The Journal of International Advanced Otology
Invited Review

Why Pre-Curved Modiolar Hugging Electrodes Only Cover The Basal Turn of The Cochlea and Not Beyond that?


MED-EL GmbH, R&D, Innsbruck, Austria

J Int Adv Otol 2018; 14: 376-381
DOI: 10.5152/iao.2018.5831
Read: 9 Downloads: 1 Published: 03 September 2019



The question of why pre-curved modiolar hugging (MH) electrodes only cover the basal turn of the cochlea and not beyond that is unanswered yet in the CI field. Therefore the aim of this article is to show what the practical limitations are with the pre-curved MH electrode design in not being able to fabricate beyond one full turn. Every CI electrode design needs a metal mold with grooves for placing the platinum wires and for injecting with the silicone elastomer. Limitations in making a mold with groove that goes beyond one full turn of curvature along with the mechanical deformation of the curved silicone elastomer, prevents making a pre-curved MH electrode beyond one full turn. Electrode tip fold-over, electrode scalar deviation and the inconsistent electrode to modiolus wall proximity are the reported issues with this electrode type which does not help by any means to the operating surgeon and the pediatric candidates especially. If intra-operative imaging is recommended to confirm the proper placement of the electrode for one particular electrode design, then how many clinics in the world may have this facility and is it ethical to put the patient under more radiation risk are the natural questions that needs to be answered in the interest of the patient. Every CI brand should come out of their marketing philosophy and innovate what is essential in bringing the full benefit of the device to the patients.

Cite this article as
: Dhanasingh A. Why pre-curved modiolar hugging electrodes only cover the basal turn of the cochlea and not beyond that?  J Int Adv Otol 2018; 14(3): 376-81.

ISSN1308-7649 EISSN 2148-3817