The Development of a Portable Aspiration Diagnostic Device Comprising a Method for Analyzing Swallowing Sounds

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An analysis of swallowing sounds using the swallowing sounds of healthy subjects as samples has verified that swallowing sounds comprise complex elements, but normally consist of three major elements. The related mechanisms were further studied by the use of an electromyogram and the measurement of the swallowing pressure.Regarding the examination of aspiration using swallowing sounds, it is difficult to obtain the sounds of objects passing through the windpipe generated during the act of swallowing, and we discovered that it is also difficult to examine cases of aspiration using only swallowing sounds.Therefore, we studied a method for determining intralaryngeal invasion and the occurrence of aspiration in minute amounts by analyzing the frequency of moist expiratory sounds during aspiration and then analyzing changes in vocal cord vibration. We focused particularly on changes in vocal cord vibration during phonation and attempted to detect minor supraglottic changes by analyzing the formant and basic frequency of the sound spectrogram. We discovered that a consistent change occurred in the formant waves in association with occurrences of aspiration and intralaryngeal invasion, thereby indicating the effectiveness of these analyses for future determinations of aspiration.