Patent ID: 8137286

Claim:
A monitoring electrode for monitoring dorsal cochlear nucleus action potentials, which is to be used in a brain surgery operation, being configured to be placed between a peduncle and a floor of a fourth ventricle and to be held onto the dorsal cochlear nucleus located between the peduncle and the floor of the fourth ventricle to monitor the dorsal cochlear action potentials, the monitoring electrode comprising: an electrode unit configured to detect the dorsal cochlear nucleus action potentials, wherein the electrode unit comprises a front face part of which is an exposed face exposed to detect the action potentials, and a covering unit comprising a front cover and a back cover made of a biocompatible resin and configured to partially cover both front and rear faces of the electrode unit with the exposed face uncovered by an opening part and protrude from a periphery of the electrode unit, the covering unit including: a round portion formed on the electrode unit and configured to facilitate an insertion of the electrode unit through a foramen of Luschka between the peduncle and the floor of the fourth ventricle, and an outer diameter shape of the covering unit having a width in a range of 3.0 mm to 3.5 mm and a length in a range of 5.5 mm to 10 mm and configured to fit in between the peduncle and the floor of the fourth ventricle, wherein the monitoring electrode comprises only a single electrode.