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Background Hydrocephalus valves are potentially life-long implants. In spite of this fact a minority only of the 1400 published in vitro tests had a duration of more than 3 months, maximally 1 year. In addition, in literature tests of susceptibility on external pressures and valve body deformation, elevated CSF protein, simulated gas-sterilizations, pumping volumes and pressures, temperature variations, reflux, syphoning, in adjustable valves the reaction on electromagnetic fields, decentration during adjustment, possibility of emergent adjustment without special apparatus are sporadically available only.

23 hydrocephalus valves tested over 367–514 days