Department of Otorhinolaryngology Head and Neck Surgery, Medical Faculty, University of Cologne, Cologne, Germany.
Otol Neurotol. 2019 Jan;40(1):e40-e47. doi: 10.1097/MAO.0000000000002058.
A handheld measuring probe was developed that analyzes the vibration characteristics of the stapes footplate after backward stimulation of the cochlea in round window vibroplasty. In temporal bone experiments, the measuring accuracy of the probe was tested.
In round window vibroplasty, the effectiveness of the transmitted vibrations into the inner ear is provided with limited visual and tactile information. Currently, there is no objective measuring tool available.
In five unfixed temporal bones, a floating mass transducer was coupled to the round window membrane. During the excitation with different voltage levels (0, 5, 25, 100, 300 mV root mean square) corresponding to 0, 80, 94, 106, and 116 dB equivalent ear canal sound pressure respectively, the deflections of the footplate were recorded in parallel by laser Doppler vibrometry and the measuring probe.
The probe allowed for differentiation of the coupling efficiency. The measured footplate vibrations from the excitation levels of 106 dB (and 116 dB) were statistically significant compared with the testing without excitation. The footplate deflections determined in parallel by laser Doppler vibrometry showed comparable results.
In principal, the newly developed measuring probe allows for measuring the quality of retrograde cochlear excitation in a round window vibroplasty by detecting footplate vibrations. Further developments are directed for its application in clinical, intraoperative procedures.
开发了一种手持式测量探头，用于分析圆窗鼓室声激励后镫骨底板的振动特性。在颞骨实验中，对探头的测量精度进行了测试。
在圆窗鼓室声激励中，传递到内耳的振动效果提供的视觉和触觉信息有限。目前，尚无客观的测量工具。
在五个未固定的颞骨中，将浮质量换能器耦合到圆窗膜上。在不同电压水平（0、5、25、100、300 mV 均方根）下进行激励，分别对应 0、80、94、106 和 116 dB 等效耳道声压，通过激光多普勒测振仪和测量探头同时记录底板的挠度。
探头允许区分耦合效率。与无激励测试相比，测量探头可以区分 106 dB（和 116 dB）激发水平的耦合效率。激光多普勒测振仪平行测量的底板振动也显示出可比的结果。
原则上，新开发的测量探头可以通过检测底板振动来测量圆窗鼓室声激励的逆行质量。进一步的开发旨在将其应用于临床和术中程序。
