| 摘要 |
Apparatus and methods for removing cerebral spinal fluid (CSF) from a CSF space of a patient at constant volumetric rates rely on the intermittent timed or controlled opening of on-off and other control valves. When using valves, the volume of fluid drained may be measured to time the opening and closing of the valves. Alternatively, the valves can be used to control into and/or out of an accumulator, where the accumulator is drained on a periodic timed basis to achieve constant drainage over a one day or other predetermined time period. Such controlled flow volumes may also be achieved using positive displacement pumps which are operated for predetermined time intervals during each one day or other predetermined time period.
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