Wireless brain pressure measurement by SAW Technology
The clinical observation of the intracranial pressure is critical for the treatment of head injuries and brain diseases. Unlike wired or catheter-like systems with high risk of infection, these sensors can be read out wirelessly through the scalp. In order to realize such systems, researchers at CTR in collaboration with a long-term industrial partner, UNISENSOR, are developing an innovative implantable pressure sensor based on surface acoustic waves (SAWs). The sensitive element is a 30µm-thick membrane made of Lithium Niobate equipped with an acoustic transducer and working on the basis of SAW echoes measurements. The system can detect pressure variations of ±0.5 Torr (mmHg) in a wide range around atmospheric pressure.