Welch Allyn ProXenon 350, Руководство пользователя

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2 Introduction Welch Allyn ProXenon 350 Surgical Illuminator
The control logic board controls lamp on/off, display, shutter and safety interlock functions.
The user interfaces with the control logic board by means of the front panel membrane
switch assembly.
Fans provide cooling to the lamp and power supply and are powered by the auxiliary
supply. ProXenon 350 uses parallel air flow design so that both power supply and fan are
cooled with ambient air.
The lamp module contains a custom 300W Xenon Cermax style lamp kernel with a large
anode design for improved lumen maintenance and an integral parabolic reflector. The
parabolic reflector collimates the light that is launched into a optical train. The optical train
contains:
• a shutter which controls total light intensity
• an optical filter which attenuates UV and IR radiation
• a condenser lens which focuses the light energy onto the face of fiberoptic cable
• a sensor which detects the presence of a fiberoptic cable allowing the shutter to open
When the main power switch is depressed, power is supplied to the fans and displays.
When the lamp on/off membrane switch is pressed, ignition pulses are directed to the
Xenon arc lamp. If the lamp fails to start, the ignition pulses time-out. If the lamp ignites,
the green LED indicator above the lamp on/off membrane switch illuminates. Pushing the
on/off membrane switch again turns the lamp off. It is normal to hear a “clicking” sound
as the igniter attempts to start the lamp.
When a fiberoptic cable is inserted into the active port of the turret, a sensor sends a
signal to the microprocessor allowing the shutter to open to the preset intensity setting.
When the fiber is removed, the shutter closes to full dim position attenuating all light
output. The intensity display shows the intensity setting as a continuous display when a
fiber is inserted and a flashing display when no fiber is present and the shutter is closed.
Headlight
The light is transmitted via total internal reflection through the fiberoptic cable to the
luminaire optics.
The luminaire optics consists of a two-element condenser lens assembly, a two-element
projector (objective) lens assembly, a mirror and an objective window. The light exiting the
face of the fiberoptic cable is collected by the condenser lens assembly and imaged
slightly forward of the projector lens. The iris is completely filled by the condenser lens
ray fans and is imaged by the projector lens 406mm from the projector window surface.
The illumination spot is approximately 120mm in diameter and yields about 800 lumens at
full iris opening with the light source at full open shutter.
A Brief Discussion about Light Intensity, Heat, Surgical Light Sources and
Surgical Headlights
It is sound practice to always use the lowest possible intensity setting required to achieve
good visualization. The ProXenon 350 Surgical Illuminator uses extremely restrictive UV
and IR filtering to virtually eliminate the transmission of non-visible light energy. More
than ninety-eight percent of all the radiant energy emitted from the ProXenon headlight
system is in the form of full-spectrum (white) visible light.
Heat from the lamp is not transmitted through the fiberoptic cable to the luminaire. The
perception of warmth caused by concentrated high intensity light is the result of the