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Abstract #74162 Published in IGR 19-1
A Wireless Pressure Sensor for Continuous Monitoring of Intraocular Pressure in Conscious Animals
Bello SA; Passaglia CLAnnals of Biomedical Engineering 2017; 45: 2592-2604
An important aspect of eye health in humans and animal models of human diseases is intraocular pressure (IOP). IOP is typically measured by hand with a tonometer, so data are sparse and sporadic and round-the-clock variations are not well characterized. Here we present a novel system for continuous wireless IOP and temperature measurement in small animals. The system consists of a cannula implanted in the anterior chamber of the eye connected to pressure sensing electronics that can be worn by rats or implanted in larger mammals. The system can record IOP with 0.3 mmHg accuracy and negligible drift at a rate of 0.25 Hz for 1-2 months on a regulated battery or indefinitely at rates up to 250 Hz via RF energy harvesting. Chronic recordings from conscious rats showed that IOP follows a diurnal rhythm, averaging 16.5 mmHg during the day and 21.7 mmHg at night, and that the IOP rhythm lags a diurnal rhythm in body temperature by 2.1 h. IOP and body temperature fluctuations were positively correlated from moment-to-moment as well. This technology allows researchers to monitor for the first time the precise IOP history of rat eyes, a popular model for glaucoma studies.
Department of Electrical Engineering, University of South Florida, Tampa, FL, 33620, USA.
Full articleClassification:
5.1 Rodent (Part of: 5 Experimental glaucoma; animal models)
6.19 Telemedicine (Part of: 6 Clinical examination methods)
6.1.1 Devices, techniques (Part of: 6 Clinical examination methods > 6.1 Intraocular pressure measurement; factors affecting IOP)
