Assessment of intracochlear trauma caused by the insertion of a new straight research array.
Assessment of intracochlear trauma caused by the insertion of a new straight research array.
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DOI：
10.1179/1754762811y.0000000013
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发表时间：
2012-08-01
影响因子：
--
通讯作者：
Gibson, William P R
中科院分区：
文献类型：
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作者：
Mukherjee, Payal;Uzun-Coruhlu, Hilal;Gibson, William P R
目的：利用脊柱直型研究阵列（SRA）评估颅内创伤程度。背景：电声刺激（EAS）使接受者能够从人工耳蜗植入中受益，同时保留其自然的低频听力。短EAS电极的缺点是短电极提供有限的低频刺激。因此，残余听力的丧失可能需要用更长的电极重新植入。为了克服这个问题，细长直径SRA增加长度（20-25 mm）已被设计为提供一个更深的，但非创伤性insertion.METHODS：两个插入研究到颞骨进行。第一个涉及解剖耳蜗，以获得前庭阶的视图，并插入SRA和控制电极，其中微致动器用于独立于外科医生但受控的插入。高速摄影被用来记录数据。第二项研究涉及高分辨率X射线微计算机断层扫描（microCT）研究，以评估电极放置和组织保存在外科医生植入bone.RESULTS：SRA有一个平稳的插入轨迹。当插入直至遇到阻力时，平均角度插入深度为383°，如果插入到EAS使用的预定标记处，则为355°。此外，microCT数据显示，这没有造成重大的创伤或扭曲的基底膜高达20毫米deep.CONCLUSION：颞骨研究表明，SRA似乎不会造成颅内创伤，如果用作EAS电极插入深度高达20毫米。
OBJECTIVE: To assess the degree of intracochlear trauma using the Cochlear Straight Research Array (SRA). This electrode has recently been released by Cochlear on the CI422 implant.BACKGROUND: Electroacoustic stimulation (EAS) enables recipients to benefit from cochlear implantation while retaining their natural low-frequency hearing. A disadvantage of short EAS electrodes is that short electrodes provide limited low-frequency stimulation. Thus, loss of the residual hearing may require reimplantation with a longer electrode. In order to overcome this problem, the slim diameter SRA with increased length (20-25 mm) has been designed to provide a deeper, yet non-traumatic insertion.METHODS: Two insertion studies into temporal bones were undertaken. The first involved dissection of the cochlea to gain a view into the scala vestibuli and insertion of the SRA and control electrodes with a microactuator for a surgeon-independent yet controlled insertion. High-speed photography was used to record data. The second study involved a high-resolution X-ray microcomputed tomography (microCT) study to assess electrode placement and tissue preservation in surgeon-implanted bones.RESULTS: The SRA had a smooth insertion trajectory. The average angular insertion depth was 383° when inserted until resistance was encountered, and 355° if inserted to a predetermined mark for EAS use. In addition, microCT data showed that this caused no significant trauma or distortion of the basilar membrane up to 20 mms depth.CONCLUSION: Temporal bone studies show that the SRA appears to cause no intracochlear trauma if used as an EAS electrode up to 20 mm depth of insertion.