Reading The Pressure Setting From An X-Ray Image - MIETHKE proGAV 2.0 Instrucciones De Manejo

| INSTRUCTIONS FOR USE
GB
Vertical position
The proGAV 2.0 opening pressure for the verti-
cal body position is calculated from the sum of
the opening pressure of the adjustable differen-
tial pressure unit and the gravitational unit. Pa-
tient size, activity level and potentially increased
abdominal pressure (obesity) should be taken
into account in selecting the opening pressure
for this position (see pressure level recommen-
dations at https://www.miethke.com/en/pro-
ducts/downloads/).
READING THE PRESSURE SETTING
FROM AN X-RAY IMAGE
The set pressure level of the proGAV 2.0 should
always be checked using the proGAV 2.0 Com-
pass, but it can also be checked using an x-ray
image. The rotor setting is decisive in this case.
The four magnets in the rotor can be seen on
the x-ray image as white points and are loca-
ted opposite each other in pairs. Two additio-
nal burrholes (right and left next to the magnet
pairs) on one side of the rotor can be used as
orientation. They can be seen as black points
on the X-ray image. This side can be designa-
ted as the rotor rear side. The two front ma-
gnets are opposite. The space between these
two magnets can be considered as the triangle
apex. The pressure level can be read off using
the orientation of this intermediate space. The
triangle apex can take up any position except
the space labelled as a non-adjustable area in
fig. 5. This means that the opening pressure of
the proGAV 2.0 can be infinitely variably adju-
sted from 0 up to 20 cmH
pressure stage is not read off as a mirror image,
the valve is provided with a valve marking on
one side which is visible as black in the X-ray
image - on a plan view of the implanted valve
as in fig. 6 the recess on the right-hand side
is visible.
Admittance markings
4
2
0
Non-adjustable
range
20
18
Fig. 5: Schematic representation of rotor in X-ray image
18
O. To ensure that the
2
Valve marking
6
8
10
12
14
Triangle apex
16
Fig. 6: X-ray image of an adjustable differential
pressure unit, setting 14 cmH
The pressure levels can be identified by coding
in the X-ray image. The following pressure levels
are possible for the gravitational unit:
Opening Pressure
10 cmH O SA 2.0
2
15 cmH O SA 2.0
2
20 cmH O SA 2.0
2
25 cmH O SA 2.0
2
30 cmH O SA 2.0
2
35 cmH O SA 2.0
2
Fig. 7: SA 2.0 pressure levels encodings on X-ray
proGAV 2.0
O
2
Coding