Whenworking with a traditional surgical drill under the microscope thedrill tip will naturally perforate the surface through the innerflexible boney tissue interface of the cochlea with the inner membraneand protrude into the space 当在显微镜下使用传统外科钻头手术时，通常容易穿破表面柔韧的骨组织和耳蜗交界面突出的内耳膜。
