Flexible, Structured MWCNT/PDMS Sensor for Chronic Vascular Access Monitoring.
2016 IEEE SENSORS(2017)
Abstract
Graft wall pulsation amplitude sensing can provide a measure of functional status, e.g. in hemodialysis access grafts. Current implantable graft monitoring sensors require graft modification and direct bloodstream contact. We propose a new class of piezoresistive flexible pulsation sensors which can be wrapped around the graft to measure wall movement. These sensors must be highly flexible to prevent graft constriction; typical strain sensors are too rigid and the strain sensing range is too limited for this application. We describe a novel additive manufacturing (AM) method for printing polydimethylsiloxane (PDMS) with an internal porous structure, such that material compliance may be tuned anisotropically for a given sensor geometry. Prototype flexible pulsation sensors (FPS) consisting of structured PDMS with an embedded conductive PDMS sensor layer were fabricated and tested. Initial tests demonstrated reliable sensor response to 1-Hz cyclic elongation of 20%, and a sensor gauge factor of 1.0.
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Key words
chronic vascular access monitoring,piezoresistive flexible pulsation sensors,strain sensors,additive manufacturing method,polydimethylsiloxane,embedded conductive PDMS sensor layer,sensor gauge factor,cyclic elongation,MWCNT-PDMS sensor
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