A facility reported that a patient was implanted with a certas valve w/sg on an unknown date with a setting of 6 for a vp shunt.Initially, everything was fine.A decision at some point was made to change the setting to 7 and that was also fine.At some point another decision was made to dial the valve back to 6 and that is when the issue occurred.No matter what programmer was tried, the valve would not adjust.The decision was made to replace the valve.The valve is being sent back for evaluation.
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The certas valve was returned for evaluation: failure analysis - the position of the cam when valve was received was at setting 5.The valve was visually inspected; no defects were noted.The valve was hydrated.The valve was leak tested and no leaks noted.The valve passed the test for programming, occlusion, reflux, siphon guard 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 due biological debris and protein buildup interfering with the valve mechanism, at the time of the investigation no programing issues were noted.
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