Mr. Andrew Lingley Profile

Andrew Lingley

at Univ of Washington

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Proceedings Article | 21 August 2009 Paper

Functional modular contact lens

Angela Shum, Melissa Cowan, Ilkka Lähdesmäki, Andrew Lingley, Brian Otis, Babak Parviz

Proceedings Volume 7397, 73970K (2009) https://doi.org/10.1117/12.827720

KEYWORDS: Sensors, Glucose, Electrodes, Polymers, Hydrogen, Contact lenses, Glasses, Microfabrication, Platinum, Oxidation

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Tear fluid offers a potential route for non-invasive sensing of physiological parameters. Utilization of this potential depends on the ability to manufacture sensors that can be placed on the surface of the eye. A contact lens makes a natural platform for such sensors, but contact lens polymers present a challenge for sensor fabrication. This paper describes a microfabrication process for constructing sensors that can be integrated into the structure of a functional contact lens in the future. To demonstrate the capabilities of the process, an amperometric glucose sensor was fabricated on a polymer substrate. The sensor consists of platinum working and counter electrodes, as well as a region of indium-tin oxide (ITO) for glucose oxidase immobilization. An external silver-silver chloride electrode was used as the reference electrode during the characterization experiments. Sensor operation was validated by hydrogen peroxide measurements in the 10- 20 μM range and glucose measurements in the 0.125-20 mM range.

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