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The Toyota production system and cochlear implants: methodology for improved patient safety and cost containment

The reliability of the device implantation has greatly improved since 1994, when the device was officially approved as a medical device. We compared audiological data for the two groups of patients; one group has used the device for more than 10 years and the other for less than 10 years. There were no marked differences in any of the parameters examined. In both groups, a hearing level improvement of 36 dB was obtained 3 months postoperatively and at the most recent examination the improvement decreased to 21 dB. However, the device affords socially adequate hearing. In none of the patient deterioration was bone conduction caused by use of the device noted.