Investigation: visual inspection: no significant deformations or damages of the valve were detected.Permeability test: a permeability test has indicated that the valve has a blockage.Results: finally we have dismantled the valve.Inside the valve we have found a build up of substances (likely protein).Based on our investigation, we confirm the presence of occlusion in the valve, likely due to the deposits observed in the valve.Due to occlusion it was not possible to test for for over drainage, however it can be postulated that the deposits could have temporarily led to a state of overdrainage in the past.As described in our literature, the problem encountered in one of the known inevitable risks of hc therapy by shunt implants.
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