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6 Specifications and Theory of Operation
Modes
The system has four modes of mechanical ventilation:
• Volume control mode
• Pressure control mode
• Synchronized intermittent volume (SIMV) mode (optional)
• Pressure support ventilation (PSVPro) mode (optional)
Use the main menu to set the mode.
Figure 6-4 • Ventilation Setup Menu
Volume control mode
Figure 6-5 • Volume control diagram
Volume Control supplies a set tidal volume. The ventilator calculates a flow
based on the set tidal volume and the length of the inspiratory time (T
) to
I
deliver that tidal volume. It then adjusts that output by measuring delivered
volumes at the inspiratory flow sensor. Since the ventilator adjusts output, it
can compensate for breathing system compliance, fresh gas flow, and
moderate breathing system leaks.
A typical volume controlled pressure waveform increases throughout the
entire inspiratory period, and rapidly decreases at the start of expiration. An
optional inspiratory pause is available to improve gas distribution.
Volume control
• V
(tidal volume)
T
mode settings
• Rate
• I:E
• Plimit
• PEEP
6-19
1009-0633-000
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