Aspiration
1. IMPORTANT ASPIRATION PRETEST
It is recommended that an aspiration pretest be performed prior to any
injection requiring aspiration. This simple pretest will confirm that the
disposable handpiece, anesthetic cartridge and attached needle are free
from air leaks which might compromise aspiration efficiency.
Once the drive unit purge cycle is completed, orient the needle
horizontally with the bevel down or to the side. Pretest will not work if
needle bevel is in the up position.
Express anesthetic extra-orally at the ControlFlo™ rate (slow speed).
Release the foot control and observe the drop of anesthetic at the end of
the needle. If a drop is retracted and returns to the needle tip at the end of
the aspiration cycle, in about 5 seconds, aspiration is functioning properly.
If droplet does not retract, do the following in the order listed:
i. Re-tighten needle hub and retest
ii. Replace cartridge and retest
iii. Replace the STA Wand™ handpiece and retest
iv. Lubricate O-Ring and retest
v. Replace O-Ring and retest
This test should be repeated with each new anesthetic cartridge when
aspiration is to be used. Rubber stopper movement in the cartridge can
also be monitored during aspiration as a further assurance.
2. Aspiration “On/Off” feature: Aspiration can be performed automatically
when the Aspiration feature is set to the “On” position (indicated by the
green LED light on the front panel). When this feature is set to the “On”
aspiration state, aspiration can be performed in all three modes (STA,
Normal & Turbo). To change the setting before or during a procedure,
press the “Aspirate” button on the front of the control panel.
3. TO ASPIRATE: Be sure aspiration mode is activated (light on). Aspiration
is initiated by lifting your foot from the foot control in STA, Normal or Turbo
mode. When the aspiration function occurs, the plunger is retracted a
preset distance, then automatically returns to its original position. Positive
aspiration will show blood in the needle hub and/or tubing contained in the
handpiece.
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