Codman CERTAS Plus Manual Del Usario página 46

Note: An excessive flow rate (>0.75 mL/min)
activates the SIPHONGUARD Device and creates
the impression that the valve is distally occluded. In
reality, flow is being diverted to the high resistance
secondary pathway.
6. Once all air has been removed from the valve,
submerge the valve completely in the water bath. For
valves with a distal catheter, submerge the end of the
catheter in the water bath to obtain accurate results.
Confirm that there are no bubbles attached to the end
of the distal catheter and that the water bath does not
obstruct the end of the catheter.
7. Adjust the stopcock to connect the syringe to the
manometer (Figure A-6 above) and refill the manometer
to a height equal to the operating pressure of the next
highest setting above the valve setting being tested, or
to 60 cmH
for operating pressure specifications.
8. Turn the stopcock to connect the manometer to the
valve (Figure A-7 above).
9. The water column in the manometer will start to fall.
Allow the water column to drop for 2 minutes and
then read the resultant pressure.
Note: For valves with distal catheter and/or
SIPHONGUARD Device, an extended test time
is recommended in order to compensate for the
possibility of a decreased flow rate due to the
additional catheter resistance and/or SIPHONGUARD
Device activation. Allow the water column to drop for
4 minutes and then read the resultant pressure.
Test Results
The resultant closing pressure may be compared to the
table below.
Note: Variations in the manometer closing pressure test
result are possible based upon the test conditions and
the test method utilized.
Valve Setting
1
2
3
4
5
6
7
8
O if one is testing Setting 8. Refer to Table 1
2
Minimum Closing Pressure
(mmH
0 mmH
0 mmH
30 mmH
55 mmH
80 mmH
105 mmH
140 mmH
300 mmH
22
O)
2
O
2
O
2
O
2
O
2
O
2
O
2
O
2
O
2