Abstract
Elevated Intracranial pressure (ICP) is characterized as neurological problem mainly caused as a consequence of traumatic brain injuries (TBI). Early detection of increasing ICP is of great importance in management of TBI. In this paper, we present a fully implantable passive sensor for continuous wireless subdural ICP monitoring. The implantable sensor consists of a 30-turn spiral loop in parallel with a mmsize (1.4×1.4×0.8 mm3 ) microelectromechanical systems (MEMS) capacitive pressure sensor forming an LC tank. The sensor at normal air pressure resonates at 14 MHz. Wireless operation is based on near field inductive coupling between the implantable sensor and an on-body reader coil. The sensor is made on an ultra-thin (50 μm) flexible polyimide substrate making it minimally invasive for implantation. Evaluation of the designed sensor showed the capability of the highly linear pressure measurement ranging from 0 to 70 mmHg at 5-mmHg intervals.
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