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What is
Hydrocephalus
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About Diamond
| Theory of operations | Performance
| Diamond Range | Setup
Instructions
Diamond
II : DCV220A
| DCS202A | DCV225A
| DCS225A |
DCS225APL | DCS225ASL
| DCS225PS | DCS225SS
Diamond
I : DCV120 | DCS102
| DCV125 | DCS125
| No
Metal parts |
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VALVES
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At low pressure, normal flow of CSF flows from the ventricular
catheter through the inlet (1) into the pumping chamber (2) around
the high pressure valve (3) and through the diamond shaped aperture
in the side wall of the flow control tube (6), which is normally
open. Flow continues through the very low-pressure check valve (5)
and out through the outlet port (7) to the distal shunt tubing.
This feature permits CSF flow at very low pressure (Figure 1)
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| As positive proximal or negative distal
pressure increases, the flow control tube (4) contracts and the aperture
(6) begins to close. As the aperture begins to close, fluid flow is
restricted and resistance of the valve begins to increase. The flow
rate is controlled within physiologic limits throughout the mid-range
of physiologic pressures. (Figure 2) |
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| At a predetermined pressure, the high-pressure
relief valve (3) begins to open, permitting increased flow through
the tube (4) and the outlet (7). The aperture (6) and the high-pressure
valve (3) automatically work together to regulate the pressure and
flow conditions through the valve, regardless of the patient position
or condition. This feature acts as a safety mechanism to prevent under
drainage and periods of prolonged intraventricular hypertension. (Figure
3) |
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The valve mechanism consists of a silicone elastomer dome with
two crossed slits. This design provides progressive resistance to
flow which resists overdrainage due to the gravitional effect of
the hydroststic column created between the proximal inlet and the
distal outlet of the shunt system, when a shunted patient stands.
The SaFR mechanism consists of a pressure sensitive elastic tube
with an aperture in the side wall which close in proportion to the
positive proximal or negative distal pressure acting upon it. This
unique mechanism regulates ICP and the flow of CSF within physiologic
limits, regardless of patient position. Phoenix Diamond Valve is
available in two performances ranges.
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catalog revision date 7/03
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