5.6.1 VIT MODE FUNCTIONS
Linear Flow: When position (2) is reached, the peristaltic pump speed, or Flow (cc/min), is
controlled by the actuation of the foot pedal between zero and the maximum limit set by the user
using the UP or DOWN arrow keys or the default setting of the Flow parameter. The actual Flow
Rate display will show the position of the foot pedal from zero to the preset Flow Rate value on the
console.
Fixed Flow: The Fixed Flow Rate is set by the UP or DOWN arrow keys of the Flow (cc/min.)
parameter. Once the foot pedal reaches position (2), the Flow Rate will be equal to the preset
value.
Linear Vac: The user has the ability to hold the Vacuum by holding the foot pedal main treadle in
place. After a period in time, this will cause the peristaltic pump to cease, and a message will be
displayed on the screen stating that the “Pump has Stopped”. Fully depressing the foot pedal will
result in continuous Irrigation and Aspiration. Releasing the foot pedal will cease the Irrigation and
Aspiration functions.
Fixed Vac: The Vacuum (mmHg) UP or DOWN arrow soft-keys on the console set the Vacuum
value to a user-defined limit or default factory limit. The user cannot stop the Vacuum in foot pedal
position (2). The Vacuum will increase until the preset value is reached; the peristaltic pump will
stop and the “OCCLUSION” alarm will sound.
Single Cut: The Vitrectomy Single Cut Mode is activated by depressing the foot pedal to position
(2). When the main treadle reaches position (2), Irrigation and Aspiration are both activated along
with one (1) cut from the vitrectomy handpiece. Single Cut is normally used when there are just a
few Vitreous strands present in the anterior chamber of the eye. The doctor may choose to cut just
one strand at a time by depressing the foot pedal once for one (1) single cut.
Multi Cut: The Vitrectomy Multi Cut Mode is activated by depressing the foot pedal to position (2).
When the main treadle reaches position (2), Irrigation and Aspiration are both activated along with
the number of cuts per minute selected in the Cut Rate (cuts/min) display on the console screen.
The Cut Rate (cuts/min) range is from 60 to 700 cuts per minute in 10 cuts per minute increments
(i.e. 60, 70, 80, 90, 100 …700).
The Cut Rate will remain as selected (Single Cut/ Multi Cut) even with Linear Flow and/or
Linear Vac selected.
Reflux: The foot pedal has the Reflux (default) position on the “Right Side Kick Switch”. To
activate the Reflux function, press and hold the Right Side Kick Switch. The Reflux function may
have to be performed a few times depending on the occlusion.
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