Journal
INTERNATIONAL JOURNAL OF ANTENNAS AND PROPAGATION
Volume 2015, Issue -, Pages -Publisher
HINDAWI LTD
DOI: 10.1155/2015/918698
Keywords
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Funding
- Academy of Finland [265768, 258460, 264947]
- Jane and Aatos Erkko Foundation
- Finnish Funding Agency for Technology and Innovation (TEKES)
- Academy of Finland (AKA) [264947, 265768, 258460, 264947, 265768, 258460] Funding Source: Academy of Finland (AKA)
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Assessment of intracranial pressure (ICP) is of great importance in management of traumatic brain injuries (TBIs). The existing clinically established ICP measurement methods require catheter insertion in the cranial cavity. This increases the risk of infection and hemorrhage. Thus, noninvasive but accurate techniques are attractive. In this paper, we present two wireless, batteryless, and minimally invasive implantable sensors for continuous ICP monitoring. The implants comprise ultrathin (50 mu m) flexible spiral coils connected in parallel to a capacitive microelectromechanical systems (MEMS) pressure sensor. The implantable sensors are inductively coupled to an external on-body reader antenna. The ICP variation can be detected wirelessly through measuring the reader antenna's input impedance. This paper also proposes novel implant placement to improve the efficiency of the inductive link. In this study, the performance of the proposed telemetry system was evaluated in a hydrostatic pressure measurement setup. The impact of the human tissues on the inductive link was simulated using a 5mm layer of pig skin. The results from the in vitro measurement proved the capability of our developed sensors to detect ICP variations ranging from 0 to 70 mm Hg at 2.5 mm Hg intervals.
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