Valve Test; Pressure-Flow Characteristics - MIETHKE proGAV 2.0 Instrucciones De Manejo

proGAV 2.0
Positioning the peritoneal catheter
The place of access site for the peritoneal
catheter is left to the surgeon's discretion. It
can be applied e. g. para-umbilically in a hori-
zontal direction or at the height of the epigas-
trium. Likewise, various surgical techniques
are available for positioning the peritoneal
catheter. We recommend pulling through the
peritoneal catheter, using a subcutaneous
tunneling tool and perhaps with an auxiliary
incision, from the shunt to the intended posi-
tion of the catheter. The peritoneal catheter,
which is usually securely attached to the pro-
GAV 2.0, has an open distal end, but no wall
slits. Following the exposure of, and the entry
into, the peritoneum by means of a trocar, the
peritoneal catheter (shortened, if necessary)
is pushed forward into the open space in the
abdominal cavity.

VALVE TEST

Preoperative valve test
The most careful way of filling the valve is by
aspiration through a sterile single-use syringe
attached to the distal end of the catheter.
The distal end of the valve is connected
and immersed in a sterile physiological saline
solution. The valve is patent if saline solution
can be extracted (Fig. 16).
WARNING
Contamination in the solution used for test-
ing can impair the product's performance.
Fig. 16: Patency test
WARNING
Pressurisation by the single-use syringe
should be avoided both at the proximal and
the distal end (Fig. 17).
INSTRUCTIONS FOR USE | GB
Fig. 17: Avoidance of pressurisation
Postoperative valve test
The proGAV 2.0 has been constructed as a
reliably functioning unit without pump or test
function. The valve test can be performed by
flushing, pressure measurement or pumping.

PRESSURE-FLOW CHARACTERISTICS

Horizontal valve position
The pressure flow characteristics of the
adjustable differential pressure unit in the
proGAV 2.0 are shown as an example for pres-
sure levels 0, 10 and 20 cmH
zontal valve position below.
Fig. 18: Pressure flow characteristics for selected
pressure levels of the adjustable differential pressure
unit
Vertical valve position
The opening pressure of the proGAV 2.0
in the vertical position is the sum of the
opening pressure of the adjustable DP-unit
and the gravitational unit. The following dia-
grams show the pressure-flow-characteristics
for some pressure settings in the vertical body
position. The total opening pressure refers to
a reference flow of 5 ml/h. When the flow
rates reach 20 ml/h, the opening pressures
are approximately 1-2 cmH
O in the hori-
2
O higher.
2
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