Measuring Movement and Location in Enclosed Spaces using 3-Axis Anisotropic Magneto Resistive Sensor Array

Alexander J. Weir, Yeong Y. Lee, and Kenneth E.L. McColl


Anisotropic magnetoresistive sensor, gastrooesophageal junction, squamocolumnar junction


Understanding the physiology of body systems through in-vivo distance and positional measurement in narrow enclosed spaces presents several major challenges. A technique using a 3-axis anisotropic magneto resistive (AMR) sensor array is reported which has been developed to provide continuous real-time monitoring of the position of the gastro-oesophageal squamo-columnar junction (SCJ) for the study of the pathology of the upper gastrointestinal (GI) tract. A technical review is provided of the AMR sensor array for the measurement of mm distances to provide positional information in-vivo. The device is used to measure distance along a string of sensors relative to a small magnet that is endoscopically clipped on to the SCJ. The probe consists of an array of 32 sensors mounted on a flexible printed circuit board within a silicone tube and provides a total measurement distance of 217 mm.

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