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Conformable, Stretchable Sensor To Record Bladder Wall Stretch
journal contribution
posted on 2019-01-24, 09:13 authored by Stuart Hannah, Pauline Brige, Aravind Ravichandran, Marc RamuzA soft, conformable, biocompatible
strain sensor based on ultra-thin
stretchable electronics is reported. The sensor comprises gold thin
films patterned on a 50 μm thick polyurethane substrate to produce
resistive-based strain sensors for monitoring bladder stretch. The
sensor responds linearly as a function of strain from 0 to 50%, with
an increasing sensitivity as a function of sensor length. The sensor
displays good stability with very little hysteresis when it is subjected
to cycling between 0 and a maximum strain of 50%, with the largest
deviation between 0 and 50% strain of ∼19% after 100 cycles
attributed to the sensor with the longest length (6 mm) because it
physically stretches by a greater distance than sensors with a shorter
length. “Breaking” tests on the sensor reveal that shorter
sensors can withstand higher maximum strains than longer sensors.
A biocompatible hydrogel adhesive is used to attach sensors in vitro
to the outside wall of a pig’s bladder, and sensor performance
is studied with respect to repeated bladder filling and emptying to
investigate stretch changes. By monitoring bladder stretch and thus
volume noninvasively, the sensor provides a route for developing new
treatment options for various urological conditions.
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stretchable electronicspolyurethane substratesensor displayssensor length100 cyclesbiocompatible strain sensorbiocompatible hydrogelStretchable Sensorsensor performancetreatment options50 μ mmonitoring bladder stretchRecord Bladder Wall Stretchurological conditionsresistive-based strain sensorsstretch changesvolume noninvasively
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