Routine testing confirmed that this device was installed by the customer in (b)(6) 2010 and performed to specification up to the last log entry on (b)(6) 2012.The device failed a self-test due to a low battery on the (b)(6) 2012 and remained in fault mode until (b)(6) 2013 when the device passed a self-test.An increase in voltage suggests a further pad-pak was installed during this time.Multiple manual power ups of ten minutes duration were observed in the device memory between (b)(6) 2014 and the last log entry on (b)(6) 2015.The pad-pak became depleted during this time and a further pad-pak was installed.It is reasonable to conclude that devices returned for the reported fault may be attributed to membrane failure.The ten minute time outs, the measurements taken and the excess current drain would confirm a failing membrane.During investigation the right pad-placement leds were observed tot be lit in time with the chest leds while the left pad-placement leds were observed to be lit in time with the red status led, this is a further symptom of a membrane failure.The fault could not be replicated with a new membrane fitted.The pad-pak, which contains the electrodes and batteries, is labeled for single use but the samaritan pad (b)(4) devices are for multi-use, which is why the "unknown" box has been checked in of this report.
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