MEASURING MOVEMENT AND LOCATION IN ENCLOSED SPACES USING 3-AXIS ANISOTROPIC MAGNETO RESISTIVE SENSOR ARRAY

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

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Keywords

Anisotropic magnetoresistive sensor, gastrooesophagealjunction, squamocolumnar junction.

Abstract

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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