6 Circle System
20 SA-103-0109V1.3-HAO-GB © F. Stephan GmbH
6.1.1 CL (closed)
The valve is completely closed. This setting is necessary for operation in
respirator mode. In this mode, the spent respiratory gases are evacuated
via the ejector on the patient component during the expiration phase.
6.1.2 Pressure Range from 5mbar to 50mbar
This setting is used to limit the maximum pressure during manual
ventilation. When the set pressure is reached, the valve evacuates.
6.1.3 Spontaneous Respiration
During spontaneous respiration of the patient under light anaesthesia, the
valve closes in the inspiration phase, the patient now breathes the fresh
gas provided by the apparatus. In the expiration phase, the valve opens
and evacuates the system until ambient pressure is reached.
This setting is to be used in case of assisted ventilation with the patient
triggering the respiration and the respirator deepening the respiration.
Aside of that, it is possible to switch to SP briefly in case of manual
ventilation in the pressure range of 5 to 50 mbar to evacuate an overfilled
respiratory bag.
6.1.4 VOL (volume-controlled ventilation)
With the valve setting VOL, the circle system is closed automatically to
guarantee supply of the patient with the desired respiratory working
volume. Spent and excess respiratory gases escape from the valve at the
end of the expiration phase. During the expiration phase, pressure in the
system never rises above 1,5 mbar.
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