[Surgical approaches and related microsurgical anatomy about suprameatal approach: new surgical approach for cochlear implantation].

Lin chuang er bi yan hou tou jing wai ke za zhi = Journal of clinical otorhinolaryngology, head, and neck surgery

PubMedID: 17650813

Liu H, Feng Y, Chen D, Mei L, He C, Cai X. [Surgical approaches and related microsurgical anatomy about suprameatal approach: new surgical approach for cochlear implantation]. Lin Chung Er Bi Yan Hou Tou Jing Wai Ke Za Zhi. 2007;21(10):447-9.
OBJECTIVE
To study a new surgical approach for cochlear implantation.

METHOD
We operated on 8 cadaver heads (16 side) use Suprameatal approach for cochlear implantation, describe related anatomic mark.

RESULT
The electrode is passed through the suprameatal tunnel, the EAC groove, the space underneath the chorda tympani between the malleal and the long process of the incus, and the cochleostomy. Angle between tunnel and temporal imaginary line is 28.0 degrees +/- 1.3 degrees in adult, 29.0 degrees +/- 1.7 degrees in children, the location of inserting electrode into cochleostomy is (1.31 +/- 0.13) mm to round window in adult, (1.19 +/- 0.12) mm in child.

CONCLUSION
The SMA approach is a safe technique, maintaining a safe distance to facial nerve and chorda tympani. So We should make right decision in clinic.