Risks of using siphon-reducing devices.

Reducing the cerebrospinal flow is the task of siphon-reducing devices (SRD). This paper shows test results with SRD, with special reference to the aspect of dysfunction of shunt valves in combination with anti-siphon. The local influences acting on the anti-siphon at the place of implantation and the dependence of the pressure range were examined as possible causes of dysfunction.