Investigation of the hydrodynamic properties of a new MRI-resistant programmable hydrocephalus shunt.

Cerebrospinal Fluid Research
David M AllinZofia H Czosnyka

Abstract

The Polaris valve is a newly released hydrocephalus shunt that is designed to drain cerebrospinal fluid (CSF) from the brain ventricles or lumbar CSF space. The aim of this study was to bench test the properties of the Polaris shunt, independently of the manufacturer. The Polaris Valve is a ball-on-spring valve, which can be adjusted magnetically in vivo. A special mechanism is incorporated to prevent accidental re-adjustment by an external magnetic field. The performance and hydrodynamic properties of the valve were evaluated in the UK Shunt Evaluation Laboratory, Cambridge, UK. The three shunts tested showed good mechanical durability over the 3-month period of testing, and a stable hydrodynamic performance over 45 days. The pressure-flow performance curves, operating, opening and closing pressures were stable. The drainage rate of the shunt increased when a negative outlet pressure (siphoning) was applied. The hydrodynamic parameters fell within the limits specified by the manufacturer and changed according to the five programmed performance levels. Hydrodynamic resistance was dependant on operating pressure, changing from low values of 1.6 mmHg/ml/min at the lowest level to 11.2 mmHg/ml/min at the highest performance level....Continue Reading

References

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Jul 1, 2006·Cerebrospinal Fluid Research·David M AllinJohn D Pickard

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Citations

Nov 9, 2012·Child's Nervous System : ChNS : Official Journal of the International Society for Pediatric Neurosurgery·Ulrich-W ThomaleMatthias Schulz
May 30, 2013·Child's Nervous System : ChNS : Official Journal of the International Society for Pediatric Neurosurgery·Anna Felicitas GebertUlrich-Wilhelm Thomale
Dec 4, 2009·Acta neurochirurgica·Michel LefrancMichel Petitjean
Jan 23, 2016·Journal of Neurosurgery. Pediatrics·Anna-Felicitas GebertUlrich-Wilhelm Thomale
Feb 24, 2011·Physiological Measurement·Henrik OdéenBruce S Spottiswoode

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Polaris
Sophysa

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