Irrigation
Introduction
CUSA EXcel Ultrasonic Surgical Aspirator System Service Manual 2-3
Irrigation
Sterile irrigation fluid flows from an I.V. set (bottle or bag and I.V. administration
tubing) to a variable speed peristaltic pump:
• The pump moves fluid at 1 to 10 cc/min; default flow is 3 cc/min. Adjustment
buttons (blue up/down arrows on black buttons at the bottom of the irrigation
display column on the control panel) allow you to increase or decrease the
irrigation flow.
• The pump can also accelerate to a Fast Flush speed, pumping at 25 to 30 cc/
min. The Fast Flush pedal on the CUSA EXcel system footswitch activates
the Fast Flush feature.
The pump pushes the fluid through the manifold irrigation tubing to a flue, a
sleeve surrounding the vibrating tip. As the irrigation fluid passes through the
flue, it cools the tip.
When the fluid reaches the distal end of the tip, as much as 99% of it passes
through two pre-aspiration holes in the tip, eliminating fluid pooling on the sterile
field and continually clearing the suction system. The fluid that does not pass
through the pre-aspiration holes irrigates the surgical site and suspends
fragmented tissue.
Figure 2-1.
The pre-aspiration holes and threads
on tips
Threads
Pre-aspiration Hole (2)
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