[Effect of the anti-siphon device (ASD) on the function of various hydrocephalus drainage systems in the child].

Flow rate studies on various membrane and slit valve shunt combinations in the upright (hanging) position were carried out to compare their function with and without an Anti-Siphon-Device (ASD) in relationship to various proximal pressures and various distal catheter lengths. Advantages and disadvantages of the numerous valve types and shunt combinations and the optimal position of the ASD are established. The necessity of an ASD in every shunt is experimentally verified and theoretically discussed.