Alexander J. Weir, Yeong Y. Lee, Kenneth E.L. McColl
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Anisotropic magneto-resistive sensor, gastro-oesophagealjunction, squamo-columnar junction.
Understanding the physiology of body systems through in vivo distance and positional measurement in narrow en- closed spaces presents several major challenges. A tech- nique using a 3-axis anisotropic magneto resistive (AMR) sensor array is reported which has been developed to pro- vide 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 po- sitional information in vivo. The device is used to measure distance along a string of sensors relative to a small mag- net 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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