Straight from the horses mouth …
Two people out of 28,000 had a problem with their HiRes 90k cochlear implant and they were both re-implanted with the same brand. [Update: whether these re-implantations were 'successful' is not confirmed] The recall of the HiRes 90K cochlear implant is over and recipients in the US are waiting on the FDA to complete their paperwork. You can read about the root cause of the failure and voluntary recall in this letter from Advanced Bionics …
Source: A letter from Advanced Bionics to the Ministry of Health Malaysia, Medical Device Control Division, dated 11/22/2010
Source: A letter from Advanced Bionics to the Ministry of Health Malaysia, Medical Device Control Division, dated 11/22/2010