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Sensors 2014, 14(8), 13851-13862; doi:10.3390/s140813851

A Capacitive Touch Screen Sensor for Detection of Urinary Tract Infections in Portable Biomedical Devices

Department of Micro and Nano Systems Technology, Faculty of Technology and Maritime Sciences, Buskerud and Vestfold University College, Postboks 2242, N-3103 Kongsberg, Norway
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Received: 1 June 2014 / Revised: 2 July 2014 / Accepted: 18 July 2014 / Published: 30 July 2014
(This article belongs to the Section Biosensors)
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Abstract

Incidence of urinary tract infections (UTIs) is the second highest among all infections; thus, there is a high demand for bacteriuria detection. Escherichia coli are the main cause of UTIs, with microscopy methods and urine culture being the detection standard of these bacteria. However, the urine sampling and analysis required for these methods can be both time-consuming and complex. This work proposes a capacitive touch screen sensor (CTSS) concept as feasible alternative for a portable UTI detection device. Finite element method (FEM) simulations were conducted with a CTSS model. An exponential response of the model to increasing amounts of E. coli and liquid samples was observed. A measurable capacitance change due to E. coli presence and a tangible difference in the response given to urine and water samples were also detected. Preliminary experimental studies were also conducted on a commercial CTSS using liquid solutions with increasing amounts of dissolved ions. The CTSS was capable of distinguishing different volumes of liquids, also giving an exponential response. Furthermore, the CTSS gave higher responses to solutions with a superior amount of ions. Urine samples gave the top response among tested liquids. Thus, the CTSS showed the capability to differentiate solutions by their ionic content. View Full-Text
Keywords: touch screen sensor; urinary tract infection; capacitance detection; portable biomedical devices touch screen sensor; urinary tract infection; capacitance detection; portable biomedical devices
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This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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MDPI and ACS Style

Honrado, C.; Dong, T. A Capacitive Touch Screen Sensor for Detection of Urinary Tract Infections in Portable Biomedical Devices. Sensors 2014, 14, 13851-13862.

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