for delivering controlled TH during neuroprosthetic surgery.

Main Methods:

• A custom thermoelectric system was designed to deliver localized TH to the cortical implant site in rats.
• Utah microelectrode arrays (UMEA) were implanted in Sprague-Dawley rats, with one group receiving two hours of TH post-implantation.
• mRNA expression of inflammation and apoptosis markers was analyzed at multiple time points (48h, 72h, 7d, 14d) post-implantation.

Main Results:

• The custom TH system successfully delivered localized cooling, confirmed by finite element modeling.
• A single application of TH post-UMEA insertion significantly reduced the acute inflammatory response.
• Key inflammatory cytokines and chemokines showed reduced expression in the TH-treated group.

Conclusions:

• Acutely applied therapeutic hypothermia is effective in mitigating acute inflammation following intracortical electrode implantation.
• This localized cooling strategy shows promise for enhancing the performance and longevity of neuroprosthetic devices.
• TH represents a potential neuroprotective intervention to improve outcomes in BCI research and clinical translation.