Indication; Technical Description Of The Valve - MIETHKE proGAV Instrucciones De Manejo

proGAV

INDICATION

The Miethke proGAV is intended to shunt cere-
brospinal fl uid (CSF) from the lateral ventricles
of the brain into the peritoneum.

TECHNICAL DESCRIPTION OF THE VALVE

The proGAV is a posture dependent hydro-
cephalus valve. It comprises a ball-cone valve
with adjustable opening pressure (adjustable
DP-unit) and a fi xed pressure gravitational unit.
In this way, optimal CSF drainage is ensured for
each individual patient in any body position.
Fig. 1: The proGAV is a combination of an adjustable Fig. 1: The proGAV is a combination of an adjustable
DP-unit and a gravitational unit.
adjustable differential pressure unit
(adjustable DP-unit)
gravitational unit
Fig. 2: Schematic cross section of the proGAV
The function of both valve units is described as
follows. Fig. 2 shows a schematic cross section
of the proGAV:
The adjustable DP-unit is composed of a solid
titanium body with a well-tried ball-cone valve
(1) integrated in its proximal part. A bow spring
(2) defi nes the opening pressure of the ball-
cone valve. The pretensioning of the spring,
and thus the valve opening pressure, can be
adjusted by turning a rotor (3), with the valve
implanted under the patient's skin.
The gravitational unit contains a tantalum ball
(4), which defi nes the opening pressure of this
valve, and a sapphire ball (5), which ensures the
precise closure of the valve. A connector under
the silicone catheter (6) always allows a later
disconnection of the catheter if necessary.
4
5
INSTRUCTIONS FOR USE |
6
6
1 sapphire ball
2 bow spring
3 rotor
4 tantalum ball
5 sapphire ball
6 connector under the silicone catheter
GB
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2
3
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