Polaris® valve introduction
The adjustable Polaris® valve is a major breakthrough for the safety of patients thanks to the patented self-locking system of the rotor.
This magnetic lock has been designed to resist unintentional operating pressure changes due to knocks or exposure to magnetic fields, especially during MRI examinations.
It offers the patient an unequalled security against the clinical risks associated with those dysadjustments.
The Polaris® Magnetic Lock is based on the permanent reciprocal attraction of two mobile micro-magnets of opposite polarity.
This “magnetic lock" holds the rotor in the selected position, thus preventing any accidental change in operating pressure if the valve is exposed
to magnetic fields.
In fact, in the presence of a standard magnetic field (unidirectional) the two micro-magnets are attracted in the same direction.
So only one of the two magnets moves in the direction of the field, while the other remains locked.
Changing the operating pressure of the valve first requires the simultaneous unlocking of the two micro-magnets in the valve by a specific magnetic key. The rotor can then turn freely on its central axis.
Valve subjected to a knock or to a magnetic field
with specific magnetic key
Direct pressure reading is obtained using the Adjustment Kit Compass: the Compass needle is aligned with the position of the magnetic rotor.
In addition to the standard model (30-200 mmH
2O), Polaris® also offers a
unique special pressure range
one low pressure valve and two high pressure valves. Thus a choice is provided, depending on the experience of the practitioner, to meet very specific clinical needs. (1,2)
The Polaris® valve can be associated with SiphonX®, an anti-siphon device, which adds 200mmH 2O in vertical position.
1 - Bergsneider, M., Miller, C. et al., 2008. Surgical Management of Adult Hydrocephalus - Neurosurgery - 62, 643-660.
2 - Takahashi, Y., 2001 - Withdrawal of shunt systems - clinical use of the programmable shunt system and its effect on hydrocephalus in children.Child's Nervous Syst. 17(8), 472-477.