miethke proGAV 2.0 Gebrauchsanweisung Seite 21

proGAV 2.0
3. Adjusting the opening pressure
The proGAV 2.0 Adjustment Tool must be
positioned centrally on the valve. For a cor-
rect placement the valve should be palpated
with the forefinger through the opening in the
middle of the instrument. The desired pres-
sure setting must point on the scale in direc-
tion of the inlet connector and the ventricular
catheter. By applying light pressure the rotor-
brake will be released and the pressure of the
proGAV 2.0 can be changed.
Fig. 11: a) and b) Adjustment with the
proGAV 2.0 Adjustment Tool
The proGAV 2.0 is equipped with a feed-
back mechanism. When using the proGAV 2.0
Adjustment Tool, pressure on the housing of
the valve is created and a resulting acoustic
signal (a clicking sound) is produced due to
the unique construction of the valve housing.
This clicking sound indicates that the rotor-
brake is released. Now the rotor can rotate
freely. Once the pressure on the valve is
released, a clicking sound is heard and the
rotorbrake is again locked safely so that the
valve is safe against spontaneous re-adjust-
INSTRUCTIONS FOR USE | GB
ments. The clicking sound is well recognizable
before implantation. However after implanta-
tion, once the valve is filled up, depending on
place and texture of the surrounding area of
the implant, the acoustic signal could be con-
siderably muted. The clicking sound should
generally be audible by the patient itself or via
a stethoscope.
CAUTION
The new opening pressure setting of the
valve must not differ from the measured
opening pressure by more than 8 cmH 2 O in
any one setting.
Example: Opening pressure is to be changed
from 3 to 18 cmH
2
ment procedure the rotor would turn in the
wrong direction (short way) and would stop at
the position 0 cmH
2
adjustment is in 2 steps: Adjustment from 3
to 11 cmH O, and from 11 to 18 cmH
2
rotor turns correctly (fig. 12b).
Fig. 12: Rotor rotation during adjustment
a) false b) correct
CAUTION
From proGAV 2.0 Adjustment Tool a magnetic
field emanates. Metallic objects and mag-
netic media storages should have a sufficient
safety margin.
4. Verifying the adjustment
After adjusting the valve by using the proGAV
2.0 Adjustment Tool, it must be verified using
the proGAV 2.0 Compass as described in step
2. If the measured pressure now differs from
the intended pressure level, the adjustment
procedure has to be repeated from step 3.
Due to postoperative swelling of the skin the
adjustment of the valve setting may be difficult
within the first few days.
O. With only one adjust-
O (fig. 12a). The correct
O. The
2
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