Integra CUSA Clarity Operator's Manual page 65

Assembling the Handpiece in the Sterile Field
7-6
4. Make sure that the flue is aligned with the pre-aspiration holes at the
distal end of the tip.
NOTE
If the pre-aspiration holes are completely covered, most of the irrigation
fluid may be aspirated back through the handpiece, impairing cavitation,
thus reducing tissue ablation efficacy.
CUSA Clarity Ultrasonic Surgical Aspirator System Operator's Manual
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