| 摘要 |
The present invention relates to an implantable drainage device for treating hydrocephalus. For this purpose, it comprises a first pressure regulating valve (1; 40, 42; 52, 57) in series with a flow regulating valve (2; 41, 44; 53, 57), and a second pressure regulating valve (3; 46) in parallel with the said flow regulating valve, the second pressure regulating valve having an opening pressure differential greater than that of the first. <IMAGE>
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