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Circle Anesthesia System
• Avoid recirculation of gases. Undesired recirculation of gases will occur if fresh
WARNING:
gas flows are less than the patient minute volume and may result in:
- Higher NO
remove NO
- Higher NO concentrations than those set due to NO recirculated through the
absorber.
- Reduction in O
oxide and will be present in the re-circulated gases.
• Note the airflow direction arrow on the injector module: the flow out of the absorber must pass
Caution:
through the injector module in the direction of the arrow on the module.
• Nitrous Oxide (N
N
O, 50% O
2
same Set NO value at 100% O
will be approximately 18 ppm.
• Similarly, the effect of two percent v/v Isoflurane will result in a high measured NO value of
approximately three percent indicated for the same Set NO value at 100% O
• Sudden changes in anesthetic agent concentration may cause brief transient changes in the
measured NO and NO
• With a circle anesthesia breathing circuit, the INOmax DS
Note:
technical specifications with fresh gas flow rates equal to or more than the patient minute volume.
• The breathing circuit between the sample tee and the patient Y should be between six and 12
inches (150-300 mm) long: greater than six inches to minimize the sampling of mixed inspired/
expired concentrations and less than 12 inches to help ensure correct patient NO
• For OR ventilation systems with the inspiratory flow measurements at the inspiratory port of the
absorber, place the injector module upstream of the inspiratory flow sensor.
3-34
levels due to the limited ability of the carbon dioxide absorbent to
2
.
2
concentration because nitrogen is the balance gas for nitric
2
O) will also affect the Set NO versus the measured NO value. For a 50%
2
composition, the measured NO value will be approximately 7% less than the
2
. For example, at a Set NO value of 20 ppm, measured NO
2
values.
2
2
will perform as specified in the
IR
2
Part No. 20717 Rev-01
.
measurement.
2014-07
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