Ordonez F, Riemann C, Mueller S, Sudhoff H, Todt I
Department of Otolaryngology, Head and Neck Surgery, Klinikum Bielefeld , Bielefeld , Germany.
Acta Otolaryngol. 2019 Oct;139(10):860-865. doi: 10.1080/00016489.2019.1640391. Epub 2019 Jul 12.
Electrode insertion into the cochlea can cause significant pressure changes inside the cochlea with assumed effects on the cochlea's functionality regarding residual hearing. Model-based intracochlear pressure (ICP) changes were performed statically at the cochlear helix. The aim of this study was to observe dynamic pressure measurements during electrode insertion directly at the cochlear implant electrode. The experiments were performed in an uncurled cochlear model that contained a volume value equivalent to a full cochlea. A microfibre pressure sensor was attached at one of two positions on a cochlear implant electrode and inserted under different insertional conditions. We observed the ICP increase depending on the insertional depth. A sensor-position-specific pressure change is insertional-depth dependent. Interval insertion did not lead to a lower peak insertional ICP. In contrast to the static pressure-sensor measurement in the artificial model's helix, a dynamic measurement directly at the electrode shows the pressure profile to increase based on the insertional depth. A mechanical traumatic relevance of the observed pressure values cannot be fully excluded.
将电极插入耳蜗会导致耳蜗内部出现显著的压力变化，这可能会对耳蜗关于残余听力的功能产生影响。基于模型的耳蜗内压力（ICP）变化是在耳蜗螺旋处静态进行的。本研究的目的是直接在人工耳蜗电极处观察电极插入过程中的动态压力测量。实验在一个展开的耳蜗模型中进行，该模型的体积值等同于完整的耳蜗。一个微纤维压力传感器附着在人工耳蜗电极的两个位置之一，并在不同的插入条件下插入。我们观察到ICP随插入深度增加。特定传感器位置的压力变化取决于插入深度。间隔插入并不会导致较低的插入ICP峰值。与人工模型螺旋处的静态压力传感器测量不同，直接在电极处进行的动态测量显示压力分布随插入深度增加。不能完全排除所观察到的压力值具有机械创伤相关性。
