Codman CERTAS Plus Manual Del Usario página 39

use the Adjustable Height Locator Tool. Optimal
placement is achieved when the selected Locator
Tool is stable on the patient's head and the tissue that
covers the valve mechanism is just below the cut-out
in the Locator Tool (Figures 9A and 9C).
4. Place the appropriate Locator Tool atop the
implanted valve so that the black lines are aligned
with the marked center of the hard valve mechanism
and the direction of flow arrow aligns with the
catheter barb marks (Figure 10).
Note: If using the Adjustable Height Locator Tool,
rotate the white outer ring to adjust the height until
the tissue that covers the valve mechanism is just
below the cut-out in the Locator Tool (Figure 9C) to
optimize the tool performance.
Note: If using the Low Profile Locator Tool, ensure
that the tissue that covers the valve mechanism does
not protrude through the cut-out in the Locator Tool.
If tissue is protruding through the opening, gently
hold the tool against the head to see if the tissue
stays below the cut-out. If there is too much tissue
protrusion, use the Adjustable Height Locator
Tool instead.
CAUTION: Failure to accurately position the
Locator Tool could result in an inaccurate
indication of the performance setting, potentially
leading to a false reading (i.e. an incorrect number
may appear in the window of the Indicator Tool).
The Locator Tool must be precisely aligned
with both the valve's direction of flow and the
center of the hard valve mechanism for an
accurate indication reading. Alignment can be
more challenging if tissue thickness is >10 mm
above the valve. In these instances, verify the
valve setting with x-ray or fluoroscopy. Refer to
SECTION D: Troubleshooting and SECTION E:
Confirming the Current Valve Setting.
5. Fully seat the Indicator Tool into the Locator Tool
so that the red markings are aligned (Figure 11). You
may hear a click when the tool seats. The indicator
tool will not rotate within the locator tool when
properly seated.
CAUTION: When reading the performance setting
with the Indicator Tool, make sure that the
Adjustment Tool and any other magnetic devices
are at least 36 cm (14 in.) away from the Indicator
Tool. Failure to do so can result in an inaccurate
indication of the performance setting.
6. When the number dial on the Indicator Tool stops
moving, observe the number and its position within
the window to determine the performance setting.
A single number within the window that has the full
purple background and both gray side lines visible
(Figure 13) indicates the performance setting of the
valve when the tools are properly aligned. Once the
valve performance setting has been read, remove the
Indicator Tool.
Note: If a single number with the purple background
and both gray side lines are not fully visible, then
the Locator Tool is not accurately aligned with the
valve. Remove the Indicator Tool and reposition
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