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 including bench handling, defib cycling, environmental stress testing, and internal inspection without duplicating a malfunction to the device.The device passed the final test procedure, was recertified, and returned to the customer.Review of the device log does confirm the event described by the customer.The device experienced a fault condition while the user attempted enter defib mode by pressing the energy select button.The device would not enter the defib mode and responded with an audible user advisory tone.The device is power cycled by the user, and was capable of discharging at 200 joules.No indication of a hard failure with the device based on the log review.Analysis for reports of this type has not identified an increase in trend.
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