The complaint device was returned for evaluation.Incoming visual inspection did not identify any anomalies.Technical visual inspection did not identify any anomalies.Device evaluation found that the relief hole was clogged and the intermittent timing assembly was bad.This confirmed the reported event.The timing assembly was replaced and adjusted.The relief hole was cleaned.The device was tested on a pump and passed the gauge, leak test - supply/patient side, regulation test, and visual inspection.The root cause for the reported repeated failures was determined to be the aged parts that were replaced.This type of event will continue to be monitored.
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