Variations in microanatomy of the human cochlea.
Bottom Line: At the lateral region, the height decreased significantly at the beginning of the second turn.We found a correlation between the length of the RC and that of the ST.These differences could have considerable implications for approaches to the design of CI arrays, especially in terms of their ability to preserve residual hearing during insertion of the electrode array.
Affiliation: Cluster of Excellence Hearing4all, Institute of AudioNeuroTechnology and Department of Experimental Otology, Ear, Nose, and Throat Clinics, Hannover Medical University, Hannover, 30625, Germany.Show MeSH
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Mentions: To further quantify the error of this analytical solution, the prediction based on the equation was compared with the actual lengths from all the 16 cochleae used for the 360° and 720° insertion angle. For the lateral wall position, the mean relative difference between actual and predicted values (prediction error) for 360° was 1.9 ± 1.4%; for 720° it was 2.7 ± 1.8%. For the central position and 360°, the prediction error was 2.2 ± 1.9%, and for 720° it was 2.3 ± 1.6%. In total, the prediction errors were larger for the lateral positions and the deep insertions. The cochleae with extreme values for the distance–angle relation (Fig. 11) gave the largest prediction errors. The maximal prediction error found was 5.4%. A prediction error of such low magnitude demonstrates that the analytical solution represents a very good estimate of possible implant insertion depths.
Affiliation: Cluster of Excellence Hearing4all, Institute of AudioNeuroTechnology and Department of Experimental Otology, Ear, Nose, and Throat Clinics, Hannover Medical University, Hannover, 30625, Germany.