Height: 84 cm.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: in order to verify the presumed "non-adjustability", we tried to adjust the valve to all pressure levels, both upwards and downwards.The adjustment test has shown that the progav 2.0 is adjustable.Braking force and brake function test: the investigation of the braking force of the progav 2.0 valve showed the brake functions fully operational and the braking force is within the given tolerances.Results: first, we performed a visual inspection of the valve.No significant deformations or damages of the valve were detected during the visual inspection.Further, we tested the permeability of the progav 2.0.The test has shown that the valve was permeable.The suspected occlusion cannot be confirmed.In order to verify the presumed "non-adjustability", we tried to adjust the valve to all pressure levels, both upwards and downwards.The test has shown that the valve is adjustable to all pressure ranges.We then measured the braking function and the braking force.With the help of the brake force meter, the function of the brake on the progav 2.0 could be proven without any problems.The braking force of 550 g was also within the specification.In order to verify whether the valve examined here possibly was influenced by the known risks of hydrocephalus therapy, such as natural substances in the cerebrospinal fluid (protein, blood or tissue particles), we finally opened the valve.Based on our investigation, we are unable to substantiate the claim of occlusion or non-adjustability.The progav 2.0 operates within the specified tolerances and is adjustable to all settings as specified.However, we suspect that the deposits found inside the valve could have temporarily impaired the function.Deposits due to natural substances in the cerebrospinal fluid, e.G.Protein, blood or tissue particles are among the known and inevitable risks of hydrocephalic therapy.Nevertheless, we can exclude a defect at the time of release.The valve met all specifications of the final inspection when released from christoph miethke (b)(4).Further actions: no further actions are required in our point of view.
|