Investigation visual inspection scratches on the outer housing of the valve were observed through the visual inspection.No significant deformations or damage was detected.Permeability test a permeability test has shown that the progav valve is permeable.Adjustment test the progav valve was tested and is adjustable to all specified pressures.Braking force and brake function test the brake functionality test has shown that the brake function is fully operational and the braking force is within the given tolerances.Computer controlled test to investigate the claim of over/under-drainage, the opening pressure is measured using a miethke computer controlled testing apparatus which simulates a cerebrospinal fluid flow.The progav valve is operating within acceptable tolerances.Results first, we performed a visual inspection of the progav valve.No significant deformations or damage of the valve were detected during the visual inspection.Next, we tested the permeability, adjustability and opening pressure of the valve, as well as the brake functionality and brake force.The progav valve operates as expected and met all specifications.Finally, we have dismantled the valve.Inside the valve we have found slight build-up of substances (likely protein).Based on our investigation, we are unable to substantiate the claim of under-drainage.At the time of our investigation, the opening pressure of the progav valve was within the specified tolerances.However, it is possible that the deposits observed inside the valve could have caused the malfunction in the past.As described in our literature.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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