Stop Method; Adjusting Without The Locator - Sophysa SOPHY SAK Notice D'utilisation

10.1. Stop method

The correct orientation of the Locator in relation to the
valve's flow path is essential for an accurate reading of the
Compass.
Under thick skin, the connectors are sometimes difficult to
locate, which makes it difficult to accurately determine the
optimum orientation of the Locator.
In this case:
– If the current pressure of the valve is known (up to date
Patient Identification Card or recent X-ray), the orientation
of the Locator can be corrected with the Compass during
the reading, by turning the Locator-Compass assembly
slightly so as to align the Compass needle on the known
pressure of the valve.
– If the current pressure is not known with certainty, only the
stop method described below will ensure correct reading.
This entails adjusting the valve to one of its end positions
(or stops). This makes it possible to correct the orientation
during the reinsertion of the Compass.
NOTE
The maximum position is usually selected as the stop
so as to favor the reduction of drainage during han-
dling.
Stop method
Follow the steps described below to ensure the Locator cor-
rect orientation:
1. Without moving the Locator:
a. remove the Compass,
b. align the mark on the Magnet on the pressure read
and insert the Magnet vertically in the Locator.
2. Turn the Magnet until it reaches the extreme position se-
lected.
3. Then move two positions past stop.
4. Remove the Magnet vertically to ensure effective re-
locking of the valve rotor in the selected position.
5. Place the Magnet more than 50 cm from the valve.
6. Insert the Compass fully into the Locator.
If the valve is now set on the stop, the Compass needle indi-
cates the direction corresponding to the extreme position se-
lected.
If this correctly matches the indication of the Locator, it is
correctly oriented and the initial reading was correct.
Otherwise, as described below, it is possible to correct the
Locator orientation and to determine what the real initial
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pressure actually was before correction, based on the model
of the implanted valve.
On the Locator, count the number of positions between the
previously selected stop and the position showed by the
Compass.
– If the needle is to the left of the desired stop, add this
number of positions to the position originally read.
– If the needle is to the right of the desired stop, subtract
this number of positions to the position originally read.
Example
In this example, the needle is offset by one position to the
right (in the reading direction) from the desired stop. There-
fore, you need to subtract one position to the initial reading
to know the real initial setting.
If a correction is necessary, follow the instructions below:
1. Turn the Locator-Compass assembly until the needle is
perfectly aligned with the extreme pressure value selec-
ted.
2. If necessary, recenter the shaft of the Compass needle
in the target.
From this point forward, the Locator is perfectly positioned in
relation to the valve, which makes final adjustment possible.

10.2. Adjusting without the Locator

In case of an implantation deeper than recommended, the
standard procedure may be performed without the Locator
when adjusting a new pressure. The Magnet is thus closer to
the valve.
NOTE
This technique without the Locator concerns pressure
adjustment only. Pressure levels must be read and con-
firmed in accordance with standard procedure and/or
by X-ray examination.
1. Follow the usual procedure to position the Locator using
the Compass.
2. Draw two marks on the skin with a marker:
– one indicating the axis corresponding to the current
pressure of the valve, indicated by Compass needle,
– the other indicating the axis corresponding to desired
pressure, known with the Locator.
3. Remove the Locator-Compass assembly and place the
Magnet in the same place, directly on the implantation
site, oriented in the direction corresponding to the cur-
rent pressure, located in the previous step.