Unique device identifier (udi): (b)(4).The valve was returned for evaluation: device history record (dhr)- lot 4755552, conformed to the specifications when released to stock.Failure analysis- the valve was visually inspected; no defects were noted.The position of the cam when valve was received was at setting 3.The valve passed the test for progrmming, flushing, leaking, reflux and pressure.No root cause could be determined as the technician could not confirm any problem with the valve at the time of investigation.The possible root cause for the issue reported by the customer could be to biological debris and protein build up interfering with the valve mechanism, no occlusion issues were noted during the investigation.
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