Passive Implantable Wireless Intracranial Pressure Monitoring Based on Near Field Communication

This work proposes a passive implantable wireless Intracranial Pressure (ICP) monitoring system based on Near Field Communication (NFC). An improved air pouch is used to convert the cerebral spinal fluid (CSF) pressure into the air pressure, which brings better biocompatibility and lower damage to brain tissues compared with the previous work. The proposed implanted wireless ICP monitoring device is battery-free, which further reduces the device size and improves the safety and truly achieves the long-term ICP monitoring. The proposed system has achieved a measurement accuracy of 0.25 mmHg and a resolution of 0.1 mmHg, which is better than Codman whose resolution is 1mmHg, and responds faster than Codman which lags about 8 seconds.