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Ultra-sensitive microfluidic wearable strain sensor for intraocular pressure monitoring

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Abstract

Wearable technologies have potential to transform healthcare by providing continuous measurements of physiological parameters. Sensors that passively monitor physiological pressure without using electronic components are ideal for wearable contact lenses because they are easy to interface with the cornea and the external environment. Here, we report a passive integrated microfluidic sensor with a novel transduction mechanism that converts small strain changes into a large fluidic volume expansion, detectable by a smart-phone camera. The optimization of the sensor architecture and material properties results in a linear and stable sensor response. We have shown that the sensor has a detection limit of <0.06% for uniaxial and <0.004% for biaxial strain. We embedded our sensor in silicone contact lenses and measured the intraocular pressure induced strain in porcine eyes in the physiological range. The sensor's continuous operation capability for >19 hours and a lifetime reaching >7 months demonstrate its potential for long-term ophthalmic monitoring applications.

Graphical abstract: Ultra-sensitive microfluidic wearable strain sensor for intraocular pressure monitoring

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Publication details

The article was received on 23 Jul 2018, accepted on 19 Sep 2018 and first published on 24 Sep 2018


Article type: Paper
DOI: 10.1039/C8LC00758F
Citation: Lab Chip, 2018, Advance Article
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    Ultra-sensitive microfluidic wearable strain sensor for intraocular pressure monitoring

    S. Agaoglu, P. Diep, M. Martini, S. KT, M. Baday and I. E. Araci, Lab Chip, 2018, Advance Article , DOI: 10.1039/C8LC00758F

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