Investigation visual inspection no significant deformations or damage of the valve was detected during the visual inspection.Permeability test a permeability test has shown that the valve is permeable.Adjustment test this is a fixed pressure valve.An adjustment test is not applicable.Braking force and brake function test this is a fixed pressure valve.A braking force and brake function test is not applicable.Computer controlled test to investigate the claim of over-drainage, the opening pressure is measured using a miethke computer controlled testing apparatus which simulates a cerebrospinal fluid flow.The valve is tested in the vertical position.The results show that the valve is operating within the accepted tolerance in the vertical position.Results first, we performed a visual inspection of the shunt assistant.No significant deformations or damage of the valve were detected during the visual inspection.Next, we tested the permeability of the valve.The valve was shown to be permeable.Then we carried out a computer controlled simulated flow test.The measured opening pressure was within the accepted tolerance in the vertical positions.Finally, we have dismantled the valve.Inside the valve we have found slightly build-up of substances (likely protein).Based on our investigation, we are unable to substantiate the claim of over-drainage.At the time of our investigation, the valve was operating within the specified tolerances.The observed deposits in the valve could have been a cause of the valve's temporary malfunction.As described in the scientific literature, the problem encountered is one of the known, inevitable risks of hc-therapy by shunt implants.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.
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