(b)(4).
Physio-control evaluated the customer's device and verified that the event code was logged in the device's memory; however, the issue could not be duplicated during testing.
Physio then cleared the device's memory, which cleared the event code, and completed other unrelated repairs.
After observing proper device operation through functional and performance testing the unit was returned to the customer for use.
The cause of the reported issue could not be determined.
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The customer contacted physio-control to report a non-critical issue with their device.
There was no report of patient use associated with the reported event.
Upon evaluation of the customer's device, physio-control observed an event code logged in the device's memory that is indicative of a device failure that could result in a partial loss of defibrillator output energy due to a loss of the negative portion of the biphasic output waveform, resulting in a monophasic shock.
As a result, the wrong defibrillation therapy may be delivered to a patient, if it was needed.
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