Todt Ingo, Basta Dietmar, Seidl Rainer, Ernst Arne
Department of Otolaryngology, Unfallkrankenhaus Berlin, 12683 Berlin, Germany.
ScientificWorldJournal. 2012;2012:126767. doi: 10.1100/2012/126767. Epub 2012 Oct 22.
To observe the intracochlear behavior of a cochlear implant electrode insertion technique (called "pullback") in temporal bones. Study Design. Experimental. Settings. Tertiary referral center.
The change of the intracochlear electrode position was investigated under various conditions of an electrode pullback (N = 54) in 9 radiologically, size-estimated temporal bones (TBs). Those TBs were prepared by removal of the cochlear scalar roof to apply digital video capture procedures to monitor the pullback procedures. The digitally captured pictures were analyzed with specific software.
An optimal pullback of the electrode varied between 1.37 mm and 2.67 mm. While a limited pullback is without risk, an extended pullback bears the risk of removing the electrode tip out of its initial position or out of the cochlea. A correlation between cochlear size and the amount of pullback was not found.
An initial insertion to the first or the second marker on the electrode followed by a limited pullback of about 1.37 mm to 1.5 mm can be recommended to achieve an optimized perimodiolar position. A pullback of up to two marker positions bears the risk of removing the electrode tip out of its initial position.
观察人工耳蜗电极插入技术（称为“回拉”）在颞骨内的耳蜗内行为。研究设计。实验性研究。研究地点。三级转诊中心。
在9个经放射学估计大小的颞骨（TBs）中，研究了在各种电极回拉条件下（N = 54）耳蜗内电极位置的变化。通过去除耳蜗螺旋板顶盖来制备这些颞骨，以便应用数字视频捕获程序来监测回拉过程。使用特定软件对数字捕获的图片进行分析。
电极的最佳回拉范围在1.37毫米至2.67毫米之间。虽然有限的回拉没有风险，但过度回拉有将电极尖端移出其初始位置或移出耳蜗的风险。未发现耳蜗大小与回拉量之间存在相关性。
建议先将电极插入到电极上的第一个或第二个标记处，然后进行约1.37毫米至1.5毫米的有限回拉，以实现优化的蜗轴周围位置。回拉多达两个标记位置有将电极尖端移出其初始位置的风险。
