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7.
When the adjustment is complete (approximately 3 seconds), the program unit emits one long beep and the
display changes to:
ADJUSTMENT COMPLETE
The valve setting can be confirmed visually or by x-ray. See Appendix A.
8.
After you press any key, the display changes to the original message:
9.
At the end of the adjustment session, turn off the power switch of the program unit and unplug the power cord
from the power source.
Valve Adjustment: Implanted Valve Mode
1.
Follow Setting Up the VPV System to set up the equipment and turn on the power.
2.
To select the implanted valve mode, press the mode selection until the LED beneath the implanted valve mode
icon illuminates. The program unit beeps and the LCD panel displays the following message:
3.
Press the appropriate setting selection key on the front panel. The program unit beeps; the corresponding LED
illuminates and the lamps on the transmitter illuminate. At the same time, the display changes to:
TRANSMITTER HEAD
4.
Palpate the scalp to locate the shunt system and the implanted valve. Gently palpate the valve to locate the hard
inlet valve portion, approximately 10 mm long (see Figure 5 for valve schematics). A fluoroscopic screen can assist
in this process.
Note: It is not necessary to shave the scalp for this procedure.
5.
Part any hair with the fingers. Apply a pea-sized amount of ultrasound gel, approximately 2 mm thick, to the
patient's scalp directly over the valve inlet portion. When the center rod of the transmitter compresses the gel, the
gel's diameter should be equal to or slightly larger than the diameter of the center rod. This will result in an air-
free connection between the scalp and the center rod of the transmitter.
Alternate method: apply ultrasound gel to the entire bottom surface of the center rod to a thickness of
approximately 2 mm.
CAUTION: Avoid contact between the gel and the feet of the transmitter. This can distort the acoustic signal and
cause a "REPEAT ADJUSTMENT" message to be displayed.
6.
Before placing the transmitter on the scalp, ensure that the arrow on the transmitter housing is in line with the
direction of fluid flow through the shunt (Figure 6).
PRESS A KEY
PACKAGED VALVE
PLEASE SELECT
PRESSURE
IMPLANTED VALVE
PLEASE SELECT
PRESSURE
IMPLANTED VALVE
POSITION
PRESS START
7.
Place the transmitter on the scalp so the center rod is in the center of the ultrasound gel (directly over the hard
inlet portion of the valve) and the transmitter's feet contact the patient's scalp. The center rod may recede slightly
and the gel will compress.
CAUTION: Hold the transmitter in place until Step 10 is complete. Movement can interfere with the acoustic
monitoring process.
CAUTION: Eliminate or minimize ambient noise, such as talking, during the adjustment process. Excessive noise
can interfere with the acoustic monitoring process.
8.
Press the transmitter's start button. The program unit beeps once and the LCD display changes to:
9.
During the adjustment, the setting selection keys light sequentially and the program unit emits a series of clicks
until the selected setting command has been issued to the valve.
10.
When the adjustment is complete (approximately 3 seconds), the program unit emits one long beep and the
display changes to:
Note: If the acoustic monitoring feature did not receive an expected response, the program unit will emit three
beeps and one of the two screens below will be displayed. Refer to Troubleshooting and follow the instructions for
completing the adjustment.
CAUTION: When adjusting an implanted valve, x-ray confirmation is required if an "Adjustment Complete"
message is not displayed. See Appendix A.
11.
After the "ADJUSTMENT COMPLETE" message is displayed and you press any key, the LCD panel changes to the
original message:
12.
Turn off the power switch of the program unit and unplug the power cord from the power source.
5
ADJUSTING VALVE
PLEASE WAIT
ADJUSTMENT COMPLETE
PRESS A KEY
REPEAT ADJUSTMENT
PRESS A KEY
– OR –
NO SIGNAL
REPEAT ADJUSTMENT
PRESS A KEY
IMPLANTED VALVE
PLEASE SELECT
PRESSURE
EN – ENGLISH
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