Siphonguard Device; Accessories; Catheters - Codman CERTAS Plus Manual Del Usario

The valves are designed for use with catheters having
the following dimensions:
Component
Ventricular catheter
Distal catheter

SIPHONGUARD Device

The SIPHONGUARD Device is supplied with some
models of the valve. CSF flows through the valve and
enters the SIPHONGUARD Device, where it flows into
two internal passages. Under normal conditions, the
majority of CSF flows through a central ruby ball and
cone valve, and exits directly out of the distal port of
the SIPHONGUARD Device. The remaining CSF travels
through a spiral passage that surrounds the central
passage, distal to the ball and cone valve.
A sudden increase in CSF flow will close the ball and
cone valve and the entire volume of CSF will be forced
through the longer spiral passage, effectively slowing
the rate at which CSF is shunted from the brain. Once
the flow rate entering the SIPHONGUARD Device
decreases, the ruby ball separates from the valve seat,
opening the central passage. As long as CSF continues
to be shunted from the ventricles, flow through the spiral
passage of the SIPHONGUARD Device never stops,
regardless of the patient's position. See Graphs 1 and 2
for pressure flow characteristics.
Note: The SIPHONGUARD Device will not activate at
low CSF flow rates.
The SIPHONGUARD Device has a rigid enclosing shell
of polyethersulfone to prevent inadvertent closure
(and subsequent reduction or blockage of CSF flow)
caused by externally applied pressure.

Accessories

Accessory components supplied with some models of
the valve include:
Ventricular catheter
Distal catheter (unitized or separate)
Right angle adapter
Priming adapter

Catheters

The ventricular catheter is a 14 cm straight ventricular
catheter molded of radiopaque silicone elastomer with
x-ray detectable dots and a preassembled stainless steel
introducing stylet.
The distal catheter is 120 cm long, molded of radiopaque
silicone elastomer with x-ray detectable dots.
The BACTISEAL Catheters that are supplied with
some models of the valve are made of radiopaque
barium-impregnated silicone tubing that is subjected
to a process by which the silicone is impregnated with
rifampin and clindamycin hydrochloride.
The quantities of rifampin and clindamycin hydrochloride
used to impregnate the catheters are only a small
fraction of a therapeutic dose of these two antibiotics,
and have no potential for systemic therapeutic effect.
BACTISEAL Catheters are also available separately.
Inner
Diameter
1.4 mm
1.0 mm
9
Outer
Diameter
2.7 mm
2.2 mm