5.5 IRRIGATION ASPIRATION (I/A) MODE
The Irrigation and Aspiration Mode controls the irrigation pinch valve, venting pinch valve, and the
peristaltic pump located on the left side of the system where the cassette and tubing are
connected to the system. The Irrigation and Aspiration function is used to remove cortical material,
viscoelastic material, and any remaining lens material in the eye.
During Aspiration, Irrigation is required to prevent the collapse of the cornea; the aspirated
material is replaced with the irrigation solution. The source of irrigation is provided by an inverted
container of irrigation solution which is suspended above patient eye level in the operating room.
The amount of the irrigation solution delivered is controlled by the height of the container. A drip
chamber with connecting tubing is attached to the irrigation container and routed through the
irrigation pinch valve, venting pinch valve,
and peristaltic pump to the ultrasonic handpiece from
the tubing cassette. The height of the container is measured from the middle of the drip chamber
to the level of the patient’s eye.
Control of the irrigation pinch valve, venting pinch valve, and peristaltic pump is accomplished by
actuation of the foot pedal.
When the foot pedal is depressed to position (1), the irrigation pinch valve will open. No Aspiration
will occur within the first 25% of foot pedal travel. The remaining 75% of foot pedal travel will allow
control of Aspiration.
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