Plunger Operation
When the STA System is first turned on, the plunger retracts and parks in the
retracted position. Inserting the cartridge automatically engages the plunger and
purges the tubing. The system is ready when the indicator is illuminated,
showing a FULL volume.
As the plunger is extended dispensing anesthetic, the volume indicator light will
show the amount of anesthetic solution remaining in the cartridge. As the
plunger is fully extended, an audible warning beep is sounded. This indicates
that the cartridge is empty. When the cartridge is fully emptied or when the
cartridge holder is removed, the plunger will automatically retract into the drive
unit. If the Auto-Purge/Retract is not set, the plunger can be retracted by
pressing the Hold to Retract button.
Plunger Retraction
Retraction of the plunger can be performed using any of the following three
methods:
1. When the “Auto-Purge/Retract” feature is activated (noted by the illuminated
green LED on the front panel) the plunger will automatically retract when the
cartridge holder is removed from atop of the STA drive unit.
2. Manual retraction of the plunger. When the “Auto-Purge/Retract” feature is
not activated it is necessary to manually retract the plunger during use. This
is accomplished by depressing the multipurpose “Hold to Retract” button for
greater than 4 seconds.
3. Retraction of the plunger to the return “home” position will occur after the
plunger has fully expressed the content of an anesthetic cartridge. (This will
occur irrespective of the “AutoPurge/Retract” feature state and does not
require the removal of the cartridge holder from the STA drive unit.)
NOTE: To turn the “Auto-Purge/Retract” feature “On” and “Off” use the
multipurpose “Hold to Retract” button. You may toggle it “On/Off” by depressing
and releasing the button for less then 4 seconds.
Removal of Cartridge
Ensure plunger is fully retracted. Remove the cartridge
holder from the cartridge socket drive unit by rotating
cartridge holder clockwise 1/4 turn. Remove used cartridge
by pushing with finger placed into slots in side of holder. If
continuing injection procedure, remove and discard the
used cartridge and insert a new full cartridge into the
cartridge holder and continue.
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