Magnetic Lock; Principle Of The Polaris Valve Adjustment; Locating Instrument; Reading Instrument - Sophysa POLARIS SPV-SX Notice D'emploi

Table of Operating Pressures for Polaris
References SPV-140
concerned SPVA-140
Identification
0 point
of the range
1 10
2 40
Available
pressures 3 80
(mmH O)
2
4 110
5 140

3.3. MAGNETIC LOCK

The rotor of the Polaris
magnetic locking system.
This self-locking system is based on the permanent
reciprocal attraction of 2 mobile micro-magnets of
opposite polarity [12]
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 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 magnet.
Once unlocked, the rotor can then turn freely on its central
axis.
4. Principle of the Polaris
adjustment
For more information, refer to the instruction for use of the
Adjustment Kit.
The operating pressure of a valve can be adjusted in order
to adapt to the clinical evolution of the patient.
Changing the operating pressure of the Polaris
performed percutaneously using an adjustment kit made
up of 3 parts:
— Locating Instrument (Locator)
— Reading Instrument (Compass)
— Setting Instrument (Magnet)
The components of the Polaris
packaged, non-sterile, in a re-usable box.
®
The Polaris adjustment kit is not made with natural or
synthetic latex.
®
The Polaris adjustment kit is designed specifically for
®
setting Polaris adjustable valve pressures.
®
valves
SPV,
SPV-2010
SPVA, SPV-300 SPV-400
SPVA-2010 SPVA-300 SPVA-400
SPVB,
SPVB-2010
1 point 2 points 3 points
30 50 80
70 100 150
110 150 230
150 220 330
200 300 400
®
valve includes a patented
®
Valve
®
®
adjustment kit are

4.1. LOCATING INSTRUMENT

The Locating Instrument (Locator) is used to locate the
valve under the skin, an essential step in reading and
adjusting the operating pressure.
The Locator houses the Reading Instrument and the
Adjustment Instrument in turn.
It enables Polaris
pressure range (cf. Table of Operating Pressure Ranges).
WARNINGS
Do not use a Polaris
identifying the valve model and making sure that the
pressure range shown on the Locator corresponds to this
model.
Over-drainage or under-drainage can result from taking a
reading and/or making an adjustment with a different
pressure range on the Locator from that of the implanted
valve model.
To adjust a valve the Locator must display the pressure
range for the valve model to be adjusted. The Locator must
be perfectly positioned above the implant.
The green arrow shows the direction of flow of the CSF,
and makes it possible to position the Locator correctly in
relation to the valve.
The Locator center cut-out area in the shape of an imprint
of the valve is used to position the Locator as close as
possible to the implant.

4.2. READING INSTRUMENT

The Reading Instrument (Compass) fits into the Locator
and enables a reliable, accurate direct reading of the
operating pressure value for the valve.
PRECAUTION
When reading the pressure setting, make sure that the
Magnet or any other ferromagnetic object is not within a
distance of less than 0.5 m around the Compass so that
this reading cannot be falsified by the influence of magnetic
fields.
The Compass shows the position of the valve rotor. This
corresponds to the operating pressure that has been read.
The operating pressure reading is determined by the
alignment of the Compass needle with one of the lines
on the contour of the Compass and the corresponding
valve is
pressure value in the reading area of the Locator.

4.3. SETTING INSTRUMENT

The Setting Instrument (Magnet) is made up of a specific
assembly of magnets designed to allow the adjustment of
the operating pressure for the Polaris
PRECAUTION
Changing the valve pressure must only be done by a
neurosurgeon, or other qualified person.
The Magnet is inserted into the Locator.
The insertion of the Magnet into the Locator makes it
possible:
®
valves to be adjusted whatever their
®
adjustment kit without previously
®
valve.
ENGLISH – 7