Valve Test; Pressure-Flow-Characteristics - MIETHKE proGAV 2.0 Mode D'emploi

GB | INSTRUCTIONS FOR USE
pulling through the peritoneal catheter, using
a subcutaneous tunneling tool and perhaps
with an auxiliary incision, from the shunt to
the intended position of the catheter. The
peritoneal catheter, which is usually securely
attached to the proGAV 2.0, has an open dis-
tal end, but no wall slits. Following the expo-
sure 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. 15).
CAUTION
Contamination in the solution used for test-
ing can impair the product's performance.
Fig. 15: Patency test
WARNING
Pressurisation by the single-use syringe
should be avoided both at the proximal and
the distal end (fig. 16).
Fig. 16: 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.
22

PRESSURE-FLOW-CHARACTERISTICS

Horizontal valve position
The pressure flow characteristics of the
adjustable differential pressure unit in the pro-
GAV 2.0 are shown as an example for pres-
sure levels 0, 10 and 20 cmH
zontal valve position below.
Fig. 17: 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
proGAV 2.0
O in the hori-
2
O higher.
2