Investigation: visual inspection: no significant deformations or damage of the valves were detected during the visual inspection.Permeability test: a permeability test has shown that valves was permeable.Adjustment test: the progav 2.0 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.Results: first, we performed a visual inspection of the progav 2.0.No significant deformations or damage of the valves were detected during the visual inspection.Next, we tested the permeability and opening pressure of the valve.The valve was shown to be permeable and their opening pressures were operating within specifications.Additionally, we tested the adjustability as well as the brake functionality and brake force of the progav 2.0 valve.The valve operated as expected and met all specifications.Finally, we have dismantled the valves.There were no visible deposits observed inside the valve.Based on our investigation, we are unable to substantiate the claim of occlusion.At the time of our investigation, the valve was shown to be permeable.We can exclude a defect at the time of release.The shunt system met all specifications of the final inspection when released from christoph miethke gmbh & co.Kg.
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