Portnoy H D, Tripp L, Croissant P D
Childs Brain. 1976;2(4):242-56. doi: 10.1159/000119621.
A study of differential pressure valves (DPV) used in the treatment of hydrocephalus was undertaken to determine their pressure-flow characteristics and compatability with the antisiphon valve (ASV). DPV could be classified into two groups: low resistance valves (LRV) and high resistance valves (HRV). The LRV maintains intraventricular pressure (IVP) near the closing pressure (CP) of the valve by permitting a high flow whenever CP is exceeded. The HRV regulates IVP by attempting to match inflow with some point on the pressure-flow curve of the valve. These characteristics were lost unless valve outlet pressure was maintained at atmospheric pressure. This could be accomplished by using a proximal DPV with an ASV at the DPV outlet, thus converting the DPV into a gauge pressure valve and preventing the 'siphon effect' seen with the use of a DPV alone.
开展了一项关于用于治疗脑积水的压差阀（DPV）的研究，以确定其压力-流量特性以及与抗虹吸阀（ASV）的兼容性。DPV可分为两组：低阻力阀（LRV）和高阻力阀（HRV）。LRV通过在超过关闭压力（CP）时允许高流量，将脑室内压力（IVP）维持在阀门的关闭压力（CP）附近。HRV通过试图使流入量与阀门压力-流量曲线上的某个点相匹配来调节IVP。除非阀门出口压力保持在大气压，否则这些特性会丧失。这可以通过在DPV出口处使用带有ASV的近端DPV来实现，从而将DPV转换为表压阀，并防止单独使用DPV时出现的“虹吸效应”。
