Abstract
A very compact and easily transportable optical-fiber sensor for the detection of reflux from the duodenum into the stomach has been developed. The working principle is based on the spectrophotometric properties of the bile, which is always present in the reflux. It makes use of two light-emitting diodes (for signal and reference, respectively) and of a special electronic circuit which processes the signals and provides the readout on a display. A suitable probe, specially finalized for in vivo measurements, was designed. Plastic fiber bundles are used in order to obtain the best solution in terms of signal levels and price. Measurements with the proposed sensor were performed on several patients. A comparison with the traditional indirect method, based on a change in acidity inside the stomach, showed the greater suitability of the optical sensor for detection of entero-gastric reflux.
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