Manrique Manuel, Picciafuoco Sebastián, Manrique Raquel, Sanhueza Ignacio, Domínguez Pablo, Pérez Nicolás, Zubieta José Luis, de Abajo Jorge
*Otorhinolaryngology Department, University Clinic of Navarra; and †Radiology Department, University Clinic of Navarra, Pamplona, Spain.
Otol Neurotol. 2014 Apr;35(4):619-28. doi: 10.1097/MAO.0000000000000284.
Evaluate, based on morphologic and histologic parameters, the atraumaticity of 2 electrode arrays implanted in 10 human temporal bones.
Atraumatic surgery and electrode arrays are current topics in otologic surgery. The preservation of cochlear anatomy and its functions is a priority and morphologic evaluation of the surgical trauma is essential to continue improving in this field.
Ten preserved human temporal bones (TB) without anatomic alterations were used in this study. They were divided into 2 groups of 5, and atraumatic surgery was performed to insert HiFocus 1J (group A) and HiFocus Helix (group B) electrode arrays. Anatomic comparisons were performed using computed tomography and histologic analysis.
Group A: the mean length for the cochlear longitudinal axis was 10.30 mm, and the cochlear transversal axis was 7.2 mm. Scala tympani insertion was achieved in 4/5 TB studied, with a mean depth and angle of insertion of 19.2 mm and 325.5°, respectively. Lateral location of the electrode array was achieved in all specimens. No significant correlation was observed between these dimensions and depth of insertion. Group B: the mean length for the cochlear longitudinal axis was 9.52 mm, and cochlear transversal axis was 6.38 mm. Scala tympani insertion was achieved in 4/5 TB studied, with a mean depth and angle of insertion of 17.5 mm and 352°, respectively. Modiolar location of the electrode array was achieved in all specimens. A positive correlation was established between the linear and angular insertion depths (p = 0.044).
In summary, it is safe to state that neither electrode array shows significant insertion trauma.
基于形态学和组织学参数，评估植入10块人类颞骨中的2种电极阵列的无创伤性。
无创伤手术和电极阵列是耳科手术中的当前热门话题。保留耳蜗解剖结构及其功能是首要任务，手术创伤的形态学评估对于该领域的持续改进至关重要。
本研究使用了10块无解剖学改变的保存人类颞骨。将它们分为两组，每组5块，进行无创伤手术以插入HiFocus 1J（A组）和HiFocus Helix（B组）电极阵列。使用计算机断层扫描和组织学分析进行解剖学比较。
A组：耳蜗纵轴的平均长度为10.30毫米，耳蜗横轴为7.2毫米。在所研究的5块颞骨中有4块实现了鼓阶插入，平均插入深度和角度分别为19.2毫米和325.5°。所有标本中电极阵列均位于外侧。这些尺寸与插入深度之间未观察到显著相关性。B组：耳蜗纵轴的平均长度为9.52毫米，耳蜗横轴为6.38毫米。在所研究的5块颞骨中有4块实现了鼓阶插入，平均插入深度和角度分别为17.5毫米和352°。所有标本中电极阵列均位于蜗轴位置。线性和角度插入深度之间建立了正相关（p = 0.044）。
总之，可以有把握地说，两种电极阵列均未显示出明显的插入创伤。
