18
Indicated Flow Delivery Test:
Set the % OXYGEN display to 100%. Press the
[
]
flow key and hold, as shown in Figure 1. The
flow rate should decrease to 1.0 LPM. An audible
alarm sounds at the lower limit while the key is
held. Press the [
]
flow key and hold. The flow
rate should increase to 9.9 LPM. An audible alarm
will sound at the upper limit as long as the key is
held.
Indicated Percentage (%) Delivery Test:
Set the LPM FLOW display to 9.9 LPM. Press and
hold the [
] % OXYGEN key. The % OXYGEN
display should decrease to 30%. The audible
alarm sounds at the lower limit while the key is
held. Press and hold the [
] % OXYGEN key, as
shown in Figure 1. The % OXYGEN display
should increase to 100%. An audible alarm
sounds at the upper limit while the key is held.
Basic Delivery Technique:
Practice titration. Titration is a method of
administering a substance by adding definitive
amounts of a drug until an endpoint is reached.
For nitrous oxide / oxygen (N
2
O) / O
2
) sedation,
N
2
O is given in incremental doses until a patient
has reached a comfortable relaxed state of
sedation. The ability to titrate N
2
O is a significant
advantage because it limits the amount of drug to
that which is required by the patient. If titration is
done properly, the patient does not receive any
more of the drug than is necessary. The amount
of N
2
O required by a patient on any given day or
time varies.
For information on titration, a most valuable
resource for the practitioner is the Handbook of
Nitrous Oxide and Oxygen Sedation, written by
Clark and Brunswick and published by Mosby
(www.mosby.com). This text is a concise and
contemporary guide for nitrous oxide / oxygen
administration.
Maintenance
The DIGITAL MDM mixer is a precision analgesia
mixing unit. As with any medical instrument, it
requires periodic inspection and maintenance.
The following routine maintenance procedures
should be performed to ensure system integrity
and trouble-free service.
-Inspect mixer, hoses, and connections daily for
damage, wear, and leaks.
-Perform functional tests prior to each use. These
tests are described in Performance Checks,
-While cleaning the outside of the unit, observe
caution so that liquid does not get inside. Porter
recommends using a damp (wrung toward dry)
cloth moistened with a mild soap or a plastic-safe
cleaner. Do not spray directly on the case. A hard
surface disinfectant may be applied in the same
manner.
CAUTION: DO NOT submerge the
unit—use a damp cloth
.
WARNING: Before cleaning the unit,
disconnect the DIGITAL MDM mixer’s power
cord from the electrical power supply.
Fuse Replacement in Domestic, 115-120V
and International, 220-240V
1. To replace a blown fuse, turn the unit OFF,
disconnect power to the unit by unplugging
the power cord from the wall, and then
remove the power cord from the input
connector on the rear of the unit.
2. Open the fuse compartment, as shown in
Figure 11.
3. Remove each blown fuse from its clip and
replace it with a 5mm x 20mm cartridge fuse,
rated 2.5 amp, 250 volt, slo-blo (time delay),
part number 63882537. Two fuses are
required for the unit to operate.
Figure 11 Fuse Replacement
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