The invention provides an array of electrodes, suitable for use as an auditory prosthesis. The array comprises an electrode body formed from an electrically insulating flexible material, preferably at least one annulus of an electrically insulating flexible material which is formed separately from the...http://www.google.de/patents/US4961434?utm_source=gb-gplus-sharePatent US4961434 - Array of recessed radially oriented bipolar electrodes
