MIETHKE proGAV 2.0 Mode D'emploi page 20

GB | INSTRUCTIONS FOR USE
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. 12: 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.
18
Once the pressure on the valve is released,
a clicking sound is heard and the rotor-
brake is again locked safely so that the
valve is safe against spontaneous re-adjust-
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.
WARNING
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 (see chapter 4 "Verifying the
adjustment").
Example: Opening pressure is to be changed
from 3 to 18 cmH O. With only one adjustment
2
procedure the rotor would turn in the wrong
direction (short way) and would stop at the
position 0 cmH O. The correct adjustment is
2
in 2 steps: Adjustment from 3 to 11, and from
11 to 18 cmH O. The rotor turns correctly.
2
Fig. 13: Rotor rotation during adjustment
a) false b) correct
WARNING
From proGAV 2.0 Adjustment Tool a magnetic
field emanates. Metallic objects and mag-
netic media storages should have a sufficient
safety margin.
proGAV 2.0