LIGHT SOURCE & PARTS
This
ensures that cold light is passed to the instrument or endoscope since the heat
is left in the light source box
• Special
lamps such as quartz iodine, metal halide and xenon have been developed to give
a higher intensity of light of up to 500 Watts.
The
fiber light bundle is connected at one end to the light source and at the other
to the endoscope (Fig. above).
• It
contains a bundle of up to 20,000 flexible optical fibers which can conduct
light but not capable of carrying an image (E above).
• The
bundles transmit a prefocussed light of high intensity and uniform density to
the endoscope.
• The
bundle’s outer covering is metal and PVC, and is extremely flexible.
• In
addition, a separate set of upto 36,000 optical fibers capable of carrying an
image terminating proximally at an eyepiece, and distally at a lens at the end
of the endoscope (F above).
• Both
these sets of optical fibers are contained in a protective sheath of endoscope,
generally this sheath incorporates additional channels for:
a. Suction (G as shown above).
b. Gas inflation/irrigation (H as
shown above).
c. A passage for flexible biopsy or
operative forceps and electrodes (Fig. above).
d. Some special instruments used through this
port are shown in Figure above
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