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Aisys CS²
ecoFLOW theory of operation
Ventilation modes
11-24
The voltage from the cell cartridge is affected by the temperature of
the monitored gas mixture. A thermistor in the cell's housing
automatically compensates for temperature changes in the cell.
O2 monitoring uses signal processing and analyzing circuitry to
convert the cell signal into a corresponding percent oxygen value.
The system displays this value and compares it to saved alarm
limits. If the value falls outside the limits, the monitor produces the
appropriate alarms.
The ecoFLOW option provides a split screen view that shows the
approximate minimum O2 flow to maintain a preset FiO2 value. It
also shows the approximate agent used per hour and the cost. Some
information associated with the ecoFLOW option is not provided
when the airway module is warming up, not present, or non-
functional.
The split screen shows the Paw gauge in the upper area and the
ecoFLOW gauge in the lower portion of the screen. The ecoFLOW
gauge consists of a fresh gas flow tube, an agent flow indicator, and
related parameters.
The fresh gas flow tube is a stacked flow tube showing the total O2
flow on the bottom and the remaining gas (N2 or N2O) on top. These
gases determine the total fresh gas flow setting. Below the fresh gas
flow tube is the measured total O2 flow to the patient and the
calculated FiO2 flow value. The FiO2 flow value is based on the
FiO2 Setting specified in Super User mode. This is the minimum O2
flow needed to deliver a preset inspired O2 concentration. The FiO2
flow value is specific to each patient and case. It is calculated using
the fresh gas settings, the patient O2 uptake, the dilution effect of
agent being delivered, and the effects of the circle breathing system.
The agent flow indicator shows the amount of liquid agent flow as
related to the fresh gas setting. The calculated cost of the agent
shows above this indicator. This cost is based on agent flow and the
values entered in the Agent Costs menu set in Super User mode.
The system has the following standard mode of mechanical
ventilation:
•
Volume control ventilation (VCV)
The system offers the following optional modes of mechanical
ventilation:
•
Pressure control ventilation (PCV)
•
Pressure control ventilation - volume guaranteed (PCV-VG)
2067226-001
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