Thursday, January 2, 2014

ENDOSCOPE 2 Parts & light source



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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