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 progav valve is permeable.Adjustment test the progav 2.0 valve was tested and is not adjustable through out the normal range.Braking force and brake function test.The brake functionality test has shown that the brake function is operational; however, the braking force cannot be measured due to the non-adjustability of the valve.We have dismantled the valves.Inside both valves, we have found slight build-up of substances (likely protein).Based on our investigation, we confirm the valve is non-adjustable, likely due to deposits observed inside the valves.As described in our 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 shunt system met all specifications of the final inspection when released from christoph miethke gmbh & co.Kg.
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