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    • 18. 发明授权
    • Hydrocephaly treatment device including a variable impedance filter
    • 脑脊液治疗装置包括可变阻抗滤波器
    • US4605395A
    • 1986-08-12
    • US570686
    • 1984-01-13
    • Christian S. RoseJacques Lacombe
    • Christian S. RoseJacques Lacombe
    • A61B17/00A61M27/00A61M5/00
    • A61M27/006
    • To treat hydrocephaly, an intracranial catheter is implanted in the head. It is connected to a tube fitted with a non-return valve and serves to divert the flow of cephalo-rachidian liquid to the peritoneum or to the right auricle of the heart. In accordance with the invention a hydraulic filter of non-linear variable impedance is connected in the tube in series with the valve. The filter maintains an average flow rate of the cephalo-rachidian liquid close to the physiological flow rate, but prevents sudden rushes of fluid flow, thereby permitting the intracranial pressure to vary in the short term in the normal manner over a characteristic period of about one second, while preventing said pressure from rising slowly in the long term, e.g. over a characteristic period of about one minute. This is done by a bead (160) which is housed in a cavity (161) extending between a proximal orifice (111) and a distal orifice (136). The distal orifice constitutes a leaky valve seat for the bead.
    • 为了治疗脑积水,将颅内导管植入头部。 它连接到装有止回阀的管道,用于将头血管液体的流动转移到腹膜或心脏的右耳廓。 根据本发明,非线性可变阻抗的液压过滤器与阀串联连接在管中。 过滤器保持头血管液体的平均流速接近生理流速,但是防止流体流动的突然的冲击,从而允许颅内压在短期内以正常方式在约1的特征期内变化 第二,在长期防止压力上升缓慢的同时, 超过一分钟的特征期。 这通过容纳在在近端口(111)和远端口(136)之间延伸的空腔(161)中的胎圈(160)来完成。 远端口构成了用于胎圈的泄漏阀座。