Wearable monitoring of lumbar spine curvature by inertial and e-textile sensory fusion

• Published in: 2010 Annual International Conference of the IEEE Engineering in Medicine and Biology Vol. 2010; pp. 6373 - 6376
• Main Authors: Bartalesi, R, Lorussi, F, De Rossi, D, Tesconi, M, Tognetti, A
• Format: Conference Proceeding Journal Article
• Language: English
• Published: United States IEEE 01-01-2010
• Subjects: Accelerometers; Back; Biomedical monitoring; Biosensing Techniques - methods; Equipment Design; Humans; Monitoring; Monitoring, Ambulatory - methods; Piezoresistance; Spinal Curvatures; Spine; Textiles
• ISBN: 1424441234; 9781424441235
• ISSN: 1094-687X; 1557-170X; 1558-4615
• DOI: 10.1109/IEMBS.2010.5627294

This paper describes the design, the development and the preliminary testing of a wearable system able perform a real time estimation of the local curvature and the length of the spine lumbar arch. The system integrate and fuse information gathered from textile based piezoresistive sensor arrays and tri-axial accelerometers. E-textile strain sensing garments suffer from non-linearities, hysteresis and long transient, while accelerometers, used as inclinometers, present biased values and are affected by the system acceleration due to subject movements. In this work, focused on the wearability and comfort of the user, we propose a fusion of the information deriving from the two class of sensors to reduce their intrinsic errors affecting measurements. Comparative evaluation of system performances with stereophotogrammetric techniques shows a 2% error in lumbar arch length reconstruction.