passing position 2. The surgeon can select the following
settings in pulse mode:
– "Pulsed" mode: ultrasound is available both in panel
mode and in linear mode. Ultrasonic pulses are
generated, the pulse repetition rate can be adjusted
between 1 and 100Hz. For any frequency, it is possible to
adjust the duration of the active cycle (duty cycle) on
one of three levels (called "Standard", "Cold", "Ice cold"
and corresponding approximately to an active cycle of
50%, 25% and 10 % respectively), in order to limit the
ultrasound energy used to the minimum necessary.
– The 'HD pulse' mode automatically adapts the pulsed
duty cycle to the occlusion state of the tip, so as to
emulsify the 'captured' cataract fragments more quickly
from the tip without introducing unnecessary energy
when the tip is clear of occlusions.
– The Single burst mode provides single ultrasonic bursts
with a duration of 120 ms. The surgeon must return the
footswitch to zone C, pause for about ½ second, then
press it into zone C to obtain another single burst.
– The Multi burst mode generates ultrasounds with a
duration of 80 ms, with additional bursts generated
(about 1 burst per second) when the footswitch switches
from tactile position 2 and reaches zone C. When the
footswitch is pressed over the stop limit, the pulse
frequency increases up to the maximum speed of 4 bursts
per second.
– The Cont burst mode yields a pulse duration of 80 ms.
Once the foot switch has passed tactile position 2 and
reaches area C, the pulse are generated consecutively at
an increasing rate. At maximal depression of the foot
switch, the bursts blend together and the units delivers
continuous ultrasound power..
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