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

一项以健康受试者的吞咽声为样本的吞咽声分析证实，吞咽声包含复杂的元素，但通常由三个主要元素组成。通过肌电和吞咽压的测量，进一步研究了吞咽声检测吸入物的相关机制。对于吞咽声吸入物的检测，很难获得吞咽过程中物体通过气管的声音，仅用吞咽声检测吸入物也是困难的。因此，我们研究了一种通过分析吸入物吸气时湿呼气音的频率，然后分析声带振动的变化来确定咽内侵犯和吸入物是否发生微小数量的方法。我们特别关注发声过程中声带振动的变化，并试图通过分析声谱图的共振峰和基频来检测声门上轻微的变化。我们发现，共振峰与吸入和咽内侵犯的发生有一致的变化，从而表明这些分析对于未来吸入的确定是有效的。

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.