The device was returned to zoll medical corporation; the customer's report was observed during review of the device's history log.The device was put through extensive testing which included bench handling and full ecg functional testing using a simulator without duplicating the malfunction.The monitor board was replaced to reduce the probability of reoccurrence.The device passed the final test procedure, was recertified, and returned to the customer.Analysis for reports of this type has not identified an increase in trend.
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