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A non-invasive CSF flowmeter.

M Numoto·M Hara·T Sakai·C Kadowaki·K Takeuchi
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Abstract

A new non-invasive method for quantitative measurement of cerebrospinal fluid (CSF) flow in the ventriculo-peritoneal shunt tubing, used in hydrocephalus, has been developed. It is an implantable device which produces a bubble in the shunt tubing by electrolysis. This bubble is then detected in the tubing by an electrode arrangement using electric impedance or ultrasonically using a Doppler probe. The energy for electrolysis is supplied by extracorporeal high-frequency transmission. The CSF flow rate is calculated by the velocity of bubble flow in the tubing. CSF flow rates, ranging from 0.01 to 1.00 ml/min, have been measured in animal experiments with statistically good accuracy. In 11 clinical cases a flow range of between 0.01 and 1.93 ml/min have been observed.

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AnimalsBiomedical EngineeringCerebrospinal Fluid ShuntsHumansHydrocephalusMonitoring, PhysiologicRheologyComparative StudyJournal Article

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M Numoto, M Hara, T Sakai, C Kadowaki, K Takeuchi. A non-invasive CSF flowmeter.. https://doi.org/10.3109/03091908409032079

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