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Investigation: visual inspection: no significant deformations or damage of the valve were detected during the visual inspection.Permeability test: a permeability test has shown that the valve is permeable.Computer controlled test: to investigate the claim of under-drainage, the opening pressure is measured using a miethke computer controlled testing apparatus which simulates a cerebrospinal fluid flow.The results show that the valve is operating within the accepted tolerance in the vertical position.Internal inspection : after dismantling of the valve, no deposits were found in shuntassistant 2.0.Results: based on our investigation, we are unable to substantiate the clinical claim of under-drainage.At the time of our investigation, the valve was operating within the specified tolerances.No malfunction could be determined during the examination.We can exclude a defect at the time of release.The valve met all specifications of the final inspection when released from christoph miethke gmbh & co.Kg.No further regulatory actions are required from our point of view.
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