Porter Silhouette-LG, User Instructions

Page: 6 / 9

5
Basic Operation of Vacuum Control using
Silhouette Circuit: Setting Flow
For the Porter AVS or Vacuum Control Block
(Note: Use one or the other, not both):
1. AVS will automatically open upon the delivery of
1.5 to 3.5 L/min of gas flow. The Vacuum Control
Block is manually operated and must be opened
by
pushing “on/off” toggle to “on” position.
2. Adjusting vacuum flow using vacuum control
knob position:
Highest scavenging flow: For
AVS knob is horizontal; for 5501-RK knob is
vertical. To lower flow, rotate knob up to 45° from
full open position.
3. Use vacuum control knob and acrylic sight glass
on side of AVS or Vacuum Control block.
Vacuum flow with ball float within the green bar
area is effective; ball high within (or even above)
green bar is for highest vacuum flows.
4. Adjusting vacuum flow with Silhouette Circuit
attached:
Temporarily remove luer lock cap on
union of Disposable Section and adjust using
control knobs.
5. Start 5501-RK knob in vertical position (highest
flow) and adjust flow down. Ball float position
indicates higher and lower relative flows (exact
position of ball dependent on strength of vacuum
pump). Start AVS knob in horizontal position
(highest flow).
6.
Best “clock face positions”
for the control
knobs are listed in table on right. Set knobs at the
designated clock face position ranges for best
scavenging vacuum flow. Ball float may be above
the green bar if vacuum pump vacuum is strong
(high vacuum inches Mercury).
7. Remember to replace the luer cap again after
adjustment.
8. Monitor the vacuum conditions during the
procedure by observing the sight glass; Note:
vacuum is indicated with Silhouette Circuit
attached and ball “pegged high” in sight glass.
Ball float at bottom indicates no vacuum flow.
Repeat steps 2 through 7 to adjust vacuum flow
as necessary.
9. Note: Adjust vacuum flow with Matrx vacuum
control block with Silhouette Circuit attached.
Set to 5 minimum.
10. Note: Silhouette Circuit attached for other brand
vacuum control blocks; set middle to high end
settings.
11. Follow good work practices as recommended by
NIOSH.
11.1.Caution the patient not to talk unnecessarily
or breathe through the mouth.
11.2.The Silhouette Circuit Mask must be fitted
properly to avoid leaks. (Pedo mask for
children.)
11.3. 100% Oxygen should be administered
while the mask is being placed. Flowing
Nitrous Oxide while fitting the mask will
significantly increase N
2
O ppm (parts per
million) exposures.
11.4. All Silhouette Masks feature 4 holes in the
front of the mask for supplementary air
intake (also available, at lower delivery flow
rates, through inhalation opening the EAI
valve of a Bag Tee).
11.5.Flow only the volume of gas required by the
patient. Excessive gas flow could increase
N
2
O ppm exposures.
11.6.100% Oxygen should be administered for
several minutes at the end of the procedure.
This will flush the Nitrous Oxide from the
patient. Failure to follow this procedure will
result in higher N
2
O ppm exposure in the
operatory.
Set knobs at the designated clock face position
ranges for best scavenging vacuum flow
5501-RK AVS
Highest Flow Knob Vertical Knob
Horizontal
Best Flow
Range
11 o’clock to
1 o’clock 8 o’clock to
10 o’clock