Engineering thermal dissipation and power budgeting in active cranial implants to prevent biological tissue hyperthermia.
Cortical neurons are exquisitely sensitive to thermal elevations: sustained temperature increases exceeding 1.0°C cause protein denaturation, blood-brain barrier leakage, and neuronal cell death.
International standards for active implantable medical devices mandate that implant surfaces in direct contact with tissue must never exceed a 1.0°C rise above baseline physiological temperature (37.0°C) under normal or single-fault operating conditions.
To comply with thermal limits, the entire 1,024-channel BCI processor must operate within an ultra-strict power budget under 15 milliwatts, utilizing sub-threshold circuit design and conformal titanium hermetic heat spreading.