Johnson & Johnson Surgical Vision Veritas, Operator'S Manual

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Program Settings
Z370584 Rev. D FUSION Fluidics Phaco
6-33
Venting an Occlusion
As discussed earlier in this chapter, vacuum builds when the aspiration tip is blocked or
occluded by tissue or other material. The fluidics system relieves vacuum in the aspiration
line when the foot pedal traverses from position 2 to position 1.
The fluidics system applies variable venting pressure of Low, Medium, or High to the
aspiration line as selected in the surgeon settings to release the material at the aspiration tip
when the foot pedal is released to position 0. This methods releases the material at the
aspiration tip and gives you full control if the tip accidentally grabs the capsule or iris.
The fluidics system maintains the desired vacuum level when you hold the foot pedal at a
constant position. The two adjustments associated with aspiration flow are Max Vac and
Max Flow.
CASE Mode
CASE maintains a stable chamber by detecting an impending occlusion break, and reducing
the vacuum before occlusion surge can occur. When the system detects the occlusion, the
system waits long enough to allow you to grasp the particle firmly, and then reduces the
vacuum to a lower level that allows the occlusion to clear safely. When you clear the
occlusion, the vacuum returns to the previous vacuum level.
To access CASE settings:
1. Tap the Settings button.
2. On the Settings screen, tap the FUSION button ( ).