Indication; Technical Description; Function Of The Valve - MIETHKE M.blue Instrucciones De Manejo

GB | 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 differential pressure unit (fig. 1). The
adjustable gravitational 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 posi-
tion of the patient, the influence of the tanta-
lum weight on the sapphire ball and thus the
valve opening pressure changes. Via a rotor
(4), the pretension of the torsion spring con-
nected 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 differential 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
consists of the opening pressures for the
adjustable gravitational unit and the differen-
tial pressure unit combined.
Horizontal position
In the horizontal position, the gravitational unit
is always open and does not offer any resis-
tance.