(b)(4).The device was returned and evaluated.No keystrokes, programming, or use related events that indicated and/or contributed to the problem were found during event history log review.Nothing in the service history review was found that would indicate the reported problem.Device evaluated and passed the hc return instrument test / evaluation rite electrical test but failed rite functional test due to therapy monitored volume failed.External/internal inspection was performed and passed.Fluid was transferred above the rite specified limits during fill 1&2, drain 1&2 and last fill.Accuracy confirmation test was performed and failed.Temperature verification test was performed per (b)(4) and passed.Inspected door assembly and found the piston foam deteriorated and cracked door piston.Direct cause for the rite failure of therapy monitored volume failed was determined to be caused by deteriorated piston foam.The piston foam was scrapped.Device was sent to servicing.Should additional relevant information become available, a follow-up report will be submitted.
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