USER MANUAL (Instruction for Use) SW 6.1
Device / System Description
Version 6.1.6 dated 2020-01-31 EN Page 55 of 201
The label is placed inside the laser at the connection terminal.
IMPORTANT NOTE
The halogen filter has to be exchanged with every two changes of the premix
gas bottle. This is done by a SCHWIND Service technician or other trained
personnel only.
The used halogen filter contains toxic agents and should only be disposed of
in a professional way in accordance with directives of your location.
4.8 The Optical System
The optical system for beam guidance and forming is flanged and connected to the laser at its
output with a protective tube. The beam is turned four times at a 90 angle each time. Output of
the beam is perpendicular to the treatment area, coming down axially with the optical axis of the
video control system and of the fixation laser, which are used for centralization.
The treatment area is about 193 mm under the beam output housing. Focusing of the ablation
field and centring on the eye is performed with two positioning slit lights, a video camera and a
microscope. A video image with crosshair is produced on the monitor, which allows easy
centring of the pupil.
The maximum ablation field in the focus level has a diameter of max. 14.0 mm.
A fixation LED beams through the optical axis of the unit onto the eye and is used as a fixation
aiming point for the patient. The laser power is below 10 W, which allows prolonged
illumination of the eye without causing any damage.
Vacuuming of Optical Beam Delivery System
Radiation of an ArF excimer laser is 193 nm, which is at the outer limit of the ultra violet light
spectrum through which air is transmitted. Contact with air (oxygen) noticeably decreases the
radiation and ozone is produced. This would damage the optical components if it were allowed
to accumulate inside the delivery system.
For this reason, it is necessary to remove, or evacuate, the air from the beam path. The evacuation
process occurs automatically after switching on the system during the start-up phase.
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