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Anti-siphon devices and gravitational-assisted valves have been introduced to counteract the effects of overdrainage after implantation of a shunt system. The study examined the flow performance of two gravitational-assisted valves (shunt assistant - SA and programmable shunt assistant - proSA, Miethke &amp; Co. KG, Potsdam, Germany) in an in vitro shunt laboratory with and without motion.

In vitro performance of the fixed and adjustable gravity-assisted unit with and without motion—evidence of motion-induced flow