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TitleFlexible gastrointestinal motility pressure sensors based on aluminum thin-film strain-gauge arrays
Author(s)Silva, Luís Rebelo
Sousa, Paulo J.
Gonçalves, L. M.
Minas, Graça
KeywordsAluminum thin-film membrane
Pressure sensors
SU-8 diaphragm
GI motility
Peristaltic movements
Issue date18-Jun-2015
PublisherIOP Publishing
JournalJournal of micromechanics and microengineering
CitationL R Silva et al 2015 J. Micromech. Microeng. 25 074007. doi:10.1088/0960-1317/25/7/074007
Abstract(s)This paper reports on an innovative approach to measuring intraluminal pressure in the upper gastrointestinal (GI) tract, especially monitoring GI motility and peristaltic movements. The proposed approach relies on thin-film aluminum strain gauges deposited on top of a Kapton membrane, which in turn lies on top of an SU-8 diaphragm-like structure. This structure enables the Kapton membrane to bend when pressure is applied, thereby affecting the strain gauges and effectively changing their electrical resistance. The sensor, with an area of 3.4 mm2, is fabricated using photolithography and standard microfabrication techniques (wet etching). It features a linear response (R2 = 0.9987) and an overall sensitivity of 2.6 mV mmHg−1. Additionally, its topology allows a high integration capability. The strain gauges’ responses to pressure were studied and the fabrication process optimized to achieve high sensitivity, linearity, and reproducibility. The sequential acquisition of the different signals is carried out by a microcontroller, with a 10-bit ADC and a sample rate of 250 Hz. The pressure signals are then presented in a user-friendly interface, developed using the Integrated Development Environment software, QtCreator IDE, for better visualization by physicians.
Publisher version
AccessRestricted access (UMinho)
Appears in Collections:DEI - Artigos em revistas internacionais

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