gms | German Medical Science

57th Annual Meeting of the German Society of Neurosurgery
Joint Meeting with the Japanese Neurosurgical Society

German Society of Neurosurgery (DGNC)

11 - 14 May, Essen

Simultaneous continuous CSF drainage and pressure measurement in ventricular and lumbar drainage: Development of a new device and first clinical experiences

Simultane kontrollierte kontinuierliche Liquordrainage und Druckmessung bei Ventrikeldrainagen und lumbalen Dauerdrainagen: Geräteentwicklung und erste klinische Erfahrungen

Meeting Abstract

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  • corresponding author B.M. Hoelper - Klinik für Neurochirurgie, Klinikum Fulda
  • R. Behr - Klinik für Neurochirurgie, Klinikum Fulda

Deutsche Gesellschaft für Neurochirurgie. Japanische Gesellschaft für Neurochirurgie. 57. Jahrestagung der Deutschen Gesellschaft für Neurochirurgie e.V. (DGNC), Joint Meeting mit der Japanischen Gesellschaft für Neurochirurgie. Essen, 11.-14.05.2006. Düsseldorf, Köln: German Medical Science; 2006. DocP 03.29

The electronic version of this article is the complete one and can be found online at:

Published: May 8, 2006

© 2006 Hoelper et al.
This is an Open Access article distributed under the terms of the Creative Commons Attribution License ( You are free: to Share – to copy, distribute and transmit the work, provided the original author and source are credited.



Objective: Until now, for correct measurement of ICP via ventricular drainage, the drainage system must be closed. Furthermore, ventricular pressure during CSF drainage is defined by the height difference between the dripping chamber and the ventricle. After change of patient head position, height difference must be adapted manually. Using a lumbar drainage, continuous CSF drainage is often limited by nursing manpower. These current problems might be solved by the presented newly developed apparatus (LiquoGuard). It allows both to measure CSF-pressure using a simple ventricular or lumbar catheter and to precisely drain CSF simultaneously.

Methods: Further used pressure sensors (FreeScale MPXC2011DT1) were tested for relative and absolute accuracy as well as time-drift and compared to a reference pressure measurement device (JUMO dTrans P02) in a pressure chamber. Pressure sensor behavior was tested from low (0mmH2O) to high pressure (200mmH2O). For CSF drainage, a peristaltic pump system (Moeller LDP001) was tested in order to pump liquid continuously.

Results: Transient response from 40 to 200mmH2O were minimal for PeakTeck sensors, and a low drift over time in high and low pressure areas was recorded. Pressure peaks caused by rotation of the pump were low. The amount of pumped liquid showed a high correlation to the values calculated by the pump system.

The pump system, microprocessors and display were integrated in a casing. Tested pressure sensors were integrated in a die casting body along the external CSF drainage pathway. Pump function is regulated by the connected pressure sensors using a newly developed controlling software.

Conclusions: The presented device (LiquoGuard) is designed to allow both pressure measurement and controlled CSF drainage using ventricular or lumbar catheters. Target pressure (ventricular drainage) and target CSF amount (lumbar drainage) can be defined. Therefore, an external drip chamber is not necessary any more. Drained CSF amount can be balanced hourly to daily, pressure curves and trends (pressure and drainage volume) can be displayed. All functions will be maintained during transport of the patient. First clinical experiences using this device for ventricular and lumbar drainage will be reported.