Analysis of acoustic frequency and wave amplitude generated by the Oscillatory Thoracic Thixotropic Device (Diottix(r)) in human chest

Diottix(r) was calibrated at 25 Hz to achieve the frequency indicated in literature as being effective to mobilize the airways secretions. However, the amplitude and frequency of the waves generated by the equipment in different regions of the chest still need to be investigated. The objective of this study was to analyze the frequency and amplitude of waves generated by Diottix(r) in chests of healthy subjects. Diottix(r) was used in the anterior and posterior regions of the chest. The mechanical waves were captured using stethoscopes connected to electret microphones, which were connected to a digital oscilloscope. Frequency and amplitude data were recorded by the stethoscope, positioned in six points in the anterior region and six in the posterior region of the chest, following the positions commonly used in pulmonary auscultation. Signals were recorded and transferred to a computer with software for their analysis. The frequency of waves did not present a significant change (from 24.9 to 26.4 Hz). The wave amplitude in the anterior versus the posterior region in each area of the lung, the upper, middle and lower, had differences. Diottix(r) produces frequencies in the chest according to the calibrated; thus, it can be a complementary resource to bronchial hygiene maneuvers. The amplitudes of waves seem to be affected by other structures like bone parts and heart.

Diottix(r) 设备经25 Hz校准，以达到文献中记载的可有效松动气道分泌物的振动频率。不过，该设备在胸部不同区域产生的机械波的振幅与频率仍有待进一步研究。
本研究旨在分析Diottix(r) 在健康受试者胸部产生的机械波的频率与振幅。实验中将Diottix(r) 应用于受试者胸部的前侧与后侧区域。
通过连接驻极体麦克风（electret microphone）的听诊器采集机械波信号，该麦克风再与数字示波器（digital oscilloscope）相连。按照肺部听诊常用的点位布局，将听诊器分别安置于胸部前侧的6个测点与后侧的6个测点，同步记录频率与振幅数据。
采集得到的信号被传输至搭载专用分析软件的计算机进行后续分析。
研究结果显示，机械波的频率未出现显著变化，介于24.9 Hz至26.4 Hz之间。肺部上、中、下各区的前侧与后侧区域的波振幅存在差异。
Diottix(r) 在胸部产生的振动频率符合其校准设定，因此可作为支气管卫生操作的辅助干预手段。
机械波的振幅似乎会受到骨骼、心脏等其他身体结构的影响。