Indication; Technical Description; Function Of The Valve - MIETHKE M.blue Mode D'emploi

EN | INSTRUCTIONS FOR USE
Fig. 1: Cross section of M.blue
1. Adjustable gravitational unit
2. Sapphire ball
3. Tantalum weight
4. Rotor

INDICATION

M.blue is used for cerebrospinal fluid (CSF)
drainage in the treatment of hydrocephalus.

TECHNICAL DESCRIPTION

M.blue is a valve made from titanium. It consists
of an adjustable gravitational unit and a differ-
ential pressure unit (fig. 1). The adjustable grav-
itational unit (1) in the proximal part of the valve
contains a tantalum weight (3), which holds a
sapphire ball in the ball seat via a lever (2).
Depending on the body position of the patient,
the influence of the tantalum weight on the sap-
phire ball and thus the valve opening pressure
changes. Via a rotor (4), the pretension of the
torsion spring connected to the lever can be
changed through the skin.
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5. Differential pressure unit
6. Sapphire ball
7. Micro-coil spring
This way, the influence of the tantalum weight
on the sapphire ball can be influenced and thus
the valve opening pressure can be adjusted. In
the distal part of the valve, a micro-coil spring (7)
controls the opening pressure of the differen-
tial pressure unit (5). A sapphire ball (6) ensures
precise opening and closing of the ball-cone
unit.

FUNCTION OF THE VALVE

M.blue is a posture-dependent hydrocephalus
valve. The opening pressure for M.blue con-
sists of the opening pressures for the adjustable
gravitational unit and the differential pressure
unit combined.
Horizontal position
In the horizontal position, the gravitational unit is
always open and does not offer any resistance.
M.blue
®