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Description:
The valve assembly is comprised of two silicone elastometer slit
valve mechanisms in series separated by an integral pumping chamber
within a silicone elastometer chamber with an integral suture base.
Each valve mechanism consists of a silicone elastomer dome with
two crossed slits in polysulfone housing. Use of polysulfone eliminates
MRI artifact. CRx valves and Shunt Systems Contain no Metal Parts.
Both valve mechanisms open in response to predetermined differential
pressure and close when differential pressure has dropped below
a predetermined level.
The design of the valve mechanisms prevents retrograde flow to
the brain. The valve housings
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incorporate integral proximal and distal connectors for easy catheter
connection.
The mechanisms are separated by silicone reservoir which provides
a pumping chamber and is self-sealing when penetrated by a 25 gauge
or smaller Hueber-point needle or equivalent non-coring needle.
This permits removal of CSF samples, as well as injections of contrast
media, medication, or flushing fluid. The base of the valve is polyester
reinforced silicone elastomer for suturing of the valve in place.
Integral Hemmer™ sleeves extend over the connectors,protecting
catheter connections from ligature stress and disconnection.
The valve base and all catheters are radiopaque. The valve is marked
with a radiopaque flow direction arrow and dots for radiographic
identification of valve pressure.
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